A Systematic Approach Towards Engine Mounting System Vibration Isolation Performance Validation in Commercial Vehicles

Channamaneni, Rajesh Babu; Kannan, P.; Padavala, Prasad

doi:10.4271/2017-28-1928

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…A mount system with satisfactory dynamic characteristics can effectively improve the NVH performance. [1][2][3][4][5] As shown in Figure 1, a powertrain mount system consists of powertrain side mount bracket, rubber vibration isolator, and body side mount bracket connected in series. Since the rubber isolator and brackets are arranged in series, if the stiffness of the bracket is very large, then the stiffness of the rubber isolator and brackets is approximately the stiffness of the rubber isolator.…”

Section: Introductionmentioning

confidence: 99%

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Finite Element Model refinement of powertrain mount brackets for estimating natural frequencies

Pang

Yang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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Natural frequencies of powertrain mount brackets have great influences on NVH (Noise, Vibration, Harshness) performances of a Powertrain Mount System. Usually, large relative error between the measured- and the estimated natural frequencies using finite element analysis existed. In this paper, a methodology to refine the mount bracket finite element model is proposed based on global response surface method and optimization methods. The material parameters uncertainty and the constraint boundary (bolt joint) are taken into account for model update parameters, since they are the main factors affecting the accuracy of the calculated natural frequencies of bracket. The material parameters are optimized by minimizing the errors between calculated and measured un-constrained natural frequencies of the mount bracket. The bolt joint are modeled using the equivalent stiffness of spring element that are optimized by minimizing the deviations between the calculated and measured constrained natural frequencies of the bracket. Another mount bracket is used to obtain natural frequencies calculated using the refined finite element model and measured, and the comparisons of the calculated versus the measured natural frequencies shown that the refined finite element model of mount bracket with identified material parameters and boundary stiffness values exhibits high prediction precision for estimating natural frequencies of the brackets. This indicates that the proposed finite element model refinement methodology for mount bracket is effective and can help the NVH engineers to design larger natural frequencies of mount brackets.

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Section: Introductionmentioning

confidence: 99%

“…A mount system with satisfactory dynamic characteristics can effectively improve the NVH performance. 1–5…”

Section: Introductionmentioning

confidence: 99%

Finite Element Model refinement of powertrain mount brackets for estimating natural frequencies

Pang

Yang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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Influence of a Powertrain Mounting Method on Powertrain Vibration

Vopařil

Prokop

Řehák

2020

2020 19th International Conference on Mechatronics - Mechatronika (ME)

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Influence of Exhaust Aftertreatment System on Powertrain Vibration Behavior

Sarna,

Singh,

Kumar

et al. 2024

SAE Int. J. Commer. Veh.

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<div>NVH refinement of commercial vehicles is the key attribute for customer acceptance. Engine and road irregularities are the two major factors responsible for the same. During powertrain isolators’ design alone, the mass and inertia of the powertrain are usually considered, but in practical scenarios, a directly coupled subsystem also disturbs the boundary conditions for design. Due to the upgradation in emission norms, the exhaust aftertreatment system of modern automotive vehicles becomes heavier and more complex. This system is further coupled to the powertrain through a flexible joint or fixed joint, which results in the disturbance of the performance of the isolators.</div> <div>Therefore, to address this, the isolators design study is done by considering a multi-body dynamics model of vehicles with 16 DOF and 22 DOF problems, which is capable to simulate static and dynamic real-life events of vehicles. Design indicators are thoroughly analyzed and validated through the rigid body modes and real field events of the vehicle. As most of the research is done for four-point mounting powertrain systems by considering 6 DOF or 12 DOF in commercial vehicles but a novel approach with a 22 DOF model is proposed in this study to predict the impact of the inclusion of the exhaust aftertreatment system on torque roll axis and rigid body modes decoupling.</div> <div>The results of the proposed system show that the rigid body mode decoupling of the powertrain system improved and consequently the overall NVH performance of the vehicle in real life is further improved. Therefore, it is suggested from the study that ignoring the inclusion of the exhaust aftertreatment system in the powertrain mounting system design reduces the NVH performance of the vehicle, hence it is recommended to include it in the early phase of design.</div>

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A Systematic Approach Towards Engine Mounting System Vibration Isolation Performance Validation in Commercial Vehicles

Cited by 4 publications

References 3 publications

Finite Element Model refinement of powertrain mount brackets for estimating natural frequencies

Finite Element Model refinement of powertrain mount brackets for estimating natural frequencies

Influence of a Powertrain Mounting Method on Powertrain Vibration

Influence of Exhaust Aftertreatment System on Powertrain Vibration Behavior

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