Simulation tool for shock absorber noise prediction in time and frequency domains

Sacramento, German; Biera, Jorge

doi:10.1504/ijvnv.2007.015174

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…More detailed spring valve models and their stability analyses are available in other applications, such as piping pressure relief valve studies [17,18]. Sacramento and Biera in [19] also compare simulation results and experiments, deriving good quantitative results up to 250 Hz. However the model used to perform the simulation is not detailed.…”

Section: Introductionmentioning

confidence: 99%

A shock absorber model for structure-borne noise analyses

Benaziz

Nacivet

Thouverez

2015

Journal of Sound and Vibration

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Section: Introductionmentioning

confidence: 99%

A shock absorber model for structure-borne noise analyses

Benaziz

Nacivet

Thouverez

2015

Journal of Sound and Vibration

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“…Swish noise is considered by the vehicle manufacturer as air-borne noise radiated off the hydraulic damper to the vehicle body. 4 This noise is easily reproducible in a laboratory environment and its contribution is regulated by a time or frequency domain amplitude set by the vehicle or shock manufacturer. The second type of hydraulic damper noise is often described as regular operational noise or ‘chuckle noise’.…”

Section: Introductionmentioning

confidence: 99%

“…The interested reader can find more information in previous studies. 4,5 Such a hydraulic damper evaluation method is explored in the paper using a simulation model instead of physical prototypes, saving time and money.…”

Section: Introductionmentioning

confidence: 99%

Development of an optimization method for minimizing vibrations of a hydraulic damper

2013

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The aim of this paper is to provide a mathematical method for minimizing the vibrations produced by hydraulic dampers, while maintaining the same damping force characteristics. The vibration level depends on the force–pressure characteristics of valve systems, which determine the damping force and high-frequency acceleration characteristic of a damper, and which need to be optimally tuned to lower the noise level. The paper considers a model-based approach to obtain the optimal pressure–flow characteristic via simulations conducted with the use of coupled models, including the damper and the servo-hydraulic tester model. The objectives of this work were as follows: (i) develop or adapt a double-tube damper model including pressure–flow valve characteristics; (ii) define key parameters of the valve characteristics influencing the high-frequency piston-rod acceleration, which is considered as a measure of vibration level; (iii) identify the parameter values (trends) minimizing the piston-rod acceleration using two alternative methods, namely a quick-and-dirty method based on a design of experiment (DOE) plan and a nonlinear programming method; (iv) obtain the optimal pressure–flow characteristic minimizing the vibration level by means of simulation; and (v) perform an experimental study comparing the high-frequency content of acceleration produced by the damper assembled with the original and optimized valve system using a laboratory setup.

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“…In earlier studies [1][2][3][4] attempts were made to model the behavior of a shock absorber. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Experimental identification of shock absorber knocking noise using various input waveforms

Michalakoudis¹,

Thite²

2013

noise cont engng j

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Shock absorber transient noise, often referred as clonk or knock noise, has been a challenging vehicle noise and vibration concern. As the comfort standards have been rising and quieter power trains (quieter engines, hybrid power trains and electric drives) have been introduced, secondary noise sources could become a significant concern. This study investigates the shock absorber knocking noise on 11 fully adjustable, twin-tube gas-filled automotive shock absorbers, using industry standard damper dynamometer, and a new experimental setup involving the adaptation of one of the shakers of a four post rig to perform tests in isolation. Four of the shock absorbers were returned from the field for knocking noise. The noise was successfully reproduced using triangular and sinusoidal wave inputs with frequency of 10 to 20 Hz on the four post rig setup, while no noise was detected on the same shock absorbers with the damper dynamometer setup. Unlike previously published results, the "noisy" shock absorbers could be successfully identified with a high degree of certainty based exclusively on the performance curve that includes the effects of higher frequencies. The inter-cycle inconsistency in performance curve was the main differentiating aspect. The statistical measures proposed have robustly identified the "noisy" shock absorbers. © 2012 Institute of Noise Control Engineering.

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Simulation tool for shock absorber noise prediction in time and frequency domains

Cited by 9 publications

References 7 publications

A shock absorber model for structure-borne noise analyses

A shock absorber model for structure-borne noise analyses

Development of an optimization method for minimizing vibrations of a hydraulic damper

Experimental identification of shock absorber knocking noise using various input waveforms

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