Parameter determination method of flexible support and related device

Abstract

The invention provides a parameter determination method of a flexible support and a related device, and relates to the photovoltaic field. In the application, after the excitation force is applied to the preset excitation position in the flexible bracket, the flexible bracket freely vibrates according to the inherent frequency, and the damping influence and the free vibration are continuously attenuated in the vibration process of the flexible bracket, so that the inherent frequency and the damping can be calculated by using the time history data during the free vibration of the flexible bracket; the problem that parameters of the flexible support need to be determined urgently is solved.

Description

Technical Field

[0001] The present application relates to the photovoltaic field, and more specifically, to a method for determining parameters of a flexible bracket and related devices. Background Art

[0002] The photovoltaic industry has been booming in recent years, and flexible brackets have been continuously recognized by customers for their large span, small footprint, low cost, and strong terrain adaptability.

[0003] The support system of the flexible bracket is a cable structure, which is prone to large deformation and vibration under wind load. Studying its dynamic response under wind load is helpful to improve its structure and ensure the overall stability of the structure. In dynamic response analysis, some parameters of the flexible bracket, such as natural frequency and damping, are very important in transient dynamic analysis. A higher natural frequency means a greater structural stiffness, and a higher damping ratio means a higher stability under dynamic load. How to determine these parameters is a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0004] In view of this, the present application provides a method for determining parameters of a flexible bracket and a related device to solve the problem of urgently needing to determine the parameters of the flexible bracket.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

[0006] A method for determining parameters of a flexible support, comprising:

[0007] After applying an exciting force to a preset excitation position in the flexible support, obtaining time history data of the flexible support during free vibration;

[0008] Performing a preset data processing operation corresponding to the flexible stent parameters on the time course data to obtain data to be analyzed;

[0009] The parameter values ​​of the flexible support parameters are calculated using the data to be analyzed.

[0010] Optionally, applying an exciting force to a preset excitation position in the flexible support includes:

[0011] Construct a simulation model of a flexible bracket;

[0012] Determining a modal analysis result of the flexible bracket simulation model;

[0013] Based on the modal analysis results, determining a preset excitation position in the flexible support;

[0014] Apply an exciting force to the preset excitation position.

[0015] Optionally, the modal analysis result includes a theoretical natural frequency and a vibration mode corresponding to the theoretical natural frequency;

[0016] Determining a preset excitation position in the flexible support based on the modal analysis result includes:

[0017] Each preset low-order theoretical natural frequency to be analyzed is used as a reference frequency;

[0018] Determine, based on the vibration mode corresponding to the reference frequency in the modal analysis result, a target position in the flexible bracket where the acceleration changes most dramatically;

[0019] A target peripheral position corresponding to the target position is determined, and the target peripheral position is used as a preset excitation position.

[0020] Optionally, applying an exciting force to the preset excitation position includes:

[0021] Determine an exciting force application mode corresponding to the reference frequency, wherein the exciting force application mode includes frequency and amplitude;

[0022] The excitation tool is used to apply the excitation force at the preset excitation position according to the excitation force applying method.

[0023] Optionally, obtaining time history data of the flexible support during free vibration includes:

[0024] The time history data of the flexible bracket during free vibration collected by the acceleration sensor arranged at the target position is obtained.

[0025] Optionally, the flexible support parameters include actual natural frequency;

[0026] Performing a preset data processing operation corresponding to the flexible stent parameters on the time course data to obtain data to be analyzed includes:

[0027] The time course data is converted into frequency domain data, and the frequency domain data is used as data to be analyzed.

[0028] Optionally, calculating the parameter value of the flexible stent parameter using the data to be analyzed includes:

[0029] A filtering operation is performed on the frequency domain data to obtain an actual natural frequency corresponding to the reference frequency.

[0030] Optionally, the flexible support parameters include damping;

[0031] Performing a preset data processing operation corresponding to the flexible stent parameters on the time course data to obtain data to be analyzed includes:

[0032] The time course data is filtered to obtain data to be analyzed.

[0033] Optionally, calculating the parameter value of the flexible stent parameter using the data to be analyzed includes:

[0034] Calculating the attenuation ratio of the flexible bracket during the free vibration attenuation process according to the data to be analyzed;

[0035] The damping corresponding to the attenuation ratio is calculated.

[0036] A device for determining parameters of a flexible support, comprising:

[0037] A data acquisition module, used for acquiring time history data of the flexible support during free vibration after applying an exciting force to a preset excitation position in the flexible support;

[0038] A data processing module, used to perform a preset data processing operation corresponding to the flexible stent parameters on the time course data to obtain data to be analyzed;

[0039] The parameter calculation module is used to calculate the parameter values ​​of the flexible bracket parameters using the data to be analyzed.

[0040] An electronic device comprises at least one processor and a memory connected to the processor, wherein:

[0041] The memory is used to store computer programs;

[0042] The processor is used to execute the computer program so that the electronic device can implement the above-mentioned method for determining parameters of the flexible bracket.

