A shock absorber model for structure-borne noise analyses

Benaziz, Marouane; Nacivet, S.; Thouverez, Fabrice

doi:10.1016/j.jsv.2015.03.034

Cited by 36 publications

(21 citation statements)

References 32 publications

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“…The oscillation of the body panels creates noise in the passenger compartment. In [4] the propagation of vibrations through the shock absorber for the frequency range 200-800 Hz is studied.…”

Section: Introductionmentioning

confidence: 99%

Investigation of damping properties of telescopic shock absorber and its rubber mounts in frequency range 50-150 Hz

Kunchev

Georgiev

2019

Engineering for Rural Development

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The pneumatic tyre is excited by the road unevenness at a frequency close to its first radial mode for the speeds of 50-60 km•h-1. The first resonance of the belt of a radial-type pneumatic tyre has a frequency about 100 Hz. These oscillations are associated with amplitudes of displacement less than 1 mm. The vibrations at the resonance frequency go through the suspension elements and reach the vehicle body without noticeably reducing their amplitude. These high frequency vibrations have a major role in the vibro-acoustic comfort in the passenger compartment of a vehicle. The telescopic shock absorber is one of the suspension components. In the frequency range up to 20 Hz, it has a fundamental role in damping the oscillations generated by the road unevenness. In the frequency range of the natural modes of both sprung and unsprung masses (0.9-12 Hz), the displacements between both ends of a shock absorber are over 5 mm. High-frequency vibrations with an amplitude less than 1 mm do not activate the shock absorber damping properties. The amplitudes are not big enough to create the necessary pressure drop between the two chambers above and under the piston and to provide viscous damping. Other elements that have an influence on damping vibrations with frequencies above 50 Hz are the rubber mounts of the shock absorber. The work explores the behaviour of a telescopic shock absorber and its rubber mounts in the frequency domain determined by the resonances of the pneumatic tyre belt. A method for obtaining the damping coefficient of the rubber mounts for the shock absorberis presented. The purpose of the work is to determine the influence of the damping properties of the shock absorber and its rubber mounts on the vibrational behaviour of the suspension in the frequency range 50-150 Hz. The results of the work can be used to select a proper shock absorber and its rubber mounts, in order to improve the vibro-acoustic comfort of the passenger compartment.

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Section: Introductionmentioning

confidence: 99%

Investigation of damping properties of telescopic shock absorber and its rubber mounts in frequency range 50-150 Hz

Kunchev

Georgiev

2019

Engineering for Rural Development

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“…The damping effect is determined by the size of the damping hole and the viscosity of the hydraulic oil. 30–32 In the traditional pump control system, replenishing parallel valve control and leaking parallel valve control are adopted to increase the damping ratio of the system and reduce the speed stiffness. The dynamic response of the system can be improved and the smooth transition of the motion can be realized.…”

Section: Introductionmentioning

confidence: 99%

The method of restraining hydraulic impact with active adjusting variable damping

Wang

Quan

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Hydraulic impact is a common phenomenon in the hydraulic transmission system, which has great influence on the smooth operation of hydraulic transmission system and the service life of hydraulic components, especially to the hydraulic system with large inertia load. In order to restrain the hydraulic impact, the causes for hydraulic impact are analyzed, and a new method of active adjusting variable damping was developed. The principle of this method is to make use of the reserving signal to predict the timing of the hydraulic shock wave actively and adjust the opening size of the damped hole accordingly to restrain the hydraulic impact. This method was applied to the hydraulic system of a cinder scraper's rail trolley as a case study through simulation and experimental testing. The results show that the method has the advantages of quick response speed, effective restraint of hydraulic impact in the system and low energy consumption. By using this method, the hydraulic impact in the hydraulic system of the cinder scraper's rail trolley can be effectively controlled without affecting the response speed of the system.

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“…The discontinuity in damping response can be connected to friction between the piston and the inner tube, opening and closing of valves (Benaziz et al, 2015;Benaziz et al, 2015) and oil behaviour flowing through these valves (Lauweyrs et al, 2000). Several studies (Lauweyrs et al, 2000;Benaziz et al, 2015;Yung et al, 2006) have shown that high-frequency forces achieve the maximum of 1 kHz, where lower frequencies have greater representation. Another shock absorber issue is cavitation which occurs at the compression phase of the cycle (Dixon, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…But sound energy was measured in the car interior as well. Benaziz (2015) developed a model of the shock absorber for predicting structure-borne noise. This model considered valve stiction and spring valve dynamics as possible sources of the noise.…”

Section: Introductionmentioning

confidence: 99%

Experimental Methodology for Acoustic Diagnostics of Shock Absorbers

Halama

Klapka

Mazůrek

2018

Acta Univ. Agric. Silvic. Mendelianae Brun.

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The application of acoustic measurements brings about a new diagnostic method for evaluating the conditions of shock absorbers. In shock absorber diagnostics, it is advantageous to observe and understand what phenomena occur during the working cycle in the inner tube. Using a non‑destructive and non‑contact method can avoid dismantling whole device. For the research of this new acoustic method, a classic sound meter, an automotive and a train shock absorber were used. FFT analysis and concurrent filtration were applied for the measurement evaluation of obtained data. It has been proven that applying acoustic methods can lead to diagnostics of aeration in the shock absorbers. A defective shock absorber changes its damping characteristics as well as noise radiation compared with the properly functioning one; these differences in noise are measurable and quantifiable. The results show that characteristics of acoustic radiation of the aerated shock absorbers relate to the shock construction type.

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A shock absorber model for structure-borne noise analyses

Cited by 36 publications

References 32 publications

Investigation of damping properties of telescopic shock absorber and its rubber mounts in frequency range 50-150 Hz

Investigation of damping properties of telescopic shock absorber and its rubber mounts in frequency range 50-150 Hz

The method of restraining hydraulic impact with active adjusting variable damping

Experimental Methodology for Acoustic Diagnostics of Shock Absorbers

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