The current research of wheel force transducer （WFT） mainly focuses on test signal processing and decoupling methods based on signal itself, while the WFT structure optimization research related to decreasing the ma...The current research of wheel force transducer （WFT） mainly focuses on test signal processing and decoupling methods based on signal itself, while the WFT structure optimization research related to decreasing the mass and increase the natural frequency and comprehen- sive sensitivity is not enough. In order to improve the WFT test accuracy, a structure optimization method based on natural frequency and comprehensive sensitivity indicators is put forward. The WPT with 8-beam elastic body is used for the finite element modeling （FEM）, in which the fol- lowing variations are taken into consideration： the con- nection type of elastic body with modified rim, the number of connection holes, and the respects of strain beam including the shape, the cross sectional area and the length, etc.. The test results shows that the natural frequency of the connecting block type is increased by 65.5% compared with the connecting seat type of elastic body ＆ modified rim, and the main channel sensitivity is improved as well. The results show that the connecting block type will achieve the best comprehensive performance when the number of connecting holes between the elastic body and the modified rim is 20. And the thinner and longer strain beam with smaller cross section area is preferable within the scope of elastic body mechanical strength. This research proposes a novel structure optimization method for WFT which contributes to improve the measurement performance of WFT.展开更多
In order to estimate the trafficability of off-road vehicles, the linear relationships between the pressure and the stiffness of the tire and the action of the vertical tire force with the viscoelasticity are analyzed...In order to estimate the trafficability of off-road vehicles, the linear relationships between the pressure and the stiffness of the tire and the action of the vertical tire force with the viscoelasticity are analyzed. The method to improve the precision of the model by the coefficients is presented. The constitutive equation of the three-parameter linear model and the stiffness matrix of four-node isoparametric elements are derived to construct the FEM （finite element method） tire model in plan stress. A demarcation and verification system is designed based on the six-dimensional wheel force transducer and the vertical tire force is measured under different velocities. The results show that the model and the method proposed are reasonable.展开更多
轮胎力传感器(Wheel force transducer,WFT)采用串联方式传递地面对轮胎的作用力,增加轮胎质量4～10 kg,此附加质量对WFT本身测量精度和整车稳定性会造成影响。选择8梁和4梁弹性体两种典型电阻应变WFT,对弹性体、未改制轮辋、弹性体+改...轮胎力传感器(Wheel force transducer,WFT)采用串联方式传递地面对轮胎的作用力,增加轮胎质量4～10 kg,此附加质量对WFT本身测量精度和整车稳定性会造成影响。选择8梁和4梁弹性体两种典型电阻应变WFT,对弹性体、未改制轮辋、弹性体+改制轮辋装配体进行模态对比分析。然后量化由轮胎旋转形成的离心力和由弹性体外环垂直运动惯性力形成的附加变形梁拉压变形。基于15自由度整车仿真模型进行90 km/h匀速、160°转向盘角阶跃输入对比试验,根据质心侧偏角和横摆角速度分析WFT附加质量对汽车稳定性的影响。结果表明,弹性体基频振动中变形梁的拉伸和弯曲变形,以及垂直运动惯性力形成的附加变形梁拉压变形是形成WFT系统测试误差的主要因素;WFT安装后会改变整车的稳定性,增加响应延时。展开更多
