Method and system for detecting three-dimensional pressure distribution on the joint surface of a demagnetization switch

Abstract

The present invention provides a method and system for detecting the three-dimensional pressure distribution of the lap joint surface of a demagnetization switch, comprising acquiring scanned data of the lap joint surface of the demagnetization switch, establishing a switch lap joint surface model, and performing theoretical pressure analysis based on the model construction to form pressure data of the demagnetization switch lap joint surface model; acquiring contact pressure data of the lap joint surface of the demagnetization switch, and performing pressure fitting analysis based on the acquisition position in combination with the switch lap joint surface model to form lap joint surface pressure acquisition distribution data; and performing pressure deviation analysis in combination with the lap joint surface pressure data of the demagnetization switch lap joint surface model and the lap joint surface pressure acquisition distribution data to form lap joint surface pressure detection and analysis result data. The method compares and analyzes the established demagnetization switch lap joint surface model data with the pressure data collected by the sensor to accurately analyze and determine the lap joint pressure condition of the lap joint surface.

Description

Technical Field

[0001] The present invention relates to the technical field of demagnetization switches, and in particular to a method and system for detecting three-dimensional pressure distribution on a fracture overlap surface of a demagnetization switch. Background Art

[0002] A demagnetization switch is an electrical device used in generators and motors. It's primarily designed to quickly cut off the excitation current when the equipment shuts down or malfunctions, preventing damage from the persistent magnetic field. During normal operation, the demagnetization switch is closed. To ensure the demagnetization switch can provide the excitation current, the contact surface of the fracture must be stable.

[0003] Currently, the contact stability of the fracture joint surface can be measured by setting a thin film pressure sensor at the joint surface. How to reasonably utilize and analyze the measurement results to accurately detect the contact condition at the joint surface is a problem worth considering.

[0004] Therefore, it is an urgent problem to design a three-dimensional pressure distribution detection method for the lap joint surface of the demagnetization switch fracture, and to accurately analyze and judge the lap joint pressure situation by comparing the established demagnetization switch lap joint surface model data with the pressure data collected by the sensor. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a three-dimensional pressure distribution detection method and system for the overlapping surface of the demagnetization switch fracture. By collecting model data of the overlapping surface of the demagnetization switch fracture to establish an overlapping surface model, the working characteristics and structural characteristics of the overlapping surface can be used to analyze the contact reliability, and overlapping pressure distribution data corresponding to the overlapping surface model can be formed. After the sensor data of the contact pressure is collected, on the one hand, combined with the overlapping surface model, a reasonable analysis and determination of the pressure distribution of the overlapping surface in the actual state can be achieved. On the other hand, it can also be compared and analyzed with the overlapping pressure distribution data of the model to determine whether the pressure distributed on the overlapping surface meets the requirements of the working reliability of the demagnetization switch, thereby realizing accurate and reasonable detection of the overlapping pressure of the overlapping surface, ensuring effective real-time monitoring of the overlapping surface pressure distribution, and avoiding damage to the equipment caused by unreasonable overlapping surface pressure.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A method for detecting three-dimensional pressure distribution on the overlapping surface of a demagnetization switch fracture includes:

[0008] Obtain scanning data of the demagnetization switch fracture joint surface, establish a switch joint surface model, and perform theoretical pressure analysis based on the model construction to form the demagnetization switch fracture joint surface model pressure data;

[0009] Collect contact pressure data of the demagnetization switch fracture overlap surface, and combine the switch overlap surface model to perform pressure fitting analysis based on the collection position to form overlap surface pressure collection distribution data;

[0010] Combined with the demagnetization switch fracture joint surface model pressure data and the joint surface pressure collection distribution data, pressure deviation analysis is performed to form the joint surface pressure detection and analysis result data.

[0011] The method establishes a lap joint model by collecting model data of the lap joint surface of the demagnetization switch fracture, and then can use the working characteristics and structural characteristics of the lap joint surface to analyze the contact reliability, and form lap pressure distribution data corresponding to the lap joint surface model. After the data of the contact pressure sensor is collected, on the one hand, combined with the lap joint surface model, it is possible to reasonably analyze and determine the pressure distribution of the lap joint surface under the actual state, and on the other hand, it can also be compared and analyzed with the lap pressure distribution data of the model to determine whether the pressure distributed on the lap joint surface meets the requirements of the working reliability of the demagnetization switch, thereby realizing accurate and reasonable detection of the lap joint pressure of the lap joint surface, ensuring effective real-time monitoring of the lap joint pressure distribution, and avoiding damage to the equipment caused by unreasonable lap joint pressure.

[0012] The above-mentioned acquisition of the demagnetization switch fracture joint surface scanning data, establishment of the switch joint surface model, and the theoretical pressure analysis based on the model construction to form the demagnetization switch fracture joint surface model pressure data include:

[0013] Based on the scanned data collected from the demagnetization switch fracture joint surface, the scanned dimension information and the joint surface material information are extracted for modeling and processing to form a switch joint surface model;

[0014] Conduct pressure analysis on the switch joint surface model based on structural stress and contact reliability to determine the allowable joint pressure range;

[0015] Based on the scanned data collected from the demagnetization switch fracture overlap surface, the thermal damage information of the overlap surface is extracted. The pressure variation characteristics are analyzed in combination with the allowable overlap pressure range to form the pressure data of the demagnetization switch fracture overlap surface model.

[0016] The main purpose of modeling the lap joint surface of the demagnetization switch is to obtain characteristic range data of the contact pressure variation allowed under the condition that the lap joint surface can work reliably and stably, so as to use the characteristic range data as a reference for collecting real-time contact pressure data for comparative analysis, and to efficiently and accurately determine whether the real-time contact pressure affects the reliable and stable operation of the switch. It should be noted here that the established model is not a simple structural model based on structural data, but rather model data that gives the structure material characteristic information, that is, model data that can truly simulate the actual lap joint state. On this basis, the model is subjected to pressure distribution analysis based on the structural stress condition and lap joint reliability, and then the pressure distribution characteristic data allowed by the lap joint model is determined. Therefore, the scanned acquisition data includes the three-dimensional structural data formed by the scan and the material information obtained by means other than spectral analysis.

[0017] The above-mentioned pressure analysis of the switch joint surface model based on structural stress and contact reliability determines the allowable joint pressure range, including:

[0018] Determine the reliability limit index, and use the reliability limit index as the analysis target to conduct contact analysis on the switch joint surface model with continuous change of uniform pressure on the entire joint surface, and determine the reliability joint surface uniform pressure value ;

[0019] Taking the allowable stress of the lap joint structural material as the analysis target, the contact analysis of the switch lap joint model with the uniform pressure continuously changing on the entire lap joint surface is carried out to determine the uniform allowable pressure value of the lap joint surface. ;

[0020] According to the reliability of the uniform pressure value of the lap joint Uniform allowable pressure value of the faying surface , forming the allowable overlap pressure range A, where A=[ , ],and < .

[0021] In the present invention, the characteristic information to be extracted from the pressure conditions on the lap joint includes the maximum value and the minimum allowable value of the contact surface pressure. The maximum value that can be achieved is determined by taking the maximum force generated by the contact before the material undergoes irreversible changes as the analysis target. This force analysis for the model only requires providing a continuously changing and increasing contact surface pressure value to determine the value, with the material allowable stress as the result of the determination. As for the minimum allowable value, it can be understood that the lower the contact pressure on the lap joint, the greater the probability of poor contact. The target for the reliability of the lap joint operation can be determined based on actual conditions. For example, the reliability determination indicator can be the length of time after the lap joint pressure drops to a certain value, during which stable contact is maintained to ensure the flow of the excitation current. The reliability determination indicator can also be the loss of the excitation current value after the lap joint pressure drops to a certain value. The allowable lap pressure range is determined by limiting the range in both directions of the lap joint pressure value. It should be noted that the pressure on the faying surface of the model was idealized in the analysis of the maximum value achieved and the minimum value allowed. That is, the pressure on the entire faying surface was the same. This helps in model analysis and avoids the situation where the local pressure is too high, resulting in an inaccurate measurement standard for the obtained results.

