CN109182728B - Green intelligent vibration aging system and method - Google Patents
Green intelligent vibration aging system and method Download PDFInfo
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- CN109182728B CN109182728B CN201811050251.5A CN201811050251A CN109182728B CN 109182728 B CN109182728 B CN 109182728B CN 201811050251 A CN201811050251 A CN 201811050251A CN 109182728 B CN109182728 B CN 109182728B
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Abstract
The green intelligent vibration aging system comprises an upper computer system, a signal generator, a driver, a vibration exciter, a strain sensor, a dynamic strain gauge, an acceleration sensor, a charge amplifier, an oscilloscope, a data acquisition card and a supporting device; the vibration exciter is fixed on the surface of a component, and the component is supported by adopting an elastic supporting device; the upper computer system comprises a strain waveform acquisition module, a strain peak value extraction module, a dynamic stress conversion module, a component elastic modulus setting module, a voltage waveform acquisition module and a voltage peak value extraction module. The green intelligent vibration aging method comprises numerical simulation analysis; determining an effective vibration mode and a reference frequency; fixedly connecting the component with the vibration exciter to elastically support the component; obtaining a vibration stress conversion method; determining excitation frequency; determining excitation stress; and determining the excitation time. The invention has the advantages of improving the intelligent level of the vibration aging system and obtaining the ideal effect of eliminating the residual stress by vibration aging.
Description
Technical Field
The invention relates to the technical field of vibration aging, in particular to a green intelligent vibration aging system and method.
Technical Field
How to eliminate the residual stress in the processing and manufacturing process of the component is an important research topic in the field of mechanical manufacturing industry. The traditional residual stress eliminating method is mainly a thermal aging technology, however, the defects of the thermal aging technology in application mainly comprise high energy consumption, long aging treatment time, expensive heat treatment equipment, difficult field operation and easy environmental pollution. The vibration aging technology has the characteristics of good treatment effect, short treatment time, small environmental pollution, low energy consumption, easy field operation and the like, and belongs to an efficient energy-saving green environment-friendly aging treatment technology; vibration aging technology has the potential to replace traditional thermal aging technology in the twenty-first century. Therefore, the method has important theoretical significance and engineering application value for developing and researching the vibration aging technology. However, the current vibration aging system has low intelligent level, and reduces the efficiency of vibration aging treatment. In addition, the vibration aging system applied to the market at present adopts a traditional sweep frequency method to determine the vibration aging excitation frequency, and the residual stress distribution state of the component is not considered, so that the determined vibration aging excitation frequency is not beneficial to obtaining the ideal effect of eliminating the residual stress by vibration aging. The determination of the vibration stress is mainly carried out according to a macroscopic mechanism, namely the sum of the amplitude of the dynamic stress generated by the vibration exciter and the residual stress is larger than the yield strength of the aging component, and the amplitude of the dynamic stress is smaller than the fatigue limit of the component. In the development of vibration aging experiments, the acceleration level of a component is generally used to evaluate the excitation stress acting on the component. Although the acceleration stage can be used to characterize the magnitude of the vibration energy acting on the component, the excitation stress acting on the component cannot be directly derived from the acceleration stage. The vibration exciting time is determined mainly according to the weight of an aging component or vibration response in the vibration aging treatment process of the aging component, when the acceleration curve is flattened after rising, is lowered after rising, is flattened and the like, the vibration aging treatment is continued for 3-5 min, and the accumulated vibration aging treatment time is generally not longer than 40min.
In summary, when the conventional vibration aging system is used for carrying out vibration aging treatment on the component, great subjectivity exists in formulating process parameters, and specific process parameter values are determined mainly by experience, so that the condition that residual stress eliminating effect is not ideal in the application of the vibration aging technology is caused, and further research on the vibration aging system and method is needed. Aiming at the defects of low intelligent level and unsatisfactory time effect of the conventional vibration aging system in application, the invention provides a green intelligent vibration aging system and method.
Disclosure of Invention
Aiming at the defects of low intelligent level and unsatisfactory effect of the conventional vibration aging system in application, the invention provides a green intelligent vibration aging system and method, and aims to improve the intelligent level of the vibration aging system and obtain an ideal effect of eliminating residual stress of vibration aging.
