International Journal of Mechanical System Dynamics最新文献

Vibration control for the solar panels of spacecraft: Innovation methods and potential approaches 航天器太阳能电池板的振动控制：创新方法和潜在途径

International Journal of Mechanical System Dynamics Pub Date : 2023-12-30 DOI: 10.1002/msd2.12094

Dongxu Li, Wang Liu

引用次数: 0

Alleviating vibrations along a harmonically driven nonuniform Euler–Bernoulli beam by imposing nodes 通过施加节点缓解谐波驱动非均匀欧拉-伯努利梁的振动

International Journal of Mechanical System Dynamics Pub Date : 2023-12-27 DOI: 10.1002/msd2.12090

Melis Baltan-Brunet, Fionna Kopp, Philip D. Cha

{"title":"Alleviating vibrations along a harmonically driven nonuniform Euler–Bernoulli beam by imposing nodes","authors":"Melis Baltan-Brunet, Fionna Kopp, Philip D. Cha","doi":"10.1002/msd2.12090","DOIUrl":"https://doi.org/10.1002/msd2.12090","url":null,"abstract":"A passive approach is developed to quench excess vibration along a harmonically driven, arbitrarily supported, nonuniform Euler–Bernoulli beam with constant thickness (height) and varying width. Vibration suppression is achieved by attaching properly tuned vibration absorbers to enforce nodes, or points of zero vibration, along the beam. An efficient hybrid method is proposed whereby the finite element method is used to model the nonuniform beams, and a formulation based on the assumed modes method is used to determine the required attachment force supplied by each absorber to induce the desired nodes. Knowing the attachment forces needed to induce nodes, design plots are generated for the absorber parameters as a function of the tolerable vibration amplitude for each absorber mass. When the node locations are judiciously chosen, it is possible to dramatically suppress the vibration along a selected region of the beam. As such, sensitive instruments can be placed in this region and will remain nearly stationary. Numerical studies illustrate the application to several systems with various types of nonuniformity, boundary conditions, and attachment and node locations; these examples validate the proposed method to passively control excess vibration by inducing nodes on nonuniform beams subjected to harmonic excitations.","PeriodicalId":501255,"journal":{"name":"International Journal of Mechanical System Dynamics","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of temperature on tensile and vibration properties of bilayer boron nitride 温度对双层氮化硼拉伸和振动特性的影响

International Journal of Mechanical System Dynamics Pub Date : 2023-12-25 DOI: 10.1002/msd2.12093

Demin Zhao, Kexin Fang

引用次数: 0

Analysis of friction‐related acoustic emission in bolted joint structures 螺栓连接结构中与摩擦有关的声发射分析

International Journal of Mechanical System Dynamics Pub Date : 2023-12-21 DOI: 10.1002/msd2.12091

Jiaying Sun, Huiyi Yang, Dongwu Li, Chao Xu

{"title":"Analysis of friction‐related acoustic emission in bolted joint structures","authors":"Jiaying Sun, Huiyi Yang, Dongwu Li, Chao Xu","doi":"10.1002/msd2.12091","DOIUrl":"https://doi.org/10.1002/msd2.12091","url":null,"abstract":"A bolted joint may be in a state of continuous fretting friction and wear under random oscillatory loading, which makes the bolted joint prone to loosening. Therefore, it is essential to find a way to monitor the contact state of a bolted joint on time and handle it adeptly. Acoustic emission (AE) signals will be generated during the reciprocating friction of the bolted joint interface. Exploring the relationship between the frictional slip features and the acoustic emission characteristics under different bolt preloads can lay the foundation for using the acoustic emission techniques to monitor the pretightening state of bolted joints. This paper experimentally investigates the acoustic emission signals of a bolted joint structure during friction under different preloads, three repeated tests are implemented. The relationship between friction behavior and acoustic emission characteristics under different preloads is studied. The evolution of classical acoustic emission parameters and kinematic parameters with bolt preload levels is also analyzed. The 3‐D topography of the specimens after parametric tests is analyzed. The results show that the characteristics of both burst‐type and continuous‐type acoustic emission can reflect different friction behavior under different bolt preloads. The evolution curves of acoustic emission parameters changed under the interaction of both frictional kinematic parameters and bolt preload levels. For the 3‐D surface topography, the reciprocating friction shears the peaks and fills the surface valleys, and the topography of the scratched surface areas is redistributed.","PeriodicalId":501255,"journal":{"name":"International Journal of Mechanical System Dynamics","volume":"135 28","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138953381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Launching ceremony of the International Society of Mechanical System Dynamics Convened in Beijing, China 国际机械系统动力学学会启动仪式在中国北京举行

International Journal of Mechanical System Dynamics Pub Date : 2023-12-21 DOI: 10.1002/msd2.12089

Tong Zhang, Qinbo Zhou, Yanni Zhang, Hang Zhang

引用次数: 0

Dynamic transfer model and applications of a penetrating projectile‐fuze multibody system 穿甲弹-引信多体系统的动态转移模型及应用

International Journal of Mechanical System Dynamics Pub Date : 2023-12-21 DOI: 10.1002/msd2.12092

Da Yu, Benqiang Yang, Kai Yan, Changsheng Li, Xiang Ma, Xiangyu Han, He Zhang, Keren Dai

{"title":"Dynamic transfer model and applications of a penetrating projectile‐fuze multibody system","authors":"Da Yu, Benqiang Yang, Kai Yan, Changsheng Li, Xiang Ma, Xiangyu Han, He Zhang, Keren Dai","doi":"10.1002/msd2.12092","DOIUrl":"https://doi.org/10.1002/msd2.12092","url":null,"abstract":"In modern warfare, fortifications are being placed deeper underground and with increased mechanical strength, placing higher demands on the target speed of the penetrating munitions that attack them. In such practical scenarios, penetrating fuze inevitably experience extreme mechanical loads with long pulse durations and high shock strengths. Experimental results indicate that their shock accelerations can even exceed those of the projectile by several times. However, due to the unclear understanding of the dynamic transfer mechanism of the penetrating fuze system under such extreme mechanical conditions, there is still a lack of effective methods to accurately estimate and design protection against the impact loads on the penetrating fuze. This paper focuses on the dynamic response of penetrating munitions and fuzes under high impact, establishing a nonlinear dynamic transfer model for penetrating fuze systems, which can calculate the sensor overload signal of the fuze location. The results show that the relative error between the peak acceleration obtained by the proposed multibody dynamic transfer model and that obtained by experimental tests is only 15.7%, which is much lower than the 26.4% error between finite element simulations and experimental tests. The computational burden of the proposed method mainly lies in the parameter calibration process, which needs to be performed only once for a specific projectile‐fuze system. Once calibrated, the model can rapidly conduct parameter scanning simulations for the projectile mass, target plate strength, and impact velocity with an extremely low computational cost to obtain the response characteristics of the projectile‐fuze system under various operating conditions. This greatly facilitates the practical engineering design of penetrating ammunition fuze.","PeriodicalId":501255,"journal":{"name":"International Journal of Mechanical System Dynamics","volume":"57 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138950969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Orthotropic plate model for the vibration of multilayered molybdenum disulfide 多层二硫化钼振动的正交各向异性板模型

International Journal of Mechanical System Dynamics Pub Date : 2023-11-15 DOI: 10.1002/msd2.12088

Mingqian Li, Lifeng Wang

引用次数: 0