[0043] A parameter determination system for a flexible support includes the above-mentioned electronic device, and further includes: an exciting force applying device and a frequency acquisition device;

[0044] The excitation force applying device is used to apply an excitation force to a preset excitation position in the flexible bracket based on the control of the electronic device;

[0045] The frequency acquisition device is used to collect time course data of the flexible bracket during free vibration, and send the time course data to the electronic device.

[0046] Optionally, when the excitation force applying device is used to apply the excitation force to a preset excitation position in the flexible bracket based on the control of the electronic device, it is specifically used to:

[0047] receiving an exciting force application method determined by the electronic device;

[0048] At the preset excitation position, an excitation force is applied according to the excitation force applying method.

[0049] Optionally, the frequency acquisition device includes:

[0050] An acceleration sensor arranged at a specific position of the bracket, a transmitter connected to the sensor, and a data collector for receiving signals;

[0051] The acceleration sensor is used to collect time-course data of the flexible bracket during free vibration, and send the time-course data to the electronic device through the transmitter and the data collector.

[0052] A computer storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement the above-mentioned method for determining parameters of a flexible bracket.

[0053] The present application provides a method for determining parameters of a flexible bracket and a related device. In the present application, after an exciting force is applied to a preset excitation position in the flexible bracket, the flexible bracket vibrates freely at a natural frequency, and during the vibration of the flexible bracket, the free vibration will continue to decay due to the influence of damping. Therefore, the time history data of the flexible bracket during free vibration can be used to calculate the natural frequency and damping, thereby solving the problem of urgently needing to determine the parameters of the flexible bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0055] Figure 1 A flow chart of a method for determining parameters of a flexible bracket provided in an embodiment of the present application;

[0056] Figure 2 A flow chart of a method for applying an exciting force provided in an embodiment of the present application;

[0057] Figure 3 An example diagram of a flexible bracket simulation model corresponding to a flexible bracket provided in an embodiment of the present application;

[0058] Figure 4 A first-order overall undulating vibration modal diagram of a flexible bracket provided in an embodiment of the present application;

[0059] Figure 5 A modal diagram of intersegmental torsional vibration of a flexible stent provided in an embodiment of the present application;

[0060] Figure 6A schematic diagram of the arrangement position of acceleration sensors when a flexible bracket as a whole fluctuates and vibrates provided in an embodiment of the present application;

[0061] Figure 7 A schematic diagram of the arrangement position of acceleration sensors during torsional vibration of a flexible bracket provided in an embodiment of the present application;

[0062] Figure 8 A schematic diagram of the structure of a device for determining parameters of a flexible support provided in an embodiment of the present application;

[0063] Fig. 9 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0064] Fig.10 A schematic diagram of the structure of a parameter determination system for a flexible bracket provided in an embodiment of the present application. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0066] The photovoltaic industry has been booming in recent years, and flexible brackets have been continuously recognized by customers for their large span, small footprint, low cost, and strong terrain adaptability.

[0067] The support system of the flexible bracket is a cable structure, which is prone to large deformation and vibration under wind load. Studying its dynamic response under wind load is helpful to improve its structure and ensure the overall stability of the structure. In the dynamic response analysis, some parameters of the flexible bracket, such as natural frequency and damping, are very important in transient dynamic analysis.

[0068] Among them, higher natural frequency means greater structural stiffness, and higher damping means higher stability under dynamic load. Therefore, the natural frequency and damping test method of flexible brackets are worth studying.

[0069] In the related scheme, the natural frequency of the flexible bracket is determined by the resonance phenomenon, but in reality, the resonance frequency is the external excitation frequency, and the natural frequency is the inherent property of the structure. Resonance does not necessarily occur only at a single natural frequency, but often occurs in a resonance band with a certain frequency range. Therefore, this method regards the resonance frequency as equivalent to the natural frequency of the bracket, which has a certain error. At the same time, in the related technology, there is a lack of damping test methods in the dynamic test methods of flexible brackets.

[0070] Therefore, how to accurately determine the natural frequency and / or damping under wind load is a technical problem that technical personnel in this field need to solve urgently.

[0071] In the embodiment of the present application, after applying an exciting force to a preset excitation position in the flexible bracket, the flexible bracket vibrates freely at a natural frequency. Therefore, the natural frequency can be determined using the time history data of the free vibration. In addition, during the vibration of the flexible bracket, the free vibration will continue to decay due to the influence of damping. Therefore, the damping can also be calculated using the time history data of the free vibration of the flexible bracket. In the present application, since the free vibration process of the flexible bracket is analyzed, the natural frequency and damping are directly calculated, and the resonance frequency is no longer regarded as the natural frequency of the bracket. The obtained natural frequency and damping are in line with the actual situation of the flexible bracket, and the test accuracy is higher.

