Thickness testing method and device for brake disc

Abstract

The invention discloses a brake disc thickness testing method and equipment, and the method comprises the steps: obtaining outer end jump data and inner end jump data, and calculating thickness uniformity data according to the outer end jump data and the inner end jump data; determining all wave crests in the thickness uniformity data; screening all wave crests, and only reserving the wave crests meeting the pore screening condition; reserved peaks in the thickness uniformity data are removed. According to the method, the influence of punching on data can be effectively eliminated, the thickness distribution and change conditions of the brake disc can be more accurately presented by removing abnormal wave crests in the hole data, the uniformity and performance of the brake disc can be more effectively evaluated, and the reliability of a thickness detection result is improved. And the method has no special requirements on the data recording process, and has high flexibility and wide adaptability.

Description

Technical Field

[0001] The invention relates to the field of automobile brake testing, and in particular to a brake disc thickness testing method and equipment. Background Art

[0002] The thickness test of the brake disc can help analyze the problems of the car's brake tremor, steering wheel vibration, noise, etc. The thickness test of the brake disc generally analyzes the thickness uniformity (DTV, Disc Thickness Variation) data of the brake disc. The DTV data reflects the thickness distribution of different parts of the brake disc during rotation and is an important indicator for evaluating the uniformity and performance stability of the brake disc. Since the DTV of the brake disc is a numerical deviation of μm level, it needs to be measured by a high-precision displacement sensor, such as Figure 1 As shown, a plurality of displacement sensors 20 are arranged at the relative positions of the end surfaces on both sides of the brake disc 10. During the rotation of the brake disc 10, the displacement sensor 20 on one side detects the outer end jump data, and the displacement sensor 20 on the other side detects the inner end jump data.

[0003] However, when the perforated brake disc rotates, the holes on the brake disc will cause abnormal fluctuations in the displacement sensor in the hole area, mixing a lot of noise into the thickness measurement data. When analyzing the DTV data, the data at the hole will be disturbed, and even the actual thickness change of the brake disc cannot be accurately reflected, which seriously affects the measurement accuracy and cannot objectively describe the thickness change law of the brake disc, resulting in measurement result deviation. Therefore, how to accurately analyze the thickness data without being disturbed by the holes is one of the key issues that need to be solved in brake disc thickness detection. Summary of the invention

[0004] In order to solve the problem of abnormal data interference caused by drilling in the thickness detection of the above-mentioned perforated brake disc, the purpose of the present invention is to provide a brake disc thickness testing method and equipment that can effectively eliminate the influence of drilling on the data.

[0005] To achieve the above-mentioned object of the invention, an embodiment of the present invention provides a method for testing the thickness of a brake disc, comprising the following steps:

[0006] Acquire outer end jump data and inner end jump data, wherein the outer end jump data and the inner end jump data are data acquired at the outer side and the inner side of the brake disc respectively;

[0007] Calculating thickness uniformity data according to the outer end jump data and the inner end jump data;

[0008] Determine all the peaks in the thickness uniformity data, wherein the peak starting point of each peak is the rising edge of the data change, and the peak end point of each peak is the falling edge of the data change;

[0009] Screening all the peaks and retaining only the peaks that meet the hole screening condition, wherein the hole screening condition is that the difference between the peak value and the peak starting point is greater than a first preset value, or the difference between the peak value and the peak end point is greater than a second preset value;

[0010] Remaining peaks in the thickness uniformity data are removed.

[0011] As a further improvement of the present invention, the steps are also included:

[0012] The outer-end jump data and the inner-end jump data are subjected to high-frequency filtering to reduce noise points in the outer-end jump data and the inner-end jump data.

[0013] As a further improvement of the present invention, the calculation method of the thickness uniformity data is: DTV[i]=(RunIn[i]+RunOut[i])-Min(RunIn+Runout), wherein DTV[i] is the thickness uniformity data, RunIn[i] is the inner end jump data, RunOut[i] is the outer end jump data, and Min(RunIn+Runout) is the sum of the minimum values ​​of the inner end jump data and the outer end jump data.

