High-temperature static test design method and system for rear bearing casing

Abstract

The invention belongs to the field of aero-engines, relates to a static test design technology of a rear force-bearing casing, and provides a high-temperature static test design method and system for the rear force-bearing casing, and the method comprises the steps: determining a load analysis working condition and an examination part of the rear force-bearing casing within an envelope range of an engine; the load analysis working condition comprises a limit load analysis working condition and a limited load analysis working condition; determining an external load under the load analysis working condition; constructing a static test piece of the rear bearing casing; force loads in the external load and the basic load are equivalent, and a limit load analysis working condition temperature field and a limited load analysis working condition temperature field are constructed respectively; and distributing an equivalent load, firstly carrying out a load limiting test, and then carrying out a limit load test. The method provided by the invention can meet the assessment requirements of the static test of the rear bearing case, and more comprehensively guarantee the safety and reliability of the rear bearing case in a high-temperature environment.

Description

Technical Field

[0001] The present invention belongs to the field of aeroengines, relates to the static test design technology of a rear bearing case, and particularly relates to a high-temperature static test design method and system for a rear bearing case. Background Art

[0002] The rear bearing case is an important load-bearing frame case of an aeroengine. It mainly bears the thrust and vibration loads of the engine, and has a direct impact on the performance, life, and reliability of the engine. According to the requirements of the GJB241A-2010 standard in the General Requirements for the Reliability of Electronic Equipment, in order to support the working reliability of the rear bearing case, a static test needs to be carried out.

[0003]

[0004] In view of this, it is imperative to carry out a static test on the rear bearing case under high-temperature working conditions. Summary of the Invention

[0005] To solve the technical problem that the rear bearing case cannot reach the test of dangerous parts through the room-temperature static test under a large temperature gradient, the present invention discloses a high-temperature static test design method for a rear bearing case. The method includes the following steps: S1. According to the ultimate tensile strength and yield strength limit, obtain the load analysis working conditions and test parts of the rear bearing case within the engine envelope. The load analysis working conditions include the ultimate load analysis working condition and the limit load analysis working condition; S2. Determine the external loads under the load analysis working conditions through the stress component matrix algorithm; S3. Install a plurality of first actuators on the auxiliary mounting joints of the rear bearing case, install a plurality of second actuators on the fulcrum adapter case, and set a temperature field control device at the position of the bearing strut close to the rear bearing case to construct a static test piece of the rear bearing case; S4. Equivalently process the force loads in the external loads and the basic loads respectively according to the force load equivalence logic, and construct a temperature field for the ultimate load analysis working condition and a temperature field for the limit load analysis working condition respectively; ​S5. Assign the equivalent load to the first actuator and the second actuator. First, conduct a limit load test by analyzing the temperature field under the limit load analysis condition and the equivalent load under the limit load analysis condition. Then, conduct an ultimate load test by analyzing the temperature field under the ultimate load analysis condition and the equivalent load under the ultimate load analysis condition.

[0006] Further, in the above step S1, based on the tensile strength limit and the yield strength limit, obtain the load analysis conditions and the assessment parts of the rear bearing case within the engine envelope, including: S11. Obtain the stress field of each working state within the engine envelope through a simulation method, and obtain the equivalent stress at each position on the rear bearing case according to the stress field. S12. Calculate the yield strength reserve at each position in each working state according to the equivalent stress and the yield strength limit, and take the working state with the minimum yield strength reserve among all the working states as the limit load analysis condition. S13. Calculate the ultimate strength reserve at each position in each working state according to the equivalent stress and the tensile strength limit, and take the working state with the minimum ultimate strength reserve among all the working states as the ultimate load analysis condition. S14. Extract all the positions where the yield strength reserve is within the yield strength threshold range under the limit load analysis condition, and extract all the positions where the ultimate strength reserve is within the ultimate strength threshold range under the limit load analysis condition. Take all the extracted positions as the assessment parts.