The green intelligent vibration aging system comprises an upper computer system, a signal generator, a driver, a vibration exciter, a strain sensor, a dynamic strain gauge, an acceleration sensor, a charge amplifier, an oscilloscope, a data acquisition card and a supporting device; the vibration exciter is fixed on the surface of a component, and the component is supported by adopting an elastic supporting device; the upper computer system control signal generator outputs a sine excitation signal with independent amplitude and frequency and continuously adjustable; the sinusoidal excitation signal output by the signal generator is input to the vibration exciter through the driver, and the vibration exciter is driven to generate vibration; the acceleration sensor is arranged on the component, the output end of the acceleration sensor is connected with the input end of the charge amplifier, the output end of the charge amplifier is connected with the input end of the oscilloscope, and the output end of the oscilloscope is connected with the input end of the data acquisition card; the strain sensor is stuck on the component, the outgoing line of the strain sensor is connected with the input end of the dynamic strain gauge, and the output end of the dynamic strain gauge is connected with the input end of the data acquisition card; the output end of the data acquisition card is connected with the upper computer system.
The upper computer system comprises a strain waveform acquisition module for acquiring a strain waveform acquired by a dynamic strain gauge, a strain peak value extraction module for extracting a strain peak value epsilon (mu epsilon) from the strain waveform, a dynamic stress conversion module for converting the extracted strain peak value into exciting dynamic stress, a component elastic modulus setting module, a voltage waveform acquisition module for acquiring a voltage waveform displayed by an oscilloscope, and a voltage peak value extraction module for extracting a voltage peak value U (V) from the voltage waveform.
The elastic modulus setting module of the component is preset with the elastic modulus E (GPa) of the component; the conversion relation between the excitation stress and the strain peak value is thatWherein sigma d And the vibration stress is displayed to a user through a display interface in the upper computer system.
Further, the supporting device is an elastic element.
Further, the acceleration sensor is a piezoelectric acceleration sensor.
The green intelligent vibration aging method comprises the following steps:
(1) The upper computer system is pre-provided with finite element numerical simulation software, a three-dimensional finite element model of the component is built by adopting the finite element numerical simulation software, and the actual processing and manufacturing process of the component is simulated to obtain the surface residual stress distribution state of the component; carrying out numerical mode analysis on the component to obtain the strain vibration mode and the natural frequency of each step of the component;
(2) Determining the area where the larger residual stress of the component is located according to the distribution state of the residual stress on the surface of the component obtained by numerical simulation analysis; determining the region where the larger strain of each stage of strain vibration mode is located according to the strain vibration mode of each stage of the component obtained by numerical mode analysis; selecting a strain vibration mode when the area where the larger strain of the strain vibration mode is located is consistent with the area where the larger residual stress is located as an effective vibration mode during vibration aging treatment, and taking the natural frequency corresponding to the strain vibration mode as a reference frequency during frequency sweep treatment and recording as f r (Hz)；
(3) Determining the positions of the vibration peak value and the vibration node of the component according to the effective vibration mode determined in the step (2); fixing the vibration exciter at the vibration peak position of the component; supporting the component by adopting an elastic supporting device at the vibration node of the component so as to facilitate the vibration exciter to excite the component; the acceleration sensor is installed in the area where the larger residual stress of the component is located; adhering a strain sensor to the area where the larger residual stress of the component is located; connecting a signal connection line; switching on a power supply;
(4) Setting the elastic modulus E (GPa) of the member in the member elastic modulus setting module; the strain waveform acquisition module acquires a strain waveform acquired by the dynamic strain gauge; the strain peak value extraction module extracts a strain peak value epsilon (mu epsilon) from the strain waveform; the conversion relation between the vibration stress and the strain peak value output in the vibration stress conversion module is thatAnd display to the user through the display interface in the upper computer system;
(5) The reference frequency f determined according to step (2) r (Hz), determination of 0.8f r (Hz) as the initial excitation frequency of the sweep frequency vibration, starting to carry out the sweep frequency vibration on the component, and obtaining the frequency with the maximum vibration amplitude of the component as the excitation frequency f during the vibration aging treatment;
(6) Performing fixed-frequency vibration aging treatment on the component at the determined excitation frequency f, and determining the vibration stress of the component during the vibration aging treatment according to the distribution state of the residual stress on the surface of the component obtained by the numerical simulation analysis in the step (1) and the vibration stress on the component obtained by the test in the step (4);
(7) And when the member is subjected to fixed-frequency vibration aging treatment at the determined excitation frequency f, acquiring peak values of the strain signals at intervals of delta t, and when the peak values of the strain signals are kept unchanged, cutting off the power supply to stop the vibration aging treatment of the member.
