A method for installing a biaxial compressor test piece on a compressor test bench

Abstract

The present application provides a method for installing a biaxial compressor test piece on a compressor test bench, which belongs to the field of aviation engine testing, and comprises: constructing a simulation test piece, and positioning and installing an exhaust duct support seat by means of the simulation test piece; installing the biaxial compressor test piece having an independent support structure on the exhaust duct support seat; arranging a first dial indicator and a second dial indicator on the exhaust duct support seat and the independent support structure, respectively; providing at least two tightening devices at symmetrical positions on the front side of the independent support structure, and moving the biaxial compressor test piece toward one side of the internal exhaust duct by the tightening devices. During the movement, the biaxial compressor test piece is controlled to have no horizontal deflection according to the first dial indicator; when the biaxial compressor test piece is docked with the positioning stop of the internal exhaust duct, judging whether the biaxial compressor test piece and the positioning stop of the internal exhaust duct are in fit according to the second dial indicator, and if so, connecting the biaxial compressor test piece and the internal exhaust duct by fasteners.

Description

Technical Field

[0001] The present application relates to the field of aero-engine testing, and in particular to a method for installing a biaxial compressor test piece on a compressor test bench. Background Art

[0002] Compressor testers are essential equipment for performance verification and optimization research of aircraft engine compression components, and biaxial compressor testers are particularly crucial for studying the aerodynamic performance of engine compression systems. Biaxial compressor testers can simulate the actual operating conditions of the entire aircraft engine compression system, enabling research on the matching characteristics of high- and low-pressure compressors and transient performance.

[0003] The dual-axis compressor test is characterized by high shaft speed, high exhaust pressure and temperature. The reliability of the connection between the dual-axis compression system test piece and the equipment will directly affect the stability of the test operation. This is especially important for the structure with the high and low pressure drive shafts input on the same side (that is, the structure type where the high and low pressure shaft power are both input from the exhaust side).

[0004] The installation and connection process of the biaxial compression system test piece and the compressor tester is an important consideration during the use of the equipment. The existing installation method of the biaxial compression system test piece and the exhaust duct in the compressor tester is very difficult. Summary of the Invention

[0005] The purpose of the present application is to provide a method for installing a biaxial compressor test piece on a compressor test bench, so as to solve or alleviate at least one problem in the background technology.

[0006] The technical solution of the present application is: a method for installing a biaxial compressor test piece on a compressor test bench, comprising:

[0007] Construct a simulation test piece, and use it to position and install the exhaust duct support seat, so that the concentricity deviation between the simulation test piece and the exhaust duct support seat meets the equipment operation requirements;

[0008] Install the biaxial compressor test piece with an independent support structure and the exhaust duct support seat, and adjust the concentricity at the same time to ensure that the concentricity of the biaxial compressor test piece and the exhaust duct support seat meets the requirements;

[0009] A first dial indicator and a second dial indicator are respectively provided on the exhaust duct support seat and the independent support structure, for respectively monitoring the displacement changes of the internal exhaust duct and the independent support structure;

[0010] At least two tightening devices are provided at symmetrical positions on the front side of the independent support structure. The tightening devices are used to move the dual-axis compressor test piece toward the side of the exhaust duct. During the movement, the dual-axis compressor test piece is controlled to have no horizontal deflection according to the first dial indicator. At the same time, the inner shaft of the dual-axis compressor test piece is rotated to mesh with the inner shaft sleeve of the equipment shaft system.

[0011] When the biaxial compressor test piece is docked with the positioning stop of the internal exhaust duct, determine whether the circumferential gap at the positioning stop is uniform. At the same time, determine whether the biaxial compressor test piece and the positioning stop of the internal exhaust duct are in fit according to the second dial indicator. If they are in fit, connect the biaxial compressor test piece and the internal exhaust duct with fasteners.

[0012] Preferably, the simulation test piece has a mounting interface that matches the positioning stop of the internal exhaust duct and a power input shaft with the same structure and size as the dual-axis compressor test piece.

[0013] Preferably, the concentricity deviation between the simulated test piece and the exhaust duct support seat is no more than 0.03 mm.