[0007] Further, in the above step S2, determine the external load under the load analysis condition through the stress component matrix algorithm, including: S21. Obtain multiple groups of maneuver overload combination coefficients representing the external load during maneuver flight. S22. For each group of the maneuver overload combination coefficients, calculate the product of the second stress result under each unit maneuver overload and its corresponding maneuver overload coefficient, and sum all the products to obtain the external load stress. S23. Calculate the material strength reserve under each group of the maneuver overload combination coefficients according to the material strength limit and the external load equivalent stress of the external load, and take the maneuver overload combination coefficient with the minimum material strength reserve as the external load, where the material strength limit includes the tensile strength limit and the yield strength limit, and the material strength reserve includes the yield strength reserve and the ultimate strength reserve.

[0008] Further, in the above step S4, respectively perform force load equivalence on the external load and the force load in the basic load according to the force load equivalence logic, including: S41. Obtain the force load in the basic loads that cannot be directly loaded during the high-temperature static test. S42. Calculate the equivalent stress at the assessment part generated by the external load and each of the force loads at the assessment part respectively. Obtain the external equivalent force load according to the force load equivalence logic within the set deviation range of the deviation from each equivalent stress at the assessment part.

[0009] Furthermore, step S4 above further includes: S43. Correct each of the external equivalent force loads respectively through the temperature coefficient to obtain the final external equivalent force load.

[0010] Furthermore, step S4 above further includes: S40. Conduct a sensitivity analysis on each of the force loads to obtain an influence factor, and obtain the final force load after removing the force loads with an influence factor less than the threshold. Among them, the final force load includes the pressure load and the torque.

[0011] Furthermore, in step S40 above, conducting a sensitivity analysis on each of the force loads to obtain an influence factor includes: S401. For the load analysis condition, unidirectionally load the temperature load and each force load in the basic loads to the rear bearing casing, and obtain the first stress result and the stress result at the assessment part under the temperature load and each of the force loads through the simulation method. S402. Calculate the product of the first stress result under the temperature load and each of the force loads and its corresponding safety factor respectively, sum all the products and conduct stress equivalence to obtain the equivalent stress of the basic loads, and calculate the sum of the equivalent stress of the basic loads and the equivalent stress of the external load. S403. Calculate the ratio of the stress result at the assessment part under each of the force loads to the sum to obtain the influence factor of the force load.

[0012] Further, in step S4 above, construct the temperature field of the limit load analysis condition and the temperature field of the limit load analysis condition respectively, including: S44. For the limit load analysis condition, generate a temperature field identical to the engine state through the temperature field control device as the temperature field of the limit load analysis condition. S45. For the limit load analysis condition, calculate the temperature gradient under the limit load analysis condition respectively through the casing static test and the material tensile strength, linear expansion coefficient, elastic modulus and casing temperature gradient of the casing during engine service. Construct the temperature field of the limit load analysis condition through the temperature field control device and the temperature gradient.

[0013] An embodiment of the present invention also provides a system for designing a high-temperature static test of a rear bearing housing, including a load analysis condition and assessment location determination module, an external load acquisition module, a rear bearing housing static test piece, an equivalent module, and a temperature field construction module.

[0014] Among them, the load analysis condition and assessment location determination module is used to obtain the load analysis conditions and assessment locations of the rear bearing housing within the engine envelope according to the ultimate tensile strength and yield strength limits. The load analysis conditions include an ultimate load analysis condition and a limit load analysis condition. The external load acquisition module is used to determine the external load under the load analysis conditions through a stress component matrix algorithm. The rear bearing housing static test piece includes a plurality of first actuators arranged on the auxiliary mounting joints of the rear bearing housing, a plurality of second actuators arranged on the fulcrum adapter housing, and a temperature field control device arranged at the position of the load-bearing strut close to the rear bearing housing. The equivalent module is used to equivalently process the force loads in the external loads and basic loads respectively according to the force load equivalence logic. The temperature field construction module is used to construct a temperature field for the ultimate load analysis condition and a temperature field for the limit load analysis condition respectively.

