Pub Date : 2024-09-18DOI: 10.1177/10775463241280997
Hernán Garrido, Martín Domizio, Oscar Curadelli, Daniel Ambrosini
The building mass damper (BMD) is a design concept in which a structure is substructured in such a way that the upper substructure behaves as a large-mass tuned mass damper for the lower one. Its correct tuning usually requires softening (partial isolating) the upper substructure, which limits its application for retrofitting. The recently proposed inerter-based building mass damper (IBMD) solves, reasonably, the softening dynamically through the use of an inerter. This implies an in parallel intervention, which drastically simplifies the practicability of the BMD for retrofitting. The present paper involves comprehensive numerical simulations for multi-objective optimization of an IBMD, accounting for inherent structural damping. In particular, the deformation of the upper substructure is an additional objective function, besides the deformation of the lower substructure as considered in a previous work. Results demonstrate that the IBMD outperforms various benchmark interventions, including dampers, stiffeners, softening devices, and inerters without dampers. Additionally, it was found that the inherent structural damping partially replaces the need for additional damping. Finally, it was also shown that emphasizing the optimization of the lower substructure deformation enhances the overall structural safety in most cases. Nevertheless, the multi-objective optimization increases the versatility of the design concept in the case of substructures with different allowable deformations.
{"title":"Multi-objective optimization of inerter-based building mass dampers","authors":"Hernán Garrido, Martín Domizio, Oscar Curadelli, Daniel Ambrosini","doi":"10.1177/10775463241280997","DOIUrl":"https://doi.org/10.1177/10775463241280997","url":null,"abstract":"The building mass damper (BMD) is a design concept in which a structure is substructured in such a way that the upper substructure behaves as a large-mass tuned mass damper for the lower one. Its correct tuning usually requires softening (partial isolating) the upper substructure, which limits its application for retrofitting. The recently proposed inerter-based building mass damper (IBMD) solves, reasonably, the softening dynamically through the use of an inerter. This implies an in parallel intervention, which drastically simplifies the practicability of the BMD for retrofitting. The present paper involves comprehensive numerical simulations for multi-objective optimization of an IBMD, accounting for inherent structural damping. In particular, the deformation of the upper substructure is an additional objective function, besides the deformation of the lower substructure as considered in a previous work. Results demonstrate that the IBMD outperforms various benchmark interventions, including dampers, stiffeners, softening devices, and inerters without dampers. Additionally, it was found that the inherent structural damping partially replaces the need for additional damping. Finally, it was also shown that emphasizing the optimization of the lower substructure deformation enhances the overall structural safety in most cases. Nevertheless, the multi-objective optimization increases the versatility of the design concept in the case of substructures with different allowable deformations.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-18DOI: 10.1177/10775463241284432
Mohammadreza Shokrollahi, Mohsen Tamaddon
A fast and highly accurate mathematical sound source localization (SSL) algorithm is presented to locate the sound source. Although the concept is based on the time difference of arrival (TDOA) method, the SSL is accomplished, without the need to perform complex calculations and heavy processing. The proposed idea is examined in a simple three- and four-microphone array for detection in two-dimensional (2-D) media. The concept is developed to a five-microphone array to evaluate the applicability of the idea in a 3-D space. As a TDOA method, reading out the time delays is accompanied with the errors in real applications. To further suppress the adverse effects, a seven-microphone array is investigated to cover a whole 3-D space with the least error. Compared with the conventional methods, by decreasing the calculation complexities, the proposed approach alleviates the hardware costs and the processing time, making it a proper choice for many SSL applications.
