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Design and characterize of kirigami-inspired springs and the application in vertebrae exoskeleton for adolescent idiopathic scoliosis brace treatment 基里伽米弹簧的设计、特点及在青少年特发性脊柱侧凸支架治疗中的应用
IF 4.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2023-03-22 DOI: 10.3389/fmech.2023.1152930
Q. Lei, Jing Shu, Junming Wang, H. Cheung, J. Cheung, Wing Fai Wong, Sanders Cheuk Yin Lau, J. Yip, Raymond K. Tong
Adolescent idiopathic scoliosis is a common condition that affects children between the age of 10 and young adulthood. Rigid brace treatment is an effective treatment to control the progression of spinal deformity. However, it limits mobility and causes discomfort, which leads to low treatment compliance. In this study, we developed and characterized a kirigami-inspired CT/MRI compatible spring that could be employed to modify our previously designed exoskeleton hinge vertebrae to provide immediate in-brace correction, good wear comfort, and one that does not inhibit mobility simultaneously. Additive manufacturing has drawn significant interest in academic and industrial terms due to its ability to produce geometrically complex structures. The structural design and dimension of the proposed 3D printed kirigami-inspired springs were optimized with the finite element method (FEM). The carbon-fiber-reinforced nylon material (PA-CF) was selected as the material of the kirigami-inspired spring with the balance of printing easiness and performance of the material. The stiffness of designed kirigami-inspired springs varied between 1.20 and 42.01 N/mm. A case series study with three scoliosis patients has been conducted to investigate the immediate in-brace effect on reducing the spinal curvature and asymmetry of the body contours using radiographic examination. The experiment results show that there are 4.6%–50.5% improvements in Cobb angle for different sections of spines. The X-ray images proved that our kirigami-inspired springs would not block views for Cobb angle measurements.
青少年特发性脊柱侧弯是一种常见的疾病,影响10岁至成年期的儿童。刚性支架治疗是控制脊柱畸形进展的有效治疗方法。然而,它限制了行动能力并导致不适,从而导致治疗依从性低。在这项研究中,我们开发并表征了一种受基里加米启发的CT/MRI兼容弹簧,该弹簧可用于修改我们之前设计的外骨骼铰链椎骨,以提供即时的支架内矫正、良好的佩戴舒适性,并且不会同时抑制活动性。增材制造因其生产几何复杂结构的能力而引起了学术界和工业界的极大兴趣。采用有限元法对所提出的基于基里加米的3D打印弹簧的结构设计和尺寸进行了优化。选择碳纤维增强尼龙材料(PA-CF)作为基里加米风格弹簧的材料,兼顾了材料的印刷容易性和性能。设计的基里加米风格弹簧的刚度在1.20和42.01 N/mm之间变化。对三名脊柱侧弯患者进行了一项病例系列研究,以研究支架内放疗在减少脊柱弯曲和身体轮廓不对称方面的即时效果。实验结果表明,不同节段脊柱的Cobb角有4.6%-50.5%的改善。X射线图像证明,我们受基里加米启发的弹簧不会阻挡Cobb角测量的视野。
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引用次数: 1
Numerical realization of a semi-active virtual acoustic black hole effect 半主动虚声黑洞效应的数值实现
IF 4.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2023-03-15 DOI: 10.3389/fmech.2023.1126489
S. Soleimanian, G. Petrone, F. Franco, S. De Rosa, P. Kołakowski
Noise mitigation by means of the acoustic black hole (ABH) effect is a well-known engineering solution. However, the conventional method of applying ABH effect which requires modification of the structure geometry has various limitations which encourage the research of virtual ABH concept. In this study, the effect of ABH was applied through introducing virtual stiffness by a shunt circuit. According to the force-voltage electric analogy, stiffness has an inverse relationship with capacitance. So that the ABH effect can be virtually realized by following a power law profile using an array of independent capacitive shunts. The concept is studied through finite element simulation developing a macro code in ANSYS Parametric Design Language (APDL). To evaluate the influence of capacitance profile on the acoustic radiated power, parametric studies are conducted. Based on the results of the parametric studies, the capacitance profile is tuned for minimum radiated power. It is revealed that the virtual acoustic black hole (ABH) effect can offer 10.29%, 6.37%, and 7.47% reduction in the radiated power from the first to the last targeted mode, respectively. The virtual ABH effect introduced in this study can be used for semi-active structural noise isolation without any weight or manufacturing penalty.