[0015] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the embodiments of the present specification at least include: The method of the present invention can solve the problem that the true service conditions of the rear bearing housing with a large temperature gradient cannot be characterized in the room temperature static test, ensure that the failure positions and failure modes of the rear bearing housing static test piece and the engine rear bearing housing are the same, and meet the requirements of engineering safety and reliability. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a flow chart of the method for designing the high-temperature static test of the rear bearing housing; Figure 2 It is a schematic diagram of the rear bearing housing static test piece; Figure 3 It is a schematic diagram of the actuator on the rear bearing housing static test piece; Figure 4 It is a schematic diagram of the temperature field control device on the rear bearing housing static test piece. Detailed Description of the Embodiment

[0018] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0019] The following uses specific specific examples to illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features of the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0020] The embodiment of the present invention discloses a design method for the high-temperature static test of a rear bearing housing. Refer to Figure 1 as shown, the method includes the following steps: S1. According to the ultimate tensile strength and yield strength limit, obtain the load analysis working conditions and assessment parts of the rear bearing housing within the engine envelope. The load analysis working conditions include the ultimate load analysis working condition and the limit load analysis working condition; S2. Determine the external loads under the load analysis working conditions through the stress component matrix algorithm; S3. Install a plurality of first actuators on the auxiliary mounting joints of the rear bearing housing, install a plurality of second actuators on the fulcrum adapter housing, and set a temperature field control device at the position of the bearing strut close to the rear bearing housing to construct a static test piece of the rear bearing housing; S4. According to the force load equivalence logic, respectively equivalent the force loads in the external loads and the basic loads, and respectively construct the temperature field of the ultimate load analysis working condition and the temperature field of the limit load analysis working condition; S5. Assign the equivalent loads to the first actuator and the second actuator, first conduct a limit load test through the temperature field of the limit load analysis working condition and the equivalent load of the limit load analysis working condition, and then conduct an ultimate load test through the temperature field of the ultimate load analysis working condition and the equivalent load of the ultimate load analysis working condition.

[0021] Further, in the above step S1, according to the ultimate tensile strength and yield strength limit, obtaining the load analysis working conditions and assessment parts of the rear bearing housing within the engine envelope includes: S11. Obtain the stress field of each working state within the engine envelope through simulation, and obtain the equivalent stress at each position on the rear bearing housing according to the stress field. The working states within the engine envelope usually include the idle state, low load state, high load state, maximum power state, maximum torque state, engine protection state, and extreme working state, etc.

[0022] S12. Calculate the yield strength reserve at each position in each working state according to the equivalent stress and the yield strength limit, and take the working state with the minimum yield strength reserve among all the working states as the limiting load analysis condition.

[0023] S13. Calculate the ultimate strength reserve at each position in each working state according to the equivalent stress and the tensile strength limit, and take the working state with the minimum ultimate strength reserve among all the working states as the ultimate load analysis condition.

[0024] The yield strength reserve and the ultimate strength reserve at each position in each working state can be calculated by the following formulas (1) and (2): ...... Formula (1); ...... Formula (2); Where, is the yield strength limit of the material, is the equivalent stress, is the yield strength reserve; is the tensile strength limit of the material, is the ultimate strength reserve.

[0025] When determining the analysis condition, take the working state with the minimum yield strength reserve / ultimate strength reserve as the limiting load analysis condition / ultimate load analysis condition.

[0026] S14. Extract all the positions where the yield strength reserve is within the yield strength threshold range under the limiting load analysis condition, extract all the positions where the ultimate strength reserve is within the ultimate strength threshold range under the limiting load analysis condition, and take all the extracted positions as the assessment parts.

[0027] In specific implementation, the yield strength threshold range / ultimate strength threshold range can be set to 1 - 2 times the yield strength reserve / ultimate strength reserve according to user requirements. As long as the positions within this range are the assessment parts for the high-temperature static stress test. For example, the connection positions of the struts on the rear bearing housing with the inner and outer casings, the edges of the mounting holes, the vent holes, etc. are all assessment areas.

