Modeling and validation of preload force effect on characteristics of a V-shaped linear ultrasonic motor

2021 ◽  
pp. 1045389X2110386
Author(s):  
Lifeng Zhou ◽  
Zhiyuan Yao ◽  
Shichao Dai ◽  
Ying He ◽  
Xiaoniu Li
Keyword(s):  
Dynamic Model ◽  
Dynamic Behavior ◽  
Analytical Model ◽  
Dynamic Characteristics ◽  
Contact Surface ◽  
Dynamic Models ◽  
Ultrasonic Motor ◽  
Precise Control ◽  
Linear Ultrasonic Motor ◽  
Contact Mechanism

The traditional dynamic models of linear ultrasonic motor (LUSM) do not consider the influences of the preload force and the roughness of the contact surface of stator/slider on the performance of the motor, which unable to effectively describe the dynamic behavior of the motor. In this paper, a dynamic model is established for a V-shaped LUSM considering the influence of the preload force and the roughness of the contact surface of stator/slider on the dynamic behavior of the motor. The contact mechanism of the stator/slider and the influence of preload force on the stator parameters are studied and analyzed. The effectiveness of the developed model is verified by comparing with the analytical model that ignored the effect of the preload force on the stator parameters. The experimental results shown that the developed model can accurately reflect the dynamic characteristics of the motor, and the model will be helpful for the function prediction and precise control of the motor.

Research on mechanism configuration and dynamic characteristics for multi-split transmission line mobile robot

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Wei Jiang ◽  
Yating Shi ◽  
Dehua Zou ◽  
Hongwei Zhang ◽  
Hong Jun Li
Keyword(s):  
Mobile Robot ◽  
Transmission Line ◽  
Dynamic Model ◽  
Dynamic Characteristics ◽  
Transmission Lines ◽  
Dynamic Models ◽  
Working Environment ◽  
Joint Torque ◽  
Content Type ◽  
Working Space

Purpose The purpose of this paper is to achieve the optimal system design of a four-wheel mobile robot on transmission line maintenance, as the authors know transmission line mobile robot is a kind of special robot which runs on high-voltage cable to replace or assist manual power maintenance operation. In the process of live working, the manipulator, working end effector and the working environment are located in the narrow space and with heterogeneous shapes, the robot collision-free obstacle avoidance movement is the premise to complete the operation task. In the simultaneous operation, the mechanical properties between the manipulator effector and the operation object are the key to improve the operation reliability. These put forward higher requirements for the mechanical configuration and dynamic characteristics of the robot, and this is the purpose of the manuscript. Design/methodology/approach Based on the above, aiming at the task of tightening the tension clamp for the four-split transmission lines, the paper proposed a four-wheel mobile robot mechanism configuration and its terminal tool which can adapt to the walking and operation on multi-split transmission lines. In the study, the dynamic models of the rigid robot and flexible transmission line are established, respectively, and the dynamic model of rigid-flexible coupling system is established on this basis, the working space and dynamic characteristics of the robot have been simulated in ADAMS and MATLAB. Findings The research results show that the mechanical configuration of this robot can complete the tightening operation of the four-split tension clamp bolts and the motion of robot each joint meets the requirements of driving torque in the operation process, which avoids the operation failure of the robot system caused by the insufficient or excessive driving force of the robot joint torque. Originality/value Finally, the engineering practicability of the mechanical configuration and dynamic model proposed in the paper has been verified by the physical prototype. The originality value of the research is that it has double important theoretical significance and practical application value for the optimization of mechanical structure parameters and electrical control parameters of transmission line mobile robots.

Vertical Dynamic Impedance of Fracture Pile

2011 ◽  
Vol 250-253 ◽  
pp. 2221-2224
Author(s):  
Bin Yan ◽  
Li Tong Sun ◽  
Yao Xu
Keyword(s):  
Natural Disasters ◽  
Dynamic Model ◽  
Dynamic Behavior ◽  
Dynamic Characteristics ◽  
Single Fracture ◽  
Vertical Oscillation ◽  
Dynamic Impedance ◽  
The Individual

Some damages of piles can be unavoidably caused by natural disasters and extreme constructions. Usually, piles can be cut into two parts by shocks such as earthquakes, that is fracture piles. Obviously, the dynamic behavior of a single fracture pile is different from that of normal piles. But the problems of inspection, appraisal, repairs and maintenance of piles will face us. By studying dynamic behavior of a single fracture pile of vertical oscillation, the paper introduces a dynamic model of the fracture pile. The model is not perhaps perfect, but it is a method to begin to study the vibration of the fracture pile. The individual example does not detail the dynamic characteristics of the fracture pile, but the tendency of the curve of the dynamic impedance versus frequency can give a mainly rule.