Further, the finite element numerical simulation software is ANSYS finite element software.
Further, the signal connection line comprises a signal connection line between the upper computer system and the signal generator; a signal connection between the signal generator and the driver; a signal connection line between the driver and the vibration exciter; a signal connection between the strain sensor and the dynamic strain gauge; a signal connection line between the dynamic strain gauge and the data acquisition card; a signal connection between the acceleration sensor and the charge amplifier; a signal connection between the charge amplifier and the oscilloscope; a signal connection line between the oscilloscope and the data acquisition card; a signal connection line between the data acquisition card and the upper computer system; the power supply comprises an upper computer system, a signal generator, a driver, a vibration exciter, a dynamic strain gauge, a charge amplifier, an oscilloscope and a power supply of a data acquisition card.
Further, the reference frequency f determined according to step (2) in step (5) r (Hz), determination of 0.8f r (Hz) as an initial excitation frequency of the swept frequency vibration, starting the swept frequency vibration of the member, and obtaining a frequency with the maximum vibration amplitude of the member as an excitation frequency f in the vibration aging treatment, wherein the method comprises the following steps:
(5.1) initial excitation frequency f of the swept frequency vibration 1 Set to 0.8f r (Hz) and then gradually increasing the frequency of the swept vibration in steps of 10 Hz; the voltage waveform acquisition module in the upper computer system records the voltage waveform displayed by the oscillograph when each excitation frequency is recorded, the voltage peak value extraction module in the upper computer system extracts the peak value of the voltage waveform displayed by the oscillograph when each excitation frequency is extracted to obtain the frequency when the voltage peak value is maximum,and is denoted as f 11 ；
(5.2) setting the initial excitation frequency of the swept vibration to (f 11 -10) Hz, step-wise increasing the frequency of the sweep vibration with 1Hz step-wise; then repeating the process of the step (5.1) to obtain the frequency when the voltage peak value is maximum, and marking as f 12 Namely the excitation frequency f during the vibration aging treatment.
Further, the voltage peaks are used to characterize the amplitude of vibration acting on the component.
The sensitivity value of the acceleration sensor is s (pC/ms -2 ) The sensitivity coefficient of the input end of the charge amplifier is S (pC/Unit), the amplification coefficient is F (Unit/V), the conversion relation between the acceleration vibration level and the voltage peak value acting on the component isThe voltage peak value is used for representing the vibration amplitude acting on the component, and the voltage peak value is used for representing the vibration amplitude acting on the component, so that the processing workload of an upper computer system can be reduced, and the operation efficiency of the whole green intelligent vibration aging system is improved.
Further, the determination of the vibration stress in the step (6) is based on that the sum of the amplitude of the vibration stress generated by the vibration exciter and the peak residual stress obtained by the numerical simulation analysis is larger than the yield strength of the component, and the amplitude of the vibration stress generated by the vibration exciter is smaller than the fatigue limit of the component.
Further, the interval Δt in the step (7) is 1min.
The technical conception of the invention is as follows: the intelligent vibration aging system is composed of an upper computer system, a signal generator, a driver, a vibration exciter, an acceleration sensor, a strain sensor, a dynamic strain gauge, a charge amplifier, an oscilloscope, a data acquisition card and a supporting device, the whole system is controlled by the upper computer system, the intelligent level of the vibration aging system is improved, meanwhile, the technological parameters during vibration aging treatment are determined by adopting a means of combining virtual simulation and dynamic strain testing technology, and the ideal effect of eliminating residual stress of vibration aging can be obtained.
