Modelling, validation and characterisation of high-performance suspensions by means of a suspension test rig

2019 ◽  
Vol 79 (2/3) ◽  
pp. 107
Author(s):  
Christoph Zauner ◽  
Manfred Plöchl ◽  
Johannes Edelmann
Keyword(s):  
High Performance ◽  
Test Rig ◽  
Suspension Test

Evolution of Multi Axis Suspension Test Rig from Reaction Type to Inertial Type

2021 ◽  
Author(s):  
Vishal N Suryawanshi ◽  
Atul M Kajalkar ◽  
Suraj S Mohite ◽  
Milind A Bankar ◽  
Deepak B Bhusari
Keyword(s):  
Test Rig ◽  
Reaction Type ◽  
Suspension Test

scholarly journals Research on Blade-Casing Rub-Impact Mechanism by Experiment and Simulation in Aeroengines

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Jie Hong ◽  
Tianrang Li ◽  
Zhichao Liang ◽  
Dayi Zhang ◽  
Yanhong Ma
Keyword(s):  
High Speed ◽  
High Performance ◽  
Element Model ◽  
Physical Parameters ◽  
Test Rig ◽  
Calculation Results ◽  
Rotor Support ◽  
Blade Tip ◽  
Set Up ◽  
The Impact

Aeroengines pursue high performance, and compressing blade-casing clearance has become one of the main ways to improve turbomachinery efficiency. Rub-impact faults occur frequently with clearance decreasing. A high-speed rotor-support-casing test rig was set up, and the mechanism tests of light and heavy rub-impact were carried out. A finite element model of the test rig was established, and the calculation results were in good agreement with the experimental results under both kinds of rub-impact conditions. Based on the actual blade-casing structure model, the effects of the major physical parameters including imbalance and material characteristics were investigated. During the rub-impact, the highest stress occurs at the blade tip first and then it is transmitted to the blade root. Deformation on the impact blade tip generates easily with decreased yield strength, and stress concentration at the blade tip occurs obviously with weaker stiffness. The agreement of the computation results with the experimental data indicates the method could be used to estimate rub-impact characteristics and is effective in design and analyses process.

Development of Test Rig for High-Speed Railway Rolling Bearings

2011 ◽  
Vol 101-102 ◽  
pp. 702-707 ◽  
Author(s):  
Zhao Dong Huang ◽  
Bo Qian Fan ◽  
Xiao Ping Ouyang ◽  
Ling Ling Xu ◽  
Zhi Gang Wang
Keyword(s):  
High Speed ◽  
High Performance ◽  
Rolling Bearing ◽  
Main Shaft ◽  
Heavy Vehicles ◽  
Test Rig ◽  
Rolling Bearings ◽  
Heavy Load ◽  
High Speed Railway ◽  
Mechanical Structure

The rolling bearing test rig for heavy vehicles often works under heavy load and high speed, thus it requires high performance for the main shaft and mechanical structure. In this paper a design of test rig for high-speed railway rolling bearings is presented, in which a new structure is adopted to reduce the load on the support bearings. The basic idea is to position the load in a way that they can be balanced by each other.

Experimental Investigation of Squeeze Film Damper Characteristics at High Speed Rotor Configurations

2014 ◽  
Author(s):  
Jayaraman Kandasamy ◽  
B. L. Jaiswal ◽  
P. Sarasu ◽  
S. Sivaperumal ◽  
Dilli Babu ◽  
...  
Keyword(s):  
High Speed ◽  
High Performance ◽  
Critical Speed ◽  
Advanced Materials ◽  
Squeeze Film ◽  
Test Rig ◽  
Variable Frequency Drive ◽  
Squeeze Film Damper ◽  
Essential Components ◽  
Turbo Machinery

High performance turbo machinery demands high shaft speeds, increased rotor flexibility, tighter clearances in flow passages, advanced materials, and increased tolerance to imbalances. Operation at high speeds induces severe dynamic loading with large amplitude journal motions at the bearing supports. Squeeze film dampers are essential components of high-speed turbo machinery since they offer the unique advantages of dissipation of vibration energy and isolation of structural components, as well as the capability to improve the dynamic stability characteristics of inherently unstable rotor-bearing systems. A bearing test rig is developed using 350 KW motor with variable frequency drive and has the potential of maximum operating speed up to 20,000 rpm. A squeeze film damper is used between the bearings and housing to reduce the unbalance forces transmitted to the pedestal by introducing an additional damping and thereby reduces the amplitude of vibration to acceptable level. The test rig instrumentation is capable of detecting bearing critical speed of the test rotor, and has been used for parametric studies and to monitor the temperature profile, vibration levels and pressure distribution of SFD oil film. The first critical speed of the test rotor is measured. The vibration level of the rotor system is increased with the rise of axial load together with speed. It is estimated that under all the conditions presence of oil in SFD zone reduces the vibration levels.

scholarly journals Vibration control of FSAE quarter car suspension test rig using magnetorheological damper

