Effect of non-proportional damping on the torque roll axis decoupling of an engine mounting system

Park, Jae-Yeol; Singh, Rajendra

doi:10.1016/j.jsv.2007.12.007

Cited by 37 publications

(36 citation statements)

References 10 publications

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“…The torque roll axis (TRA) could be decoupled for a proportionally or non-proportionally damped system by judiciously selecting mount parameters, locations, orientation angles, and stiffness ratios as suggested by Jeong and Singh [2] and more recently Park and Singh [3]. Even though significant coupling takes place when spectrally-varying mounts are employed, decoupling is still possible for a focalized mounting system (with 0 φ =° and =0 mm z r ).…”

Section: Results and Disscussionmentioning

confidence: 99%

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Vibration Analysis of Powertrain Mounting System with a Combination of Active and Passive Isolators with Spectrally-varying Properties

Park¹,

Singh²

2009

SAE Int. J. Passeng. Cars – Mech. Syst.

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Most of the prior work on active mounting systems has been conducted in the context of a single degree-offreedom even though the vehicle powertrain is a six degree-of-freedom isolation system.We seek to overcome this deficiency by proposing a new six degreeof-freedom analytical model of the powertrain system with a combination of active and passive mounts. All stiffness and damping elements contain spectrallyvarying properties and we examine powertrain motions when excited by an oscillating torque. Two methods are developed that describe the mount elements via a transfer function (in Laplace domain). New analytical formulations are verified by comparing the frequency responses with numerical results obtained by the direct inversion method (based on Voigt type mount model). Eigensolutions of a spectrally varying mounting system are also predicted by new models. Complex eigenvalue problem formulation with spectrally-varying properties provides a closer match with experimental results than the real eigenvalue formulation with frequencyindependent mounts. Given the spectral variance in the mount properties, a simple roll mode decoupling scheme is suggested for the powertrain isolation system. Then, the role of active path is clarified by comparison with no actuator operation.Multi-dimensional motions (especially coupling) are predicted and in particular the effects of active mount parameters such as the orientation angle, location and actuator input are investigated from the motion coupling perspective.

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Section: Results and Disscussionmentioning

confidence: 99%

“…To apply the complex modal method to a nonconservative discrete system, Eq. (27) is cast in the state-space, first order system form [3] as:…”

Section: Tp Tp Tpmentioning

confidence: 99%

Vibration Analysis of Powertrain Mounting System with a Combination of Active and Passive Isolators with Spectrally-varying Properties

Park¹,

Singh²

2009

SAE Int. J. Passeng. Cars – Mech. Syst.

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“…All excitation and dynamic reaction forces should eventually be transformed into one coordinate system. Namely, the system should be analyzed in Γ TRA to better facilitate implementation of TRA decoupling [8][9][10][11]. Kim [34] has argued that full decoupling is not possible for completely arbitrary mount locations.…”

Section: System Configurationsmentioning

confidence: 99%

“…Control of rigid body motions and reduction of transmitted (vibratory) forces is commonly accomplished using passive methods [1][2][3][4][5][6][7][8][9][10][11] with adequate success. However, growing consumer expectations (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Further, capabilities may be improved through passive physical decoupling of the system motions. For example, proper powertrain mounting system design decouples all rotational and translation motions from the powertrain torque roll axis (TRA) given a torque pulse excitation [8][9][10][11]. Yet this introduces additional limitations, such as unrealistic mounting locations and packaging (geometric) space issues [11].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Motion Control of Powertrain Using a Combination of Active and Passive Mounts

Liette

Singh

2015

Volume 2: Diagnostics and Detection; Drilling; Dynamics and Control of Wind Energy Systems; Energy Harvesting; Estimation and I

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Vibration control of a realistic coupled powertrain and frame system is analytically and computationally studied using a combination of active and passive mounts. Actuators are placed in the powertrain paths for active control, and passive mounts are employed such that the powertrain roll motion is dominant using the torque roll axis motion decoupling concept. To facilitate this study, a new 24 degree of freedom mathematical model for a coupled powertrain and frame is developed with versatility where passive only, active only, or combined active and passive powertrain paths can be selected. Active control forces are defined as constant, real valued amplitudes to counteract the dominate powertrain roll motion. Alternate path models are then quantitatively compared based on the global powertrain motion magnitudes. It is found that superior vibration control is achieved with combined paths, provided all powertrain paths are aligned with the torque roll axis coordinates. Additionally, successful control is dependent on which paths are selected as a combination of active and passive mounts, dictated by the interaction between active control forces and the passive system dynamics. 5 y g ε , (iii) 5 z g ε , (iv) 5 x g θ , (v) 5 y g θ , and (vi) 5 z g θ for alternate models: (a) Model A and (b) Model B. Key: (a) − −, Model A1; ···, Model A1 with low damping; -, Model A2 and (b) − −, Model B1; -, Model B2.

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The optimal design of the mounting rubber system for reducing vibration of the air compressor focusing on complex dynamic stiffness

2021

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Effect of non-proportional damping on the torque roll axis decoupling of an engine mounting system

Cited by 37 publications

References 10 publications

Vibration Analysis of Powertrain Mounting System with a Combination of Active and Passive Isolators with Spectrally-varying Properties

Vibration Analysis of Powertrain Mounting System with a Combination of Active and Passive Isolators with Spectrally-varying Properties

Enhanced Motion Control of Powertrain Using a Combination of Active and Passive Mounts

The optimal design of the mounting rubber system for reducing vibration of the air compressor focusing on complex dynamic stiffness

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