[0014] Preferably, the process of installing the biaxial compressor test piece with an independent support structure on the exhaust duct support seat and adjusting the concentricity is as follows:

[0015] Place the biaxial compressor test piece with an independent support structure on the working platform of the compressor tester, move the biaxial compressor test piece to the positioning stop, and make the biaxial compressor test piece and the positioning stop of the exhaust duct docking;

[0016] A laser alignment instrument is installed on the transmission shaft system. According to the measurement results of the laser alignment instrument, the horizontal concentricity and left and right runout of the independent support structure are adjusted so that the concentricity deviation between the dual-axis compressor test piece and the exhaust duct support seat meets the requirements.

[0017] Preferably, the difference between the concentricity deviation between the biaxial compressor test piece and the exhaust duct support seat and the concentricity deviation between the exhaust duct support seat and the simulation test piece is not greater than 0.05 mm.

[0018] Preferably, two first dial indicators and two second dial indicators are installed on the exhaust duct support seat and the independent support structure and are evenly distributed on both sides of the axis of the dual-axis compressor test piece.

[0019] Preferably, the tightening device is a jack.

[0020] The method of the present application can reduce the difficulty of installing a dual-axis compressor test piece with an independent support structure on a compressor test bench, reduce the impact of the compressor test bench installation on the positioning function of the exhaust duct support seat, and improve the centering accuracy of the installation interface axis of the dual-axis compressor test piece and the positioning stop axis of the internal exhaust duct during the installation process, thereby improving the stability of the dual-axis compressor test piece and the exhaust duct support system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0022] Figure 1 It is a schematic diagram of the structure of a compressor tester in the prior art.

[0023] Figure 2 A schematic diagram of the common installation structure of a dual-axis compressor test piece and the exhaust duct.

[0024] Figure 3 This is a schematic diagram of the second installation structure of a common dual-axis compressor test piece and exhaust duct.

[0025] Figure 4 The following is a schematic diagram of the common installation structure of the dual-axis compressor test piece and the exhaust duct.

[0026] Figure 5 The figure is a schematic diagram of the installation structure of the existing dual-axis compressor test piece with an independent support structure and the exhaust duct.

[0027] Figure 6 Schematic diagram of the method of this application.

[0028] Figure 7 This is a schematic diagram of the installation of the simulated test piece and the exhaust duct support seat in this application.

[0029] Figure 8 This is a schematic diagram of the formal dual-axis compressor test piece and the exhaust duct docking in this application. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0031] like Figure 1As shown, the same-side input compressor tester 100 typically includes a biaxial compressor test piece 10, an exhaust duct 20, a torque transmission shaft 30, a gearbox 40, a speed increaser 50, and a drive unit 60. The biaxial compressor test piece 10 typically includes a low-pressure compressor 11 (or fan) and a high-pressure compressor 12, located at the front of the compressor tester 100. The exhaust duct 20 includes a bypass duct 22 and a duct 21, with the bypass duct 22 positioned between the low-pressure compressor 11 and the high-pressure compressor 12. The drive unit 60 includes a first drive unit 61 and a second drive unit 62, both located at the rear of the exhaust duct. Both drive units 61 and 62 are connected to the torque transmission shaft 30 via the speed increaser 50 and gearbox 40, thereby driving the low-pressure compressor 11 and the high-pressure compressor 12.

[0032] The installation of the compressor tester 100 and the biaxial compressor test piece 10 mainly realizes two functions. One is to realize the reliable connection between the biaxial compressor test piece 10 and the exhaust duct 20; the other is to realize the precise alignment of the power input shaft of the biaxial compressor test piece 10 and the tester equipment shaft system to ensure the smooth operation of the shaft system.

[0033] Common installation structures of the compressor tester 100 and the biaxial compressor test piece 10 mainly include the following three forms:

[0034] 1) If Figure 2 In the schematic diagram of the mounting structure shown, the internal exhaust duct 21 serves as the axial and radial positioning reference for the compressor tester 100. Furthermore, the internal exhaust duct 21 is connected to the biaxial compressor test piece 10 through a positioning stop 23. The biaxial compressor test piece 10 is directly cantilevered and fixed to the internal exhaust duct 21, sharing an exhaust duct support base 24 with the internal exhaust duct 21. A drive shaft 31 is installed within the internal exhaust duct 21, and the axis of the drive shaft 31 and the central axis of the positioning stop 23 meet the alignment requirements of the drive shaft 31.

