Shape Optimization of Engine Mounts for Enhanced Vibration Isolation

2013 ◽  
Author(s):  
Fadi Alkhatib ◽  
Anoop K. Dhingra
Keyword(s):  
Finite Element Analysis ◽  
Optimization Problem ◽  
Vibration Isolation ◽  
Elastic Stiffness ◽  
Nonlinear Finite Element ◽  
Optimum Shape ◽  
Parametric Approach ◽  
Element Analysis ◽  
Engine Mounts ◽  
Engine Mount

In this article, a parametric approach is used to determine the optimum geometric shape of an engine mount in order to minimize the vibrations transmitted to and from the engine. The engine mount used is an elastomeric mount which is made of rubber. For proper vibration isolation, elastomeric mounts are designed such that they have the necessary elastic stiffness rate characteristics in all directions. An optimization problem is first solved to determine the optimum values of stiffness, orientation and location of the mount system such that vibrations transmitted are minimal. Besides determining the optimum mount stiffness values, knowing the optimum shape of the rubber mount is also vital. The shape of the mount is determined such that it meets the required stiffness of the mounting system obtained from the dynamic analysis. A nonlinear finite element analysis is used to determine the final optimum shape and stiffness of the mount.

Engine Mount Optimization for Vibration Isolation in Motorcycles

2006 ◽  
Author(s):  
Sudhir Kaul ◽  
Anoop K. Dhingra ◽  
Timothy G. Hunter
Keyword(s):  
Optimization Problem ◽  
Vibration Isolation ◽  
Total Force ◽  
Engine Mounts ◽  
The Road ◽  
Design Variables ◽  
Swing Arm ◽  
Engine Mount ◽  
Six Degree Of Freedom

This paper presents a comprehensive model to capture the dynamics of a motorcycle system in order to evaluate the quality of vibration isolation. The two main structural components in the motorcycle assembly - the frame and the swing-arm - are modeled using reduced order finite element models; the power-train assembly is modeled as a six degree-of-freedom (DOF) rigid body connected to the frame through the engine mounts and to the swing-arm through a shaft assembly. The engine mounts are modeled as tri-axial spring-damper systems. Models of the front-end assembly as well as front and rear tires are also included in the overall model. The complete vehicle model is used to solve the engine mount optimization problem so as to minimize the total force transmitted to the frame while meeting packaging and other side constraints. The mount system parameters - stiffness, position and orientation vectors - are used as design variables for the optimization problem. The imposed loads include forces and moments due to engine imbalance as well as loads transmitted due to irregularities in the road surface through the tire patch.

Vibration isolation analysis of tubular sandwiched structure used for trackless rubber-tyred vehicles

2018 ◽  
Vol 26 (5-6) ◽  
pp. 380-388
Author(s):  
Bijuan Yan ◽  
Binhui Han ◽  
Jun Wang ◽  
Dagang Sun
Keyword(s):  
Vibration Isolation ◽  
Underground Mining ◽  
Energy Coupling ◽  
Middle Layer ◽  
Vertical Acceleration ◽  
Element Analysis ◽  
Engine Mounts ◽  
The Finite Element Analysis ◽  
Engine Mount ◽  
Sandwiched Structure

In this article, a kind of tubular sandwiched engine mount (TSEM) was first used in the trackless rubber-tyred vehicles (TRTVs). TRTV have been playing an important role in underground mining. However, during the working of TRTV, the vibrations are always violent and these vibrations are very harmful. Therefore, reducing the vibration of TRTV has become an urgent and important matter. The TSEM was made of three layers, that is, the external layer, the internal layer and the middle layer. The finite element analysis (FEA) was carried out to find out whether the deformation of TSEM could meet the design requirements. To grasp the vibration isolation feature of the TSEM, the tests were performed under two working conditions of TRTVs. The results show that the rear engine mounts could always get good vibration-reducing performance, whereas the performance of the front mounts is sometimes poor in a certain direction, that is, perhaps owing to the vibration energy coupling in different directions. In addition, the vibration of the seat was measured. The test results show that the vertical acceleration is reduced when the vehicle is installed with the TSEM, compared with that of the seat when the vehicle is equipped with the existing old mounts. The results in this article could provide a good reference for the application of the tubular sandwiched structure in different rubber-tyred vehicles.

Simulation Study on Armor-Piercing Effect of Armor-Piercing Bomb

2013 ◽  
Vol 456 ◽  
pp. 55-59
Author(s):  
Ren Bin Zhou ◽  
Xue Bing Liao ◽  
An Qing Ming ◽  
Yong Feng Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Simulation Study ◽  
Nonlinear Finite Element Analysis ◽  
Nonlinear Finite Element ◽  
Analysis Program ◽  
Element Analysis ◽  
Aluminum Target

Studying the armor-piercing effect of armor-piercing bomb that attacks aluminum target is essential, because the target can be considered the simulation of the actual fight equipment. Based on the hypothesis about building the fraction field, the armor-piercing effect of armor-piercing bomb is analyzed, and the velocity and the intruding depth parameter model of armor-piercing effect are established. Taking a certain armor-piercing bomb as example, the intruding processes of armor-piercing effect are simulated by using the nonlinear finite element analysis program LS-DYNA, while aluminum target simulates the wall of combat equipment in two different conditions. At last, the finite element simulated results are given and analyzed that agree with the experiments.

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