The beneficial effects of the invention are as follows:
1. when the green intelligent vibration aging system provided by the invention is used for vibration aging treatment of the components, the upper computer system is used for controlling, so that the workload is reduced, and the working efficiency and the intelligent level of the vibration aging system are improved.
2. The green intelligent vibration aging system provided by the invention adopts the virtual simulation and dynamic strain test technology when determining the technological parameters of the vibration aging treatment of the component, thereby being beneficial to obtaining the ideal effect of eliminating the residual stress of the vibration aging.
3. When the green intelligent vibration aging system provided by the invention is used for vibration aging treatment of the component, the strain vibration mode of the component is used for determining the technological parameters during vibration aging treatment, and the strain vibration mode is more sensitive to microscopic defects of the component relative to the displacement vibration mode, so that the determined vibration aging technological parameters on the basis are more beneficial to obtaining the ideal effect of eliminating residual stress by vibration aging, and meanwhile, the time for vibration aging treatment of the component is determined by adopting the change rule of monitoring the strain waveform of the component.
Drawings
FIG. 1 is a schematic diagram of a green intelligent vibratory stress relief system.
Detailed Description
The invention is further described with reference to the accompanying drawings:
the green intelligent vibration aging system comprises an upper computer system, a signal generator, a driver, a vibration exciter, a strain sensor, a dynamic strain gauge, an acceleration sensor, a charge amplifier, an oscilloscope, a data acquisition card and a supporting device; the vibration exciter is fixed on the surface of a component, and the component is supported by adopting an elastic supporting device; the upper computer system control signal generator outputs a sine excitation signal with independent amplitude and frequency and continuously adjustable; the sinusoidal excitation signal output by the signal generator is input to the vibration exciter through the driver, and the vibration exciter is driven to generate vibration; the acceleration sensor is arranged on the component, the output end of the acceleration sensor is connected with the input end of the charge amplifier, the output end of the charge amplifier is connected with the input end of the oscilloscope, and the output end of the oscilloscope is connected with the input end of the data acquisition card; the strain sensor is stuck on the component, the outgoing line of the strain sensor is connected with the input end of the dynamic strain gauge, and the output end of the dynamic strain gauge is connected with the input end of the data acquisition card; the output end of the data acquisition card is connected with the upper computer system.
The upper computer system comprises a strain waveform acquisition module for acquiring a strain waveform acquired by a dynamic strain gauge, a strain peak value extraction module for extracting a strain peak value epsilon (mu epsilon) from the strain waveform, a dynamic stress conversion module for converting the extracted strain peak value into exciting dynamic stress, a component elastic modulus setting module, a voltage waveform acquisition module for acquiring a voltage waveform displayed by an oscilloscope, and a voltage peak value extraction module for extracting a voltage peak value U (V) from the voltage waveform.
The elastic modulus setting module of the component is preset with the elastic modulus E (GPa) of the component; the conversion relation between the excitation stress and the strain peak value is thatWherein sigma d And the vibration stress is displayed to a user through a display interface in the upper computer system.
Further, the supporting device is an elastic element.
Further, the acceleration sensor is a piezoelectric acceleration sensor.
