International Journal of Mechanical Sciences最新文献_第4页

Transient thermal behaviour of a wet clutch using multi-body dynamics 基于多体动力学的湿式离合器瞬态热特性研究

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-02-06 DOI: 10.1016/j.ijmecsci.2026.111337

Zhiqiang Zhao , Heyun Bao , Zouhao Song , Fengxia Lu , Shanshan Liu

The pressure–temperature–time history is crucial for operating precision and service life of a wet clutch under high energy levels. However, there still lacks a simple and accurate model to predict the contact heat transfer at the sliding friction interface during the rotation-axial engagement process. In this paper, a transient thermal analysis of a multi-disc wet clutch is performed to capture the heat transfer behaviour of a sliding friction pair during the entire engagement cycle. The thermal conditions of the clutch are formulated by the dynamic model of a multi-body system considering the coupled effects of hydrodynamic lubrication, asperity contact, squeeze motion and sliding motion. The temperature characteristics of the clutch discs are investigated in detail by utilizing the thermal contact conductance under squeeze-sliding conditions. The peak temperatures of separator disc and friction lining are influenced by various applied pressures, material properties and load torques. As the applied pressure increases from 1.0 MPa to 1.6 MPa, the peak temperatures of the separator disc and friction lining are predicted to increase by 35.6% and 40.3%, respectively. When the load torque increases from 0 N m to 300 N m, the highest temperature of separator disc and friction lining increase by 16.3% and 15.8%, respectively. The developed thermal model could be a practicable toolkit for forecasting the temperature of a wet clutch under complex operating conditions.

压力-温度-时间历史对高能量水平下湿式离合器的操作精度和使用寿命至关重要。然而，目前还缺乏一种简单准确的模型来预测旋转-轴向接触过程中滑动摩擦界面处的接触换热。本文对多片湿离合器进行了瞬态热分析，以捕捉滑动摩擦副在整个接合周期中的传热行为。考虑流体动力润滑、粗糙接触、挤压运动和滑动运动的耦合效应，采用多体系统动力学模型建立了离合器的热工况。利用接触热导对离合器盘在挤压滑动条件下的温度特性进行了详细的研究。分离盘和摩擦衬的峰值温度受各种施加压力、材料性能和载荷扭矩的影响。当施加压力从1.0 MPa增加到1.6 MPa时，分离盘和摩擦衬的峰值温度分别升高35.6%和40.3%。负载转矩从0 N m增加到300 N m时，分离盘和摩擦衬的最高温度分别提高了16.3%和15.8%。所建立的热模型可作为预测复杂工况下湿式离合器温度的实用工具。

{"title":"Transient thermal behaviour of a wet clutch using multi-body dynamics","authors":"Zhiqiang Zhao , Heyun Bao , Zouhao Song , Fengxia Lu , Shanshan Liu","doi":"10.1016/j.ijmecsci.2026.111337","DOIUrl":"10.1016/j.ijmecsci.2026.111337","url":null,"abstract":"<div><div>The pressure–temperature–time history is crucial for operating precision and service life of a wet clutch under high energy levels. However, there still lacks a simple and accurate model to predict the contact heat transfer at the sliding friction interface during the rotation-axial engagement process. In this paper, a transient thermal analysis of a multi-disc wet clutch is performed to capture the heat transfer behaviour of a sliding friction pair during the entire engagement cycle. The thermal conditions of the clutch are formulated by the dynamic model of a multi-body system considering the coupled effects of hydrodynamic lubrication, asperity contact, squeeze motion and sliding motion. The temperature characteristics of the clutch discs are investigated in detail by utilizing the thermal contact conductance under squeeze-sliding conditions. The peak temperatures of separator disc and friction lining are influenced by various applied pressures, material properties and load torques. As the applied pressure increases from 1.0 MPa to 1.6 MPa, the peak temperatures of the separator disc and friction lining are predicted to increase by 35.6% and 40.3%, respectively. When the load torque increases from 0 N m to 300 N m, the highest temperature of separator disc and friction lining increase by 16.3% and 15.8%, respectively. The developed thermal model could be a practicable toolkit for forecasting the temperature of a wet clutch under complex operating conditions.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"314 ","pages":"Article 111337"},"PeriodicalIF":9.4,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hybrid Kresling origami metamaterial for low-frequency longitudinal waves 低频纵波混合Kresling折纸超材料

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-02-05 DOI: 10.1016/j.ijmecsci.2026.111359

Chenyi Bu , Xiang Fang , Xiaoxuan Wang , Kai Wang , Sixing Xiong , Huimin Wu , Jin Qian

