The Study on Dynamic Simulation of the Roller Gear Indexing Cam

2012 ◽  
Vol 503-504 ◽  
pp. 44-47
Author(s):  
Yan Song Liu ◽  
Wei He
Keyword(s):  
Optimal Design ◽  
Contact Mechanics ◽  
Dynamic Simulation ◽  
Dynamic Characteristics ◽  
High Speed ◽  
High Accuracy ◽  
New Method ◽  
Machining Accuracy ◽  
Body Dynamics ◽  
Multi Body

The roller gear indexing cam has irreplaceable superiority in the high-accuracy and high-speed indexing motion, but it can not keep the system’s good dynamic characteristics to improve machining accuracy of cam only. This paper studies the dynamic simulation of the roller gear indexing cam by means of virtual prototype technology, rigid multi-body dynamics, and contact mechanics, and the influences of this system’s parameters on dynamic responds of the mechanism. These works are valuable for designers, makers and users to optimal design, test, and make the mechanism, and give a new method for studying dynamics of roller gear indexing cam.

Stability Analysis and Optimal Design of High-Speed and High-Load Driving Mechanism With Joint Clearance Based on Multi-Body Dynamics

2013 ◽  
Author(s):  
Zenglei Zhang ◽  
Shijing Wu ◽  
Haibo Zhang ◽  
Jie Chen
Keyword(s):  
Optimal Design ◽  
Dynamic Characteristics ◽  
High Speed ◽  
High Load ◽  
Joint Clearance ◽  
Force Model ◽  
Driving Mechanism ◽  
Contact Method ◽  
Continuous Contact ◽  
Multi Body

High-speed and high-load driving mechanism with joint clearance presents strong nonlinear features which affects the dynamic characteristics of the mechanism. A single-degree-of-freedom multi-body model, including nine connecting links, three translation joints and ten revolute joints with clearance, is built with the continuous contact method based on research of dynamics theory about joint clearance. Furthermore, normal forces are calculated with a nonlinear continuous contact force model and tangential forces are calculated with the modified Coulomb friction model to simulate process of contact and collision. When the model is solved according to real operating condition, the results are compared with that of the model with ideal joints, finding that revolute joint clearance will create effects on velocity and especially great effects on acceleration of the driving mechanism. Moreover, different amounts and different sizes of the clearance are considered to research the influence on dynamic characteristics of the driving mechanism. Meanwhile, methods of optimal design are explored according to the parametric analysis computing results. Simulation methods and findings can act as guidance for further study of optimal design for high-speed and high-load driving mechanisms to reduce the negative effects of joint clearance.

Development of High-Speed Response Electromagnetic Linear Actuator Using for Pneumatic Control Valve

2014 ◽  
Vol 532 ◽  
pp. 41-45 ◽  
Author(s):  
Myung Jin Chung
Keyword(s):  
Optimal Design ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Design Method ◽  
Control Valve ◽  
Design Parameters ◽  
Linear Actuator ◽  
Analytic Model ◽  
Electromagnetic Linear Actuator ◽  
Quadratic Programming Method

Analytic model of electromagnetic linear actuator in the function of electric and geometric parameters is proposed and the effects of the design parameters on the dynamic characteristics are analyzed. To improve the dynamic characteristics, optimal design is conducted by applying sequential quadratic programming method to the analytic model. This optimal design method aims to minimize the response time and maximize force efficiency. By this procedure, electromagnetic linear actuator having high-speed characteristics is developed.

Analysis and Research of Dynamic Characteristics of Synchronous Belt of a Diesel Using Multi-Body Dynamics

2011 ◽  
Vol 97-98 ◽  
pp. 721-725
Author(s):  
Yi Min Li ◽  
Zhi Yong Hao ◽  
Jin Li
Keyword(s):  
Dynamic Characteristics ◽  
Great Influence ◽  
Dynamic Tension ◽  
Timing Drive ◽  
Body Dynamics ◽  
Timing System ◽  
Speed Fluctuation ◽  
The One ◽  
Transversal Vibrations ◽  
Multi Body

The dynamic tension of synchronous belt and pulleys forces are obtained by analyzing the dynamic characteristics of timing drive system of a diesel based on muti-body dynamics. The effects of crankshaft speed fluctuation and other excitations on the dynamics characteristics of synchronous belt are illustrated. After the analysis, it is found that crankshaft speed fluctuation has a great influence on the linear and transversal vibrations of synchronous belt. Comparing the simulation results of the original timing system and the one optimized, it is found that the modal frequency of synchronous belt depends on its span. Therefore it is important to control the span of belt and arrange the tensioner pulley properly for timing system design.

Simulation Analysis and Structure Optimum Design of the High Speed Conveying Manipulator Based on ADAMS

2014 ◽  
Vol 945-949 ◽  
pp. 121-126 ◽  
Author(s):  
Feng Wei Xue ◽  
Ji Ping Zhou
Keyword(s):  
Production Line ◽  
High Speed ◽  
Design Theory ◽  
Simulation Analysis ◽  
Structural Characteristics ◽  
Transmission System ◽  
Manufacturing Cost ◽  
Body Dynamics ◽  
Virtual Prototyping Technology ◽  
Multi Body

The conveying manipulator is an indispensable transmission system of JM31-160 automatic stamping production line, and structural characteristics of the manipulator directly affect the productivity of auto stamping production line. Using virtual prototyping technology, basing on the Multi-body dynamics theory, explored the technical line of dynamic design theory to apply on the transmission system. Reaching a conclusion the function of optimized structure is improved, and manufacturing cost brings down.

