Kinematic analysis of multi-link mechanical press based on rigid-flexible coupling model

2016 ◽  
Author(s):  
Shu-Sheng Wang ◽  
Jing-Lin Yao ◽  
Xin-Guo Zhang ◽  
Xiang Zheng
Keyword(s):  
Kinematic Analysis ◽  
Coupling Model ◽  
Flexible Coupling ◽  
Mechanical Press

Dynamic Characteristic Analysis of Irregularity under Turnout by Vehicle-Turnout Rigid-Flexible Coupling Model

2014 ◽  
Vol 945-949 ◽  
pp. 591-595 ◽  
Author(s):  
Meng Chen ◽  
Yan Yun Luo ◽  
Bin Zhang
Keyword(s):  
Finite Element ◽  
Longitudinal Direction ◽  
Element Model ◽  
Vertical Displacement ◽  
Coupling Model ◽  
Interaction Force ◽  
Vertical Acceleration ◽  
Characteristic Analysis ◽  
Flexible Coupling ◽  
Multi Body

Finite element model of track in frog zone is built by vehicle-turnout system dynamics. Considering variation of rail section and elastic support, bending deformation of turnout sleeper, spacer block and sharing pad effects, the track integral rigidity distribution in longitudinal direction is calculated in the model. Vehicle-turnout rigid-flexible coupling model is built by finite element method (FEM), multi-body system (MBS) dynamics and Hertz contact theory. With the regularity solution that different stiffness is applied for rubber pad under sharing pad of different turnout sleeper zone, analysis the variation of vertical acceleration of bogie and wheelset, rail vertical displacement and wheel-rail interaction force, this paper proves that setting reasonable rubber pad stiffness is an efficient method to solve rigidity irregularity problem.

SDAMP: Software for the Design and Analysis of Mechanical Presses

2000 ◽  
Author(s):  
Herbert E. Stumph ◽  
Andrew P. Murray
Keyword(s):  
Kinematic Analysis ◽  
Kinematic Synthesis ◽  
Link Mechanism ◽  
Mechanical Press ◽  
Analysis And Synthesis ◽  
Drag Link ◽  
Mechanism Kinematic ◽  
Functioning Mechanism

Abstract In this paper we introduce the MATLAB-based SDAMP (pronounced stamp) software for the analysis and synthesis of several mechanical press linkages. These linkages include the slider-crank and the four six-bar mechanisms formed by attaching a drag-link, crank-rocker, crank-shaper or Whitworth mechanism to a slider-crank. SDAMP performs four basic tasks: guided layout, kinematic analysis, mechanism refine and kinematic synthesis. Guided layout leads the user through joint selection to ensure a functioning mechanism. Kinematic analysis displays the position, velocity, acceleration and jerk of the sliding output versus the rotation of the input link. Mechanism refine allows the user to vary the geometry of an existing mechanism towards the goal of achieving a desired kinematic analysis. Lastly, kinematic synthesis determines the set of defect-free slider-cranks capable of achieving four precision points. All of these capabilities are integrated through a host of GUI driven MATLAB files in SDAMP.

Dynamics Simulation and Analysis of Planetary Reducer

2013 ◽  
Vol 765-767 ◽  
pp. 422-426 ◽  
Author(s):  
Ling Ling ◽  
Yuan Yuan Yi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Boundary Conditions ◽  
Electric Vehicle ◽  
Coupling Model ◽  
Dynamics Simulation ◽  
Element Analysis ◽  
Flexible Coupling ◽  
Object Of Study ◽  
Planet Carrier

Taking a planetary reducer in an electric vehicle as the object of study, a rigid-flexible coupling model was established to perform the dynamics simulation. The variational regularities of the meshing forces, output speed and acting forces of bearings were obtained, and then a finite element analysis of the planet carrier was carried out. This method can not only solve the problem of the boundary conditions of planet carrier which are difficult to define in finite element analysis, but also improve the accuracy of analysis results when the influence of carrier flexibility on the whole system is considered in dynamics simulation, which lays the foundation for further research on reducers.

Analysis and Simulation on Dynamic Stress of Tracked Vehicle Sprocket Based on Rigid-Flexible Coupling

2011 ◽  
Vol 199-200 ◽  
pp. 1358-1361 ◽  
Author(s):  
Bing Chen ◽  
Zheng Tian ◽  
Zhong Jun Yin
Keyword(s):  
High Speed ◽  
Dynamic Stress ◽  
Element Model ◽  
Coupling Model ◽  
Tracked Vehicle ◽  
Flexible Coupling ◽  
Single Tooth ◽  
Gear Ring ◽  
Simulation Results ◽  
The Finite Element Model

This paper established a high-speed tracked vehicle dynamics model, and simulated the transient response of sprocket when the vehicle is running at 60km/h on the D class road. the finite element model of the single tooth in mesh is established in Ansys and the rigid-flexible coupling model of "trackboard- sprocket" is established in RecurDyn. The dynamic stress and strain fringe of the sprocket’s gear ring is achieved by analysis. Simulation results show that the stress of tracked vehicle sprocket gear root and the fixed gear bolt hole is larger, and the stress concentration is detected at the edge of contacted tooth. The simulation results provide the calculation basis for the optimization of the high-speed tracked vehicle system and its lifespan prediction.

scholarly journals Analysis of the Creeping Phenomenon of Linear Feed System Based on the Rigid-Flexible Coupling Model

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Ruijun Liang ◽  
Wenlong Hao ◽  
Wenfeng Ran ◽  
Wenhua Ye
Keyword(s):  
Dynamic Characteristic ◽  
Dynamic Performance ◽  
Rolling Bearing ◽  
Coupling Model ◽  
Ball Screw ◽  
Joint Surface ◽  
Characteristic Parameters ◽  
Feed System ◽  
Flexible Coupling ◽  
Body Model

A mathematical model of the creeping phenomenon based on the mechanical model of the linear feed system was established. The dynamic characteristic parameters of each fixed joint were obtained by Yoshimura’s integral. Using the method, only the dynamic characteristic parameters of the joint surface per unit area with simple structure need to be studied, and then, the dynamic characteristic parameters of the whole joint surface can be obtained by integration. Based on the principle of the half-power bandwidth method and the frequency response function identification, the dynamic parameters of each moving joint were solved by the method of experimental modal analysis. Through the parameters of the fixed and moving joints, a rigid body model of the feed system and a flexible body model including the power transmission parts (ball screw pair) and the motion guide parts (guide slide pair and rolling bearing) were, respectively, established. And then, a rigid-flexible coupling dynamic model of the feed system was obtained through the constraint relationships between joints. The influence of both the external load and the feed rate on the fluctuation of motion speed of the system was analyzed from this model. The difference between the experimental results and the simulation results on a feed system platform is not greater than 10%, which verifies the creeping phenomenon. This conclusion can provide a basis for the optimization of the dynamic performance of the ball screw linear-feeding workbench.

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