A bolt loosening detection method, device and apparatus

Abstract

The application provides a bolt loosening detection method, device and equipment, and belongs to the technical field of safety detection. The bolt loosening detection method comprises the following steps: transmitting a pulse signal to a first PZT, and obtaining a low-frequency sinusoidal signal frequency through a second PZT; the first PZT is located at a first side of a bolt to be detected, and the second PZT is located at a second side of the bolt to be detected; transmitting a high-frequency sweep signal to a third PZT, and obtaining a high-frequency sinusoidal signal frequency through the second PZT; the third PZT is located at the first side of the bolt to be detected; transmitting a low-frequency sinusoidal signal corresponding to the low-frequency sinusoidal signal frequency to the first PZT and transmitting a high-frequency sinusoidal signal corresponding to the high-frequency sinusoidal signal frequency to the third PZT, and obtaining a signal response spectrum through the second PZT; and obtaining a loosening detection index of the bolt to be detected according to the low-frequency sinusoidal signal frequency, the high-frequency sinusoidal signal frequency and the signal response spectrum. According to the application, the loosening detection index is used to indicate the loosening condition of the bolt, so that the slight loosening of the bolt can be detected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety detection, in particular to a bolt loosening detection method, device and equipment. BACKGROUND

[0002] Threaded connection is the most widely used connection method in mechanical equipment, which is easily affected by vibration load in harsh service environment. At the initial stage of vibration, the threaded connection will be slightly loosened, and the slight loosening will gradually accumulate to induce serious loosening failure, thereby reducing the reliability of the product. Therefore, how to accurately detect the slight loosening of the bolt is crucial. SUMMARY

[0003] The bolt loosening detection method, device and equipment provided by the embodiments of the present application solve the problem that the slight loosening of the bolt cannot be detected in the prior art.

[0004] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0005] The bolt loosening detection method provided by the embodiments of the present application comprises:

[0006] The first piezoelectric sensor PZT is transmitted with a pulse signal, and the second PZT obtains a low-frequency sinusoidal signal frequency; the first PZT is located at a first side of the bolt to be detected, and the second PZT is located at a second side of the bolt to be detected; the first side and the second side are opposite sides of the bolt to be detected, respectively;

[0007] The third PZT is transmitted with a high-frequency sweep signal, and the second PZT obtains a high-frequency sinusoidal signal frequency; the third PZT is located at the first side of the bolt to be detected, and the first PZT and the third PZT are arranged at intervals;

[0008] The first PZT is transmitted with a low-frequency sinusoidal signal corresponding to the low-frequency sinusoidal signal frequency, and the third PZT is transmitted with a high-frequency sinusoidal signal corresponding to the high-frequency sinusoidal signal frequency, and the second PZT obtains a signal response spectrum;

[0009] According to the low-frequency sinusoidal signal frequency, the high-frequency sinusoidal signal frequency and the signal response spectrum, a loosening detection index of the bolt to be detected is obtained.

[0010] Optionally, the first piezoelectric sensor PZT is transmitted with a pulse signal, and the second PZT obtains a low-frequency sinusoidal signal frequency, comprising:

[0011] The first PZT is transmitted with a pulse signal, and the first-order natural frequency or the second-order natural frequency of the structural modal parameter obtained by the second PZT is taken as the low-frequency sinusoidal signal frequency.

[0012] Optionally, the third PZT emits a high-frequency sweep signal, and the high-frequency sinusoidal signal frequency is obtained through the second PZT, comprising:

[0013] The third PZT emits a high-frequency sweep signal, and the frequency corresponding to the signal with the highest peak value obtained through the second PZT is taken as the high-frequency sinusoidal signal frequency.

[0014] Optionally, the loosening detection index of the bolt to be detected is obtained according to the low-frequency sinusoidal signal frequency, the high-frequency sinusoidal signal frequency and the signal response spectrum, comprising:

[0015] According to the low-frequency sinusoidal signal frequency and the high-frequency sinusoidal signal frequency, the signal frequencies of the first N high-order sidebands on the left side of the high-frequency sinusoidal signal frequency and the signal frequencies of the first M high-order sidebands on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum are determined;

[0016] According to the signal response spectrum, the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands and the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands are determined; the signal response spectrum is used to indicate the corresponding relationship between the signal frequency and the signal amplitude;