Effect of Flexibility of Driving Shaft on the Dynamic Behavior of a Cam Mechanism

1975 ◽  
Vol 97 (2) ◽  
pp. 595-602 ◽  
Author(s):  
M. P. Koster
Keyword(s):  
Dynamic Response ◽  
Dynamic Model ◽  
Dynamic Behavior ◽  
Dynamic Models ◽  
Test Results ◽  
Dimensionless Parameters ◽  
Cam Mechanism

The flexibility of the driving shaft affects the dynamic behavior of a cam mechanism. On the basis of a dynamic model this effect can be determined theoretically. The results of different dynamic models are then compared with test results. The drawing up of rules concerning the design of cam mechanisms makes use of a model which is sufficiently accurate as well as sufficiently simple, so that the dynamic response can be characterized by merely two dimensionless parameters, one for the follower and one for the camshaft.

Effect of Friction on Dynamics of Gear System Featuring Confluence Transmission

2012 ◽  
Vol 163 ◽  
pp. 18-22 ◽  
Author(s):  
Hao Dong Gao ◽  
Yi Du Zhang ◽  
Xiang Sheng Gao
Keyword(s):  
Dynamic Model ◽  
Dynamic Behavior ◽  
Dynamic Characteristics ◽  
Periodic Motion ◽  
Gear System ◽  
Jump Phenomenon ◽  
Linear Dynamic ◽  
Non Linear ◽  
Gear Systems ◽  
The Impact

In order to investigate the effect of friction on gear system featuring confluence transmission, a non-linear dynamic model of three-gear system having two gear pairs was built. The influence of gear systems dynamic characteristics caused by changing of friction coefcient was researched. With the changing of friction coefcient, left-right gear pairs show dynamic behavior with coexist of same periodic motion, coexist of different periodic motion and chaos. With the increase of friction coefcient, the jump phenomenon of amplitude occurred, the impact of gear system became larger.

Modeling and Analysis of Electro Hydraulic Brake System Based on AMESim/Matlab

2011 ◽  
Vol 383-390 ◽  
pp. 1994-1999 ◽  
Author(s):  
Zhi Lin Jin ◽  
You Qun Zhao ◽  
Rui Kang Shi ◽  
Li Shu Guo ◽  
Zheng Tang Shi
Keyword(s):  
Dynamic Model ◽  
Dynamic Behavior ◽  
Dynamic Characteristics ◽  
Single Neuron ◽  
Active Safety ◽  
Modeling And Analysis ◽  
Hydraulic Brake ◽  
Working Principle ◽  
Single Neuron Pid ◽  
Vehicle Active Safety

Electro Hydraulic Brake (EHB) system plays an important role for improving vehicle active safety. In this paper, the dynamic behavior of EHB system is discussed. From its working principle, a dynamic model of quarter EHB system is established based on AMESim and Matlab. To analyze performance of the proposed EHB system, the strategy of Single-Neuron PID regulation is presented and a typical numerical case is given. The results show that this strategy can obtain good performance and proper parameters can improve the dynamic characteristics of EHB system effectively.

Application of the piecewise constant method in nonlinear dynamics of drill string

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jialin Tian ◽  
Jie Wang ◽  
Yi Zhou ◽  
Lin Yang ◽  
Changyue Fan ◽  
...  
Keyword(s):  
Nonlinear Dynamics ◽  
Dynamic Model ◽  
Dynamic Characteristics ◽  
Drill String ◽  
Vibration Velocity ◽  
Kutta Method ◽  
Time Step ◽  
Piecewise Constant ◽  
Runge Kutta Method ◽  
Runge Kutta

Abstract Aiming at the current development of drilling technology and the deepening of oil and gas exploration, we focus on better studying the nonlinear dynamic characteristics of the drill string under complex working conditions and knowing the real movement of the drill string during drilling. This paper firstly combines the actual situation of the well to establish the dynamic model of the horizontal drill string, and analyzes the dynamic characteristics, giving the expression of the force of each part of the model. Secondly, it introduces the piecewise constant method (simply known as PT method), and gives the solution equation. Then according to the basic parameters, the axial vibration displacement and vibration velocity at the test points are solved by the PT method and the Runge–Kutta method, respectively, and the phase diagram, the Poincare map, and the spectrogram are obtained. The results obtained by the two methods are compared and analyzed. Finally, the relevant experimental tests are carried out. It shows that the results of the dynamic model of the horizontal drill string are basically consistent with the results obtained by the actual test, which verifies the validity of the dynamic model and the correctness of the calculated results. When solving the drill string nonlinear dynamics, the results of the PT method is closer to the theoretical solution than that of the Runge–Kutta method with the same order and time step. And the PT method is better than the Runge–Kutta method with the same order in smoothness and continuity in solving the drill string nonlinear dynamics.

