Optimization of the lower arm of a vehicle suspension system for road noise reduction by sensitivity analysis

Jeong

Proceedings of the Institution of Mechanical Engineers, Part D:

et al. 2015

Self Cite

‘Moan’ noise in a vehicle causes discomfort and anxiety to passengers. In the previous study, the causes of moan noise were identified, and a coherence analysis of the components was conducted. It was found that moan noise was generated by the attribution of resonance when the exciting force produced by the stick–slip motion in a brake system was transmitted to a coupled torsional beam axle module. The analysis involved calculation of the response of the coupled torsional beam axle module on a full suspension brake system reconstructed by consideration of the transfer functions and the joint conditions of the coupled torsional beam axle module and the brake system. Each transfer function is decomposed by a frequency-response-function-based substructuring technique. In this study, when using the sensitivity analysis and optimization techniques for moan-noise reduction, the frequency-response-function-based substructuring technique was performed to calculate the response of the modified coupled torsional beam axle module by considering the joint conditions and the transfer functions of the brake system. Highly sensitive design parameters regarding the response of the coupled torsional beam axle module were identified after the sensitivity analysis. The most sensitive design parameters were selected to enhance the efficiency and the robustness of optimization. The optimal values for the design variables were obtained by applying a progressive quadratic response surface method as a optimization algorithm. The application of an optimization technique was possible using the finite element model and the results of the finite element analysis from the previous study. After optimization, a prototype was re-designed, manufactured and tested. Finally, it was verified that the moan noise was reduced, as the natural frequency of 387 Hz for the coupled torsional beam axle module was moved to a higher frequency.

Section: Theoretical Analysismentioning

confidence: 99%

“…This improved response surface method has been commonly used to perform design optimization with application to large-scale and complex structures. 17–21…”

Section: Introductionmentioning

confidence: 99%

Reduction in the moan noise by frequency-response-function-based substructuring and optimization techniques

Jeong

Proceedings of the Institution of Mechanical Engineers, Part D:

et al. 2015

Self Cite

“…Research into the vibration characteristics in the cab is mainly focused on improving vehicle vibration performance by means of transfer path analysis. Reference [2] used mechanical-acoustic transfer path analysis, where the contribution of each body panel to the vibration in the cab is analyzed, to diagnose the structural transmission noise. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Vibration Characteristics of Framed SUV Cab Based on Coupled Transfer Path Analysis

et al. 2019

The vibration transmission paths in a sport-utility vehicle with a frame structure were used to evaluate the coupled vibration of each vibration transmission link. This method was based on the transmission path of an "engine-powertrain mount system-frame-vehicle body suspension-body-driver seat rail," and the research objective was to improve the vibration characteristics of the cab. This coupled transfer path analysis combined analysis and experiment to establish the vehicle vibration transmission path model and a finite element simulation model. With this method, the vibration level of the driver's seat rail was reduced and engineering practice was effectively used to improve the vibration characteristics of the cab. This method was applied to a framed SUV cabin.

“…Major role of front lower control. So front lower control arm need a robust design to sustain higher loading in front suspension but at the same time need a lighter weight to give the optimum performance as the main alignment [7][8]. Commonly, steel material is used to fabricate the lower control arm [8].…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of Front Lower Control Arm (FLCA) for C-Segment Passenger Car

Rahman¹,

Salleh²,

Razak³

et al. 2018

IJET

In this paper, the design optimization and fabrication process of aluminium cast for front lower control arm (FLCA) were investigated. In this work, the new design concept of front lower control arm is employed. CATIA software was employed in this work to design the concept of the lower control arm. After that, Hyperworks software is used to analyze the structural strength and optimized the weight of the part. The target of the new design is 20% reduction of the overall weight of the front lower control arm which fabricated using steel material. The obtained results show a significant reduction of the overall weight as high as 25% with a fatigue life cycle 396,000 cycles. This finding proved that the new design of front lower arm has fulfilled the criteria of fatigue life cycle and suitable to be used in a C-segment passenger car.