[0017] According to the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands, the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands, N and M, the loosening detection index of the bolt to be detected is obtained;

[0018] Wherein, N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0019] Optionally, according to the low-frequency sinusoidal signal frequency and the high-frequency sinusoidal signal frequency, the signal frequencies of the first N high-order sidebands on the left side of the high-frequency sinusoidal signal frequency and the signal frequencies of the first M high-order sidebands on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum are determined, comprising:

[0020] The signal frequency of the nth high-order sideband on the left side of the high-frequency sinusoidal signal frequency in the signal response spectrum is obtained by subtracting n times the low-frequency sinusoidal signal frequency from the high-frequency sinusoidal signal frequency; n=1, 2……N;

[0021] The signal frequency of the mth high-order sideband on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum is obtained by adding m times the low-frequency sinusoidal signal frequency to the high-frequency sinusoidal signal frequency; m=1, 2……M.

[0022] Optionally, the loosening detection index of the bolt to be detected is obtained according to the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands, the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands, N and M, and comprises:

[0023] The loosening detection index of the bolt to be detected is obtained by dividing the sum of the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands and the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands by the sum of N and M.

[0024] Optionally, N is an integer greater than or equal to 3 and less than or equal to 6;

[0025] M is an integer greater than or equal to 3 and less than or equal to 6.

[0026] Optionally, N is 4;

[0027] M is 4.

[0028] The embodiments of the present application also provide a bolt loosening detection device, which comprises:

[0029] A first processing module is configured to emit a pulse signal to a first piezoelectric sensor (PZT) and obtain a low-frequency sinusoidal signal frequency through a second PZT; the first PZT is located at a first side of a bolt to be detected, and the second PZT is located at a second side of the bolt to be detected; the first side and the second side are opposite sides of the bolt to be detected;

[0030] A second processing module is configured to emit a high-frequency sweep signal to a third PZT and obtain the high-frequency sinusoidal signal frequency through the second PZT; the third PZT is located at the first side of the bolt to be detected, and the first PZT is arranged at intervals from the third PZT;

[0031] A third processing module is configured to emit a low-frequency sinusoidal signal corresponding to the low-frequency sinusoidal signal frequency to the first PZT and emit a high-frequency sinusoidal signal corresponding to the high-frequency sinusoidal signal frequency to the third PZT, and obtain a signal response spectrum through the second PZT;

[0032] A determination module is configured to obtain a loosening detection index of the bolt to be detected according to the low-frequency sinusoidal signal frequency, the high-frequency sinusoidal signal frequency and the signal response spectrum.

[0033] Optionally, the first processing module comprises:

[0034] A first processing unit is configured to emit a pulse signal to the first PZT and take a first-order natural frequency or a second-order natural frequency of a structure modal parameter obtained through the second PZT as the low-frequency sinusoidal signal frequency.

[0035] Optionally, the second processing module comprises:

[0036] a second processing unit configured to emit a high-frequency sweep signal to the third PZT, and take the frequency corresponding to the signal with the highest peak value obtained through the second PZT as the frequency of the high-frequency sinusoidal signal.

[0037] Optionally, the determining module comprises:

[0038] a first determining unit configured to determine, according to the low-frequency sinusoidal signal frequency and the high-frequency sinusoidal signal frequency, the signal frequencies of the first N high-order sidebands on the left side of the high-frequency sinusoidal signal frequency and the signal frequencies of the first M high-order sidebands on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum;

[0039] a second determining unit configured to determine, according to the signal response spectrum, the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands and the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands; the signal response spectrum is used to indicate the corresponding relationship between the signal frequency and the signal amplitude;

[0040] a third processing unit configured to obtain the looseness detection index of the bolt to be detected according to the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands, the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands, N and M.

[0041] wherein N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0042] Optionally, the first determining unit is specifically configured to:

[0043] obtain the signal frequency of the nth high-order sideband on the left side of the high-frequency sinusoidal signal frequency in the signal response spectrum by subtracting n times the low-frequency sinusoidal signal frequency from the high-frequency sinusoidal signal frequency; n = 1, 2, …, N;

[0044] obtain the signal frequency of the mth high-order sideband on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum by adding m times the low-frequency sinusoidal signal frequency to the high-frequency sinusoidal signal frequency; m = 1, 2, …, M.

