Dynamic Model and Computer Simulation of Valve Train Assemblies with Hydraulic Lash Adjuster

1996 ◽  
Author(s):  
Dequan Zou ◽  
Harold E. McCormick
Keyword(s):  
Computer Simulation ◽  
Dynamic Model ◽  
Valve Train

Critical Design Condensation Locations in Facial Masks

2010 ◽  
Author(s):  
A. M. Al-Jumaily
Keyword(s):  
Heat Transfer ◽  
Computer Simulation ◽  
Dynamic Model ◽  
Fluid Dynamic ◽  
Condensation Rate ◽  
Facial Mask ◽  
Critical Design ◽  
Life Threatening ◽  
Mass And Heat Transfer

Facial masks are the main interface between patients and breathing supportive devices. Condensation in these masks causes serious breath disturbance which could be life threatening. Based on temperature-driven mass and heat transfer formulations, a computer simulation fluid dynamic model is developed to compute the condensation rate and locations of a typical breathing facial mask. Condensation measurements are taken to validate the model. The effects of mask geometry and shape on condensation are elaborated on.

scholarly journals Neural Network Identification and Control of a Parametrically Excited Structural Dynamic Model of an F-15 Tail Section

2000 ◽  
Vol 7 (6) ◽  
pp. 355-361 ◽  
Author(s):  
Ayman A. El-Badawy ◽  
Ali H. Nayfeh ◽  
Hugh Van Landingham
Keyword(s):  
Neural Network ◽  
Computer Simulation ◽  
Dynamic Model ◽  
Parametric Excitation ◽  
Vibration Suppression ◽  
Great Promise ◽  
Structural Dynamic ◽  
Neural Network Controller ◽  
Structural Dynamic Model ◽  
Computer Simulation Studies

We investigated the design of a neural-network-based adaptive control system for a smart structural dynamic model of the twin tails of an F-15 tail section. A neural network controller was developed and tested in computer simulation for active vibration suppression of the model subjected to parametric excitation. First, an emulator neural network was trained to represent the structure to be controlled and thus used in predicting the future responses of the model. Second, a neurocontroller to determine the necessary control action on the structure was developed. The control was implemented through the application of a smart material actuator. A strain gauge sensor was assumed to be on each tail. Results from computer-simulation studies have shown great promise for control of the vibration of the twin tails under parametric excitation using artificial neural networks.

Dynamic Simulation and Test for the Valve Train Dynamics

2011 ◽  
Vol 117-119 ◽  
pp. 15-19 ◽  
Author(s):  
Cai Yun Guan ◽  
You Ming Chen ◽  
Wen Jie Qin
Keyword(s):  
Dynamic Model ◽  
Contact Stiffness ◽  
Quantitative Agreement ◽  
Measured Data ◽  
Valve Train ◽  
Parameter Determination ◽  
Cam Follower ◽  
Train Dynamics ◽  
Simulation Results

This paper presents the development of a dynamic model of the valve train of one engine. During the parameter determination of the model, finite element method is used to calculate the contact stiffness of the cam-follower . The simulation results of the model are compared with measured data of the valve train at same speed. Excellent quantitative agreement is found between the numerical and experimental results and the validity of the dynamic model can be verified.

New Model with Spring and Simulation of Flexible Manipulator

2014 ◽  
Vol 513-517 ◽  
pp. 3840-3843
Author(s):  
Ying Tian ◽  
Jian Hua Qian ◽  
Qing Song Liu ◽  
Jie Yuan
Keyword(s):  
Computer Simulation ◽  
Dynamic Model ◽  
Elastic Energy ◽  
Lagrange Equation ◽  
Rigid Bodies ◽  
Flexible Manipulator ◽  
Dynamic Parameters ◽  
New Model ◽  
Real Model ◽  
Model Computer

For easily calculated and more accurate dynamic model of single flexible manipulator, a new model was built through connection of spring and two rigid bodies. It is approximate to the real model of single manipulator in trajectory of end point. With simplifying manipulator and introducing simplified and Predetermined elastic energy of manipulator, Lagrange equation was used to built dynamic model based on the new model. And based on dynamic model, computer simulation result of dynamic parameters with Matlab software proved that the new model is available simple and easily-adjusted.

