Functional Analysis of Bushing in Four-Link Suspension on K&C Characteristics Using Multibody Dynamics Method

2012 ◽  
Author(s):  
Kang Song ◽  
Xiao-kai Chen ◽  
Yi Lin ◽  
Zheng-Dong Ma
Keyword(s):  
Vehicle Dynamics ◽  
Torsional Stiffness ◽  
Main Function ◽  
Displacement Method ◽  
Force Method ◽  
Acceptable Range ◽  
Loading Tests ◽  
Dynamics Method ◽  
Translational Stiffness ◽  
Numerical Calculation Result

The link of multilink suspension usually has bushings at both body connection and wheel carrier connection. These bushings are designed subjected to the function of link. In the studies of vehicle dynamics, bushing could be represented by three translational stiffness and three torsional stiffness as well as corresponding damping. Due to specific location and orientation of each bushing, usually only one of these six stiffness plays an important role. In this paper, effect of bushing on suspension K&C characteristics was investigated with a four-link suspension. Through virtual loading tests, force distribution of suspension bushing was studied to find the relation between bushing stiffness and K&C characteristics. In order to quantitatively measure effect of bushing stiffness on parasitic rate, an “equivalent force” method based on energy conservation was proposed. Similarly, an “equivalent displacement” method was proposed to measure effect of bushing stiffness on suspension compliance. According to theoretical analysis and numerical calculation result, six stiffness of a bushing could be classified into three categories: main function stiffness closely related to suspension behavior, sub-function stiffness affecting parasitic rate or subjected to large load and non-function stiffness to be controlled within an acceptable range.

Design, static analysis and development of a new three-legged shake table

2021 ◽  
pp. 095440622110184
Author(s):  
Ganesh Mangavu ◽  
Anjan Kumar Dash
Keyword(s):  
Vertical Motion ◽  
Torsional Stiffness ◽  
Shake Table ◽  
Lateral Motion ◽  
Sinusoidal Motion ◽  
Gravity Load ◽  
Simulation Results ◽  
Electromechanical Actuation ◽  
Translational Stiffness ◽  
Earthquake Data

In this paper, an alternative design is proposed based on a family of three-legged manipulators. Such manipulators have two actuators (one vertical and one horizontal) in each leg, unlike the standard UP̅S Stewart platform, which has one actuator in each leg. The arrangement of the two actuators is such a way that, to have vertical motion of the shake table only the Vertical Motion Actuators (VMA) are actuated and for longitudinal or lateral motion, the Horizontal Motion Actuators (HMA) alone are moved. Due to its inherent features such as simplified kinematics, control and distributed loading, a study is carried out to determine the performance of such three-legged manipulators as a shake table. Sinusoidal motion and white noise motions are given to the actuators and shown that the VMA forces have linear relationship with the platform forces. The translational stiffness and the torsional stiffness are studied separately for the manipulators. In the dynamic analysis, it is highlighted that the gravity load of the legs is borne by the Vertical actuators, irrespective of the motion being spatial or planar. Hence, this topology provides scope for lighter electromechanical actuation. The performance analysis of the 3 legged configuration is accomplished using simulation results, in comparison to a 7-UP̅S configuration of shake table. A prototype of the shake table is fabricated and tested with earthquake data of El Centro.

scholarly journals STRUCTURAL ANALYSIS OF SPACE TRUSS BY DISPLACEMENT METHOD AND FORCE METHOD

2000 ◽  
Vol 65 (534) ◽  
pp. 57-63 ◽  
Author(s):  
Shigetaka HANAI ◽  
Akira KAWASHIMA ◽  
Rintaro ISHIMARU ◽  
Hisashi TANAKA
Keyword(s):  
Structural Analysis ◽  
Displacement Method ◽  
Force Method ◽  
Space Truss

Topology Optimization of an Anti Roll Bar of a Heavy Commercial Truck for Vehicle Dynamics and Durability

2018 ◽  
Author(s):  
Ece Yenilmez ◽  
Ali Yasar ◽  
Polat Sendur
Keyword(s):  
Topology Optimization ◽  
Vehicle Dynamics ◽  
Optimization Methods ◽  
Torsional Stiffness ◽  
Fe Model ◽  
Simulation Tools ◽  
The Road ◽  
Advantages And Disadvantages ◽  
Optimization Study ◽  
Original Equipment Manufacturers

