Load equivalence method and device, computer equipment and storage medium

Abstract

The invention discloses a load equivalence method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring a whole vehicle endurance test load spectrum and an original equivalent load spectrum corresponding to a rear subframe; testing the rear subframe based on the whole vehicle durability test load spectrum, and determining a first fatigue life corresponding to the whole vehicle durability working condition; testing the rear subframe based on the original equivalent load spectrum, and determining a second fatigue life corresponding to the equivalent load working condition; and adjusting the original equivalent load spectrum corresponding to the rear auxiliary frame based on the first fatigue life corresponding to the whole vehicle durability working condition and the second fatigue life corresponding to the equivalent load working condition, and determining a target equivalent load spectrum corresponding to the rear auxiliary frame. The method is used for obtaining the target equivalent load spectrum with high correlation degree with the whole vehicle endurance test load spectrum, the purpose of improving the precision of the target equivalent load spectrum of the rear auxiliary frame is achieved, and the obtained target equivalent load spectrum can be reliable and accurate.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a load equivalence method, device, computer equipment and storage medium. Background Art

[0002] In the prior art, a bench durability test is usually performed on the rear subframe based on a single-stage or multi-stage load equivalent to the load spectrum of each stress point of the rear subframe, and then a vehicle durability test is performed on the rear subframe. This method usually results in a situation where the bench durability test corresponding to the rear subframe passes, but the vehicle durability test fails, due to the low correlation between the bench durability test and the vehicle durability test. As a result, a large amount of time and manpower and material resources are required to optimize and adjust the rear subframe in the later stage of automobile design, which not only causes a waste of resources, but also reduces the development efficiency of the rear subframe. The main reason for the low correlation between the bench durability test and the vehicle durability test is that the accuracy of the load spectrum corresponding to the rear subframe in the bench durability test is low. Therefore, how to improve the accuracy of the load spectrum corresponding to the rear subframe in the bench durability test to improve the development efficiency of the rear subframe is a technical problem that needs to be solved at present. Summary of the invention

[0003] The embodiments of the present invention provide a load equivalence method, device, computer equipment and storage medium to solve the problem of how to improve the accuracy of the load spectrum corresponding to the rear subframe in a bench durability test.

[0004] A load equivalence method, comprising:

[0005] Obtain the vehicle durability test load spectrum and original equivalent load spectrum corresponding to the rear subframe;

[0006] Testing the rear subframe based on the vehicle durability test load spectrum to determine a first fatigue life corresponding to the vehicle durability working condition;

[0007] Testing the rear subframe based on the original equivalent load spectrum to determine a second fatigue life corresponding to the equivalent load condition;

[0008] Based on the first fatigue life corresponding to the whole vehicle durability condition and the second fatigue life corresponding to the equivalent load condition, the original equivalent load spectrum corresponding to the rear subframe is adjusted to determine the target equivalent load spectrum corresponding to the rear subframe.

[0009] Preferably, the rear subframe includes at least one original stress point and at least one initial risk position; the vehicle durability working condition includes multiple test working conditions;

[0010] The testing of the rear subframe based on the vehicle durability test load spectrum to determine a first fatigue life corresponding to the vehicle durability condition includes:

[0011] Based on the vehicle durability test load spectrum corresponding to at least one of the original stress points, a simulation loading test is performed on at least one of the original stress points under multiple test conditions to determine the fatigue life of each of the initial risk positions under each of the test conditions;

[0012] The operating fatigue life of the same initial risk position under the multiple test conditions is processed to determine the first fatigue life corresponding to the same initial risk position.

[0013] Preferably, the rear subframe includes at least one original stress point and at least one initial risk position;

[0014] The testing of the rear subframe based on the original equivalent load spectrum to determine the second fatigue life corresponding to the equivalent load condition includes:

[0015] Based on the original equivalent load spectrum corresponding to at least one of the original stress points, a single simulation loading test is performed on at least one of the original stress points to determine at least one initial fatigue life corresponding to each of the initial risk positions;

[0016] At least one initial fatigue life corresponding to the same initial risk position is processed to determine a second fatigue life of each initial risk position.

[0017] Preferably, the first fatigue life corresponding to the vehicle durability condition includes a first fatigue life corresponding to at least one initial risk position;

[0018] The second fatigue life corresponding to the equivalent load condition includes the second fatigue life and the initial fatigue life corresponding to at least one initial risk position;

[0019] The adjusting the original equivalent load spectrum corresponding to the rear subframe based on the first fatigue life corresponding to the vehicle durability working condition and the second fatigue life corresponding to the equivalent load working condition to determine the target equivalent load spectrum corresponding to the rear subframe includes:

[0020] If the first fatigue life and the second fatigue life corresponding to all initial risk positions satisfy the preset fatigue life condition, the original equivalent load spectrum corresponding to the rear subframe is determined as the target equivalent load spectrum corresponding to the rear subframe;

[0021] If the first fatigue life and the second fatigue life corresponding to at least one initial risk position do not meet the preset fatigue life condition, the original equivalent load spectrum corresponding to the rear subframe is adjusted to determine the target equivalent load spectrum corresponding to the rear subframe.

[0022] Preferably, the adjusting the original equivalent load spectrum corresponding to the rear subframe to determine the target equivalent load spectrum corresponding to the rear subframe includes:

[0023] Determining a key stress point corresponding to the rear subframe based on a first fatigue life and a second fatigue life corresponding to the same initial risk position;

[0024] The original equivalent load spectrum corresponding to the key stress point is adjusted to determine the target equivalent load spectrum corresponding to the key stress point.

[0025] Preferably, determining the key stress point corresponding to the rear subframe based on the first fatigue life and the second fatigue life corresponding to the same initial risk position includes:

[0026] Determine a target risk position corresponding to the rear subframe based on a first fatigue life and a second fatigue life corresponding to each of the initial risk positions;

[0027] According to at least one initial fatigue life corresponding to each target risk position, a key stress point corresponding to the rear subframe is determined.