[0022] The above data is collected by scanning the lap joint surface of the demagnetization switch, extracting the thermal damage information of the lap joint surface, and analyzing the pressure change characteristics in combination with the allowable lap pressure range to form the pressure data of the demagnetization switch lap joint surface model, including:

[0023] Determine the minimum thermal damage distance based on the thermal damage information of the lap joint ;

[0024] According to the minimum thermal damage distance and the allowable overlap pressure range A to determine the maximum pressure change gradient ,in, ;

[0025] Combined with the maximum pressure gradient And the allowable overlap pressure range A, form the demagnetization switch fracture overlap surface model pressure data.

[0026] In the present invention, it is understood that under ideal conditions, the entire overlapping surface is subjected to equal force. However, in reality, there may be situations where the pressure is higher or lower locally. This pressure difference may also cause overheating or arcing at a local location, thereby causing thermal damage within a certain range of the location. Therefore, the pressure gradient also needs to be analyzed. It can be understood that the greater the pressure change in a smaller area, the greater the probability of thermal damage in the corresponding area. Therefore, the characteristic information of the pressure change gradient is mainly determined based on the rate of change of the maximum pressure difference within the allowable pressure range within the minimum distance range. Here, the minimum value of the historically smallest thermal damage area is used as the distance measure of the pressure change gradient to obtain the maximum pressure change gradient.

[0027] The above-mentioned contact pressure data of the demagnetization switch fracture overlap surface is collected, and combined with the switch overlap surface model, a pressure fitting analysis based on the collection position is performed to form the overlap surface pressure collection distribution data, including:

[0028] Based on the switch joint model, pressure transmission analysis is performed within the allowable stress range of the material to determine the maximum pressure loss gradient;

[0029] According to the contact pressure data, the positions of different collected contact pressure values in the switch overlap surface model are determined and calibrated as the collection point positions;

[0030] According to the maximum pressure loss gradient and the corresponding collected contact pressure value at the collection point position, the collection pressure distribution analysis of the switch overlap surface model is performed to form the overlap surface pressure collection distribution data.

[0031] In the present invention, after obtaining the allowable lap pressure range of the lap joint and the limit value of the pressure change gradient, it can be used as a standard to compare and analyze the lap joint pressure data collected in real time to determine the rationality of the current pressure. Of course, to achieve this comparison result, the collected lap joint pressure data also needs to be processed. After all, the lap joint pressure data collected by the sensor is discrete, while the pressure distribution on the lap joint surface is continuous. Therefore, the collected discrete data needs to be fitted to form continuous data. This fitting method mainly uses the collected lap joint pressure value to perform a pressure change continuity analysis under the maximum loss gradient range. The pressure change continuity analysis mentioned here refers to fitting based on discrete lap joint pressure data. It is necessary to ensure that the pressure value determined by fitting at the position where the lap joint pressure is not detected is continuous, so as to be closer to the real-time situation.

[0032] Based on the switch joint model, the pressure transmission analysis is performed within the allowable stress range of the material to determine the maximum pressure loss gradient, including:

[0033] The uniform pressure value of the lap joint surface within the allowable lap joint pressure range A is the force applied value of the model, M spaced force application points are selected on the lap joint surface, and all force application points are evenly distributed on the lap joint surface;

[0034] Determine the angular interval value, take each force application point as the center of the circle, and determine different pressure diffusion directions that are spaced apart by the angular interval value on the entire circumference;

[0035] Apply the uniform pressure value of the reliability lap joint to a force application point each time , and obtain the pressure change gradient in all pressure diffusion directions corresponding to the force application point;

[0036] Determine the average pressure change gradient of the corresponding position point based on all pressure change gradients corresponding to the force applied position point;

[0037] The average pressure change gradient of the largest position among all force-applied positions is extracted and calibrated as the maximum pressure loss gradient.

[0038] In the present invention, the acquisition of the maximum pressure loss gradient is mainly to determine the characteristics of the lap joint material in pressure transmission, so that when using discrete pressure acquisition data to fit the pressure distribution on the entire lap joint, the pressure value at the uncollected position can be determined, and the determined pressure value can establish a continuously changing gradient relationship with the pressure value at the acquisition point. To obtain the maximum loss gradient, the same pressure value is input to each position point on the model, and then the gradient value of the pressure change in the direction of the entire circumferential line is determined. The average value of these gradient values is then obtained as the gradient of the pressure transmission after the force is applied at the corresponding position. Finally, the maximum average pressure change gradient is used as the maximum pressure damage gradient value allowed for the entire model.

[0039] Based on the maximum pressure loss gradient and the corresponding contact pressure value at the acquisition point, the switch joint surface model is analyzed for acquisition pressure distribution to form joint surface pressure acquisition distribution data, including:

[0040] Taking the maximum pressure loss gradient as the limiting value of pressure diffusion, the pressure fitting of the area between adjacent collection points is performed based on the corresponding collection contact pressure values at different collection points, and ensuring that the pressure value on the line connecting any two points on the overlap surface has a continuous variation relationship within the limiting range of the maximum pressure loss gradient;

[0041] Obtain pressure data on the entire faying surface to form faying surface pressure collection distribution data.

[0042] In the present invention, within the maximum damage gradient range, discrete pressure values are used as a standard to perform pressure fitting for the region of collected pressure values. The fitting must ensure that the resulting pressure data for the entire overlapped surface is stable along the line connecting the pressure values at any two locations. That is, the pressure gradient along the line is fixed to a certain value and does not exceed the maximum loss gradient. When performing pressure fitting for the region between adjacent collection points, pressure values can be determined for each of the two collection points at different circumferential distances from the collection point location, starting with the two collection points, using the maximum loss gradient as a reference. This results in two pressure values for each location within the region, each representing a gradient change based on the two collection points. A determination is then made as to whether two identical pressure values exist at the same location. If so, no fitting adjustment is required. If not, all locations with the smallest difference between the two pressure values are identified. The smaller pressure value is then adjusted based on this point, replacing the smaller pressure value with the larger pressure value. The loss gradient value, which uniformly changes pressure values, is then determined based on the pressure values of the collection locations corresponding to the smaller pressure values, ultimately resulting in a smooth regional pressure fitting distribution. Adjusting the smaller pressure value prevents the loss gradient value obtained after adjustment from exceeding the maximum loss gradient.

[0043] The above-mentioned pressure deviation analysis is performed by combining the demagnetization switch fracture joint surface model pressure data and the joint surface pressure collection distribution data to form the joint surface pressure detection and analysis result data, including:

[0044] Based on the pressure data of the demagnetization switch fracture joint model, the pressure distribution data of the joint surface is compared and analyzed based on the pressure change gradient to determine the impact range of the pressure gradient deviation;

[0045] According to the pressure data of the demagnetization switch fracture overlap surface model, the pressure range of the overlap surface pressure collection distribution data is compared and analyzed to form the pressure value deviation influence range data.

[0046] In the present invention, once the distribution data is acquired, it can be compared and analyzed with the pressure data from the faying surface model. This comparative analysis takes into account two aspects: one is the situation where local pressure changes are too large, which can easily cause local thermal damage and therefore requires analysis and confirmation; the other is that each pressure value on the faying surface is within the range defined by the pressure data from the faying surface model. Only when both aspects are compared and analyzed can the detection and processing of the three-dimensional pressure distribution of the faying surface be achieved.

