Vibration fatigue life prediction method and system of generator end cover, electronic equipment and storage medium

Abstract

The invention discloses a vibration fatigue life prediction method and system of a generator end cover, electronic equipment and a storage medium. The vibration fatigue life prediction method of the generator end cover comprises the following steps: acquiring each order of dominant frequency of the generator end cover; the failure cycle index of the generator end cover is obtained through a test, the preset multiple of the main frequency of any order of the generator end cover serves as the center frequency, acceleration excitation of different magnitudes is applied to the generator end cover, and the equivalent stress of the generator end cover is obtained; performing curve fitting on the failure cycle index and the equivalent stress, and determining a stress-life curve of the generator end cover; and determining the random vibration fatigue damage amount of the generator end cover according to the stress-life curve, and predicting the random vibration fatigue life of the generator end cover according to the random vibration fatigue damage amount of the generator end cover. According to the method, the stress-life curve of the generator end cover is not influenced by the change of the damping-damping ratio, and the efficiency of predicting the vibration fatigue life of the generator end cover can be improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of generators, and in particular, to a method, a system, an electronic device, and a storage medium for predicting the vibration fatigue life of a generator end cover. Background Art

[0002] Electronic products often undergo a series of different vibration loads during manufacturing, transportation, and service. In particular, the service environments of avionics systems and automotive electronic systems are more severe, and vibration failure is one of the important factors affecting the reliability of electronic products.

[0003] In the prior art, usually with the first-order main frequency of the electronic product as the center frequency, different magnitudes of acceleration excitations are applied respectively to perform harmonic response simulation analysis, and the stress responses of the solder joints under different magnitudes of gravitational acceleration excitations are obtained respectively, and finally the stress-life curve of the solder joints of the electronic product is obtained. However, in this method, the stress value of the solder joint is affected by the damping ratio. When the damping ratio changes, the simulated stress value changes accordingly, and then the final stress-life curve also changes. And the same type of electronic products may also have different damping ratios due to differences in parts, resulting in different stress-life curves for the same type of electronic products. Therefore, when the existing method is used to predict the vibration fatigue life of the same type of electronic products, the accuracy of the obtained life prediction results is relatively low. Summary of the Invention

[0004] The present invention provides a method, a system, an electronic device, and a storage medium for predicting the vibration fatigue life of a generator end cover, so as to realize the prediction of the vibration fatigue life of the generator end cover, and can improve the accuracy of the prediction results and the efficiency of predicting the vibration fatigue life of the generator end cover.

[0005] In a first aspect, an embodiment of the present invention provides a method for predicting the vibration fatigue life of a generator end cover, the method including:

[0006] Obtain the main frequencies of each order of the generator end cover;

[0007] Obtain the number of failure cycles of the generator end cover through experiments, and in finite element analysis, with a preset multiple of any main frequency of the generator end cover as the center frequency, apply different magnitudes of acceleration excitations to the generator end cover respectively to obtain the equivalent stress of the generator end cover;

[0008] Perform curve fitting on the number of failure cycles and the equivalent stress to determine the stress-life curve of the generator end cover;

[0009] Determine the damage amount of the random vibration fatigue of the generator end cover according to the stress-life curve, and predict the random vibration fatigue life of the generator end cover according to the damage amount of the random vibration fatigue of the generator end cover.

[0010] In a second aspect, an embodiment of the present invention further provides a system for predicting the vibration fatigue life of a generator end cover. The system for predicting the vibration fatigue life of a generator end cover is used to execute the method for predicting the vibration fatigue life of a generator end cover according to any embodiment of the present invention. The system for predicting the vibration fatigue life of a generator end cover includes:

[0011] An acquisition module, configured to acquire the main frequencies of each order of the generator end cover;

[0012] An excitation module, configured to obtain the number of failure cycles of the generator end cover through experiments, and in finite element analysis, apply acceleration excitations of different magnitudes to the generator end cover with the preset multiples of any order main frequency of the generator end cover as the center frequencies to obtain the equivalent stress of the generator end cover;

[0013] A curve fitting module, configured to perform curve fitting on the number of failure cycles and the equivalent stress to determine the stress-life curve of the generator end cover;

[0014] A life prediction module, configured to determine the damage amount of the random vibration fatigue of the generator end cover according to the stress-life curve, and predict the random vibration fatigue life of the generator end cover according to the damage amount of the random vibration fatigue of the generator end cover.

[0015] In a third aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes:

[0016] At least one processor; and

[0017] A memory communicatively connected to the at least one processor; wherein,

[0018] The memory stores a computer program executable by the at least one processor, and when the computer program is executed by the at least one processor, the at least one processor is enabled to execute the method for predicting the vibration fatigue life of a generator end cover according to any embodiment of the present invention.

[0019] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to execute the method for predicting the vibration fatigue life of a generator end cover according to any embodiment of the present invention when executed.

[0020] The present invention provides a method, system, electronic device and storage medium for predicting the vibration fatigue life of a generator end cover. By obtaining the main frequencies of each order of the generator end cover; obtaining the failure cycle number of the generator end cover through experiments, and in finite element analysis, using a preset multiple of any main frequency of the generator end cover as the center frequency, applying acceleration excitations of different magnitudes to the generator end cover respectively to obtain the equivalent stress, so that the equivalent stress of the generator end cover is not affected by the change of the damping ratio; performing curve fitting on the failure cycle number and the equivalent stress to determine the stress-life curve of the generator end cover, so that the stress-life curve of the generator end cover is not affected by the change of the damping ratio, and the vibration fatigue life prediction of the same type of generator end cover can be realized; determining the damage amount of the random vibration fatigue of the generator end cover according to the stress-life curve, and predicting the random vibration fatigue life of the generator end cover according to the damage amount of the random vibration fatigue of the generator end cover, so that the accuracy of the random vibration fatigue life result of the generator end cover can be improved, and it is more in line with the actual application situation of the generator end cover. Description of the Drawings

[0021] Figure 1 It is a flowchart of a method for predicting the vibration fatigue life of a generator end cover provided by an embodiment of the present invention;

[0022] Figure 2 It is a schematic flowchart of curves of vibration transmissibility corresponding to different frequency ratios of multiple vibration devices provided by an embodiment of the present invention;

[0023] Figure 3 It is a flowchart of determining the failure cycle number and the equivalent stress of the generator end cover provided by an embodiment of the present invention;

[0024] Figure 4 It is a flowchart of another method for predicting the vibration fatigue life of a generator end cover provided by an embodiment of the present invention;

[0025] Figure 5 It is a schematic structural diagram of a system for predicting the vibration fatigue life of a generator end cover in an embodiment of the present invention;

[0026] Figure 6 It is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. Detailed Embodiments

[0027] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings, rather than all the structures.

