Optimum Engine Mounting Layout by Genetic Algorithm

Sakai, Tetsuya; Iwahara, Mitsuo; Shirai, Yutaka; Hagiwara, Ichiro

doi:10.4271/2001-01-2810

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…In other words, the engine lateral movement occurs when the engine input torque N x ͑t͒ is added to the crankshaft. Therefore, the decoupled layout of the y − mode is most important for the prevention of uncomfortable lateral movement [5][6][7][8][9][10] . Figure 3 shows the relation between C.O.G.…”

Section: Effect Of Vibration Isolationmentioning

confidence: 99%

Development of an air spring engine mount system for a medium duty truck

Sakai

Daimaruya

Shi³

et al. 2010

Noise Control Eng. J.

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A collaborative research project between universities, a public laboratory, vehicle engineering and testing companies was formed and a prototype vehicle with a diesel engine mounted on four air springs was designed. Concurrently, Genetic Algorithm (hereafter GA) was also implemented to optimize the parameters related to the engine mounting layout, the calculations of the stiffness matrix and the inverse stiffness matrix to prevent the coupled of lateral and rolling vibrational modes, and to obtain the displacement of each mounting point. Finally, the best engine mounting layout was selected for the installation of four air springs to minimize torque roll. Also, the original engine mount layout with cushion rubbers was completely changed to enable installation of four air springs, two lateral and tension rods, and four shock absorbers for the reduction of large engine movements against transient engine torque at engine start and stop, and gear changes. Two leveling valves were also attached to the frame to maintain engine height against large engine torque. As a result, the engine vertical vibration level at 19.1 Hz dropped below 20% of the level designed with the cushion rubber installed on the current vehicle and the engine displacement with the largest torque was within the limit. Further study such as vehicle durability testing is necessary, but the air spring is very useful as a vibration isolation tool for diesel engine mounting layouts. © 2010 Institute of Noise Control Engineering.

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Section: Effect Of Vibration Isolationmentioning

confidence: 99%

Development of an air spring engine mount system for a medium duty truck

Sakai

Daimaruya

Shi³

et al. 2010

Noise Control Eng. J.

Self Cite

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“…In order to resolve these problems, numerous research studies have been carried out on passive, semiactive and active engine mounts. 1,2 Passive rubber engine mounts have been widely developed and commercialized to isolate vibration, because they are cost effective and maintenance free. The primary function of a passive engine mount is to attenuate high-frequency vibrations.…”

Section: Introductionmentioning

confidence: 99%

Vibration control of the engine body of a vehicle utilizing the magnetorheological roll mount and the piezostack right-hand mount

Jeon

Han

Lee

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part D:

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In this study, a new controllable engine mounting system for vibration control of passenger vehicles is proposed. The proposed mounting system consists of two smart material actuators: a piezostack actuator and a magnetorheological-fluid actuator. First, the dynamic responses of an in-line four-cylinder engine supported by three rubber mounts are mathematically analysed by considering the six-degree-of-freedom motion of the engine body, whose excitation is generated by the inner forces during the engine combustion process. Second, the proper positions of the two actuators are determined. Two magnetorheological mounts are used as roll mounts, and one piezostack mount is used as the right-hand mount, in order to reduce the unwanted engine vibration in a broadband frequency range. Third, the piezostack mount and the magnetorheological mount are designed and manufactured, followed by installation in the engine mounting system. Subsequently, for effective vibration isolation, a sliding-mode controller, which is robust to disturbances and system uncertainties, is designed. Finally, in order to demonstrate the effectiveness of the proposed new engine mounting system, vibration control performances are evaluated by adopting the hardware-in-the-loop simulation test method associated with the sliding-mode controller. The vibration control responses are presented at various engine operating speeds in the time domain and the frequency domain. It was found that the vibration control performance is improved by 30% at an engine speed of 750 r/min and by 17% at an engine speed of 2000 r/min using the proposed engine mounting system associated with the controllers.

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“…Here the authors compared the performance of GA with a standard simplex search algorithm. In [11], genetic algorithm was used to solve an engine mount optimization problem. In their work, the optimization problem was limited to minimization of off-diagonal terms of the stiffness matrix.…”

Section: Introductionmentioning

confidence: 99%

Application of Evolutionary Computation in Automotive Powertrain Mount Tuning

Akanda

Adulla

2005

Shock and Vibration

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Engine mount tuning is a multi-disciplinary exercise since it affects Idle-shake, Road-shake and power-train noise response. Engine inertia is often used as a tuned absorber for controlling suspension resonance related road-shake issues. Last but not least, vehicle ride and handling may also be affected by mount tuning. In this work, Torque-Roll-Axis (TRA) decoupling of the rigid powertrain was used as a starting point for mount tuning. Nodal point of flexible powertrain bending was used to define the envelop for transmission mount locations. The frequency corresponding to the decoupled roll mode of the rigid powertrain was then adjusted for idle-shake and road-shake response management.A TRA decoupling procedure, cast as a multi-objective optimization problem, was applied to a body-on-frame sport-utility vehicle powertrain system. In addition to a standard gradient based optimization algorithm, available in commercial finite element software, an evolutionary computation paradigm known as Evolutionary Strategies (ES) was used to solve the optimization problem. The primary advantages of evolutionary computation over gradient based algorithms are as follows: i) They are less likely to get trapped in local minima and less dependent on initial values of the design parameters and therefore able to handle multi-modal optimization problems unlike gradient based algorithms, ii) They produce a population of viable solutions, unlike gradient based algorithms which yields a single solution. The second advantage is very attractive in a production environment since packaging and other multi-disciplinary constraints often require multiple quality solutions for the same problem. The process outlined in this work was verified by exercising a full-vehicle finite element model. The process produced a set of production feasible powertrain mount parameters for acceptable idle and road shake performance.

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Optimum Engine Mounting Layout by Genetic Algorithm

Cited by 8 publications

References 6 publications

Development of an air spring engine mount system for a medium duty truck

Development of an air spring engine mount system for a medium duty truck

Vibration control of the engine body of a vehicle utilizing the magnetorheological roll mount and the piezostack right-hand mount

Application of Evolutionary Computation in Automotive Powertrain Mount Tuning

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