Origami and kirigami offer a distinct alternative to conventional vibration mitigation strategies, demonstrating superior adaptability and tunability under varying dynamic conditions. However, they are still confronted with several challenges in practical applications, including insufficient durability, difficulties in scalable manufacturing, and limited vibration suppression performance in the low-frequency range. In this work, we proposed a novel one-dimensional metamaterial based on Kresling origami, which combines exceptional durability with suitability for scalable manufacturing. The structure incorporates origami-derived elastic struts and local resonant masses positioned at both ends of the creases, forming a unit cell that integrates the axial-torsional coupling characteristics of Kresling origami with the principle of local resonance. Through systematic finite element simulations, we investigate the band structures and wave attenuation capabilities of the proposed Kresling origami metamaterial. Our results indicate that low-frequency longitudinal bandgaps can be effectively tuned by key geometric parameters, including the added resonant mass and the geometries of the Kresling origami. Samples were fabricated using selective laser melting (SLM) with AlSi10Mg alloy. Further vibration experiments showed close agreement with simulation results, accurately capturing both the spectral locations and widths of the bandgaps. Various parameter configurations demonstrated tunable performance for broadband wave attenuation. This study enriches the design methodology for origami-inspired metamaterials and provides theoretical guidance for structural engineering applications, including vibration isolation, noise reduction, and impact mitigation, paving the way for multifunctional and programable structures of next-generation.

折纸和kirigami为传统的减振策略提供了独特的选择，在不同的动态条件下表现出卓越的适应性和可调性。然而，它们在实际应用中仍然面临着一些挑战，包括耐久性不足、难以规模化制造以及低频范围内的抑制振动性能有限。在这项工作中，我们提出了一种基于Kresling折纸的新型一维超材料，它结合了卓越的耐用性和可扩展制造的适用性。该结构将折纸衍生弹性杆和位于折痕两端的局部共振质量结合在一起，形成了一个将Kresling折纸的轴扭耦合特性与局部共振原理相结合的单元格。通过系统的有限元模拟，我们研究了所提出的Kresling折纸超材料的能带结构和波衰减能力。我们的研究结果表明，低频纵向带隙可以通过关键的几何参数有效地调谐，包括增加的共振质量和Kresling折纸的几何形状。采用选择性激光熔化（SLM）法制备了AlSi10Mg合金样品。进一步的振动实验结果与仿真结果非常吻合，准确地捕获了带隙的光谱位置和宽度。各种参数配置显示了宽带波衰减的可调性能。该研究丰富了折纸启发的超材料的设计方法，并为结构工程应用提供了理论指导，包括隔振、降噪和减轻冲击，为下一代多功能和可编程结构铺平了道路。

{"title":"Hybrid Kresling origami metamaterial for low-frequency longitudinal waves","authors":"Chenyi Bu , Xiang Fang , Xiaoxuan Wang , Kai Wang , Sixing Xiong , Huimin Wu , Jin Qian","doi":"10.1016/j.ijmecsci.2026.111359","DOIUrl":"10.1016/j.ijmecsci.2026.111359","url":null,"abstract":"<div><div>Origami and kirigami offer a distinct alternative to conventional vibration mitigation strategies, demonstrating superior adaptability and tunability under varying dynamic conditions. However, they are still confronted with several challenges in practical applications, including insufficient durability, difficulties in scalable manufacturing, and limited vibration suppression performance in the low-frequency range. In this work, we proposed a novel one-dimensional metamaterial based on Kresling origami, which combines exceptional durability with suitability for scalable manufacturing. The structure incorporates origami-derived elastic struts and local resonant masses positioned at both ends of the creases, forming a unit cell that integrates the axial-torsional coupling characteristics of Kresling origami with the principle of local resonance. Through systematic finite element simulations, we investigate the band structures and wave attenuation capabilities of the proposed Kresling origami metamaterial. Our results indicate that low-frequency longitudinal bandgaps can be effectively tuned by key geometric parameters, including the added resonant mass and the geometries of the Kresling origami. Samples were fabricated using selective laser melting (SLM) with AlSi10Mg alloy. Further vibration experiments showed close agreement with simulation results, accurately capturing both the spectral locations and widths of the bandgaps. Various parameter configurations demonstrated tunable performance for broadband wave attenuation. This study enriches the design methodology for origami-inspired metamaterials and provides theoretical guidance for structural engineering applications, including vibration isolation, noise reduction, and impact mitigation, paving the way for multifunctional and programable structures of next-generation.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"314 ","pages":"Article 111359"},"PeriodicalIF":9.4,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lightweight-simplified electromagnetic energy harvesting backpack with gait recognition function 具有步态识别功能的轻型电磁能量收集背包

