南宫NG28

◉    Service background

1、On January 29, 2019, the Ministry of Transport issued the Interim Safety Assessment Measures for The Management of Safety Assessment before The Initial Operation of Urban Rail Transit (TRANSPORTATION Regulation [2019] No. 1) (hereinafter referred to as the Safety Assessment Measures). The Safety Assessment Measures specify in detail the relevant contents of the management and implementation of safety assessment before the initial operation. After that, the general office of the Ministry of Transport issued on February 1, 2019 by the urban rail traffic safety assessment before initial operation specification, part 1: the subway and light rail "(assigned by luck [2019] no. 17) (hereinafter referred to as" technical specifications "), before initial operation in umt safety evaluation work of technical content. Both the Safety Assessment Measures and the Technical Specifications will be implemented from July 1, 2019.In the Technical Specification, it is explicitly required that before the initial operation of urban rail transit project, systematic linkage test of wheel-rail relationship and bow-network relationship should be conducted to test and evaluate whether the test indicators meet the standard requirements.

2、Electrified rail transit locomotives and vehicles rely on pantoons to obtain electric energy from the catwalk, realize the guidance and support of the train through the wheel-rail relationship, and obtain traction through the wheel-rail adhesion under the drive of the motor, and overcome the aerodynamic resistance and mechanical friction resistance to achieve space movement. Compared with high-speed trains, the running speed of urban rail transit vehicles is lower, and the fluid-solid coupling interaction between vehicles and external turbulence is not the main factor restricting the maximum running speed of vehicles and affecting the movement behavior of vehicles. Therefore, for urban rail transit vehicles, the three fundamental mechanical problems (wheel-rail relationship, bow-network relationship, fluid-solid coupling) in the bow-network relationship and wheel-rail relationship become the key elements of the dynamic performance research and development design of urban rail transit vehicles, and also the most important factors affecting the service performance of the vehicle in the process of engineering application.Because of this, wheel-rail relationship and bow-net relationship have become the focus of the initial operation safety evaluation of urban rail transit in China.

3、With the urban rail transit power supply way escalated, more and more metro lines to choose from the original DC1500V to AC27.5 kV power supply system, as the change of power supply system of electromagnetic interference effects, the original communication and signal control system, etc have been unable to meet their own requirements, electromagnetic interference, therefore, electromagnetic interference test has become the early operation of urban rail transit in China one of the focus on content of safety assessment.

4、As a means of mass public transport, subway has become an important part of traffic in large and medium-sized cities in the world and is one of the main measures to alleviate traffic congestion in big cities.Its characteristic is that traffic density is high, big traffic, environment is closed, the operation safety requirements is extremely high, therefore, grasp the dynamics of urban rail transit within two fundamental mechanics problems, analysis of the potential of metro operation accidents wheel/rail, bow net, communication, signal control factors, formulate the corresponding countermeasures of accident prevention and accident emergency rescue, to prevent accidents and reduce accident loss has very important significance.

◉    service content

◉    Our strengths

1、Our product line has a team of professional test technicians with rich experience in the industry, and we cooperate with well-known universities in the industry to provide customers with industry-university-research-test integrated services.

2、The product line of CTRC has a sound project management process, quality management procedures, test results and reports with high credibility.

3、Customer-centric, customer-oriented, to deliver security and trust for the purpose, to cost-effective, efficient services to serve customer needs.