[0072] Based on the above content, an embodiment of the present application provides a method for determining parameters of a flexible bracket, and the execution subject may be a controller, a processor, a server, etc. For example, in a photovoltaic scene, a photovoltaic controller may be used to execute a method for determining parameters of a flexible bracket in an embodiment of the present application.

[0073] Reference Figure 1 , a method for determining parameters of a flexible stent may include:

[0074] S11. After applying an exciting force to a preset excitation position in the flexible support, obtaining time history data of the flexible support during free vibration.

[0075] The flexible bracket in the embodiment of the present application refers to a flexible bracket whose supporting system is a cable structure used in photovoltaic scenarios.

[0076] Since the natural frequency and damping required to be calculated in this application are related to the free vibration of the flexible bracket, it is necessary to apply an exciting force to the flexible bracket to make the flexible bracket vibrate freely. During the free vibration process, the flexible bracket generates a vibration response at the natural frequency. During the vibration process, a frequency acquisition device can be used to collect time history data of the flexible bracket during free vibration.

[0077] S12, performing a preset data processing operation corresponding to the flexible support parameters on the time course data to obtain data to be analyzed.

[0078] In this embodiment, the preset bracket parameters are parameters required to be calculated in the embodiment of the present application, including at least one of the natural frequency and damping, and can be specifically configured according to actual needs.

[0079] Different preset bracket parameters correspond to different preset data processing operations. For example, the preset data processing operation corresponding to the natural frequency includes a time domain to frequency domain conversion operation, and the preset data processing operation corresponding to the damping is a filtering operation.

[0080] S13. Calculate parameter values ​​of the flexible support parameters using the data to be analyzed.

[0081] In this embodiment, after the data to be analyzed is obtained, the execution process of step S13 is different according to different preset bracket parameters.

[0082] In this embodiment, after applying an exciting force to a preset excitation position in the flexible bracket, the flexible bracket vibrates freely at a natural frequency, and during the vibration of the flexible bracket, the free vibration will continue to decay due to the influence of damping. Therefore, the time history data of the flexible bracket during free vibration can be used to calculate the natural frequency and damping, thereby solving the problem of urgently needing to determine the parameters of the flexible bracket.

[0083] The above embodiment mentioned that an exciting force is applied to a preset excitation position in the flexible bracket, and this embodiment introduces its specific implementation. Figure 2 , which may include:

[0084] S21. Construct a flexible bracket simulation model.

[0085] In practical applications, since the structure of the flexible bracket is relatively large, when applying the exciting force to the flexible bracket, it is necessary to determine the application position of the exciting force. In this embodiment, the application position is called the preset excitation position, which can be determined in advance.

[0086] When determining the preset excitation position, the vibration condition of the flexible bracket when excited can be obtained through model simulation, so as to find the position where the acceleration changes most dramatically. Since the position changes dramatically, the time history data of this position can be easily collected, and then the time history data can be used to perform parameter calculation operations.

[0087] When conducting model simulation, it is necessary to first build a simulation model of the flexible bracket. Specifically, the modeling is completed in the calculation software according to the actual design information. During the modeling, the size, cross-section, material and connection relationship between components of all components in the flexible bracket must be consistent with the actual situation. Figure 3 This is an example diagram of a flexible bracket simulation model corresponding to a certain flexible bracket.

[0088] S22. Determine the modal analysis result of the flexible bracket simulation model.

[0089] In practical applications, since different natural frequencies of the flexible bracket have different vibration modes during vibration, when applying the exciting force later, it is necessary to select the corresponding preset excitation position according to the different vibration modes. Therefore, it is necessary to determine the natural frequencies of the flexible bracket and the vibration modes corresponding to the natural frequencies.

[0090] At this point, the natural frequencies of the flexible bracket and the vibration modes corresponding to the natural frequencies can be determined according to the modal analysis method. For example, the vibration mode corresponding to the first-order overall undulating vibration natural frequency is the overall undulating vibration, and the vibration mode corresponding to the internode torsional vibration natural frequency is the torsional vibration...

[0091] It should be noted that in the embodiment of the present application, since the flexible bracket is modeled and simulated, the natural frequencies of the flexible bracket simulation model and the vibration modes corresponding to the natural frequencies are obtained. Since the flexible bracket simulation model is a standardized model, and since the flexible bracket is often used and there are problems such as deformation and damage, there are slight differences between the flexible bracket in the actual application scenario and the model, which makes the natural frequencies corresponding to the flexible bracket simulation model and the natural frequencies of the flexible bracket in the actual scenario slightly different. Therefore, the natural frequencies corresponding to the flexible bracket simulation model are called theoretical natural frequencies, and the natural frequencies of the flexible bracket in the actual scenario are called actual natural frequencies. The modal analysis method is used to process the flexible bracket simulation model, and the modal analysis results obtained include the theoretical natural frequencies and the vibration modes corresponding to the theoretical natural frequencies.