[0028] An embodiment of the present invention provides a method for predicting the vibration fatigue life of a generator end cover. This embodiment is applicable to the application scenario of predicting the vibration fatigue life of a generator end cover, so that the obtained stress-life curve of the generator end cover is constant and not affected by the change of damping ratio. This method can be executed by a vibration fatigue life prediction system for the generator end cover, and the vibration fatigue life prediction system for the generator end cover can be implemented in the form of hardware and / or software. Figure 1 It is a flowchart of a method for predicting the vibration fatigue life of a generator end cover provided by an embodiment of the present invention. As Figure 1 shown, the method for predicting the vibration fatigue life of a generator end cover includes:

[0029] S110. Obtain the main frequencies of each order of the generator end cover.

[0030] Specifically, through static simulation experiments on the generator end cover, the main frequencies of each order and the vibration modes of the generator end cover can be obtained. The main frequencies of each order are the natural frequencies of the generator end cover. In addition, through vibration dynamic tests on the generator end cover in the range of 0 - 1000 Hz, the main frequencies of each order of the generator end cover can also be measured.

[0031] S120. Obtain the failure cycle number of the generator end cover through experiments, and in finite element analysis, apply acceleration excitations of different magnitudes to the generator end cover with the preset multiple of any main frequency of the generator end cover as the center frequency to obtain the equivalent stress of the generator end cover.

[0032] Among them, since there may be differences in the damping ratios of generator end covers of the same model, in order to implement the vibration fatigue life prediction method for products of the same type through this method, it is possible to determine the vibration transfer rate curves of generator end covers with different damping ratios at different frequency ratios. The frequency ratio is the ratio of the excitation frequency received by the generator end cover to the natural frequency. Then, determine the intersection points of the vibration transfer rate curves of generator end covers with different damping ratios at different frequency ratios. The frequency ratio at this intersection point is the preset multiple. At this intersection point, the stress response of the generator end cover is independent of the damping ratio. Regardless of the damping ratio, the finally calculated stress-life curve of the generator end cover is unique. Therefore, in the vibration fatigue life prediction method of the embodiment of the present invention, acceleration excitation is not applied at any main frequency, but at the preset multiple of any main frequency, and the corresponding stress is also applied at the preset multiple of the corresponding main frequency during harmonic response analysis. In this way, the obtained stress-life curve is constant and not affected by the damping ratio.

[0033] Specifically, taking the preset multiples of any order of the main frequency of the generator end cover as the center frequencies, different magnitudes of acceleration excitations are applied to the generator end cover respectively to obtain the failure cycle times and equivalent stresses of the generator end cover. For example, each order of the main frequency of the generator end cover includes the first-order main frequency. By taking the preset multiples of the first-order main frequency as the center frequencies and applying different magnitudes of acceleration excitations respectively to conduct a sine vibration test, record the failure times of the generator end cover under different magnitudes of acceleration excitations, and calculate the failure cycle times of the generator end cover; by taking the preset multiples of the first-order main frequency as the center frequencies and applying different magnitudes of acceleration excitations corresponding to the sine vibration test to conduct a harmonic response simulation analysis, obtain the stress responses of the generator end cover under different magnitudes of acceleration excitations respectively, and calculate the equivalent stresses. Moreover, the equivalent stress of the generator end cover is not affected by the change of the damping ratio of the generator end cover. Thus, the stress-life curve of the generator end cover is determined through the failure cycle times and equivalent stresses, thereby realizing the prediction of the vibration fatigue life of the same type of generator end cover and improving the efficiency of predicting the vibration fatigue life of the generator end cover.

[0034] S130. Conduct curve fitting on the failure cycle times and equivalent stresses to determine the stress-life curve of the generator end cover.

[0035] Among them, the stress-life curve takes the fatigue strength of the material standard specimen as the ordinate and the logarithm of the fatigue life lg N as the abscissa, representing the relationship between the fatigue strength and fatigue life of the standard specimen under a certain cyclic characteristic.

[0036] Specifically, according to the failure cycle times of the generator end cover obtained from the sine test under different magnitudes of acceleration excitations and the equivalent stresses of the generator end cover obtained from the harmonic response analysis, conduct curve fitting analysis on the failure cycle times and equivalent stresses to determine the stress-life curve of the generator end cover. Since the obtained failure cycle times and equivalent stresses are the stresses corresponding to applying acceleration excitations at the preset multiples of any order of the main frequency and also applying acceleration excitations at the preset multiples of the corresponding order of the main frequency during the harmonic response analysis, the equivalent stress of the generator end cover is not affected by the change of the damping ratio of the generator end cover. Thus, the stress-life curve of the generator end cover is not affected by the change of the damping ratio.

[0037] S140. Determine the damage amount of the random vibration fatigue of the generator end cover according to the stress-life curve, and predict the random vibration fatigue life of the generator end cover according to the damage amount of the random vibration fatigue of the generator end cover.