{"title":"A low-complexity highly accurate sound source localization algorithm based on sound sensor arrays","authors":"Mohammadreza Shokrollahi, Mohsen Tamaddon","doi":"10.1177/10775463241284432","DOIUrl":"https://doi.org/10.1177/10775463241284432","url":null,"abstract":"A fast and highly accurate mathematical sound source localization (SSL) algorithm is presented to locate the sound source. Although the concept is based on the time difference of arrival (TDOA) method, the SSL is accomplished, without the need to perform complex calculations and heavy processing. The proposed idea is examined in a simple three- and four-microphone array for detection in two-dimensional (2-D) media. The concept is developed to a five-microphone array to evaluate the applicability of the idea in a 3-D space. As a TDOA method, reading out the time delays is accompanied with the errors in real applications. To further suppress the adverse effects, a seven-microphone array is investigated to cover a whole 3-D space with the least error. Compared with the conventional methods, by decreasing the calculation complexities, the proposed approach alleviates the hardware costs and the processing time, making it a proper choice for many SSL applications.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-18DOI: 10.1177/10775463241278642
Yuan Tang, PeiLiang Bian, Hai Qing
In this work, the influence of elastic foundation on a size-dependent free vibration of functionally graded (FG) curved Euler-Bernoulli nanobeam is investigated on the basis of two-phase local/nonlocal models. The governing equation and standard boundary conditions are derived through Hamilton’s principle. The integral constitutive equation is equivalently transformed into differential forms with the corresponding constitutive boundary conditions. The axial force, bending moment, and react force due to foundation are explicitly expressed with respect to displacement variables. With the aid of the constitutive boundary conditions, the possibility of flexibly meeting higher-order variables is achieved. A finite element formulation based on the differential form of the two-phase nonlocal elasticity is utilized to discretize the nanobeam, and a general eigenvalue equation is obtained about the vibration frequency. The efficiency and accuracy of the proposed finite element model are validated by comparison with the results in the literature. The influences of nonlocal parameters, Winkler elastic parameter, central angle of the curved nanobeam, and length–height ratio on the vibration frequencies are studied for different boundary conditions.
{"title":"Finite element formulation for free vibration of the functionally graded curved nonlocal nanobeam resting on nonlocal elastic foundation","authors":"Yuan Tang, PeiLiang Bian, Hai Qing","doi":"10.1177/10775463241278642","DOIUrl":"https://doi.org/10.1177/10775463241278642","url":null,"abstract":"In this work, the influence of elastic foundation on a size-dependent free vibration of functionally graded (FG) curved Euler-Bernoulli nanobeam is investigated on the basis of two-phase local/nonlocal models. The governing equation and standard boundary conditions are derived through Hamilton’s principle. The integral constitutive equation is equivalently transformed into differential forms with the corresponding constitutive boundary conditions. The axial force, bending moment, and react force due to foundation are explicitly expressed with respect to displacement variables. With the aid of the constitutive boundary conditions, the possibility of flexibly meeting higher-order variables is achieved. A finite element formulation based on the differential form of the two-phase nonlocal elasticity is utilized to discretize the nanobeam, and a general eigenvalue equation is obtained about the vibration frequency. The efficiency and accuracy of the proposed finite element model are validated by comparison with the results in the literature. The influences of nonlocal parameters, Winkler elastic parameter, central angle of the curved nanobeam, and length–height ratio on the vibration frequencies are studied for different boundary conditions.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-17DOI: 10.1177/10775463241283663
Tianyu Shi, Jianming Ding, Xia He
The detection of faults in the wheelset-bearing system is crucial for guaranteeing the safety of train operations. The core is to extract the optimal resonance band (ORB) and repetitive transient impact signals from the collected axle box acceleration signals. Accordingly, a novel automatic fault detection method called the bidirectional iterative merging multi-Q tunable-Q wavelet transform (BIMMQTQWT) is proposed to address the issue that existing methods are vulnerable to background noise and irrelevant components. First, a series of band-pass filters with almost constant bandwidth are constructed by the improved multi-Q tunable-Q wavelet transform (IMQTQWT) derived from the fault characteristics. Second, the fault information contained in each sub-band coefficient is preliminarily estimated using the correlative envelope comprehensive indicator (CECI). Third, the ORBs are automatically selected using the maximum CECI based on a strategy called bidirectionally merging adjacent frequency bands (BIMFBs). Finally, Envelope demodulation based on the ORB is executed followed by identifying bearing faults. The effectiveness in detecting multiple wheelset-bearing faults of the proposed method is validated through simulation and bench experiment signals. And the superior performance of the proposed method is exhibited compared with the existing average infogram and resonance sparse decomposition.