[0045] Optionally, the third processing unit is specifically configured to:

[0046] The looseness detection index of the bolt to be detected is obtained by dividing the sum of the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands and the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands by the sum of N and M.

[0047] Optionally, N is an integer greater than or equal to 3 and less than or equal to 6.

[0048] M is an integer greater than or equal to 3 and less than or equal to 6.

[0049] Optionally, N is 4.

[0050] M is 4.

[0051] The embodiment of the present application further provides a bolt looseness detection device, which comprises a processor, a memory and a program stored in the memory and executable on the processor, and the program implements the steps of the bolt looseness detection method according to any one of the above embodiments when executed by the processor.

[0052] The embodiment of the present application further provides a readable storage medium, which stores a program, and the program implements the steps of the bolt looseness detection method according to any one of the above embodiments when executed by a processor.

[0053] The present application has the following advantages:

[0054] According to the present application, the first PZT and the third PZT are arranged on the first side of the bolt to be detected, the second PZT is arranged on the second side of the bolt to be detected, the pulse signal is transmitted to the first PZT, the low-frequency sinusoidal signal frequency is obtained through the second PZT, the high-frequency sweep signal is transmitted to the third PZT, the high-frequency sinusoidal signal frequency is obtained through the second PZT, the low-frequency sinusoidal signal corresponding to the low-frequency sinusoidal signal frequency is transmitted to the first PZT, the high-frequency sinusoidal signal corresponding to the high-frequency sinusoidal signal frequency is transmitted to the third PZT, the signal response spectrum is obtained through the second PZT, and the looseness detection index of the bolt to be detected is obtained according to the low-frequency sinusoidal signal frequency, the high-frequency sinusoidal signal frequency and the signal response spectrum, so that the looseness of the bolt can be detected. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 A flow chart of the bolt looseness detection method provided by the embodiment of the present application is shown in the figure.

[0056] Figure 2 A structural schematic diagram of the micro looseness detection device provided by the embodiment of the present application is shown in the figure.

[0057] Figure 3 A schematic diagram of the signal response spectrum provided by the embodiment of the present application is shown in the figure.

[0058] Figure 4 Figure 1 shows a structural schematic diagram of a bolt loosening detection device provided by an embodiment of the present application.

[0059] Figure 5 Figure 1 shows a structural schematic diagram of a bolt loosening detection device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0060] In order to make the object, technical solutions and advantages of the present application clearer, the present application will be described in detail below with reference to the drawings and specific embodiments.

[0061] The present application aims at the problem in the prior art that the slight loosening of a bolt cannot be detected, and provides a bolt loosening detection method, device and equipment.

[0062] As shown in Figure 1 Figure 1, an embodiment of the present application provides a bolt loosening detection method, which comprises the following steps.

[0063] Step 101: transmitting a pulse signal to a first piezoelectric sensor PZT, and obtaining a low-frequency sinusoidal signal frequency through a second PZT; the first PZT is located at a first side of a bolt to be detected, and the second PZT is located at a second side of the bolt to be detected; the first side and the second side are opposite sides of the bolt to be detected.

[0064] It should be noted that, as shown in Figure 2 Figure 1, an embodiment of the present application provides a slight loosening detection device, which comprises a bolt to be detected for connecting a pressure member 1, and a first piezoelectric sensor (PZT) 3 and a third PZT 4 are pasted on a first side of the bolt to be detected 2, and the first PZT 3 and the third PZT 4 are pasted and arranged at intervals, and a second PZT 5 is pasted on a second side of the bolt to be detected 2, wherein the first PZT 3 and the third PZT 4 serve as a transmitting device, and the second PZT 5 serves as a receiving device.

[0065] In this step, first, the size of the signal frequency transmitted by the first PZT 3 in the transmitting device is determined, that is, an excitation (pulse signal) is transmitted to the first piezoelectric sensor PZT, and a low-frequency sinusoidal signal frequency is obtained through the second PZT.

[0066] Step 102: transmitting a high-frequency sweep signal to the third PZT, and obtaining a high-frequency sinusoidal signal frequency through the second PZT; the third PZT is located at the first side of the bolt to be detected, and the first PZT and the third PZT are arranged at intervals.

[0067] In this step, by transmitting a high-frequency sweep signal of 1kHz-100kHz to the third PZT 4 in the transmitting device, a high-frequency sinusoidal signal frequency is obtained through the second PZT.