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-02-05 DOI: 10.1016/j.ijmecsci.2026.111356

Feng Zhong, Baoyu Sun, Jieqiong Lin

Energy harvesting backpack (EHB) is a self-powered device with sustainable input, but traditional EHB currently faces obstacles such as heavy loads, cumbersome components, and limited functionality. Therefore, this paper proposes a lightweight-simplified electromagnetic energy harvesting backpack (LS-EEHB) with gait recognition function. According to the system theoretical analysis of the energy backpack, the relationship between human motion input and prototype output has been established, along with finding the key factors influencing output performance. Then, the rationality and effectiveness of the established model is verified through simulations and experiments. Under the optimal configuration parameters, when the speed is 12 km/h and nonlinear effect is introduced, the prototype can achieve a maximum output power of 477.96 mW, which is 2.4 times that of when nonlinear effect is not introduced. In application experiments, the prototype is capable of charging a mobile phone, lighting high-power LEDs, and achieving positioning and trajectory tracking. In addition, during sensing test, the LSTM model exhibits the higher recognition accuracy and better adaptability in human gait recognition. The recognition accuracy reached 98.3%, demonstrating the prototype's outstanding sensing performance. This article proposes a new concept for energy backpacks that is lightweight, simplified, and multifunctional.

能量收集背包（EHB）是一种具有可持续输入的自供电设备，但传统的EHB目前面临着诸如重载、笨重的组件和有限的功能等障碍。因此，本文提出了一种具有步态识别功能的轻量化简化电磁能量收集背包（LS-EEHB）。通过对能量背包的系统理论分析，建立了人体运动输入与样机输出之间的关系，找到了影响输出性能的关键因素。然后，通过仿真和实验验证了所建立模型的合理性和有效性。在最优配置参数下，当车速为12 km/h且引入非线性效应时，样机最大输出功率为477.96 mW，是不引入非线性效应时的2.4倍。在应用实验中，原型机能够为手机充电，点亮大功率led，并实现定位和轨迹跟踪。此外，在感知测试中，LSTM模型在人体步态识别中表现出更高的识别精度和更好的适应性。识别精度达到98.3%，显示了原型机出色的传感性能。本文提出了一种轻量、简化、多功能的能量背包新概念。

{"title":"Lightweight-simplified electromagnetic energy harvesting backpack with gait recognition function","authors":"Feng Zhong, Baoyu Sun, Jieqiong Lin","doi":"10.1016/j.ijmecsci.2026.111356","DOIUrl":"10.1016/j.ijmecsci.2026.111356","url":null,"abstract":"<div><div>Energy harvesting backpack (EHB) is a self-powered device with sustainable input, but traditional EHB currently faces obstacles such as heavy loads, cumbersome components, and limited functionality. Therefore, this paper proposes a lightweight-simplified electromagnetic energy harvesting backpack (LS-EEHB) with gait recognition function. According to the system theoretical analysis of the energy backpack, the relationship between human motion input and prototype output has been established, along with finding the key factors influencing output performance. Then, the rationality and effectiveness of the established model is verified through simulations and experiments. Under the optimal configuration parameters, when the speed is 12 km/h and nonlinear effect is introduced, the prototype can achieve a maximum output power of 477.96 mW, which is 2.4 times that of when nonlinear effect is not introduced. In application experiments, the prototype is capable of charging a mobile phone, lighting high-power LEDs, and achieving positioning and trajectory tracking. In addition, during sensing test, the LSTM model exhibits the higher recognition accuracy and better adaptability in human gait recognition. The recognition accuracy reached 98.3%, demonstrating the prototype's outstanding sensing performance. This article proposes a new concept for energy backpacks that is lightweight, simplified, and multifunctional.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"313 ","pages":"Article 111356"},"PeriodicalIF":9.4,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Domain-decomposed spectral-ritz framework for 3D elastic dynamics of polyhedral structures 多面体结构三维弹性动力学的域分解谱-里兹框架

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-02-05 DOI: 10.1016/j.ijmecsci.2026.111326