Meeting the stringent requirements on fuel economy and emissions is still a challenge for automotive original equipment manufacturers (OEMs). In this study, we consider the light weighting opportunities of a heavy commercial truck by evaluating the various requirements of its anti-roll bar. First, an MSC.ADAMS model of the truck is analyzed under some standard vehicle dynamics maneuvers and a target for the anti-roll bar is set. A topology optimization study is then performed using Solid Isotropic Material with Penalization (SIMP) method to determine its dimensions and material to meet this target. For this purpose, a finite element (FE) model of the anti-roll bar is developed in order to determine its torsional stiffness using MSC.Nastran commercial software. The advantages and disadvantages of various optimization results are discussed. Finally, fatigue performance of the anti-roll bar is assessed under the road load data coming from various road simulations. The results prove that the simulation tools and optimization methods offer great capabilities to meet challenging requirements of automotive industry.

scholarly journals Comparison of Internal Fixations for Distal Clavicular Fractures Based on Loading Tests and Finite Element Analyses

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Rina Sakai ◽  
Terumasa Matsuura ◽  
Kensei Tanaka ◽  
Kentaro Uchida ◽  
Masaki Nakao ◽  
...  
Keyword(s):  
Finite Element ◽  
Internal Fixation ◽  
Acromioclavicular Joint ◽  
Tension Band ◽  
Tension Band Wiring ◽  
Torsional Stiffness ◽  
Hook Plate ◽  
Fixation Method ◽  
Loading Tests ◽  
Clavicle Hook Plate

It is difficult to apply strong and stable internal fixation to a fracture of the distal end of the clavicle because it is unstable, the distal clavicle fragment is small, and the fractured region is near the acromioclavicular joint. In this study, to identify a superior internal fixation method for unstable distal clavicular fracture, we compared three types of internal fixation (tension band wiring, scorpion, and LCP clavicle hook plate). Firstly, loading tests were performed, in which fixations were evaluated using bending stiffness and torsional stiffness as indices, followed by finite element analysis to evaluate fixability using the stress and strain as indices. The bending and torsional stiffness were significantly higher in the artificial clavicles fixed with the two types of plate than in that fixed by tension band wiring (P<0.05). No marked stress concentration on the clavicle was noted in the scorpion because the arm plate did not interfere with the acromioclavicular joint, suggesting that favorable shoulder joint function can be achieved. The stability of fixation with the LCP clavicle hook plate and the scorpion was similar, and plate fixations were stronger than fixation by tension band wiring.

Simulation-Based Analysis of Articulated Steer Grader with Six Motor-Driven Wheels

2012 ◽  
Vol 455-456 ◽  
pp. 1090-1095
Author(s):  
Yan Hua Shen ◽  
Tao Hua Zhang ◽  
Chun Jin
Keyword(s):  
Vehicle Dynamics ◽  
Lateral Force ◽  
Torsional Stiffness ◽  
Body System ◽  
Wheel Drive ◽  
Simulation Based ◽  
Articulated Vehicle ◽  
Simulation Results ◽  
Multi Body ◽  
Yaw Angle

The dynamics performance of the articulated steer vehicle is investigated in this paper. This six-wheel drive hybrid articulated vehicle is believed to have good performance because these six motorized wheels can be controlled independently. The hybrid vehicle is modeled as multi-body system that considers the nonlinear vehicle dynamics, tyre models. The transient response of the vehicle, such as yaw angle, tire lateral force and the torques at the wheel are simulated. The effects of the torsional stiffness, the position of center mass on the behavior of vehicle are presented. The simulation results show that the vehicle can be adaptive to the different working conditions by controlling the driving motor torque.

Design of a Parallel Manipulator With an Orthogonal Configuration

1999 ◽  
Author(s):  
Lung-Wen Tsai
Keyword(s):  
Stiffness Matrix ◽  
Parallel Manipulator ◽  
Translational Motion ◽  
Geometric Construction ◽  
Torsional Stiffness ◽  
Diagonal Form ◽  
Stiffness Matrices ◽  
Moving Platform ◽  
Stewart Gough Platform ◽  
Translational Stiffness

Abstract In this paper, the design of a 6–6 Stewart–Gough platform with an orthogonal configuration is presented. First, a geometric construction of the manipulator is described. Then, it is shown that translational motion of the moving platform can be achieved by programming the limb lengths such that they form three pairs of spatial parallelograms. The Jacobian and stiffness matrices are derived. Finally, it is shown that, at the orthogonal location, the stiffness matrix of the manipulator reduces to a diagonal form. Hence, translational stiffness of the manipulator is completely decoupled from torsional stiffness.

Integration of a Torsional Stiffness Model into an Existing Heavy Truck Vehicle Dynamics Model

2010 ◽  
Vol 3 (1) ◽  
pp. 175-186 ◽  
Author(s):  
Patrick J. Mcnaull ◽  
Mohamed Kamel Salaani ◽  
Dennis A. Guenther ◽  
Paul A. Grygier ◽  
Gary J. Heydinger
Keyword(s):  
Vehicle Dynamics ◽  
Torsional Stiffness ◽  
Dynamics Model ◽  
Stiffness Model ◽  
Heavy Truck
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