[0038] Specifically, the linear cumulative damage theory (Palmgren-Miner, hereinafter referred to as Miner theory) can be combined to determine the damage amount of the random vibration fatigue of the generator end cover. The linear cumulative damage theory means that under cyclic loading, the relationship between fatigue damage and the number of load cycles is linear, and fatigue damage can be linearly accumulated. Each stress is independent and unrelated to each other, and the damage increased after each cycle can be simply superimposed for fatigue life assessment. When the accumulated damage reaches a certain value, the specimen or component undergoes fatigue failure. The success of the linear cumulative damage theory lies in that a large number of experimental results show that the mean value of the linear cumulative damage index CDI is indeed close. Therefore, based on the linear cumulative damage theory, it is possible to determine the damage amount of the random vibration fatigue of the generator end cover according to the stress-life curve. Based on the Miner criterion, the random vibration fatigue life of the generator end cover can also be predicted according to the damage amount of the random vibration fatigue of the generator end cover, thereby improving the accuracy of the random vibration fatigue life result of the generator end cover and making it more in line with the actual application situation of the generator end cover.

[0039] An embodiment of the present invention provides a method for predicting the vibration fatigue life of a generator end cover. By obtaining the main frequencies of each order of the generator end cover; obtaining the failure cycle number of the generator end cover through experiments, and in finite element analysis, taking a preset multiple of any main frequency of the generator end cover as the center frequency, applying acceleration excitations of different magnitudes to the generator end cover respectively to obtain the equivalent stress of the generator end cover, so that the equivalent stress of the generator end cover is not affected by the change of the damping ratio; performing curve fitting on the failure cycle number and the equivalent stress to determine the stress-life curve of the generator end cover, so that the stress-life curve of the generator end cover is not affected by the change of the damping ratio, and the efficiency of predicting the vibration fatigue life of the generator end cover can be improved; determining the damage amount of the random vibration fatigue of the generator end cover according to the stress-life curve, and predicting the random vibration fatigue life of the generator end cover according to the damage amount of the random vibration fatigue of the generator end cover, thereby improving the accuracy of the random vibration fatigue life result of the generator end cover and making it more in line with the actual application situation of the generator end cover.

[0040] In an embodiment of the present invention, optionally, the preset multiple is times.

[0041] Specifically, Figure 2 is a schematic flow chart of the curves of the vibration transfer ratios corresponding to different frequency ratios of multiple vibration devices provided by an embodiment of the present invention. As Figure 2 shown, multiple vibration devices have different damping ratios. The vibration transfer ratio (TR) refers to the ratio of the vibration input to the output. The vibration transfer ratio (TR) is usually used to describe the amplification or attenuation effect of a system on vibration. The calculation of the vibration transfer ratio (TR) usually involves vibration parameters of the input and output, such as acceleration, velocity or displacement. ξ is the damping ratio, which isFigure 2 It can be seen that due to the existence of damping, the variation of the vibration transmissibility with frequency is continuous, and regardless of the magnitude of the damping ratio, all transmissibility curves intersect at the frequency ratio of . Then, in the case of the frequency ratio of , the stress response of the vibration device is independent of the damping ratio. The frequency ratio of the vibration device is the ratio of the excitation frequency to the natural frequency, that is, the ratio of the excitation frequency to the natural frequency is The stress response is independent of the damping ratio. Regardless of the damping ratio, the stress-life curve of the vibration device is unique. Therefore, the embodiment of the present invention improves the random vibration fatigue life prediction method in the prior art. By setting the preset multiple to times, instead of applying acceleration excitation at the first-order main frequency of the generator end cover, acceleration excitation is applied at times of the first-order main frequency of the generator end cover, and during the harmonic response analysis, the stress corresponding to the acceleration excitation applied at times of the first-order main frequency of the generator end cover is also used. In this way, the stress-life curve of the generator end cover obtained is constant and is not affected by the change of the damping ratio of the generator end cover, so as to realize the vibration fatigue life prediction of the generator end covers of the same type and improve the efficiency of the vibration fatigue life prediction of the generator end cover.

[0042] In the embodiment of the present invention, not only can acceleration excitation be applied at times of the first-order main frequency of the generator end cover, but also the acceleration excitation of different magnitudes can be applied to the generator end cover with the times of any order main frequency of the generator end cover as the center frequency, and the failure cycle number and equivalent stress of the generator end cover are obtained, so that the equivalent stress of the generator end cover is not affected by the change of the damping ratio, and thus the stress-life curve of the generator end cover is not affected by the change of the damping ratio.

[0043] By comparing with the random vibration fatigue life prediction method in the prior art, by the method of the prior art, for the generator end covers with different damping ratios, when acceleration excitation is applied at the first-order main frequency, the first-order main frequency is 225 Hz. For the generator end cover with a damping ratio of 0.03, the stress at the dangerous position of the generator end cover is 153 MPa. For the generator end cover with a damping ratio of 0.04, the stress at the dangerous position of the generator end cover is 115 MPa. For the generator end cover with a damping ratio of 0.05, the stress at the dangerous position of the generator end cover is 92 MPa; when acceleration excitation is applied at times of the first-order main frequency, The multiple is 318 Hz. For the generator end cover with a damping ratio of 0.03, the stress at the dangerous position of the generator end cover is 8.5 MPa. For the generator end cover with a damping ratio of 0.04, the stress at the dangerous position of the generator end cover is 8.5 MPa. For the generator end cover with a damping ratio of 0.05, the stress at the dangerous position of the generator end cover is 8.5 MPa. It can be seen that at the resonance frequency, by the vibration fatigue life prediction method of the embodiment of the present invention, the stress obtained by the generator end cover is not affected by the damping stress value. However, for the method of the prior art, the stress value is affected by the damping ratio. When the damping ratio changes, the simulated stress value changes accordingly, and then the final stress-life curve will also change. Therefore, by taking the multiple of any order main frequency of the generator end cover as the center frequency, applying acceleration excitations of different magnitudes to the generator end cover respectively, obtaining the failure cycle number and equivalent stress of the generator end cover, in the obtained vibration fatigue life prediction result, the stress-life curve is constant and not affected by the damping ratio, which can improve the efficiency of vibration fatigue life prediction for the generator end cover and improve the accuracy of the life prediction result, and is more in line with the actual application situation.