[0014] As a further improvement of the present invention, the steps are also included:

[0015] Replacing the position of the removed peak in the thickness uniformity data with the fitting data to obtain corrected thickness uniformity data;

[0016] The corrected thickness uniformity data is subjected to order analysis by Fourier transform.

[0017] As a further improvement of the present invention, the fitting data is calculated by interpolation method to achieve a smooth transition between the peak starting point and the peak end point where the peak is removed.

[0018] As a further improvement of the present invention, the calculation method of the fitting data is: taking the difference between the amplitude of the peak end point and the amplitude of the peak starting point, and the quotient of the number of points between the peak end point and the peak starting point as an increasing term, and the amplitude of the position of each point between the peak end point and the peak starting point increases successively according to the increasing term.

[0019] To achieve one of the above-mentioned purposes of the invention, an embodiment of the present invention provides a method for testing the thickness of a brake disc, comprising the following steps:

[0020] Acquire outer end jump data and inner end jump data, wherein the outer end jump data and the inner end jump data are data acquired at the outer side and the inner side of the brake disc respectively;

[0021] Determine all the peaks in the outer-end jump data and / or the inner-end jump data, wherein the peak starting point of each peak is the rising edge of the data change, and the peak end point of each peak is the falling edge of the data change;

[0022] Screening all the peaks and retaining only the peaks that meet the hole screening condition, wherein the hole screening condition is that the difference between the peak value and the peak starting point is greater than a first preset value, or the difference between the peak value and the peak end point is greater than a second preset value;

[0023] Using the peak start point and the peak end point of the filtered peak as indexes, removing the wave band between the corresponding peak start point and the peak end point in the outer end jump data and the inner end jump data;

[0024] Thickness uniformity data is calculated based on the outer end jump data and the inner end jump data.

[0025] As a further improvement of the present invention, the removing of the wave band between the corresponding wave peak starting point and wave peak ending point in the outer end jump data and the inner end jump data comprises:

[0026] After the wave band between the corresponding wave peak starting point and wave peak end point in the outer end jump data is removed, the removed wave band is replaced with fitting data, wherein the fitting data enables a smooth transition between the wave peak starting point and the wave peak end point where the wave peak in the outer end jump data is removed;

[0027] After the band between the corresponding peak start point and peak end point in the inner end jump data is removed, the removed band is replaced with fitting data, wherein the fitting data enables a smooth transition between the peak start point and the peak end point where the peak in the inner end jump data is removed.

[0028] To achieve one of the above-mentioned purposes of the invention, an embodiment of the present invention provides a brake disc thickness testing device, comprising:

[0029] A displacement sensor, at least one displacement sensor is disposed on each side of the brake disc;

[0030] A storage module storing a computer program;

[0031] The processing module can implement the steps in the above-mentioned brake disc thickness testing method when executing the computer program.

[0032] To achieve one of the above-mentioned purposes of the invention, an embodiment of the present invention provides a readable storage medium storing a computer program, which can implement the steps in the above-mentioned brake disc thickness testing method when executed by a processing module.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) This method can effectively eliminate the impact of drilling on the data. By removing abnormal peaks in the hole data, it can more accurately present the thickness distribution and changes of the brake disc, help to more effectively evaluate the uniformity and performance of the brake disc, and improve the reliability of the thickness detection results.

[0035] (2) This method does not depend on how the data is obtained. Thickness detection data from different sources and in different formats can be used to eliminate the interference peaks caused by holes. In other words, this method has no special requirements for the data recording process and has high flexibility and wide adaptability, so that the measurement results can more truly reflect the actual thickness changes of the brake disc.

[0036] (3) This method does not affect the integrity of the outer-end jump data and the inner-end jump data in terms of the removal of the punctured data. The complete outer-end jump data and the inner-end jump data can also be applied to other analysis scenarios.

