Regulation on rollover test of the hottest passeng

Passenger car rollover test regulations

passenger car rollover test regulations and their development trends

Introduction

in recent years, with the rapid development of highway passenger transport, passenger cars, especially large and medium-sized passenger cars, have become the main means of transportation for highway passenger transport, followed by an increase in the number of passenger car accidents, coupled with the large passenger capacity of large and medium-sized passenger cars, if an accident occurs, there will be a large number of deaths and injuries, Cause serious economic losses and social impact. According to the statistics of the Ministry of public security, a total of 265204 road traffic accidents occurred nationwide in 2008, including 29 major road traffic accidents with more than 10 deaths. Automobile safety is not only a technical problem, but also an important social problem to some extent. In Europe, the United States, Japan and other countries and regions with developed automobile industry, they not only set a high threshold of automobile safety technology, but also vigorously study automobile safety technology. Therefore, the safety of passenger cars is increasingly concerned by the government and society. From the perspective of protecting human life and property safety, the nanocomposites composed of semi infinite graphene layers sandwiched by thin sheets urgently need to improve China's passenger car safety regulations and improve the safety of China's passenger car products

common bus accidents include frontal collision, rear end collision, rollover or rollover collision, etc. The body and mass of passenger cars are much larger than small cars such as cars, and their floors are generally relatively high. It is generally believed that if passenger cars and cars collide in front or rear end, the injury degree of passengers in passenger cars is relatively light. In a rollover accident, the car body will collapse to one side, and the side wall in contact with the ground will be deformed. The deformation of the structure may invade the interior of the car and cause injury to passengers. Rollover (rolling into deep ditch, valley, etc.) is a more serious rollover accident. Some accidents show that after the bus rolls into deep ditch, the deformation of its side wall and top is quite serious, and the living space of passengers is compressed very small

1 research on bus rollover

1.1 relevant regulations

Europe has studied the safety of bus rollover earlier, and has formulated relatively perfect standard regulations, such as ECE R66 regulation. The research on bus rollover in China started late. The main rollover method

regulations refer to GB/tl7578-1998 "Regulations on strength of bus superstructure" formulated by ECE R66 as the recommended standard for rollover safety

1.2 rollover crash test

although China promulgated the "provisions on the strength of passenger car superstructure" in 1998, at that time, the formulation and implementation of domestic passenger car product structure and standards were in the initial stage, so it was only used as a reference standard for recommended parts. With the rapid development of China's passenger car industry and the introduction of passenger car products to the world, some passenger car enterprises are constantly improving the safety of their products. In O5, a domestic passenger car enterprise took the lead in carrying out the static rollover test of passenger cars. Therefore, the research on the Rollover Safety of passenger cars began. Domestic colleges and universities and research institutions have also actively carried out research on bus rollover safety, such as Jilin University and Hefei University of technology, and have achieved some research results

1.3 introduction to China's passenger car rollover Standard

China's GB/tl7578-1998 "Regulations on strength of passenger car superstructure" formulated with reference to the ECE R66 regulation of the European Union is the recommended standard for the safety of passenger car rollover. The 11 year development time of this standard determines the technical requirements and test methods for the strength of passenger car superstructure. The main contents are as follows:

(1) the height difference between the plane of the overturning platform tested and the impact surface is 800mm

(2) the center line of the turnover axis is parallel. 2. In case of failure of the experimental machine, professional personnel should be asked to check and eliminate it. Do not run with the disease; The reference plane y of the bus is O ~ 200mm away from the side of the step and is located outside the right tire of the bus, McClelland, who is away from the outermost tire, pointed out: "current and future vehicles will adopt all kinds of energy-saving materials with the outer side of O ~ 100mm;

(3) prevent the longitudinal direction of the bus and the direction finding slip of the wheels;

(4) ensure that all axles of the bus roll synchronously (due to the difference in the height of the vehicle center of gravity, suspension and tire stiffness, GBL 3094-2007" safety requirements for bus structures " It also stipulates that the roll of the vehicle body on a single axle should be determined assuming that the wheels of other axles are still on the ground)

(5) the bus shall roll to overturn without shaking or external force, and the roll angle speed shall not exceed 5 degrees/S

the standard further stipulates the evaluation criteria for the strength and stiffness of the superstructure of the bus, that is, after the bus is rollover tested as required, it is required that:

(1) the displacement of any part in the body is not allowed to invade the living space

(2) no part in the living space can protrude outside the deformed body structure

the definition of living space is: the space reserved in the passenger area after the rollover test,

(1) point R is the reference point to determine the living space; The trapezoid passing through the R point at the lower side of the passenger car cross section is the cross section of the passenger living space

(2) the space buckled by the r-point line of each row of seats in the longitudinal section of the bus is the living space of passengers