双横臂悬架导向机构杆长配置对车轮外倾角的影响

基于双横臂悬架结构及运动学分析,推导出机构几何参数与车轮外倾角的数学表达式。利用MATLAB软件进行仿真计算,获得了车轮外倾角变化曲线形态与杆长配置的相互关系和规律,得到较为理想的双横臂悬架布置方案。从而为设计具有合理外倾角变化的双横臂悬架导向机构提供借鉴。     

基于ADAMS的某型越野车悬架仿真与优化研究

以ADAMS/Car车辆动力学仿真软件为基础,根据双横臂独立悬架关键硬点坐标,建立某型越野车双横臂式独立前悬架动力学模型,并对前悬架系统进行车轮跳动仿真。在ADAMS/Insight中对前悬架定位参数进行灵敏度分析。根据前轮定位参数的变化规律和灵敏度分析结果,选取悬架的8个关键硬点坐标为设计变量,对4个悬架定位参数进行优化设计。仿真结果表明,优化后的双横臂独立悬架的运动学特性得到改善。     

基于ADAMS/VIEW的双横臂式独立悬架转向梯形机构断开点位置的仿真分析

通过建立某轻型卡车双横臂式独立悬架的数学模型和仿真模型,利用ADAMS软件仿真汽车运动过程中不同断开点位置车轮前束角的变化规律,并用空间解析几何关系式验证了仿真结果的正确性与可靠性.与其它方法相比,本方法更具有直观性,计算结果更加符合实际情况,为双横臂独立悬架转向梯形机构设计提供了较为精确的实用方法.     

双横臂独立悬架导向机构硬点匹配设计

介绍了根据整车参数,在满足悬架性能的基础上,匹配设计悬架导向机构硬点的方法.以国内一款正在研发的电动小车为例,计算了与小车相匹配的双横臂独立悬架导向机构硬点位置坐标,在ADAMS/CAR下建立了小车悬架模型,仿真结果表明初次匹配的悬架导向机构基本合理;并通过ADAMS/INSIGHT,对悬架定位参数的影响因子进行了分析,重新匹配计算了硬点坐标,仿真验证重新匹配的机构更能满足设计要求.研究结果为悬架设计的研究提供了参考.     

ADAMS/Car与Insight在双横臂悬架优化设计中的应用

运用ADAMS/Car初步建立了某特种车的双横臂式前悬架,并通过双轮平行跳动仿真分析了轮跳对前轮定位参数的影响,选出需要优化的参数。通过ADAMS/Insight对悬架硬点进行灵敏度分析,找到影响性能较大的硬点坐标。对于灵敏度较大的设计参数建立车轮定位参数在轮跳过程中最大变化量的二阶响应面近似数学模型,利用MATLAB编程拟合出近似模型并进行优化求解与可靠性分析。修改优化后的悬架硬点坐标再次进行仿真试验比较优化前后的试验结果,验证优化的合理性。     

全地形消防车双横臂悬架仿真分析与优化

以悬架设计理论为基础,设计了全地形消防车双横臂悬架。通过SolidWorks建立全地形消防车悬架模型,以建立的双横臂悬架三维模型和设计参数,利用ADAMS/Car建立全地形消防车双横臂悬架动力学虚拟样机模型。之后对双横臂悬架虚拟样机模型进行双轮平行跳动仿真试验,分析各定位参数变化后得出主销内倾角变化范围不合理。之后联合ADAMS/Insight对悬架硬点进行灵敏度分析及优化。结果表明优化后的主销内倾角达到了合理变化范围,其他定位参数也均有了一定的改善,有效的提升全地形消防车悬架性能。     

全方位线控四轮转向电动汽车设计

提出了一种用于外转子式轮毂电机的双横臂悬架导向机构和转向机构，可实现四轮驱动电动汽车绕任一点进行旋转，以及沿任一方向进行平移。研究了当电机失灵时的故障排除技术，即可通过电磁离合器的开关组合，驱动一台转向电机可使四个车轮全部复位，且仍可保持转向能力。用Euler角描述了悬架导向机构的姿态，推导出与车轮定位参数相关的悬架导向机构姿态角公式，对各控制点坐标进行参数化，在ADAMS软件下建立了参数化模型，并对悬架导向机构进行了优化设计。     

FSAE赛车前轮定位参数的优化研究

针对大学生方程式(FSAE)赛车前轮定位参数的优化设计问题,基于ADAMS/Car模块建立FSAE赛车双横臂独立悬架的仿真模型,对前轮定位参数进行仿真分析。利用ADAMS/Insight模块进行优化设计,确定设计参变量和设计目标,对所选定的设计目标进行影响因素分析;根据优化结果修改前悬架仿真模型,再次进行前轮定位参数的仿真分析。结果表明:赛车车轮上下跳动时,优化后的前轮定位参数能够在合理的范围内变化,满足赛车悬架设计要求,赛车悬架的主要性能得到明显提高。     

利用ADAMS/car对双横臂悬架的动态仿真与分析

利用ADAMS/car软件对样车建立双横臂悬架仿真模型,并对后倾拖距、磨胎半径、侧倾中心、四个定位角和车轮跳动量进行动态仿真。通过对仿真结果与样车悬架相应参数进行比较,验证了仿真模型的动特性与样车悬架动特性的一致性。其结论对汽车悬架的设计与开发具有一定的参考价值。     

基于遗传算法的悬架硬点运动学的优化

为了准确分析悬架的运动学特性,利用Matlab建立了双横臂悬架运动学仿真数学模型,利用CAT-IA/DMU验证了数学模型的准确性,通过该模型分析了轮胎跳动对车轮定位参数的影响,并通过遗传算法对悬架的硬点进行优化,结果表明:优化后的悬架运动特性得到了改善。     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

基于多目标非支配解提取法的电力系统无功优化

针对传统的电力系统多目标粒子群优化算法采用权重系数法将多目标转化为单目标,从而忽视了各目标函数间的竞争关系这一问题,提出将非支配解提取法运用到电力系统多目标无功优化中,并设定了一套提取规则,以电力系统中的有功网损、电压偏差和电压稳定裕度为目标,使目标在充分竞争的情况下得出Pareto最优解,利用IEEE-14节点系统对多目标非支配解提取法的电力系统无功优化进行了仿真测试。研究结果表明,该算法一次运行可以得出多组非支配解,既有偏向单个目标的解也有兼顾所有目标的解,克服了权重系数法的盲目性和单一性,可使电力决策者根据实际问题选择最优解,具有较好的灵活性与多样性。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.