Xiaochao Chen, Chengcheng Chang, Lin Cheng, Runbin Li

In this study, a domain-decomposed spectral-Ritz framework is proposed for the high-fidelity analysis of three-dimensional elastic structures with polyhedral geometries and generalized boundary conditions. The global domain is partitioned into a small number of non-overlapping polyhedral subdomains, each independently mapped to a standard unit cube through trilinear transformation. Within each subdomain, displacement fields are approximated using global Jacobi polynomial-based spectral expansions, and the governing equations are derived from three-dimensional elasticity via the Ritz variational principle. The key contribution of this work is the systematic extension of the spectral–Ritz method to a domain-decomposed three-dimensional elastic framework applicable to complex polyhedral geometries. Unlike existing spectral formulations that are largely restricted to single, regular domains or lower-dimensional structural models, the proposed approach enables multiple heterogeneous subdomains—each with independent geometric mappings and spectral approximations—to be consistently assembled within a unified variational setting. Generalized boundary and interfacial constraints are incorporated at the energy level through weak enforcement strategies, allowing the resulting formulation to retain spectral accuracy while achieving geometric and topological flexibility. The effectiveness of presented method is demonstrated through free vibration, forced response, and transient dynamic analyses, complemented by finite element and experimental modal validation. The results confirm that the proposed framework achieves high accuracy with significantly reduced degrees of freedom, making it well suited for complex three-dimensional structural dynamics problems.

本文提出了一种适用于具有多面体几何形状和广义边界条件的三维弹性结构高保真分析的域分解谱-里兹框架。将全局域划分为少量不重叠的多面体子域，每个子域通过三线性变换独立映射到一个标准的单位立方体。在每个子域中，利用基于全局Jacobi多项式的谱展开近似求解位移场，并利用Ritz变分原理从三维弹性中推导出控制方程。这项工作的关键贡献是将谱-里兹方法系统地扩展到适用于复杂多面体几何的域分解三维弹性框架。与现有的主要局限于单一规则域或低维结构模型的光谱公式不同，该方法使多个异构子域（每个子域具有独立的几何映射和光谱近似）能够在统一的变分设置中一致地组装。通过弱执行策略，将广义边界和界面约束纳入能量级别，从而使所得公式在保持光谱精度的同时实现几何和拓扑灵活性。通过自由振动、强迫响应和瞬态动力分析，并辅以有限元和实验模态验证，证明了该方法的有效性。结果表明，所提出的框架在显著降低自由度的情况下获得了较高的精度，使其非常适合复杂的三维结构动力学问题。

{"title":"Domain-decomposed spectral-ritz framework for 3D elastic dynamics of polyhedral structures","authors":"Xiaochao Chen, Chengcheng Chang, Lin Cheng, Runbin Li","doi":"10.1016/j.ijmecsci.2026.111326","DOIUrl":"10.1016/j.ijmecsci.2026.111326","url":null,"abstract":"<div><div>In this study, a domain-decomposed spectral-Ritz framework is proposed for the high-fidelity analysis of three-dimensional elastic structures with polyhedral geometries and generalized boundary conditions. The global domain is partitioned into a small number of non-overlapping polyhedral subdomains, each independently mapped to a standard unit cube through trilinear transformation. Within each subdomain, displacement fields are approximated using global Jacobi polynomial-based spectral expansions, and the governing equations are derived from three-dimensional elasticity via the Ritz variational principle. The key contribution of this work is the systematic extension of the spectral–Ritz method to a domain-decomposed three-dimensional elastic framework applicable to complex polyhedral geometries. Unlike existing spectral formulations that are largely restricted to single, regular domains or lower-dimensional structural models, the proposed approach enables multiple heterogeneous subdomains—each with independent geometric mappings and spectral approximations—to be consistently assembled within a unified variational setting. Generalized boundary and interfacial constraints are incorporated at the energy level through weak enforcement strategies, allowing the resulting formulation to retain spectral accuracy while achieving geometric and topological flexibility. The effectiveness of presented method is demonstrated through free vibration, forced response, and transient dynamic analyses, complemented by finite element and experimental modal validation. The results confirm that the proposed framework achieves high accuracy with significantly reduced degrees of freedom, making it well suited for complex three-dimensional structural dynamics problems.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"313 ","pages":"Article 111326"},"PeriodicalIF":9.4,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modelling framework for wheel–rail contact temperature evolution during braking 制动过程轮轨接触温度演变的建模框架

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-02-05 DOI: 10.1016/j.ijmecsci.2026.111345

Yifan Yang , Qiuyong Tian , Claudio Colao , Shiqian Chen , Kaiyun Wang , Markus Hecht