2020 ◽  
Vol 17 (3) ◽  
pp. 1281
Author(s):  
Muhammad Adhar Bagus ◽  
Azizan As’arry ◽  
Hesham Ahmed Abdul Mutaleb Abas ◽  
Abdul Aziz Hairuddin ◽  
Mohd Khair Hassan
Keyword(s):  
Vibration Control ◽  
Natural Frequency ◽  
Pid Controller ◽  
Mr Damper ◽  
Magnetorheological Damper ◽  
Test Rig ◽  
Damping Force ◽  
Car Suspension ◽  
Quarter Car ◽  
Suspension Test

Recently MRF damper -which has a significant controllable damping force - used frequently in many active and semi-active suspension systems. However, MRF damper needs controller to estimate the desired force to dissipate the occurred vibration instantaneously. PID controller is one of the effective feedback controllers which shows robustness and simplicity in control MRF dampers, but still the parameters of the PID controller under study to find out the optimum values. This study focused on the vibration control using Magneto-rheological (MR) damper on a FSAE quarter car suspension test rig to study and obtain the optimum running condition. The test rig was designed, modified and then tested using a P-controller integrated with MR damper, unbalance mass used as disturbance and analyzed using LABVIEW software in time and frequency domains. The natural frequency obtained was 2.2 Hz were similar to the actual FSAE car natural frequency. Based on the acceleration against time graph with different proportional gain value the optimal value for proportional gain, Kp was 1. Hence, the experiment work could be used as the initial stage to study and develop a robust controller to suppress vibration on a car.

scholarly journals Weight reduction of a carbon fibre composite wheel

2019 ◽  
Vol 26 (1) ◽  
pp. 338-346
Author(s):  
Stefan Czypionka ◽  
Frank Kienhöfer
Keyword(s):  
Carbon Fibre ◽  
Fatigue Test ◽  
Weight Reduction ◽  
High Performance ◽  
Fibre Composite ◽  
Bending Moment ◽  
Simulation Models ◽  
Fe Model ◽  
Test Rig ◽  
Aluminium Wheel

AbstractThe wheel of a passenger vehicle must be designed to be safe and light. Despite the tremendous potential of carbon fibre as an automotive material due to high strength and low weight, the prevalence of carbon fibre reinforced plastics (CFRPs) in vehicle wheels is limited. Manufacturing and testing CFRP prototypes is expensive. Thus it is advantageous to develop simulation models for composite weight reduction. The simulation models can provide insight into how lighter CFRP wheels can be designed. This study presents the design development of a CFRP wheel for a high-performance roadster; the CFRP wheel is offered by an automotive manufacturer as a high-performance option instead of aluminium wheels. Finite element (FE) simulations were initially conducted assuming an isotropic material. This initial model was used to eliminate stress concentrations and to design and manufacture an initial CFRP wheel. The CFRP wheel weight is 6.8 kg as compared to the original aluminium wheel which weighs 8.1 kg. This initial design passed the dynamic cornering fatigue test (the most stringent strength test for wheels). Thereafter the wheel was instrumented with strain gauges and a bending moment was applied to the hub using a custom-built test rig. The test rig produced a static load equivalent to the dynamic cornering fatigue test (in which the applied bending moment varies sinusoidally). The test rig allowed for the deflection of the load arm to be measured. The comparison of the experimentally measured strains and an FE model which includes the CFRP laminate properties showed good agreement. Two alternative laminate options were simulated using the FE model. These showed both an increase in stiffness and a calculated weight reduction. This study shows that an aluminium wheel for a high-performance roadster can be redesigned using CFRP to be 16% lighter and using a FE model a further 152 g weight reduction is possible (18% weight reduction in total when compared to the aluminium wheel).

Simulation-based identification of excitation spectra for a dynamic suspension test rig

2017 ◽  
pp. 1231-1246
Author(s):  
Christoph Zauner ◽  
G. Boisdequin ◽  
M. Eisenbarth ◽  
T. Maulick ◽  
M. Plöchl ◽  
...  
Keyword(s):  
Test Rig ◽  
Excitation Spectra ◽  
Simulation Based ◽  
Suspension Test

scholarly journals Friction compensation using Coulomb friction model with zero velocity crossing estimator for a force controlled model in the loop suspension test rig

2015 ◽  
Vol 230 (12) ◽  
pp. 2028-2045 ◽  
Author(s):  
Pooh Eamcharoenying ◽  
Andy Hillis ◽  
Jos Darling
Keyword(s):  
Coulomb Friction ◽  
Tracking Error ◽  
Force Sensor ◽  
Friction Model ◽  
Friction Compensation ◽  
Test Rig ◽  
Zero Crossing ◽  
Force Tracking ◽  
Coulomb Friction Model ◽  
Suspension Test

This paper presents a method of friction compensation for a linear electric motor in a model in the loop suspension test rig. The suspension consists of a numerically modeled spring and damper, with inputs of suspension motion. The linear motor is force controlled using a force sensor to track the output of the numerical model. The method uses a Coulomb friction model and applies a feedforward step signal when velocity zero crossing occurs. Velocity zero crossing estimation is achieved using an algorithm based on measured feedback velocity and force. Experimental results indicate reduction of force tracking error caused by Coulomb friction leading to improved test rig accuracy.

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