[0028] Preferably, the adjusting the original equivalent load spectrum corresponding to the key stress point to determine the target equivalent load spectrum corresponding to the key stress point includes:

[0029] Obtaining a fatigue life curve corresponding to the key stress point, and determining a load scaling factor corresponding to the key stress point based on the fatigue life curve;

[0030] Based on the load scaling coefficient, the original equivalent load spectrum corresponding to the key stress point is scaled to determine the target equivalent load spectrum corresponding to the key stress point.

[0031] A load equivalent device, comprising:

[0032] A load spectrum acquisition module is used to obtain the vehicle durability test load spectrum and the original equivalent load spectrum corresponding to the rear subframe;

[0033] A first fatigue life determination module tests the rear subframe based on the vehicle durability test load spectrum to determine a first fatigue life corresponding to a vehicle durability condition;

[0034] a second fatigue life determination module, testing the rear subframe based on the original equivalent load spectrum to determine a second fatigue life corresponding to the equivalent load condition;

[0035] The equivalent load spectrum adjustment module adjusts the original equivalent load spectrum corresponding to the rear subframe based on the first fatigue life corresponding to the vehicle endurance condition and the second fatigue life corresponding to the equivalent load condition, and determines a target equivalent load spectrum corresponding to the rear subframe.

[0036] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned load equivalence method when executing the computer program.

[0037] A computer-readable storage medium stores a computer program, and the computer program implements the above-mentioned load equivalence method when executed by a processor.

[0038] The above-mentioned load equivalence method, device, computer equipment and storage medium adjust the original equivalent load spectrum based on the first fatigue life corresponding to the whole vehicle durability condition and the second fatigue life corresponding to the equivalent load condition, and obtain a target equivalent load spectrum with a high correlation with the whole vehicle durability test load spectrum corresponding to the whole vehicle durability condition, so as to achieve the purpose of improving the accuracy of the target equivalent load spectrum corresponding to the rear subframe in the bench durability test, so as to improve the development efficiency of the rear subframe based on the target equivalent load spectrum. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0040] Figure 1 is a flow chart of a load equivalence method in one embodiment of the present invention;

[0041] Figure 2 is another flow chart of a load equivalence method in one embodiment of the present invention;

[0042] Figure 3 is another flow chart of a load equivalence method in one embodiment of the present invention;

[0043] Figure 4 is another flow chart of a load equivalence method in one embodiment of the present invention;

[0044] Figure 5 is another flow chart of a load equivalence method in one embodiment of the present invention;

[0045] Figure 6 is another flow chart of a load equivalence method in one embodiment of the present invention;

[0046] Figure 7 is another flow chart of a load equivalence method in one embodiment of the present invention;

[0047] Figure 8 is a schematic diagram of a load equivalent device in one embodiment of the present invention;

[0048] Fig. 9 is a schematic diagram of a computer device in one embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Since the equivalent load spectrum is used in the bench durability test of the rear subframe, while the whole vehicle durability test load spectrum is used in the whole vehicle durability test, the accuracy of the existing equivalent load spectrum is low, resulting in a low correlation between the bench durability test and the whole vehicle durability test of the rear subframe. Usually, the rear subframe passes the bench durability test but fails the whole vehicle durability test. As a result, in the later stage of automobile design, a lot of resources are consumed to adjust and optimize the rear subframe due to the durability problem of the rear subframe, and the development efficiency is low. In this embodiment, a load equivalence method is provided, which can be applied to Fig. 9 The computer equipment in the system is used to improve the accuracy of the equivalent load spectrum to increase the development efficiency of the rear subframe.

[0051] In one embodiment, if Figure 1 As shown, a load equivalence method is provided, which is applied in Fig. 9 The computer device in the example is used as an example to illustrate, including the following steps:

[0052] S101: Obtaining a vehicle durability test load spectrum and an original equivalent load spectrum corresponding to the rear subframe;

[0053] S102: testing the rear subframe based on the vehicle durability test load spectrum to determine a first fatigue life corresponding to the vehicle durability working condition;

[0054] S103: testing the rear subframe based on the original equivalent load spectrum to determine a second fatigue life corresponding to the equivalent load condition;

[0055] S104: Based on a first fatigue life corresponding to the vehicle durability condition and a second fatigue life corresponding to the equivalent load condition, an original equivalent load spectrum corresponding to the rear subframe is adjusted to determine a target equivalent load spectrum corresponding to the rear subframe.

[0056] Among them, the vehicle durability test load spectrum refers to the load spectrum corresponding to the rear subframe under the vehicle durability condition. The original equivalent load spectrum refers to the load spectrum of the pre-set rear subframe under the equivalent load condition. The vehicle durability condition refers to the condition of the vehicle durability test on the rear subframe. The equivalent load condition refers to the condition of the bench durability test on the rear subframe.

[0057] As an example, in step S101, the computer device uses a dynamic method to solve the vehicle durability test load spectrum of the rear subframe under the vehicle durability condition, and uses the damage equivalence principle to set the original equivalent load spectrum of the rear subframe under the equivalent load condition. In this example, the computer device can use a dynamic method to solve the load spectrum of the rear subframe under the vehicle durability condition, remove the loads with large differences and zero drift in the load spectrum, and obtain a more accurate vehicle durability test load spectrum.

[0058] Among them, the first fatigue life refers to the fatigue life of the rear subframe under the durability conditions of the whole vehicle.

[0059] As an example, in step S102, the computer device uses the vehicle durability test load spectrum to test the rear subframe to obtain the first fatigue life corresponding to the rear subframe under the vehicle durability condition. In this example, the computer device obtains the vehicle finite element model corresponding to the rear subframe through finite element modeling, and uses the vehicle durability test load spectrum to simulate the vehicle finite element model to obtain the fatigue life of the rear subframe under the vehicle durability condition, and determines the fatigue life as the first fatigue life, which can effectively reflect the vehicle-level durability life.

