车体静强度试验需要通过液压缸对车体进行作用力加载。针对传统车体静强度试验台手动调节液压缸作用力操作复杂、精度低以及试验台信息化程度低、监管困难等问题,基于LabVIEW设计了车体静强度试验台测控系统。基于LabVIEW开发了该测控...车体静强度试验需要通过液压缸对车体进行作用力加载。针对传统车体静强度试验台手动调节液压缸作用力操作复杂、精度低以及试验台信息化程度低、监管困难等问题,基于LabVIEW设计了车体静强度试验台测控系统。基于LabVIEW开发了该测控系统上位机软件,在控制算法上,针对液压缸加载特性和系统安全性、鲁棒性的要求,对PID(proportion integration differentiation,比例积分微分)算法进行改进并基于自适应算法对PID参数进行调整;选择S7-200 SMART PLC(programmable logic controller,可编程逻辑控制器)作为下位机来对液压泵站进行控制,上、下位机间采用OPC(object linking and embedding for process control,过程控制中的对象链接和嵌入)技术进行通信;基于以太网开发了试验台信息化系统,并设计了信息化流程。试验结果证明:该测控系统实现了对液压缸作用力的快速、准确控制,具有较强的安全性和鲁棒性;达到了对液压泵站远程操作、数据实时采集及对试验台信息化管理的目标。该测控系统可推广至需对液压缸作用力进行自动控制和对系统信息化要求较高的实际应用中。展开更多
Many studies have been conducted by analyzing crash data that included road profile, site conditions, vehicle configurations and weights, driver behavior, etc.. However, limited studies have been conducted evaluating ...Many studies have been conducted by analyzing crash data that included road profile, site conditions, vehicle configurations and weights, driver behavior, etc.. However, limited studies have been conducted evaluating the impact of these factors on crashes and/or rollover through simulations. This is mainly due to lack of availability of verified full vehicle flexible-body models. The verification process is costly as it requires instrumentation of a heavy vehicle, scanning of road surfaces, and collection of data by running the vehicle over different road conditions, performing various maneuvering, etc. This paper presents the reverse engineering process of a class-8 truck and validation of a full flexible-body simulation model of a Wabash 53-foot trailer against the strain data recoded from proving ground testing of an instrumented truck. Simulation results show that, with the exception of the noise from the strain gage data from instrumented test run at 30 mph, there is a good agreement in periodicity and relative amplitude with the ADAMS model. A comparison of strain data from the flex-body model and the instrumented truck shows that the modeling and verification approach presented in this paper can be confidently used to validate the full flexible-body models developed for specific analyses.展开更多
文摘车体静强度试验需要通过液压缸对车体进行作用力加载。针对传统车体静强度试验台手动调节液压缸作用力操作复杂、精度低以及试验台信息化程度低、监管困难等问题,基于LabVIEW设计了车体静强度试验台测控系统。基于LabVIEW开发了该测控系统上位机软件,在控制算法上,针对液压缸加载特性和系统安全性、鲁棒性的要求,对PID(proportion integration differentiation,比例积分微分)算法进行改进并基于自适应算法对PID参数进行调整;选择S7-200 SMART PLC(programmable logic controller,可编程逻辑控制器)作为下位机来对液压泵站进行控制,上、下位机间采用OPC(object linking and embedding for process control,过程控制中的对象链接和嵌入)技术进行通信;基于以太网开发了试验台信息化系统,并设计了信息化流程。试验结果证明:该测控系统实现了对液压缸作用力的快速、准确控制,具有较强的安全性和鲁棒性;达到了对液压泵站远程操作、数据实时采集及对试验台信息化管理的目标。该测控系统可推广至需对液压缸作用力进行自动控制和对系统信息化要求较高的实际应用中。
文摘Many studies have been conducted by analyzing crash data that included road profile, site conditions, vehicle configurations and weights, driver behavior, etc.. However, limited studies have been conducted evaluating the impact of these factors on crashes and/or rollover through simulations. This is mainly due to lack of availability of verified full vehicle flexible-body models. The verification process is costly as it requires instrumentation of a heavy vehicle, scanning of road surfaces, and collection of data by running the vehicle over different road conditions, performing various maneuvering, etc. This paper presents the reverse engineering process of a class-8 truck and validation of a full flexible-body simulation model of a Wabash 53-foot trailer against the strain data recoded from proving ground testing of an instrumented truck. Simulation results show that, with the exception of the noise from the strain gage data from instrumented test run at 30 mph, there is a good agreement in periodicity and relative amplitude with the ADAMS model. A comparison of strain data from the flex-body model and the instrumented truck shows that the modeling and verification approach presented in this paper can be confidently used to validate the full flexible-body models developed for specific analyses.
