For motorcycle consumers, it is of practical significance to correctly select and use helmet products that have passed the quality certification, reduce injuries to the head when traffic accidents happen, and protect the life safety of consumers. There are a variety of motorcycle helmets nationwide certification, familiar with European E-mark certification (ECE certification), AS certification, DOT certification, CSA certification, this paper introduces the requirements of motorcycle helmets enjoy prestigious SNELL certification in North America and worldwide technology.

First, the SNELL certification body S N E L L is called the S N E L L Memorial Foundation (E). It is a non-profit organization that is committed to research, education, testing and R & D of helmet safety standards in the United States. In 1956, a racing driver named William Pete Snell died in the head of a race. In order to commemorate him, his relatives, friends and some scientists and other racers in 1957 set up a named non-profit Memorial Foundation, dedicated to the study of human motion in the vehicle head hit the nature and helmet standard research, education, development and testing. Under their efforts, the SNELL foundation was established in 1957. The foundation has a board of directors to monitor the operation of the foundation. The members of the board are mainly composed of medical experts and scientists who are experts in the field of brain injury and safety. Since its founding in 1957, SNELL- has been a pioneer in helmet security in the United States, North America and even around the world.

Today, SNELL is well known throughout the United States and even around the world with helmet standards, supervision and upgrading. The SNELL helmet standard is very strict, which is more stringent than the 40CFR ppart1023 standard developed by the US Department of transportation (DOT), the American Academy of Standards Research (ANSI), the American Society of testing and materials (ASTM) and the Consumer Product Safety Commission (CPSC). In order to make full use of the results of technology and research, and to maximize the safety of consumers. The SNELL standard is replaced once every 5 years. SNELL testing laboratory located in California the capital of Sacramento, well-equipped. Snell Memorial Foundation of California can test laboratory helmet is the number of the United States through the Laboratory Accreditation Committee accredited laboratory IS017025 F, is the world's most advanced M helmet testing equipment and testing tasks most busy testing machine of SNELL each year to seal, third party members are public position for the helmet manufacturers, the state government and the government of the United States more than thousands of top test helmet.

Two, SNELL authentication procedure

Three, the SENLL certification of 1. sampling and send samples in helmet SNELL certification, testing samples selected and sent by the manufacturer. The manufacturer selects 5 or 7 top helmets that can represent the quality of the products produced (according to the M2010 standard, depending on the size of helmet head type in the authentication unit). In the samples, the manufacturer should attach with the sample Snell certification must be "Pre-Testing HelmetInformation Form", the form is included in the SNELL certification holder, product types and specifications (size), type of trademark, HPI type, shell and buffer layer material, the number of samples, for detection (authentication, setting, etc.), change the standard, sample detection based on the disposal of information. If not in the form of sending samples together with, will increase the additional communication ring | Festival, and even cause the detection cycle delay. 2. in October 10, 2007, SNELL issued the latest M2010 standard for motorcycle helmet testing. The certification test carried out according to the M2010 standard began in March 1, 2008, and the logo approved according to the M2010 standard began to purchase in July 1, 2009, and the helmet product certified according to the M2010 version standard began to be sold in October 1, 2009. From June 30th 2011, it will no longer carry out the certification test according to the M2005 version standard. From June 30, 2011, it will no longer issue the M2005 version of the certification mark. Since 2011 March 31st, it will not be able to produce motorcycle helmet products according to the technical requirements of the M2005 version.

The current transition period for the coexistence of M2005 and M2010 standards. The comparison and analysis of the SNELL M2005 motorcycle helmet certification standards and other helmet standards is shown in Table 1. Compared to the standard of the M2010 version and the M2005 version, there are mainly the following differences and changes. (1) the technical requirements for collision test of the M2010 version of the collision test are shown in Table 2. The change of the technical requirements of the new and old standards to the collision test is mainly reflected in the following aspects: * the quality of the head type M2005 and the previous standard require that in the collision test, the effective weight of the head type is 5.Okg regardless of the size of the head type. The M2010 standard requires that the quality of the head type is related to the size of the head type. The technical requirements for the head form in the M2005 version standard refer to the technical contents of the IS06220 draft, which is exactly the same as the B SI6658-1985 standard of the British Standard Research Institute. The requirements for the quality of the head type in the M2010 standard are in accordance with the requirements of the ECERn-05 regulation, which is now the European mandatory standard for motorcycle helmets. The quality specifications of the head type are added to the M2010 version standard. See the C head column in the above table. From A-J, the peak acceleration is 275G in the authentication test, which is exactly the same as the technical requirements of ECERn-05. But M and. For such a big head, the peak acceleration in the SNELL authentication test is not regulated by the ECER22-05 standard, but is the same as that of the previous SNELL standard. According to the M2005 standard, a small size helmet is certified according to the requirements of the M2010 version. It can be certified by wearing the light head. When it is tested, it may not pass. Similarly, according to the requirements of the M2010 version, the small size head is certified.