{"title":"A novel optimal resonance band selection method for wheelset-bearing fault diagnosis based on tunable-Q wavelet transform","authors":"Tianyu Shi, Jianming Ding, Xia He","doi":"10.1177/10775463241283663","DOIUrl":"https://doi.org/10.1177/10775463241283663","url":null,"abstract":"The detection of faults in the wheelset-bearing system is crucial for guaranteeing the safety of train operations. The core is to extract the optimal resonance band (ORB) and repetitive transient impact signals from the collected axle box acceleration signals. Accordingly, a novel automatic fault detection method called the bidirectional iterative merging multi-Q tunable-Q wavelet transform (BIMMQTQWT) is proposed to address the issue that existing methods are vulnerable to background noise and irrelevant components. First, a series of band-pass filters with almost constant bandwidth are constructed by the improved multi-Q tunable-Q wavelet transform (IMQTQWT) derived from the fault characteristics. Second, the fault information contained in each sub-band coefficient is preliminarily estimated using the correlative envelope comprehensive indicator (CECI). Third, the ORBs are automatically selected using the maximum CECI based on a strategy called bidirectionally merging adjacent frequency bands (BIMFBs). Finally, Envelope demodulation based on the ORB is executed followed by identifying bearing faults. The effectiveness in detecting multiple wheelset-bearing faults of the proposed method is validated through simulation and bench experiment signals. And the superior performance of the proposed method is exhibited compared with the existing average infogram and resonance sparse decomposition.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-17DOI: 10.1177/10775463241283857
Wei Liu, Ruochen Wang, Renkai Ding, Xiangpeng Meng, Dong Sun, Lin Yang
In this study, a constrained H ∞ controller with gain switching is put forward for the active suspension system to improve the overall performance of vehicles equipped with non-pneumatic wheels, considering the nonlinearity of wheel stiffness, actuator saturation, and output constraints. Firstly, a quarter-vehicle model incorporating active suspension and non-pneumatic wheel (NPW) is established experimentally. Secondly, the system model is linearized using Taylor series expansion and linear fractional transformation (LFT). A constrained H ∞ control strategy and a gain switching method based on road classification are proposed, taking into account the parameter uncertainty in linearization process and the variation of performance demands under different road conditions. Then, an L ∞ state observer is designed for the required system state, and the road roughness classifier based on grey wolf optimization (GWO) and probabilistic neural network (PNN) is developed to obtain the necessary road information. A bench test is finally performed using the reconstructed actual road as input. The test results validate the effectiveness and superiority of the proposed control strategy.