scholarly journals A novel linear ultrasonic motor with dual sliders

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025238
Author(s):  
Danhong Lu ◽  
Qiuxiang Lin ◽  
Yanxiang Han ◽  
Bingxun Chen ◽  
Chunrong Jiang ◽  
...  
Keyword(s):  
Ultrasonic Motor ◽  
Linear Ultrasonic Motor

Influence of the backlash generated by tooth accumulated wear on dynamic behavior of compound planetary gear set

2016 ◽  
Vol 231 (11) ◽  
pp. 2025-2041 ◽  
Author(s):  
Shijing Wu ◽  
Haibo Zhang ◽  
Xiaosun Wang ◽  
Zeming Peng ◽  
Kangkang Yang ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Dynamic Model ◽  
Dynamic Behavior ◽  
Planetary Gear ◽  
Tooth Wear ◽  
Transmission Error ◽  
Gear Transmission ◽  
Tooth Surface ◽  
Contact Ratio ◽  
The Impact

Backlash is a key internal excitation on the dynamic response of planetary gear transmission. After the gear transmission running for a long time under load torque, due to tooth wear accumulation, the backlash between the tooth surface of two mating gears increases, which results in a larger and irregular backlash. However, the increasing backlash generated by tooth accumulated wear is generally neglected in lots of dynamics analysis for epicyclic gear trains. In order to investigate the impact of backlash generated by tooth accumulated wear on dynamic behavior of compound planetary gear set, in this work, first a static tooth surface wear prediction model is incorporated with a dynamic iteration methodology to get the increasing backlash generated by tooth accumulated wear for one pair of mating teeth under the condition that contact ratio equals to one. Then in order to introduce the tooth accumulated wear into dynamic model of compound planetary gear set, the backlash excitation generated by tooth accumulated wear for each meshing pair in compound planetary gear set is given under the condition that contact ratio equals to one and does not equal to one. Last, in order to investigate the impact of the increasing backlash generated by tooth accumulated wear on dynamic response of compound planetary gear set, a nonlinear lumped-parameter dynamic model of compound planetary gear set is employed to describe the dynamic relationships of gear transmission under the internal excitations generated by worn profile, meshing stiffness, transmission error, and backlash. The results indicate that the introduction of the increasing backlash generated by tooth accumulated wear makes a significant influence on the bifurcation and chaotic characteristics, dynamic response in time domain, and load sharing behavior of compound planetary gear set.

Dynamics Characteristics for Contact Surface of Machine Tool

2014 ◽  
Vol 538 ◽  
pp. 91-94
Author(s):  
Wei Ping Luo
Keyword(s):  
Machine Tool ◽  
Dynamic Characteristics ◽  
Contact Surface ◽  
Dynamic Performance ◽  
Virtual Prototype ◽  
Prototype Model ◽  
Ansys Software ◽  
Dynamic Analyses ◽  
Contact Surfaces

A virtual prototype model of Machine Tool has been constructed by using the Pro/E software and the ANSYS software. Considering the effects of contact surfaces, dynamic analyses of Machine Tool are studied. The effects of contact surfaces on the dynamic characteristics of machine tool are studied. So that the purpose predicting and evaluating synthetically the machine tool dynamic performance without a physical sample can be achieved.

DYNAMIC BEHAVIOR OF TELESCOPIC CRANES BOOM

2013 ◽  
Vol 13 (01) ◽  
pp. 1350010 ◽  
Author(s):  
IOANNIS G. RAFTOYIANNIS ◽  
GEORGE T. MICHALTSOS
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Analytical Model ◽  
Constant Velocity ◽  
Steel Beam ◽  
Continuum Approach ◽  
Theoretical Formulation ◽  
Modal Superposition ◽  
Superposition Technique

Telescopic cranes are usually steel beam systems carrying a load at the tip while comprising at least one constant and one moving part. In this work, an analytical model suitable for the dynamic analysis of telescopic cranes boom is presented. The system considered herein is composed — without losing generality — of two beams. The first one is a jut-out beam on which a variable in time force is moving with constant velocity and the second one is a cantilever with length varying in time that is subjected to its self-weight and a force at the tip also changing with time. As a result, the eigenfrequencies and modal shapes of the second beam are also varying in time. The theoretical formulation is based on a continuum approach employing the modal superposition technique. Various cases of telescopic cranes boom are studied and the analytical results obtained in this work are tabulated in the form of dynamic response diagrams.

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