[0092] Among them, the modal analysis method is a method to study the dynamic characteristics of the structure. The mode refers to the natural vibration characteristics of the mechanical structure. Each mode has a specific natural frequency, damping ratio and modal vibration shape. By analyzing these modal parameters, the vibration response of the structure under the action of external or internal vibration sources can be understood.

[0093] After obtaining the modal analysis results, when analyzing the theoretical natural frequency, although the continuous elastic body has infinite natural frequencies in theory, usually only the low-order natural frequencies are concerned. This is because the lower the natural frequency, the easier it is to be excited by the outside world. Figure 4 This is the first-order overall undulation vibration modal diagram of the flexible bracket.

[0094] At the same time, the torsional vibration frequency between the flexible stent nodes is also worthy of attention. Figure 5 This is the modal diagram of the internode torsional vibration of the flexible bracket. A low internode torsional vibration frequency means that internode torsional aerodynamic instability of the flexible bracket is likely to occur. At this time, the arrangement spacing of the inter-row supports of the flexible bracket should be appropriately reduced; conversely, if the internode torsional vibration frequency is high, the arrangement spacing of the inter-row supports can be appropriately increased.

[0095] S23. Determine a preset excitation position in the flexible bracket based on the modal analysis result.

[0096] Specifically, the preset excitation position in this embodiment is the position where the exciting force needs to be applied, and the specific determination process may include:

[0097] 1) Each preset low-order theoretical natural frequency to be analyzed is used as the reference frequency.

[0098] Specifically, in this embodiment, according to the above discussion, the two situations of the first-order overall fluctuation vibration natural frequency and the inter-node torsional vibration natural frequency are mainly considered. Both frequencies are preset low-order theoretical natural frequencies. In the subsequent analysis, the first-order overall fluctuation vibration natural frequency and the inter-node torsional vibration natural frequency are respectively used as reference frequencies to perform subsequent preset excitation position determination operations.

[0099] 2) Based on the vibration mode corresponding to the reference frequency in the modal analysis result, determine the target position of the flexible bracket where the acceleration changes most dramatically.

[0100] Specifically, the vibration mode corresponding to the natural frequency of the first-order overall fluctuation vibration is the overall fluctuation vibration, and the vibration mode corresponding to the natural frequency of the inter-node torsional vibration is the torsional vibration. That is, different frequencies correspond to different vibration modes, and the target position with the most drastic acceleration change is also different, and needs to be determined separately.

[0101] When the reference frequency is the first-order natural frequency of the overall fluctuation vibration, Figure 4 It can be seen that at this time, the external excitation force will stimulate the flexible bracket to perform overall undulating vibration. In order to better monitor the vibration time history, the acceleration sensor that collects time history data should be arranged at the target position where the acceleration changes most violently, that is, Figure 6 Midpoint A.

[0102] Subsequent external excitation force can be applied manually or by an excitation tool. Manual excitation force application is more convenient, and the excitation tool can control the frequency and amplitude of the excitation force application more accurately. The tester can choose the corresponding manual excitation or excitation tool according to the test purpose. Depending on the vibration mode of the flexible bracket, the layout position of the acceleration sensor and the position and method of applying the external excitation force are also different. The flexible bracket is forced to vibrate by artificial or tool excitation, and the external excitation force is removed after a period of time, and the flexible bracket vibrates freely at the natural frequency. Figure 6 As shown, when artificial excitation is used, the adjacent component panels / cables of point A can be shaken up and down to perform up and down vibration excitation. The same is true when tooling excitation is used.

[0103] When the reference frequency is the natural frequency of internode torsional vibration, Figure 5 It can be seen that at this time, the external excitation force will stimulate the flexible bracket to perform internode torsional vibration. In order to better monitor the vibration time course, the acceleration sensor should be arranged at the target position where the acceleration changes most violently, that is, Figure 7 Midpoint B or point C. When artificial excitation is used, torsional vibration excitation can be performed by shaking both sides of the adjacent component panels at point B or point C. The same is true when tooling excitation is used.

[0104] 3) Determine the target peripheral position corresponding to the target position, and use the target peripheral position as the preset excitation position.

[0105] Specifically, when the reference frequency is the first-order overall undulating vibration natural frequency, the component panel / cable adjacent to the target position (point A) is the target peripheral position in the embodiment of the present application.

[0106] When the reference frequency is the natural frequency of inter-node torsional vibration, the two sides of the adjacent component panels of the target position (point B or point C) are the target peripheral positions in the embodiment of the present application.

[0107] The target peripheral position determined above is the preset excitation position in the embodiment of the present application, that is, the exciting force is applied from this position.

[0108] S24, applying an exciting force to the preset excitation position.

[0109] In practical applications, the location and method of applying external exciting force are different due to the different vibration modes of the flexible bracket.