[0037] Therefore, under the premise of keeping the original data intact, this method makes thickness detection more flexible to adapt to different detection requirements and data formats without being disturbed by holes. Removing the influence of holes improves the reliability of thickness detection results and helps detection and production personnel to more accurately identify possible structural defects or uneven areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram of a brake disc detection device according to an embodiment of the present invention;

[0039] Figure 2 is a flow chart of a brake disc thickness testing method according to Embodiment 1 of the present invention;

[0040] Figure 3 is a schematic diagram of original outer end jump data, inner end jump data and thickness uniformity data of Example 1 of the present invention;

[0041] Figure 4 is a schematic diagram of outer end jump data, inner end jump data and thickness uniformity data after high frequency filtering in Example 1 of the present invention;

[0042] Figure 5 is a schematic diagram of determining all peaks in step S30 of embodiment 1 of the present invention;

[0043] Figure 6 is a schematic diagram of screening out peaks meeting the hole screening conditions in step S40 of embodiment 1 of the present invention;

[0044] Figure 7 is a schematic diagram of a curve obtained after step S51 of embodiment 1 of the present invention;

[0045] Figure 8is a schematic diagram of order analysis obtained after step S60 of embodiment 1 of the present invention;

[0046] Fig. 9 is a flow chart of a brake disc thickness testing method according to Embodiment 2 of the present invention;

[0047] Among them, 10, brake disc; 11, drilling; 20, displacement sensor. DETAILED DESCRIPTION

[0048] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0049] An embodiment of the present invention provides a brake disc thickness testing method and device that can effectively eliminate the influence of drilling on the data. The method eliminates the influence of holes on the data by identifying and removing abnormal peaks, so that the thickness detection data can more smoothly and accurately reflect the actual thickness distribution of the brake disc, thereby improving the accuracy and stability of thickness uniformity measurement.

[0050] like Figure 1 As shown, the brake disc 10 of this embodiment is a brake disc 10 with multiple holes 11 on the surface. During the thickness test, a number of displacement sensors 20 are set on the end faces of both sides of the brake disc 10. During the rotation of the brake disc 10, the displacement sensor 20 on one side monitors the displacement change of the outer end, while the displacement sensor 20 on the other side monitors the displacement change of the inner end. The displacement sensor 20 can be aligned with the physical part of the brake disc 10 or with the hollow position of the hole 11. During the test, the brake disc 10 keeps rotating at a low speed and collects data from the two non-contact displacement sensors 20 in real time. After one or more rotations, the change in the sum of the displacements of the two sensors is the DTV of the brake disc 10.

[0051] The brake disc thickness testing method of the present embodiment does not depend on how the data is acquired. Thickness detection data from different sources and in different formats can be applied to eliminate interference peaks caused by holes. In other words, the method has no special requirements for the data recording process. The displacement change data of the outer and inner ends acquired by various manufacturers can be tested using the brake disc thickness testing method of the present embodiment. It has high flexibility and wide adaptability, so that the measurement results can more truly reflect the actual thickness changes of the brake disc.

[0052] The following two embodiments illustrate different brake disc thickness testing methods respectively. The difference lies in the processing order and the processing objects. In Embodiment 1, the thickness uniformity data is calculated first, and then the thickness uniformity data is processed; in Embodiment 2, the outer end jump data and / or the inner end jump data are processed first, and then the thickness uniformity data is calculated.

[0053] Example 1

[0054] Combine the following Figure 2 to Figure 8 , describing a brake disc thickness testing method provided by an embodiment of the present invention. Although the present application provides method operation steps as shown in the following implementation manner or flow chart, based on routine or no creative labor, in the steps of the method where there is no necessary causal relationship logically, the execution order of these steps is not limited to the execution order provided in the implementation manner of the present application.

[0055] The brake disc thickness testing method of this embodiment includes the following steps:

[0056] Step S10: Acquire the outer-end jump data and the inner-end jump data.

[0057] Step S20: Calculating thickness uniformity data according to the outer end jump data and the inner end jump data.

[0058] Step S30: determining all peaks in the thickness uniformity data.

[0059] Step S40: Screening all the peaks and retaining only the peaks that meet the hole screening conditions, wherein the hole screening conditions are that the difference between the peak value and the peak starting point is greater than a first preset value, or the difference between the peak value and the peak end point is greater than a second preset value.

[0060] Step S50: removing the remaining peaks in the thickness uniformity data.

