Validation of a Finite Element Multibody System Model for Vehicle-Slab Track Application

2020 ◽  
pp. 407-414
Author(s):  
Zhiyong Shi ◽  
Martina Meacci ◽  
Enrico Meli ◽  
Kaiyun Wang ◽  
Andrea Rindi
Keyword(s):  
Finite Element ◽  
Multibody System ◽  
System Model ◽  
Slab Track

Performance of a Stirling Engine Regenerator Having Finite Mass

1986 ◽  
Vol 108 (4) ◽  
pp. 669-673 ◽  
Author(s):  
J. D. Jones
Keyword(s):  
Finite Element ◽  
Pressure Variation ◽  
Stirling Engine ◽  
System Model ◽  
Finite Mass ◽  
Element System ◽  
The Matrix ◽  
Cyclic Variations ◽  
Good Agreement ◽  
Engine Power

The performance of a Stirling engine regenerator subjected to sinusoidal mass flow rate and pressure variation is analyzed. It is shown that cyclic variations in the temperature of the matrix due to its finite mass lead to an increase in the apparent regenerator effectiveness, but a decrease in engine power. Approximate closed-form expressions for both of these effects are deduced. The results of this analysis are compared with the predictions of a finite-element system model, and good agreement is found.

Development of an Engine System Model for Predicting Structural Vibration

1995 ◽  
Author(s):  
S. H. Sung ◽  
D. J. Nefske
Keyword(s):  
Finite Element ◽  
Narrow Band ◽  
Vibration Response ◽  
System Model ◽  
Structural Vibration ◽  
Octave Band ◽  
Engine System ◽  
Excitation Frequencies ◽  
Engine Components ◽  
Structural Mass

Abstract A finite-element based engine system model is developed for predicting the structural vibration of the engine. The engine system model combines modal models of the major bolted-together sub-structures of the engine, with non-structural mass models of the remaining engine components added to bring the inertial properties to those of the running engine. The model is developed and experimentally evaluated with impact and shaker excitation tests. Comparisons are made of the predicted and measured vibration response for various partially assembled engine configurations, as well as for the fully assembled engine. The comparisons illustrate the accuracy of the model in predicting the narrow-band and one-third octave-band vibration response for excitation frequencies up to 2 kHz.

Kinematics and Dynamics of a Multibody System of an Oilfield Pumping Unit by Means of Finite Element Method

1997 ◽  
Author(s):  
Si-zhu Zhou ◽  
Jacob Jen-Gwo Chen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Multibody System ◽  
Elastic System ◽  
Global Analysis ◽  
Oil Field ◽  
Kinematics And Dynamics ◽  
The Matrix ◽  
Pumping Unit ◽  
Element Method

Taking a multibody system of the oil field pumping unit into a multibody elastic system, this paper analyzes its kinematics and dynamics by means of finite element method, deduces the kinematics and dynamics function after doing the element’s and global analysis, and puts forward the procedures of this method, i.e., (1) dividing the system into elements; (2) calculating for the elements; (3) calculating the matrix of external force; (4) piling the element stiffness and mass matrixes up; and (5) solving the function. As an example, this paper illustrates the process of analyzing the multibody system of a PUMPING UNIT used in an oil field.

Study on the Mixed Method of Transfer Matrix Method and Finite Element Method for Vibration of Multibody System

2019 ◽  
Author(s):  
Hanjing Lu ◽  
Xiaoting Rui ◽  
Jianshu Zhang ◽  
Yuanyuan Ding
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Transfer Matrix ◽  
Mixed Method ◽  
Transfer Matrix Method ◽  
Transfer Equation ◽  
Matrix Method ◽  
Multibody System ◽  
Mass Matrix ◽  
Element Method

Abstract The mixed method of Transfer Matrix Method for Multibody System (MSTMM) and Finite Element Method (FEM) is introduced in this paper. The transfer matrix and transfer equation of multi-rigid-body subsystem are deduced by MSTMM. The mass matrix and stiffness matrix of flexible subsystem are calculated by FEM and then its dynamics equation is established. The connection point relations among subsystems are deduced and the overall transfer matrix and transfer equation of multi-rigid-flexible system are established. The vibration characteristics of the system are obtained by solving the system frequency equation. The computational results of two numerical examples show that the proposed method have good agreements with MSTMM and FEM. Multi-rigid-flexible-body system with multi-end beam can be solved by proposed method, which extends the application field of MSTMM and provides a theoretical basis for calculating complex systems with multi input end flexible bodies of arbitrary shape.