[0028] Further, in the above-mentioned step S2, since the limit load and the ultimate load need to consider external loads, and different external loads can be combined into up to hundreds of overload combinations (characterized by the maneuver overload combination coefficient), in the present invention, the high-temperature static stress test only needs to be carried out under the most dangerous external load combination. Therefore, the external load under the load analysis condition is determined by the stress component matrix algorithm, including: S21. Obtain multiple groups of maneuver overload combination coefficients characterizing the external loads borne during maneuvering flight. The maneuver overload combination coefficient can be obtained from the aircraft flight requirements and can be expressed by the following formula (3): .......Formula (3), where ~ are 7 different types of maneuver overload coefficients in each group of maneuver overload combination coefficients, which can be extracted from the design requirements of maneuvering flight.

[0029] S22. For each group of the maneuver overload combination coefficients, calculate the product of the second stress result under each unit maneuver overload and its corresponding maneuver overload coefficient, and sum all the products to obtain the external load stress.

[0030] A certain external load stress component in the external load stress can be expressed by the following formula (4): .......Formula (4), where represents the sum of a certain group of maneuver overload combination coefficients in the j-th stress component at the i-th node of the rear bearing housing, that is, the external load stress component; is the a-th unit maneuver overload coefficient in the maneuver overload combination coefficient; represents the j-th stress component at the i-th node of the rear bearing housing under the a-th unit maneuver overload in a certain group of maneuver overload combination coefficients.

[0031] Generally speaking, each node has 6 stress components, corresponding to 6 external load stress components. When used in the following step S23, it is necessary to equivalent the 6 external load stress components of each node to obtain the external load stress of the node.

[0032] S23. According to the material strength limit and the external load equivalent stress of the external load stress, calculate the material strength reserve under each group of the maneuver overload combination coefficients, and take the maneuver overload combination coefficient with the smallest material strength reserve as the external load, where the material strength limit includes the tensile strength limit and the yield strength limit, and the material strength reserve includes the yield strength reserve and the ultimate strength reserve.

[0033] When determining the external load, compare the strength reserves of the assessment parts of the casing under different sets of maneuver overload combination coefficients, and select the set of maneuver overload combination coefficients with the smallest reserve as the external load for the static test of the casing.

[0034] Further, in the above step S3, as Figure 2 and Figure 3 shown, design the static test piece of the rear bearing casing, including the test piece (rear bearing casing) and the adapter casing. The test piece mainly includes the rear bearing outer casing 1, the load-bearing strut 2, and the rear bearing inner casing 3; the adapter casing mainly includes the outer casing adapter casing 5 and the fulcrum adapter casing 6. The front end 13 of the outer casing adapter casing is fixed to the tester; load is applied by actuators (the first actuator 9, the second actuator 10, the third actuator 11, and the fourth actuator 12) installed at the auxiliary mounting section 4; load is applied at the central hole 14 of the fulcrum adapter casing 6 (the fifth actuator 7 and the sixth actuator 8).

[0035] See Figure 4 shown, the temperature field control device mainly consists of a quartz lamp array 21 (one quartz lamp for each load-bearing strut), a heat preservation cover 22, cooling gas 24, a cooling ring cavity casing 23, thermocouples, etc. In order to achieve a gradient temperature field, the load-bearing struts are heated by the thermal radiation of the quartz lamp array 21 in the cavity formed by the heat preservation cover 22 until the average temperature of the radial section where the highest temperature of the support plate is located reaches the target temperature. A cooling ring cavity casing 23 is added outside the outer casing, and cooling gas 24 is introduced into the cavity where the inner and outer casings are located until the lowest temperature of the inner and outer casings reaches the target temperature. The temperature of the assessment area is achieved through heat conduction, and a large temperature gradient can be formed. Thermocouples are arranged at the radial section where the highest temperature of the support plate is located, the lowest temperature areas of the adjacent inner and outer casings of the support plate, and the assessment parts to monitor the temperature. Adjust the power and size of the quartz lamp, the distance between the quartz lamp and the test piece support plate, the temperature and flow rate of the cooling gas to control the temperature at different positions of the test piece, and achieve a large gradient temperature field of the rear bearing casing to ensure that the temperature of the test piece is consistent with the designed temperature field distribution.

