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介绍了所研制的D(T)N2-200(400)型汽车制动蹄用凸焊机的设计原理,基本结构以及KD(T)-2051型微机控制器的控制原理,性能及特点,指出单片机恒流控制器具有精度高,功能强及性能稳定等特点,具有很好的应用和发展前景。 相似文献
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轻型电动客车车身—车架的有限元结构分析及试验研究 总被引:13,自引:0,他引:13
应用有限元分析软件,对EV-6580轻型电动客车的车身和车架进行了结构分析计算,并对实车进行了相应的静态及动态试验,证明了电动汽车车身及车架的轻量化潜力。 相似文献
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本文介绍了在90-5高强度高专心性球铁曲轴铸件的生产中所做的系统的试验研究工作,采用高温低硫原铁水,严格控制Mn,P含量,采用Cu或Cu,Ni合金元素,用含Ca低Mg低稀土球化剂处理及75Fe-Si随流孕育和低碳奥氏体正火处理,在试验室Y型试块性能可达到QT90-5的要求,经生产验证曲轴本体性能达到WT85-4,已意大利曲轴本体性能水平。 相似文献
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论现代汽车的制动性能及对策 总被引:1,自引:1,他引:1
建立在开环系统上的传统制动性能概念导致人物力力的浪费。事实上制动性能是人-车-环境闭环系统的特性,这一重要的立场将给出有关制动性能的一些新概念,对对策产生重大的影响。本文综合分析了若干文献及作者实践经验,提出了对策。 相似文献
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HM-I(复合高模量剂)/SBS复合改性沥青综合了高模量沥青与SBS改性沥青的优势,能显著提升混合料的高温性能。采用残留稳定试验、冻融劈裂试验、低温弯曲试验、车辙试验、四点弯曲疲劳试验及动态模量试验,分析HM-I/SBS复合改性高模量沥青混合料的路用性能及动态力学性能,并与基质沥青+硬质沥青颗粒及HM-I/基质沥青所制备的混合料进行对比。结果表明,HM-I/SBS复合改性高模量沥青混合料的高温性能、低温性能、水稳定性、抗疲劳性能及动态模量值更为优异,且各项技术指标均满足高模量沥青混合料的需求。 相似文献
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汽车动力总成液阻型橡胶隔振器的研究发展 总被引:7,自引:0,他引:7
本文对被动式液阻型橡胶悬置及动力总成-液阻悬置系统的设计分析方法和研究成果进行了较系统的述评和总结。首先介绍了汽车动力总成液阻悬置的应用概况,总结,阐述了汽车动力总成悬置系统所要求的理想隔振特性,然后综述了节流孔型,惯性通道型,惯性通道-固定解耦膜型,惯性通道-活动解耦膜型等典型被动式液阻悬置元件的结构原理,集中参数模型,动态特性及其参数设计分析结果,同时综述了动力总成-液阻悬置系统隔振生能研究概况及设计分析方法,其中着重介绍了德国Freudenberg公司,美国Ohio州立大学,日本Nissan公司等主要研究者的研究工作及结果。 相似文献
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目前,国际上性能十分优异的工程塑料-尼龙12被广泛应用在燃油管路系统及汽车气动管理系统,介绍了尼龙12材料的密度,熔点,吸水性及抗冲击强度等性能,阐述了该材料在汽车上应用的优越性及发展趋势。 相似文献
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针对主动悬架用直线电机高精度与高效率的控制需求,充分研究直线电机以及主动悬架动力学特性,建立直线电机驱动模型与主动悬架二自由度参考模型。为了改善传统直线电机直接推力控制的动态性能,提出一种改进的模型预测推力控制方法。该方法将逆变器产生的7个非零电压矢量作为备选矢量,并融合预测模型来计算出控制周期内的电机运行状态参数,基于成本函数最小值原理挑选出最优电压矢量,并将其作用于逆变器产生驱动电机所需的电压。为了解决数字控制系统的固有问题,提出延时补偿技术,保证对电机能够进行实时控制;对于逆变器开关频率不固定而引起的开关损耗等问题,通过在成本函数中加入开关频率项,在选择最优电压矢量的同时还降低了逆变器的整流频率与开关损耗;另外为了提高电机推力的效率以及减小推力与磁链波动,提出最大推力电流比与占空比优化控制技术,提高直线电机的动态控制性能。基于MATLAB/Simulink与dSPACE联合仿真,并搭建直线电机与主动悬架硬件测试平台,对所提出的控制方法进行验证,同时对主动悬架系统的动力学性能也进行了仿真与试验测试。试验结果表明:相较于传统的直接推力控制,所提出的控制策略使电机能够拥有更快的稳态速度、更小的电磁力与磁链波动以及更低的开关频率;各工况下,轮胎动载荷试验与仿真结果均方根值的相对误差分别为12.3%、4.47%、6.3%;悬架动行程试验与仿真结果均方根值的相对误差分别为10.3%、8.86%、10.6%;车身加速度试验与仿真结果均方根值的相对误差分别为6.23%、9.12%、7.2%。由计算结果可知,各评价指标的相对误差均在13%以内,验证了仿真结果的正确性,证明了模型预测推力控制对于提升电机与悬架动力学性能的有效性,能够实现对车辆悬架系统全局工况性能最优,协调控制悬架系统的动力学性能。 相似文献
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Static and Dynamic Performance of Permanent Magnet Suspension for Maglev Transport Vehicle 总被引:1,自引:0,他引:1
Hitoshi Tsunashima Masato Abe 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1998,29(2):83-111
The design and performance of a mechanical air gap controller for a maglev transport vehicle are described. The basic requirement for a functional design of the controller is derived first and its effectiveness is shown by experiments. After the construction of dynamic vehicle models dynamic characteristics of the maglev vehicle are introduced and the stability criteria for magnetic levitation are derived. The effect of a dead zone in the mechanical air gap controller and nonlinear characteristics of the magnets, which are expected to exert a large influence on vehicle levitation performance, are investigated by simulations. The simulation results show that a low control lever ratio causes sudden deterioration of the levitation performance if there exists a dead zone in the controller, and a suitable control lever ratio which is unaffected by the dead zone is proposed. Finally, field test results with an actual maglev transport vehicle are shown and the dynamic levitation performance of the vehicle is discussed. 相似文献
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盾构密封舱的土压平衡作为地表沉降控制的关键因素对盾构安全施工具有重要保障。为映射影响土压平衡掘进参数之间的非线性耦合关系,增强非线性控制模型的动态性能,提高土压平衡的控制精度,根据盾构施工中影响密封舱内土压平衡的掘进参数调控的难易程度,依托现场监测数据建立基于动态神经网络逆控制前馈作用下的螺旋输送机转速控制模型。对控制模型的性能与效果进行分析验证,结果表明: 动态神经网络输出的前馈螺旋输送机转速能够对推进速度、刀盘转矩的变化响应灵敏; 在给定掘进条件下与通过人工调节螺旋输送机转速控制土舱压力的方法相比,动态神经网络逆控制前馈作用下密封舱土压的最大波动误差由9.8%降为5.3%。 相似文献