[0035] In this structural state, the exhaust mounting casing of the dual-axis compressor test piece 10 is directly docked with the positioning stop 23 of the internal exhaust duct 21, so that the input shaft of the dual-axis compressor test piece 10 and the transmission shaft system 31 can be aligned, and its installation can be completed.

[0036] 2) If Figure 3In the second schematic diagram of the mounting structure, the internal exhaust duct 21 serves as the axial and radial positioning reference for the compressor tester 100. Furthermore, the internal exhaust duct 21 is connected to the biaxial compressor test piece 10 through a positioning stop 23. The biaxial compressor test piece 10 is directly cantilevered and fixed to the internal exhaust duct 21, sharing an exhaust duct support base 24 with the internal exhaust duct 21. There is no exhaust duct shafting within the internal exhaust duct 21. The power input shaft of the biaxial compressor test piece 10 passes through the axis of the internal exhaust duct 21 and is directly connected to the output shaft of the transmission system of the compressor tester 100.

[0037] In this structural state, after the exhaust mounting casing of the biaxial compressor test piece 10 is docked with the positioning stop 23 of the internal exhaust duct 21, it is necessary to align the input shaft of the biaxial compressor test piece 10 and the output shaft of other equipment of the compressor tester 100. After the axial concentricity requirements are met, the installation of the biaxial compressor test piece 10 can be completed.

[0038] 3) If Figure 4 In the third schematic diagram of the mounting structure, the biaxial compressor test specimen 10 and the internal exhaust duct 21 are independently supported. The biaxial compressor test specimen 10 has its own front support seat 13 and rear support seat 14, with the rear support seat 14 serving as the axial and radial positioning reference. The internal exhaust duct 21 is unpositioned and is connected to the biaxial compressor test specimen 10 via a positioning stop 23. The exhaust duct support seat 24 is movable. Once connected to the biaxial compressor test specimen 10, the internal exhaust duct 21 can move freely as the test specimen expands thermally and changes position. There is no drive shaft system within the internal exhaust duct 21. The power input shaft of the biaxial compressor test specimen 10 passes through the axis of the internal exhaust duct 21 and connects to the output shaft of the transmission system of the compressor tester 100.

[0039] In this structural state, the input shaft of the biaxial compressor test piece 10 and the output shafts of the various devices of the compressor tester 100 can first be aligned with the output shaft systems of the various devices of the compressor tester 100 to meet the axis concentricity requirements, and then the position of the internal exhaust duct 21 is adjusted, and the biaxial compressor test piece 10 is docked with the positioning stop 23 of the internal exhaust duct 21, thus completing the installation of the biaxial compressor test piece 10.

[0040] The above three installation forms can relatively easily achieve the docking and installation of the biaxial compressor test piece 10 and the various devices of the compressor tester 100. On the biaxial compressor tester with the same side input, the second type of exhaust duct structure is provided. However, since the biaxial compressor test piece 10 is often relatively long in axial direction, it needs to be independently supported. This leads to the phenomenon of docking and installation of the second type of exhaust duct structure with the biaxial compressor test piece 10 with an independent support structure. The specific structural form is as follows: Figure 5The combination of the dual-axis compressor test piece 10 and the exhaust duct of this structure is difficult to install according to the above method. The difficulties are mainly manifested in the following five aspects:

[0041] 1) Due to the high precision of the joints between the biaxial compressor test specimen 10 and the compressor tester 100, the joint adjustment of the joints 23 is difficult when the biaxial compressor test specimen 10, which has an independent support structure (i.e., the front support seat 13 and the rear support seat 14), is connected to the exhaust duct 21, given the presence of axial and radial positioning points on the exhaust duct support seat 24.