A New Method of Reducing Shock between Press Head and Press Disk in High Speed Lapping

2007 ◽  
Vol 24-25 ◽  
pp. 145-148 ◽  
Author(s):  
J.D. Yang ◽  
C.L. Tian ◽  
H.Y. Yang ◽  
Z.Q. Hao ◽  
Z.H. Zhu
Keyword(s):  
High Speed ◽  
New Method ◽  
Machining Accuracy ◽  
Working Pressure ◽  
The Press ◽  
Air Cushion

Considering the shock between the press head and press disk in high speed lapping is more serious, this paper proposes a new method to reduce this shock. By this method a hole is machined for air passing on the press head axis. The topper of the hole is connecting with a pressure air resource. Thus an air cushion between the press head bottom and press disk on the workpiece is produced. With the distance between them reducing gradually, the damping of air cushion on the press head increases gradually. This makes speed of the press head approaching the workpiece decrease gradually and until reach zero. The pressure of the press head acts on the press disk increases gradually from zero to working pressure, which can reduce the shock between the press head and workpiece effectively, prevent weak workpiece from destroying in lapping and improve machining accuracy and quality. This method possess the advantages of easy to carry out, simple to operate and convenient to apply.

scholarly journals Evaluation of Joint Driving Torque and Finite Element Analysis in Articulate Robot through the simulation of Multi-Body Dynamics

2019 ◽  
Vol 8 (11) ◽  
pp. 682-686
Keyword(s):  
Experimental Data ◽  
Structural Analysis ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Simulation Software ◽  
Analysis Software ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
Articulated Robots ◽  
Multi Body

Interest in high-speed articulated robots is increasing for product productivity expansion. High-speed articulated robots operate with rapid acceleration/deceleration moves, requiring dynamic characteristic analysis in the robot designing process. For this dynamic behavior analysis, simulation software is utilized, which supports product design verification and parts optimization. In analyzing the dynamic characteristics using the software, loading conditions can be obtained from experimental data or parts’ material characteristics. In a special case where data or experimental data on load conditions are hardly obtainable, multibody dynamics software is utilized. However, it is not easy to define an effective load and boundary conditions for systems with kinetically complicated connections. In order to solve such a problem, this present study investigated how to apply to structural analysis software the dynamic load found using dynamics and structural analysis software. In addition, the dynamic characteristics of high-speed articulated robots and robot link were assumed as a rigid body in implementing the dynamics analysis and structural analysis.

Safety of a high-speed train passing by a windbreak breach under different wind speeds

2021 ◽  
pp. 095440972110460
Author(s):  
Zhuang Sun ◽  
Syeda Anam Hashmi ◽  
Huanyun Dai ◽  
Guiyu Li
Keyword(s):  
High Speed ◽  
Navier Stokes ◽  
Windward Side ◽  
High Speed Train ◽  
Wind Speeds ◽  
Pressure Fields ◽  
Body Dynamics ◽  
Multi Body ◽  
Yaw Angle ◽  
Moving Train

A derailment phenomenon could take place on the windward side of a 120 km/h high-speed train when it runs by a breach, between two windbreak walls, subjected to a normal wind speed of 32 m/s. To study the safety of a high-speed train under different normal speeds of crosswind, six wind speeds are investigated; 32 m/s, 28 m/s, 25 m/s, 20 m/s, 15 m/s, and 10 m/s. The wind forces and moments of the moving train are calculated using the Unsteady Reynolds-averaged Navier-Stokes (URANS) model, which are then applied to the train multi-body dynamics. The pressure fields around the train passing by the breach are analysed, which gives a reasonable explanation for the fluctuation of the wind loads. After an analysis on the response of the train, it is apparent that the risk of derailment on the windward side is much greater than the risk of overturning. The lateral distance of the first wheelset increases towards the windward side as along with the yaw angle of the wheelset, which increases as well with wind speeds of higher than 20 m/s.

Multi-Body Dynamics Analysis of Anti-Backlash Gear System Based on ADAMS/ Flex

2014 ◽  
Vol 971-973 ◽  
pp. 1261-1265
Author(s):  
Yu Jun Cao ◽  
Nai Hui Yu ◽  
Zheng Yang ◽  
Jian Zhong Shang
Keyword(s):  
Dynamic Characteristics ◽  
Coupling Model ◽  
Gear System ◽  
Dynamics Analysis ◽  
Simulation Accuracy ◽  
Flexible Coupling ◽  
Torsion Spring ◽  
Body Dynamics ◽  
Rigid Model ◽  
Multi Body

Anti-backlash gear can improve the static transmission precision of system. Besides, the dynamic characteristics of anti-backlash gear system have a significant effect on the performance of overall mechanism, and the torsion spring preload of anti-backlash gear is an important factor to affect the dynamic characteristic. In order to study dynamic characteristics of the anti-backlash gear, a rigid-flexible coupling model of single-stage anti-backlash system was established based on ADAMS / Flex, and the simulation accuracy was compared with the pure rigid model. The effect of the torsion spring preload on frequency response of the anti-backlash system was studied by virtual sweep experiments.

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