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I. ech 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1994,23(1):133-148
A vehicle model incorporating front and rear wheel suspensions and seat suspension is presented. The suspension control includes algorithms to provide both dynamic and steady state (levelling) control. Vehicle response to (a) vertical inputs due to ground disturbances at the wheels and (b) longitudinal inputs due to the inertial forces during braking and accelerating, are investigated. It is shown that the static (self-levelling) control causes a slight deterioration in dynamic performance. The active ride control produces improvements of ride comfort under dynamic conditions compared to an equivalent passively suspended vehicle. In steady state the proposed control eliminates the error heave of the body caused by tilting of the vehicle with active suspension. 相似文献
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PSO algorithm-based parameter optimization for HEV powertrain and its control strategy 总被引:1,自引:0,他引:1
The coordination between the powertrain and control strategy has significant impacts on the operating performance of hybrid
electric vehicles (HEVs). A comprehensive methodology based on Particle Swarm Optimization (PSO) is presented in this paper
to achieve parameter optimization for both the powertrain and the control strategy, with the aim of reducing fuel consumption,
exhaust emissions, and manufacturing costs of the HEV. The original multi-objective optimization problem is converted into
a single-objective problem with a goal-attainment method, and the principal parameters of powertrain and control strategy
are set as the optimized variables by PSO, with the dynamic performance index of HEVs being defined as the constraint condition.
Computer simulations were carried out, which showed that the PSO scheme gives preferable results in comparison to the ADVISOR
method. Therefore, fuel consumption and exhaust emissions of HEVs can be effectively reduced without sacrificing dynamic performance
of HEVs. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):587-617
Modern software tools have enhanced modelling, analysis and simulation capabilities pertaining to control of dynamic systems. In this regard, in this paper a full vehicle model with flexible body is exposed by using MSC. ADAMS and MSC. NASTRAN. Indeed, one of the most significant vehicle dynamic controls is directional stability control. In this case, the vehicle dynamic control system (VDC) is used to improving the vehicle lateral and yaw motions in critical manoeuvres. In this paper, for design the VDC system, an optimal control strategy has been used for tracking the intended path with optimal energy. For better performance of VDC system, an anti-lock brake system (ABS) is designed as a lower layer of the control system for maintaining the tyre longitudinal slip in proper value. The performances of the controller on rigid and flexible models are illustrated, and the results show the differences between the control efforts for these models, which are related to the differences of dynamic behaviours of rigid and flexible vehicle dynamic models. 相似文献
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Bo Leng Lu Xiong Zhuoping Yu Tong Zou 《International Journal of Automotive Technology》2018,19(1):55-62
For a distributed drive electric vehicle (DDEV) which is equipped with redundant actuators, allocation control is a key technique. Three different allocation control algorithms are designated with fixed efficiency matrix, dynamic efficiency matrix, and direct yaw moment distribution, respectively. All these algorithms are applied in a vehicle stability control system with hierarchical control structure and evaluated from three aspects, namely, control precision, real-time characteristics, and control energy. Comparison results demonstrate that the algorithm with dynamic efficiency matrix has the best comprehensive performance, which is also validated in field tests based on a DDEV equipped with four motors. 相似文献
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