The Assessment of Ride Quality of a Full Tractor and Trailer

• Main Authors: Hu, Po-I, 胡伯義
• Other Authors: Wang Bor-Tsuen
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/10126623593417567144

碩士 === 國立屏東技術學院 === 機械工程技術研究所 === 84 === This thesis presents an analytical model for the evaluation of ride quality of tractor and trailer moving on an irregular road surface. The tractor and trailer bodies are assumed to be rigid and subjected to the vertical and pitch response only. The suspension systems are considered to be linear viscouslly- damped spring elements. The tires are assumed to be linear viscouslly-damped and vL elastic models respectively. The vehicle is assumed to be symmetric along the moving direction. The wheel axle is modeled as an unsprung mass unit. Two full tractor and trailer riding models are developed and assumed to have the same displacement inputs of stationary ergodic Gaussian random road profile. The frequency response functions of the two systems are derived so as to determine the power spectral density functions of the system response. A conventional tractor and trailer is then used to simulate the vehicle response, and so forth the ride quality can be studied. The ride comfort of the driver is evaluated in comparison to the ISO 2631. The suspension travel, road holding, dynamic tire force and the tractor and trailer body accelerations that can affect the ride quality of parts and cargo are also studied for the two vehicle models. The effects of the vehicle speeds, road roughness and laden conditions on ride quality are systematically evaluated. The analysis of means (ANOM) is also applied to the system parameter analysis to study their inter- reactions and select the sub-optimum values. keywords: Full Tractor and Trailer, Vehicle Model, Viscoelastic Tire, Random Vibration, Suspension Travel.