Volume 5: Dynamics, Vibration, and Control最新文献_第6页

Multiple Flexoelectric Actuation and Control of Plates 多柔性电驱动与板的控制

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-94908

Xinyu Yang, Jie Zhang, Mu Fan

{"title":"Multiple Flexoelectric Actuation and Control of Plates","authors":"Xinyu Yang, Jie Zhang, Mu Fan","doi":"10.1115/imece2022-94908","DOIUrl":"https://doi.org/10.1115/imece2022-94908","url":null,"abstract":"\u0000 Flexoelectric effect is a novel electro-mechanical coupling effect that has drawn a lot of attention in the past few decades. Compared with piezoelectric materials, flexoelectric materials have the inherent characteristics of gradient coupling effect between electric field and elastic field. Since no complex pre-polarization process is required, the flexoelectric materials do not have depolarization or aging problems during the trial period. Similar to piezoelectricity, flexoelectricity exhibits two different effects: direct and converse flexoelectric effect. The direct flexoelectric effect indicates that the strain gradient produces an electrical response, and can be used in sensor design and energy harvesting. The converse flexoelectric effect represents mechanical stress or strain caused by inhomogeneous electric field or polarization gradient, and then as a response, the induced membrane force and the corresponding control moment will occur in the structure.\u0000 This study will take the mechanic electric coupling characteristics of flexoelectric effect as the core, establish the dynamic equation, deduce the modal response of plate structure under the effect of flexoelectric and obtain the relationship between modal response and electric field gradient. To validate the theoretical method, a finite element model of flexoelectric actuated plate will be established in the commercial software COMSOL Multiphysics. With no existing flexoelectric module, the finite element model of flexoelectric plate will be built based on the original dynamic model. A non-uniform electric field is firstly constructed in COMSOL with the electrostatic module. The influence of different structural parameters on the vibration control effect caused by flexoelectric excitation will be analyzed and optimized, which will provide a theoretical basis for the application of flexoelectric materials in the vibration control of novel smart structures.","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":"130846007","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

Dynamics of Periodic Sandwich Beams 周期性夹层梁动力学

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-94730

E. Farzaneh Joubaneh, Jihong Ma

引用次数: 0

Natural Frequency and Mode Shape of a Shaft With Elastically Mounted Rotary Inertia From Governing Equations With Dirac Delta Function 由狄拉克函数控制方程求具有弹性转动惯量的轴的固有频率和模态振型

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-94759

P. Hassanpour

引用次数: 0

Using Actor-Critic Reinforcement Learning for Control and Flight Formation of Quadrotors 四旋翼机控制与编队飞行的actor - critical强化学习

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-97224

Edgar Torres, Lei Xu, Tohid Sardarmehni

引用次数: 0

Design and Development of a Fish-Like, Soft Biomimetic Robot 一种仿鱼软仿生机器人的设计与研制

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-94635

N. Pai, Andrea Contreras Esquen, C. Tekes, Amir Ali Amiri Moghadam, A. Tekes

{"title":"Design and Development of a Fish-Like, Soft Biomimetic Robot","authors":"N. Pai, Andrea Contreras Esquen, C. Tekes, Amir Ali Amiri Moghadam, A. Tekes","doi":"10.1115/imece2022-94635","DOIUrl":"https://doi.org/10.1115/imece2022-94635","url":null,"abstract":"\u0000 Among the robotic systems, biomimetic robots performing fish-like locomotion have been the focus of much attention recently as there are many applications for swimming robots, including monitoring of underwater environments, detection of pollution, and disaster relief. This study presents the design and development of a biomimetic fish-like robot based on real carp locomotion. The robot has five main body parts including the head, soft neck, hinged body, compliant tail, and caudal fin. The head houses three ultrasonic sensors to guide the robot while connected to the body through two degrees of freedom (DOF) soft link resembling the neck vertebrate. The 2 DOF soft link enables the head to bend up, down, left, and right which is essential for controlling the soft robot’s direction. The body is connected to the soft tail using a quick return crank mechanism to actuate the tail. The tail integrates a soft tail and a rigid caudal fin. While all parts of the soft fish-like robot are 3D printed using polylactic acid (PLA), thermoplastic polyurethane (TPU), the mold is made from silicone rubber to waterproof. The ultrasonic sensors are utilized to detect obstacles so that the robot may maneuver around. The swimming pattern only for two-dimensional motion is tested in the air and underwater. According to the experimental results, the proposed robot better imitates the fish through its soft 2 DOF link and tail.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"32 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":"126944388","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

Self-Powered Wireless Sensor for Risk Assessment: Characterization and Implementation 用于风险评估的自供电无线传感器:特性和实现

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-91050

Ghufran Aldawood, H. Bardaweel

引用次数: 0

Gravity Impact on Post-Resonance Backward Whirl Excitation by the Nonsynchronous Whirl 非同步涡旋对共振后反向涡旋激励的重力影响