在本研究中，考虑到车轮刚度的非线性、执行器饱和度和输出约束，为主动悬架系统提出了一种具有增益切换的约束 H ∞ 控制器，以提高配备非气动车轮的车辆的整体性能。首先，通过实验建立了包含主动悬架和非气动车轮（NPW）的四分之一车辆模型。其次，利用泰勒级数展开和线性分数变换（LFT）对系统模型进行线性化。考虑到线性化过程中参数的不确定性和不同路况下性能需求的变化，提出了基于道路分类的约束 H ∞ 控制策略和增益切换方法。然后，针对所需的系统状态设计了 L ∞ 状态观测器，并开发了基于灰狼优化（GWO）和概率神经网络（PNN）的道路粗糙度分类器，以获取必要的道路信息。最后，使用重建的实际道路作为输入进行了工作台测试。测试结果验证了所提控制策略的有效性和优越性。
{"title":"Constrained H∞ control with gain switching for a nonlinear active suspension system matching non-pneumatic wheel","authors":"Wei Liu, Ruochen Wang, Renkai Ding, Xiangpeng Meng, Dong Sun, Lin Yang","doi":"10.1177/10775463241283857","DOIUrl":"https://doi.org/10.1177/10775463241283857","url":null,"abstract":"In this study, a constrained H<jats:sub> ∞</jats:sub> controller with gain switching is put forward for the active suspension system to improve the overall performance of vehicles equipped with non-pneumatic wheels, considering the nonlinearity of wheel stiffness, actuator saturation, and output constraints. Firstly, a quarter-vehicle model incorporating active suspension and non-pneumatic wheel (NPW) is established experimentally. Secondly, the system model is linearized using Taylor series expansion and linear fractional transformation (LFT). A constrained H<jats:sub> ∞</jats:sub> control strategy and a gain switching method based on road classification are proposed, taking into account the parameter uncertainty in linearization process and the variation of performance demands under different road conditions. Then, an L<jats:sub> ∞</jats:sub> state observer is designed for the required system state, and the road roughness classifier based on grey wolf optimization (GWO) and probabilistic neural network (PNN) is developed to obtain the necessary road information. A bench test is finally performed using the reconstructed actual road as input. The test results validate the effectiveness and superiority of the proposed control strategy.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-17DOI: 10.1177/10775463241276712
Yigen Ren, Wensai Ma
This paper analyzes the motion stability of a 16-pole rotor-active magnetic bearings (rotor-AMB) system and investigates the complex vibrations under a proportional-derivative (PD) controller. First, electromagnetic theory and Newton’s second law are applied to derive the two-degree-of-freedom differential governing equations for the 16-pole rotor-AMB system, incorporating the PD control terms. The resulting differential equations include parametrically excited, quadratic nonlinear, and cubic nonlinear terms. Subsequently, the multiple time scales perturbation analysis method is performed on the obtained governing equations, yielding four-dimensional averaged equations in both Cartesian and polar coordinates. Finally, numerical simulations including the amplitude–frequency response characteristics, motion trajectories, energy–amplitude relationships, as well as bifurcation and chaotic motion of the system are studied. The results indicate that the PD controller affects the softening and hardening spring characteristics of the system and has significant control effects on the system’s amplitude, energy, and stability. Additionally, increasing the differential gain coefficient [Formula: see text] can change the system’s motion from chaotic to periodic.
{"title":"Proportional-derivative control and motion stability analysis of a 16-pole legs rotor-active magnetic bearings system","authors":"Yigen Ren, Wensai Ma","doi":"10.1177/10775463241276712","DOIUrl":"https://doi.org/10.1177/10775463241276712","url":null,"abstract":"This paper analyzes the motion stability of a 16-pole rotor-active magnetic bearings (rotor-AMB) system and investigates the complex vibrations under a proportional-derivative (PD) controller. First, electromagnetic theory and Newton’s second law are applied to derive the two-degree-of-freedom differential governing equations for the 16-pole rotor-AMB system, incorporating the PD control terms. The resulting differential equations include parametrically excited, quadratic nonlinear, and cubic nonlinear terms. Subsequently, the multiple time scales perturbation analysis method is performed on the obtained governing equations, yielding four-dimensional averaged equations in both Cartesian and polar coordinates. Finally, numerical simulations including the amplitude–frequency response characteristics, motion trajectories, energy–amplitude relationships, as well as bifurcation and chaotic motion of the system are studied. The results indicate that the PD controller affects the softening and hardening spring characteristics of the system and has significant control effects on the system’s amplitude, energy, and stability. Additionally, increasing the differential gain coefficient [Formula: see text] can change the system’s motion from chaotic to periodic.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-17DOI: 10.1177/10775463241283867