The green intelligent vibration aging method comprises the following steps:
(1) The upper computer system is pre-provided with finite element numerical simulation software, a three-dimensional finite element model of the component is built by adopting the finite element numerical simulation software, and the actual processing and manufacturing process of the component is simulated to obtain the surface residual stress distribution state of the component; carrying out numerical mode analysis on the component to obtain the strain vibration mode and the natural frequency of each step of the component;
(2) Determining the area where the larger residual stress of the component is located according to the distribution state of the residual stress on the surface of the component obtained by numerical simulation analysis; root of Chinese characterDetermining the region where the larger strain of each stage of strain vibration mode is located according to the strain vibration mode of each stage of the component obtained by numerical mode analysis; selecting a strain vibration mode when the area where the larger strain of the strain vibration mode is located is consistent with the area where the larger residual stress is located as an effective vibration mode during vibration aging treatment, and taking the natural frequency corresponding to the strain vibration mode as a reference frequency during frequency sweep treatment and recording as f r (Hz)；
(3) Determining the positions of the vibration peak value and the vibration node of the component according to the effective vibration mode determined in the step (2); fixing the vibration exciter at the vibration peak position of the component; supporting the component by adopting an elastic supporting device at the vibration node of the component so as to facilitate the vibration exciter to excite the component; the acceleration sensor is installed in the area where the larger residual stress of the component is located; adhering a strain sensor to the area where the larger residual stress of the component is located; connecting a signal connection line; switching on a power supply;
(4) Setting the elastic modulus E (GPa) of the member in the member elastic modulus setting module; the strain waveform acquisition module acquires a strain waveform acquired by the dynamic strain gauge; the strain peak value extraction module extracts a strain peak value epsilon (mu epsilon) from the strain waveform; the conversion relation between the vibration stress and the strain peak value output in the vibration stress conversion module is thatAnd display to the user through the display interface in the upper computer system;
(5) The reference frequency f determined according to step (2) r (Hz), determination of 0.8f r (Hz) as the initial excitation frequency of the sweep frequency vibration, starting to carry out the sweep frequency vibration on the component, and obtaining the frequency with the maximum vibration amplitude of the component as the excitation frequency f during the vibration aging treatment;
(6) Performing fixed-frequency vibration aging treatment on the component at the determined excitation frequency f, and determining the vibration stress of the component during the vibration aging treatment according to the distribution state of the residual stress on the surface of the component obtained by the numerical simulation analysis in the step (1) and the vibration stress on the component obtained by the test in the step (4);
(7) And when the member is subjected to fixed-frequency vibration aging treatment at the determined excitation frequency f, acquiring peak values of the strain signals at intervals of delta t, and when the peak values of the strain signals are kept unchanged, cutting off the power supply to stop the vibration aging treatment of the member.
Further, the finite element numerical simulation software is ANSYS finite element software.
Further, the signal connection line comprises a signal connection line between the upper computer system and the signal generator; a signal connection between the signal generator and the driver; a signal connection line between the driver and the vibration exciter; a signal connection between the strain sensor and the dynamic strain gauge; a signal connection line between the dynamic strain gauge and the data acquisition card; a signal connection between the acceleration sensor and the charge amplifier; a signal connection between the charge amplifier and the oscilloscope; a signal connection line between the oscilloscope and the data acquisition card; a signal connection line between the data acquisition card and the upper computer system; the power supply comprises an upper computer system, a signal generator, a driver, a vibration exciter, a dynamic strain gauge, a charge amplifier, an oscilloscope and a power supply of a data acquisition card.
Further, the reference frequency f determined according to step (2) in step (5) r (Hz), determination of 0.8f r (Hz) as an initial excitation frequency of the swept frequency vibration, starting the swept frequency vibration of the member, and obtaining a frequency with the maximum vibration amplitude of the member as an excitation frequency f in the vibration aging treatment, wherein the method comprises the following steps:
(5.1) initial excitation frequency f of the swept frequency vibration 1 Set to 0.8f r (Hz) and then gradually increasing the frequency of the swept vibration in steps of 10 Hz; the voltage waveform acquisition module in the upper computer system records the voltage waveform displayed by the oscillograph at each excitation frequency respectively, and the voltage peak value extraction module in the upper computer system extracts the peak value of the voltage waveform displayed by the oscillograph at each excitation frequency to obtain the frequency when the voltage peak value is maximum and records as f 11 ；
(5.2) setting the initial excitation frequency of the swept vibration to (f 11 -10) Hz, step-wise increasing the frequency of the sweep vibration with 1Hz step-wise; then repeating the step (5.1)The process is to obtain the frequency when the voltage peak is maximum and record as f 12 Namely the excitation frequency f during the vibration aging treatment.
Further, the voltage peaks are used to characterize the amplitude of vibration acting on the component.
