Research On Surface And Hole Precision Measurement Technology Of Connecting Plate Of Collector Bracket In Trough Solar Power

As a new technology in clean energy,solar thermal power generation has become a power generation mode strongly advocated by the domestic and international energy industry by virtue of its high grid-connected ratio,stable power generation performance and high power generation efficiency.Because the trough solar power station is the most utilized power generation mode,the domestic research team has carried out a lot of basic research,development and utilization.The concentrating performance of the trough solar power generation system is an important factor affecting its power generation performance and energy utilization rate.The concentrating performance depends directly on the surface characteristics of the concentrator and the relative position of the parabolic mirror and the heat collecting tube.The precision of surface and hole of connecting plate of collector bracket is the main reason for the decrease of the concentrating performance.In the meantime,ignoring the processing error of the heat collecting bracket for assembly will change the surface characteristics of the concentrator and reduce the concentrating performance of the concentrator.In view of the problems of low measurement efficiency and insufficient measurement accuracy of the existing heat collecting stent processing technology,this dissertation proposes the non-contact measurement technology based on eddy current effect and visual measurement to process the crucial structural features of the collector bracket.Meanwhile,corresponding design of the overall structure of the measurement system and formulation of processing quality evaluation standard system for the surface and hole of connecting plate of collector bracket was finished in this dissertation,completing the measurement mechanism proposed in this dissertation.The main research work of this dissertation is as follows:(1)This dissertation analyzes the principle of non-contact measurement technology,and establishes the mathematical model of eddy current effect and computer vision applied in this measurement technology;and then designs the overall structure of Collector Bracket Measurement System based on this principle;this dissertation also discusses the analysis of the synchronization relationship between the various actuators of the system so as to formulate a process of the measurement system.(2)The Collector Bracket Measurement System calibration obtained the positional relationship between the imaging system parameters,the imaging system and the extremity of the moving mechanism and the relative positions of the components in the system,and determined the static parameters of the system.(3)A method for measuring the processing quality of the collector bracket by non-contact measurement based on the eddy current effect is proposed.This dissertation determined the installation position of the eddy current sensor by analysis,and proposed the method of reconstructing the surface features by using the detected data,writing the corresponding program makes the test results more intuitive by describing the surface features of the machined surface from three aspects: the machine surface slope,the machine plane equation and the specified point coordinates;and then established a parameterized model of the Collector Bracket Measurement System reference coordinate system through the determined coordinate system change relationship matrix,in order to analyze the spatial positional relationship between them and judge the overall processing quality of the collector bracket installing surface;this dissertation designed corresponding comparative experiment,confirming the truth of the feasibility of a single face measurement method and data processing method,analyzing and summarizing the causes of the surface feature detection error in the measurement system.(4)A method for measuring the processing quality of the collector bracket by non-contact measurement based on the visual measurement is proposed.This dissertation put forward a visual measurement algorithm for the position deviation of two holes(standard calibration hole and actual machining hole)through a method for measuring single hole machining deviation based on visual measurement,and the visual measurement algorithm is simulated and verified by MATLAB software;and will judge the overall processing quality of the positioning hole of the collector bracket based on the machining deviation of the six rows of holes after calculating the machining deviation of the row of holes by using the single hole machining deviation.In this paper,the corresponding contrast experiments are also designed to verify the reliability of the visual measurement algorithm of a single hole,and to analyze and summarize the causes of the measurement method and the error of the measurement system.(5)This dissertation proposed a method for analyzing the influence of processing deviation of collector bracket on the intercept factor of concentrator after establishing a mathematical model of the surface characteristics of the concentrator and analyzing the factors affecting its surface characteristics,and formulated a processing quality evaluation standard system for the surface and hole of connecting plate of the collector bracket,which consummated the measurement mechanism proposed in this dissertation.