通过声学黑洞(ABH)效应来减轻噪声是一种众所周知的工程解决方案。然而,传统的应用ABH效应的方法需要修改结构几何形状,具有各种局限性,这鼓励了虚拟ABH概念的研究。在本研究中,通过并联电路引入虚拟刚度来应用ABH的效果。根据力-电压-电类比,刚度与电容成反比。因此,ABH效应实际上可以通过使用独立电容分流器阵列遵循幂律分布来实现。通过有限元仿真研究了这一概念,并用ANSYS参数化设计语言(APDL)开发了宏代码。为了评估电容分布对声辐射功率的影响,进行了参数研究。基于参数研究的结果,电容分布被调整为最小辐射功率。结果表明,从第一个目标模式到最后一个目标模式,虚拟声学黑洞(ABH)效应可以分别降低10.29%、6.37%和7.47%的辐射功率。本研究中引入的虚拟ABH效应可以用于半主动结构噪声隔离,而不会产生任何重量或制造损失。
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引用次数: 0
A brief review of the rapid transformation of driveline lubricants for hybrid electric and electric vehicles 简要回顾了混合动力汽车和电动汽车传动系润滑油的快速转型
IF 4.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2023-03-13 DOI: 10.3389/fmech.2023.1139385
T. Newcomb
Hybrid electric and electric vehicles have represented a small portion of the automotive market for many years and mainly use current lubricants, typically automatic transmission fluids (ATFs). However, regulatory compliance to limit greenhouse gases and increased consumer demand have resulted in a rapid global transition to electrified vehicles. This has prompted the need for new advances in vehicle technology to improve efficiency and thereby increase range. Enabling and optimizing such advances requires a new generation of driveline lubricants. Incorporating an electric motor in a transmission or axle, where the motor is exposed to the gear box lubricant, creates new challenges that focus attention on lubricant characteristics that were previously not differentiating features, for example, electrical and thermal properties. Additionally, lubricants must now also be compatible with the constituents used in electric motors which include new polymeric materials and, in some cases, exposed copper. Compatibility tests of these polymers vary within the industry and the risk of copper corrosion in these applications is not always properly assessed by current specification tests. In this paper we will begin with a brief history of electric vehicles, highlight how driveline lubricants, specifically ATFs, have evolved over the years to meet new hardware requirements and then describe the performance requirements expected of lubricants specifically designed for vehicles with electric drive units (EDUs). Our primary goal, however, is to summarize the recent literature that illustrates the changing importance of various lubricant performance properties, new proposed test methods and offer some insight into future e-lubricant evolution.
多年来,混合动力电动汽车和电动汽车只占汽车市场的一小部分,主要使用当前的润滑油,通常是自动变速器油(ATF)。然而,遵守限制温室气体的法规和消费者需求的增加导致了全球向电动汽车的快速过渡。这促使人们需要车辆技术的新进步来提高效率,从而增加续航里程。实现和优化这些进步需要新一代传动系润滑剂。在变速器或车轴中加入电动机,电动机暴露在齿轮箱润滑剂中,这带来了新的挑战,将注意力集中在以前没有区分特征的润滑剂特性上,例如电气和热特性。此外,润滑剂现在还必须与电动机中使用的成分兼容,这些成分包括新的聚合物材料,在某些情况下,还包括暴露的铜。这些聚合物的相容性测试在行业内各不相同,目前的规范测试并不总能正确评估这些应用中的铜腐蚀风险。在本文中,我们将从电动汽车的简史开始,重点介绍传动系润滑油,特别是ATF,是如何在多年来不断发展以满足新的硬件要求的,然后描述专门为配备电动驱动单元(EDU)的车辆设计的润滑油的预期性能要求。然而,我们的主要目标是总结最近的文献,这些文献说明了各种润滑剂性能特性的重要性不断变化,提出了新的测试方法,并对未来的电子润滑剂发展提供了一些见解。
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引用次数: 1
Personalized displacement ventilation as an energy-efficient solution for airborne disease transmission control in offices 个性化置换通风作为办公室空气传播控制的节能解决方案
IF 4.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2023-03-06 DOI: 10.3389/fmech.2023.1148276
Lars La Heij, S. Gkantonas, E. Mastorakos