The sensitivity value of the acceleration sensor is s (pC/ms -2 ) The sensitivity coefficient of the input end of the charge amplifier is S (pC/Unit), the amplification coefficient is F (Unit/V), the conversion relation between the acceleration vibration level and the voltage peak value acting on the component isThe voltage peak value is used for representing the vibration amplitude acting on the component, and the voltage peak value is used for representing the vibration amplitude acting on the component, so that the processing workload of an upper computer system can be reduced, and the operation efficiency of the whole green intelligent vibration aging system is improved.
Further, the determination of the vibration stress in the step (6) is based on that the sum of the amplitude of the vibration stress generated by the vibration exciter and the peak residual stress obtained by the numerical simulation analysis is larger than the yield strength of the component, and the amplitude of the vibration stress generated by the vibration exciter is smaller than the fatigue limit of the component.
Further, the interval Δt in the step (7) is 1min.
The embodiments described in the present specification are merely examples of implementation forms of the inventive concept, and the scope of protection of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, and the scope of protection of the present invention and equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.
Claims (11)
1. The method for carrying out vibration aging treatment by using the green intelligent vibration aging system comprises an upper computer system, a signal generator, a driver, a vibration exciter, a strain sensor, a dynamic strain gauge, an acceleration sensor, a charge amplifier, an oscilloscope, a data acquisition card and a supporting device; the vibration exciter is fixed on the surface of a component, and the component is supported by adopting an elastic supporting device; the upper computer system control signal generator outputs a sine excitation signal with independent amplitude and frequency and continuously adjustable; the sinusoidal excitation signal output by the signal generator is input to the vibration exciter through the driver, and the vibration exciter is driven to generate vibration; the acceleration sensor is arranged on the component, the output end of the acceleration sensor is connected with the input end of the charge amplifier, the output end of the charge amplifier is connected with the input end of the oscilloscope, and the output end of the oscilloscope is connected with the input end of the data acquisition card; the strain sensor is stuck on the component, the outgoing line of the strain sensor is connected with the input end of the dynamic strain gauge, and the output end of the dynamic strain gauge is connected with the input end of the data acquisition card; the output end of the data acquisition card is connected with an upper computer system, and the method is characterized by comprising the following steps:
(1) The upper computer system is pre-provided with finite element numerical simulation software, a three-dimensional finite element model of the component is built by adopting the finite element numerical simulation software, and the actual processing and manufacturing process of the component is simulated to obtain the surface residual stress distribution state of the component; carrying out numerical mode analysis on the component to obtain the strain vibration mode and the natural frequency of each step of the component;
(2) Determining the area where the larger residual stress of the component is located according to the distribution state of the residual stress on the surface of the component obtained by numerical simulation analysis; determining the region where the larger strain of each stage of strain vibration mode is located according to the strain vibration mode of each stage of the component obtained by numerical mode analysis; selecting a strain vibration mode when the area where the larger strain of the strain vibration mode is located is consistent with the area where the larger residual stress is located as an effective vibration mode during vibration aging treatment, and taking the natural frequency corresponding to the strain vibration mode as a reference frequency during frequency sweep treatment and recording as f r (Hz)；
(3) Determining the positions of the vibration peak value and the vibration node of the component according to the effective vibration mode determined in the step (2); fixing the vibration exciter at the vibration peak position of the component; supporting the component by adopting an elastic supporting device at the vibration node of the component so as to facilitate the vibration exciter to excite the component; the acceleration sensor is installed in the area where the larger residual stress of the component is located; adhering a strain sensor to the area where the larger residual stress of the component is located; connecting a signal connection line; switching on a power supply;
(4) Setting the elastic modulus E (GPa) of the member in the member elastic modulus setting module; the strain waveform acquisition module acquires a strain waveform acquired by the dynamic strain gauge; the strain peak value extraction module extracts a strain peak value epsilon (mu epsilon) from the strain waveform; the conversion relation between the vibration stress and the strain peak value output in the vibration stress conversion module is thatAnd display to the user through the display interface in the upper computer system;
(5) The reference frequency f determined according to step (2) r (Hz), determination of 0.8f r (Hz) as the initial excitation frequency of the sweep frequency vibration, starting to carry out the sweep frequency vibration on the component, and obtaining the frequency with the maximum vibration amplitude of the component as the excitation frequency f during the vibration aging treatment;
(6) Performing fixed-frequency vibration aging treatment on the component at the determined excitation frequency f, and determining the vibration stress of the component during the vibration aging treatment according to the distribution state of the residual stress on the surface of the component obtained by the numerical simulation analysis in the step (1) and the vibration stress on the component obtained by the test in the step (4);
(7) And when the member is subjected to fixed-frequency vibration aging treatment at the determined excitation frequency f, acquiring peak values of the strain signals at intervals of delta t, and when the peak values of the strain signals are kept unchanged, cutting off the power supply to stop the vibration aging treatment of the member.