[0042] 2) The twin-shaft compressor test piece 10 and the concentric inner shaft were installed using a sleeve-gear torque transmission and blind-mounted docking method. The outer shaft misalignment directly led to difficulties in the inner shaft sleeve-gear docking.

[0043] 3) During the docking process of the positioning stop 23, it is difficult to ensure that the axis of the stop of the biaxial compressor test piece 10 and the axis of the stop of the internal exhaust duct 21 are completely aligned. As a result, if the exhaust duct's supporting and positioning capacity is insufficient after the two are rigidly connected, the biaxial compressor test piece 10 will cause the position of the internal exhaust duct 21 to shift, thereby destroying the positioning function of the internal exhaust duct 21.

[0044] 4) Once the positioning function of the internal exhaust duct 21 is destroyed, it is very difficult for the internal exhaust duct 21 to return to its original positioning state when the biaxial compressor test piece 10 is connected to the internal exhaust duct 21;

[0045] 5) Under the above-mentioned conditions, the concentricity of the transmission system is aligned with the axis of the biaxial compressor test piece 10 as a reference. Since the front support seat 13 and the exhaust duct support seat 24 of the biaxial compressor test piece 10 may be unstable due to virtual positions, the concentricity of the shaft system will often vary over a large range during the later operation, posing a greater risk to the operation of various equipment of the compressor tester 100.

[0046] In order to solve the problem of installation difficulties under the dual constraints of the independent support state of the biaxial compressor test piece 10 and the internal exhaust duct 21 and the precise stopper docking interface, in order to solve the problem of uncontrollable alignment effect of the stopper axis of the biaxial compressor test piece 10 and the stopper axis of the internal exhaust duct 21 during the docking process, and in order to solve the problem of the state change of the exhaust duct support seat 24 that may be caused after the biaxial compressor test piece 10 is connected to the internal exhaust duct 21, and to improve the stability of the front support seat 13 and the exhaust duct support seat 24 of the biaxial compressor test piece 10 after installation, the present application provides a method for installing a biaxial compressor test piece on a compressor tester bench.

[0047] like Figure 6 As shown, the method for installing the biaxial compressor test piece on the compressor test bench provided in this application includes the following process:

[0048] S10, constructing a simulation test piece, positioning and installing the exhaust duct support seat 24 through the simulation test piece, and ensuring that the concentricity of the simulation test piece and the exhaust duct support seat 24 meets the equipment operation requirements.

[0049] like Figure 7 As shown, the simulated test piece 71 has a mounting interface that mates with the positioning stop 23 of the internal exhaust duct 21 and a power input shaft with the same structure and dimensions as the dual-axis compressor test piece 10. The simulated test piece 71 is cantilevered and mounted on the internal exhaust duct 21 and secured via connectors. Using the power output end of the compressor tester 100 as a reference, a laser alignment device 72 is used to maintain synchronous rotation of the shaft system. The concentricity of the dual-axis compressor test piece 10 and the drive shaft system 31 is tracked and checked. The position of the exhaust duct support 24 is simultaneously adjusted to correct its concentricity with the power input shaft of the simulated test piece 71 until it meets the equipment's operational requirements. The data is then recorded.

[0050] In some embodiments of the present application, the concentricity deviation between the simulated test piece 71 and the exhaust duct support seat 24 is generally no greater than 0.03 mm.

[0051] In this application, the simulation test piece 71 is equivalent to installing a positioning shaft in the center of the hollow internal exhaust duct 21, and the internal exhaust duct 21 is adjusted by the concentricity of the positioning shaft and the transmission shaft system 31 to complete the precise positioning of the internal exhaust duct 21.

[0052] After the simulated test piece 71 is installed on the exhaust duct support base 24, the contact state of each supporting surface of the exhaust duct support base 24 is checked to ensure stable and reliable support. The concentricity data of the simulated test piece 71 and the transmission shaft system 31 are re-measured. After confirmation, the simulated test piece 71 is removed.

[0053] S20, installing the biaxial compressor test piece 10 with the independent support structure 73 and the exhaust duct support seat 24, and adjusting the concentricity of the biaxial compressor test piece 10 and the exhaust duct support seat 24 so that the concentricity of the biaxial compressor test piece 10 and the exhaust duct support seat 24 meets the requirements.

