Research And Application Of Universal Control Platform In Durability Testing

With the development of society and quality of life improved, apart from the beauty and luxury of the products, people put forward higher requirements for the durability. Because of the fatigue, the products will be broken-down in service, it will result in not only the obsolescence of the products, but also more seriously endangering the safety of consumers. In order to detect the potential problems, the durability test is more and more important.Durability tests take a long time to run, thus it requires high reliability and durability of the equipment itself. Due to the type and structure of the measured object changes frequently, the test equipment needs to have high flexibility and versatility. The existing equipment has a strong pertinence, once the requirement and structure of the measured product has been changed, we need to update the original test equipment at the same time. In order to shorten the development cycle of test equipment and reduce testing costs, in this paper, we design a universal control platform, which can be customized script with the actual requirement, through self-designed digital input and output cards, analog input and output cards and universal motor control card, after the script analysis module integrated controlling, it can be applied to all types of durability test.The paper studies the characteristics and performance of the existing durability test system in detail. The test system is divided into the following three modules: signal acquisition module, motion control module, script analysis module. The main contents of this paper include:(1) Cascaded signal acquisition module: This module can acquire both digital and analog signal of industrial interfaces, for different test requirements can also be cascaded to expand.(2) Universal motion control module: This module can be used to test the durability of the cylinder, motor, servo motor control, The support of the servo motor makes control the precision much higher.(3) Custom scripts parsing modules: through self-designed script parser which makes the test equipment more flexible and universal. The module is based on the specific test requirements, using a script custom tool to generate test scripts, through test scripts parse to realize automated testing. Using lower computer to parser scripts, so that the control platform can run automatically from the upper computer, which improve the timeliness and reliability of the system. The entire system using the RS-422 industrial bus to communicate, differential signal transmission improves noise immunity of the system.Finally, the platform is applied to four doors and two covers of the car durability test systems, which achieve a servo motor and cylinder drive tests, after a long period of experimental verification, the system is stable and reliable and real-time data acquisition is accurate. Universal control platform makes developers to test the durability of the platform faster and more convenient and shortens the development cycle and reduces test costs, and also enhance the openness of the platform.