To improve the semi-empirical model, the slip sinkage effect is analyzed based on the real vehicle test. A dynamic testing system is used to gain the dynamic responses of wheel-soil interactions, The Gauss-Newton algo...To improve the semi-empirical model, the slip sinkage effect is analyzed based on the real vehicle test. A dynamic testing system is used to gain the dynamic responses of wheel-soil interactions, The Gauss-Newton algorithm is adopted to estimate the undetermined parameters involved in the slip sinkage models. Wong＇s original model is compared with three typical slip sinkage models on the prediction performance of a drawbar pull. The maximum error rate, root mean squared error and correlation coefficient are utilized to evaluate the performance. The results indicate that the slip sinkage models outperform Wong＇s model and greatly improve the prediction accuracy. Lyasko＇s model is confirmed as an outstanding one for its comprehensive performance. Hence, the existence of the slip sinkage effect is validated. Lyasko＇s model is selected as an optimal one for the practical evaluation of military vehicle trafficability.展开更多
车轮力传感器对汽车整车性能研究有着重要的作用,为了提高车轮力传感器数据的采集精度,开发了基于蓝牙无线技术的数据传输系统.以车轮力传感器(wheel force transducer)为基础,设计了包含采集模块、传输模块和蓝牙模块的数据传输系统....车轮力传感器对汽车整车性能研究有着重要的作用,为了提高车轮力传感器数据的采集精度,开发了基于蓝牙无线技术的数据传输系统.以车轮力传感器(wheel force transducer)为基础,设计了包含采集模块、传输模块和蓝牙模块的数据传输系统.采集模块以C8051F021为核心芯片,负责采集车轮力传感器输出的数据、码盘数据和检测电池电量;传输模块以C8051F040为核心芯片,负责转换命令格式和向上位机传送数据,供其后续处理和显示;蓝牙模块以CSR BC04为核心芯片,负责采集模块和传输模块之间的通信,使其通过蓝牙方式实现通讯.实验测试了系统的传输率和稳定性,并与现有的nRF2401无线传输进行对比测试,结果表明,蓝牙无线传输系统有着更快的传输率和更好的稳定性.展开更多
介绍了车轮力传感器(WFT,wheel force transducer)的称重式实车标定装置及其数据采集系统的原理及结构,并且详细介绍了采集系统的硬件和软件设计。该系统以混合信号系统级单片机C8051F005为核心,实现了对车轮力传感器数据和称重平台数...介绍了车轮力传感器(WFT,wheel force transducer)的称重式实车标定装置及其数据采集系统的原理及结构,并且详细介绍了采集系统的硬件和软件设计。该系统以混合信号系统级单片机C8051F005为核心,实现了对车轮力传感器数据和称重平台数据的同步采集,并通过RS232将数据传送到上位机(笔记本计算机)。在该标定装置上成功地进行了车轮力传感器的实车标定试验。展开更多
为实现同步采集道路载荷谱数据并保存,设计开发了一套车轮力传感器(wheel force transducer,WFT)数据采集系统.文中详细介绍了该系统的软硬件构成,硬件采用PC104主板,软件采用了Linux下的多线程技术,实现了既可以通过自身按键进行控制...为实现同步采集道路载荷谱数据并保存,设计开发了一套车轮力传感器(wheel force transducer,WFT)数据采集系统.文中详细介绍了该系统的软硬件构成,硬件采用PC104主板,软件采用了Linux下的多线程技术,实现了既可以通过自身按键进行控制也可以通过以太网远程控制的WFT采集多串口数据转以太网服务器的设计.测试与试验表明:系统可以稳定可靠地采集各通道传感器数据,能够满足道路载荷谱数据采集的性能要求,作为自主研制的车路测试仪器具有重要的应用价值.展开更多
基金Supported by Anhui Provincal Natural Science Foundation of China (Grant No. 1608085ME109)National Natural Science Foundation of China (Grant Nos. 51675005, 51105001)State Key Laboratory of Automotive Safety and Energy, Tsinghua University, China (Grant No. KF14022)
文摘The current research of wheel force transducer （WFT） mainly focuses on test signal processing and decoupling methods based on signal itself, while the WFT structure optimization research related to decreasing the mass and increase the natural frequency and comprehen- sive sensitivity is not enough. In order to improve the WFT test accuracy, a structure optimization method based on natural frequency and comprehensive sensitivity indicators is put forward. The WPT with 8-beam elastic body is used for the finite element modeling （FEM）, in which the fol- lowing variations are taken into consideration： the con- nection type of elastic body with modified rim, the number of connection holes, and the respects of strain beam including the shape, the cross sectional area and the length, etc.. The test results shows that the natural frequency of the connecting block type is increased by 65.5% compared with the connecting seat type of elastic body ＆ modified rim, and the main channel sensitivity is improved as well. The results show that the connecting block type will achieve the best comprehensive performance when the number of connecting holes between the elastic body and the modified rim is 20. And the thinner and longer strain beam with smaller cross section area is preferable within the scope of elastic body mechanical strength. This research proposes a novel structure optimization method for WFT which contributes to improve the measurement performance of WFT.