[0044] Optionally, Figure 3 is the flow chart for determining the failure cycle number and equivalent stress of the generator end cover provided by the embodiment of the present invention. As Figure 3 shown, the process of determining the failure cycle number and equivalent stress of the generator end cover includes:

[0045] S210. Taking the preset multiple of any order main frequency of the generator end cover as the center frequency, applying acceleration excitations of different magnitudes to the generator end cover respectively, conducting a sine vibration test, obtaining the failure time of the generator end cover under different magnitudes of acceleration excitations, and calculating the failure cycle number of the generator end cover.

[0046] Among them, a modal test can be first performed on the generator end cover to obtain the main frequencies of each order (such as the first-order main frequency f1, the second-order main frequency f2, the third-order main frequency f3...) and the vibration modes of the generator end cover.

[0047] Specifically, the preset multiple is times. Taking the first-order main frequency as an example of any order main frequency, in this step, the times of the first-order main frequency of the generator end cover can be used as the center frequency, applying acceleration excitations of different magnitudes to the generator end cover respectively, conducting a sine vibration test, obtaining the failure time t of the generator end cover under different magnitudes of acceleration excitations, and the failure cycle number Nf of the generator end cover can be calculated according to the following formula

[0048]

[0049] In addition, a finite element model of the generator end cover can be established to conduct modal simulation tests. Based on the main frequency and vibration mode of the modal simulation tests, the finite element model can be verified and corrected. Through the finite element model, power spectral density (PSD) simulation analysis of the random vibration signal can be carried out. According to the position of the maximum equivalent stress point, the fatigue dangerous parts of the generator end cover under random vibration can be determined.

[0050] S220. In the finite element analysis, taking a preset multiple of any order main frequency of the generator end cover as the center frequency, applying the acceleration excitation corresponding to the sine vibration test to the generator end cover, conducting harmonic response simulation analysis, respectively obtaining the stress responses of the generator end cover under different magnitudes of acceleration excitation, and calculating the equivalent stress of the generator end cover.

[0051] Specifically, the preset multiple is times. Taking the first-order main frequency as an example of any order main frequency, correspondingly, in this step, during the harmonic response analysis, the acceleration excitation is also applied at times of the first-order main frequency, and the corresponding stress response is obtained. The equivalent stress of the generator end cover is calculated by using the volume equivalent stress method. In this way, the obtained stress-life curve is constant and not affected by the damping ratio.

[0052] The embodiment of the present invention also provides another method for predicting the vibration fatigue life of the generator end cover. The embodiment of the present invention can adopt a calculation method in the frequency domain to predict the random vibration fatigue life of the generator end cover. Figure 4 is a flowchart of another method for predicting the vibration fatigue life of the generator end cover provided by the embodiment of the present invention. As Figure 4 shown, determining the damage amount of the random vibration fatigue of the generator end cover according to the stress-life curve, and predicting the random vibration fatigue life of the generator end cover according to the damage amount of the random vibration fatigue of the generator end cover, including:

[0053] S310. Obtain the power spectral density function of the generator end cover and the stress amplitude probability density function of the generator end cover in advance.

[0054] Optionally, establish the power spectral density function of the generator end cover; calculate the power spectral density moments of each order of the generator end cover according to the power spectral density function of the generator end cover; establish the stress amplitude probability density function of the generator end cover according to the power spectral density moments of each order of the generator end cover.

[0055] Specifically, if the power spectral density (PSD) function is generated through random response analysis, the i-th order spectral moment of the generator end cover is defined as: where f is the vibration load frequency and G(f) is the power spectral density function of the vibration load.

[0056] According to the above formula, the moments of the power spectral density of the generator end cover can be calculated. The moments of the power spectral density of the generator end cover can generate the probability density function of the stress range. Through any one of the DIRLIK and LALANNE models, the probability density function of the stress amplitude of the generator end cover can be established.

[0057] S320. Determine the damage amount of the random vibration fatigue of the generator end cover per unit time according to the stress-life curve, the power spectral density function of the generator end cover, and the probability density function of the stress amplitude of the generator end cover.

[0058] Optionally, establish a damage amount function of the random vibration fatigue of the generator end cover per unit time based on the stress-life curve, the power spectral density function of the generator end cover, and the probability density function of the stress amplitude of the generator end cover.

[0059] Calculate the damage amount of the random vibration fatigue of the generator end cover per unit time according to the damage amount function of the random vibration fatigue of the generator end cover per unit time.

[0060] Specifically, the stress-life curve is the S-N curve of the generator end cover. Based on the stress-life curve, the power spectral density function of the generator end cover, and the probability density function of the stress amplitude of the generator end cover, the total damage amount of the random vibration fatigue of the generator end cover within a fixed time range can be calculated. Dividing the damage amount of the random vibration fatigue by the fixed time can obtain the damage amount of the random vibration fatigue of the generator end cover per unit time. Based on this, the damage amount function of the random vibration fatigue of the generator end cover per unit time can be calculated, and the damage amount of the random vibration fatigue of the generator end cover per unit time can be calculated according to the damage amount function of the random vibration fatigue of the generator end cover per unit time. Exemplarily, the stress-life curve is expressed as:

[0061]

[0062] where N is the fatigue life of the generator end cover, k and b are the material constants of the generator end cover, and S i is the stress on the generator end cover, and N(S i ) is the fatigue life of the generator end cover at the stress level S i .

[0063] The damage amount function of the random vibration fatigue of the generator end cover per unit time is:

[0064]

[0065] Among them, D is the damage amount of the generator end cover due to random vibration fatigue per unit time, T is the reciprocal of the unit time, E(P) is the expected value of the peak frequency of the random response signal, and P(S) is the probability density function of the stress amplitude of the generator end cover.

[0066] S330. Predict the random vibration fatigue life of the generator end cover in the required time according to the damage amount of the generator end cover due to random vibration fatigue per unit time.

[0067] Specifically, according to the damage amount of the generator end cover due to random vibration fatigue per unit time, it can be judged how long it takes for the damage amount of the generator end cover to reach the maximum value, so as to predict the random vibration fatigue life of the generator end cover in the required time.