Excessive frictional heat generated at the wheel–rail (WR) interface during braking is a primary cause of thermally induced damage and remains a persistent challenge for railway maintenance and safety. This study presents a comprehensive framework for simulating the evolution of WR contact temperature. The approach integrates: (i) a three-dimensional wagon–track interaction model that captures dynamic axle load transfer, (ii) an elastoplastic contact finite element (FE) model with a refined stress reconstruction method, (iii) a novel formulation for the temperature-dependent friction coefficient, and (iv) a pressure-dependent thermal conductance that effectively eliminates numerical singularities. These elements are integrated with a high-efficiency thermal FE model, whose accuracy and physical reliability are validated through comparisons with a transient thermomechanical FE model and field-observed damage patterns. The results reveal a strong positive correlation between creepage and maximum wheel temperature, a highly nonlinear temperature increase during wheel lock-up, and thermal asymmetry during cooling due to enhanced heat conduction on the flange side. The proposed framework can serve as an efficient and extensible tool for wheel thermal response analysis during braking, providing a reliable basis for braking performance evaluation and thermal damage prevention.

制动过程中轮轨界面产生的过多摩擦热是热致损伤的主要原因，也是铁路维护和安全的长期挑战。本研究提出了一个全面的框架来模拟WR接触温度的演变。该方法集成了：(i)捕获动态轴载传递的三维货车-轨道相互作用模型，（ii）具有精细应力重建方法的弹塑性接触有限元（FE）模型，（iii）温度相关摩擦系数的新公式，以及（iv）有效消除数值奇点的压力相关热导。这些元素与高效的热有限元模型相结合，通过与瞬态热力学有限元模型和现场观察的损伤模式的比较，验证了其准确性和物理可靠性。结果表明，漏电与车轮最高温度、车轮闭锁期间的高度非线性温度升高以及由于凸缘侧热传导增强而导致的冷却过程中的热不对称性之间存在很强的正相关关系。该框架可作为一种高效、可扩展的制动过程车轮热响应分析工具，为制动性能评价和热损伤预防提供可靠依据。

{"title":"Modelling framework for wheel–rail contact temperature evolution during braking","authors":"Yifan Yang , Qiuyong Tian , Claudio Colao , Shiqian Chen , Kaiyun Wang , Markus Hecht","doi":"10.1016/j.ijmecsci.2026.111345","DOIUrl":"10.1016/j.ijmecsci.2026.111345","url":null,"abstract":"<div><div>Excessive frictional heat generated at the wheel–rail (WR) interface during braking is a primary cause of thermally induced damage and remains a persistent challenge for railway maintenance and safety. This study presents a comprehensive framework for simulating the evolution of WR contact temperature. The approach integrates: (i) a three-dimensional wagon–track interaction model that captures dynamic axle load transfer, (ii) an elastoplastic contact finite element (FE) model with a refined stress reconstruction method, (iii) a novel formulation for the temperature-dependent friction coefficient, and (iv) a pressure-dependent thermal conductance that effectively eliminates numerical singularities. These elements are integrated with a high-efficiency thermal FE model, whose accuracy and physical reliability are validated through comparisons with a transient thermomechanical FE model and field-observed damage patterns. The results reveal a strong positive correlation between creepage and maximum wheel temperature, a highly nonlinear temperature increase during wheel lock-up, and thermal asymmetry during cooling due to enhanced heat conduction on the flange side. The proposed framework can serve as an efficient and extensible tool for wheel thermal response analysis during braking, providing a reliable basis for braking performance evaluation and thermal damage prevention.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"314 ","pages":"Article 111345"},"PeriodicalIF":9.4,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A dynamic eigencurve-based method for modeling and application of a multi-ring resonator 基于动态特征曲线的多环谐振器建模方法及应用

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-02-05 DOI: 10.1016/j.ijmecsci.2026.111348

