共查询到15条相似文献,搜索用时 46 毫秒
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针对轿车涂装生产过程中,车身随横移机在生产线上移动、翻转,处于非关闭状态的侧门存在的开启定位不牢固,辅具易脱落、使用不方便等问题,本文以奇瑞某一车型为基础,设计开发了一款定位辅具,结构简单、性能可靠、使用方便,能够满足生产需要。 相似文献
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钢板热冲压成形是实现车身轻量化的重要工艺途径。为了提升零件服役性能,提高热冲压生产节拍,结合激光拼焊板(TWB)技术,开展了热冲压一体式门环的成形模具与工艺技术研究,最终制作成功合格的热冲压门环零件。 相似文献
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铝合金油箱端盖在压型后,变形很大、外形尺寸较大、扭斜、不平整,难以达到装配要求,本文通过使用(自制专用)设备,对压型后的端盖施加外力,改变其外形,从而解决此问题。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(9):659-674
A 7-DOF full-car model with optimal active control suspension is utilized to evaluate the vehicle dynamic performances which are achieved through proposed controllers. The optimal controller, which includes the integral action for the suspension deflection, considerably improves the attitude control of a vehicle because the rolling and pitching motion in cornering and braking maneuvers are reduced, respectively. In the viewpoint of level control, the integral control acting on the suspension deflection results in the zero steady-state deflection in response to static body forces and ramp road input. The dynamic characteristics of the suspension control system are evaluated in terms of time domain and frequency domain. The simulations in the time domain demonstrate the advantages of the active suspension system obtained by penalizing the integral and derivative of suspension deflections and the derivative of roll and pitch angles in the performance index. The frequency characteristic curves obtained by simulations regarding integral action or derivative action show the increase of both ride comfort and road-holding performances by maximizing the use of suspension deflections. The potential of derivative control is shown by the performances of the car traveling over a bump and braking. 相似文献
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I. Youn J. Im M. Tomizuka 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2006,44(9):659-674
A 7-DOF full-car model with optimal active control suspension is utilized to evaluate the vehicle dynamic performances which are achieved through proposed controllers. The optimal controller, which includes the integral action for the suspension deflection, considerably improves the attitude control of a vehicle because the rolling and pitching motion in cornering and braking maneuvers are reduced, respectively. In the viewpoint of level control, the integral control acting on the suspension deflection results in the zero steady-state deflection in response to static body forces and ramp road input. The dynamic characteristics of the suspension control system are evaluated in terms of time domain and frequency domain. The simulations in the time domain demonstrate the advantages of the active suspension system obtained by penalizing the integral and derivative of suspension deflections and the derivative of roll and pitch angles in the performance index. The frequency characteristic curves obtained by simulations regarding integral action or derivative action show the increase of both ride comfort and road-holding performances by maximizing the use of suspension deflections. The potential of derivative control is shown by the performances of the car traveling over a bump and braking. 相似文献
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浅埋偏压状态下软弱泥质页岩隧道洞室及围岩的稳定分析 总被引:6,自引:0,他引:6
针对常张高速公路关口垭软弱泥质页岩的特点,采用三维有限元数值计算方法,分析了浅埋偏压隧道围岩受力特征、隧道洞室及围岩的稳定性,从而为软弱泥质页岩隧道工程的修建提供依据和积累经验。 相似文献