共查询到18条相似文献,搜索用时 203 毫秒
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运用谐波叠加法建立了C级路面模型,通过模拟迭代将路面不平时间历程转化为激振器的驱动信号,并应用于道路模拟的摩托车平顺性试验测试中。采用两通道轮胎耦合道路模拟试验机对摩托车系统进行了振动试验,分别对驾驶员座垫、脚踏、手把和行李箱位置的振动加速度进行了测试,测试结果表明,行李箱处的振动最大,手把位置和脚踏位置的振动次之,座垫处的振动最小。 相似文献
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摩托车振动测试和分析实例 总被引:1,自引:1,他引:0
综合仪器的测试、试车员的感受和开发人员的分析,对摩托车舒适性进行评价和改进,在目前来说是一种比较实用的方法。将测试结果结合以往对其他多款车型的试验,再综合人体感受情况,得出判定摩托车相关部位振动情况的结论是:1)当振动加速度变化频繁时,摩托车相关部位振动大;2)当振动加速度远大于40m/s^2时,摩托车相关部位有振动出现;3)当振动加速度变化频繁,且远大于40m/s^2时,摩托车相关部位振动严重。 相似文献
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为了掌握既有水泥混凝土路面MHB法碎石化改造时对周围环境的振动特点与影响范围,采用高精度震动测试仪对水泥混凝土路面MHB法碎石化时的施工振动特点、影响范围等进行了现场施工监测。对试验段现场振动测试的振动加速度时程曲线、加速度衰减特性曲线和加速度峰值随振中距衰减曲线的变化进行了对比、分析。表明采用MHB法对旧混凝土路面碎石化施工时所产生的机械振动加速度衰减速度很快,且具有冲击和瞬态振动的特点,对以填方为主在路堤边坡和挖方路堑边坡的安全影响范围与岩土体性质密切相关。通过试验建立了填方路基和挖方边坡的水平加速度和垂直加速度与MHB法碎石化振中距间的负指数和对数关系式,确定了混凝土路面MHB法碎石化振动对填方路基下边坡和挖方路堑上边坡上建筑物影响范围和最小安全距离,分别为5.5 m和25 m。 相似文献
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3整车台架和道路试验验证振动改进效果通过对车架的改进及分析表明,改进方案能改善结构的动态特性,但车架对振动的影响效果还需通过整车振动试验来验证。摩托车乘坐舒适性是评价摩托车性能的一个重要指标,通过对摩托车振动进行评价分析,进而达到控制振动的目的, 相似文献
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Sijing Guo Yilun Liu Lin Xu Xuexun Guo 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2016,54(7):918-942
Traditional shock absorbers provide favourable ride comfort and road handling by dissipating the suspension vibration energy into heat waste. In order to harvest this dissipated energy and improve the vehicle fuel efficiency, many energy-harvesting shock absorbers (EHSAs) have been proposed in recent years. Among them, two types of EHSAs have attracted much attention. One is a traditional EHSA which converts the oscillatory vibration into bidirectional rotation using rack-pinion, ball-screw or other mechanisms. The other EHSA is equipped with a mechanical motion rectifier (MMR) that transforms the bidirectional vibration into unidirectional rotation. Hereinafter, they are referred to as NonMMR-EHSA and MMR-EHSA, respectively. This paper compares their performances with the corresponding traditional shock absorber by using closed-form analysis and numerical simulations on various types of vehicles, including passenger cars, buses and trucks. Results suggest that MMR-EHSA provides better ride performances than NonMMR-EHSA, and that MMR-EHSA is able to improve both the ride comfort and road handling simultaneously over the traditional shock absorber when installed on light-damped, heavy-duty vehicles. Additionally, the optimal parameters of MMR-EHSA are obtained for ride comfort. The optimal solutions (‘Pareto-optimal solutions’) are also obtained by considering the trade-off between ride comfort and road handling. 相似文献
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摩托车后减震器渗漏油问题,除受本身设计、部品结构及总成的耐久性能影响外,还受行驶道路、交通情况等因素影响。减震器中的关键零部件油封,其胶料、结构尺寸及相关部件的接触表面粗糙度和尺寸对漏油影响较大,而且过载使弹簧弯曲对油封单边磨损也会引起渗漏。 相似文献
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当前我国摩托车减震器的发展比1993年出台第1代产品标准时相比已发生了重大变 化,沿用至今的标准已不能满足当前行业发展的要求。制修订摩托车减震器标准应尽快列入日程。 相似文献
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Muhammad Marizwan Abdul Manan András Várhelyi Ali Kemal Çelik Hizal Hanis Hashim 《国际交通安全学会研究报告》2018,42(4):207-220