Yixuan Li , Chen Lin , Bo Jiang , Pu Chen , Shenhu Huang , Yi Zhou , Yan Su

Constructing a stiffness–mass model for the multi-ring resonator (MRR) is vital to the performance analysis of disk resonator gyroscopes (DRGs). However, FEM is computationally expensive, while existing analytical methods involve intricate derivations without traceable parameter–property correlations. This study first proposes a dynamic eigencurve to characterize the intrinsic effective stiffness/mass distribution pattern of the multi-ring bending mode, thus enabling the development of a fast and accurate dynamic modeling method. The eigencurve is obtained by normalizing the effective stiffness/mass contributed by each component of the MRR as well as their geometric positions, and exhibits remarkable consistency across different designs. Upon incorporation of the structural parameters into the normalization factor functions developed via goodness-of-fit analysis and linear superposition of dynamic variables, the eigencurve denormalized by these factors can be rapidly converted into the effective stiffness/mass distribution curve for a given MRR configuration. By integrating this denormalized curve, an explicit mapping model between the multi-ring structure and its dynamic properties is systematically derived. The proposed model deviates by less than 10.6% from FEM results with extremely high computational efficiency. Furthermore, a PSO algorithm based on this model is applied to optimize MRR modal distribution, revealing that an anchor-to-outer radius ratio exceeding 0.69 is essential to achieve a low operational mode frequency with large separation from interference modes. This study provides a simple and effective analytical framework for typical multi-ring architectures, facilitating the extension of modeling methodologies to complex multi-ring variants, and also offers optimization strategies for the design of high-performance DRG.

建立多环谐振器的刚度-质量模型对盘腔陀螺仪的性能分析至关重要。然而，有限元法的计算成本很高，而现有的分析方法涉及复杂的推导，没有可追溯的参数-性质相关性。本研究首先提出了一种动态特征曲线来表征多环弯曲模态固有的有效刚度/质量分布模式，从而建立了一种快速准确的动态建模方法。该特征曲线通过对MRR各组成部分及其几何位置贡献的有效刚度/质量进行归一化得到，并在不同设计中表现出显著的一致性。将结构参数纳入通过拟合优度分析和动态变量线性叠加得到的归一化因子函数中，通过这些因素进行非归一化的特征曲线可以快速转化为给定MRR构型的有效刚度/质量分布曲线。通过对这条非规格化曲线的积分，系统地导出了多环结构与其动力特性之间的显式映射模型。该模型与有限元计算结果偏差小于10.6%，计算效率极高。利用基于该模型的粒子群算法对MRR模态分布进行了优化，结果表明，要实现低工作模态频率，且与干扰模态有较大距离，锚点与外半径比必须大于0.69。本研究为典型的多环结构提供了一个简单有效的分析框架，促进了建模方法向复杂多环变体的扩展，并为高性能DRG的设计提供了优化策略。

{"title":"A dynamic eigencurve-based method for modeling and application of a multi-ring resonator","authors":"Yixuan Li , Chen Lin , Bo Jiang , Pu Chen , Shenhu Huang , Yi Zhou , Yan Su","doi":"10.1016/j.ijmecsci.2026.111348","DOIUrl":"10.1016/j.ijmecsci.2026.111348","url":null,"abstract":"<div><div>Constructing a stiffness–mass model for the multi-ring resonator (MRR) is vital to the performance analysis of disk resonator gyroscopes (DRGs). However, FEM is computationally expensive, while existing analytical methods involve intricate derivations without traceable parameter–property correlations. This study first proposes a dynamic eigencurve to characterize the intrinsic effective stiffness/mass distribution pattern of the multi-ring bending mode, thus enabling the development of a fast and accurate dynamic modeling method. The eigencurve is obtained by normalizing the effective stiffness/mass contributed by each component of the MRR as well as their geometric positions, and exhibits remarkable consistency across different designs. Upon incorporation of the structural parameters into the normalization factor functions developed via goodness-of-fit analysis and linear superposition of dynamic variables, the eigencurve denormalized by these factors can be rapidly converted into the effective stiffness/mass distribution curve for a given MRR configuration. By integrating this denormalized curve, an explicit mapping model between the multi-ring structure and its dynamic properties is systematically derived. The proposed model deviates by less than 10.6% from FEM results with extremely high computational efficiency. Furthermore, a PSO algorithm based on this model is applied to optimize MRR modal distribution, revealing that an anchor-to-outer radius ratio exceeding 0.69 is essential to achieve a low operational mode frequency with large separation from interference modes. This study provides a simple and effective analytical framework for typical multi-ring architectures, facilitating the extension of modeling methodologies to complex multi-ring variants, and also offers optimization strategies for the design of high-performance DRG.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"313 ","pages":"Article 111348"},"PeriodicalIF":9.4,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-stage uncertainty quantification framework for red blood cell morpho-mechanics 红细胞形态力学的多阶段不确定度定量框架

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-02-04 DOI: 10.1016/j.ijmecsci.2026.111352