[0060] The second fatigue life refers to the fatigue life of the rear subframe under equivalent load conditions.

[0061] As an example, in step S103, the computer device uses the original equivalent load spectrum to test the rear subframe to obtain the second fatigue life of the rear subframe under the equivalent load condition. In this example, the computer device obtains the component model corresponding to the rear subframe through finite element modeling, and uses the original equivalent load spectrum to perform simulation test on the component model corresponding to the rear subframe to obtain the fatigue life of the rear subframe under the equivalent load condition, and determines the fatigue life as the second fatigue life, which can effectively reflect the component-level durability life.

[0062] Among them, the target equivalent load spectrum is the equivalent load spectrum used by the rear subframe in the bench durability test, and is used to perform the bench durability test on the rear subframe.

[0063] As an example, in step S104, the computer device analyzes and compares the first fatigue life corresponding to the vehicle durability condition and the second fatigue life corresponding to the equivalent load condition, determines the difference between the first fatigue life and the second fatigue life, and if the difference is too large, adjusts the original equivalent load spectrum corresponding to the rear subframe to obtain an adjusted target equivalent load spectrum, and the second fatigue life corresponding to the target equivalent load spectrum is less different from the first fatigue life corresponding to the vehicle durability condition. In this example, the computer device can adjust and update the original equivalent load spectrum according to a preset adjustment rule to obtain an adjusted and updated original equivalent load spectrum, and repeatedly execute step S103 to obtain the second fatigue life corresponding to the adjusted and updated original equivalent load spectrum, compare and analyze the second fatigue life with the first fatigue life, and determine whether the difference between the second fatigue life and the first fatigue life is too large, until the difference between the second fatigue life and the first fatigue life is small, and determine the updated original equivalent load spectrum corresponding to the second fatigue life as the target equivalent load spectrum to improve the accuracy of the target equivalent load spectrum. The method adjusts the original equivalent load spectrum based on the first fatigue life corresponding to the whole vehicle durability condition and the second fatigue life corresponding to the equivalent load condition, and obtains a target equivalent load spectrum with a high correlation with the whole vehicle durability test load spectrum corresponding to the whole vehicle durability condition, thereby achieving the purpose of improving the accuracy of the target equivalent load spectrum corresponding to the rear subframe in the bench durability test.

[0064] In this embodiment, based on the first fatigue life corresponding to the whole vehicle durability condition and the second fatigue life corresponding to the equivalent load condition, the original equivalent load spectrum is adjusted to obtain a target equivalent load spectrum with a high correlation with the whole vehicle durability test load spectrum corresponding to the whole vehicle durability condition, so as to improve the accuracy of the target equivalent load spectrum corresponding to the rear subframe in the bench durability test, thereby improving the accuracy of the durability test based on the target equivalent load spectrum, which helps to improve the development efficiency of the rear subframe.

[0065] In one embodiment, the rear subframe includes at least one original stress point and at least one initial risk position; and the vehicle durability working condition includes a plurality of test working conditions.

[0066] Among them, the original stress point refers to the stress point of the rear subframe. The initial risk position refers to the position in the rear subframe used to test the fatigue life. Since the position in the rear subframe used to test the fatigue life is prone to cracking risks during the durability test, the position in the rear subframe used to test the fatigue life is determined as the risk position. The test condition refers to the different working conditions under the whole vehicle state when the rear subframe is tested. Since the whole vehicle durability test of the rear subframe in the whole vehicle state is usually carried out at different vehicle speeds and / or different road conditions, different vehicle speeds and / or different road conditions constitute different test conditions. In this example, in the early stage of automobile development, the rear subframe is simulated and tested under different test conditions in order to more accurately determine the first fatigue life of the rear subframe.

[0067] In one embodiment, if Figure 2 As shown, step S102, i.e. testing the rear subframe based on the vehicle durability test load spectrum to determine the first fatigue life corresponding to the vehicle durability condition, includes:

[0068] S201: Based on a vehicle durability test load spectrum corresponding to at least one original stress point, perform a simulation loading test on at least one original stress point under multiple test conditions to determine a fatigue life of each initial risk position under each test condition;

[0069] S202: Processing the working condition fatigue life of the same initial risk position under multiple test conditions to determine a first fatigue life corresponding to the same initial risk position.

[0070] Among them, the working condition fatigue life refers to the fatigue life corresponding to the initial risk position of the rear subframe under each test condition.

[0071] As an example, in step S201, the computer device uses a vehicle durability test load spectrum corresponding to at least one original stress point, performs a simulation loading test on at least one of the original stress points under multiple test conditions, and determines the fatigue life of each initial risk position corresponding to the rear subframe under each test condition. In this example, the computer device obtains the vehicle finite element model corresponding to the rear subframe through finite element modeling, uses the vehicle durability test load spectrum corresponding to each original stress point, and performs a simulation loading test on each original stress point in the vehicle finite element model corresponding to the rear subframe under each test condition, and determines the fatigue life of each initial risk position in the vehicle finite element model corresponding to the rear subframe under each test condition.

[0072] For example, the original stress points include point A and point B, the initial risk positions include position C and position D, and the test conditions include condition E and condition F. Under condition E, the computer equipment uses the vehicle durability test load spectrum corresponding to point A and the vehicle durability test load spectrum corresponding to point B to simulate loading tests on points A and B in the vehicle finite element model corresponding to the rear subframe, and obtains the fatigue life of the condition corresponding to position C under condition E and the fatigue life of the condition corresponding to position D under condition E. Similarly, under condition F, the computer equipment uses the vehicle durability test load spectrum corresponding to point A and the vehicle durability test load spectrum corresponding to point B to simulate loading tests on points A and B in the vehicle finite element model corresponding to the rear subframe, and obtains the fatigue life of the condition corresponding to position C under condition F and the fatigue life of the condition corresponding to position D under condition F.

