Effects of isolators internal resonances on force transmissibility and radiated noise

Du, Yu; Burdisso, Ricardo A.; Nikolaidis, Efstratios; Tiwari, Dhananjay

doi:10.1016/s0022-460x(03)00036-1

Cited by 32 publications

(23 citation statements)

References 7 publications

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“…Additionally, lumped masses are assumed to be rigid with no flexural mode participation, and a known external harmonic disturbance force excites the motor only. The powertrain sub-frame is assumed to be a rigid base to simplify the system, though it is suggested that a flexible base does not significantly alter the vibration isolation capabilities of the mounts [1]. Lastly, it is assumed that motion control of the drive unit is not of concern in the mid-frequency range (where response amplitudes are small).…”

Section: Problem Formulationmentioning

confidence: 99%

“…1(a)) is no longer valid, and dynamic mass participation effects must be considered. This concept is illustrated by Du et al [1] by replacing the elastic model with a continuous mount model consisting of distributed mass, stiffness, and damping properties. Low frequency isolation characteristics remain similar for the force transmissibility, though multiple internal mount resonances now exist in the mid-tohigh frequency range.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Motor Vibration Isolation System with Focus on Mount Resonances for Application to Electric Vehicles

Zeng

Liette

Noll

et al. 2015

SAE Int. J. Alt. Power.

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The vibration isolation effectiveness of powertrain mount configurations is examined for electric vehicle application by considering the effect introduced by internal mount resonances. Unlike internal combustion engines where mounts are typically designed only for static support and low frequency dynamics, electric motors have higher excitation frequencies in a range where mount resonances often occur. The problem is first analytically formulated by considering a simple 3-dimensional powertrain system, and the vibration isolation effectiveness significantly deteriorates at the mount resonance(s). It is shown that by modifying the mount shape, the mount resonance(s) can be shifted while maintaining the same static rate, tuning the frequency away from any engine excitation or natural frequencies. Further, internal mount resonances are utilized to improve vibration isolation over a narrow frequency range, using non-identical mounts to split mount resonance peaks. Then a computational model for a realistic drive unit (containing electric motor, power invertor, and gearbox) is considered. The mount resonance phenomenon is replicated in the computational model, and the effect on non-identical mounts is again examined. Finally, 3 and 4-point mounting schemes are compared, and their parameters (if selected properly) exhibit better vibration isolation over a tunable frequency range of interest.

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Section: Problem Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Motor Vibration Isolation System with Focus on Mount Resonances for Application to Electric Vehicles

Zeng

Liette

Noll

et al. 2015

SAE Int. J. Alt. Power.

View full text Add to dashboard Cite

show abstract

“…Common types of spring-dashpot models which are used in modelling of engine mounts are Kelvin-Voight, Zener and Zener models .considering these three models of spring-dashpot, the Zener model leads to the best fit of the frequency -dependent behaviour of the rubber mounts [6,7]. To avoid of more complexity, the Zener model is chosen for investigation in this study.…”

Section: Spring-dashpot Modelmentioning

confidence: 99%

Selecting appropriate dynamic model for elastomeric engine mounts to approximate experimental FRF data of them

Jahani

2010

EPJ Web of Conferences

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Abstract. In this paper, the capabilities of different dynamic analytical models to approximate experimentally measured FRFs of elastomeric engine mounts of a passenger car are investigated. Artificial neural networks is used in identifying the dynamic characteristics of each model. Impact hammer test is implemented to extract measured FRFs and harmonic analysis is used to get the counterpart response of the models. Here linear and orthotropic material properties are considered for elastomeric media. The frequency response functions of updated models are compared with experimentally detected ones and advantages and limitations of each model to simulate the real dynamic behaviour of elastomeric engine mounts are discussed

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“…Research objects have been developed from rigid models [15,16] to flexible ones [17][18][19], and the performance index has been developed from force or velocity indices [20][21][22] to power flow indices [17,18,23]. Du [24] found that the force transmissibility increased 20∼30 dB, and the noise radiated by the foundation increased about 22 dB when wave effects of isolators are considered. Sanderson [25] emphasized the effects of rotational degree of freedom (DOF) on the total power transmission.…”

Section: Introductionmentioning

confidence: 99%

“…Displacement and acceleration can be yielded from (23) and (24), respectively. In the time domain, the displacement, velocity, and acceleration can be obtained from the following equations, respectively.…”

mentioning

confidence: 99%

Vibratory Power Flow Analysis of a Gear‐Housing‐Foundation Coupled System

Ren

Chang

Liu

et al. 2018

Shock and Vibration

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The marine gearbox is usually installed on a vibration isolation system in order to reduce oscillation transmitted to the ship foundation. However, researches on vibration transmission in the gear-housing system and isolation system are currently independent. With the increasing requirement of lower vibration, a coupled model needs to be built to control the vibration propagation from a view of the whole system. Considering the mesh transmission error excitation of a gear pair, a flexible gearhousing-foundation coupled impedance model is constructed in this paper, and the vibratory power flow of the whole system is calculated. Power transmissions between three different gearbox installation configurations, that is, rigid installation, singlestage isolation, and double-stage isolation, are compared. Taking the single-stage isolation configuration as an example, parameter influences on the vibration of the foundation are studied. Results show that double-stage isolation can achieve lower vibration than single-stage isolation; decrease in bearing stiffness or Young's modulus of isolator will yield better vibration isolation performance; housing damping and isolator damping are beneficial to vibration reduction.

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Effects of isolators internal resonances on force transmissibility and radiated noise

Cited by 32 publications

References 7 publications

Analysis of Motor Vibration Isolation System with Focus on Mount Resonances for Application to Electric Vehicles

Analysis of Motor Vibration Isolation System with Focus on Mount Resonances for Application to Electric Vehicles

Selecting appropriate dynamic model for elastomeric engine mounts to approximate experimental FRF data of them

Vibratory Power Flow Analysis of a Gear‐Housing‐Foundation Coupled System

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