[0061] The outer end jump data and the inner end jump data obtained in step S10 can be as follows: Figure 3 As shown in or 4, the outer end jump data is detected by a displacement sensor arranged on one side of the brake disc, and the inner end jump data is detected by a displacement sensor arranged on the other side of the brake disc. The inner end jump data and the outer end jump data represent the thickness changes of the inner and outer sides of the brake disc respectively.

[0062] The thickness uniformity data calculated in step S20 is as follows: Figure 3 Or as shown by the red DTV line in 4.

[0063] All the peaks determined in step S30 are as follows Figure 5As shown in the blue circle in the figure, the peak starting point refers to the starting point of the data peak of the curve where the thickness uniformity data is located. The peak starting point is the rising edge of the data change, that is, there is a rising trend from the peak starting point; the peak end point is the end point of the data peak of the curve where the thickness uniformity data is located. The peak end point is the falling edge of the data change, that is, there is a falling trend from the peak end point. In addition, between each peak starting point and peak end point, if the front and back of a point are smaller than itself, then this point is the peak point.

[0064] Step S40: After the screening, the peaks retained are as follows: Figure 6 As shown in the remaining blue circles in the figure, the first preset value and the second preset value can be set as needed. The larger the first preset value and the second preset value are, the more peaks will be filtered out in step S40, and vice versa. By determining the appropriate first preset value and the second preset value, Figure 6 The retained peaks are the peaks at the corresponding positions of the punching holes.

[0065] In step S50, the retained peaks can be directly deleted, or the peaks can be removed first and then re-assigned in other ways. If the peaks are deleted directly, multiple discrete bands are obtained. If the peaks are re-assigned, the new thickness uniformity data can be obtained as follows: Figure 7 shown.

[0066] This embodiment obtains the inner end jump data and the outer end jump data, calculates the thickness uniformity data, and identifies and screens the abnormal peaks in the thickness uniformity data to remove the hole interference. The thickness uniformity data (DTV) calculates the thickness difference between the inner and outer sides of the brake disc when it rotates. This process determines the numerical changes between the starting point and the end point of the peak and eliminates the abnormal data caused by drilling, thereby improving the accuracy of the data. After filtering and eliminating the peaks that meet the hole screening conditions, the measured data is not affected by the holes, making the thickness uniformity data more stable and continuous, avoiding distortion due to hole interference, and achieving the effect of accurately evaluating the thickness distribution of the brake disc.

[0067] Furthermore, the brake disc thickness testing method further includes step S11: high-frequency filtering the outer end jump data and the inner end jump data to reduce noise points in the outer end jump data and the inner end jump data.

[0068] The outer end jump data and inner end jump data obtained in step S10 can be processed using high-frequency filtering. High-frequency filtering can remove the higher-frequency noise components in the collected data, making the end jump data smoother and more continuous, further improving the accuracy of the thickness uniformity data, and ensuring better results for subsequent data processing and abnormality screening.

[0069] The noise in the end-jump data is caused by the precision error of the measurement system and environmental interference. The fluctuation caused by these noises can be significantly reduced by high-frequency filtering. In this embodiment, high-frequency filtering can be performed in the following manner:

[0070] The brake disc of this embodiment rotates one circle at a uniform speed in 12 seconds, and the maximum frequency (corresponding to the number of rotating reinforcing ribs) is 60 times / circle. According to the calculation based on the rotation speed and the number of ribs, 12 seconds can change up to 60 times, and 5Hz is determined as the maximum frequency of the order analysis. The sampling frequency of the displacement sensor is set to 500Hz, which is much higher than 5Hz, ensuring that the measurement data will not lose important frequency components. The high-frequency filtering of this embodiment adopts mean filtering, and the filter window is set to one-tenth of the sampling frequency, that is, 50 sampling points. Calculating the average value of 50 points each time is equivalent to reducing the sampling frequency from 500Hz to 10Hz, which can suppress high-frequency noise higher than 10Hz and only retain frequency components lower than 10Hz, especially frequencies below 5Hz, which satisfies the Lequist sampling theorem and ensures that while removing high-frequency noise, important frequency components below 5Hz will not be lost, so that the subsequent calculation of thickness data remains true and valid.

