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Journal of Theoretical and Applied Vibration and Acoustics، جلد ۶، شماره ۲، صفحات ۳۸۸-۴۰۹
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عنوان انگلیسی Investigation of reducing road-induced loads on sensitive payloads carried by road vehicles using a secondary suspension system containing double-ended magnetorheological dampers
چکیده انگلیسی مقاله Usually, payloads are carried on long routes with different road surface conditions and road obstacles by commercial vehicles from factory to destination. These road conditions cause trucks and their cargo to be exposed to shock and vibration of different amplitudes and frequencies that may impose catastrophic damages to delicate sensitive payloads. The aim of this paper is to present a 3-D model of a secondary suspension system, including double-ended magnetorheological dampers in cargo vehicles to protect sensitive cargo against induced excitations due to various road surface roughness. For this purpose, a double-ended magnetorheological damper for acquiring the desired minimum load capacity in an off-state situation and its maximum capacity when feeding 2Amp electric current was modeled, fabricated, and dynamically tested. Functional tests with sinusoidal harmonic inputs at different frequencies were performed using a UTM test machine and applying different electric currents to the damper. Considering these tests results, the parameters of the modified Bouc-Wen model for the damper are identified. Using the updated model for the damper, a 3-D model of the secondary suspension system with four magnetorheological dampers in the four corners of the cargo holder pallet is provided. The impact of the secondary suspension against the loads imposed by three types of road surface profiles, namely the road surface with the long harmonic wave, the bumpy road surface and the road surface with random roughness, is investigated. Furthermore, the effect of various uneven cargo mass arrangements on the magnitude of the dynamic loads of the payload is investigated. The results show that with increasing electric current at different road profiles, the vertical displacement amplitude has an average decrease of 40% in peak and 30% decrease in RMS, and at the same time, the isolation region has acceptable characteristics. These results indicate the proper performance of the proposed secondary suspension system in reducing the dynamic load level in sensitive payloads
کلیدواژه‌های انگلیسی مقاله Secondary suspension system,Magnetorheological Damper,Double-ended damper,Sensitive-payload,Road Vehicle
نویسندگان مقاله Sayyed Samad Samadani Agdam |
Faculty of Mechanical Engineering, University of Tabriz

Kamal Jahani |
Faculty of Mechanical Engineering, University of Tabriz

Mohammad Reza Shabgard |
Faculty of Mechanical Engineering, University of Tabriz

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