[0068] Step 103: transmitting a low-frequency sinusoidal signal corresponding to the low-frequency sinusoidal signal frequency to the first PZT and transmitting a high-frequency sinusoidal signal corresponding to the high-frequency sinusoidal signal frequency to the third PZT, and obtaining a signal response spectrum through the second PZT.

[0069] After obtaining the low-frequency sinusoidal signal frequency and the high-frequency sinusoidal signal frequency, a low-frequency sinusoidal signal corresponding to the low-frequency sinusoidal signal frequency is transmitted to the first PZT and a high-frequency sinusoidal signal corresponding to the high-frequency sinusoidal signal frequency is transmitted to the third PZT at the same time, and a fast Fourier transform (FFT) is performed on the output signal of the second PZT 5 to obtain a signal response spectrum as shown in FIG. 4. Figure 3 The low-frequency sinusoidal signal is a low-frequency pump wave, and the high-frequency sweep signal is a high-frequency probe wave.

[0070] Step 104: obtaining a looseness detection index of the bolt to be detected according to the low-frequency sinusoidal signal frequency, the high-frequency sinusoidal signal frequency, and the signal response spectrum.

[0071] The looseness detection index of the bolt to be detected is used to indicate the slight looseness of the bolt to be detected. That is, the slight looseness detection device and the looseness detection index provided by the embodiment of the present application are used to determine the slight looseness of the bolt to be detected.

[0072] In an optional embodiment of the present application, the transmitting a low-frequency sinusoidal signal to the first piezoelectric sensor PZT and obtaining a low-frequency sinusoidal signal frequency through the second PZT comprises:

[0073] transmitting a pulse signal to the first PZT 3 and obtaining a structural modal parameter through the second PZT, and taking a first-order natural frequency or a second-order natural frequency of the structural modal parameter as the low-frequency sinusoidal signal frequency.

[0074] In an optional embodiment of the present application, the transmitting a high-frequency sweep signal to the third PZT and obtaining a high-frequency sinusoidal signal frequency through the second PZT comprises:

[0075] transmitting a high-frequency sweep signal to the third PZT and obtaining a signal response through the second PZT, and taking a frequency corresponding to a signal with the highest peak value in the signal response as the high-frequency sinusoidal signal frequency.

[0076] As an optional embodiment of the present application, the loosening detection index of the bolt to be detected is obtained according to the low-frequency sinusoidal signal frequency, the high-frequency sinusoidal signal frequency and the signal response spectrum, and the method comprises the following steps:

[0077] In the signal response spectrum, according to the low-frequency sinusoidal signal frequency and the high-frequency sinusoidal signal frequency, the signal frequencies of the first N (N is an integer greater than or equal to 1) high-order sidebands located on the left side of the high-frequency sinusoidal signal frequency and the signal frequencies of the first M (M is an integer greater than or equal to 1) high-order sidebands located on the right side of the high-frequency sinusoidal signal frequency are determined; as shown in the figure, the signal response spectrum indicates the corresponding relationship between the signal frequency and the signal amplitude, according to the signal response spectrum, the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands and the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands are determined; and then according to the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands, the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands, N and M, the loosening detection index of the bolt to be detected is obtained. Figure 3

[0078] Further, in the signal response spectrum, the process of determining the frequency of the high-order signal is that, according to the low-frequency sinusoidal signal frequency and the high-frequency sinusoidal signal frequency, the signal frequencies of the first N high-order sidebands located on the left side of the high-frequency sinusoidal signal frequency and the signal frequencies of the first M high-order sidebands located on the right side of the high-frequency sinusoidal signal frequency are determined, and the method comprises the following steps:

[0079] The signal frequency of the nth high-order sideband located on the left side of the high-frequency sinusoidal signal frequency in the signal response spectrum is obtained by subtracting n times the low-frequency sinusoidal signal frequency from the high-frequency sinusoidal signal frequency; n=1, 2, …, N, as a preferred embodiment, N is an integer greater than or equal to 3 and less than or equal to 6, and as a more preferred embodiment, N is equal to 4;

[0080] The signal frequency of the mth high-order sideband located on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum is obtained by adding m times the low-frequency sinusoidal signal frequency to the high-frequency sinusoidal signal frequency; m=1, 2, …, M, as a preferred embodiment, M is an integer greater than or equal to 3 and less than or equal to 6, and as a more preferred embodiment, M is equal to 4.