[0071] The initial external hopping data and internal hopping data are as follows: Figure 3 As shown, the outer end jump data and the inner end jump data obtained after step S11 are as follows Figure 4 As shown in the figure, by using mean filtering, the high-frequency noise in the original sampled data is significantly reduced, thereby obtaining smoother DTV data. The filtered data is not only more stable, but also effectively retains the true frequency characteristics of the thickness uniformity data, laying the foundation for subsequent order analysis.

[0072] Furthermore, the thickness uniformity data is calculated as follows:

[0073] DTV[i]=(RunIn[i]+RunOut[i])-Min(RunIn+Runout),

[0074] Wherein, DTV[i] is the thickness uniformity data, RunIn[i] is the inner end jump data, RunOut[i] is the outer end jump data, and Min(RunIn+Runout) is the sum of the minimum values ​​of the inner end jump data and the outer end jump data.

[0075] Through this calculation method, the larger the number of the thickness uniformity data, the greater the degree of deviation, which is the position of the hole and also corresponds to the position of the peak.

[0076] Further, as described above, the position where the peak is removed from the thickness uniformity data can be left blank and the maximum DTV can be determined through the data. Alternatively, the position can be filled in by the following steps:

[0077] Step S51: replacing the position of the removed peak in the thickness uniformity data with the fitting data to obtain the corrected thickness uniformity data.

[0078] The fitting data can be replaced using the method below, or it can be replaced with a uniform value, or it can be replaced with a pre-set value. Step S51 removes the peak position in the thickness uniformity data and replaces it with the fitting data, which makes the thickness uniformity data continuous in the hole interference area, which is beneficial to the subsequent order analysis.

[0079] Furthermore, the fitting data is calculated by interpolation method to achieve a smooth transition between the peak starting point and the peak end point where the peak is removed.

[0080] By performing interpolation fitting in the area where the peak data is removed, the interpolation method is used to fill the data gap caused by the peak removal, so that the removed data can be smoothly connected to maintain the continuity and consistency of the data.

[0081] The interpolation method can generate a smooth transition data sequence based on the data trend of the peak area and the known data before and after it. The data of the removed peak area is fitted by interpolation to avoid leaving blanks after removing the peak data. This method can better reflect the actual situation of the thickness data, avoid data mutation, and form a continuous thickness uniformity data curve.

[0082] Interpolation methods that can be used include linear interpolation, polynomial interpolation, spline interpolation, Lagrange interpolation, piecewise linear interpolation, nearest neighbor interpolation, Gaussian interpolation, etc., and a suitable interpolation method can be selected in combination with data characteristics and accuracy requirements. For example, linear interpolation is suitable for fast and smooth transition; polynomial interpolation and spline interpolation are more suitable for more complex thickness changes; and spline interpolation is particularly suitable for smooth transition requirements. This embodiment uses the interpolation method to generate smooth thickness uniformity data after removing the peak, ensuring data continuity and accuracy, which is beneficial to subsequent order analysis, thereby accurately reflecting the thickness distribution of the perforated brake disc.

[0083] Furthermore, the calculation method of the fitting data is: taking the difference between the amplitude of the peak end point and the amplitude of the peak starting point, and the quotient of the number of points between the peak end point and the peak starting point as an increasing term, and the amplitude of the position of each point between the peak end point and the peak starting point is increased successively according to the increasing term.

[0084] This implementation method is to establish a linear relationship between two known data points, that is, to transition between the peak start and end with a uniform slope to generate a smooth straight line, so as to simply and quickly calculate the fitting data corresponding to each band. It is suitable for data with small fluctuations or scenarios that require a fast and smooth transition, so that a thickness data sequence that conforms to the overall trend is formed between the peak start and end. This not only ensures the smoothness of the data, but also retains the overall trend and continuity of the test data, forming a measurement curve that is more in line with the actual thickness distribution, which is convenient for subsequent analysis and use. Through this interpolation method, the data finally obtained Figure 7 shown.

