Non-Linear FEM Analysis of the Trunnion Suspension System

1991 ◽  
Author(s):  
Naoshi Satoh ◽  
Tetsuya Sakai ◽  
Mamoru Aida
Keyword(s):  
Fem Analysis ◽  
Suspension System ◽  
Non Linear

Characterization of automotive dampers using higher order frequency response functions

1997 ◽  
Vol 211 (3) ◽  
pp. 181-203 ◽  
Author(s):  
S Cafferty ◽  
G. R. Tomlinson
Keyword(s):  
Energy Transfer ◽  
Frequency Response ◽  
Ride Comfort ◽  
Higher Order ◽  
Suspension System ◽  
Response Functions ◽  
Frequency Response Functions ◽  
Damping Coefficients ◽  
Non Linear ◽  
Linear Behaviour

Automotive dampers are an important element of a vehicle's suspension system for controlling road handling and passenger ride comfort. Many automotive dampers have non-linear asymmetric characteristics to accommodate the incompatible requirements between ride comfort and road handling, thus the ride comfort engineer requires techniques that can characterize this non-linear behaviour and provide models of the dampers for use in ride performance simulations of the full suspension system. The work presented in this paper is concerned with developing a frequency domain technique using higher order frequency response functions (HFRFs) to characterize a Monroe automotive damper. The principal diagonals and multidimensional surfaces of the HFRFs up to third order are obtained. Non-linear damping coefficients for the damper are derived from the HFRFs and the energy transfer properties are investigated. The results show that the majority of the HFRFs contain no peaks or resonances, indicating that the damper has no preferred frequencies for energy transfer. The accuracy of the damping coefficients determined from the HFRFs is poor. This is due to the inability of the technique to measure the pure HFRFs and separate the effects of non-linearities in the input actuator from those in the damper. It is concluded that these constraints currently impose some limit on the use of the methodology.

Design and FEM analysis of pentagonal photonic crystal fiber for highly non-linear applications

2020 ◽  
Vol 52 (10) ◽  
Author(s):  
Raisa Mamtaz ◽  
Kawsar Ahmed ◽  
Bikash Kumar Paul ◽  
Md. Aslam Mollah ◽  
Mst. Nargis Aktar ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Fem Analysis ◽  
Crystal Fiber ◽  
Non Linear

Damage-Involved Response of Two Colliding Buildings under Non-Uniform Earthquake Loading

2013 ◽  
Vol 577-578 ◽  
pp. 197-200
Author(s):  
Robert Jankowski
Keyword(s):  
Ground Motion ◽  
Seismic Wave ◽  
Damage Model ◽  
Fem Analysis ◽  
Stochastic Modelling ◽  
Earthquake Loading ◽  
Non Linear ◽  
San Fernando ◽  
The Difference ◽  
Ground Motion Records

Pounding between insufficiently separated buildings, which may result in considerable damage or may even lead to the total collapse of colliding structures, has been repeatedly observed during earthquakes. Earthquake-induced collisions of buildings has been intensively studied applying various structural models. It was assumed in the analyses, however, that the seismic excitation is identical for all structural supports; whereas, in the reality, the ground motion differs from place to place due to spatial seismic effects connected with propagation of the seismic wave. The aim of the present paper is to conduct a detailed non-linear damage-involved analysis of pounding between two structures under non-uniform earthquake loading. A case of pounding between the Olive View Hospital main building and one of its stairway towers, observed during the San Fernando earthquake of 1971, has been considered in the study. In the numerical FEM analysis, non-linear material properties have been simulated using stiffness degradation (due to damage under cyclic loading) model of concrete and elastoplastic damage model of reinforcing steel. A method of conditional stochastic modelling has been used to generate the input ground motion records. The results of the study indicate that the incorporation of the non-uniform ground motion excitation may lead to substantial change of pounding-involved response of the structures. The difference between the uniform and non-uniform responses has been found to be relatively large considering the fact that the variation in the simulated input ground motion records was rather small. This shows the importance of incorporation in the damage-involved numerical analysis the effects connected with propagation of the seismic wave.

Improved optimal sliding mode control for a non-linear vehicle active suspension system

2017 ◽  
Vol 395 ◽  
pp. 1-25 ◽  
Author(s):  
Shi-An Chen ◽  
Jun-Cheng Wang ◽  
Ming Yao ◽  
Young-Bae Kim
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Active Suspension ◽  
Suspension System ◽  
Mode Control ◽  
Non Linear

Electrostatic Suspension System for Gyroscopes with Minimum Electrical Disturbing Torque via Non-Linear Pre-Compensation

1996 ◽  
Vol 210 (2) ◽  
pp. 123-127 ◽  
Author(s):  
W Q Yang
Keyword(s):  
Control System ◽  
Steady State ◽  
Position Control ◽  
Complete System ◽  
Suspension System ◽  
System Operation ◽  
Non Linear ◽  
Position Control System ◽  
Transient And Steady State ◽  
Steady State Performance

The new electrostatic suspension system (ESS) presented here is applicable to electrostatically suspended gyroscopes (ESG). The electrical disturbing torque (EDT) acting on the gyro rotor is reduced to much lower levels than possible with the conventional methods, thereby increasing the attainable accuracy of the instrument. This is achieved by eliminating the conventional pre-load voltage and instead applying only control voltages via an analogue non-linear pre-compensator to achieve linear position control system operation despite the square law relating the suspension force to the applied voltage. The transient and steady state performance of the complete system, with changes in position reference and external disturbing forces, are examined with the aid of computer simulations.

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