[0073] In this example, based on the vehicle durability test load spectrum corresponding to the original stress point, the original stress point is simulated and loaded under multiple test conditions, which can more accurately determine the fatigue life of each initial risk position under each test condition. This method can obtain a more accurate fatigue life of each initial risk position under each test condition without the need for a real vehicle durability test, which is convenient and fast, saving manpower and material resources.

[0074] As an example, in step S202, the computer device analyzes and processes the fatigue life of the same initial risk position under multiple test conditions to obtain a first fatigue life corresponding to the same initial risk position.

[0075] In this example, the computer device can directly accumulate the fatigue life of the same initial risk position under multiple test conditions to obtain an accumulated processing result, and determine the accumulated processing result as the first fatigue life corresponding to the same initial risk position. For example, the initial risk position includes the C position and the D position, and the test conditions include the E condition and the F condition. For the C position, the computer device accumulates or otherwise processes the fatigue life of the C position under the E condition and the fatigue life of the C position under the F condition to obtain the first fatigue life corresponding to the C position. For the D position, the computer device accumulates or otherwise processes the fatigue life of the D position under the E condition and the fatigue life of the D position under the F condition to obtain the first fatigue life corresponding to the D position.

[0076] In this example, the computer device can also use a preset weight to perform weighted processing on the fatigue life of the same initial risk position under multiple test conditions to obtain a weighted processing result, and determine the weighted processing result as the first fatigue life corresponding to the same initial risk position. For example, the initial risk position includes the C position and the D position, and the test conditions include the E condition and the F condition. For the C position, the computer device uses the preset weight α to correct the fatigue life of the C position under the E condition to obtain a first correction result, uses the preset weight β to correct the fatigue life of the C position under the F condition to obtain a second correction result, and sums the first correction result and the second correction result to obtain the first fatigue life corresponding to the C position. Similarly, for the D position, the computer device uses the preset weight γ to correct the fatigue life of the D position under the E condition to obtain a third correction result, uses the preset weight μ to correct the fatigue life of the D position under the F condition to obtain a fourth correction result, and sums the third correction result and the fourth correction result to obtain the first fatigue life corresponding to the D position.

[0077] In this embodiment, a relatively accurate fatigue life of each initial risk position under each test condition can be obtained without conducting a real vehicle durability test, which is relatively convenient and fast, saving manpower and material resources. By analyzing and processing the fatigue life of the same initial risk position under multiple test conditions, the first fatigue life corresponding to the same initial risk position can be determined more comprehensively and accurately.

[0078] In one embodiment, the rear subframe includes at least one original stress point and at least one initial risk position;

[0079] like Figure 3 As shown, step S103, i.e. testing the rear subframe based on the original equivalent load spectrum to determine the second fatigue life corresponding to the equivalent load condition, includes:

[0080] S301: Based on an original equivalent load spectrum corresponding to at least one original stress point, perform a single simulation loading test on at least one original stress point to determine at least one initial fatigue life corresponding to each initial risk position;

[0081] S302: Process at least one initial fatigue life corresponding to each initial risk position to determine a second fatigue life of each initial risk position.

[0082] Among them, the initial fatigue life refers to the fatigue life of the initial risk position when an original stress point is subjected to the original equivalent load spectrum corresponding to the original stress point alone. A single simulation loading test means that the original equivalent load spectrum is only applied to one original stress point in each simulation test. In this example, when the actual bench durability test is carried out on the rear subframe, the equivalent load spectrum can usually only be loaded on one original stress point in each test. Therefore, when the rear subframe is subjected to a simulation loading test using the original equivalent load spectrum, the original equivalent load spectrum corresponding to the original stress point is only applied to one original stress point each time.

[0083] As an example, in step S301, the computer device obtains the component model corresponding to the rear subframe through finite element modeling, uses the original equivalent load spectrum corresponding to an original stress point, and performs a separate simulation loading test on the corresponding original stress point in the component model to obtain the initial fatigue life corresponding to each initial risk position when the original stress point is subjected to the corresponding original equivalent load spectrum. By analogy, the initial fatigue life corresponding to each initial risk position when each original stress point is subjected to the corresponding original equivalent load spectrum is obtained. For example, the original stress points include point A and point B, and the initial risk positions include position C and position D. The computer device uses the original equivalent load spectrum corresponding to point A to perform a simulation loading test on the corresponding point A in the component model, and obtains the initial fatigue life corresponding to position C and the initial fatigue life corresponding to position D, respectively. The computer device uses the original equivalent load spectrum corresponding to point B to perform a simulation loading test on the corresponding point B in the component model, and obtains the initial fatigue life corresponding to position C and the initial fatigue life corresponding to position D, respectively.

[0084] As an example, in step S302, the computer device analyzes and processes at least one initial fatigue life corresponding to the same initial risk position to determine a second fatigue life of each initial risk position.

[0085] In this example, the computer device can directly perform accumulation processing on at least one initial fatigue life corresponding to the same initial risk position to obtain an accumulation processing result, and determine the accumulation processing result as the second fatigue life corresponding to the same initial risk position.

[0086] For example, the original stress points include point A and point B, and the initial risk positions include position C and position D. For position C, the computer device accumulates or otherwise processes the initial fatigue life corresponding to position C when point A is subjected to the corresponding original equivalent load spectrum alone, and the initial fatigue life corresponding to position C when point B is subjected to the corresponding original equivalent load spectrum alone, to obtain the second fatigue life corresponding to position C. For position D, the computer device accumulates or otherwise processes the initial fatigue life corresponding to position D when point A is subjected to the corresponding original equivalent load spectrum alone, and the initial fatigue life corresponding to position D when point B is subjected to the corresponding original equivalent load spectrum alone, to obtain the second fatigue life corresponding to position D.