[0036] Further, in the above step S4, the force loads in the external load and the basic load are respectively equivalent according to the force load equivalence logic, including: S40. Conduct a sensitivity analysis on each of the force loads to obtain influence factors, and obtain the final force loads after removing the force loads with influence factors less than the threshold. Among them, the final force loads include pressure loads and torques.

[0037] S41. Obtain the force loads in the basic load that cannot be directly loaded during the high-temperature static test; S42. Calculate the equivalent stress at the assessment location generated by the external load and each of the force loads respectively, and obtain the externally equivalent force load according to the force load equivalence logic in which the deviation from the equivalent stress at each assessment location is within the set deviation range.

[0038] Furthermore, step S4 above further includes: S43. Correct each of the externally equivalent force loads respectively through the temperature coefficient to obtain the final externally equivalent force load.

[0039] During implementation, since the temperature field applied during the static test of the casing cannot be completely consistent with the temperature field it experiences during service in the engine, it is necessary to perform temperature correction on the externally equivalent force loads determined in S42. During the actual test, the applied load needs to be multiplied by the corresponding temperature coefficient (including the temperature coefficient for the limit load, the temperature coefficient for the ultimate load) for adjustment. The calculation method of the temperature coefficient is shown in Formulas (13) and (14): ........ (Formula 13); .......... (Formula 14); In the formula, and are respectively the material strength of the assessment location temperature under the limit load and the ultimate load in the casing static test (the material strength under the limit load takes the yield strength, and the tensile strength is taken under the ultimate load); and are respectively the material strength of the assessment location temperature under the limit load and the ultimate load during the service of the casing in the engine.

[0040] Through the correction, the strength check is completed to ensure that the reserves at the assessment location are basically the same in the casing static test state and the engine service state, the reserve coefficient in the test state is not lower than that in the engine state, and at the same time ensure that the companion test piece will not be damaged prior to the test piece.

[0041] Furthermore, in step S40 above, a sensitivity analysis is performed on each of the force loads to obtain the influence factor, including: S401. For the load analysis condition, unidirectionally load the temperature load and each force load in the basic load on the rear bearing casing, and obtain the first stress result and the stress result at the assessment location under the temperature load and each of the force loads through the simulation method.

[0042] During implementation, the load types and their corresponding safety factors are shown in Table 1 below: Table 1: Load Types and Their Corresponding Safety Factors

[0043] S402. Calculate the product of the first stress result under the temperature load and each of the force loads and its corresponding safety factor, sum all the products and perform stress equivalence to obtain the equivalent stress of the basic load, and calculate the sum of the equivalent stress of the basic load and the equivalent stress of the external load.

[0044] In specific implementation, the j-th stress component of the i-th node in the equivalent stress of the basic load can be expressed by the following formula (5): ................... Formula (5), where is the j-th stress component of the i-th node in the equivalent stress of the basic load, is the stress result of the j-th stress component of the i-th node of the rear bearing housing, is the safety factor. Usually, each node has 6 stress components. Therefore, the equivalent stress of the basic load is obtained by equivalent of 6 stress components.

[0045] The sum of the equivalent stress of the basic load and the equivalent stress of the external load can be expressed by the following formula (6): ..................................... Formula (6).

[0046] S403. Calculate the ratio of the stress result of the assessment part under each of the force loads to the sum, and obtain the influence factor of the force load.

[0047] In implementation, the equivalent stress of the i-th node in the stress result of the assessment part under a certain force load can be expressed as , and the influence factor is calculated using the following formula (7) by dividing the yield strength reserve / ultimate strength reserve calculated in step S23 : ..................... (Formula 7); is the influence factor of a certain force load. If is less than the threshold value (such as 5%), then the force load is an insensitive load; if is greater than 5%, then the force load is a sensitive load.