2. The method of claim 1, wherein: the upper computer system comprises a strain waveform acquisition module for acquiring a strain waveform acquired by a dynamic strain gauge, a strain peak value extraction module for extracting a strain peak value epsilon (mu epsilon) from the strain waveform, a dynamic stress conversion module for converting the extracted strain peak value into exciting dynamic stress, a component elastic modulus setting module, a voltage waveform acquisition module for acquiring a voltage waveform displayed by an oscilloscope, and a voltage peak value extraction module for extracting a voltage peak value U (V) from the voltage waveform.
3. The method of claim 1, wherein: the elastic modulus setting module of the component is preset with the elastic modulus E (GPa) of the component; the conversion relation between the excitation stress and the strain peak value is thatWherein sigma d And the vibration stress is displayed to a user through a display interface in the upper computer system.
4. The method of claim 1, wherein: the supporting device is an elastic element.
5. The method of claim 1, wherein: the acceleration sensor is a piezoelectric acceleration sensor.
6. The method of claim 1, wherein: the finite element numerical simulation software is ANSYS finite element software.
7. The method of claim 1, wherein: the signal connection line comprises a signal connection line between the upper computer system and the signal generator; a signal connection between the signal generator and the driver; a signal connection line between the driver and the vibration exciter; a signal connection between the strain sensor and the dynamic strain gauge; a signal connection line between the dynamic strain gauge and the data acquisition card; a signal connection between the acceleration sensor and the charge amplifier; a signal connection between the charge amplifier and the oscilloscope; a signal connection line between the oscilloscope and the data acquisition card; a signal connection line between the data acquisition card and the upper computer system; the power supply comprises an upper computer system, a signal generator, a driver, a vibration exciter, a dynamic strain gauge, a charge amplifier, an oscilloscope and a power supply of a data acquisition card.
8. The method of claim 1, wherein: the reference frequency f determined according to step (2) in step (5) r (Hz), determination of 0.8f r (Hz) as an initial excitation frequency of the swept frequency vibration, starting the swept frequency vibration of the member, and obtaining a frequency with the maximum vibration amplitude of the member as an excitation frequency f in the vibration aging treatment, wherein the method comprises the following steps:
(5.1) initial excitation frequency f of the swept frequency vibration 1 Set to 0.8f r (Hz) and then gradually increasing the frequency of the swept vibration in steps of 10 Hz; the voltage waveform acquisition module in the upper computer system records the voltage waveform displayed by the oscillograph at each excitation frequency respectively, and the voltage peak value extraction module in the upper computer system extracts the peak value of the voltage waveform displayed by the oscillograph at each excitation frequency to obtain the frequency when the voltage peak value is maximum and records as f 11 ；
(5.2) setting the initial excitation frequency of the swept vibration to (f 11 -10) Hz, step-wise increasing the frequency of the sweep vibration with 1Hz step-wise; then repeating the process of the step (5.1) to obtain the frequency when the voltage peak value is maximum, and marking as f 12 Namely the excitation frequency f during the vibration aging treatment.
9. The method of claim 2, wherein: the voltage peaks are used to characterize the amplitude of vibration acting on the component.
10. The method of claim 1, wherein: the determination of the vibration stress in the step (6) is based on the fact that the sum of the amplitude of the vibration stress generated by the vibration exciter and the peak residual stress obtained by numerical simulation analysis is larger than the yield strength of the component, and meanwhile, the amplitude of the vibration stress generated by the vibration exciter is smaller than the fatigue limit of the component.
11. The method of claim 1, wherein: the interval Δt in the step (7) is 1min.
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