[0110] When analyzing the first-order overall heaving vibration natural frequency, the panel / cable of the adjacent component at point A can be shaken up and down manually or with an excitation tool to perform heaving vibration excitation. When applying the excitation force manually, it is determined based on manual experience. When using an excitation tool, the excitation force application frequency and amplitude control of the excitation tool are more precise. Therefore, in scenarios with high accuracy requirements, the excitation tool can be used to achieve the application of the excitation force. In scenarios with low cost requirements, a low-cost method can be selected to achieve the application of the excitation force.

[0111] When using an excitation tool to apply an excitation force, it is necessary to determine an excitation force application method corresponding to a reference frequency, where the excitation force application method includes a frequency and an amplitude.

[0112] Specifically, the frequencies and amplitudes corresponding to the first-order overall heaving vibration natural frequency and the inter-node torsional vibration natural frequency can be determined based on experience or data statistics, and the data can be stored in a database for direct access when needed later.

[0113] After determining the exciting force application method, the exciting force is applied at the preset excitation position by using an exciting tool according to the exciting force application method.

[0114] When the reference frequency is the natural frequency of internode torsional vibration, when artificial excitation is used, torsional vibration excitation can be performed by shaking the two sides of the adjacent component panels at point B or point C. The same is true when tooling excitation is used. The implementation process of tooling excitation refers to the corresponding content above.

[0115] In actual scenarios, the natural frequency of the flexible support structure is only affected by the stiffness distribution and mass distribution. When there is no external load excitation, the natural frequency exists objectively. When there is external load excitation, the structure produces a vibration response according to the natural frequency. It should be noted that the excitation force applied in the embodiment of the present application is to operate the flexible support in the actual scenario, and the structure of the flexible support is the same as the above-mentioned flexible support simulation model.

[0116] During the excitation process, the flexible bracket will vibrate freely according to the natural frequency. At this time, it is necessary to collect time-course data. During the collection, a frequency collection device can be used to perform data collection operations.

[0117] The frequency acquisition device includes an acceleration sensor arranged at a specific position of the bracket, a transmitter connected to the sensor, and a data collector for receiving signals. The data collector can communicate with a device for executing the parameter determination method of the flexible bracket, thereby sending the time course data collected by the acceleration sensor to the device.

[0118] According to the different vibration modes of the flexible bracket, the acceleration sensor is arranged at different positions. For example, in the case of overall undulating vibration, that is, when the reference frequency is the first-order overall undulating vibration natural frequency, the acceleration sensor is set at the above-mentioned point A, and in the case of torsional vibration, that is, when the reference frequency is the internode torsional vibration natural frequency, the acceleration sensor is set at the above-mentioned point B or point C. Among them, point A, point B or point C is the target position in the embodiment of the present application. The acceleration can continuously collect time-course data according to the vibration of the flexible bracket, and the device that subsequently executes the parameter determination method of the flexible bracket obtains the time-course data of the flexible bracket during free vibration collected by the acceleration sensor set at the target position. Among them, the time-course data collected by the acceleration sensor refers to a series of data points arranged in chronological order, and these data points reflect the state or performance of a variable or process at different time points. The time-course data in this application is time domain data.

[0119] The device for executing the method for determining the parameters of the flexible bracket and the data collector in the frequency acquisition device can communicate in a wired or wireless manner. During the communication process, for the sake of communication reliability, the data can be transmitted in an encrypted manner.

[0120] In the embodiments of the present application, the acceleration sensor arrangement position and the external exciting force application position and method are different according to the different vibration modes of the flexible bracket, which can better match the actual scene. In different scenes, appropriate methods are used for excitation to improve the accuracy of the subsequent collected time-course data.

[0121] In another implementation of the present application, when the contents of the flexible bracket parameters are different, the process of calculating the parameter values ​​is also different, which are now introduced separately.

[0122] 1. The flexible support parameters include actual natural frequency.

[0123] When the actual natural frequency needs to be calculated, when a preset data processing operation corresponding to the flexible support parameters is performed on the time history data, the time history data can be converted into frequency domain data, and the frequency domain data can be used as data to be analyzed.

[0124] Specifically, in the process of the flexible bracket vibrating according to the natural frequency, the collected time history data is a response frequency to the speed and displacement of the vibration. The response frequency includes multiple natural frequencies of different orders, that is, the response frequency is composed of a combination of multiple natural frequencies of different orders. After converting the time domain time history data into frequency domain data, the actual natural frequency corresponding to the reference frequency can be screened out from the frequency domain data.

[0125] When screening, a filtering operation may be performed on the frequency domain data to obtain an actual natural frequency corresponding to the reference frequency.

[0126] In practical applications, the acceleration time domain data of the monitoring point when the flexible bracket is in free vibration, collected by the acceleration sensor, is converted into frequency domain data through Fourier transform, and filtered using a Butterworth low-pass filter to eliminate the interference of useless signals (natural frequencies corresponding to other vibration modes), and the actual natural frequency corresponding to the reference frequency of the flexible bracket is obtained.