[0085] Furthermore, the brake disc thickness testing method further comprises the steps of:

[0086] Step S60: performing order analysis on the corrected thickness uniformity data through Fourier transform.

[0087] Fourier transform can decompose the periodic components in the thickness data into different orders, providing a basis for the spectrum analysis of thickness changes. Through order analysis, the frequency characteristics of the brake disc thickness change can be accurately identified, and the periodic fluctuations caused by manufacturing defects, wear or other factors can be distinguished to form spectrum information of thickness uniformity, thereby improving the diagnosis and analysis capabilities of thickness data and making the judgment of the cause of brake disc thickness changes more intuitive. The schematic diagram after the order analysis in step S60 is shown in FIG. Figure 8 As shown in the figure, the more prominent peaks are 1Hz and 4Hz. According to the fact that the brake disc rotates one circle in 12 seconds, it can be obtained that the brake disc has a change pattern of 12 times and 48 times in one circle, which can be inferred that the brake disc has such a deformation structure.

[0088] Example 2

[0089] The thickness testing method of the brake disc provided in this embodiment is as follows: Fig. 9 As shown, the following steps are included:

[0090] Step S10: acquiring outer end jump data and inner end jump data, wherein the outer end jump data and the inner end jump data are data acquired at the outer side and the inner side of the brake disc respectively;

[0091] Step S30': determining all the peaks in the outer-end jump data and / or the inner-end jump data, wherein the peak starting point of each peak is the rising edge of the data change, and the peak ending point of each peak is the falling edge of the data change;

[0092] Step S40': screening all the peaks and retaining only the peaks that meet the hole screening condition, wherein the hole screening condition is that the difference between the peak value and the peak starting point is greater than a first preset value, or the difference between the peak value and the peak end point is greater than a second preset value;

[0093] Step S50': using the peak start point and the peak end point of the screened peak as indexes, removing the wave band between the corresponding peak start point and the peak end point in the outer end jump data and the inner end jump data;

[0094] Step S20 ′: Calculating thickness uniformity data according to the outer end jump data and the inner end jump data.

[0095] Example 2 proposes a new thickness uniformity data processing sequence, that is, before calculating the thickness uniformity data, the outer end jump data and the inner end jump data are used to screen and remove abnormal peaks, so that the thickness uniformity data can be directly generated without the interference of drilling. Among them, steps S40' to S50' remove the abnormal peaks in the hole interference area, and step S20' calculates the thickness uniformity data based on the adjusted end jump data, which can reduce the cumulative effect of hole interference and further improve the accuracy and stability of thickness detection. This method is suitable for thickness detection that requires high precision, ensuring that the final thickness uniformity data more truly reflects the thickness characteristics of the brake disc.

[0096] Furthermore, the step S50' further comprises:

[0097] Step S51': after removing the wave band between the corresponding wave peak starting point and wave peak ending point in the outer end jump data, replacing the removed wave band with fitting data, wherein the fitting data enables a smooth transition between the wave peak starting point and the wave peak ending point where the wave peak removed in the outer end jump data is located;

[0098] Step S52': after removing the corresponding band between the peak start point and the peak end point in the inner end jump data, replace the removed band with fitting data, wherein the fitting data enables a smooth transition between the peak start point and the peak end point where the peak is removed in the inner end jump data.

[0099] Step S50' forms smooth thickness uniformity data by fitting the peak regions of the inner and outer end jump data respectively, making the data fitting more accurate and ensuring that the thickness uniformity data curve after fitting achieves a smooth transition between the inner and outer end jump data.

[0100] Compared with the prior art, this embodiment has the following beneficial effects:

[0101] (1) This method can effectively eliminate the impact of drilling on the data. By removing abnormal peaks in the hole data, it can more accurately present the thickness distribution and changes of the brake disc, help to more effectively evaluate the uniformity and performance of the brake disc, and improve the reliability of the thickness detection results.

[0102] (2) This method does not depend on how the data is obtained. Thickness detection data from different sources and in different formats can be used to eliminate the interference peaks caused by holes. In other words, this method has no special requirements for the data recording process and has high flexibility and wide adaptability, so that the measurement results can more truly reflect the actual thickness changes of the brake disc.