[0081] Exemplarily, please refer to Figure 3 ​, in the signal response spectrum, the low frequency sinusoidal signal frequency is represented by "LF", the high frequency sinusoidal signal frequency is represented by "HF", the high order sideband on the left side of the high frequency sinusoidal signal frequency is represented by "LHS", the high order sideband on the right side of the high frequency sinusoidal signal frequency is represented by "RHS", in the case of N equal to 4 and M equal to 4, the signal frequencies of the first four high order sidebands on the left side of the high frequency sinusoidal signal frequency are represented by LHS 1st , LHS 2ed , LHS 3rd and LHS 4th respectively, the signal frequencies of the first four high order sidebands on the right side of the high frequency sinusoidal signal frequency are represented by RHS 1st , RHS 2ed , RHS 3rd and RHS 4th .

[0082] Wherein, LHS 1st = HF-LF, LHS 2ed = HF-2LF, LHS 3rd = HF-3LF, LHS 4th = HF-4LF;

[0083] RHS 1st = HF+LF, RHS 2ed = HF+2LF, RHS 3rd = HF+3LF, RHS 4th = HF+4LF.

[0084] Further, the loosening detection index of the bolt to be detected is obtained according to the signal amplitude corresponding to the signal frequency of each of the first N high order sidebands, the signal amplitude corresponding to the signal frequency of each of the first M high order sidebands, N and M, comprising:

[0085] The loosening detection index of the bolt to be detected is obtained by dividing the sum of the signal amplitude corresponding to the signal frequency of each of the first N high order sidebands and the signal amplitude corresponding to the signal frequency of each of the first M high order sidebands by the sum of N and M, that is, the loosening detection index of the bolt to be detected is a new loosening index combined with the first four high order sidebands.

[0086] The amplitudes corresponding to the signal frequencies of the first four high order sidebands on the left side of the high frequency sinusoidal signal frequency are represented by AL 1st , AL 2ed , AL 3rd and AL 4th respectively, the amplitudes corresponding to the signal frequencies of the first four high order sidebands on the right side of the high frequency sinusoidal signal frequency are represented by AR 1st , AR2ed , AR 3rd and AR 4th indicates.

[0087] HSLI is calculated according to the following formula:

[0088]

[0089] where N+M equals 8.

[0090] As Figure 4 shown, the bolt loosening detection device also provided by the embodiment of the application comprises:

[0091] The first processing module 401 is configured to transmit a pulse signal to the first piezoelectric sensor PZT and obtain a low-frequency sinusoidal signal frequency through the second PZT; the first PZT is located on a first side of a bolt to be detected, and the second PZT is located on a second side of the bolt to be detected; the first side and the second side are opposite sides of the bolt to be detected, respectively.

[0092] The second processing module 402 is configured to transmit a high-frequency sweep signal to the third PZT and obtain a high-frequency sinusoidal signal frequency through the second PZT; the third PZT is located on the first side of the bolt to be detected, and the first PZT is arranged at intervals from the third PZT.

[0093] The third processing module 403 is configured to transmit a low-frequency sinusoidal signal corresponding to the low-frequency sinusoidal signal frequency to the first PZT and transmit a high-frequency sinusoidal signal corresponding to the high-frequency sinusoidal signal frequency to the third PZT, and obtain a signal response spectrum through the second PZT.

[0094] The determining module 404 is configured to obtain a loosening detection index of the bolt to be detected according to the low-frequency sinusoidal signal frequency, the high-frequency sinusoidal signal frequency, and the signal response spectrum.

[0095] Optionally, the first processing module 401 comprises:

[0096] The first processing unit is configured to transmit a pulse signal to the first PZT and take a first-order natural frequency or a second-order natural frequency of a structure modal parameter obtained through the second PZT as the low-frequency sinusoidal signal frequency.

[0097] Optionally, the second processing module 402 comprises:

[0098] The second processing unit is configured to transmit a high-frequency sweep signal to the third PZT and take a frequency corresponding to a signal with the highest peak value obtained through the second PZT as the high-frequency sinusoidal signal frequency.