[0127] In specific implementation, since the reference frequency includes the first-order natural frequency of the overall heaving vibration and the natural frequency of the internode torsional vibration, the time history data corresponding to these two frequencies can be Fourier transformed and filtered respectively to obtain the natural frequencies corresponding to the overall heaving vibration and the internode torsional vibration.

[0128] After obtaining the actual natural frequencies corresponding to the overall heaving vibration and internode torsional vibration, since the theoretical natural frequencies of the flexible bracket simulation model are obtained by modal analysis, the actual natural frequencies can be compared with the theoretical natural frequencies. If the two are consistent, it means that the actual natural frequencies obtained by actual calculation are correct. If they are inconsistent, it means that there is a calculation error or a construction error in the installation process.

[0129] 2. The flexible support parameters include damping.

[0130] In this embodiment, when a preset data processing operation corresponding to the flexible support parameters is performed on the time course data to obtain the data to be analyzed, filtering processing may be performed on the time course data to obtain the data to be analyzed.

[0131] Specifically, the acceleration time domain data of the monitoring points when the flexible bracket is in free vibration, which is collected by the acceleration sensor, is filtered to remove impurities.

[0132] Then, according to the data to be analyzed, the attenuation ratio of the flexible bracket during the free vibration attenuation process is calculated, and the damping corresponding to the attenuation ratio is calculated.

[0133] Specifically, the logarithmic attenuation method can be used to obtain the damping corresponding to the overall heaving vibration and internode torsional vibration of the flexible support. The system decays in an exponential form during free vibration. The logarithmic attenuation method can be used to obtain the attenuation rate of the system's free vibration attenuation process, and then the system damping ratio can be obtained. The logarithmic attenuation method has a lower error when the damping is small, and is suitable for flexible support systems. It is reasonable to apply the logarithmic attenuation method to the damping test of the flexible support.

[0134] Similarly, for the first-order natural frequency of the overall heaving vibration and the natural frequency of the internode torsional vibration, the damping corresponding to the overall heaving vibration and the internode torsional vibration of the flexible bracket are calculated respectively.

[0135] In this embodiment, the flexible bracket is forced to vibrate by artificial or tooling excitation, and the external exciting force is removed after a period of time, and the flexible bracket vibrates freely at the natural frequency. At this time, the time course data of the flexible bracket during free vibration is collected by the frequency acquisition device, and the time domain data is converted into frequency domain data by Fourier transform, and a Butterworth low-pass filter is applied to filter to eliminate the interference of useless signals (natural frequencies corresponding to other vibration modes), and the vibration frequency corresponding to the corresponding vibration form of the flexible bracket is obtained. In this application, the resonant frequency is no longer regarded as the equivalent of the bracket natural frequency, which is more accurate than the existing photovoltaic bracket natural frequency test method.

[0136] In addition, this application uses the logarithmic attenuation method to process the vibration time-history data of the monitoring point to obtain the damping corresponding to the overall heaving vibration and internode torsional vibration of the flexible bracket, and creatively applies the logarithmic attenuation method to the damping ratio test of the flexible bracket, filling the gap in the current flexible bracket damping test method.

[0137] Based on the above-mentioned embodiment of the method for determining parameters of a flexible support, another embodiment of the present application provides a device for determining parameters of a flexible support, referring to Figure 8 , which may include:

[0138] The data acquisition module 11 is used to acquire the time history data of the free vibration of the flexible support after applying the exciting force to the preset exciting position in the flexible support;

[0139] A data processing module 12, configured to perform a preset data processing operation corresponding to the flexible stent parameters on the time course data to obtain data to be analyzed;

[0140] The parameter calculation module 13 is used to calculate the parameter values ​​of the flexible bracket parameters using the data to be analyzed.

[0141] In one implementation, the data acquisition module 11 includes:

[0142] A model building submodule is used to build a simulation model of a flexible bracket;

[0143] A modal analysis submodule, used to determine the modal analysis result of the flexible bracket simulation model;

[0144] A position determination submodule, used to determine a preset excitation position in the flexible bracket based on the modal analysis result;

[0145] The exciting force applying submodule is used to apply the exciting force to the preset excitation position.

[0146] In one implementation, the modal analysis results include theoretical natural frequencies and vibration modes corresponding to the theoretical natural frequencies;

[0147] The position determination submodule comprises:

[0148] A frequency determination unit, used for taking each preset low-order theoretical natural frequency to be analyzed as a reference frequency;

[0149] A first position determination unit, configured to determine a target position in the flexible bracket where the acceleration changes most dramatically based on a vibration mode corresponding to the reference frequency in the modal analysis result;

[0150] The second position determination unit is used to determine the target peripheral position corresponding to the target position, and use the target peripheral position as the preset excitation position.