[0047] Based on the pressure data of the demagnetization switch fracture joint model, the joint pressure distribution data is compared and analyzed based on the pressure change gradient to determine the pressure gradient deviation influence range data, including:

[0048] According to the pressure distribution data collected on the faying surface, the pressure change value is extracted to determine the pressure change rate distribution data on the entire faying surface;

[0049] According to the pressure change rate distribution data, compare the maximum pressure change gradient , determine that the pressure change rate exceeds the maximum pressure change gradient The location area and determine the maximum gradient change area distance of the location area , n means that the determined pressure change rate exceeds the maximum pressure change gradient The numbers of different location areas;

[0050] According to the minimum thermal damage distance , and for different maximum gradient change area distances Determine the following impact areas:

[0051] like > , then determine the distance of the maximum gradient change area The midpoint of the line segment, with the midpoint as the center, with the minimum thermal damage distance is the diameter, and the corresponding pressure gradient deviation influence range is determined;

[0052] like ≤ , then the distance of the maximum gradient change area The midpoint of the line segment is the center of the circle, and the distance from the maximum gradient change area is is the diameter, and the corresponding pressure gradient deviation influence range is determined;

[0053] All different pressure gradient deviation influence range areas are collected to form pressure gradient deviation influence range data.

[0054] Based on the pressure data of the demagnetization switch fracture joint surface model, the pressure range of the joint surface pressure collection distribution data is compared and analyzed to form the pressure value deviation influence range data, including:

[0055] According to the pressure distribution data of the lap joint surface, compared with the allowable lap joint pressure range A, the location area where the pressure value does not belong to the allowable lap joint pressure range A is determined, and the distance of the maximum pressure value change area in the location area is determined. ;

[0056] According to the minimum thermal damage distance , and the distance between the different maximum pressure value changes Determine the following impact areas:

[0057] like > , then determine the distance of the maximum pressure value change area The midpoint of the line segment, with the midpoint as the center, with the minimum thermal damage distance For the diameter, determine the corresponding pressure value deviation from the affected range area;

[0058] like ≤ , then the distance of the area with the maximum pressure value change The midpoint of the line segment is the center of the circle, and the distance from the maximum pressure value change area For the diameter, determine the corresponding pressure value deviation from the affected range area;

[0059] All different pressure value deviation influence range areas are collected to form pressure value deviation influence range data.

[0060] In the present invention, the comparative analysis of the pressure values is to make a comparative judgment on the allowable overlap pressure range based on the overlap surface pressure collection distribution data, and determine the location area where the pressure value does not fall within the allowable range. Similarly, if the pressure value does not fall within the allowable range, thermal damage will occur, and the range with the least thermal damage is the range defined by the minimum thermal damage distance. Therefore, the possible damage area range where the pressure value deviates is determined by judging whether the area size reaches the area size defined by the minimum thermal damage distance.

[0061] A system using the above-mentioned method for detecting three-dimensional pressure distribution on the fracture overlap surface of a demagnetization switch, the system comprising a model analysis unit, a pressure fitting unit, and a detection comparison unit;

[0062] The model analysis unit is used to obtain the scanned data of the demagnetization switch fracture joint surface, establish the switch joint surface model, and perform theoretical pressure analysis based on the model construction to form the demagnetization switch fracture joint surface model pressure data;

[0063] The pressure fitting unit is used to collect contact pressure data of the demagnetization switch fracture joint surface, and combines the switch joint surface model to perform pressure fitting analysis based on the collection position to form joint surface pressure collection distribution data;

[0064] The detection and comparison unit receives data from the model analysis unit and the pressure fitting unit, and is used to combine the demagnetization switch fracture lap joint model pressure data and the lap joint pressure collection distribution data to perform pressure deviation analysis and form lap joint pressure detection and analysis result data.

[0065] The present invention mentions a three-dimensional pressure distribution detection method for the overlapping surface of the demagnetization switch fracture, which establishes an overlapping surface model by collecting model data of the overlapping surface of the demagnetization switch fracture, and then can use the working characteristics and structural characteristics of the overlapping surface to analyze the contact reliability, and form overlapping pressure distribution data corresponding to the overlapping surface model. After the sensor data of the contact pressure is collected, on the one hand, combined with the overlapping surface model, it can realize a reasonable analysis and determination of the pressure distribution of the overlapping surface in the actual state, and on the other hand, it can also be compared and analyzed with the overlapping pressure distribution data of the model to determine whether the pressure distributed on the overlapping surface meets the requirements of the working reliability of the demagnetization switch, thereby realizing accurate and reasonable detection of the overlapping pressure of the overlapping surface, ensuring effective real-time monitoring of the overlapping surface pressure distribution, and avoiding damage to the equipment caused by unreasonable overlapping surface pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0067] Figure 1 A diagram showing the steps of a method for detecting three-dimensional pressure distribution on the overlapping surface of a demagnetization switch fracture provided by an embodiment of the present invention;

[0068] Figure 2 A schematic structural diagram of a three-dimensional pressure distribution detection system for a demagnetization switch fracture overlap surface based on a thin film pressure sensor provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0069] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0070] Example 1:

[0071] A method for detecting three-dimensional pressure distribution on the overlapping surface of a demagnetization switch fracture includes:

[0072] Obtain scanning data of the demagnetization switch fracture joint surface, establish a switch joint surface model, and perform theoretical pressure analysis based on the model construction to form the demagnetization switch fracture joint surface model pressure data;

[0073] Collect contact pressure data of the demagnetization switch fracture overlap surface, and combine the switch overlap surface model to perform pressure fitting analysis based on the collection position to form overlap surface pressure collection distribution data;

[0074] Combined with the demagnetization switch fracture joint surface model pressure data and the joint surface pressure collection distribution data, pressure deviation analysis is performed to form the joint surface pressure detection and analysis result data.

[0075] The method establishes a lap joint model by collecting model data of the lap joint surface of the demagnetization switch fracture, and then can use the working characteristics and structural characteristics of the lap joint surface to analyze the contact reliability, and form lap pressure distribution data corresponding to the lap joint surface model. After the data of the contact pressure sensor is collected, on the one hand, combined with the lap joint surface model, it is possible to reasonably analyze and determine the pressure distribution of the lap joint surface under the actual state, and on the other hand, it can also be compared and analyzed with the lap pressure distribution data of the model to determine whether the pressure distributed on the lap joint surface meets the requirements of the working reliability of the demagnetization switch, thereby realizing accurate and reasonable detection of the lap joint pressure of the lap joint surface, ensuring effective real-time monitoring of the lap joint pressure distribution, and avoiding damage to the equipment caused by unreasonable lap joint pressure.

[0076] The above-mentioned acquisition of the demagnetization switch fracture joint surface scanning data, establishment of the switch joint surface model, and the theoretical pressure analysis based on the model construction to form the demagnetization switch fracture joint surface model pressure data include:

[0077] Based on the scanned data collected from the demagnetization switch fracture joint surface, the scanned dimension information and the joint surface material information are extracted for modeling and processing to form a switch joint surface model;

[0078] Conduct pressure analysis on the switch joint surface model based on structural stress and contact reliability to determine the allowable joint pressure range;

[0079] Based on the scanned data collected from the demagnetization switch fracture overlap surface, the thermal damage information of the overlap surface is extracted. The pressure variation characteristics are analyzed in combination with the allowable overlap pressure range to form the pressure data of the demagnetization switch fracture overlap surface model.

[0080] The main purpose of modeling the lap joint surface of the demagnetization switch is to obtain characteristic range data of the contact pressure variation allowed under the condition that the lap joint surface can work reliably and stably, so as to use the characteristic range data as a reference for collecting real-time contact pressure data for comparative analysis, and to efficiently and accurately determine whether the real-time contact pressure affects the reliable and stable operation of the switch. It should be noted here that the established model is not a simple structural model based on structural data, but rather model data that gives the structure material characteristic information, that is, model data that can truly simulate the actual lap joint state. On this basis, the model is subjected to pressure distribution analysis based on the structural stress condition and lap joint reliability, and then the pressure distribution characteristic data allowed by the lap joint model is determined. Therefore, the scanned acquisition data includes the three-dimensional structural data formed by the scan and the material information obtained by means other than spectral analysis.

