【作者】 王芳；

【导师】 杨坚；

【作者基本信息】 广西大学 ， 农业机械化工程， 2008， 硕士

【摘要】 农用运输车（简称农用车）在行驶过程中受路面凹凸不平随机激励产生强烈的振动,严重影响驾驶员的身体健康和操纵稳定性。座椅是车辆的基本装置、直接与人接触,缓和由于路面不平传给人体的冲击以及衰减由此而引起的振动,使驾驶员具有良好的工作条件,开展对座椅悬架在随机振动下的研究具有重要的理论和实际意义。以农用车的X型减振座椅为原型,采用非线性随机振动理论、MATLAB仿真分析软件以及数学解析方法,把人——椅——路面非线性振动系统模型等价为六自由度线性系统,对该系统进行理论分析、建立数学模型并进行数值求解,且通过物理样机试验进行验证,研究了非线性系统等价为线性系统的可行性、人体在随机振动下的均方响应以及座椅各参数和农用车车速对人体舒适度的影响。同时,依据ISO2631标准对影响座椅减振性能的参数采用三因素二次回归正交设计方法进行了优化,优化结果为:主压缩弹簧刚度k₂=8511N/m、副压缩弹簧刚度k₂′=8000N/m、拉伸弹簧刚度k₂″=29823N/m、阻尼器阻尼C=1082N·s/m,此时农用车减振座椅在路面随机激励下传递给人体的加速度均方值在人体敏感频段4-8Hz范围内位于ISO2631振动规范曲线8h以下。通过物理样机试验验证,优化参数之后的座椅悬架具有比原座椅更好的减振性能。更多还原

【Abstract】 The agricultural vehicle would create strong vibration when it had driving because of the random motivation of irregularity road, which influenced the health of driver and steering stability severely. As a basic device of vehicle, it was parts that contacts human directly, it can relax the impact to human from the irregularity road and lighten the vibration, and create a comfortable work conditions for drivers. Therefore, it has important theory and practice meaning to study the seat under the random vibration.Made the X type damp seat of agricultural vehicle as the prototype, equivalent the nonlinear vibration model of human-seat-road to six-degree-of-freedom linear system by the nonlinear vibration theory, and MATLAB simulation software, and mathematical analysis. The system had analyzed by theoretical, and solved by the mathematical models, and verified through physical prototype testing. It had studied the feasibility of nonlinear systems linearization, and the mean square response of human body under the random vibration, and the impact of human comfort with the parameters of seat and the speed of agricultural vehicle. At the same time, the parameters influenced the capability of damp seat has been optimized according to ISO2631 standards. The results proved: when the rigidity k₂ of the main constringent spring was 8511N/m, the rigidity k₂’ of the vice constringent spring was 8000N/m, the rigidity k2" of the drawing-extending spring was 29823N/m and the equivalent damp coefficient C of the damper was 1082N·s/m, the acceleration which transferred from damp seat of agricultural vehicle to human body, that below 8h in the vibration criterion curve of ISO2631 when the frequency ranged from 4 to 8Hz. Through physical prototype test verification, the damping performance of seat suspension that optimized the parameters better than the original seat.更多还原