Analysis of High Frequency Forces Generated by Hydraulic Automotive Dampers

Yung, Victor Y. B.; Cole, David J.

doi:10.1080/00423114.2002.11666253

Cited by 7 publications

(9 citation statements)

References 1 publication

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“…Wavelet analysis of measured damper behaviour [3,4] indicated that friction and flow through the valve disc notches (operation in the low-speed region) are important in the generation of high-frequency forces. Thus, the modelling of these two mechanisms is expected to greatly influence the accuracy of high-frequency predictions.…”

Section: Model Accuracy Based On Wavelet Analysismentioning

confidence: 99%

“…The most recent published version of this model [11] and parameter identification procedure [9,12] was implemented in the Matlab/Simulink environment and used as a baseline for the present work. A general description of the model was presented in reference [1] and details of the implementation can be found in reference [3].…”

Section: Baseline Model and Parameter Identificationmentioning

confidence: 99%

“…Parameter identification and model validation experiments were performed on a damper that was originally specified for use in a luxury passenger car and modified to allow for the installation of pressure transducers. More information about the test damper and experimental apparatus can be found in references [2][3][4]. The mounting bushes normally used to connect the damper to the vehicle were removed in order to measure the characteristics of the damper alone.…”

Section: Baseline Model and Parameter Identificationmentioning

confidence: 99%

“…However, real damper behaviour is nonlinear which means that high frequency forces can be generated even when the damper is subjected to only low-frequency motion. In addition, the excitations experienced by a damper during in-vehicle operation encompass a broadband * [5] and by the authors [1][2][3][4] demonstrated that when a damper is subjected to an excitation consisting of two frequencies, the response at one frequency can be strongly influenced by the excitation at the second frequency. The analysis of experimental data presented in references [1][2][3][4] revealed the mechanisms involved in the interaction between frequencies for two-frequency and broadband random excitations.…”

Section: Introductionmentioning

confidence: 98%

“…A better understanding of high-frequency damper behaviour should lead to better vehicle design and development processes. This paper is aimed at providing such understanding and is a part of a larger programme that includes experimental measurements of damper behaviour and the interaction of the damper with other suspension components [1][2][3][4]. The work focuses on the behaviour of hydraulic monotube dampers; however, the modelling theory and validation methods can be applied to other dampers.…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

Modelling high frequency force behaviour of hydraulic automotive dampers

Yung

Cole

2006

Vehicle System Dynamics

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Little information on automotive damper performance above 30 Hz is found in the published literature. Design of vehicles for low levels of noise, vibration and harshness requires attention to higher frequencies. This paper describes research into modelling damper behaviour at frequencies up to 500 Hz. The performance of a monotube damper was measured and the empirical data were used to evaluate a recently published parametric model. Methods of assessing prediction accuracy using transfer and coherence functions, and a wavelet-based transfer function were introduced. Modifications to the model were then developed to improve the prediction of high-frequency behaviour.

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Section: Model Accuracy Based On Wavelet Analysismentioning

confidence: 99%

Section: Baseline Model and Parameter Identificationmentioning

confidence: 99%

Section: Baseline Model and Parameter Identificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Modelling high frequency force behaviour of hydraulic automotive dampers

Yung

Cole

2006

Vehicle System Dynamics

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Wavelet analysis of high-frequency damper behaviour

Yung

Cole

2005

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper describes research into the performance of a hydraulic automotive damper at frequencies up to 500 Hz. A review of published literature found little information on damper behaviour above 30 Hz. Design of vehicles for low levels of noise, vibration, and harshness (NVH) requires attention to these higher frequencies. The high-frequency force-velocity behaviour of a monotube damper was measured. Excitations included two-frequency inputs and a random input. In addition to traditional data analysis methods, techniques based on the wavelet transform were used. The results indicate that friction and hydraulic valve flow at near-zero velocity are important mechanisms in determining high-frequency force generation. Another significant mechanism is the transition between notch (leakage) flow and disc valve flow.

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Automotive Damper Model for Use in Multi-Body Dynamic Simulations

Allen

Hameed

Goyder

2006

Proceedings of the Institution of Mechanical Engineers, Part D:

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The subject of this study is the Warrior armoured personnel carrier rotary suspension damper. This is a simple passive device where energy is dissipated by the resistance to oil flowing through an orifice. In principle the mechanism of this damper is simple, but the requirement for a compact unit that can withstand high dynamic loads means that the design is complex in detail. Because of this complexity it is possible for air to remain in the oil chambers if care is not taken when priming the device. Measurements show that the nonlinear response of the damper is primarily due to turbulent oil flow through the orifice and the compression of entrapped air, but that friction is negligible. The most appropriate model for this system in multi-body dynamic simulations is to represent the damper as two discrete components: a non-linear dashpot (representing oil flow through the orifice) and a non-linear spring (representing the compression of entrapped air). From measurements, a splined curve is determined that describes the non-linear torque-velocity relationship due to orifice flow characteristics. By applying Henry's law and assuming isothermal compression, a function is derived that describes the compression of air in oil. This modelling method closely reproduces the measured response of the damper.

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Analysis of High Frequency Forces Generated by Hydraulic Automotive Dampers

Cited by 7 publications

References 1 publication

Modelling high frequency force behaviour of hydraulic automotive dampers

Modelling high frequency force behaviour of hydraulic automotive dampers

Wavelet analysis of high-frequency damper behaviour

Automotive Damper Model for Use in Multi-Body Dynamic Simulations

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