[0048] Furthermore, in the above step S42, the equivalent methods for the pressure load, torque, and external load are as follows: Equivalent Pressure Load: Due to the complex structure and load of the rear bearing casing, applying the pressure load on the rear bearing casing is extremely complex and cannot be directly applied. It needs to be converted and applied through the actuator. Specifically, the axial forces generated by the pressure loads in each cavity are simplified to the axial load at the center hole position of the fulcrum adapter casing 6 through the load equivalent method. The requirements for load equivalence are as follows: The axial load after equivalent replacement is used to carry out the single-load analysis, and the equivalent stress value at the assessment location , is compared with the equivalent stress at the assessment location under the pressure load in the sensitive load analysis . If the deviation is within 1%, the scheme of equivalent pressure load to axial load is reasonable. Otherwise, adjust the axial load value until the requirements are met. Among them, the deviation can be calculated by the following formula (8): (Formula 8).

[0049] Equivalent Torque: The torque comes from the auxiliary mounting lug or the rear section casing, and the torque is converted into force loads with opposite directions and applied. The requirements for load equivalence are as follows: The deviation between the equivalent force load and the equivalent stress generated by the original torque load at the assessment location of the casing is within 1%.

[0050] Equivalent External Load: The external load is mainly transmitted through the fulcrum adapter casing 6 and the auxiliary mounting lug 4. There are multiple loading points around the auxiliary mounting lug. To avoid generating additional bending moments, the load is usually evenly distributed to the symmetric loading points, and the specific quantity is jointly determined by the number of actuators and the strength of the loading points. The requirements for load equivalence are as follows: The deviation between the equivalent force load and the equivalent stress generated by the original external load at the assessment location of the casing is within 1%.

[0051] Furthermore, in step S4 above, the temperature fields of the limit load analysis condition and the limit load analysis condition are respectively constructed, including: S44. For the limit load analysis condition, the temperature field control device generates a temperature field identical to the engine state as the temperature field of the limit load analysis condition.

[0052] During implementation, the temperature field of the limit load test should be exactly the same as the engine state. When it cannot be achieved due to the limitation of the maximum heating temperature of the test equipment and the temperature field control ability, equivalent treatment can be carried out by constructing a reserve temperature field with the same temperature. The equivalent temperature field should ensure that the average temperature of the radial section where the highest temperature of the strut is located is the same, the lowest temperatures of the inner and outer casings are the same, the temperatures of the assessment area are the same, and the heat load reserves caused by the temperature field are the same.

[0053] S45. For the limit load analysis condition, calculate the temperature gradient under the limit load analysis condition respectively through the casing static test and the material tensile strength, linear expansion coefficient, elastic modulus and casing temperature gradient of the casing during the engine service. Construct the temperature field under the limit load analysis condition through the temperature field control device and the temperature gradient.

[0054] During implementation, the limit load needs to consider a 1.5-fold thermal load. It is necessary to design the temperature field under the limit load, especially the temperature gradient that causes the thermal load to ensure that it is equal to the 1.5-fold thermal load reserve The specific conversion formula is as follows: ............ (Equation 9); ............ (Equation 10); ............ (Equation 11); ..... (Equation 12); In the formula: , , , are respectively the material tensile strength, linear expansion coefficient, elastic modulus, and casing temperature gradient of the equivalent temperature field of the limit load of the casing static test; , , , are respectively the material tensile strength, linear expansion coefficient, elastic modulus, and casing temperature gradient of the limit load temperature field of the casing during the engine service. It can be seen from the above formulas (9) to (12) that according to the maximum heating capacity of the equipment, the maximum temperature under the limit load is determined, and combined with the calculated temperature gradient the limit load temperature field can be constructed.

[0055] Furthermore, in the above step S5, First, distribute each of the external equivalent force loads evenly to the first actuator cylinder and / or the second actuator cylinder respectively according to the external load and the position of each force load on the rear bearing casing; Second, load application: After the test piece is preheated to the test temperature, start loading. The test load is applied in stages, and the increment of each stage does not exceed 20% of the maximum test load. Before reaching the maximum load, the load increment can be reduced to 10% - 5%. Monitor the temperature of the test piece, and the temperature fluctuation within the whole test process is within ±15°C; various loads are required to be applied jointly and slowly, and synchronously coordinated. The steady-state loading accuracy of the maximum load of each group of tests is 0 - +2%.

[0056] Finally, load holding and unloading: The load holding time after reaching the maximum load during the test is generally required to reach 5 minutes, and the load holding time for other loading and unloading levels is not less than 1 minute.

