Research And System Design Of Dynamic Force Measurement Technology Based On WSN

With the development of aerospace technology, large deformation flexible bodies such as parachutes are more widely used. However, the measurement and analysis of the stress when the equipment is working are always a technical problem. Deformation of large deformation flexible bodies is a dynamic process at a high speed. In this process, the shape of the flexible body is changed dramatically, during which factors such as the shape and material strength are different from those in the static condition. The existing measurement methods cannot meet the large deformation characteristics and with these methods, only qualitative analyses can be conducted. The wireless sensor network(WSN) is a distributed sensor network, which can be perceived as a sensor in the external world. With the WSN as the signal transmission carrier, influence of the sensor layout on the measurement can be reduced. At the same time, the WSN signal transmission distance can reach several thousand meters, which can effectively handle the limited transmission distance.In this thesis, the measurement technique of large deformation flexible bodies represented by parachutes is studied. Firstly, this thesis analyzes the stress process, the stress scene and the force characteristic of the flexible body, designs the framework of the dynamic stress measuring system based on the WSN, analyzes the operation mechanism of the system, and studies key technologies such as data acquisition, and storage. Secondly, this thesis proposes a dynamic force measurement sensor model based on the WSN. With the improved Ω sensor and WSN technology, a dynamic force measurement sensor module is developed. Thirdly, based on CC2530 and Flash SPI, the mechanism for high-speed acquisition and signal acquisition is designed. Fourthly, various factors that may affect the measurement are analyzed in depth and the method of compensating for the error source of the measurement process is studied. The data compensation method is proposed, which can compensate for the error in the measurement process. Finally, the dynamic force measurement system based on the WSN is designed and implemented.In this thesis, experiments and analyses are conducted for typical large deformation flexible bodies. Field experiments show that the dynamic stress measurement system based on the WSN can effectively measure the stress on large deformation flexible bodies. Compared with other methods, the system proposed in this thesis is more accurate and can better resist the interference.