[0068] In addition, the random vibration fatigue of the generator end cover in the embodiment of the present invention can also be calculated in the time domain, and the specific process is as follows:

[0069] S410. Obtain the cycle number, stress amplitude and mean distribution of the random vibration fatigue dangerous part of the generator end cover.

[0070] Specifically, obtaining the cycle number, stress amplitude and mean distribution of the random vibration fatigue dangerous part of the generator end cover includes:

[0071] Obtain the stress-time curve of the random vibration fatigue dangerous part of the generator end cover and the life curve of the generator end cover.

[0072] According to the stress-time curve of the random vibration fatigue dangerous part of the generator end cover or the life curve of the generator end cover, use the rain flow counting method to determine the cycle number, stress amplitude and mean distribution of the random vibration fatigue dangerous part of the generator end cover.

[0073] Among them, when calculating the structural fatigue life in the time domain, it is necessary to convert the irregular load time history into a complete cyclic load. The rainflow counting method is used to sort and statistically analyze the stress amplitude and mean value of the stress-time history. The equivalent stress-time history curve is subjected to cyclic counting, and then the stress levels are sorted into load spectra of different stress levels. The main function of the rainflow counting method is to represent the measured load history data after peak-valley detection and removal of invalid amplitudes in the form of discrete load cycles. Any length of time-domain signal can be reduced to a rainflow matrix and residues, and can be restored to a continuous time-domain signal. The greatest advantage of the rainflow counting method is that the stress cycles obtained by this method are consistent with those obtained from the stress-strain hysteresis loop, which makes the fatigue life calculated from the stress cycles obtained by the rainflow counting method most realistic. Rotate the stress-time history record by 90°, with the time axis vertically downward. The data record is like a series of roofs, and the rain flows down along the roofs, so it is called the rainflow counting method. ① Rules and principles of the rainflow counting method: 1) The rainflow starts at the starting point of the test record and successively at the inner side of each peak, that is, starting from the sharp points such as 1, 2, 3, etc. and flowing downward. 2) The rainflow vertically drops at the peak (i.e., the eaves) and flows until it reaches a maximum value (or a more negative minimum value) that is more positive than the maximum value (or minimum value) at the start on the opposite side. 3) When the rainflow encounters rain flowing down from the upper roof, it stops flowing and forms a cycle. 4) Draw each cycle according to the starting and ending points of the raindrop flow, take out all the cycles one by one, and record their peaks. 5) The horizontal length of each rainflow can be used as the amplitude of the cycle. It should be noted that for the calculation process of random vibration fatigue life, the calculation is faster through the frequency-domain method, while the calculation time is longer through the time-domain method.

[0074] Specifically, by obtaining the stress-time curve of the random vibration fatigue dangerous part of the generator end cover and the life curve of the generator end cover, the life curve of the generator end cover is a curve of life varying with stress. According to the stress-time curve of the random vibration fatigue dangerous part of the generator end cover and the life curve of the generator end cover, the rainflow counting method can be used to determine the cycle number, stress amplitude, and mean value distribution of the random vibration fatigue dangerous part of the generator end cover.

[0075] Optionally, obtaining the stress-time curve of the random vibration fatigue dangerous part of the generator end cover and the life curve of the generator end cover includes:

[0076] Determine the random vibration fatigue dangerous part of the generator end cover through PSD simulation analysis of the generator end cover.

[0077] Determine the volume-weighted equivalent stress PSD curve of the random vibration fatigue dangerous part of the generator end cover.

[0078] Adopt the power spectral density time-domain reconstruction method based on the inverse discrete Fourier transform, and determine the stress-time curve of the random vibration fatigue dangerous part of the generator end cover according to the volume-weighted equivalent stress PSD curve of the random vibration fatigue dangerous part of the generator end cover.

[0079] Specifically, by establishing a finite element model of the generator end cover, conducting modal simulation tests, verifying and correcting the finite element model according to the main frequency and vibration mode of the modal simulation test, and performing random vibration PSD simulation analysis through the finite element model, the random vibration fatigue dangerous part of the generator end cover can be determined according to the position of the maximum equivalent stress point. Then, determine the volume-weighted equivalent stress PSD curve of the random vibration fatigue dangerous part of the generator end cover. Adopt the power spectral density time-domain reconstruction method based on the inverse discrete Fourier transform, and determine the stress-time curve of the random vibration fatigue dangerous part of the generator end cover according to the volume-weighted equivalent stress PSD curve of the random vibration fatigue dangerous part of the generator end cover. In addition, according to the relationship between the strain and life of the generator end cover, a life curve of the generator end cover can be established. The strain patch can be placed at a suitable position on the generator end cover, and through a short-term random vibration test directly, without performing PSD simulation analysis, the strain response of the generator end cover per unit time can be directly monitored.

[0080] S420. Determine the damage amount of the random vibration fatigue of the generator end cover according to the stress-life curve, the number of cycles at the preset position point, the stress amplitude, and the mean distribution.

[0081] Specifically, based on the Miner criterion, the random vibration fatigue life of the generator end cover can also be predicted according to the damage amount of the random vibration fatigue of the generator end cover, so as to improve the accuracy of the random vibration fatigue life result of the generator end cover and be more in line with the actual application situation of the generator end cover. The Miner criterion believes that the damage added after each cycle can be simply superimposed for the evaluation of fatigue life. In the calculation process, according to the stress-life curve, the number of cycles at the preset position point, the stress amplitude, and the mean distribution, the damage amount of the random vibration fatigue of the generator end cover in the i-th cycle can be determined.

[0082] S430. Based on the linear fatigue cumulative damage theory, predict the random vibration fatigue life of the generator end cover according to the damage amount of the random vibration fatigue of the generator end cover.