There is evidence to suggest that airborne droplets play an important role in the transmission of respiratory diseases. The highest risk of exposure to these pathogens is in indoor environments, where airflow control has been recognized as one of the most effective engineering means to combat its spread. However, this can contribute to a significant increase in energy costs, as conventional ventilation is often not designed to remove contaminants efficiently. In this study, Computational Fluid Dynamics simulations were used to analyze how a novel ventilation approach, called Personalized Displacement Ventilation (PerDiVent), can simultaneously reduce both pathogenic airborne transmission and reduce energy costs in an open office. In addition, thermal comfort and noise were investigated to assess the practicality of the concept. PerDiVent was found to reduce the risk of cross infection by a factor of 1.08–2.0 compared to mixing ventilation in the worst and best case scenarios analyzed, and lead to savings in mechanical power of at least 30%. Furthermore, there is great potential to further improve the system and to increase the stated numbers substantially with relatively simple alterations to the design. Tools that can be used to great advantage for such optimization are also proposed in this work. These include a simple integral model and analytical metrics to estimate the reduction in cross-infection risk and energy savings as a function of PerDiVent’s effectiveness in removing contaminants. Finally, the system has a modular and highly flexible arrangement, which makes it suitable for retrofitting purposes in various indoor environments and integration with current ventilation systems. The concept shows great promise for the future, where ventilation is required to create healthier and more sustainable environments.
有证据表明,空气中的飞沫在呼吸道疾病的传播中起着重要作用。接触这些病原体的风险最高的是室内环境,在室内环境中,气流控制被认为是对抗其传播的最有效的工程手段之一。然而,这可能会导致能源成本的显著增加,因为传统的通风往往不是为了有效地去除污染物而设计的。在这项研究中,使用计算流体动力学模拟来分析一种名为个性化置换通风(PerDiVent)的新型通风方法如何在开放式办公室中同时减少致病性空气传播和降低能源成本。此外,还对热舒适性和噪音进行了调查,以评估该概念的实用性。在分析的最坏和最佳情况下,与混合通风相比,PerDiVent可将交叉感染的风险降低1.08-2.0倍,并可节省至少30%的机械功率。此外,通过对设计进行相对简单的修改,进一步改进系统并大幅增加所述数量的潜力很大。在这项工作中,还提出了可以用于这种优化的工具。其中包括一个简单的积分模型和分析指标,以估计交叉感染风险的降低和作为PerDiVent去除污染物有效性函数的能源节约。最后,该系统具有模块化和高度灵活的布置,适合在各种室内环境中进行改造,并与当前的通风系统集成。这一概念显示出对未来的巨大希望,需要通风来创造更健康、更可持续的环境。
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引用次数: 0
Editorial: Design and analysis of CMOS-MEMS transducers 社论:CMOS-MEMS换能器的设计与分析
IF 4.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2023-03-02 DOI: 10.3389/fmech.2023.1142981
A. Zope, Sheng-Shian Li
Throughout human history, certain technologies/discoveries (e.g., fire, wheel, agriculture, printing, etc.) have had an unparalleled effect on the lifestyle. Integrated Circuit (IC) technology had an imitable impact on day-to-day lives in the late 20th century. The rapid growth in the performance of computation and its related applications was possible due to the regular shrinking of transistor size following Moore’s law (Moore, 2006). There is a growing demand for low-power, high computation, high data rate, and wireless chips in industry, automobiles, hospitals, homes, and personal devices. The recent semiconductor shortage due to the pandemic disrupted manufacturing directly affects the economy of many countries (Saracco, 2022). This has resulted in renewed interest in the acquisition of semiconductor technologies around the world. The pervasive adoption of 5G communication systems, electronic vehicles, high-performance computing, virtual reality, and personal entertainment devices is constrained by the complex and expensive fabrication technology required to continue device scaling with more-Moore (Yeric, 2016). Microelectromechanical Systems (MEMS) have been used to realize complex functions like sensors and actuators. MEMS can be