[0081] The above-mentioned pressure analysis of the switch joint surface model based on structural stress and contact reliability determines the allowable joint pressure range, including:

[0082] Determine the reliability limit index, and use the reliability limit index as the analysis target to conduct contact analysis on the switch joint surface model with continuous change of uniform pressure on the entire joint surface, and determine the reliability joint surface uniform pressure value ;

[0083] Taking the allowable stress of the lap joint structural material as the analysis target, the contact analysis of the switch lap joint model with the uniform pressure continuously changing on the entire lap joint surface is carried out to determine the uniform allowable pressure value of the lap joint surface. ;

[0084] According to the reliability of the uniform pressure value of the lap joint Uniform allowable pressure value of the faying surface , forming the allowable overlap pressure range A, where A=[ , ],and < .

[0085] In the present invention, the characteristic information to be extracted from the pressure conditions on the lap joint includes the maximum value and the minimum allowable value of the contact surface pressure. The maximum value that can be achieved is determined by taking the maximum force generated by the contact before the material undergoes irreversible changes as the analysis target. This force analysis for the model only requires providing a continuously changing and increasing contact surface pressure value to determine the value, with the material allowable stress as the result of the determination. As for the minimum allowable value, it can be understood that the lower the contact pressure on the lap joint, the greater the probability of poor contact. The target for the reliability of the lap joint operation can be determined based on actual conditions. For example, the reliability determination indicator can be the length of time after the lap joint pressure drops to a certain value, during which stable contact is maintained to ensure the flow of the excitation current. The reliability determination indicator can also be the loss of the excitation current value after the lap joint pressure drops to a certain value. The allowable lap pressure range is determined by limiting the range in both directions of the lap joint pressure value. It should be noted that the pressure on the faying surface of the model was idealized in the analysis of the maximum value achieved and the minimum value allowed. That is, the pressure on the entire faying surface was the same. This helps in model analysis and avoids the situation where the local pressure is too high, resulting in an inaccurate measurement standard for the obtained results.

[0086] The above data is collected by scanning the lap joint surface of the demagnetization switch, extracting the thermal damage information of the lap joint surface, and analyzing the pressure change characteristics in combination with the allowable lap pressure range to form the pressure data of the demagnetization switch lap joint surface model, including:

[0087] Determine the minimum thermal damage distance based on the thermal damage information of the lap joint ;

[0088] According to the minimum thermal damage distance and the allowable overlap pressure range A to determine the maximum pressure change gradient ,in, ;

[0089] Combined with the maximum pressure gradient And the allowable overlap pressure range A, form the demagnetization switch fracture overlap surface model pressure data.

[0090] In the present invention, it is understood that under ideal conditions, the entire overlapping surface is subjected to equal force. However, in reality, there may be situations where the pressure is higher or lower locally. This pressure difference may also cause overheating or arcing at a local location, thereby causing thermal damage within a certain range of the location. Therefore, the pressure gradient also needs to be analyzed. It can be understood that the greater the pressure change in a smaller area, the greater the probability of thermal damage in the corresponding area. Therefore, the characteristic information of the pressure change gradient is mainly determined based on the rate of change of the maximum pressure difference within the allowable pressure range within the minimum distance range. Here, the minimum value of the historically smallest thermal damage area is used as the distance measure of the pressure change gradient to obtain the maximum pressure change gradient.

[0091] The above-mentioned contact pressure data of the demagnetization switch fracture overlap surface is collected, and combined with the switch overlap surface model, a pressure fitting analysis based on the collection position is performed to form the overlap surface pressure collection distribution data, including:

[0092] Based on the switch joint model, pressure transmission analysis is performed within the allowable stress range of the material to determine the maximum pressure loss gradient;

[0093] According to the contact pressure data, the positions of different collected contact pressure values in the switch overlap surface model are determined and calibrated as the collection point positions;

[0094] According to the maximum pressure loss gradient and the corresponding collected contact pressure value at the collection point position, the collection pressure distribution analysis of the switch overlap surface model is performed to form the overlap surface pressure collection distribution data.

[0095] In the present invention, after obtaining the allowable lap pressure range of the lap joint and the limit value of the pressure change gradient, it can be used as a standard to compare and analyze the lap joint pressure data collected in real time to determine the rationality of the current pressure. Of course, to achieve this comparison result, the collected lap joint pressure data also needs to be processed. After all, the lap joint pressure data collected by the sensor is discrete, while the pressure distribution on the lap joint surface is continuous. Therefore, the collected discrete data needs to be fitted to form continuous data. This fitting method mainly uses the collected lap joint pressure value to perform a pressure change continuity analysis under the maximum loss gradient range. The pressure change continuity analysis mentioned here refers to fitting based on discrete lap joint pressure data. It is necessary to ensure that the pressure value determined by fitting at the position where the lap joint pressure is not detected is continuous, so as to be closer to the real-time situation.

[0096] Based on the switch joint model, the pressure transmission analysis is performed within the allowable stress range of the material to determine the maximum pressure loss gradient, including:

[0097] The uniform pressure value of the lap joint surface within the allowable lap joint pressure range A is the force applied value of the model, M spaced force application points are selected on the lap joint surface, and all force application points are evenly distributed on the lap joint surface;

[0098] Determine the angular interval value, take each force application point as the center of the circle, and determine different pressure diffusion directions that are spaced apart by the angular interval value on the entire circumference;

[0099] Apply the uniform pressure value of the reliability lap joint to a force application point each time , and obtain the pressure change gradient in all pressure diffusion directions corresponding to the force application point;

[0100] Determine the average pressure change gradient of the corresponding position point based on all pressure change gradients corresponding to the force applied position point;

[0101] The average pressure change gradient of the largest position among all force-applied positions is extracted and calibrated as the maximum pressure loss gradient.

[0102] In the present invention, the acquisition of the maximum pressure loss gradient is mainly to determine the characteristics of the lap joint material in pressure transmission, so that when using discrete pressure acquisition data to fit the pressure distribution on the entire lap joint, the pressure value at the uncollected position can be determined, and the determined pressure value can establish a continuously changing gradient relationship with the pressure value at the acquisition point. To obtain the maximum loss gradient, the same pressure value is input to each position point on the model, and then the gradient value of the pressure change in the direction of the entire circumferential line is determined. The average value of these gradient values is then obtained as the gradient of the pressure transmission after the force is applied at the corresponding position. Finally, the maximum average pressure change gradient is used as the maximum pressure damage gradient value allowed for the entire model.

[0103] Based on the maximum pressure loss gradient and the corresponding contact pressure value at the acquisition point, the switch joint surface model is analyzed for acquisition pressure distribution to form joint surface pressure acquisition distribution data, including:

[0104] Taking the maximum pressure loss gradient as the limiting value of pressure diffusion, the pressure fitting of the area between adjacent collection points is performed based on the corresponding collection contact pressure values at different collection points, and ensuring that the pressure value on the line connecting any two points on the overlap surface has a continuous variation relationship within the limiting range of the maximum pressure loss gradient;

[0105] Obtain pressure data on the entire faying surface to form faying surface pressure collection distribution data.

[0106] In the present invention, within the maximum damage gradient range, discrete pressure values are used as a standard to perform pressure fitting for the region of collected pressure values. The fitting must ensure that the resulting pressure data for the entire overlapped surface is stable along the line connecting the pressure values at any two locations. That is, the pressure gradient along the line is fixed to a certain value and does not exceed the maximum loss gradient. When performing pressure fitting for the region between adjacent collection points, pressure values can be determined for each of the two collection points at different circumferential distances from the collection point location, starting with the two collection points, using the maximum loss gradient as a reference. This results in two pressure values for each location within the region, each representing a gradient change based on the two collection points. A determination is then made as to whether two identical pressure values exist at the same location. If so, no fitting adjustment is required. If not, all locations with the smallest difference between the two pressure values are identified. The smaller pressure value is then adjusted based on this point, replacing the smaller pressure value with the larger pressure value. The loss gradient value, which uniformly changes pressure values, is then determined based on the pressure values of the collection locations corresponding to the smaller pressure values, ultimately resulting in a smooth regional pressure fitting distribution. Adjusting the smaller pressure value prevents the loss gradient value obtained after adjustment from exceeding the maximum loss gradient.