[0057] The method of the present invention can solve the problem that the true service conditions cannot be characterized in the room temperature static test of the rear bearing case after a large temperature gradient, ensure that the failure positions and failure modes of the static test piece of the rear bearing case are the same as those of the engine rear bearing case, and meet the requirements of engineering safety and reliability.

[0058] Based on the same inventive concept, an embodiment of the present invention also provides a high-temperature static test design system for a rear bearing case, as described in the following embodiments. Since the principle of solving problems by the high-temperature static test design system for a rear bearing case is similar to that of the high-temperature static test design method for a rear bearing case, the implementation of the high-temperature static test design system for a rear bearing case can refer to the implementation of the high-temperature static test design method for a rear bearing case disclosed in the above embodiments, and the repeated parts will not be described again. As used hereinafter, the term "unit" or "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0059] The high-temperature static test design system for a rear bearing case disclosed in the embodiment of the present invention includes a load analysis condition and assessment location determination module, an external load acquisition module, a rear bearing case static test piece, an equivalent module, and a temperature field construction module.

[0060] Among them, the load analysis condition and assessment location determination module is used to obtain the load analysis conditions and assessment locations of the rear bearing case within the engine envelope according to the ultimate tensile strength and yield strength limits, and the load analysis conditions include the ultimate load analysis condition and the limit load analysis condition; The external load acquisition module is used to determine the external load under the load analysis condition through the stress component matrix algorithm; The rear bearing case static test piece includes a plurality of first actuators arranged on the auxiliary mounting lugs of the rear bearing case, a plurality of second actuators arranged on the support adapter case, and a temperature field control device arranged at the position of the load-bearing strut close to the rear bearing case; The equivalent module is used to equivalently process the force loads in the external load and the basic load respectively according to the force load equivalent logic; The temperature field construction module is used to construct the temperature field of the ultimate load analysis condition and the temperature field of the limit load analysis condition respectively.

[0061] Obviously, those skilled in the art should understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the embodiments of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A design method for high-temperature static test of a rear bearing casing, characterized in that Including: According to the ultimate tensile strength and the yield strength limit, obtain the load analysis conditions and the assessment parts of the rear bearing case within the engine envelope. The load analysis conditions include the ultimate load analysis condition and the limit load analysis condition; Determine the external loads under the load analysis conditions through the stress component matrix algorithm; Install a plurality of first actuators on the auxiliary mounting lugs of the rear bearing case, install a plurality of second actuators on the fulcrum adapter case, and set a temperature field control device at the position of the bearing strut close to the rear bearing case to construct a static test piece of the rear bearing case; According to the force load equivalence logic, respectively equivalent the force loads in the external loads and the basic loads, and respectively construct the temperature field of the ultimate load analysis condition and the temperature field of the limit load analysis condition; Allocate the equivalent loads to the first actuators and the second actuators, first conduct the limit load test through the temperature field of the limit load analysis condition and the equivalent loads of the limit load analysis condition, and then conduct the ultimate load test through the temperature field of the ultimate load analysis condition and the equivalent loads of the ultimate load analysis condition.

2. The design method of the high-temperature static test for the rear bearing housing according to claim 1, characterized in that According to the ultimate tensile strength and the yield strength limit, obtain the load analysis conditions and the assessment parts of the rear bearing case within the engine envelope, including: Obtain the stress field of each working state within the engine envelope through the simulation method, and obtain the equivalent stress at each position on the rear bearing case according to the stress field; According to the equivalent stress and the yield strength limit, calculate the yield strength reserve at each position in each working state, and take the working state with the smallest yield strength reserve among all the working states as the limit load analysis condition; According to the equivalent stress and the ultimate tensile strength, calculate the ultimate strength reserve at each position in each working state, and take the working state with the smallest ultimate strength reserve among all the working states as the ultimate load analysis condition; Extract all the positions where the yield strength reserve is within the yield strength threshold range under the limit load analysis condition, extract all the positions where the ultimate strength reserve is within the ultimate strength threshold range under the limit load analysis condition, and take all the extracted positions as the assessment parts.