[0087] In this example, the computer device can also use a preset weight to perform weighted processing on at least one initial fatigue life corresponding to the same initial risk position to obtain a weighted processing result, and determine the weighted processing result as the second fatigue life corresponding to the same initial risk position. For example, the original force points include point A and point B, and the initial risk positions include position C and position D. For position C, the computer device uses a preset weight ω to correct the initial fatigue life corresponding to position C when point A is subjected to the corresponding original equivalent load spectrum alone, and obtains a fifth correction result. When point B is subjected to the corresponding original equivalent load spectrum alone, the initial fatigue life corresponding to position C is corrected using a preset weight φ to obtain a sixth correction result. The fifth correction result and the sixth correction result are accumulated to obtain the second fatigue life corresponding to position C. For the D position, the computer device uses a preset weight ε to correct the initial fatigue life corresponding to the D position when point A is subjected to the corresponding original equivalent load spectrum alone, and obtains the seventh correction result. The computer device uses a preset weight τ to correct the initial fatigue life corresponding to the D position when point B is subjected to the corresponding original equivalent load spectrum alone, and obtains the eighth correction result. The seventh correction result and the eighth correction result are accumulated to obtain the second fatigue life corresponding to the D position.

[0088] In this embodiment, based on the original equivalent load spectrum corresponding to each original stress point, a simulation test is performed on each original stress point in the rear subframe, so that the second fatigue life of each initial risk position can be determined more accurately.

[0089] In one embodiment, the first fatigue life corresponding to the vehicle durability condition includes the first fatigue life corresponding to at least one initial risk position; the second fatigue life corresponding to the equivalent load condition includes the second fatigue life corresponding to at least one initial risk position and the initial fatigue life.

[0090] In one embodiment, if Figure 4As shown, step S104, i.e., adjusting the original equivalent load spectrum corresponding to the rear subframe based on the first fatigue life corresponding to the vehicle durability condition and the second fatigue life corresponding to the equivalent load condition, and determining the target equivalent load spectrum corresponding to the rear subframe, includes:

[0091] S401: If the first fatigue life and the second fatigue life corresponding to all initial risk positions satisfy the preset fatigue life condition, the original equivalent load spectrum corresponding to the rear subframe is determined as the target equivalent load spectrum corresponding to the rear subframe;

[0092] S402: If the first fatigue life and the second fatigue life corresponding to at least one initial risk position do not satisfy the preset fatigue life condition, the original equivalent load spectrum corresponding to the rear subframe is adjusted to determine a target equivalent load spectrum corresponding to the rear subframe.

[0093] The preset fatigue life condition refers to a preset condition for determining the difference between the first fatigue life and the second fatigue life.

[0094] As an example, in step S401, when the computer device determines that the first fatigue life and the second fatigue life corresponding to all initial risk positions meet the preset fatigue life condition, the original equivalent load spectrum corresponding to the rear subframe is determined as the target equivalent load spectrum corresponding to the rear subframe. In this example, the preset fatigue condition may be that the difference between the first fatigue life and the second fatigue life corresponding to the same initial risk position is within a preset range. For example, the preset range is 10%, that is, the difference between the first fatigue life and the second fatigue life corresponding to the same initial risk position is within 10%. Understandably, if the difference between the first fatigue life and the second fatigue life corresponding to the same initial risk position is small, it indicates that the correlation between the bench endurance test and the vehicle endurance test is high. At this time, the original equivalent load spectrum has a higher accuracy, and the original equivalent load spectrum with higher accuracy is determined as the target equivalent load spectrum.

[0095] As an example, in step S402, when the computer device determines that the first fatigue life and the second fatigue life corresponding to at least one initial risk position do not meet the preset fatigue life condition, the computer device adjusts the original equivalent load spectrum corresponding to the rear subframe to determine the target equivalent load spectrum corresponding to the rear subframe. Understandably, if the first fatigue life and the second fatigue life corresponding to at least one initial risk position do not meet the preset fatigue life condition, it indicates that the difference between the first fatigue life and the second fatigue life corresponding to at least one initial risk position is large, and the correlation between the bench endurance test and the vehicle endurance test is low. At this time, the accuracy of the original equivalent load spectrum is low, and the original equivalent load spectrum needs to be adjusted to obtain a target equivalent load spectrum with higher accuracy to improve the correlation between the bench endurance test and the vehicle endurance test.

[0096] In this embodiment, according to whether the first fatigue life and the second fatigue life corresponding to each initial risk position meet the preset fatigue life conditions, a high-precision target equivalent load spectrum corresponding to the rear subframe is determined to improve the correlation between the bench endurance test and the vehicle endurance test, thereby improving the development efficiency of the rear subframe.

[0097] In one embodiment, if Figure 5 As shown, step S402, i.e., adjusting the original equivalent load spectrum corresponding to the rear subframe to determine the target equivalent load spectrum corresponding to the rear subframe, includes:

[0098] S501: determining a key stress point corresponding to the rear subframe based on a first fatigue life and a second fatigue life corresponding to the same initial risk position;

[0099] S502: Adjust the original equivalent load spectrum corresponding to the key stress point to determine the target equivalent load spectrum corresponding to the key stress point.

[0100] Among them, the key stress point refers to the original stress point after screening.

[0101] As an example, in step S501, the computer device analyzes the first fatigue life and the second fatigue life corresponding to the same initial risk position, and respectively determines the original stress point that has a greater impact on the first fatigue life and the original stress point that has a greater impact on the second fatigue life, and jointly determines the key stress point corresponding to the rear subframe based on the original stress point that has a greater impact on the first fatigue life and the original stress point that has a greater impact on the second fatigue life. It can be understood that the key stress point has a greater impact on the fatigue life of the rear subframe, and determining the key stress point facilitates adjusting the original equivalent load spectrum corresponding to the key stress point to more efficiently obtain a target equivalent load spectrum with higher accuracy.