[0151] In one implementation, the exciting force applying submodule is specifically used for:

[0152] Determine an exciting force application mode corresponding to the reference frequency, wherein the exciting force application mode includes frequency and amplitude, and apply the exciting force at the preset excitation position using an exciting tool according to the exciting force application mode.

[0153] In one implementation, the data acquisition module 11 includes:

[0154] The data acquisition submodule is used to acquire the time history data of the flexible bracket during free vibration collected by the acceleration sensor arranged at the target position.

[0155] In one implementation, the flexible support parameters include actual natural frequency; the data processing module 12 includes:

[0156] The data conversion submodule is used to convert the time-course data into frequency-domain data, and use the frequency-domain data as data to be analyzed.

[0157] In one implementation, the parameter calculation module 13 includes:

[0158] The first filtering submodule is used to perform a filtering operation on the frequency domain data to obtain an actual natural frequency corresponding to the reference frequency.

[0159] In one implementation, the flexible support parameter includes damping; the data processing module 12 includes:

[0160] The second filtering submodule is used to filter the time course data to obtain data to be analyzed.

[0161] In one implementation, the parameter calculation module 13 includes:

[0162] An attenuation ratio calculation submodule, used to calculate the attenuation ratio of the flexible support during the free vibration attenuation process according to the data to be analyzed;

[0163] The damping calculation submodule is used to calculate the damping corresponding to the attenuation ratio.

[0164] In this embodiment, after applying an exciting force to a preset excitation position in the flexible bracket, the flexible bracket vibrates freely at a natural frequency, and during the vibration of the flexible bracket, the free vibration will continue to decay due to the influence of damping. Therefore, the time history data of the flexible bracket during free vibration can be used to calculate the natural frequency and damping, thereby solving the problem of urgently needing to determine the parameters of the flexible bracket.

[0165] It should be noted that, for the working process of each module, sub-module and unit in this embodiment, please refer to the corresponding description in the above embodiment, which will not be repeated here.

[0166] Another embodiment of the present application provides an electronic device, comprising at least one processor and a memory connected to the processor, wherein:

[0167] The memory is used to store computer programs;

[0168] The processor is used to execute the computer program so that the electronic device can implement the above-mentioned method for determining parameters of the flexible bracket.

[0169] refer to Fig. 9 As shown, it shows a schematic diagram of the structure of an electronic device suitable for implementing the embodiment of the present application. The electronic device in the embodiment of the present application may include but is not limited to fixed terminals such as controllers, processors, servers, mobile phones, notebook computers, PDAs (personal digital assistants), PADs (tablet computers), desktop computers, etc. Fig. 9 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0170] like Fig. 9As shown, the electronic device may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage device 608 to a random access memory (RAM) 603. When the electronic device is powered on, various programs and data required for the operation of the electronic device are also stored in the RAM 603. The processing device 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0171] Typically, the following devices may be connected to the I / O interface 605: an input device 606 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 607 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 608 including, for example, a memory card, a hard disk, etc.; and a communication device 609. The communication device 609 may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. Although Fig. 9 An electronic device having various devices is shown, but it should be understood that it is not required to implement or possess all the devices shown. More or fewer devices may be implemented or possessed instead.

[0172] The present application also provides a parameter determination system for a flexible bracket, referring to Fig.10 , including an electronic device 21 for executing the above-mentioned method for determining the parameters of the flexible bracket, and also including: an excitation force applying device 22 and a frequency acquisition device 23. Among them, the excitation force applying device 22 can be implemented by the above-mentioned excitation tooling.

[0173] The excitation force applying device 22 is used to apply an excitation force to a preset excitation position in the flexible bracket based on the control of the electronic device 21;

[0174] The frequency acquisition device 23 is used to collect time course data of the flexible bracket during free vibration, and send the time course data to the electronic device.

[0175] Furthermore, when the excitation force applying device is used to apply the excitation force to the preset excitation position in the flexible bracket based on the control of the electronic device, it is specifically used to:

[0176] receiving an exciting force application method determined by the electronic device;

[0177] At the preset excitation position, an excitation force is applied according to the excitation force applying method.

[0178] Furthermore, the frequency acquisition device comprises:

[0179] An acceleration sensor arranged at a specific position of the bracket, a transmitter connected to the sensor, and a data collector for receiving signals;

[0180] The acceleration sensor is used to collect time-course data of the flexible bracket during free vibration, and send the time-course data to the electronic device through the transmitter and the data collector.

[0181] It should be noted that, for the specific implementation of the electronic device, the exciting force applying device and the frequency acquisition device in this embodiment, please refer to the corresponding description in the above embodiments, which will not be repeated here.

[0182] An embodiment of the present application also provides a computer program product including computer-readable instructions. When the computer-readable instructions are executed on an electronic device, the electronic device implements any method for determining parameters of a flexible bracket provided in the embodiment of the present application.

[0183] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any method for determining parameters of a flexible bracket provided in an embodiment of the present application.