combined with circuits to provide more-than-Moore functionality. The technology scaling has resulted in system-on-chip (SoC) which incorporates analog, digital, and RF circuits to satisfy multiple applications (i.e., more-than-Moore). This was extended with MEMS to the system-in-package (SiP) incorporating an accelerometer, gyroscope, barometer, magnetometer, heart-rate sensors, etc., with SoC in a package (Lammel, 2015). Traditionally, piezoelectric MEMS has seen greater interest due to the larger electromechanical coupling coefficient and direct replacement with quartz systems. Piezoelectric materials are not compatible with the CMOS fabrication process and require SiP. This limits device performance due to the parasitic effect of inter-package interconnects (Pillai et al., 2016). The fast data rate of modern SoC requires a small form factor to reduce the parasitic effect from PCB routing. With the advent of the Internet of Things (IoT), smart gadgets are needed to prevent congestion of the widely used 2.4 GHz band. Smart devices can collect data and process it to give predictive analysis, e.g., fall detection and call for assistance, warning about irregular heartbeats, increase in particulate matter, etc. A Smart system-on-chip (S-SoC) is the next logical step. A conceptual smart system on chip schematic for MEMS and circuit integration is depicted in Figure 1. The S-SoC would have sensors for the detection of physical, chemical, optical, and biological quantities. It would also have a MEMS transceiver integrated with OPEN ACCESS
纵观人类历史,某些技术/发现(如火、车轮、农业、印刷术等)对生活方式产生了无与伦比的影响。集成电路(IC)技术在20世纪后期对日常生活产生了不可模仿的影响。计算性能及其相关应用的快速增长是由于遵循摩尔定律的晶体管尺寸的定期缩小(Moore, 2006)。工业、汽车、医院、家庭和个人设备对低功耗、高计算、高数据速率和无线芯片的需求不断增长。最近的半导体短缺由于大流行扰乱制造业直接影响到许多国家的经济(Saracco, 2022)。这导致了对全球半导体技术收购的新兴趣。5G通信系统、电子汽车、高性能计算、虚拟现实和个人娱乐设备的普遍采用受到了更摩尔设备扩展所需的复杂而昂贵的制造技术的限制(Yeric, 2016)。微机电系统(MEMS)已被用于实现传感器和执行器等复杂功能。MEMS可以与电路相结合,以提供比摩尔更多的功能。该技术的扩展导致了集成模拟、数字和射频电路的片上系统(SoC),以满足多种应用(即超过摩尔)。通过MEMS将其扩展到系统级封装(SiP),其中包含加速度计、陀螺仪、气压计、磁力计、心率传感器等,并将SoC集成在一个封装中(Lammel, 2015)。传统上,压电MEMS因其较大的机电耦合系数和与石英系统的直接替代而受到更大的关注。压电材料与CMOS制造工艺不兼容,需要SiP。由于封装间互连的寄生效应,这限制了设备性能(Pillai等人,2016)。现代SoC的快速数据速率需要一个小的外形因素,以减少PCB路由的寄生效应。随着物联网(IoT)的出现,需要智能设备来防止广泛使用的2.4 GHz频段的拥塞。智能设备可以收集数据并对其进行处理以进行预测分析,例如,摔倒检测和呼叫援助,不规则心跳警告,颗粒物增加等。智能片上系统(S-SoC)是下一个合乎逻辑的步骤。图1描述了用于MEMS和电路集成的概念性智能系统片上原理图。S-SoC将具有用于检测物理,化学,光学和生物数量的传感器。它还将有一个集成了OPEN ACCESS的MEMS收发器
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引用次数: 0
A force controlled tribometer for pre-sliding measurements at the nanometer scale 用于纳米尺度预滑动测量的力控摩擦计
IF 4.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2023-03-02 DOI: 10.3389/fmech.2023.1019979
Junxiao Du, Steve Franklin, B. Weber
In the pre-sliding friction regime, interfaces partially stick and partially slip. The pre-slip is thought to be locally initiated at regions of the interface where the ratio of shear stress to normal stress exceeds a critical value. The displacements involved in pre-slip can be limited to the nanoscale, especially for stiff interfaces. Furthermore, little is known experimentally about the interplay between surface topography, pre-sliding behavior and wear. In this work, we introduce a pre-sliding tribometer that enables the study of how the pre-sliding friction at various types of ball-on-flat interfaces evolves as a function of wear. Polytetrafluoroethylene-on-silicon (PTFE-on-Si) pre-sliding measurements covering interfacial displacements up to 50 nm, conducted with the new instrument, show good agreement with Mindlin theory predictions, without adjustable parameters.