[0103] (3) This method does not affect the integrity of the outer-end jump data and the inner-end jump data in terms of the removal of the punctured data. The complete outer-end jump data and the inner-end jump data can also be applied to other analysis scenarios.

[0104] Therefore, under the premise of keeping the original data intact, this method makes thickness detection more flexible to adapt to different detection requirements and data formats without being disturbed by holes. Removing the influence of holes improves the reliability of thickness detection results and helps detection and production personnel to more accurately identify possible structural defects or uneven areas.

[0105] In one embodiment, a brake disc thickness testing device is provided. The brake disc thickness testing device includes modules, and the specific functions of each module are as follows:

[0106] An acquisition module, used for acquiring outer end jump data and inner end jump data, wherein the outer end jump data and the inner end jump data are data acquired at the outer side and the inner side of the brake disc respectively;

[0107] A calculation module, used for calculating thickness uniformity data according to the outer end jump data and the inner end jump data;

[0108] A peak determination module, used for determining all peaks in the thickness uniformity data, wherein the peak starting point of each peak is the rising edge of the data change, and the peak end point of each peak is the falling edge of the data change;

[0109] A screening module, used for screening all the peaks and retaining only the peaks that meet the hole screening condition, wherein the hole screening condition is that the difference between the peak value and the peak starting point is greater than a first preset value, or the difference between the peak value and the peak end point is greater than a second preset value;

[0110] A removal module is used to remove the retained peaks in the thickness uniformity data.

[0111] A displacement sensor, at least one displacement sensor is disposed on each side of the brake disc;

[0112] A storage module storing a computer program;

[0113] The processing module can implement the steps in the above-mentioned brake disc thickness testing method when executing the computer program.

[0114] It should be noted that for details not disclosed in the brake disc thickness testing device of the embodiment of the present invention, please refer to the details disclosed in the brake disc thickness testing method of the embodiment of the present invention.

[0115] The brake disc thickness test device may also include computing devices such as computers, notebooks, PDAs, and cloud servers, as well as including but not limited to a processing module, a storage module, and a computer program stored in the storage module and executable on the processing module, such as the above-mentioned brake disc thickness test method program. When the processing module executes the computer program, the steps in the above-mentioned brake disc thickness test method embodiments are implemented, such as Figure 2 and 9 Steps shown.

[0116] In addition, the present invention also proposes an electronic device, which includes a storage module and a processing module. When the processing module executes the computer program, it can implement the steps in the above-mentioned brake disc thickness testing method, that is, implement the steps in any one of the technical solutions in the above-mentioned brake disc thickness testing method.

[0117] The electronic device may be a part of a thickness testing device integrated into the brake disc, or a local terminal device, or a part of a cloud server.

[0118] The processing module can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor. The processing module is the control center of the brake disc thickness test equipment, and uses various interfaces and lines to connect the various parts of the entire brake disc thickness test equipment.

[0119] The storage module can be used to store the computer program and / or module, and the processing module realizes various functions of the brake disc thickness test device by running or executing the computer program and / or module stored in the storage module, and calling the data stored in the storage module. The storage module can mainly include a storage program area and a storage data area, wherein the storage program area can store an operating system, at least one application required for a function, etc. In addition, the storage module can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0120] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in a storage module and executed by a processing module to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program in a brake disc thickness testing device.

[0121] Furthermore, an embodiment of the present invention provides a readable storage medium storing a computer program, which, when executed by a processing module, can implement the steps in the above-mentioned brake disc thickness testing method, that is, implement the steps in any one of the technical solutions in the above-mentioned brake disc thickness testing method.

[0122] If the module integrated in the brake disc thickness test method is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing related hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processing module, the steps of each of the above-mentioned method embodiments can be implemented.

[0123] The computer program includes computer program code, which may be in source code form, object code form, executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, recording medium, disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer readable media do not include electric carrier signals and telecommunication signals.