Shuo Wang , Lei Ma , Ling Guo , Xuejin Li , Tao Zhou

Characterizing the morpho-mechanical properties of red blood cells (RBCs) is essential for understanding microvascular transport and cellular pathophysiology. However, computational models in this field are often limited by multi-source uncertainties including inconsistencies across experimental platforms and stochasticity in parameter identification. To address these challenges, a novel multi-stage uncertainty quantification framework specifically designed for RBCs, termed RBC-MsUQ, is presented. This framework integrates hierarchical Bayesian inference with diverse experimental datasets, with prior parameter distributions being established from microscopic simulations and existing literature. A dynamic annealing technique is employed to ensure accurate stress-free reference states, while deep neural network surrogates, optimized through sensitivity analysis, achieve prediction errors below 10⁻² for efficient simulation approximation. In its two-stage inference architecture, geometric and shear modulus parameters are first constrained using equilibrium and stretching data (Stage I), after which the full set of viscoelastic parameters is identified through membrane fluctuation and relaxation tests (Stage II). When applied to both healthy and malaria-infected RBCs, statistically robust posterior distributions are produced, revealing increased stiffness and membrane viscosity in diseased cells. Quantitative validation confirms that uncertainties are effectively reduced through cross-platform data fusion, thereby overcoming key limitations of current computational approaches. Thus, a systematic and extensible paradigm for advancing RBC biomechanics and its biomedical applications is established by the RBC-MsUQ framework.

表征红细胞（rbc）的形态力学特性对于理解微血管运输和细胞病理生理至关重要。然而，该领域的计算模型往往受到多源不确定性的限制，包括实验平台之间的不一致性和参数识别的随机性。为了应对这些挑战，提出了一种专门为红细胞设计的新型多阶段不确定性量化框架，称为RBC-MsUQ。该框架将层次贝叶斯推理与不同的实验数据集相结合，并从微观模拟和现有文献中建立先验参数分布。采用动态退火技术确保准确的无应力参考状态，而通过灵敏度分析优化的深度神经网络替代物的预测误差低于10−2，以实现有效的模拟近似。在其两阶段推理架构中，首先使用平衡和拉伸数据对几何和剪切模量参数进行约束（阶段1），然后通过膜波动和松弛试验（阶段2）确定全套粘弹性参数。当应用于健康和疟疾感染的红细胞时，产生统计上稳健的后验分布，显示患病细胞的刚度和膜粘度增加。定量验证证实，通过跨平台数据融合有效地减少了不确定性，从而克服了当前计算方法的关键局限性。因此，红细胞- msuq框架为推进红细胞生物力学及其生物医学应用建立了一个系统和可扩展的范例。

{"title":"Multi-stage uncertainty quantification framework for red blood cell morpho-mechanics","authors":"Shuo Wang , Lei Ma , Ling Guo , Xuejin Li , Tao Zhou","doi":"10.1016/j.ijmecsci.2026.111352","DOIUrl":"10.1016/j.ijmecsci.2026.111352","url":null,"abstract":"<div><div>Characterizing the morpho-mechanical properties of red blood cells (RBCs) is essential for understanding microvascular transport and cellular pathophysiology. However, computational models in this field are often limited by multi-source uncertainties including inconsistencies across experimental platforms and stochasticity in parameter identification. To address these challenges, a novel multi-stage uncertainty quantification framework specifically designed for RBCs, termed RBC-MsUQ, is presented. This framework integrates hierarchical Bayesian inference with diverse experimental datasets, with prior parameter distributions being established from microscopic simulations and existing literature. A dynamic annealing technique is employed to ensure accurate stress-free reference states, while deep neural network surrogates, optimized through sensitivity analysis, achieve prediction errors below 10<sup>−2</sup> for efficient simulation approximation. In its two-stage inference architecture, geometric and shear modulus parameters are first constrained using equilibrium and stretching data (Stage I), after which the full set of viscoelastic parameters is identified through membrane fluctuation and relaxation tests (Stage II). When applied to both healthy and malaria-infected RBCs, statistically robust posterior distributions are produced, revealing increased stiffness and membrane viscosity in diseased cells. Quantitative validation confirms that uncertainties are effectively reduced through cross-platform data fusion, thereby overcoming key limitations of current computational approaches. Thus, a systematic and extensible paradigm for advancing RBC biomechanics and its biomedical applications is established by the RBC-MsUQ framework.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"313 ","pages":"Article 111352"},"PeriodicalIF":9.4,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deep-learning-driven modeling of oxygen influence on graphene oxide elastic modulus 氧对氧化石墨烯弹性模量影响的深度学习驱动建模

IF 7.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-02-04 DOI: 10.1016/j.ijmecsci.2026.111354

Yuqin Xiao, Yuxin Yan, Sivakumar Manickam, Haitao Zhao, Tao Wu, Cheng Heng Pang

引用次数: 0

Electrochemically Stable Artificial Muscles from Directly Spun Carbon Nanotube Fibers 直接纺碳纳米管纤维制备的电化学稳定人造肌肉