[0102] As an example, in step S502, the computer device adjusts the original equivalent load spectrum corresponding to each key stress point according to a preset adjustment rule to obtain an adjusted original equivalent load spectrum corresponding to each key stress point. Based on the adjusted original equivalent load spectrum corresponding to each key stress point and the unadjusted original equivalent load spectrum corresponding to the remaining original stress points, steps S301 and S302 are repeated to determine the second fatigue life corresponding to the adjusted original equivalent load spectrum, and steps S401 and S402 are executed to further determine whether the second fatigue life corresponding to the adjusted original equivalent load spectrum and the first fatigue life meet the preset fatigue life condition. If the preset fatigue life condition is met, the adjusted original equivalent load spectrum is determined as the target equivalent load spectrum corresponding to the key stress point. If the preset fatigue life condition is not met, the above steps are continued to be repeated until the second fatigue life corresponding to the adjusted original equivalent load spectrum and the first fatigue life meet the preset fatigue life condition, and the target equivalent load spectrum corresponding to the key stress point is obtained.

[0103] In this embodiment, the key stress points that have a greater impact on the second fatigue life are determined, the original equivalent load spectrum corresponding to each key stress point is adjusted, and the target equivalent load spectrum with higher accuracy corresponding to the key stress points is determined. Only the original equivalent load spectrum corresponding to the key stress points that have a greater impact on the second fatigue life is adjusted, so that a target equivalent load spectrum with higher accuracy can be obtained more efficiently.

[0104] In one embodiment, if Figure 6 As shown, step S501, i.e., determining the key stress points corresponding to the rear subframe based on the first fatigue life corresponding to the vehicle durability condition and the second fatigue life corresponding to the equivalent load condition, includes:

[0105] S601: determining a target risk position corresponding to the rear subframe based on a first fatigue life and a second fatigue life corresponding to each initial risk position;

[0106] S602: Determine a key stress point corresponding to the rear subframe according to at least one initial fatigue life corresponding to each target risk position.

[0107] Among them, the target risk position refers to the initial risk position with lower fatigue life.

[0108] As an example, in step S601, the computer device analyzes the first fatigue life and the second fatigue life corresponding to each initial risk position, screens the initial risk position corresponding to the rear subframe, and determines the target risk position corresponding to the rear subframe. In this example, the computer device sorts the first fatigue life and the second fatigue life in ascending order, determines the initial risk positions corresponding to the first N (where N≥2) first fatigue lives as the target risk positions, and determines the initial risk positions corresponding to the first M (where M≥2) second fatigue lives as the target risk positions. It can be understood that the first fatigue life and / or the second fatigue life corresponding to the target risk position are relatively low, and need to be observed in detail in order to optimize the design of the rear subframe. Therefore, selecting the initial risk position with a lower fatigue life as the target risk position can more accurately determine the key stress points, so as to achieve a more optimized design of the rear subframe during the automobile design stage.

[0109] The initial fatigue life refers to the fatigue life of an initial risk position when an original stress point is subjected to the original equivalent load spectrum corresponding to the original stress point. It can be understood that by screening each initial risk position, a target risk position is obtained. Therefore, the target risk position also corresponds to an initial fatigue life corresponding to at least one original stress point.

[0110] As an example, in step S602, the computer device obtains at least one initial fatigue life corresponding to each target risk position, sorts the initial fatigue life corresponding to each target risk position in descending order, and determines the original stress points corresponding to the first K (where K≥1) initial fatigue lives as key stress points. Understandably, the first K initial fatigue lives are relatively large, and have a greater impact on the first fatigue life or the second fatigue life of the target risk position. The original stress points corresponding to the first K initial fatigue lives are determined as key stress points, which facilitates the subsequent further adjustment of the original equivalent load spectrum corresponding to the key stress points, and more effectively determines the target equivalent load spectrum corresponding to the rear subframe, which is more efficient.

[0111] In this embodiment, the initial risk position with a lower fatigue life is taken as the target risk position, so as to more accurately determine the key stress point according to the target risk position, and the key stress point corresponding to the rear subframe is determined according to the initial fatigue life corresponding to each target risk position, so as to facilitate the subsequent further adjustment of the original equivalent load spectrum corresponding to the key stress point, without adjusting the original equivalent load spectrum corresponding to other original stress points, so that the target equivalent load spectrum corresponding to the rear subframe can be determined more efficiently and accurately.

[0112] In one embodiment, if Figure 7As shown, step S502, i.e., adjusting the original equivalent load spectrum corresponding to the key stress point to determine the target equivalent load spectrum corresponding to the key stress point, includes:

[0113] S701: Obtain a fatigue life curve corresponding to a key stress point, and determine a load scaling factor corresponding to the key stress point based on the fatigue life curve;

[0114] S702: Based on the load scaling coefficient, the original equivalent load spectrum corresponding to the key stress point is scaled to determine the target equivalent load spectrum corresponding to the key stress point.

[0115] The fatigue life curve is used to determine the load scaling factor corresponding to the original equivalent load spectrum. The load scaling factor refers to the factor used to scale the original equivalent load spectrum.

[0116] As an example, in step S701, the computer device obtains the fatigue life curve generated by the key stress point during the simulation loading test, as well as the material properties corresponding to the key stress point, analyzes and solves the material properties corresponding to the key stress point and the fatigue life curve corresponding to each key stress point, and determines the load scaling coefficient corresponding to each key stress point, so as to scale the original equivalent load spectrum corresponding to each key stress point according to the load scaling coefficient corresponding to each key stress point.