scholarly journals Dynamic Modeling and CAE Cosimulation Method for Heavy-Duty Concrete Spreader

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Shiying Zhang ◽  
Ke Zhang ◽  
Bo Song ◽  
Wenda Yu ◽  
Dong Li
Keyword(s):  
Computer Simulation ◽  
Dynamic Model ◽  
Degrees Of Freedom ◽  
Coupling Model ◽  
Heavy Duty ◽  
Flexible Coupling ◽  
Simulation Process ◽  
Coupling System ◽  
Adams Software ◽  
Model Derivation

This paper presents the dynamic model of heavy-duty concrete spreader with liquid-solid rigid-flexible coupling by means of mathematical modeling and CAE cosimulation. The mathematical method of liquid-solid dynamic model of heavy-duty concrete spreader is described. Based on the liquid-solid coupling system, two degrees of freedom are added to change the model into a liquid-solid rigid-flexible coupling model, and the calculation process of the model is given in detail. The results show that, considering two flexible body factors, the solution scale is relatively large and the complexity of mathematical model derivation is increased. It is very difficult to establish a general dynamic equation which can be easily solved by computer. Therefore, this paper presents a new method of CAE cosimulation of liquid-solid rigid-flexible coupling. This method is divided into two parts: the computer simulation process of liquid-solid coupling and the computer simulation process of rigid-flexible coupling. First, the fluid-solid coupling is carried out by COMSOL software, and then the rigid-flexible coupling is carried out by HyperMesh software, Ansys software, and Adams software. This method can easily establish the dynamic model of the liquid-solid rigid-flexible coupling system, which provides a new idea for the simulation of heavy-duty concrete spreader. The simulation results can provide valuable insights into product design and structural optimization.

A New Numerical Method for Developing the Lumped Dynamic Model of Valve Train

2015 ◽  
Vol 137 (10) ◽  
Author(s):  
Jie Guo ◽  
Yipeng Cao ◽  
Wenping Zhang ◽  
Xinyu Zhang
Keyword(s):  
Dynamic Model ◽  
Natural Frequencies ◽  
Valve Train ◽  
Frequency Range ◽  
Matching Method ◽  
Lumped Masses ◽  
Flexible Component ◽  
Train Vibration ◽  
Train System ◽  
Low Order

The dynamics of valve train is influenced by stiffness, size, and mass distribution of its components and initial valve clearance and so on. All the factors should be taken into consideration correctly by dynamic model and described qualitatively and quantitatively through mathematical variables. This paper proposes a new simplified method for valve train components, namely, mode matching method (MMM) for camshaft, pushrod, rocker arm, valve, and valve spring. In this method, the amount of lumped masses for each flexible component is determined based on its natural frequencies and the considered frequency range. As a result, the dynamic model of each component is required to match its low order modes within the considered frequency range. The basis of this method is that the contributions of each component to valve train vibration are mainly in the low order modes. The numerical model of valve train is verified by an experiment conducted on a motor driven valve train system.

Study on Mechanics Properties of Shifting Impact of Overrunning AMT

2012 ◽  
Vol 252 ◽  
pp. 134-139
Author(s):  
Jian Jun Hao ◽  
Shuai Shuai Ge ◽  
Xi Hong Zou ◽  
Xiao Hui Ding
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Dynamic Model ◽  
Structural Characteristics ◽  
Transmission System ◽  
Separation Process ◽  
Force Analysis ◽  
Long Time ◽  
Simulation Results ◽  
The Mathematical Model

Aiming at the problem of long time power interruption and clutch master-slave friction plates wore seriously which greatly shorten the life of clutch during shifting process of AMT, a overrunning AMT without separation process of clutch when shifting is designed. This paper has analyzed structural characteristics and shift principle of overrunning AMT. Through force analysis on the jointing process of roller overrunning clutch, the mathematical model and dynamic model of transmission system are established. Finally, the shifting impact of shifting process is analyzed based on computer simulation. The simulation results indicate that vehicle longitudinal degree of jerk meets the requirement of vehicle comfort.

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