Optimal Design and Simulation of Vibrational Isolation Systems

Spiekermann, Charles E.; Radcliffe, Clark J.; Goodman, Erik D.

doi:10.1115/1.3258720

Cited by 35 publications

(22 citation statements)

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“…For the sake of illustration, we examine the modes of a V6 diesel engine isolation system [6]. The inertia property is close to be symmetric with respect to crankshaft axis and four mounts are also placed in nearly symmetric locations.…”

Section: Results and Disscussionmentioning

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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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%

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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“…The rigid body model consists of six DOFs including three translation and three rotation modes, respectively. Under the assumption of "small" motion, the mounting system equation can be written as follows [4][5][6][7][8]. When computing the natural frequency of the work stage, the damping and excitation forces are not considered in this equation.…”

Section: Work Stage Of Packaging Equipmentmentioning

confidence: 99%

Optimal design of work stage mounting system of precision packaging equipment

Jing

Liu

et al. 2012

2012 13th International Conference on Electronic Packaging Technology &Amp; High Density Packaging

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High precision packaging equipments need high precision isolator to reduce the vibration transmission from outside to work stage. Nowadays, a useful and effective way for vibration isolating is to employ the proper mounting systems to reduce the vibration. One useful method for helping the design engineer to develop more effective mounting systems is through optimization techniques. Sequential Quadratic Programming (SQP) is an effective optimization technique in many engineering fields. In this paper, design optimization of work stage mounting system based on SQP method for vibration control is presented. The optimization objective is to fmd the highest decoupling ratio of the each mount while selecting the stiffness and orientations of individual mount. The constraints are imposed to keep the desired decoupled ratio in each orientation and the frequency corresponding to the decoupled ratio. A case study is given to validate the proposed method. The result shows that the value of optimized system, such as decoupling ratio, is improved significantly. Therefore, the method proposed in this paper is effective for the optimization of work stage mounting system.

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“…Demic 1 optimized ride comfort and controllability of passenger vehicles by minimizing vertical and angular oscillations. In other studies, Bernard and Starkey 2 and Spiekermann et al 3 attempted to reduce large transmitted forces by moving the system natural frequencies away from an undesired frequency range. In their simulation, the engine was modeled as a rigid body with six degrees of freedom (DOF), and the design parameters were the stiffness and orientation of each mount.…”

Section: Introductionmentioning

confidence: 98%

Optimization of aircraft engine suspension systems

Swanson

Ashrafiuon

1993

Journal of Aircraft

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An interactive computer program has been developed to design aircraft engine mounting systems used for vibration isolation. Mount design is largely driven by two competing criteria. Mounts must be soft enough to provide vibration isolation, yet stiff enough to support the engine without excessive motions. The constrained variable metric optimization technique is used to determine the mount design parameters which minimize the transmitted forces in the mounts, subject to constraints on the maximum allowable deflection of the engine to static forces. The design parameters are the stiffness and orientation of each individual engine mount. The aircraft engine is modeled as a rigid body that is mounted to a rigid base representing the nacelle. An example is used to show that the optimization technique is effective in designing engine mounting system.

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Optimal Design and Simulation of Vibrational Isolation Systems

Cited by 35 publications

References 0 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

Optimal design of work stage mounting system of precision packaging equipment

Optimization of aircraft engine suspension systems

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