[0117] As an example, in step S702, the computer device uses the load scaling coefficient corresponding to each key stress point to scale the original equivalent load spectrum of each key stress point to obtain the target equivalent load spectrum corresponding to each key stress point. For example, if the original stress points corresponding to the target risk position are point A and point B, and the key stress point is point A, the load scaling coefficient corresponding to point A is used to scale the original equivalent load spectrum corresponding to point A to obtain the scaled original equivalent load spectrum corresponding to point A. Based on the scaled original equivalent load spectrum corresponding to point A and the original equivalent load spectrum corresponding to point B that has not been scaled, steps S301 to S302 are executed to obtain the second fatigue life corresponding to the target risk position, and steps S401 and S402 are continued to be executed to determine whether the second fatigue life corresponding to the target risk position and the first fatigue life corresponding to the target risk position meet the preset fatigue life condition. If the preset fatigue life condition is met, the scaled original equivalent load spectrum corresponding to point A is determined as the target equivalent load spectrum corresponding to point A. If the preset fatigue life condition is not met, the above steps are continued to be executed until the second fatigue life corresponding to the target risk position and the first fatigue life corresponding to the target risk position meet the preset fatigue life condition to obtain the target equivalent load spectrum corresponding to point A.

[0118] In this embodiment, the load scaling coefficient corresponding to each key stress point is used to scale the original equivalent load spectrum of each key stress point, so that a high-precision target equivalent load spectrum corresponding to each key stress point can be obtained more accurately.

[0119] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0120] In one embodiment, a load equivalent device is provided, which corresponds one-to-one to the load equivalent method in the above embodiment. Figure 8 As shown, the load equivalent device includes a load spectrum acquisition module 801, a first fatigue life determination module 802, a second fatigue life determination module 803 and an equivalent load spectrum adjustment module 804. The functional modules are described in detail as follows:

[0121] The load spectrum acquisition module 801 is used to acquire the vehicle durability test load spectrum and the original equivalent load spectrum corresponding to the rear subframe;

[0122] A first fatigue life determination module 802 tests the rear subframe based on a vehicle durability test load spectrum to determine a first fatigue life corresponding to a vehicle durability condition;

[0123] A second fatigue life determination module 803 tests the rear subframe based on the original equivalent load spectrum to determine a second fatigue life corresponding to the equivalent load condition;

[0124] The equivalent load spectrum adjustment module 804 adjusts the original equivalent load spectrum corresponding to the rear subframe based on the first fatigue life corresponding to the vehicle durability condition and the second fatigue life corresponding to the equivalent load condition, and determines a target equivalent load spectrum corresponding to the rear subframe.

[0125] In one embodiment, the first fatigue life determination module 802 includes:

[0126] The working condition fatigue life determination submodule performs a simulation loading test on at least one original stress point under multiple test conditions based on the vehicle durability test load spectrum corresponding to at least one original stress point, and determines the working condition fatigue life of each initial risk position under each test condition;

[0127] The first fatigue life determination submodule is used to process the working condition fatigue life of the same initial risk position under multiple test conditions to determine the first fatigue life corresponding to the same initial risk position.

[0128] In one embodiment, the second fatigue life determination module 803 includes:

[0129] The initial fatigue life determination submodule performs a single simulation loading test on at least one original stress point based on an original equivalent load spectrum corresponding to at least one original stress point to determine at least one initial fatigue life corresponding to each initial risk position;

[0130] The second fatigue life determination submodule is used to process at least one initial fatigue life corresponding to each initial risk position to determine a second fatigue life of each initial risk position.

[0131] In one embodiment, the equivalent load spectrum adjustment module 804 includes:

[0132] A first equivalent load spectrum adjustment submodule is used to determine the original equivalent load spectrum corresponding to the rear subframe as the target equivalent load spectrum corresponding to the rear subframe if the first fatigue life and the second fatigue life corresponding to all initial risk positions meet the preset fatigue life condition;

[0133] The second equivalent load spectrum adjustment submodule is used to adjust the original equivalent load spectrum corresponding to the rear subframe if the first fatigue life and the second fatigue life corresponding to at least one initial risk position do not meet the preset fatigue life condition, so as to determine the target equivalent load spectrum corresponding to the rear subframe.

[0134] In one embodiment, the second equivalent load spectrum adjustment submodule includes:

[0135] A key stress point determination unit, which determines a key stress point corresponding to the rear subframe based on a first fatigue life and a second fatigue life corresponding to the same initial risk position;

[0136] The target equivalent load spectrum determination unit is used to adjust the original equivalent load spectrum corresponding to the key stress point and determine the target equivalent load spectrum corresponding to the key stress point.

[0137] In one embodiment, the key force point determination unit includes:

[0138] A target risk position determination subunit determines a target risk position corresponding to the rear subframe based on a first fatigue life and a second fatigue life corresponding to each initial risk position;

[0139] The key stress point determination subunit is used to determine the key stress point corresponding to the rear subframe according to at least one initial fatigue life corresponding to each target risk position.

[0140] In one embodiment, the target equivalent load spectrum determining unit includes:

[0141] A load scaling factor determination subunit is used to obtain a fatigue life curve corresponding to a key stress point, and determine a load scaling factor corresponding to the key stress point based on the fatigue life curve;

[0142] The target equivalent load spectrum determination subunit performs scaling processing on the original equivalent load spectrum corresponding to the key stress point based on the load scaling coefficient, and determines the target equivalent load spectrum corresponding to the key stress point.

[0143] For the specific definition of the load equivalent device, please refer to the definition of the load equivalent method above, which will not be repeated here. Each module in the above load equivalent device can be implemented in whole or in part by software, hardware and a combination thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0144] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Fig. 9 As shown. The computer device includes a processor, a memory, a network interface and a database connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data used or generated during the execution of the load equivalence method. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a load equivalence method is implemented.

