Introduction
Roller Coaster, one of the widely seen mechanical rides and thrill rides in the amusement parks, theme parks and carnivals, are famous as the “The King of Entertainment Machine”, which is regarded as the greater and more death-defying thrills. As for many people, the roller coaster are the main reason or the only one reason to go to an amusement park. Some people call it the “scream machine”, because riders on the roller coaster can not stop to scream all the way.