文摘In order to estimate the trafficability of off-road vehicles, the linear relationships between the pressure and the stiffness of the tire and the action of the vertical tire force with the viscoelasticity are analyzed. The method to improve the precision of the model by the coefficients is presented. The constitutive equation of the three-parameter linear model and the stiffness matrix of four-node isoparametric elements are derived to construct the FEM （finite element method） tire model in plan stress. A demarcation and verification system is designed based on the six-dimensional wheel force transducer and the vertical tire force is measured under different velocities. The results show that the model and the method proposed are reasonable.
文摘轮胎力传感器(Wheel force transducer,WFT)采用串联方式传递地面对轮胎的作用力,增加轮胎质量4～10 kg,此附加质量对WFT本身测量精度和整车稳定性会造成影响。选择8梁和4梁弹性体两种典型电阻应变WFT,对弹性体、未改制轮辋、弹性体+改制轮辋装配体进行模态对比分析。然后量化由轮胎旋转形成的离心力和由弹性体外环垂直运动惯性力形成的附加变形梁拉压变形。基于15自由度整车仿真模型进行90 km/h匀速、160°转向盘角阶跃输入对比试验,根据质心侧偏角和横摆角速度分析WFT附加质量对汽车稳定性的影响。结果表明,弹性体基频振动中变形梁的拉伸和弯曲变形,以及垂直运动惯性力形成的附加变形梁拉压变形是形成WFT系统测试误差的主要因素;WFT安装后会改变整车的稳定性,增加响应延时。
基金The National Natural Science Foundation of China(No.51305078)the Science and Technology Plan of Suzhou City(No.SYG201303)
文摘To improve the semi-empirical model, the slip sinkage effect is analyzed based on the real vehicle test. A dynamic testing system is used to gain the dynamic responses of wheel-soil interactions, The Gauss-Newton algorithm is adopted to estimate the undetermined parameters involved in the slip sinkage models. Wong＇s original model is compared with three typical slip sinkage models on the prediction performance of a drawbar pull. The maximum error rate, root mean squared error and correlation coefficient are utilized to evaluate the performance. The results indicate that the slip sinkage models outperform Wong＇s model and greatly improve the prediction accuracy. Lyasko＇s model is confirmed as an outstanding one for its comprehensive performance. Hence, the existence of the slip sinkage effect is validated. Lyasko＇s model is selected as an optimal one for the practical evaluation of military vehicle trafficability.
文摘车轮力传感器对汽车整车性能研究有着重要的作用,为了提高车轮力传感器数据的采集精度,开发了基于蓝牙无线技术的数据传输系统.以车轮力传感器(wheel force transducer)为基础,设计了包含采集模块、传输模块和蓝牙模块的数据传输系统.采集模块以C8051F021为核心芯片,负责采集车轮力传感器输出的数据、码盘数据和检测电池电量;传输模块以C8051F040为核心芯片,负责转换命令格式和向上位机传送数据,供其后续处理和显示;蓝牙模块以CSR BC04为核心芯片,负责采集模块和传输模块之间的通信,使其通过蓝牙方式实现通讯.实验测试了系统的传输率和稳定性,并与现有的nRF2401无线传输进行对比测试,结果表明,蓝牙无线传输系统有着更快的传输率和更好的稳定性.
文摘介绍了车轮力传感器(WFT,wheel force transducer)的称重式实车标定装置及其数据采集系统的原理及结构,并且详细介绍了采集系统的硬件和软件设计。该系统以混合信号系统级单片机C8051F005为核心,实现了对车轮力传感器数据和称重平台数据的同步采集,并通过RS232将数据传送到上位机(笔记本计算机)。在该标定装置上成功地进行了车轮力传感器的实车标定试验。
文摘为实现同步采集道路载荷谱数据并保存,设计开发了一套车轮力传感器(wheel force transducer,WFT)数据采集系统.文中详细介绍了该系统的软硬件构成,硬件采用PC104主板,软件采用了Linux下的多线程技术,实现了既可以通过自身按键进行控制也可以通过以太网远程控制的WFT采集多串口数据转以太网服务器的设计.测试与试验表明:系统可以稳定可靠地采集各通道传感器数据,能够满足道路载荷谱数据采集的性能要求,作为自主研制的车路测试仪器具有重要的应用价值.