[0145] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the load equivalence method in the above embodiment is implemented, for example Figure 1 S101-S104 as shown, or Figures 2 to 7 As shown in , to avoid repetition, it will not be described here. Alternatively, when the processor executes the computer program, the functions of each module / unit in the load equivalent device embodiment are realized, such as Figure 8 The functions of the load spectrum acquisition module 801 , the first fatigue life determination module 802 , the second fatigue life determination module 803 and the equivalent load spectrum adjustment module 804 are not described here in detail to avoid repetition.

[0146] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the load equivalence method in the above embodiment is implemented, for example Figure 1 S101-S104 as shown, or Figures 2 to 7Alternatively, when the computer program is executed by a processor, the functions of each module / unit in the load equivalent device embodiment are realized, for example Figure 8 The functions of the load spectrum acquisition module 801, the first fatigue life determination module 802, the second fatigue life determination module 803 and the equivalent load spectrum adjustment module 804 are not described here to avoid repetition. The computer-readable storage medium may be non-volatile or volatile.

[0147] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0148] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0149] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A load equivalence method, characterized in that: include: Obtain the vehicle durability test load spectrum and original equivalent load spectrum corresponding to the rear subframe; Testing the rear subframe based on the vehicle durability test load spectrum to determine a first fatigue life corresponding to the vehicle durability working condition; Testing the rear subframe based on the original equivalent load spectrum to determine a second fatigue life corresponding to the equivalent load condition; Based on the first fatigue life corresponding to the whole vehicle durability condition and the second fatigue life corresponding to the equivalent load condition, the original equivalent load spectrum corresponding to the rear subframe is adjusted to determine the target equivalent load spectrum corresponding to the rear subframe.

2. The load equivalence method according to claim 1, characterized in that: The rear subframe includes at least one original stress point and at least one initial risk position; the vehicle durability working condition includes multiple test working conditions; The testing of the rear subframe based on the vehicle durability test load spectrum to determine a first fatigue life corresponding to the vehicle durability condition includes: Based on the vehicle durability test load spectrum corresponding to at least one of the original stress points, a simulation loading test is performed on at least one of the original stress points under multiple test conditions to determine the fatigue life of each of the initial risk positions under each of the test conditions; The operating fatigue life of the same initial risk position under the multiple test conditions is processed to determine the first fatigue life corresponding to the same initial risk position.

3. The load equivalence method according to claim 1, characterized in that: The rear subframe includes at least one original stress point and at least one initial risk position; The testing of the rear subframe based on the original equivalent load spectrum to determine the second fatigue life corresponding to the equivalent load condition includes: Based on the original equivalent load spectrum corresponding to at least one of the original stress points, a single simulation loading test is performed on at least one of the original stress points to determine at least one initial fatigue life corresponding to each of the initial risk positions; At least one initial fatigue life corresponding to the same initial risk position is processed to determine a second fatigue life of each initial risk position.

4. The load equivalence method according to claim 1, characterized in that: The first fatigue life corresponding to the vehicle durability condition includes a first fatigue life corresponding to at least one initial risk position; The second fatigue life corresponding to the equivalent load condition includes the second fatigue life and the initial fatigue life corresponding to at least one initial risk position; The adjusting the original equivalent load spectrum corresponding to the rear subframe based on the first fatigue life corresponding to the vehicle durability working condition and the second fatigue life corresponding to the equivalent load working condition to determine the target equivalent load spectrum corresponding to the rear subframe includes: If the first fatigue life and the second fatigue life corresponding to all initial risk positions satisfy the preset fatigue life condition, the original equivalent load spectrum corresponding to the rear subframe is determined as the target equivalent load spectrum corresponding to the rear subframe; If the first fatigue life and the second fatigue life corresponding to at least one initial risk position do not meet the preset fatigue life condition, the original equivalent load spectrum corresponding to the rear subframe is adjusted to determine the target equivalent load spectrum corresponding to the rear subframe.

5. The load equivalence method according to claim 4, characterized in that: The adjusting the original equivalent load spectrum corresponding to the rear subframe to determine the target equivalent load spectrum corresponding to the rear subframe includes: Determining a key stress point corresponding to the rear subframe based on a first fatigue life and a second fatigue life corresponding to the same initial risk position; The original equivalent load spectrum corresponding to the key stress point is adjusted to determine the target equivalent load spectrum corresponding to the key stress point.

6. The load equivalent method according to claim 5, characterized in that: The determining of the key stress point corresponding to the rear subframe based on the first fatigue life and the second fatigue life corresponding to the same initial risk position includes: Determine a target risk position corresponding to the rear subframe based on a first fatigue life and a second fatigue life corresponding to each of the initial risk positions; According to at least one initial fatigue life corresponding to each target risk position, a key stress point corresponding to the rear subframe is determined.

7. The load equivalence method according to claim 5, characterized in that: The adjusting the original equivalent load spectrum corresponding to the key stress point to determine the target equivalent load spectrum corresponding to the key stress point includes: Obtaining a fatigue life curve corresponding to the key stress point, and determining a load scaling factor corresponding to the key stress point based on the fatigue life curve; Based on the load scaling coefficient, the original equivalent load spectrum corresponding to the key stress point is scaled to determine the target equivalent load spectrum corresponding to the key stress point.

8. A load equivalent device, characterized in that: include: A load spectrum acquisition module is used to obtain the vehicle durability test load spectrum and the original equivalent load spectrum corresponding to the rear subframe; A first fatigue life determination module tests the rear subframe based on the vehicle durability test load spectrum to determine a first fatigue life corresponding to a vehicle durability condition; a second fatigue life determination module, testing the rear subframe based on the original equivalent load spectrum to determine a second fatigue life corresponding to the equivalent load condition; The equivalent load spectrum adjustment module adjusts the original equivalent load spectrum corresponding to the rear subframe based on the first fatigue life corresponding to the vehicle endurance condition and the second fatigue life corresponding to the equivalent load condition, and determines a target equivalent load spectrum corresponding to the rear subframe.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the load equivalence method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the load equivalence method according to any one of claims 1 to 7 is implemented.

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