Optimization of an engine mounting system with consideration of frequency-dependent stiffness and loss factor

Ooi, Lu Ean; Ripin, Zaidi Mohd

doi:10.1177/1077546314547532

Cited by 30 publications

(30 citation statements)

References 30 publications

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“…However, experimental validation was not been carried out during their studies. Lin et al (2005) and Ooi et al (2014) were conducted experiment study to evaluate frequency dependent stiffness and frequency dependent lost factor of rubber mount by using impact technique [8] [9]. However, the authors were not focused on non-linear region small force excitation was applied in the studied and linear region behavior is assumed in the study.…”

Section: Introductionmentioning

confidence: 99%

Experimental Identification On Non Linear Properties of Rubber Mount

Zainudin

Ooi

2018

MATEC Web Conf.

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In actual installation, rubber mount are usually excited by different engine force amplitude and frequency. For better characterization of rubber mount, dynamic properties of metal to rubber mount are tested in this paper by using hysteresis loop method. Stiffness and loss factor of rubber mount are calculated from measured hysteresis loop. Experimental works are carried to identify the non-linearity in the amplitude dependent and frequency dependent properties of rubber mount. the s-shaped of hysteresis loop represent as non-linear behavior of rubber mount. the comparison is done for the dynamic properties of rubber mount under different excitation condition. the non-linear behavior of the rubber mount under excitation forced are reported. the result show stiffness change non-linearly according to different amplitude excitation force under different excitation frequency. the observation is significant especially when the excitations force is higher than 5N for the small metal to the rubber mounts. However this observation is different compared to the condition where excitation frequency getting higher. the non-linearity in the rubber mount is becoming not significant when the excitation frequency is getting higher.

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Section: Introductionmentioning

confidence: 99%

Experimental Identification On Non Linear Properties of Rubber Mount

Zainudin

Ooi

2018

MATEC Web Conf.

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“…Generally, the PMS used in the optimization process was simplified as a 6-DOF rigid model with time-invariant inertial property, 4,7,13,34 as shown in Figure 1(a). A right-hand powertrain coordinate system (PCS) o p − X p Y p Z p is defined.…”

Section: Overview Of the Truck System Modelmentioning

confidence: 99%

“…However, the flexibility of the chassis frame is omitted or not well addressed in these models. The engines of heavy-duty trucks, especially the engines having low idle speed, usually have significant vibration below 100 Hz, 12,13 ; it would excite the lower order modes of the frame. In addition, the lighter weight of the chassis frame and heavier loading capacity of the trucks would make the frame having more dynamic deformation.…”

Section: Introductionmentioning

confidence: 99%

A condensed dynamic model of a heavy-duty truck for optimization of the powertrain mounting system considering the chassis frame flexibility

Tan

Chen

Liao

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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The existing powertrain mounting models of the heavy-duty truck for optimizing the mounts parameters cannot well describe the deformation of the chassis frame. To overcome this disadvantage, a new full vehicle model is proposed which embraces the view of system modeling and includes the frame flexibility. The model can achieve optimal parameters of the Powertrain Mounting System for isolating the vibration transmitted from the powertrain to the chassis. A model reduction technique, improved reduced system, is used to obtain a reduced model of the frame to represent its original large-scale finite element analysis model for the accessibility of time-efficient solutions of the model. The reduced frame model is integrated with the powertrain mounting and suspension model to form the full dynamic model of the vehicle. The accuracy and effectiveness of the proposed model are evaluated by its original vehicle model built in software ADAMS and an existing rigid model with rigid foundation. A hybrid model optimization strategy is also presented to tune the dynamic parameters of the powertrain mounts using the developed coupling model. The simulation results show that the proposed coupling model has better representation of the dynamic characteristics of the real vehicle system, and the presented hybrid model optimization strategy can obtain better optimization results compared with the existing rigid model with rigid foundation. In addition, the application of the proposed model can also be extended to the vibration control and the structural fatigue prediction.

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“…There are many studies in the literature for the minimization of the vibration transmissibility of the powertrain mount by integrating the rigid body models and the design optimization tools. For example, various optimization techniques such as sequential quadratic programming for the mount locations and orientations are employed to minimize the vertical force transmitted [18,19]. In the studies, which are based on the optimal placement of the frequencies of rigid body modes, powertrain modes are decoupled from each other where the location and orientation of the powertrain mounts are chosen as design parameters [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Design sensitivity and optimization of powertrain mount system design parameters for rigid body modes and kinetic energy distributions

Şendur

Tunç

2020

J Braz. Soc. Mech. Sci. Eng.

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This study evaluates the influences of the powertrain mount design parameters on the frequencies of powertrain rigid body modes and their kinetic energy distributions (KEDs), which play an important role in the low-frequency vibration of vehicles. A total of 12 design parameters (x, y, z position of mount locations and translational stiffness of the front and rear powertrain mounts) were evaluated in terms of their contributions to the aforementioned metrics. A multi-body dynamics simulation model was used in a 512-run modal analysis by varying the design variables across their common range, and the results were used in design sensitivity analysis. Response surface models for the frequencies of each powertrain rigid body mode and their KEDs were derived and subsequently used in optimization studies. It was shown that front and rear powertrain mount stiffness in y-direction has a strong influence on the frequency of powertrain lateral mode (21.5% and 24.5%, respectively). Front mount location in the x-direction demonstrates a strong influence on the pitch mode (25.7%), while the rear mount stiffness in the z-direction is the most influential on frequency of powertrain vertical mode with 29.1%. The location of the rear powertrain mount in the z-direction has a significant effect on the KED of fore-aft mode with 37.8% sensitivity. NSGA-II genetic algorithm with 100 generations was used for optimization to meet a set of design targets compiled from the literature. For the placement of the frequencies of powertrain rigid body modes with desired KED, design sensitivities, which are derived from a system-level approach, give important design direction to address the complex interactions between powertrain mount locations and stiffness and key metrics of the powertrain mount systems. Knowledge of design sensitivity of design parameters is important in the vehicle design cycle for OEMs to prioritize their design decisions. Finally, the optimization methodology is key to tune the design parameters to meet the conflicting design targets more efficiently.

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Optimization of an engine mounting system with consideration of frequency-dependent stiffness and loss factor

Cited by 30 publications

References 30 publications

Experimental Identification On Non Linear Properties of Rubber Mount

Experimental Identification On Non Linear Properties of Rubber Mount

A condensed dynamic model of a heavy-duty truck for optimization of the powertrain mounting system considering the chassis frame flexibility

Design sensitivity and optimization of powertrain mount system design parameters for rigid body modes and kinetic energy distributions

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