[0184] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for determining parameters of a flexible support, characterized in that: include: After applying an exciting force to a preset excitation position in the flexible support, obtaining time history data of the flexible support during free vibration; Performing a preset data processing operation corresponding to the flexible stent parameters on the time course data to obtain data to be analyzed; The parameter values ​​of the flexible support parameters are calculated using the data to be analyzed.

2. The method for determining parameters of a flexible support according to claim 1, characterized in that: Apply exciting force to the preset excitation position in the flexible bracket, including: Construct a simulation model of a flexible bracket; Determining a modal analysis result of the flexible bracket simulation model; Based on the modal analysis results, determining a preset excitation position in the flexible support; Applying an exciting force to the preset excitation position.

3. The method for determining parameters of a flexible support according to claim 2, characterized in that: The modal analysis results include theoretical natural frequencies and vibration modes corresponding to the theoretical natural frequencies; Determining a preset excitation position in the flexible support based on the modal analysis result includes: Each preset low-order theoretical natural frequency to be analyzed is used as a reference frequency; Determine, based on the vibration mode corresponding to the reference frequency in the modal analysis result, a target position in the flexible bracket where the acceleration changes most dramatically; A target peripheral position corresponding to the target position is determined, and the target peripheral position is used as a preset excitation position.

4. The method for determining parameters of a flexible support according to claim 3, characterized in that: Applying an exciting force to the preset excitation position includes: Determine an exciting force application mode corresponding to the reference frequency, wherein the exciting force application mode includes frequency and amplitude; The excitation tool is used to apply the excitation force at the preset excitation position according to the excitation force applying method.

5. The method for determining parameters of a flexible support according to claim 3, characterized in that: Obtain time history data of the flexible support during free vibration, including: The time history data of the flexible bracket during free vibration collected by the acceleration sensor arranged at the target position is obtained.

6. The method for determining parameters of a flexible support according to claim 3, characterized in that: The flexible support parameters include actual natural frequency; Performing a preset data processing operation corresponding to the flexible stent parameters on the time course data to obtain data to be analyzed includes: The time course data is converted into frequency domain data, and the frequency domain data is used as data to be analyzed.

7. The method for determining parameters of a flexible support according to claim 6, characterized in that: Calculating the parameter values ​​of the flexible support parameters using the data to be analyzed includes: A filtering operation is performed on the frequency domain data to obtain an actual natural frequency corresponding to the reference frequency.

8. The method for determining parameters of a flexible support according to claim 1, characterized in that: The flexible support parameters include damping; Performing a preset data processing operation corresponding to the flexible stent parameters on the time course data to obtain data to be analyzed includes: The time course data is filtered to obtain data to be analyzed.

9. The method for determining parameters of a flexible support according to claim 8, characterized in that: Calculating the parameter values ​​of the flexible support parameters using the data to be analyzed includes: Calculating the attenuation ratio of the flexible bracket during the free vibration attenuation process according to the data to be analyzed; The damping corresponding to the attenuation ratio is calculated.

10. A device for determining parameters of a flexible support, characterized in that: include: A data acquisition module, used for acquiring time history data of the flexible support during free vibration after applying an exciting force to a preset excitation position in the flexible support; A data processing module, used to perform a preset data processing operation corresponding to the flexible stent parameters on the time course data to obtain data to be analyzed; The parameter calculation module is used to calculate the parameter values ​​of the flexible bracket parameters using the data to be analyzed.

11. An electronic device, characterized in that: The method comprises at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program so that the electronic device can implement the method for determining parameters of the flexible bracket as described in any one of claims 1 to 9.

12. A parameter determination system for a flexible support, characterized in that: The electronic device according to claim 11 further comprises: an excitation force applying device and a frequency acquisition device; The excitation force applying device is used to apply an excitation force to a preset excitation position in the flexible bracket based on the control of the electronic device; The frequency acquisition device is used to collect time course data of the flexible bracket during free vibration, and send the time course data to the electronic device.

13. The parameter determination system of the flexible support according to claim 12, characterized in that: The excitation force applying device is used to apply an excitation force to a preset excitation position in the flexible bracket based on the control of the electronic device, specifically for: receiving an exciting force application method determined by the electronic device; At the preset excitation position, an excitation force is applied according to the excitation force applying method.

14. The parameter determination system of the flexible support according to claim 12, characterized in that: The frequency acquisition device comprises: An acceleration sensor arranged at a specific position of the bracket, a transmitter connected to the sensor, and a data collector for receiving signals; The acceleration sensor is used to collect time-course data of the flexible bracket during free vibration, and send the time-course data to the electronic device through the transmitter and the data collector.

15. A computer storage medium, characterized in that The storage medium carries one or more computer programs, and when the one or more computer programs are executed by an electronic device, the electronic device can implement the method for determining parameters of a flexible bracket as described in any one of claims 1 to 9.

Images