Solar panels on spacecraft are typical kinds of flexible structures. Low-frequency and large-amplitude vibrations usually occur due to the inevitable disturbances of deployment impact, attitude/orbit maneuver, separation/docking impact, and so forth. These vibrations degrade the stability of the spacecraft platform, leading to a reduction in imaging quality and pointing direction accuracy. Vibration control is obligatory during flight missions. Here, we summarize the researches on vibration control of the solar panels. First, typical solar panels used in spacecraft and the specific difficulties in dynamic modeling and control design are introduced. Next, the researches on dynamic modeling methods, decentralized vibration control strategy, and in-orbit vibration controller design technologies are presented sequentially. Finally, a practical example where our method was successfully applied in-orbit is described. In conclusion, the theories, methods, and technologies presented in this review hold significant value for achieving high-precision performance in large spacecraft.
{"title":"Vibration control for the solar panels of spacecraft: Innovation methods and potential approaches","authors":"Dongxu Li, Wang Liu","doi":"10.1002/msd2.12094","DOIUrl":"https://doi.org/10.1002/msd2.12094","url":null,"abstract":"Solar panels on spacecraft are typical kinds of flexible structures. Low-frequency and large-amplitude vibrations usually occur due to the inevitable disturbances of deployment impact, attitude/orbit maneuver, separation/docking impact, and so forth. These vibrations degrade the stability of the spacecraft platform, leading to a reduction in imaging quality and pointing direction accuracy. Vibration control is obligatory during flight missions. Here, we summarize the researches on vibration control of the solar panels. First, typical solar panels used in spacecraft and the specific difficulties in dynamic modeling and control design are introduced. Next, the researches on dynamic modeling methods, decentralized vibration control strategy, and in-orbit vibration controller design technologies are presented sequentially. Finally, a practical example where our method was successfully applied in-orbit is described. In conclusion, the theories, methods, and technologies presented in this review hold significant value for achieving high-precision performance in large spacecraft.","PeriodicalId":501255,"journal":{"name":"International Journal of Mechanical System Dynamics","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139063494","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}
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.
{"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}
Hexagonal boron nitride (h-BN) is a semiconductor material with a wide band gap, holding promising potential for applications in thermal conductivity devices and nanoresonators in the field of microelectronics. Here, molecular dynamics is simulated to investigate the tensile and vibrational behaviors of bilayer h-BN under five different stacking modes across varying temperatures. The mechanical properties of five different stacking modes of h-BN at various temperatures are focused on, including Young's modulus, the ultimate stress, and the ultimate strain. Results indicate that bilayer h-BN nanosheets exhibit anisotropic characteristics, with their tensile properties decreasing as temperature increases. Additionally, we explore the influence of temperature on the natural frequency of bilayer h-BN under five different stacking modes. These results establish a fundamental understanding of the mechanical and vibrational characteristics of bilayer h-BN nanosheets under different stacking modes, contributing to their potential applications in advanced nanodevices operating in extremely high-temperature environments.
{"title":"Effect of temperature on tensile and vibration properties of bilayer boron nitride","authors":"Demin Zhao, Kexin Fang","doi":"10.1002/msd2.12093","DOIUrl":"https://doi.org/10.1002/msd2.12093","url":null,"abstract":"Hexagonal boron nitride (h-BN) is a semiconductor material with a wide band gap, holding promising potential for applications in thermal conductivity devices and nanoresonators in the field of microelectronics. Here, molecular dynamics is simulated to investigate the tensile and vibrational behaviors of bilayer h-BN under five different stacking modes across varying temperatures. The mechanical properties of five different stacking modes of h-BN at various temperatures are focused on, including Young's modulus, the ultimate stress, and the ultimate strain. Results indicate that bilayer h-BN nanosheets exhibit anisotropic characteristics, with their tensile properties decreasing as temperature increases. Additionally, we explore the influence of temperature on the natural frequency of bilayer h-BN under five different stacking modes. These results establish a fundamental understanding of the mechanical and vibrational characteristics of bilayer h-BN nanosheets under different stacking modes, contributing to their potential applications in advanced nanodevices operating in extremely high-temperature environments.","PeriodicalId":501255,"journal":{"name":"International Journal of Mechanical System Dynamics","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139056026","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}
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.
{"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}
{"title":"Launching ceremony of the International Society of Mechanical System Dynamics Convened in Beijing, China","authors":"Tong Zhang, Qinbo Zhou, Yanni Zhang, Hang Zhang","doi":"10.1002/msd2.12089","DOIUrl":"https://doi.org/10.1002/msd2.12089","url":null,"abstract":"","PeriodicalId":501255,"journal":{"name":"International Journal of Mechanical System Dynamics","volume":"37 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138952568","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}
Da Yu, Benqiang Yang, Kai Yan, Changsheng Li, Xiang Ma, Xiangyu Han, He Zhang, Keren Dai
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.
{"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}
Molecular dynamics (MD) simulation and orthotropic continuum model that considers interlayer shear are used to investigate the transverse deformation and free transverse vibration of multilayered rectangular molybdenum disulfide (MoS2). The interlayer shear effect is considered in the continuum model by considering the multilayered MoS2 as a continuous uniform orthotropic material. A method for obtaining mode shapes using a single thermal vibration MD simulation is proposed. The frequencies and mode shapes predicted using the orthotropic continuum model and MD simulation agree well. The mechanical problem of multilayered two-dimensional material plate resonator can be solved easily and efficiently by using the finite element method for the orthotropic continuum model.
{"title":"Orthotropic plate model for the vibration of multilayered molybdenum disulfide","authors":"Mingqian Li, Lifeng Wang","doi":"10.1002/msd2.12088","DOIUrl":"https://doi.org/10.1002/msd2.12088","url":null,"abstract":"Molecular dynamics (MD) simulation and orthotropic continuum model that considers interlayer shear are used to investigate the transverse deformation and free transverse vibration of multilayered rectangular molybdenum disulfide (MoS<sub>2</sub>). The interlayer shear effect is considered in the continuum model by considering the multilayered MoS<sub>2</sub> as a continuous uniform orthotropic material. A method for obtaining mode shapes using a single thermal vibration MD simulation is proposed. The frequencies and mode shapes predicted using the orthotropic continuum model and MD simulation agree well. The mechanical problem of multilayered two-dimensional material plate resonator can be solved easily and efficiently by using the finite element method for the orthotropic continuum model.","PeriodicalId":501255,"journal":{"name":"International Journal of Mechanical System Dynamics","volume":"44 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138521808","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}
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