Zirun Wang, Wei Wan, Biyu Ye, Jingjun Tan, Ming Cai
The development of a horn sound capture system, capable of replacing manual control, offers a promising solution for alleviating horn noise. Existing horn sound systems lack localization algorithms that are capable of robustly resisting interference. To address this issue, this paper introduces an innovative horn sound capture system, including hardware and algorithms for sound recognition and localization. The pivotal innovation of the system is the introduction of the Sub-SRP algorithm, an advancement of the steered-response power phase transform (SRP-PHAT). Leveraging the frequency characteristics of horn sounds, it employs a series of filtering and spectral subtraction techniques to effectively filter out non-horn noise sources. In the interference experiment and field test, the Sub-SRP algorithm achieved DOA scores of 0.96 and 0.95, respectively, showing an approximately 10% improvement compared to the existing weighted SRP-PHAT, this improvement is even more pronounced under strong interference, increasing to 17%. This improvement significantly enhances the system’s ability to accurately capture honking vehicles and resist interference. Additionally, the horn sound recognition algorithm achieved accuracy rates of 95.75% and 97.65% in the two experiments, demonstrating the system’s effectiveness. In summary, this study contributes to the advancement of urban noise management and intelligent noise control systems.
{"title":"Tailored for vehicle horn: A novel sound source capture method","authors":"Zirun Wang, Wei Wan, Biyu Ye, Jingjun Tan, Ming Cai","doi":"10.1177/10775463241283867","DOIUrl":"https://doi.org/10.1177/10775463241283867","url":null,"abstract":"The development of a horn sound capture system, capable of replacing manual control, offers a promising solution for alleviating horn noise. Existing horn sound systems lack localization algorithms that are capable of robustly resisting interference. To address this issue, this paper introduces an innovative horn sound capture system, including hardware and algorithms for sound recognition and localization. The pivotal innovation of the system is the introduction of the Sub-SRP algorithm, an advancement of the steered-response power phase transform (SRP-PHAT). Leveraging the frequency characteristics of horn sounds, it employs a series of filtering and spectral subtraction techniques to effectively filter out non-horn noise sources. In the interference experiment and field test, the Sub-SRP algorithm achieved DOA scores of 0.96 and 0.95, respectively, showing an approximately 10% improvement compared to the existing weighted SRP-PHAT, this improvement is even more pronounced under strong interference, increasing to 17%. This improvement significantly enhances the system’s ability to accurately capture honking vehicles and resist interference. Additionally, the horn sound recognition algorithm achieved accuracy rates of 95.75% and 97.65% in the two experiments, demonstrating the system’s effectiveness. In summary, this study contributes to the advancement of urban noise management and intelligent noise control systems.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-17DOI: 10.1177/10775463241273077
Ali Keymasi-Khalaji, Fatemeh Savaedi-Safihi
This article addresses the control of an underwater welding robot in 3D space. A control approach combining a finite time sliding mode controller for position and orientation control and feedback linearization for controlling one degree of freedom of the welding arm is adopted. The utilization of underwater robots in marine environments is often hindered by uncertainties and disturbances induced by ocean waves and currents, resulting in decreased accuracy and operational disruptions. To overcome these challenges, a novel observer based on a radial basis function neural network is developed to enhance the performance of the underwater welding robot. The neural network’s weights are optimized using the Lyapunov method within the control law framework. Through simulations, the article evaluates the observer’s efficacy in accurately tracking reference trajectories in the presence of uncertainties. The results underscore the significant contribution of this estimator in mitigating uncertainties and disturbances, thereby substantially improving the overall performance and operational reliability of underwater welding robots. The control strategies and observer design presented in this study pave the way for enhanced accuracy, stability, and efficiency in complex underwater welding operations.
