Research Of Input Shaping For Vibration Reduction Of Flexible Structure

LED automatic die-bonder is a crucial equipment which binds LED microchip onto lead frame in LED back-end production.The picking and placement module, which fulfills the main action of the machine, is the core of die-bonder. However, there is a huge problem with this module which will affects the whole performance of the machine if we don't pay enough attention to it. This problem will be described in detail on chapter 2. The structure and function is also introduced in this chapter. On chapter 3, an effective method, which is called input-shaping, will be discussed and be used to our machine. Some basic shapers, such as zero vibration(ZV), zero vibration and derivative(ZVD), extra insensitivity(EI) and shaper-linked are introduced in this chapter. Based on the data of experiment, we analyze the advantage and disadvantage among these shapers and choose a comfortable one for our flexible arm. The result of experiment is shown in this paper and we will find this algorithm plays a perfect role.Although the input-shaping algorithm reduces the vibration of flexible arm effectively, it can't ensure the controlled objects to achieve the planned position accurately, because of the open-loop control. This is a huge disadvantage of traditional input-shaping. In this paper, we try to solve this problem. By using a close-loop controller with the feedback value of controlled objects'position, the flexible arm will be able to move"smoothly and accurately".The software system is developed by using VC++ 6.0 on Windows XP. Main modules are parameter setting, shaper setting, data management and data displacement. And the calculating and displaying of data is accomplished by the MATLAB engine in the VC++ 6.0.