Resonant Pavement Breaker Vibration System Design and Simulation

2013 ◽  
Vol 850-851 ◽  
pp. 266-269
Author(s):  
Song He Zhu ◽  
Bo Yang ◽  
Xian Xiao Hou ◽  
Guo Sheng Lv ◽  
Ming He
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
System Design ◽  
Virtual Prototype ◽  
Concrete Pavement ◽  
Vibration Characteristics ◽  
System Model ◽  
Vibration System ◽  
Cement Concrete ◽  
Cement Concrete Pavement

This paper is about the vibration system of cement concrete pavement resonant breaker design and simulation. Finished the design and simulation of vibration system model and got the vibration characteristics and its parameters in detail by using virtual prototype technology and finite element method.

A Multibody System Model for Meshing Gears

2010 ◽  
Vol 44-47 ◽  
pp. 1273-1278 ◽  
Author(s):  
Liu Lei
Keyword(s):  
Multibody Dynamics ◽  
Multibody System ◽  
Gear Wheel ◽  
Numerical Approach ◽  
Computational Effort ◽  
Rigid Bodies ◽  
The Body ◽  
System Model ◽  
New Approach ◽  
Elastic Elements

As a type of numerical approach to dynamics of gears, multibody dynamics method can handle realistic cases of contact modeling with acceptable accuracy and considerably less computational effort. The ability to simulate contact between teeth has become an essential topic in multibody dynamics. Fully rigid method is not suited for a high quality of the analysis to take into account some elasticity in the model of meshing gear wheels. In our new approach the circumferentially rotatable rigid teeth and elastic elements composed of rotational spring-damper combinations are hereby put forward. The teeth and the body of each gear wheel are still regarded as rigid bodies, but they are connected with each other by elastic elements. Besides, Lankarani & Nikravesh Contact Model is utilized, which counts energy dissipation by means of viscous damping. Both large motions with revolutions and important elasticity are considered in this teeth-wheel multibody system model. Two examples are provided in which the simulation results of completely rigid method, the approach in [10], our new approach and finite element methods are compared. Comparisons indicate that our newly developed approach is more suitable for modeling multibody geared systems.

Study on Dynamics Characteristics of Concrete Floating Slab Track in Urban Track

2006 ◽  
Vol 302-303 ◽  
pp. 700-705 ◽  
Author(s):  
Gao Liang ◽  
Ke Ming Yin ◽  
Ge Yan Zhang
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Dynamic Responses ◽  
Finite Element Analyses ◽  
Analysis Model ◽  
Slab Track ◽  
Stiffness And Damping

In this paper, in order to do research on the characteristics of reducing vibration and declining noise of concrete floating slab track, the vertical dynamic analysis model of vehiclefloating slab track is established with the use of finite element analyses method. By using this model, dynamic responses of floating slab track are studied under different conditions of train’s speed, stiffness and damping of infrastructure, structure size, etc. On the basis of this research, some suggestions for design of floating slab track are put forward.

Designing the Dynamic Behavior of an Engine Suspension System Through Genetic Algorithms

2001 ◽  
Vol 123 (4) ◽  
pp. 480-486 ◽  
Author(s):  
Niccolo` Baldanzini ◽  
Davide Caprioli ◽  
Marco Pierini
Keyword(s):  
Genetic Algorithm ◽  
Genetic Algorithms ◽  
Dynamic Behavior ◽  
Multibody System ◽  
Suspension System ◽  
Innovative Approach ◽  
System Model ◽  
Design Stage ◽  
Dynamic Design ◽  
Dynamic Constraints

This work presents an innovative approach to dynamic design that has the significant advantage of allowing the dynamic requirements to be specified from the earliest design stage. The method applies genetic algorithms to optimize the dynamic behavior of the engine-subframe system and its links to the chassis. The optimization minimizes the sum of the amplitudes of the forces transmitted to the chassis from each mounting, while complying with the static and dynamic constraints. The genetic algorithm was applied to a multibody system model of the engine-subframe system and its links to derive new, improved configurations.

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