[0054] like Figure 8 As shown, the biaxial compressor test piece 10 with the independent support structure 73 is placed on the working platform of the compressor tester 100, and the biaxial compressor test piece 10 is moved to the positioning stop 23 so that it is in a close docking state with the positioning stop 23 of the inner exhaust duct 21. At this time, the inner shaft sleeve teeth of the biaxial compressor test piece 10 are not engaged and the positioning stop 23 is not in contact.

[0055] Install a laser alignment device 72 on the drive shaft system 31, and use the end of the drive shaft system 31 as a reference to adjust the concentricity of the dual-axis compressor test specimen 10 relative to the equipment shaft system. First, perform the shaft system pitch concentricity adjustment. Adjust the horizontal concentricity of the independent support structure 73 based on the measurement results of the laser alignment device 72. Use the tracking function of the laser alignment device 72 for real-time monitoring. Once the adjustment is in place, check the final horizontal concentricity adjustment results using the measurement mode. Next, perform the shaft system runout concentricity adjustment. Adjust the left and right runout of the independent support structure 73 based on the measurement results of the laser alignment device 72. Use the tracking function of the laser alignment device 72 for real-time monitoring during the adjustment process. Once the adjustment is in place, check the final runout concentricity adjustment results using the measurement mode. Check the shaft system alignment results to ensure that the deviation from the test results of the simulated test specimen 71 is no more than 0.05 mm, ensuring that the mounting interface of the dual-axis compressor test specimen 10 can be smoothly installed within the positioning stop 23 of the exhaust duct 21.

[0056] S30, respectively setting a first dial indicator 75 and a second dial indicator 76 on the exhaust duct support seat 24 and the independent support structure 73, for monitoring the displacement changes of the internal exhaust duct 21 and the independent support structure 73 respectively.

[0057] like Figure 8 As shown, a first dial indicator 75 is installed on the exhaust duct support seat 24 on one side of the transmission shaft system 31, which is used to monitor the displacement change of the internal exhaust duct 21 toward the side of the equipment shaft system during the docking process of the dual-axis compressor test piece 10 and the positioning stop 23 of the internal exhaust duct 21; a second dial indicator 76 is also installed on the independent support structure 73 located on one side of the internal exhaust duct 21, which is used to monitor the translation state of the independent support structure 73.

[0058] In the preferred embodiment of the present application, two dial indicators are installed on the exhaust duct support seat 24 and the independent support structure 73, and the two dial indicators are evenly distributed in the circumferential direction.

[0059] S40. At least two tightening devices 74 are provided at symmetrical positions on the front side of the independent support structure 73. The twin-axis compressor test piece 10 is moved toward the side of the internal exhaust duct 21 through the tightening devices 74. During the movement, the twin-axis compressor test piece 10 is controlled to have no horizontal deviation according to the first dial indicator 75. At the same time, the inner shaft of the twin-axis compressor test piece 10 is rotated so that the inner shaft is engaged with the inner shaft sleeve of the equipment shaft system.

[0060] In this application, the jacking device 74 is a jack. At least two jacking devices 74 are symmetrically positioned on the front side (i.e., the intake side) of the independent support structure 73. The biaxial compressor test specimen 10 is slowly translated horizontally, moving it toward the internal exhaust duct 21. During translation, the pointer changes of the first dial indicator 75 are monitored to ensure that the readings of the two first dial indicators 75 are consistent and that the biaxial compressor test specimen 10 has no horizontal deflection. During this movement, the inner shaft rotor of the biaxial compressor test specimen 10 is slowly rotated continuously until the inner shaft of the biaxial compressor test specimen 10 is smoothly meshed with the inner shaft sleeve gear of the equipment shaft system.

[0061] S50, when the biaxial compressor test piece 10 is docked with the positioning stop 23 of the internal exhaust duct 21, determine whether the circumferential gap at the positioning stop is uniform, and at the same time determine whether the biaxial compressor test piece 10 and the positioning stop 23 of the internal exhaust duct 21 are fitted according to the second dial indicator 76. After fitting, connect the biaxial compressor test piece 10 and the internal exhaust duct 21 by fasteners.