This study aims to determine risk factors contributing to traffic crashes in 9,176 fatal cases involving motorcycle in Malaysia between 2010 and 2012. For this purpose, both multinomial and mixed models of motorcycle fatal crash outcome based on the number of vehicle involved are estimated. The corresponding model predicts the probability of three fatal crash outcomes: motorcycle single-vehicle fatal crash, motorcycle fatal crash involving another vehicle and motorcycle fatal crash involving two or more vehicles. Several road characteristic and environmental factors are considered including type of road in the hierarchy, location, road geometry, posted speed limit, road marking type, lighting, time of day and weather conditions during the fatal crash. The estimation results suggest that curve road sections, no road marking, smooth, rut and corrugation of road surface and wee hours, i.e. between 00.00 am to 6 am, increase the probability of motorcycle single-vehicle fatal crashes. As for the motorcycle fatal crashes involving multiple vehicles, factors such as expressway, primary and secondary roads, speed limit more than 70 km/h, roads with non-permissible marking, i.e. double lane line and daylight condition are found to cause an increase the probability of their occurrence. The estimation results also suggest that time of day (between 7 pm to 12 pm) has an increasing impact on the probability of motorcycle single-vehicle fatal crashes and motorcycle fatal crashes involving two or more vehicles. Whilst the multinomial logit model was found as more parsimonious, the mixed logit model is likely to capture the unobserved heterogeneity in fatal motorcycle crashes based on the number of vehicles involved due to the underreporting data with two random effect parameters including 70 km/h speed limit and double lane line road marking. 相似文献
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《JSAE Review》1999,20(3):413-419
Diagnosis of the individual function of shock absorbers and coil springs has been simplified by an off-the-car-type tester. We studied methods of analyzing coil springs and shock absorbers independently without removing them from the vehicle. The damping force of the shock absorber itself, excluding the spring effect, can be indicated according to the axle weight/road wheel at the point of displacement 0. 相似文献
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M. K. Verma R. A. Scott L. Segel 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1980,9(4):181-206
The lateral dynamics of an uncontrolled motorcycle, running on a straight, level road surface, is investigated in this paper. The structural compliances in the front and the rear frames of the motorcycle are taken into account by introducing additional degrees of freedom in the analysis. The kinematics of the tires is represented by linear differential equations which are based on the taut-string model of pneumatic tires. The linear differential equations of motion are solved to yield the eigensolutions of the system. Numerical results, obtained for parameters corresponding to a Honda CB750 motorcycle, are presented and discussed. 相似文献
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对汽车平顺性评价方法的探讨与建议 总被引:4,自引:0,他引:4
首先分析了现行国家标准GB4970-1996<汽车平顺性随机输入行驶试验方法>与国际上通行的人体振动评价标准ISO2631-1997的区别.通过道路试验测量了驾驶员坐垫、靠背和脚部的平移振动以及坐垫的旋转振动共lO个方向的振动.分析发现汽车中人体振动的峰值因子一般小于9;而按照GB4970和ISO2631的试验数据对比表明,GB4970在一定程度上低估了人体振动.分析各方向振动所占的比例发现,坐垫垂向振动、靠背前后振动和坐垫侧倾振动影响最大.最后提出了对汽车平顺性评价方法的建议. 相似文献