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-95344

Rafath Abdul Nasar, Mohammad A. AL-Shudeifat

引用次数: 0

Influence of Surface Roughness on Heat Transfer and Flow-Induced Vibrations of a Circular Cylinder 表面粗糙度对圆柱传热及流激振动的影响

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-94962

Ussama Ali, Md. Islam, I. Janajreh

{"title":"Influence of Surface Roughness on Heat Transfer and Flow-Induced Vibrations of a Circular Cylinder","authors":"Ussama Ali, Md. Islam, I. Janajreh","doi":"10.1115/imece2022-94962","DOIUrl":"https://doi.org/10.1115/imece2022-94962","url":null,"abstract":"\u0000 In this study, two-dimensional numerical analysis was done to investigate the influence of surface roughness on the heat transfer and flow characteristics for a circular cylinder subjected to crossflow. Numerical solution of the URANS and energy equation was sought using Ansys Fluent for the transient analysis at Reynolds number of 100. The roughness was induced in the cylinder surface by considering the sand surface roughness model. Four levels of roughness were studied with the roughness coefficient (Ks/D) varying between 0.01 and 0.06. The cylinder was allowed to move in transverse as well as streamwise direction to study the two-degree of freedom motion. The reduced velocity was varied in the range of 1–10, covering the region with maximum amplitude of vibration. The cylinder was heated at 300°C above the freestream fluid temperature. The numerical model was validated with the results from the literature. The analysis was done in terms of vorticity and temperature contours, Nusselt number, Strouhal number, and lift and drag coefficients. The results indicated that the surface roughness affected the flow characteristics and heat transfer in such a way that Strouhal number increased, while the lift and drag coefficients and Nusselt number decreased with the increase in the surface roughness. However, the effect of Nusselt number was much higher in comparison to the effect on the Strouhal number and lift and drag coefficients.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"37 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":"132022913","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: 2

Control of Flight Vehicles From the Perspective of Non-Holonomic Constraint Manifold Dynamics: Quadrotor Application 基于非完整约束流形动力学的飞行器控制:四旋翼飞行器的应用

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-95040

Ambika P. Dahal, A. Barhorst

{"title":"Control of Flight Vehicles From the Perspective of Non-Holonomic Constraint Manifold Dynamics: Quadrotor Application","authors":"Ambika P. Dahal, A. Barhorst","doi":"10.1115/imece2022-95040","DOIUrl":"https://doi.org/10.1115/imece2022-95040","url":null,"abstract":"\u0000 In this paper, we address the problem of flight path planning and control. We approach the problem from the perspective of non-holonomic generalized momenta. We first build a desired minimum Jerk trajectory that we use as a momentum manifold constraint for the vehicle. We then develop a trajectory reference model of the flight vehicle that evolves exactly on the flight path as a constraint, as if the vehicle were a bead on a wire in the generalized coordinate configuration space. This model uses non-holonomic generalized momenta and position and orientation variables as states, the model is of order 2N – M, where N is the full dimension of the vehicle model and M is the number of manifold constraints imposed. These momenta models are canonical without Lagrange Multipliers. Next, we build a full 2N order model of the flight vehicle and design an LQR controller linearized about nominal path independent flight. We then implement this control in the full flight model and use as the reference state trajectory the constrained momentum states computed on the desired flight path. We allow inflight disturbances. We demonstrate that this approach provides good performance for a Quadrotor flight vehicle.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"21 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":"131396556","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 Simulation of Stress Concentration Factor of Pear Cam and Roller Follower Mechanism With Clearance 带间隙的梨形凸轮-滚子从动件机构应力集中系数的非线性动力学仿真

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI: 10.1115/imece2022-94728

L. S. Yousuf

{"title":"Nonlinear Dynamics Simulation of Stress Concentration Factor of Pear Cam and Roller Follower Mechanism With Clearance","authors":"L. S. Yousuf","doi":"10.1115/imece2022-94728","DOIUrl":"https://doi.org/10.1115/imece2022-94728","url":null,"abstract":"\u0000 The effect of stress concentration factor on the nonlinear dynamics phenomenon of the follower is studied at different internal distance of the follower guides from inside (I.D.) and different cam speeds (N). The stress concentration factor is examined at the contact point and around the square grooving key. The contact between the cam and the follower and between the follower and its guides are considered using SolidWork program. Three different involutes’ profiles of the pear cam are used to select the optimum cam profile. Phase-plane diagram is used to detect the periodic and non-periodic motions over times. Moreover, the dynamic tool of Wolf algorithm code is used to calculate the local Lyapunov exponent against number of samples. The overshoot of the transient response of local Lyapunov exponent parameter is done at different cam speeds and different follower guides’ clearances. Photo-elastic device is used to check the value of stress concentration factor experimentally. Multi spring-damper-mass model is used on the follower stem to reduce the contact stress at the contact point and around the square grooving key.","PeriodicalId":302047,"journal":{"name":"Volume 5: Dynamics, Vibration, and Control","volume":"47 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":"114939291","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