{"title":"Tracking control and neural network disturbance observer for a 6 DoF underwater welding robot","authors":"Ali Keymasi-Khalaji, Fatemeh Savaedi-Safihi","doi":"10.1177/10775463241273077","DOIUrl":"https://doi.org/10.1177/10775463241273077","url":null,"abstract":"This article addresses the control of an underwater welding robot in 3D space. A control approach combining a finite time sliding mode controller for position and orientation control and feedback linearization for controlling one degree of freedom of the welding arm is adopted. The utilization of underwater robots in marine environments is often hindered by uncertainties and disturbances induced by ocean waves and currents, resulting in decreased accuracy and operational disruptions. To overcome these challenges, a novel observer based on a radial basis function neural network is developed to enhance the performance of the underwater welding robot. The neural network’s weights are optimized using the Lyapunov method within the control law framework. Through simulations, the article evaluates the observer’s efficacy in accurately tracking reference trajectories in the presence of uncertainties. The results underscore the significant contribution of this estimator in mitigating uncertainties and disturbances, thereby substantially improving the overall performance and operational reliability of underwater welding robots. The control strategies and observer design presented in this study pave the way for enhanced accuracy, stability, and efficiency in complex underwater welding operations.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-14DOI: 10.1177/10775463241280341
Shuai He, Xiangyang Sun, Anpeng Xu, He Zhu, Zhenbang Xu
Accurate measurement of disturbance forces is an essential prerequisite for the simulation and analysis of micro-vibrations of space optical devices. Most of the current force measurement methods are based on force sensors, which have problems such as serious coupling between sensors, and the measurement accuracy is easily affected by the preload force. In order to solve these problems, a six-dimensional disturbance force measurement method based on acceleration sensors is proposed in this paper. First, the basic structure of the force measurement platform is introduced, and then the dynamics model of the platform is established and its force measurement principle is analyzed. Then the simulation analysis of the measurement accuracy of the platform is carried out by the Monte Carlo method. The analysis results show that the measurement accuracy of the disturbance force is proportional to the measurement accuracy of the acceleration sensor and the mass matrix recognition accuracy. When the errors of the acceleration sensor and mass matrix are within the normal range, the measurement error of the force measurement platform is less than 15%. Finally, a single-degree-of-freedom disturbance force measurement verification platform is built, and the test results show that the disturbance force is basically proportional to the acceleration of the platform when it is far from the resonance frequency, which verifies the correctness of the method to a certain extent. The measurement method is simple in structure and easy to implement, and can perform real-time measurement. Moreover, the measurement frequency is wide and the resolution is high, which is suitable for the measurement of disturbance force in the form of sinusoidal vibration or multi-frequency line spectrum.
{"title":"A spatial six-dimensional force measurement method based on acceleration sensors","authors":"Shuai He, Xiangyang Sun, Anpeng Xu, He Zhu, Zhenbang Xu","doi":"10.1177/10775463241280341","DOIUrl":"https://doi.org/10.1177/10775463241280341","url":null,"abstract":"Accurate measurement of disturbance forces is an essential prerequisite for the simulation and analysis of micro-vibrations of space optical devices. Most of the current force measurement methods are based on force sensors, which have problems such as serious coupling between sensors, and the measurement accuracy is easily affected by the preload force. In order to solve these problems, a six-dimensional disturbance force measurement method based on acceleration sensors is proposed in this paper. First, the basic structure of the force measurement platform is introduced, and then the dynamics model of the platform is established and its force measurement principle is analyzed. Then the simulation analysis of the measurement accuracy of the platform is carried out by the Monte Carlo method. The analysis results show that the measurement accuracy of the disturbance force is proportional to the measurement accuracy of the acceleration sensor and the mass matrix recognition accuracy. When the errors of the acceleration sensor and mass matrix are within the normal range, the measurement error of the force measurement platform is less than 15%. Finally, a single-degree-of-freedom disturbance force measurement verification platform is built, and the test results show that the disturbance force is basically proportional to the acceleration of the platform when it is far from the resonance frequency, which verifies the correctness of the method to a certain extent. The measurement method is simple in structure and easy to implement, and can perform real-time measurement. Moreover, the measurement frequency is wide and the resolution is high, which is suitable for the measurement of disturbance force in the form of sinusoidal vibration or multi-frequency line spectrum.