The Research On The Door Closing Effort Calculate Based On Door Assembly Deviation Analysis

With the rapid development of automotive industry, higher request for the vehicle comfort is raised by consumers nowdays. In order to win the consumers'favor, automobile factory is seeking for a way which is not only able to satisfy the request of the consumers for vehicle comfort, but also up to the standard of the country. Based on the market investigate of JDPOWER, the force of opening or closing the door is always one of the most quality that consumers is cared about. The force of closing the door which refers to the minimum force to close the door is very important for the brand image of modern automotive. The comfort of closing a car door is always considered as a juding criterion for the manufacturing level of automobile factories, and the estimation of the force needed to close the car door is the weakness of the automobile factory in domestic. If the force needed to close the car door can be estimated correctly before design and manufacture, it would do a great favor for improve the structure of the car body and the comfort of the car.At first, it is started from the analysis of the force when closing the car door, the six subsystem factors-the door gravity, door hinge, water shield, door lock, air resistance, guard which can affect the force to close the car door is analyzed one by one, including the structure and the functional mechanism of the six subsystems. Then the dynamic model is established according to the force the are supporting when closing the car door, and the energy consumption function equation is constructed based on the relation of every parts.Then, considering the assembly deviation of the car door which has a great affect on the force of closing the car door, monte carlo method which is used to analysis the assembling error of the car door is introduced in this article, through the research on the process of assembling the car door and the resources of assembling error, the VisVSA-assemble and analysis software which is based on monte carlo algorithm is utilized to get the dimensional tolerance data of every subsystem in car door into the software,and the tolerance data is in accordance to GD&T drawing. After the model of car door system and the parts which is around the door is established, the gap deviation of car door with the parts is got through simulation, and the gap deviation will be compared to the gap deviation which is got from experiment of real, from the result the message can be get that the simulation result is close to the result of the experiment, the deviation is limited in ten percentage.At last, the statistic data of assembling error in y and z direction of door lock is get from the simulation using monte carlo method, then the data and the data of car subsystem is imported into the model of car door closing energy consumption, the result of force needed to close the car door is estimated from the simulation. The experiment will be did concerning the force of closing the car door, and the experiment will did in two different situations with one take the assembly deviation into consideration while the other is not. Comparing the result of the simulation and the real experiment, the conclusion is get that the simulation result of the model which takes assembly deviation into consideration get a closer result with the real experiment, the deviation error is limited in five percentage, and the algorithm which is proposed in this article is proved effective. The assembly deviation is combined with the the model of car door closing energy consumption to estimate the force when closing the car door is the innovation point of this article.