Xuan Dong

A Method for Constructing Reliability Target Load Spectrum of Taxi Customers

AbstractA method for constructing load spectrum based on typical working condition data acquisition and velocity distribution is presented to improve the authenticity and effectiveness of customer ...

A car steering rod fatigue analysis based on user conditions

Fatigue - one of the major mechanical failure, has caught more and more attention in vehicle reliability study. Fatigue test results of vehicles are usually discrete, which is caused mostly by the users conditions. It is considered the users real purpose in the test, which can help the users to develop or design a suitable testing program, improve the test run quality and shorten the product development cycle from concept to bulk production. This article describes the ways and methods of investigating the users conditions, deals with the strain gauge data which is obtained from the test of the right steering link by using the professional signal processing software according to the reference of the survey results, and assesses the fatigue life of the steering link according to the rain-flow counting method and local strain-life fatigue analysis effecting on the strain spectrum finally.

Research on Improving TCP Performance over Wireless Network Communication in Long-Distance Operating Vehicles

Transmission Control Protocol (TCP) performs poorly in high bit error rate wireless channel because of the assumption that packets loss is always a sign of congestion. An improved scheme for optimizing TCP wireless transmission rate of the vehicle terminals based on General Packet Radio Service (GPRS) is proposed, including fast determination of the root cause in data packet loss, network congestion or wireless code errors and the corresponding retransmission plan in the case of high code error rate in the link layer. By conducting experiments with Network Simulator (NS2) and numerical simulation, we conclude that with the application of this optimized scheme, the data transmission rate between the Control Center and the vehicle terminals can be effectively increased.

Design and Realization of Remote Monitoring Platform Software for Transportation Vehicle with Hazardous Material

To monitor operating state of vehicles in real-time during transportation of hazardous material, remote monitoring platform software for transportation vehicle of hazardous material was developed by using the development tools of Visual Basic and SQL Database. With the technologies of GPRS, GPS and GIS, operating state information of vehicles collected with vehicle-mounted monitoring terminal was sent to the monitoring platform running on server. By comparing the two data transmission protocols in GPRS network, TCP/IP was finally selected as the vehicle communication protocol. Therefore the bi-directional communication between remote monitoring platform and vehicle-mounted monitoring terminal was implemented. Field tests verified that the remote monitoring platform software can monitor vehicle location and real-time transport status. Furthermore, the results showed that this new platform is a practical application in engineering. 1. PREFACE With the economic development in China, the hazardous chemical is used more and more widely, and transportation of dangerous chemical is becoming more and busier. In China, traffic accidents of dangerous chemical transportation happened frequently in recent years. For example, on March 29, 2005 a trough tanker carrying liquid chlorine turned over caused by a tire blast and led to leakage of toxic substance in Huai-an, Jiangsu province. 29 people died in the accident. It is even worse that the runaway driver failed to report the accident in time and the pollution has dispersed, which brought great loss to our country and society. In the past, transportation companies can only contact their vehicle drivers with telephone. When an accident occured, the relevant department can’t deal with it timely. Therefore, it is very important to develop a system that can be used to control and monitor the vehicle of hazardous material transportation in real-time. Currently, monitoring of hazardous material basically focuses on the location of vehicle. Information of localization was provided only when dangerous incident occurred. Such system can not fundamentally solve the harm caused by dangerous material, and it can not meet the modern demands for monitoring hazardous material