[0083] Specifically, based on the linear fatigue cumulative damage theory, the linear cumulative damage index CDI satisfies:

[0084]

[0085] Among them, CDI is the linear cumulative damage index, ΔD iLet $\Delta D_i$ be the damage amount of the $i$-th cycle of the generator end cover under random vibration fatigue, and $n$ be the number of cycles. Assume that the time-domain signal length of rainflow counting is $t$, and its corresponding total damage amount is $\sum\Delta D_i$. According to Miner's criterion, when the total damage within the random vibration time period is $CDI = 1$, the generator end cover fails. Let the failure time of the generator end cover be $T$ f , then it satisfies:

[0086]

[0087] $T$ f $= t / \sum\Delta D$ i ;

[0088] The failure time $T$ of the generator end cover can be calculated through the above formula f , and the failure time $T$ of the generator end cover f is the predicted random vibration fatigue life of the generator end cover, thus realizing the prediction of the random vibration fatigue life of the generator end cover. The entire prediction process is based on rigorous data processing, highly operable, and adopts the rainflow counting method to count and sort the cycle numbers of the stress and time response signals, ensuring the accuracy of data acquisition during the prediction process of the random vibration fatigue life of the generator end cover, that is, ensuring the accuracy of the final prediction result of the random vibration fatigue life of the generator end cover.

[0089] The embodiment of the present invention provides a method for predicting the vibration fatigue life of a generator end cover, which improves the existing method for predicting the random vibration fatigue life. By setting the preset multiple to times, instead of applying acceleration excitation at the first-order main frequency of the generator end cover, acceleration excitation is applied at the first-order main frequency or any other order of the times, and during the harmonic response analysis, the stress corresponding to the acceleration excitation applied at the first-order main frequency or any other order of the is also applied. In this way, the stress-life curve of the generator end cover obtained is constant, making the equivalent stress of the generator end cover not affected by the change in the damping ratio, and thus making the stress-life curve of the generator end cover not affected by the change in the damping ratio, realizing the prediction of the vibration fatigue life of the same type of generator end cover. In addition, the damage amount of the random vibration fatigue of the generator end cover is determined according to the stress-life curve, and the random vibration fatigue life of the generator end cover is predicted according to the damage amount of the random vibration fatigue of the generator end cover, thereby improving the accuracy of the random vibration fatigue life result of the generator end cover and being more in line with the actual application situation of the generator end cover.

[0090] The embodiment of the present invention also provides a system for predicting the vibration fatigue life of a generator end cover Figure 5The structure diagram of a vibration fatigue life prediction system for a generator end cover in an embodiment of the present invention. The vibration fatigue life prediction system for the generator end cover in the embodiment of the present invention is used to execute the vibration fatigue life prediction method for the generator end cover in any embodiment of the present invention, such as Figure 5 As shown, the vibration fatigue life prediction system for the generator end cover includes:

[0091] An acquisition module 110, configured to acquire the main frequencies of each order of the generator end cover.

[0092] An excitation module 120, configured to obtain the failure cycle number of the generator end cover through experiments, and in finite element analysis, apply acceleration excitations of different magnitudes to the generator end cover with the preset multiple of any main frequency of the generator end cover as the center frequency to obtain the equivalent stress of the generator end cover.

[0093] A curve fitting module 130, configured to perform curve fitting on the failure cycle number and the equivalent stress to determine the stress-life curve of the generator end cover.

[0094] A life prediction module 140, configured to determine the damage amount of the random vibration fatigue of the generator end cover according to the stress-life curve, and predict the random vibration fatigue life of the generator end cover according to the damage amount of the random vibration fatigue of the generator end cover.

[0095] Wherein, the preset multiple is times. The excitation module 120 does not apply acceleration excitation at the first-order main frequency of the generator end cover, but applies acceleration excitation at times the first-order main frequency of the generator end cover, and also applies the stress corresponding to the acceleration excitation at times the first-order main frequency of the generator end cover during harmonic response analysis. In this way, the obtained stress-life curve of the generator end cover is constant and not affected by the change of the damping ratio of the generator end cover. Optionally, the generator end cover is an aluminum alloy die casting.

[0096] Specifically, the acquisition module 110 can obtain the main frequencies and vibration modes of each order of the generator end cover through static simulation experiments on the generator end cover, and send them to the excitation module 120. The excitation module 120 can perform a sine vibration test by applying acceleration excitations of different magnitudes with a preset multiple of the first-order main frequency as the center frequency, record the failure time of the generator end cover under acceleration excitations of different magnitudes, and calculate the failure cycle times of the generator end cover; by applying acceleration excitations of different magnitudes corresponding to the sine vibration test with a preset multiple of the first-order main frequency as the center frequency, perform a harmonic response simulation analysis, respectively obtain the stress responses of the generator end cover under acceleration excitations of different magnitudes, and calculate the equivalent stress, and the equivalent stress of the generator end cover is not affected by the change of the damping ratio of the generator end cover. The curve fitting module 130 determines the stress-life curve of the generator end cover based on the failure cycle times and the equivalent stress, and the stress-life curve of the generator end cover is not affected by the change of the damping ratio. The life prediction module 140 determines the damage amount of the random vibration fatigue of the generator end cover according to the stress-life curve, and predicts the random vibration fatigue life of the generator end cover based on the Miner criterion according to the damage amount of the random vibration fatigue of the generator end cover, so as to improve the accuracy of the random vibration fatigue life result of the generator end cover and be more in line with the actual application situation of the generator end cover.

[0097] An embodiment of the present invention provides a system for predicting the vibration fatigue life of a generator end cover. The acquisition module 110 obtains the main frequencies of each order of the generator end cover; the excitation module 120 uses a preset multiple of any order of the main frequency of the generator end cover as the center frequency, and applies acceleration excitations of different magnitudes to the generator end cover respectively to obtain the failure cycle times and the equivalent stress of the generator end cover, so that the equivalent stress of the generator end cover is not affected by the change of the damping ratio; the curve fitting module 130 performs curve fitting on the failure cycle times and the equivalent stress to determine the stress-life curve of the generator end cover, so that the stress-life curve of the generator end cover is not affected by the change of the damping ratio; the life prediction module 140 determines the damage amount of the random vibration fatigue of the generator end cover according to the stress-life curve, and predicts the random vibration fatigue life of the generator end cover according to the damage amount of the random vibration fatigue of the generator end cover, so as to improve the accuracy of the random vibration fatigue life result of the generator end cover and be more in line with the actual application situation of the generator end cover.

