Volume 5: Dynamics, Vibration, and Control最新文献_第3页

Generating Multi-Pixel Thermal Images Through an Acousto-Thermal Effect 通过声热效应生成多像素热图像

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-96691

Teng Li, Jiali Li, Luyu Bo, Zhenhua Tian

{"title":"Generating Multi-Pixel Thermal Images Through an Acousto-Thermal Effect","authors":"Teng Li, Jiali Li, Luyu Bo, Zhenhua Tian","doi":"10.1115/imece2022-96691","DOIUrl":"https://doi.org/10.1115/imece2022-96691","url":null,"abstract":"\u0000 In this study, we attempted to systematically integrate the acousto-thermal effect and acoustic holography to explore the feasibility of generating controlled thermal fields in a tissue-mimicking material. To enable this capability, our method firstly generates multiple acoustic focal points by using an acoustic hologram-based lens and then constructs a thermal field with multiple elevated-temperature areas based on the acousto-thermal effect. To design the acoustic lens, multiple points are distributed on a constraint plane, which is used as the input for determining the desired phase map based on an iterative phase propagation approach. To characterize the performance of our hologram for generating an acoustic field with concentrated energy at multiple points, on one hand, numerical simulations were performed. On the other hand, experiments were performed by using a 3D printed hologram to generate multiple acoustic focal points and further enable the acousto-thermal effect at multiple target locations of a phantom slice. The thermal image recorded by an infrared camera shows multiple elevated-temperature areas. Moreover, the locations of these elevated-temperature areas agree with the locations of acoustic focal points. We expect this study can contribute to the noncontact control of thermal fields for biomedical applications.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116039313","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

A Reformulated Transfer Matrix Method for the Dynamic Response of Multistep Euler-Bernoulli and Timoshenko-Ehrenfest Beams 多阶欧拉-伯努利梁和Timoshenko-Ehrenfest梁动力响应的一种重新表述的传递矩阵法

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-95959

D. Segalman, Firas A. Khasawneh

{"title":"A Reformulated Transfer Matrix Method for the Dynamic Response of Multistep Euler-Bernoulli and Timoshenko-Ehrenfest Beams","authors":"D. Segalman, Firas A. Khasawneh","doi":"10.1115/imece2022-95959","DOIUrl":"https://doi.org/10.1115/imece2022-95959","url":null,"abstract":"\u0000 Stepped beams constitute an important class of engineering structures whose vibration response has been widely studied. Many of the existing methods for studying stepped beams manifest serious numerical difficulties as the number of segments or the frequency of excitation increase. In this paper, we focus on the Transfer Matrix Method (TMM), which provides a simple and elegant formulation for multi-step beams. The main idea in the TMM is to model each step in the beam as a uniform element whose vibration configurations are spanned by the segment’s local eigenfunctions. Utilizing these local expressions, the boundary conditions at the ends of the multi-step beam as well as the continuity and compatibility conditions across each step are used to obtain the nonlinear eigenvalue problem. Also, and perhaps more importantly, we provide a reformulation for multi-step Euler-Bernoulli beams that avoids much of the numerical singularity problems that have plagued most of the earlier efforts. When this reformulation is extended to multi-segment Timoshenko beams, the numerical difficulties appear to be mitigated, but not solved.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125487656","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

Mathematical Modeling of a Piezo-Actuated Cantilever Beam With Interferometer Feedback 带干涉仪反馈的压电驱动悬臂梁的数学建模

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-95819

J. Kochavi, S. Xing

{"title":"Mathematical Modeling of a Piezo-Actuated Cantilever Beam With Interferometer Feedback","authors":"J. Kochavi, S. Xing","doi":"10.1115/imece2022-95819","DOIUrl":"https://doi.org/10.1115/imece2022-95819","url":null,"abstract":"\u0000 Laser interferometry, commonly used in high-precision motion control systems, is rarely adopted in experimental vibration analysis because their installation and mounting are invasive to dynamical systems. However, new technology in high-precision manufacturing, such as vibration-assisted machining, has shown the meaningfulness of using laser interferometers implemented in motion control systems for vibration analysis, system identification, and feedback control. To this end, this study investigates the use of laser interferometry for vibration analysis through a piezoelectrically actuated cantilever beam. The complete dynamics of the cantilevered beam with a piezoelectric actuator and a laser interferometer is modeled through the Euler-Bernoulli beam theory. Through the method of separation of variables, the original continuous system is transformed into a discrete system represented in a state-space form. The response of the beam is analytically predicted, then compared with the numerical result from a multibody model constructed in Simscape. The frequency response at the retroreflector is obtained through the Laplace transformation of the state-space form. It is found that the first modal frequencies from analytical prediction precisely agree with their experimental counterpart.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127817401","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

Nonlinear Dynamics of a Planar Mechanism With Cam and Clearance 带凸轮和间隙的平面机构的非线性动力学

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-94873

L. S. Yousuf, D. Marghitu

引用次数: 0

Actively Controlled Magnetic Bearing System Using Compliant Mechanism 采用柔性机构的主动控制磁轴承系统