[0107] The above-mentioned pressure deviation analysis is performed by combining the demagnetization switch fracture joint surface model pressure data and the joint surface pressure collection distribution data to form the joint surface pressure detection and analysis result data, including:

[0108] Based on the pressure data of the demagnetization switch fracture joint model, the pressure distribution data of the joint surface is compared and analyzed based on the pressure change gradient to determine the impact range of the pressure gradient deviation;

[0109] According to the pressure data of the demagnetization switch fracture overlap surface model, the pressure range of the overlap surface pressure collection distribution data is compared and analyzed to form the pressure value deviation influence range data.

[0110] In the present invention, once the distribution data is acquired, it can be compared and analyzed with the pressure data from the faying surface model. This comparative analysis takes into account two aspects: one is the situation where local pressure changes are too large, which can easily cause local thermal damage and therefore requires analysis and confirmation; the other is that each pressure value on the faying surface is within the range defined by the pressure data from the faying surface model. Only when both aspects are compared and analyzed can the detection and processing of the three-dimensional pressure distribution of the faying surface be achieved.

[0111] Based on the pressure data of the demagnetization switch fracture joint model, the joint pressure distribution data is compared and analyzed based on the pressure change gradient to determine the pressure gradient deviation influence range data, including:

[0112] According to the pressure distribution data collected on the faying surface, the pressure change value is extracted to determine the pressure change rate distribution data on the entire faying surface;

[0113] According to the pressure change rate distribution data, compare the maximum pressure change gradient , determine that the pressure change rate exceeds the maximum pressure change gradient The location area and determine the maximum gradient change area distance of the location area , n means that the determined pressure change rate exceeds the maximum pressure change gradient The numbers of different location areas;

[0114] According to the minimum thermal damage distance , and for different maximum gradient change area distances Determine the following impact areas:

[0115] like > , then determine the distance of the maximum gradient change area The midpoint of the line segment, with the midpoint as the center, with the minimum thermal damage distance is the diameter, and the corresponding pressure gradient deviation influence range is determined;

[0116] like ≤ , then the distance of the maximum gradient change area The midpoint of the line segment is the center of the circle, and the distance from the maximum gradient change area is is the diameter, and the corresponding pressure gradient deviation influence range is determined;

[0117] All different pressure gradient deviation influence range areas are collected to form pressure gradient deviation influence range data.

[0118] Based on the pressure data of the demagnetization switch fracture joint surface model, the pressure range of the joint surface pressure collection distribution data is compared and analyzed to form the pressure value deviation influence range data, including:

[0119] According to the pressure distribution data of the lap joint surface, compared with the allowable lap joint pressure range A, the location area where the pressure value does not belong to the allowable lap joint pressure range A is determined, and the distance of the maximum pressure value change area in the location area is determined. ;

[0120] According to the minimum thermal damage distance , and the distance between the different maximum pressure value changes Determine the following impact areas:

[0121] like > , then determine the distance of the maximum pressure value change area The midpoint of the line segment, with the midpoint as the center, with the minimum thermal damage distance For the diameter, determine the corresponding pressure value deviation from the affected range area;

[0122] like ≤ , then the distance of the area with the maximum pressure value change The midpoint of the line segment is the center of the circle, and the distance from the maximum pressure value change area For the diameter, determine the corresponding pressure value deviation from the affected range area;

[0123] All different pressure value deviation influence range areas are collected to form pressure value deviation influence range data.

[0124] In the present invention, the comparative analysis of the pressure values is to make a comparative judgment on the allowable overlap pressure range based on the overlap surface pressure collection distribution data, and determine the location area where the pressure value does not fall within the allowable range. Similarly, if the pressure value does not fall within the allowable range, thermal damage will occur, and the range with the least thermal damage is the range defined by the minimum thermal damage distance. Therefore, the possible damage area range where the pressure value deviates is determined by judging whether the area size reaches the area size defined by the minimum thermal damage distance.

[0125] A system using the above-mentioned method for detecting three-dimensional pressure distribution on the fracture overlap surface of a demagnetization switch, the system comprising a model analysis unit, a pressure fitting unit, and a detection comparison unit;

[0126] The model analysis unit is used to obtain the scanned data of the demagnetization switch fracture joint surface, establish the switch joint surface model, and perform theoretical pressure analysis based on the model construction to form the demagnetization switch fracture joint surface model pressure data;

[0127] The pressure fitting unit is used to collect contact pressure data of the demagnetization switch fracture joint surface, and combines the switch joint surface model to perform pressure fitting analysis based on the collection position to form joint surface pressure collection distribution data;

[0128] The detection and comparison unit receives data from the model analysis unit and the pressure fitting unit, and is used to combine the demagnetization switch fracture lap joint model pressure data and the lap joint pressure collection distribution data to perform pressure deviation analysis and form lap joint pressure detection and analysis result data.

[0129] The system also includes a host computer, which is used to execute the above detection method.

[0130] Example 2:

[0131] A demagnetization switch is an electrical device used in generators and motors. It's primarily designed to quickly cut off the excitation current when the equipment shuts down or malfunctions, preventing damage from the persistent magnetic field. During normal operation, the demagnetization switch is closed. To ensure the demagnetization switch can provide the excitation current, the contact surface of the fracture must be stable.

[0132] Currently, the contact stability of the fracture joint surface can be measured by setting a thin film pressure sensor at the joint surface. How to reasonably utilize and analyze the measurement results to accurately detect the contact condition at the joint surface is a problem worth considering.

[0133] refer to Figure 1~Figure 2An embodiment of the present invention provides a three-dimensional pressure distribution detection method for the overlapping surface of a demagnetization switch fracture. The method establishes an overlapping surface model by collecting model data of the overlapping surface of the demagnetization switch fracture, and then can use the working characteristics and structural characteristics of the overlapping surface to analyze the contact reliability, and form overlapping pressure distribution data corresponding to the overlapping surface model. After the sensor data of the contact pressure is collected, on the one hand, combined with the overlapping surface model, it is possible to realize a reasonable analysis and determination of the pressure distribution of the overlapping surface in the actual state, and on the other hand, it can also be compared and analyzed with the overlapping pressure distribution data of the model to determine whether the pressure distributed on the overlapping surface meets the requirements of the working reliability of the demagnetization switch, thereby realizing accurate and reasonable detection of the overlapping pressure of the overlapping surface, ensuring effective real-time monitoring of the overlapping surface pressure distribution, and avoiding damage to the equipment caused by unreasonable overlapping surface pressure.

[0134] The method for detecting the three-dimensional pressure distribution on the joint surface of the demagnetization switch specifically includes the following steps:

[0135] S1: Obtain scanning data of the demagnetization switch fracture joint surface, establish a switch joint surface model, and perform theoretical pressure analysis based on the model construction to form the demagnetization switch fracture joint surface model pressure data.

[0136] Obtain scanning data of the demagnetization switch fracture overlap surface, establish a switch overlap surface model, and perform theoretical pressure analysis based on the model construction to form pressure data of the demagnetization switch fracture overlap surface model, including: based on the demagnetization switch fracture overlap surface scanning acquisition data, extract scanning size information and overlap surface material information for modeling processing to form a switch overlap surface model; perform pressure analysis on the switch overlap surface model based on structural stress and contact reliability to determine the allowable overlap pressure range; based on the demagnetization switch fracture overlap surface scanning acquisition data, extract overlap surface thermal damage information, and perform pressure change characteristic analysis in combination with the allowable overlap pressure range to form pressure data of the demagnetization switch fracture overlap surface model.