[0098] Optionally, the excitation module 120 includes:

[0099] The first excitation unit is used to use a preset multiple of any order of the main frequency of the generator end cover as the center frequency, apply acceleration excitations of different magnitudes to the generator end cover respectively, perform a sine vibration test, obtain the failure time of the generator end cover under acceleration excitations of different magnitudes, and calculate the failure cycle times of the generator end cover.

[0100] A second excitation unit, which is used to, in finite element analysis, take a preset multiple of any order main frequency of the generator end cover as the center frequency, apply the acceleration excitation corresponding to a sine vibration test to the generator end cover, conduct a harmonic response simulation analysis, respectively obtain the stress responses of the generator end cover under acceleration excitations of different magnitudes, and calculate the equivalent stress of the generator end cover.

[0101] Specifically, the preset multiple in the first excitation unit is times. Taking the first-order main frequency as an example, in this step, the center frequency can be set as times the first-order main frequency of the generator end cover. Different magnitudes of acceleration excitations are respectively applied to the generator end cover to conduct a sine vibration test, and the failure time t of the generator end cover under acceleration excitations of different magnitudes can be obtained. The failure cycle number Nf of the generator end cover can be calculated according to the following formula The preset multiple in the second excitation unit is times. Taking the first-order main frequency as an example, correspondingly, the second excitation unit can also apply the stress response corresponding to the acceleration excitation at times the first-order main frequency during the harmonic response analysis. The equivalent stress of the generator end cover is calculated by using the volume equivalent stress method. In this way, the obtained stress-life curve is constant and not affected by the damping ratio.

[0102] An embodiment of the present invention provides a vibration fatigue life prediction system for a generator end cover, which improves the random vibration fatigue life prediction method in the prior art. By setting the preset multiple as times, the acceleration excitation is not applied at the first-order main frequency of the generator end cover, but at times the first-order main frequency or any other order main frequency of the generator end cover. And during the harmonic response analysis, the stress corresponding to the acceleration excitation is also applied at times the first-order main frequency or any other order main frequency of the generator end cover. In this way, the obtained stress-life curve of the generator end cover is constant, so that the equivalent stress of the generator end cover is not affected by the change of the damping ratio, and thus the stress-life curve of the generator end cover is not affected by the change of the damping ratio.

[0103] An embodiment of the present invention also provides an electronic device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the vibration fatigue life prediction method of the generator end cover in any embodiment of the present invention. Figure 6 It is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. Figure 6A block diagram of an exemplary electronic device 40 suitable for implementing the embodiments of the present invention is shown. Figure 6 The illustrated device 40 is merely an example and should not impose any limitation on the functions and scope of use of the embodiments of the present invention.

[0104] As Figure 6 shown, the device 40 is presented in the form of a general-purpose computing device. The components of the device 40 may include, but are not limited to: one or more processors or processing units 401, a system memory 402, and a bus 403 connecting different system components (including the system memory 402 and the processing unit 401).

[0105] The bus 403 represents one or more of several types of bus structures, including a memory bus or a memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus structures. By way of example, these architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.

[0106] The device 40 typically includes a variety of computer system-readable media. These media can be any available media that can be accessed by the device 40, including volatile and non-volatile media, removable and non-removable media.

[0107] The system memory 402 may include computer system-readable media in the form of volatile memory, such as random access memory (RAM) 404 and / or cache memory 405. The device 40 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, a storage system 406 can be used for reading and writing on non-removable, non-volatile magnetic media ( Figure 6 not shown, commonly referred to as a "hard disk drive"). Although Figure 6 not shown in the figure, a disk drive for reading and writing on a removable non-volatile disk (such as a "floppy disk"), and an optical disk drive for reading and writing on a removable non-volatile optical disk (such as a CD-ROM, DVD-ROM, or other optical media) can be provided. In these cases, each drive can be connected to the bus 403 through one or more data media interfaces. The memory 402 may include at least one program product having a set (such as at least one) of program modules configured to perform the functions of the embodiments of the present invention.

[0108] A program / utilities 408 having a set (at least one) of program modules 407 can be stored, for example, in a memory 402. Such program modules 407 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. The program modules 407 generally execute the functions and / or methods in the embodiments described in the present invention.

[0109] The device 40 can also communicate with one or more external devices 409 (such as a keyboard, a pointing device, a display 410, etc.), and can also communicate with one or more devices that enable a user to interact with the device 40, and / or communicate with any device that enables the device 40 to communicate with one or more other computing devices (such as a network card, a modem, etc.). Such communication can be carried out through an input / output (I / O) interface 411. Also, the device 40 can communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter 412. As shown in the figure, the network adapter 412 communicates with other modules of the device 40 through a bus 403. It should be understood that although Figure 6 not shown in the figure, other hardware and / or software modules can be used in combination with the device 40, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0110] The processing unit 401 executes various functional applications and data processing by running programs stored in the system memory 402, such as implementing the vibration fatigue life prediction method of the generator end cover provided in the embodiments of the present invention.

[0111] The embodiments of the present invention also provide a storage medium containing computer-executable instructions. The computer-readable storage medium stores computer instructions, and the computer instructions are used to cause a processor to implement the vibration fatigue life prediction method of the generator end cover in any embodiment of the present invention when executed.

[0112] The computer storage medium of the embodiments of the present invention may adopt any combination of one or more computer-readable media. The computer-readable media may be computer-readable signal media or computer-readable storage media. The computer-readable storage media may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (a non-exhaustive list) of the computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer-readable storage media may be any tangible medium that contains or stores a program, and the program may be used by or in combination with an instruction execution system, apparatus, or device.