[0099] Optionally, the determining module 404 comprises:

[0100] a first determining unit, configured to determine, according to the low-frequency sinusoidal signal frequency and the high-frequency sinusoidal signal frequency, signal frequencies of the first N high-order sidebands located on the left side of the high-frequency sinusoidal signal frequency and signal frequencies of the first M high-order sidebands located on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum;

[0101] a second determining unit, configured to determine, according to the signal response spectrum, a signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands and a signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands; the signal response spectrum is used to indicate the corresponding relationship between the signal frequency and the signal amplitude;

[0102] a third processing unit, configured to obtain the looseness detection index of the bolt to be detected according to the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands, the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands, N and M.

[0103] wherein N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0104] Optionally, the first determining unit is specifically configured to:

[0105] obtain the signal frequency of the nth high-order sideband located on the left side of the high-frequency sinusoidal signal frequency in the signal response spectrum by subtracting n times the low-frequency sinusoidal signal frequency from the high-frequency sinusoidal signal frequency; n = 1, 2, …, N;

[0106] obtain the signal frequency of the mth high-order sideband located on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum by adding m times the low-frequency sinusoidal signal frequency to the high-frequency sinusoidal signal frequency; m = 1, 2, …, M.

[0107] Optionally, the third processing unit is specifically configured to:

[0108] obtain the looseness detection index of the bolt to be detected by dividing the sum of the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands and the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands by the sum of N and M.

[0109] Optionally, N is an integer greater than or equal to 3 and less than or equal to 6;

[0110] M is an integer greater than or equal to 3 and less than or equal to 6.

[0111] Optionally, N is 4;

[0112] M is 4.

[0113] It should be noted that the bolt loosening detection device provided by the embodiments of the present application is a device capable of performing the bolt loosening detection method described above, and all the embodiments of the bolt loosening detection method described above are applicable to the device and can achieve the same or similar technical effects.

[0114] As shown in Figure 5 The present application also provides a bolt loosening detection device, which comprises a processor 501, a memory 502, and a program stored in the memory 502 and executable on the processor 501, wherein the program is executed by the processor 501 to implement the bolt loosening detection method described above.

[0115] Optionally, the device further comprises a transceiver 503, which is configured to receive and send data under the control of the processor 501.

[0116] Specifically, the processor 501 performs the following processes:

[0117] transmits a pulse signal to a first piezoelectric sensor PZT and obtains a low-frequency sinusoidal signal frequency through a second PZT; the first PZT is located on a first side of a bolt to be detected, and the second PZT is located on a second side of the bolt to be detected; the first side and the second side are opposite sides of the bolt to be detected;

[0118] transmits a high-frequency sweep signal to a third PZT and obtains a high-frequency sinusoidal signal frequency through the second PZT; the third PZT is located on the first side of the bolt to be detected, and the first PZT and the third PZT are arranged at intervals;

[0119] transmits a low-frequency sinusoidal signal corresponding to the low-frequency sinusoidal signal frequency to the first PZT and transmits a high-frequency sinusoidal signal corresponding to the high-frequency sinusoidal signal frequency to the third PZT, and obtains a signal response spectrum through the second PZT;

[0120] obtains a loosening detection index of the bolt to be detected according to the low-frequency sinusoidal signal frequency, the high-frequency sinusoidal signal frequency, and the signal response spectrum.

[0121] Optionally, the processor 501 is configured to:

[0122] transmits a pulse signal to the first PZT, and takes a first-order natural frequency or a second-order natural frequency of a structural modal parameter obtained through the second PZT as the low-frequency sinusoidal signal frequency.

[0123] Optionally, the processor 501 is configured to:

[0124] A high-frequency sweep signal is transmitted to the third PZT, and a frequency corresponding to a signal with the highest peak value obtained through the second PZT is taken as a frequency of the high-frequency sinusoidal signal.

[0125] Optionally, the processor 501 is specifically configured to:

[0126] According to the low-frequency sinusoidal signal frequency and the high-frequency sinusoidal signal frequency, signal frequencies of the first N high-order sidebands located on the left side of the high-frequency sinusoidal signal frequency and signal frequencies of the first M high-order sidebands located on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum are determined.

[0127] According to the signal response spectrum, signal amplitudes corresponding to the signal frequencies of each of the first N high-order sidebands and signal amplitudes corresponding to the signal frequencies of each of the first M high-order sidebands are determined; the signal response spectrum is used to indicate the corresponding relationship between the signal frequencies and the signal amplitudes.