[0137] The main purpose of modeling the lap joint surface of the demagnetization switch is to obtain the characteristic range data of the contact pressure variation allowed under the condition that the lap joint surface can work reliably and stably, so as to use the characteristic range data as a reference for collecting real-time contact pressure data for comparative analysis, and to efficiently and accurately determine whether the real-time contact pressure affects the reliable and stable operation of the switch. It should be noted here that the established model is not a simple structural model based on structural data, but model data that gives the structure material characteristic information, that is, model data that can truly simulate the actual lap joint state. On this basis, the model is subjected to pressure distribution analysis based on the structural stress condition and lap joint reliability, and then the pressure distribution characteristic data allowed by the lap joint model is determined. The scanned acquisition data includes the three-dimensional structural data formed by the scan and the material information obtained by means other than spectral analysis.

[0138] Conduct pressure analysis on the switch joint surface model based on structural stress and contact reliability to determine the allowable joint pressure range, including: determining the reliability limit index, and using the reliability limit index as the analysis target, conducting contact analysis on the switch joint surface model with uniform pressure continuously changing on the entire joint surface to determine the reliable joint surface uniform pressure value. Taking the allowable stress of the lap joint structural material as the analysis target, the switch lap joint model is subjected to contact analysis with uniform pressure continuously changing on the entire lap joint surface to determine the uniform allowable pressure value of the lap joint surface. ; According to the reliability of the uniform pressure value of the lap joint Uniform allowable pressure value of the faying surface , forming the allowable overlap pressure range A, where A=[ , ],and < .

[0139] The characteristic information to be extracted regarding the pressure on the faying surface includes the maximum and minimum values of the contact pressure that can be achieved. The maximum achievable value is determined by the maximum force generated by contact before irreversible material changes occur. This model-specific force analysis only requires continuously increasing contact pressure values to determine the value, with the material allowable stress serving as the determination result. Regarding the minimum allowable value, it is understood that the lower the contact pressure, the greater the probability of poor contact. The reliability target for the faying surface can be determined based on actual conditions. For example, the reliability indicator can be the length of time after the faying surface pressure drops to a certain value while maintaining stable contact to ensure the flow of the excitation current. Alternatively, the reliability indicator can be the loss of excitation current after the faying surface pressure drops to a certain value. The allowable faying pressure range is determined by limiting the faying pressure in both directions. It should be noted that the pressure on the faying surface of the model was idealized in the analysis of the maximum value achieved and the minimum value allowed. That is, the pressure on the entire faying surface was the same. This helps in model analysis and avoids the situation where the local pressure is too high, resulting in an inaccurate measurement standard for the obtained results.

[0140] Based on the scanned data of the demagnetization switch fracture overlap surface, the thermal damage information of the overlap surface is extracted, and the pressure change characteristics are analyzed in combination with the allowable overlap pressure range to form the demagnetization switch fracture overlap surface model pressure data, including: According to the thermal damage information of the overlap surface, the minimum thermal damage distance is determined ; Based on the minimum thermal damage distance and the allowable overlap pressure range A to determine the maximum pressure change gradient ,in, ; Combined with the maximum pressure change gradient And the allowable overlap pressure range A, form the demagnetization switch fracture overlap surface model pressure data.

[0141] It is understandable that under ideal conditions, the entire lap joint surface is subjected to equal force. However, in reality, there may be local pressure differences that are higher or lower. This pressure difference may also cause overheating or arcing at a local location, thereby causing thermal damage within a certain range of the location. Therefore, the pressure gradient also needs to be analyzed. It is understandable that the greater the pressure change in a smaller area, the greater the probability of thermal damage in the corresponding area. Therefore, the characteristic information of the pressure change gradient is mainly determined by the rate of change of the maximum pressure difference within the allowable pressure range within the minimum distance range. Here, the minimum value of the historically smallest thermal damage area is used as the distance measure of the pressure change gradient to obtain the maximum pressure change gradient.

[0142] S2: Collect contact pressure data of the demagnetization switch fracture overlap surface, and combine the switch overlap surface model to perform pressure fitting analysis based on the collection position to form overlap surface pressure collection distribution data.

[0143] The contact pressure data of the lap joint of the demagnetization switch fracture is collected, and the pressure fitting analysis based on the collection position is performed in combination with the switch lap joint model to form the lap joint pressure collection distribution data, including: according to the switch lap joint model, a pressure transfer analysis is performed within the allowable stress range of the material to determine the maximum pressure loss gradient; according to the contact pressure data, the positions of different collected contact pressure values in the switch lap joint model are determined and calibrated as the collection point positions; according to the maximum pressure loss gradient and the corresponding collected contact pressure values at the collection point positions, the switch lap joint model is subjected to a collection pressure distribution analysis to form the lap joint pressure collection distribution data.

[0144] After obtaining the allowable overlap pressure range of the overlap surface and the limit value of the pressure change gradient, it can be used as a standard to compare and analyze the overlap surface pressure data collected in real time to determine the rationality of the current pressure. Of course, to achieve this comparison result, the collected overlap pressure data needs to be processed. After all, the overlap pressure data collected by the sensor is discrete, and the pressure distribution on the overlap surface is continuous. Therefore, the collected discrete data needs to be fitted to form continuous data. This fitting method mainly uses the collected overlap pressure values to perform a pressure change continuity analysis under the maximum loss gradient range. The pressure change continuity analysis mentioned here refers to fitting based on discrete overlap surface pressure data. It is necessary to ensure that the pressure value determined by fitting at the position where the overlap surface pressure is not detected is continuous, so as to be closer to the real-time situation.

[0145] According to the switch lap surface model, the pressure transmission analysis is carried out within the allowable stress range of the material to determine the maximum pressure loss gradient, including: the uniform pressure value of the reliability lap surface in the allowable lap pressure range A For the model force application value, select M spaced force application points on the lap joint surface and ensure that all force application points are evenly distributed on the lap joint surface; determine the angle interval value, take each force application point as the center of the circle, and determine the different pressure diffusion directions with an angle interval value on the entire circumference; each time a force application point is applied, the reliability lap joint uniform pressure value is applied to each force application point. , and obtain the pressure change gradients in all pressure diffusion directions corresponding to the force-applied position points; determine the average pressure change gradient of the corresponding position points based on all pressure change gradients corresponding to the force-applied position points; extract the largest average pressure change gradient of all force-applied position points and calibrate it as the maximum pressure loss gradient.

[0146] The main purpose of obtaining the maximum pressure loss gradient is to determine the characteristics of the lap joint material in pressure transmission, so that when using discrete pressure acquisition data to fit the pressure distribution on the entire lap joint, the pressure value at the uncollected position can be determined, and the determined pressure value can establish a continuously changing gradient relationship with the pressure value at the acquisition point. To obtain the maximum loss gradient, the first step is to input the same pressure value for each position point on the model, and then determine the gradient value of the pressure change in the direction of the entire circumferential line. The average value of these gradient values is then obtained as the gradient of the pressure transmission after the force is applied at the corresponding position. Finally, the maximum average pressure change gradient is used as the maximum pressure damage gradient value allowed for the entire model.

[0147] Based on the maximum pressure loss gradient and the corresponding collection contact pressure value at the collection point position, the switch overlap surface model is analyzed for collection pressure distribution to form overlap surface pressure collection distribution data, including: taking the maximum pressure loss gradient as the limit value for pressure diffusion, performing pressure fitting of the area between adjacent collection point positions based on the corresponding collection contact pressure values at different collection point positions, and ensuring that the pressure values on the line connecting any two points on the overlap surface have a continuous variation relationship within the limit range of the maximum pressure loss gradient; obtaining pressure data on the entire overlap surface to form overlap surface pressure collection distribution data.