在预滑动摩擦状态下,界面部分粘着,部分滑动。预滑移被认为是在剪应力与正应力之比超过临界值的界面区域局部开始的。预滑移所涉及的位移可以限制在纳米尺度,特别是对于刚性界面。此外,关于表面形貌、预滑动行为和磨损之间的相互作用,实验知之甚少。在这项工作中,我们介绍了一种预滑动摩擦计,可以研究各种类型的球-平面界面的预滑动摩擦如何随着磨损的变化而变化。使用新仪器进行的聚四氟乙烯-硅(ptfe -si)预滑动测量覆盖了高达50 nm的界面位移,与Mindlin理论预测非常吻合,没有可调参数。
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引用次数: 0
Postprocessor development for ultrasonic cutting of honeycomb core curved surface with a straight blade 直刃超声切割蜂窝芯曲面后置处理器的研制
IF 4.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2023-03-01 DOI: 10.1007/s11465-022-0729-8
Heng Luo, Z. Dong, R. Kang, Yidan Wang, Jian-hua Sun, Zhaocheng Wei
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引用次数: 0
Full-field dynamic strain reconstruction of an aero-engine blade from limited displacement responses 基于有限位移响应的航空发动机叶片的全场动态应变重建
IF 4.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2023-03-01 DOI: 10.1007/s11465-022-0731-1
Chunyan Ao, Baijie Qiao, Kai Zhou, Lei Chen, S. Fu, X. Chen
{"title":"Full-field dynamic strain reconstruction of an aero-engine blade from limited displacement responses","authors":"Chunyan Ao, Baijie Qiao, Kai Zhou, Lei Chen, S. Fu, X. Chen","doi":"10.1007/s11465-022-0731-1","DOIUrl":"https://doi.org/10.1007/s11465-022-0731-1","url":null,"abstract":"","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":" ","pages":"1-17"},"PeriodicalIF":4.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46074685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 review of low-temperature plasma-assisted machining: from mechanism to application 低温等离子体辅助加工综述:从机理到应用
IF 4.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2023-03-01 DOI: 10.1007/s11465-022-0734-y
Jiyu Liu, Yuheng Li, Yang Chen, Yuyang Zhou, Shuaishuai Wang, Zizhen Yuan, Zhuji Jin, Xin Liu
{"title":"A review of low-temperature plasma-assisted machining: from mechanism to application","authors":"Jiyu Liu, Yuheng Li, Yang Chen, Yuyang Zhou, Shuaishuai Wang, Zizhen Yuan, Zhuji Jin, Xin Liu","doi":"10.1007/s11465-022-0734-y","DOIUrl":"https://doi.org/10.1007/s11465-022-0734-y","url":null,"abstract":"","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":"18 1","pages":"1-19"},"PeriodicalIF":4.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49107011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 2
Cutting performance of surgical electrodes by constructing bionic microstriped structures 构建仿生微条纹结构的外科电极切割性能研究
IF 4.5 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2023-03-01 DOI: 10.1007/s11465-022-0728-9
Kaikai Li, Longsheng Lu, Huaping Chen, Guoxiang Jiang, Huanwen Ding, M. Yu, Yingxi Xie
{"title":"Cutting performance of surgical electrodes by constructing bionic microstriped structures","authors":"Kaikai Li, Longsheng Lu, Huaping Chen, Guoxiang Jiang, Huanwen Ding, M. Yu, Yingxi Xie","doi":"10.1007/s11465-022-0728-9","DOIUrl":"https://doi.org/10.1007/s11465-022-0728-9","url":null,"abstract":"","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":" ","pages":"1-16"},"PeriodicalIF":4.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42633826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 5
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Frontiers of Mechanical Engineering
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