[0128] According to the signal amplitudes corresponding to the signal frequencies of each of the first N high-order sidebands, the signal amplitudes corresponding to the signal frequencies of each of the first M high-order sidebands, N and M, a looseness detection index of the bolt to be detected is obtained.

[0129] N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0130] Optionally, the processor 501 is specifically configured to:

[0131] The signal frequency of the nth high-order sideband located on the left side of the high-frequency sinusoidal signal frequency in the signal response spectrum is obtained by subtracting n times the low-frequency sinusoidal signal frequency from the high-frequency sinusoidal signal frequency; n = 1, 2, …, N.

[0132] The signal frequency of the mth high-order sideband located on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum is obtained by adding m times the low-frequency sinusoidal signal frequency to the high-frequency sinusoidal signal frequency; m = 1, 2, …, M.

[0133] Optionally, the processor 501 is specifically configured to:

[0134] The looseness detection index of the bolt to be detected is obtained by dividing the sum of the signal amplitudes corresponding to the signal frequencies of each of the first N high-order sidebands and the signal amplitudes corresponding to the signal frequencies of each of the first M high-order sidebands by the sum of N and M.

[0135] Optionally, N is an integer greater than or equal to 3 and less than or equal to 6.

[0136] M is an integer greater than or equal to 3 and less than or equal to 6.

[0137] Optionally, N is 4;

[0138] M is 4.

[0139] wherein, in Figure 5 The bus architecture can include any number of interconnected buses and bridges, specifically the various circuitry linking the processor(s) 501 and memory represented by the memory 502. The bus architecture can also link various other circuitry such as peripheral devices, voltage regulators, and power management circuitry, all of which are well known in the art and thus, not further described herein. The bus interface provides a user interface 504. The transceiver 503 can be multiple elements, i.e., including a transmitter and a receiver, providing the means for communicating with various other apparatus over a transmission medium. The processor 501 is responsible for managing the bus architecture and general processing, and the memory 502 can store data used by the processor 501 in executing operations.

[0140] In addition, the embodiments of the present application further provide a readable storage medium, wherein a program is stored on the readable storage medium, and the program is executed by a processor to implement the steps in any one of the bolt loosening detection methods.

[0141] The above describes the preferred embodiments of the present application, it should be noted that for the ordinary person in the art, without departing from the principles of the present application described in the premise can also be made several improvements and refinements, these improvements and refinements are also within the scope of the present application.

Claims

1. A bolt loosening detection method characterized by, The method comprises: a pulse signal is transmitted to a first piezoelectric sensor, and a low-frequency sinusoidal signal frequency is obtained through a second piezoelectric sensor; the first piezoelectric sensor is located on a first side of a bolt to be detected, and the second piezoelectric sensor is located on a second side of the bolt to be detected; the first side and the second side are opposite sides of the bolt to be detected; a high-frequency sweep signal is transmitted to a third piezoelectric sensor, and a high-frequency sinusoidal signal frequency is obtained through the second piezoelectric sensor; the third piezoelectric sensor is located on the first side of the bolt to be detected, and the first piezoelectric sensor and the third piezoelectric sensor are arranged at intervals; a low-frequency sinusoidal signal corresponding to the low-frequency sinusoidal signal frequency is transmitted to the first piezoelectric sensor, and a high-frequency sinusoidal signal corresponding to the high-frequency sinusoidal signal frequency is transmitted to the third piezoelectric sensor, and a signal response spectrum is obtained through the second piezoelectric sensor; According to the low-frequency sinusoidal signal frequency and the high-frequency sinusoidal signal frequency, the signal frequencies of the first N high-order sidebands located on the left side of the high-frequency sinusoidal signal frequency and the signal frequencies of the first M high-order sidebands located on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum are determined, comprising: The signal frequency of the nth high-order sideband located on the left side of the high-frequency sinusoidal signal frequency in the signal response spectrum is obtained by subtracting n times the low-frequency sinusoidal signal frequency from the high-frequency sinusoidal signal frequency; n=1, 2…N; wherein N is an integer greater than or equal to 3 and less than or equal to 6; The signal frequency of the mth high-order sideband located on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum is obtained by adding m times the low-frequency sinusoidal signal frequency to the high-frequency sinusoidal signal frequency; m=1, 2…M; wherein M is an integer greater than or equal to 3 and less than or equal to 6; According to the signal response spectrum, the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands and the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands are determined; the signal response spectrum is used to indicate the corresponding relationship between the signal frequency and the signal amplitude; The looseness detection index of the bolt to be detected is obtained by dividing the sum of the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands and the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands by the sum of N and M.