[0148] Within the maximum damage gradient range, pressure values are fitted for the region of collected pressure values using discrete pressure values as the standard. The fitting must ensure that the resulting pressure data for the entire overlapped surface is stable along the line connecting the pressure values at any two locations. That is, the pressure gradient on the line is fixed and does not exceed the maximum loss gradient. When fitting the pressure between adjacent collection points, pressure values can be determined for each of the two collection points at different circumferential distances from the collection point, starting with the maximum loss gradient. This results in two pressure values for each location within the region, each representing a gradient change based on the two collection points. A determination is made as to whether two pressure values at the same location are identical. If so, no fitting adjustment is required. If not, all locations with the smallest difference between the two pressure values are identified. The smaller pressure value is then adjusted based on this point, replacing the smaller pressure value with the larger one. The loss gradient value is then determined based on the pressure values of the collection points corresponding to the smaller pressure value, resulting in a uniform pressure gradient. This results in a smooth regional pressure fitting distribution. Adjusting the smaller pressure value prevents the loss gradient value obtained after adjustment from exceeding the maximum loss gradient.

[0149] S3: Combine the demagnetization switch fracture joint surface model pressure data and the joint surface pressure collection distribution data to perform pressure deviation analysis to form joint surface pressure detection analysis result data.

[0150] Combined with the demagnetization switch fracture overlap surface model pressure data and the overlap surface pressure collection and distribution data, a pressure deviation analysis is performed to form the overlap surface pressure detection and analysis result data, including: based on the demagnetization switch fracture overlap surface model pressure data, a comparative analysis of the overlap surface pressure collection and distribution data based on the pressure change gradient is performed to determine the pressure gradient deviation influence range data; based on the demagnetization switch fracture overlap surface model pressure data, a comparative analysis of the pressure range of the overlap surface pressure collection and distribution data is performed to form the pressure value deviation influence range data.

[0151] Once the distribution data is acquired, it can be compared and analyzed with the pressure data from the faying surface model. This comparative analysis considers two aspects: one is excessive local pressure variations, which can easily cause local thermal damage and therefore require analysis and confirmation; the other is that each pressure value on the faying surface is within the range specified by the pressure data from the faying surface model. Only when both aspects are compared and analyzed can the detection and processing of the faying surface three-dimensional pressure distribution be achieved.

[0152] According to the pressure data of the demagnetization switch fracture overlap model, the overlap surface pressure collection distribution data is compared and analyzed based on the pressure change gradient to determine the pressure gradient deviation impact range data, including: according to the overlap surface pressure collection distribution data, the pressure change value is extracted to determine the pressure change rate distribution data on the entire overlap surface; according to the pressure change rate distribution data, the maximum pressure change gradient is compared. , determine that the pressure change rate exceeds the maximum pressure change gradient The location area and determine the maximum gradient change area distance of the location area , n means that the determined pressure change rate exceeds the maximum pressure change gradient Numbering of different position areas; according to the minimum thermal damage distance , and for different maximum gradient change area distances Determine the following impact range: > , then determine the distance of the maximum gradient change area The midpoint of the line segment, with the midpoint as the center, with the minimum thermal damage distance is the diameter, determine the corresponding pressure gradient deviation influence range area; if ≤ , then the distance of the maximum gradient change area The midpoint of the line segment is the center of the circle, and the distance from the maximum gradient change area is For the diameter, the corresponding pressure gradient deviation influence range area is determined; all different pressure gradient deviation influence range areas are collected to form pressure gradient deviation influence range data.

[0153] Comparative analysis of pressure gradients is achieved by taking the first-order derivative of the position-based pressure distribution data collected from the faying surface and then generating rate-of-change data for comparative analysis. Areas exceeding the maximum pressure gradient are calibrated. Considering the potential for thermal damage from excessive gradients, the minimum thermal damage distance is used to define the area. After all, to create a thermal damage area, the area must be large enough to fit within the minimum thermal damage distance.

[0154] According to the pressure data of the demagnetization switch fracture overlap surface model, the overlap surface pressure collection distribution data is compared and analyzed to form the pressure value deviation influence range data, including: according to the overlap surface pressure collection distribution data, the allowable overlap pressure range A is compared to determine the position area where the pressure value does not belong to the allowable overlap pressure range A, and determine the maximum pressure value change area distance of the position area ; Based on the minimum thermal damage distance , and the distance between the different maximum pressure value changes Determine the following impact range: > , then determine the distance of the maximum pressure value change area The midpoint of the line segment, with the midpoint as the center, with the minimum thermal damage distance is the diameter, determine the corresponding pressure value deviation from the affected range; if ≤ , then the distance of the area with the maximum pressure value change The midpoint of the line segment is the center of the circle, and the distance from the maximum pressure value change area For the diameter, determine the corresponding pressure value deviation influence range area; collect all different pressure value deviation influence range areas to form pressure value deviation influence range data.

[0155] The comparative analysis of pressure values is to make a comparative judgment on the allowable overlap pressure range based on the overlap surface pressure collection distribution data, and determine the location area where the pressure value does not fall within the allowable range. Similarly, if the pressure value does not fall within the allowable range, thermal damage will occur, and the range with the least thermal damage is the range defined by the minimum thermal damage distance. Therefore, the possible damage area range where the pressure value deviates is determined by judging whether the area size reaches the area size defined by the minimum thermal damage distance.

[0156] The present invention also provides a three-dimensional pressure distribution detection system for the overlapping surface of the demagnetization switch fracture based on a thin film pressure sensor. The system includes: a model analysis unit, which is used to obtain scanning and acquisition data of the overlapping surface of the demagnetization switch fracture, and establish model pressure data of the overlapping surface of the demagnetization switch fracture; a pressure fitting unit, which is used to collect contact pressure data of the overlapping surface of the demagnetization switch fracture for pressure fitting analysis to form overlapping surface pressure acquisition distribution data; a detection comparison unit, which is used to compare the demagnetization switch fracture overlapping surface model pressure data of the model analysis unit with the overlapping surface pressure acquisition distribution data of the pressure fitting unit to form overlapping surface pressure detection distribution result data.

Claims

1. A method for detecting three-dimensional pressure distribution on the joint surface of a demagnetization switch, characterized in that: include: Obtain scanning data of the demagnetization switch fracture joint surface, establish a switch joint surface model, and perform theoretical pressure analysis based on the model construction to form the demagnetization switch fracture joint surface model pressure data; Collecting contact pressure data of the lap joint surface of the demagnetization switch fracture, and performing pressure fitting analysis based on the collection position in combination with the switch lap joint surface model to form lap joint surface pressure collection distribution data; Combining the demagnetization switch fracture lap joint model pressure data and the lap joint pressure collection distribution data, performing pressure deviation analysis to form lap joint pressure detection analysis result data; The contact pressure data of the demagnetization switch fracture overlap surface is collected, and pressure fitting analysis based on the collection position is performed in combination with the switch overlap surface model to form overlap surface pressure collection distribution data, including: Based on the switch overlap surface model, a pressure transmission analysis is performed within the allowable stress range of the material to determine the maximum pressure loss gradient; According to the contact pressure data, positions of different collected contact pressure values in the switch overlap surface model are determined and marked as collection point positions; According to the maximum pressure loss gradient and the collected contact pressure value corresponding to the collection point position, a collection pressure distribution analysis is performed on the switch overlap surface model to form the overlap surface pressure collection distribution data.