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-96233

Vivek Chaudhary, S. Pandey, J. P. Khatait, Shubhabrata Mukherjee

{"title":"Actively Controlled Magnetic Bearing System Using Compliant Mechanism","authors":"Vivek Chaudhary, S. Pandey, J. P. Khatait, Shubhabrata Mukherjee","doi":"10.1115/imece2022-96233","DOIUrl":"https://doi.org/10.1115/imece2022-96233","url":null,"abstract":"\u0000 Rotors with speeds more than 20000 rpm, like Flywheel Energy Storage System (FESS), are fully or partially evacuated to reduce drag but have to be geometrically constrained except in the rotation axis. Magnetic bearings are preferred over a rolling element or journal bearings. The high-speed rotor is supported on active magnetic bearings. Though magnetic bearings with multi-axis support are possible, we look at building the support using desired passive compliance along five DOFs and one contactless support using a magnetic field with high stiffness at the set gap. A single DOF active magnetic bearing system is designed to precisely position a shaft along the longitudinal direction. The shaft is supported on a pair of compliant ortho-planar mechanisms at the two ends. The compliant structure is designed to provide bearing support along the radial directions. The position of the shaft along the longitudinal direction is actively controlled using the magnetic bearing system. A two-unit system based on magnetic attraction, one at either end, is designed. A candidate compliant ortho-planar mechanism is designed to support the shaft and fabricated using rapid prototyping. Stresses and bearing stiffness along different axes are calculated and analyzed using FEM. The 3D printed part was used for visualization and tested for compliance in the active magnetic bearing direction. The active magnetic bearing system is modeled. The controller will be optimized for disturbance rejection and minimize excursion around a desired axial location. The developed setup can be used to study and develop multi-axis AMB for high-speed rotating applications.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133683735","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

On the Stability Analysis of a Double-Link Inverted Pendulum Subject to an Oscillatory Tilted Excitation 摆动倾斜激励下双连杆倒立摆的稳定性分析

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-94636

Babak Taherian, P. Shankar

{"title":"On the Stability Analysis of a Double-Link Inverted Pendulum Subject to an Oscillatory Tilted Excitation","authors":"Babak Taherian, P. Shankar","doi":"10.1115/imece2022-94636","DOIUrl":"https://doi.org/10.1115/imece2022-94636","url":null,"abstract":"\u0000 This paper presents the study of the stability characteristics of a two-link (double) inverted pendulum system subject to a tilted and oscillatory excitation at the bottom pivot. Each of the two links are assumed to have a concentrated point mass at their ends. The excitation force acts at the bottom of the first link and its amplitude, frequency and tilt angle can be varied. The system is also assumed to have very light damping between the two links. Euler-Lagrange formulation is used to develop the equations of motion of the double-link inverted pendulum which results in a non-autonomous dynamic system. The method of multiple timescales is implemented to convert it to an autonomous system which allows for determination of the equilibrium points. Bifurcation analysis of the damped and undamped system with respect to frequency and amplitude of the input excitation is performed using a continuation analysis software. Further, the evolution of the equilibrium points and their stability properties of the system using extensive Monte-Carlo simulation of the nonlinear system as several parameters such as damping coefficient, excitation frequency and tilt angle are varied is presented.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131642891","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

Research on a New Analysis Method of Traction Performance for Variable-Diameter Wheels 变直径车轮牵引性能分析新方法研究

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-94967

Wen Zeng, Huiyan Jiang, Guoyan Xu, F. Gao

{"title":"Research on a New Analysis Method of Traction Performance for Variable-Diameter Wheels","authors":"Wen Zeng, Huiyan Jiang, Guoyan Xu, F. Gao","doi":"10.1115/imece2022-94967","DOIUrl":"https://doi.org/10.1115/imece2022-94967","url":null,"abstract":"\u0000 Folded variable-diameter wheels used in planetary rovers can save spacecraft volume. Moreover, they can be expanded to improve their mobility on soft soil. However, only a single wheel foot was considered in previous researches on wheel-terrain interaction, which may be inaccurate. Hence, the cycloid motion equations for an unfolded variable-diameter wheel were introduced to obtain the shear displacement of any point on a wheel foot. Then, determining wheel-soil interaction regions was transformed into geometric relationship analysis. Therefore, the simplified model with a single wheel foot was established. Consequently, the traction efficiency achieved the peak when the range of wheel slip rates was 0.15∼0.35. The results shown that increased wheel diameter improved wheel mobility. For a greater sinkage, with the superposition of simplified model, the detailed model based on multiple wheel feet was built. This model got closer to real interaction status. The finite element analysis (FEA) results for the rolling wheel on soft soil were consistent with the theoretical hypotheses. Overall, the simplified model is very efficient, however, the detailed model is more accurate, which provides theoretical references for the control of optimizing wheel mobility. Additionally, this new analysis method developed here can also be applied to other expandable wheels.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"125 24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123039909","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: 1