2. The bolt loosening detection method according to claim 1, characterized by, The pulse signal is transmitted to the first piezoelectric sensor, and the low-frequency sinusoidal signal frequency is obtained through the second piezoelectric sensor, comprising: The first-order natural frequency or the second-order natural frequency of the structural modal parameters obtained through the second piezoelectric sensor is taken as the low-frequency sinusoidal signal frequency by transmitting the pulse signal to the first piezoelectric sensor.

3. The bolt loosening detection method according to claim 1, characterized by, The high-frequency sweep signal is transmitted to the third piezoelectric sensor, and the high-frequency sinusoidal signal frequency is obtained through the second piezoelectric sensor, comprising: The frequency corresponding to the signal with the highest peak value obtained through the second piezoelectric sensor is taken as the high-frequency sinusoidal signal frequency by transmitting the high-frequency sweep signal to the third piezoelectric sensor.

4. The bolt loosening detection method according to claim 1, characterized by, N is 4; M is 4.

5. A bolt loosening detection device characterized by comprising: The device comprises: The first processing module is configured to transmit a pulse signal to a first piezoelectric sensor and obtain a low-frequency sinusoidal signal frequency through a second piezoelectric sensor; the first piezoelectric sensor is located on a first side of a bolt to be detected, and the second piezoelectric sensor is located on a second side of the bolt to be detected; the first side and the second side are opposite sides of the bolt to be detected; The second processing module is configured to transmit a high-frequency sweep signal to a third piezoelectric sensor and obtain a high-frequency sinusoidal signal frequency through the second piezoelectric sensor; the third piezoelectric sensor is located on the first side of the bolt to be detected, and the first piezoelectric sensor and the third piezoelectric sensor are arranged at intervals; The third processing module is configured to transmit a low-frequency sinusoidal signal corresponding to the low-frequency sinusoidal signal frequency to the first piezoelectric sensor and transmit a high-frequency sinusoidal signal corresponding to the high-frequency sinusoidal signal frequency to the third piezoelectric sensor, and obtain a signal response spectrum through the second piezoelectric sensor; The first determining unit is configured to determine, according to the low-frequency sinusoidal signal frequency and the high-frequency sinusoidal signal frequency, signal frequencies of the first N high-order sidebands located on the left side of the high-frequency sinusoidal signal frequency and signal frequencies of the first M high-order sidebands located on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum, including: The signal frequency of the nth high-order sideband located on the left side of the high-frequency sinusoidal signal frequency in the signal response spectrum is obtained by subtracting n times the low-frequency sinusoidal signal frequency from the high-frequency sinusoidal signal frequency; n = 1, 2, …, N; wherein N is an integer greater than or equal to 3 and less than or equal to 6; The signal frequency of the mth high-order sideband located on the right side of the high-frequency sinusoidal signal frequency in the signal response spectrum is obtained by adding m times the low-frequency sinusoidal signal frequency to the high-frequency sinusoidal signal frequency; m = 1, 2, …, M; wherein M is an integer greater than or equal to 3 and less than or equal to 6; The second determining unit is configured to determine, according to the signal response spectrum, a signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands and a signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands; the signal response spectrum is used to indicate the corresponding relationship between the signal frequency and the signal amplitude; The third processing unit is configured to divide the sum of the signal amplitude corresponding to the signal frequency of each of the first N high-order sidebands and the signal amplitude corresponding to the signal frequency of each of the first M high-order sidebands by the sum of N and M to obtain a looseness detection index of the bolt to be detected.

6. A bolt loosening detection apparatus characterized by comprising: including: A processor, a memory, and a program stored on the memory and executable on the processor, the program being executed by the processor to implement the steps of the bolt looseness detection method according to any one of claims 1 to 4.

7. A readable storage medium, characterized by, The program is stored on the readable storage medium, and the program is executed by the processor to implement the steps of the bolt looseness detection method according to any one of claims 1 to 4.

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