The Study For Non-inserting Type Hydrualic Pipe Pressurement And Flow Measurement Technology

The ordinary steel pipe for the hydraulic system is considered as the mainsubject. Fluid pressure and flow rate measurement in the pipeline based on strain mouthed have been studied.Outlines the background of this issue, the importance, the purpose and practical significance. The history, status, and the problem of the pressure and flow and the technology for fault diagnosis to the hydraulic system are reviewed. In order to meet the need of hydraulic equipment fault detection and diagnosis, the dissertation proposed a new measurement method using pipe distortion to measure the pressure and flow of the fluid in the pipe based on non-inserting technology.In the aspect of theories, the pipeline dynamic model and recent developments have been summed up systematically. According to the transmission line theory in microwave technology, the time-domain representation of the pipeline dynamic model has been taken. The non-linear factors of the pipeline dynamic model have been studied, pointing out because this equation is derived from microwave technology, and compared with the hydraulic system of electrical microwave transmission, there are too many non-linear factors in the hydraulic system and the non-linear factors should be based on the actual situation of the equation in setting the parameters to be adjusted. The non-linear factors were analysied.It was be found that the impedance modulus the largest non-linear factors, and must be eliminated.The theoretical research to the elasticity modulus changes has been made. It was been proposed that the elasticity modulus changes randomly, and must use the real-time measurement results of operations at the same time. And in simulation and engineering design, modulus of elasticity must be considered in a certain range of changes, between the minimum and maximum change. We can not determine the value or use a function of determining the amount in setting modulus calculation and designing work.In the aspect of system implementation, for the deformation rate of hydraulic pipe is small, so there is suspicion to the feasibility corresponding measuring deformation of the pipeline by strain method. So the feasibility is proved in the static and dynamic characteristics and theoretical basis for the next fixture is provided.In the aspect of commercialization, a clamp has been designed for measurement. First, the various structure forms have been brought forward, and then the experiment was carried out. According to the experiment result, the clamp parameter continually has been readjusted. At last, an appropriate clamp has been designed.Tests were analyzed. These tests proved the dynamic pressure in hydraulic pipe can be measured by strain method, the guidance for the location of the clamps in the pipe have been given. It shows that using the dynamic pressure to calculate the flow was feasible.