[0113] The computer-readable signal media may include data signals propagated in a baseband or as part of a carrier wave, which carry computer-readable program codes. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal media may also be any computer-readable media other than the computer-readable storage media, and the computer-readable media may send, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device.

[0114] The program codes contained on the computer-readable media may be transmitted by any appropriate media, including but not limited to wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0115] The computer program codes for performing the operations of the embodiments of the present invention may be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program codes may be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

[0116] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for predicting the vibration fatigue life of a generator end cover, characterized in that: The method comprises: Obtaining the main frequencies of each order of the generator end cover; The number of failure cycles of the generator end cover is obtained through experiments, and in finite element analysis, different magnitudes of acceleration excitation are applied to the generator end cover with a preset multiple of any order main frequency of the generator end cover as the center frequency to obtain the equivalent stress of the generator end cover; Performing curve fitting on the number of failure cycles and the equivalent stress to determine a stress-life curve of the generator end cover; The damage amount of random vibration fatigue of the generator end cover is determined according to the stress-life curve, and the random vibration fatigue life of the generator end cover is predicted according to the damage amount of random vibration fatigue of the generator end cover.

2. The vibration fatigue life prediction method of the generator end cover according to claim 1 is characterized in that: The preset multiple is √2 times.

3. The vibration fatigue life prediction method of the generator end cover according to claim 1 is characterized in that: The failure cycle number of the generator end cover is obtained through the test, and in the finite element analysis, a preset multiple of the arbitrary order main frequency of the generator end cover is used as the center frequency, and acceleration excitations of different magnitudes are applied to the generator end cover to obtain the equivalent stress of the generator end cover, including: Taking the preset multiple of any order main frequency of the generator end cover as the center frequency, applying acceleration excitations of different magnitudes to the generator end cover respectively, performing a sinusoidal vibration test, obtaining the failure time of the generator end cover under acceleration excitations of different magnitudes, and calculating the number of failure cycles of the generator end cover; In the finite element analysis, the preset multiples of the arbitrary order main frequency of the generator end cover are taken as the center frequency, the acceleration excitation corresponding to the sinusoidal vibration test is applied to the generator end cover, and a harmonic response simulation analysis is performed to obtain the stress responses of the generator end cover under acceleration excitations of different magnitudes, and the equivalent stress of the generator end cover is calculated.

4. The vibration fatigue life prediction method of the generator end cover according to claim 1 is characterized in that: Determining the random vibration fatigue damage amount of the generator end cover according to the stress-life curve, and predicting the random vibration fatigue life of the generator end cover according to the random vibration fatigue damage amount of the generator end cover, comprises: Pre-acquire a power spectrum density function of the generator end cover and a stress amplitude probability density function of the generator end cover; determine the amount of random vibration fatigue damage of the generator end cover per unit time according to the stress-life curve, the power spectrum density function of the generator end cover and the stress amplitude probability density function of the generator end cover; The random vibration fatigue life of the generator end cover within a required time is predicted according to the amount of random vibration fatigue damage of the generator end cover within a unit time.

5. The vibration fatigue life prediction method of the generator end cover according to claim 4 is characterized in that: The pre-acquiring the power spectrum density function of the generator end cover and the stress amplitude probability density function of the generator end cover comprises: Establishing a power spectral density function of the generator end cover; Calculating the power spectral density moments of each order of the generator end cover according to the power spectral density function of the generator end cover; A stress amplitude probability density function of the generator end cover is established according to each order power spectrum density moment of the generator end cover.

6. The vibration fatigue life prediction method of the generator end cover according to claim 5, characterized in that: Determining the amount of random vibration fatigue damage of the generator end cover per unit time according to the stress-life curve, the power spectrum density function of the generator end cover, and the stress amplitude probability density function of the generator end cover comprises: Establishing a random vibration fatigue damage function of the generator end cover per unit time based on the stress-life curve, the power spectrum density function of the generator end cover and the stress amplitude probability density function of the generator end cover; The random vibration fatigue damage amount of the generator end cover per unit time is calculated according to the random vibration fatigue damage amount function of the generator end cover per unit time.

7. A vibration fatigue life prediction system for a generator end cover, characterized in that: The vibration fatigue life prediction system of the generator end cover is used to execute the vibration fatigue life prediction method of the generator end cover according to any one of claims 1 to 6 above, and the vibration fatigue life prediction system of the generator end cover comprises: An acquisition module, used for acquiring the main frequencies of each order of the generator end cover; an excitation module, for obtaining the number of failure cycles of the generator end cover through experiments, and applying acceleration excitations of different magnitudes to the generator end cover respectively with a preset multiple of any order main frequency of the generator end cover as the center frequency in a finite element analysis, so as to obtain the equivalent stress of the generator end cover; A curve fitting module, used for performing curve fitting on the number of failure cycles and the equivalent stress to determine a stress-life curve of the generator end cover; The life prediction module is used to determine the damage amount of the random vibration fatigue of the generator end cover according to the stress-life curve, and predict the random vibration fatigue life of the generator end cover according to the damage amount of the random vibration fatigue of the generator end cover.

8. The vibration fatigue life prediction system of the generator end cover according to claim 7, characterized in that: The incentive module comprises: A first excitation unit is used to apply acceleration excitations of different magnitudes to the generator end cover with the preset multiple of any order main frequency of the generator end cover as the center frequency, to perform a sinusoidal vibration test, to obtain the failure time of the generator end cover under acceleration excitations of different magnitudes, and to calculate the number of failure cycles of the generator end cover; The second excitation unit is used to apply the acceleration excitation corresponding to the sinusoidal vibration test to the generator end cover in the finite element analysis with the preset multiple of the arbitrary order main frequency of the generator end cover as the center frequency, and perform harmonic response simulation analysis to obtain the stress response of the generator end cover under acceleration excitation of different magnitudes, and calculate the equivalent stress of the generator end cover.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the vibration fatigue life prediction method for the generator end cover according to any one of claims 1-6.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the vibration fatigue life prediction method for a generator end cover according to any one of claims 1 to 6 when executed.

Images