Darrieus Wind Turbines With Twisted Blades 带有扭曲叶片的Darrieus风力涡轮机

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-94124

Yashkumar Rameshbhai Sutariya, Honghe Zhou

{"title":"Darrieus Wind Turbines With Twisted Blades","authors":"Yashkumar Rameshbhai Sutariya, Honghe Zhou","doi":"10.1115/imece2022-94124","DOIUrl":"https://doi.org/10.1115/imece2022-94124","url":null,"abstract":"\u0000 Darrieus wind turbines are lift-type vertical axis wind turbines. They have merits of simple structure and construction, easy installation and maintenance. Darrieus wind turbines can capture wind from any direction and convert it into electric power. They do not need any yaw mechanism to adjust their orientations in order to make their rotors face wind direction. Because of their lift-type, the power conversion efficiency is relatively high compared with drag-type vertical axis wind turbines like Savonius wind turbines. Although the merits of Darrieus wind turbines are remarkable, they also have their demerits. Compared with other types of vertical axis wind turbines, Darrieus wind turbines have relatively low static torque that weakens their self-starting capability. This research is motivated by surmounting the disadvantages facing Darrieus wind turbines. The research objective is focused on improving Darrieus wind turbines’ static and dynamic performance. In this research, Darrieus wind turbines with different blade shapes and numbers are simulated. The effects of the design parameters on the performance of Darrieus wind turbines are analyzed. Darrieus wind turbines are designed based on their geometric parameters to improve their performance. The results from this research will help the development and promotion of Darrieus wind turbines.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115176468","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 Number of Contact Points on the Fretting Wear Estimation of a Frictionally Damped Blade Platform 接触点数对摩擦阻尼叶片平台微动磨损估算的影响

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-95653

Aykut Cardak, E. Cigeroglu

{"title":"Effect of Number of Contact Points on the Fretting Wear Estimation of a Frictionally Damped Blade Platform","authors":"Aykut Cardak, E. Cigeroglu","doi":"10.1115/imece2022-95653","DOIUrl":"https://doi.org/10.1115/imece2022-95653","url":null,"abstract":"\u0000 Frictional interfaces, which induce energy dissipation in the system, are intentionally included in bladed disk system of gas turbine engines. By this way, resonant amplitude of the blade is decreased while high cycle fatigue failure of these structures is postponed. Mathematical modeling of the problem becomes complicated due to the nonlinear nature of the frictional contact which also adds difficulty to the solution of the problem. Time domain solution methods are expensive compared to frequency domain method for the determination of steady state response of nonlinear systems. Therefore, Harmonic Balance Method (HBM) is employed to constitute the set of algebraic equations to be solved numerically. Alternating Frequency Time (AFT) Method is utilized to find the Fourier coefficients of the friction force in an iterative way. In addition, analytical Jacobian formulation is implemented to the friction model to enhance the solution performance. Although various friction dampers have been designed, mathematically modeled, and discussed before, fretting wear which is the inevitable outcome of the dry friction is underemphasized up until today. In this work, a blade platform system which represents a simplified underplatform damper is studied to investigate the effect of number of macroslip friction elements on wear estimation and the effect of wear on the dynamic response of the system.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125827935","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

Dynamic Modelling of a 4WD/4WS Ground Vehicle by Using Gibbs-Appell Approach 基于Gibbs-Appell方法的4WD/4WS地面车辆动力学建模

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-95436

Pius E. Pius, M. Selekwa

{"title":"Dynamic Modelling of a 4WD/4WS Ground Vehicle by Using Gibbs-Appell Approach","authors":"Pius E. Pius, M. Selekwa","doi":"10.1115/imece2022-95436","DOIUrl":"https://doi.org/10.1115/imece2022-95436","url":null,"abstract":"\u0000 Although most wheeled robotic ground vehicles are either skid steered or differentially steered, there has been an increased interest in four independently driven all-wheel steering systems because of their torque density and maneuverability in tight turns. Controlling these vehicles requires coordination of the steering angles and wheel speeds such that the basic rigid body kinematic constraint on the instantaneous center of rotation (ICR) is satisfied. This makes them difficult to control except for simple cases where either the center of curvature for all turns is constrained to be along the perpendicular bisector to the longitudinal centerline of the vehicle or considerable wheel slippage is allowed to happen. Several efforts have been reported to address this problem, most of which tend to simplify the problem by extending the well-known bicycle model to these vehicles. This paper uses the Gibbs-Appel formulation to develop the equations of motion of a 4WD/4WS vehicle in the quasi-coordinate space while enforcing both the ICR and no slip constraints. Unlike the Lagrange-Euler and the Newton-Euler formulations that use Lagrange multipliers to handle constraints, which increases the dimension of the system, the Gibbs-Appell formulation results in a model of a relatively lower dimension. This model is not only easy to use in control design but also captures the dynamics of the vehicle by constraining the wheels to remain on the path. Simulation results using a simple feedback linearization controller showed the vehicle tracking the path more accurately without wheel slip where the wheels remained on the path all times.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125914305","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