IF 7.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-02-04 DOI: 10.1016/j.ijmecsci.2026.111342

Chae-Lin Park, Byeonghwa Goh, Seongjae Oh, Jae Won Lee, Won Yong Seo, Young-Chul Song, Hyun Kim, Seung Hwan Ko, Changsoon Choi, Seon Jeong Kim, MinGook Han, Taewan Lim, Sukjoon Hong, Xinghao Hu, Joonmyung Choi, Hyeon Su Jeong, Shi Hyeong Kim

引用次数: 0

Ultimate tensile strength of atomic layer deposited Al2O3 nanofilms 原子层沉积Al2O3纳米膜的极限拉伸强度

IF 9.4 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences

Pub Date : 2026-02-04 DOI: 10.1016/j.ijmecsci.2026.111355

Kia Dastani , Mohammad R. Movahhedy , Saeed Khodaygan , Micheal Yu Wang , Hongyu Yu

The fracture properties of atomic layer deposited (ALD) Al₂O₃ remain poorly studied despite their growing importance in multifunctional nanolattices and nanoscale devices. Only a few studies have reported the ultimate tensile strength of ALD Al₂O₃, with values ranging widely from 0.43 to 4.2 GPa, making it difficult to identify a representative value. To address this research gap, the present study focuses on the fracture strength of ALD Al₂O₃. Specifically, we fabricated circular free‑standing Al₂O₃ nanofilms with thicknesses of 50 nm and 100 nm, deposited at 200 °C and 300 °C, and subjected them to deflection using a conospherical nanoindentation tip until fracture. This experimental approach has not been previously reported for mechanical characterization of thin films. The ultimate tensile strength estimated in the present work is significantly higher than values reported in prior studies. This discrepancy is primarily attributed to inadequate stress analysis in earlier works, as explained in detail in the manuscript. Furthermore, the applicability and validity of the present results are carefully examined and discussed.

尽管原子层沉积（ALD） Al2O3在多功能纳米晶格和纳米级器件中越来越重要，但对其断裂性能的研究仍然很少。只有少数研究报道了ALD Al2O3的极限抗拉强度，其值范围从0.43到4.2 GPa，很难确定一个具有代表性的值。为了解决这一研究空白，本研究将重点放在ALD Al2O3的断裂强度上。具体来说，我们制作了厚度为50 nm和100 nm的圆形独立Al2O3纳米膜，分别在200°C和300°C下沉积，并使用锥形纳米压痕尖端使其偏转直至断裂。这种实验方法以前没有报道过薄膜的机械特性。本研究估计的极限抗拉强度明显高于先前研究报告的值。这种差异主要是由于早期工作中的应力分析不足，如手稿中详细解释的那样。此外，本文还对所得结果的适用性和有效性进行了仔细的检验和讨论。

{"title":"Ultimate tensile strength of atomic layer deposited Al2O3 nanofilms","authors":"Kia Dastani , Mohammad R. Movahhedy , Saeed Khodaygan , Micheal Yu Wang , Hongyu Yu","doi":"10.1016/j.ijmecsci.2026.111355","DOIUrl":"10.1016/j.ijmecsci.2026.111355","url":null,"abstract":"<div><div>The fracture properties of atomic layer deposited (ALD) Al<sub>2</sub>O<sub>3</sub> remain poorly studied despite their growing importance in multifunctional nanolattices and nanoscale devices. Only a few studies have reported the ultimate tensile strength of ALD Al<sub>2</sub>O<sub>3</sub>, with values ranging widely from 0.43 to 4.2 GPa, making it difficult to identify a representative value. To address this research gap, the present study focuses on the fracture strength of ALD Al<sub>2</sub>O<sub>3</sub>. Specifically, we fabricated circular free‑standing Al<sub>2</sub>O<sub>3</sub> nanofilms with thicknesses of 50 nm and 100 nm, deposited at 200 °C and 300 °C, and subjected them to deflection using a conospherical nanoindentation tip until fracture. This experimental approach has not been previously reported for mechanical characterization of thin films. The ultimate tensile strength estimated in the present work is significantly higher than values reported in prior studies. This discrepancy is primarily attributed to inadequate stress analysis in earlier works, as explained in detail in the manuscript. Furthermore, the applicability and validity of the present results are carefully examined and discussed.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"314 ","pages":"Article 111355"},"PeriodicalIF":9.4,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0