2. The method for detecting three-dimensional pressure distribution on the fracture joint surface of a demagnetization switch according to claim 1, characterized in that: The acquisition of the demagnetization switch fracture overlap surface scanning data, establishment of the switch overlap surface model, and the theoretical pressure analysis based on the model construction to form the demagnetization switch fracture overlap surface model pressure data includes: Based on the scanned data collected from the demagnetization switch fracture joint surface, the scanned dimension information and the joint surface material information are extracted for modeling and processing to form a switch joint surface model; Performing a pressure analysis on the switch overlap surface model based on structural stress and contact reliability to determine an allowable overlap pressure range; Based on the scanned data collected from the deexcitation switch fracture overlap surface, the overlap surface thermal damage information is extracted, and the pressure change characteristics are analyzed in combination with the allowable overlap pressure range to form the deexcitation switch fracture overlap surface model pressure data.

3. The method for detecting three-dimensional pressure distribution on the fracture joint surface of a demagnetization switch according to claim 2, characterized in that: The pressure analysis of the switch overlap surface model based on structural stress and contact reliability is performed to determine the allowable overlap pressure range, including: Determine the reliability limit index, and use the reliability limit index as the analysis target to perform contact analysis on the switch joint surface model with the uniform pressure continuously changing on the entire joint surface, and determine the reliability joint surface uniform pressure value ; Taking the allowable stress of the lap joint structure material as the analysis target, the contact analysis of the switch lap joint model with the uniform pressure continuously changing on the entire lap joint surface is performed to determine the uniform allowable pressure value of the lap joint surface. ; According to the reliability uniform pressure value of the lap joint and the uniform allowable pressure value of the lap joint , forming the allowable overlap pressure range A, where A=[ , ],and < .

4. The method for detecting three-dimensional pressure distribution on the fracture joint surface of a demagnetization switch according to claim 3, characterized in that: The method includes: collecting data from the demagnetization switch fracture overlap surface scanning, extracting overlap surface thermal damage information, and performing pressure change characteristic analysis in combination with the allowable overlap pressure range to form the demagnetization switch fracture overlap surface model pressure data, including: According to the thermal damage information of the lap joint, the minimum thermal damage distance is determined ; According to the minimum thermal damage distance and the allowable overlap pressure range A, determine the maximum pressure change gradient ,in, ; Combined with the maximum pressure gradient and the allowable overlap pressure range A to form the pressure data of the demagnetization switch fracture overlap surface model.

5. The method for detecting three-dimensional pressure distribution on the fracture joint surface of a demagnetization switch according to claim 4, characterized in that: The pressure transmission analysis is performed within the allowable stress range of the material based on the switch overlap surface model to determine the maximum pressure loss gradient, including: The uniform pressure value of the reliable lap joint surface in the allowable lap joint pressure range A is is the force applied value of the model, M spaced force application points are selected on the overlap surface, and all the force application points are evenly distributed on the overlap surface; Determine an angular interval value, and determine different pressure diffusion directions spaced apart by the angular interval value on the entire circumference with each of the force application positions as the center of the circle; Apply the uniform pressure value of the reliability lap joint to each force application point each time , and obtaining the pressure change gradients in all pressure diffusion directions corresponding to the force application position points; Determining an average pressure change gradient at the corresponding position point based on all the pressure change gradients corresponding to the force applied position point; The maximum average pressure change gradient of all the force-applied position points is extracted and calibrated as the maximum pressure loss gradient.

6. The method for detecting three-dimensional pressure distribution on the fracture joint surface of a demagnetization switch according to claim 5, characterized in that: The step of performing pressure distribution analysis on the switch interface model based on the maximum pressure loss gradient and the corresponding contact pressure value at the acquisition point to form the interface pressure distribution data includes: Taking the maximum pressure loss gradient as the limiting value for pressure diffusion, pressure fitting is performed on the area between adjacent collection points based on the corresponding collected contact pressure values at different collection points, and ensuring that the pressure values on the line connecting any two points on the overlapped surface have a continuously varying relationship within the limiting range of the maximum pressure loss gradient; The pressure data on the entire faying surface is acquired to form the faying surface pressure collection distribution data.

7. The method for detecting three-dimensional pressure distribution on the fracture joint surface of a demagnetization switch according to claim 6, characterized in that: The pressure deviation analysis is performed by combining the demagnetization switch fracture joint surface model pressure data and the joint surface pressure collection distribution data to form the joint surface pressure detection analysis result data, including: According to the pressure data of the demagnetization switch fracture overlap surface model, comparative analysis is performed on the overlap surface pressure collection distribution data based on the pressure change gradient to determine the pressure gradient deviation influence range data; According to the demagnetization switch fracture overlap surface model pressure data, the overlap surface pressure collection distribution data is subjected to a comparative analysis of pressure ranges to form pressure value deviation influence range data.

8. The method for detecting three-dimensional pressure distribution on the fracture joint surface of a demagnetization switch according to claim 7, characterized in that: The method of performing comparative analysis on the pressure distribution data of the lap joint surface based on the pressure change gradient according to the pressure data of the lap joint surface model of the demagnetization switch fracture to determine the pressure gradient deviation influence range data includes: Extracting the pressure change value based on the pressure distribution data collected on the lap joint surface to determine the pressure change rate distribution data on the entire lap joint surface; According to the pressure change rate distribution data, the maximum pressure change gradient is compared , determine that the pressure change rate exceeds the maximum pressure change gradient The location area and determine the maximum gradient change area distance of the location area , n indicates that the determined pressure change rate exceeds the maximum pressure change gradient The numbers of different location areas; According to the minimum thermal damage distance , and for different maximum gradient change area distances Determine the following impact areas: like > , then determine the maximum gradient change area distance The midpoint of the line segment, with the midpoint as the center, and the minimum thermal damage distance is the diameter, and the corresponding pressure gradient deviation influence range is determined; like ≤ , then the distance of the maximum gradient change area The midpoint of the line segment is the center of the circle, and the distance from the maximum gradient change area is is the diameter, and the corresponding pressure gradient deviation influence range is determined; All the different pressure gradient deviation influence range areas are collected to form the pressure gradient deviation influence range data.

9. The method for detecting three-dimensional pressure distribution on the fracture joint surface of a demagnetization switch according to claim 8, characterized in that: The pressure range comparison analysis of the pressure collection distribution data of the lap joint according to the demagnetization switch fracture lap joint model pressure data is performed to form the pressure value deviation influence range data, including: According to the pressure distribution data of the lap joint surface, the pressure value is compared with the allowable lap joint pressure range A, and the position area where the pressure value does not belong to the allowable lap joint pressure range A is determined, and the maximum pressure value change area distance of the position area is determined. ; According to the minimum thermal damage distance , and the maximum pressure value change area distance for different Determine the following impact areas: like > , then determine the distance of the maximum pressure value change area The midpoint of the line segment, with the midpoint as the center, and the minimum thermal damage distance For the diameter, determine the corresponding pressure value deviation from the affected range area; like ≤ , then the distance of the area with the maximum pressure value change The midpoint of the line segment is the center of the circle, and the distance from the maximum pressure value change area is For the diameter, determine the corresponding pressure value deviation from the affected range area; All the different pressure value deviation influence range areas are collected to form the pressure value deviation influence range data.

10. A system using the method for detecting three-dimensional pressure distribution on the fracture joint surface of a demagnetization switch according to claim 9, characterized in that: The system includes a model analysis unit, a pressure fitting unit and a detection and comparison unit; The model analysis unit is used to obtain the scanned data of the demagnetization switch fracture joint surface, establish the switch joint surface model, and perform theoretical pressure analysis based on the model construction to form the demagnetization switch fracture joint surface model pressure data; The pressure fitting unit is used to collect contact pressure data of the demagnetization switch fracture joint surface, and combines the switch joint surface model to perform pressure fitting analysis based on the collection position to form joint surface pressure collection distribution data; The detection and comparison unit receives data from the model analysis unit and the pressure fitting unit, and is used to combine the demagnetization switch fracture lap joint model pressure data and the lap joint pressure collection distribution data to perform pressure deviation analysis and form lap joint pressure detection and analysis result data.

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