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Energy harvesters (i.e., EH) constituting nowadays an essential part of renewable energy engineering; hence, apart from numerical modeling, experimental studies are necessary, constituting reliable input for durable design and structural safety assessments. In the current study, galloping EH’s performance was analyzed, utilizing extensive laboratory wind-tunnel tests, conducted under realistic windspeed conditions. The novel structural multivariate risks assessment methodology, presented in the current study is particularly feasible for multi-dimensional nonlinear EH dynamic systems, that have been either directly Monte Carlo (i.e., MC) numerically simulated or physically measured over a representative temporal lapse, providing piecewise ergodic time series. As shown in this analysis, the suggested multivariate methodology accurately enables accurate predictions of the EH dynamic system’s failure/hazard or damage risks, based on laboratory-measured EH system’s dynamics. Furthermore, nonlinear inter-correlations between various systems’ critical components are not always easily handled by classic risk assessment techniques, when dealing with a high-dimensional system’s raw time series. The primary goal of this study was validation and benchmarking the novel risk assessment methodology, which can extract pertinent information, contained within the EH system’s dynamics, based on lab-recorded time histories. In conclusion, the novel hypersurface methodology presented in this study is generic, providing additional capability to accurately, yet efficiently predict damage/failure risks for a variety of nonlinear EH multidimensional systems. Relatively narrow confidence bands have been reported for the forecasted damage and failure levels, indicating both the robustness of the experimental setup, as well as practical design virtues of the advocated Gaidai hypersurface risks assessment methodology. Note that the presented methodology being mathematically exact does not rely on pre-assumptions and yet it is of general purpose.
{"title":"Limit hypersurface state-of-the-art damage assessment approach for a galloping energy harvester, accounting for memory effects","authors":"Oleg Gaidai, Zirui Liu, Yu Cao, Fuxi Zhang, Yan Zhu, Jinlu Sheng","doi":"10.1177/10775463241279993","DOIUrl":"https://doi.org/10.1177/10775463241279993","url":null,"abstract":"Energy harvesters (i.e., EH) constituting nowadays an essential part of renewable energy engineering; hence, apart from numerical modeling, experimental studies are necessary, constituting reliable input for durable design and structural safety assessments. In the current study, galloping EH’s performance was analyzed, utilizing extensive laboratory wind-tunnel tests, conducted under realistic windspeed conditions. The novel structural multivariate risks assessment methodology, presented in the current study is particularly feasible for multi-dimensional nonlinear EH dynamic systems, that have been either directly Monte Carlo (i.e., MC) numerically simulated or physically measured over a representative temporal lapse, providing piecewise ergodic time series. As shown in this analysis, the suggested multivariate methodology accurately enables accurate predictions of the EH dynamic system’s failure/hazard or damage risks, based on laboratory-measured EH system’s dynamics. Furthermore, nonlinear inter-correlations between various systems’ critical components are not always easily handled by classic risk assessment techniques, when dealing with a high-dimensional system’s raw time series. The primary goal of this study was validation and benchmarking the novel risk assessment methodology, which can extract pertinent information, contained within the EH system’s dynamics, based on lab-recorded time histories. In conclusion, the novel hypersurface methodology presented in this study is generic, providing additional capability to accurately, yet efficiently predict damage/failure risks for a variety of nonlinear EH multidimensional systems. Relatively narrow confidence bands have been reported for the forecasted damage and failure levels, indicating both the robustness of the experimental setup, as well as practical design virtues of the advocated Gaidai hypersurface risks assessment methodology. Note that the presented methodology being mathematically exact does not rely on pre-assumptions and yet it is of general purpose.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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