[0124] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0125] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for testing the thickness of a brake disc, characterized in that: The steps include: Acquire outer end jump data and inner end jump data, wherein the outer end jump data and the inner end jump data are data acquired at the outer side and the inner side of the brake disc respectively; Calculating thickness uniformity data according to the outer end jump data and the inner end jump data; Determine all the peaks in the thickness uniformity data, wherein the peak starting point of each peak is the rising edge of the data change, and the peak end point of each peak is the falling edge of the data change; Screening all the peaks and retaining only the peaks that meet the hole screening condition, wherein the hole screening condition is that the difference between the peak value and the peak starting point is greater than a first preset value, or the difference between the peak value and the peak end point is greater than a second preset value; Remaining peaks in the thickness uniformity data are removed.

2. The brake disc thickness testing method according to claim 1, characterized in that: Also includes the steps: The outer-end jump data and the inner-end jump data are subjected to high-frequency filtering to reduce noise points in the outer-end jump data and the inner-end jump data.

3. The brake disc thickness testing method according to claim 1, characterized in that: The calculation method of the thickness uniformity data is: DTV[i]=(RunIn[i]+RunOut[i])-Min(RunIn+Runout), wherein DTV[i] is the thickness uniformity data, RunIn[i] is the inner end jump data, RunOut[i] is the outer end jump data, and Min(RunIn+Runout) is the sum of the minimum values ​​of the inner end jump data and the outer end jump data.

4. The brake disc thickness testing method according to claim 1, characterized in that: Also includes the steps: Replacing the position of the removed peak in the thickness uniformity data with the fitting data to obtain corrected thickness uniformity data; The corrected thickness uniformity data is subjected to order analysis by Fourier transform.

5. The brake disc thickness testing method according to claim 4, characterized in that: The fitting data is calculated by interpolation method to make a smooth transition between the peak starting point and the peak end point where the peak is removed.

6. The brake disc thickness testing method according to claim 5, characterized in that: The calculation method of the fitting data is: taking the difference between the amplitude of the peak end point and the amplitude of the peak starting point, and the quotient of the number of points between the peak end point and the peak starting point as an increasing term, and the amplitude of the position of each point between the peak end point and the peak starting point increases successively according to the increasing term.

7. A method for testing the thickness of a brake disc, characterized in that: The steps include: Acquire outer end jump data and inner end jump data, wherein the outer end jump data and the inner end jump data are data acquired at the outer side and the inner side of the brake disc respectively; Determine all the peaks in the outer-end jump data and / or the inner-end jump data, wherein the peak starting point of each peak is the rising edge of the data change, and the peak end point of each peak is the falling edge of the data change; Screening all the peaks and retaining only the peaks that meet the hole screening condition, wherein the hole screening condition is that the difference between the peak value and the peak starting point is greater than a first preset value, or the difference between the peak value and the peak end point is greater than a second preset value; Using the peak start point and the peak end point of the filtered peak as indexes, removing the wave band between the corresponding peak start point and the peak end point in the outer end jump data and the inner end jump data; Thickness uniformity data is calculated based on the outer end jump data and the inner end jump data.

8. The brake disc thickness testing method according to claim 7, characterized in that: The removing of the wave band between the wave peak starting point and the wave peak ending point corresponding to the outer end jump data and the inner end jump data comprises: After the wave band between the corresponding wave peak starting point and wave peak end point in the outer end jump data is removed, the removed wave band is replaced with fitting data, wherein the fitting data enables a smooth transition between the wave peak starting point and the wave peak end point where the wave peak in the outer end jump data is removed; After the band between the corresponding peak start point and peak end point in the inner end jump data is removed, the removed band is replaced with fitting data, wherein the fitting data enables a smooth transition between the peak start point and the peak end point where the peak in the inner end jump data is removed.

9. A brake disc thickness testing device, characterized in that: include: A displacement sensor, at least one displacement sensor is disposed on each side of the brake disc; A storage module storing a computer program; The processing module can implement the steps of the brake disc thickness testing method according to any one of claims 1 to 8 when executing the computer program.

10. A readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processing module, the steps in the brake disc thickness testing method according to any one of claims 1 to 8 can be implemented.

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