Design for a New Type of Powder Molding Equipment Based on Multibody Dynamics Simulation

2012 ◽  
Vol 468-471 ◽  
pp. 857-862
Author(s):  
Zhen Xing Zheng
Keyword(s):  
Powder Metallurgy ◽  
Multibody Dynamics ◽  
Lagrange Equation ◽  
Low Cost ◽  
Synthesis Method ◽  
Flexible Multibody Dynamics ◽  
Simulation Method ◽  
Dynamics Simulation ◽  
Flexible Body ◽  
Modal Synthesis

A new compaction powder metallurgy equipment integrated with the mould and the frame is introduced to substitute the traditional powder metallurgy equipment (P/M). During the design and manufacture, finite element method is used to analyze the motion of the equipment. The Lagrange equation and modal synthesis method for flexible body are constructed, and then the cooperative simulation method using ADAMS and MARC is present for solving flexible multibody dynamics of flexible body. Results show that the design of the structure of the powder metallurgy equipment is feasible and the low cost and the simple structure are its merits compared to the traditional equipment.

Flexible Multibody Dynamics Formulation by Hamilton’s Equations

2010 ◽  
Author(s):  
Martin M. Tong
Keyword(s):  
Multibody Dynamics ◽  
Multibody System ◽  
Mass Matrix ◽  
Equations Of Motion ◽  
Flexible Multibody Dynamics ◽  
Flexible Body ◽  
Flexible Multibody System ◽  
Generalized Coordinates ◽  
Flexible Multibody ◽  
The Matrix

Numerical solution of the dynamics equations of a flexible multibody system as represented by Hamilton’s canonical equations requires that its generalized velocities q˙ be solved from the generalized momenta p. The relation between them is p = J(q)q˙, where J is the system mass matrix and q is the generalized coordinates. This paper presents the dynamics equations for a generic flexible multibody system as represented by p˙ and gives emphasis to a systematic way of constructing the matrix J for solving q˙. The mass matrix is shown to be separable into four submatrices Jrr, Jrf, Jfr and Jff relating the joint momenta and flexible body mementa to the joint coordinate rates and the flexible body deformation coordinate rates. Explicit formulas are given for these submatrices. The equations of motion presented here lend insight to the structure of the flexible multibody dynamics equations. They are also a versatile alternative to the acceleration-based dynamics equations for modeling mechanical systems.

Alternating Stress Dynamics Analysis of Harmonic Gear Flexible Wheel

2012 ◽  
Vol 546-547 ◽  
pp. 102-109
Author(s):  
Xue Feng Han ◽  
Yang Bai ◽  
Ming Li ◽  
Hong Guang Jia
Keyword(s):  
Synthesis Method ◽  
Drive System ◽  
Dynamics Simulation ◽  
Theoretical Simulation ◽  
Gear Drive ◽  
Modal Synthesis ◽  
Change Trend ◽  
Simulation Results ◽  
To Come ◽  
Stress Simulation

This article is the study of alternating stress of flexible wheel in harmonic gear drive system. Firstly, according to elasticity theory to theoretically analyze flexible wheel stress; then, based on the basic principle of sub-structure modal synthesis method , use the software of UG、PATRAN and ADAMS to carry out co-simulation; Finally, based on the dynamics simulation, to analyze the alternating stress simulation results of flexible wheel and compare theoretical results and simulation results to come conclusion. The results show that: altering stress simulation results of flexible wheel are coincident with theoretical simulation results, have a deeper understand the stress change trend in the drive process of flexible wheel, lay a foundation for further carrying out dynamics simulation of harmonic gear drive system.

A Jupyter Notebook Environment for Multibody Dynamics

2020 ◽  
Author(s):  
Aaron Gaut ◽  
Jonathan Cameron ◽  
Abhinandan Jain
Keyword(s):  
Modeling And Simulation ◽  
Multibody Dynamics ◽  
Flexible Multibody Dynamics ◽  
Training Needs ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Engineering Applications ◽  
Topic Area ◽  
Significant Extension ◽  
On Line

Abstract DARTS is a rigid/flexible multibody dynamics toolkit for the modeling and simulation of aerospace and robotic vehicles for engineering applications. In this paper we describe an on-line, browser-based environment using Jupyter notebooks to support training needs for the DARTS software. The suite of curated tutorial notebooks is organized into different topic areas, and into multiple themes within each topic area. The notebooks within a theme use a progression of examples for users to expand their understanding of the software. The topic areas include one on the DARTS multibody dynamics software and another one on the theory underlying the multibody dynamics formulation. We also describe a number of Jupyter extensions that were used — and some developed in house — to enhance the notebook interface for use with the dynamics simulation software. One significant extension we implemented allows the embedding of live 3D visualizations within simulation notebooks.

scholarly journals Design of Shock Wave Storage and Test System with Variable Parameters Based on the Sensor of Piezoelectric Circuit

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Zhi Li
Keyword(s):  
Shock Wave ◽  
Data Storage ◽  
Large Scale ◽  
Low Cost ◽  
Complex Structure ◽  
Simulation Method ◽  
Test System ◽  
Dynamics Simulation ◽  
Storage Test ◽  
Variable Parameters

With the wide application of science and technology in the field of weapons, shock wave is an important breakthrough point in weapon research, and the storage and testing system of shock wave is a breakthrough point that people pay most attention to at present. Shock wave data storage has the characteristics of large scale, complex structure, low cost efficiency, and strong timeliness. This paper mainly studies the design of shock wave storage test system with variable parameters based on numerical piezoelectric circuit sensor. Based on fluid dynamics simulation theory and numerical simulation method, the normal and concave-convex three-dimensional models of two pressure measuring devices are constructed by using the flow waveform of calculator, and then, the network is divided. The results show that, under the same inlet pressure, the larger the bulge or depression value, the greater the influence on the experimental results. The influence of disk is 10% higher than that of pen, and the change rate of relative difference is increased by 1.5% with the increase of concave-convex value. Finally, experiments are carried out in different environments to verify the reliability, survivability, and flexibility. The shock wave storage test system is optimized when the parameters of the digital voltage circuit sensor are variable.

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