3. The high-temperature static test design method of the rear bearing housing according to claim 1, characterized in that Determine the external loads under the load analysis conditions through the stress component matrix algorithm, including: Obtain multiple sets of maneuver overload combination coefficients representing the external loads during maneuver flight; For each set of the maneuver overload combination coefficients, calculate the product of the second stress result under each unit maneuver overload and its corresponding maneuver overload coefficient, and sum all the products to obtain the external load stress; According to the material strength limit and the external load equivalent stress of the external load stress, calculate the material strength reserve under each set of the maneuver overload combination coefficients, and take the maneuver overload combination coefficient with the smallest material strength reserve as the external load, where the material strength limit includes the ultimate tensile strength and the yield strength limit, and the material strength reserve includes the yield strength reserve and the ultimate strength reserve.

4. The high-temperature static test design method of the rear bearing housing according to claim 1, wherein According to the force load equivalence logic, respectively equivalent the force loads in the external loads and the basic loads, including: Obtain the force loads in the basic loads that cannot be directly loaded during the high-temperature static test; Calculate the equivalent stress at the assessment location generated by the external load and each of the force loads at the assessment location respectively, and obtain the external equivalent force load according to the force load equivalence logic with the deviation of the equivalent stress at each assessment location within the set deviation range.

5. The design method of the high-temperature static test for the rear bearing housing according to claim 4, wherein It further includes: Respectively correct each of the external equivalent force loads through the temperature coefficient to obtain the final external equivalent force load.

6. The design method of the high-temperature static test of the rear bearing housing according to claim 4, characterized in that It further includes: Perform sensitivity analysis on each of the force loads to obtain the influence factor, and obtain the final force load after removing the force loads with the influence factor less than the threshold value, where the final force load includes the pressure load and the torque.

7. The design method of the high-temperature static test for the rear bearing housing according to claim 6, characterized in that Performing sensitivity analysis on each of the force loads to obtain the influence factor includes: For the load analysis condition, unidirectionally load the temperature load and each force load in the basic load to the rear bearing casing, and obtain the first stress result and the stress result at the assessment location under the temperature load and each of the force loads through the simulation method; Respectively calculate the product of the first stress result under the temperature load and each of the force loads and its corresponding safety factor, sum all the products and perform stress equivalence to obtain the equivalent stress of the basic load, and calculate the sum of the equivalent stress of the basic load and the equivalent stress of the external load; Calculate the ratio of the stress result at the assessment location under each of the force loads to the sum to obtain the influence factor of the force load.

8. The post-carrying force casing high-temperature static test design method according to claim 1, wherein, Respectively construct the temperature field of the ultimate load analysis condition and the temperature field of the limit load analysis condition, including: For the limit load analysis condition, generate a temperature field identical to the engine state through the temperature field control device as the temperature field of the limit load analysis condition; For the ultimate load analysis condition, respectively calculate the temperature gradient under the ultimate load analysis condition through the static test of the casing and the material tensile strength, linear expansion coefficient, elastic modulus and casing temperature gradient during the engine service of the casing, and construct the temperature field of the ultimate load analysis condition through the temperature field control device and the temperature gradient.

9. A high-temperature static test design system for a rear bearing casing, characterized in that It includes: A load analysis condition and assessment location determination module, which is used to obtain the load analysis condition and assessment location of the rear bearing casing within the engine envelope according to the ultimate tensile strength and yield strength limits, and the load analysis condition includes the ultimate load analysis condition and the limit load analysis condition; An external load acquisition module, which is used to determine the external load under the load analysis condition through the stress component matrix algorithm; A rear bearing casing static test piece, which includes a plurality of first actuators arranged on the auxiliary mounting joints of the rear bearing casing, a plurality of second actuators arranged on the support adapter casing, and a temperature field control device arranged at the position of the load-bearing strut close to the rear bearing casing; An equivalence module, which is used to respectively perform equivalence on the external load and the force load in the basic load according to the force load equivalence logic; A temperature field construction module, which is used to respectively construct the temperature field of the ultimate load analysis condition and the temperature field of the limit load analysis condition.

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