[0062] When the biaxial compressor test piece 10 is nearly fully aligned with the locating stop 23 of the internal exhaust duct 21, measure the circumferential clearance at the locating stop 23 for uniformity. Simultaneously, observe the change in the pointer of the second dial indicator 76. If the pointer reading increases, it indicates that the locating stop 23 is substantially aligned axially. Stop moving the independent support structure 73. At this point, connect the biaxial compressor test piece 10 to the internal exhaust duct 21 using fasteners.

[0063] In addition, with the shaft system at the end of the biaxial compressor test piece as a reference, the concentricity of the biaxial compressor test piece 10 and the transmission shaft system 31 is secondary detected using a laser alignment instrument 72. If the deviation value is found to be greater than the allowable range of the operating standard, the position of the transmission shaft system 31 is adjusted to meet the alignment requirements.

[0064] The installation method of the dual-axis compressor test piece on the compressor tester bench provided in the present application uses the outer shaft of the transmission shaft system of the compressor tester 100 as the common shaft system alignment adjustment reference for the dual-axis compressor test piece 10 and the internal exhaust duct 21 (regardless of the dual-axis compressor test piece 10 and the transmission shaft system 31, the inner shaft and the outer shaft rely on design, processing and assembly to ensure the concentricity requirements between each other. Only the concentricity between the outer shafts needs to be adjusted, and the inner shafts can achieve adaptive docking. Therefore, the present application does not involve the concentricity adjustment of the inner shaft of the dual-axis shaft system), adjusts the relative position relationship between the dual-axis compressor test piece 10 and the internal exhaust duct 21, thereby indirectly achieving the concentricity of the shaft systems of the two and ensuring their smooth docking.

[0065] The method of the present application can reduce the difficulty of installing a dual-axis compressor test piece with an independent support structure on a compressor test bench, reduce the impact of the compressor test bench installation on the positioning function of the exhaust duct support seat 24, and improve the centering accuracy of the installation interface axis of the dual-axis compressor test piece and the positioning stop axis of the internal exhaust duct 21 during the installation process, thereby improving the stability of the dual-axis compressor test piece and the exhaust duct support system.

[0066] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for installing a biaxial compressor test piece on a compressor test bench, characterized in that: include: Construct a simulation test piece, and use it to position and install the exhaust duct support seat, so that the concentricity deviation between the simulation test piece and the exhaust duct support seat meets the equipment operation requirements; Install the biaxial compressor test piece with an independent support structure and the exhaust duct support seat, and adjust the concentricity at the same time to ensure that the concentricity of the biaxial compressor test piece and the exhaust duct support seat meets the requirements; A first dial indicator and a second dial indicator are respectively provided on the exhaust duct support seat and the independent support structure, for respectively monitoring the displacement changes of the internal exhaust duct and the independent support structure; At least two tightening devices are provided at symmetrical positions on the front side of the independent support structure. The tightening devices are used to move the dual-axis compressor test piece toward the side of the exhaust duct. During the movement, the dual-axis compressor test piece is controlled to have no horizontal deflection according to the first dial indicator. At the same time, the inner shaft of the dual-axis compressor test piece is rotated to mesh with the inner shaft sleeve of the equipment shaft system. When the biaxial compressor test piece is docked with the positioning stop of the internal exhaust duct, determine whether the circumferential gap at the positioning stop is uniform. At the same time, determine whether the biaxial compressor test piece and the positioning stop of the internal exhaust duct are in fit according to the second dial indicator. If they are in fit, connect the biaxial compressor test piece and the internal exhaust duct with fasteners.

2. The method for installing a biaxial compressor test piece on a compressor test bench according to claim 1, wherein: The simulation test piece has a mounting interface matched with a positioning stop of the internal exhaust duct and a power input shaft with the same structure and size as the dual-axis compressor test piece.

3. The method for installing a biaxial compressor test piece on a compressor test bench according to claim 1 or 2, wherein: The concentricity deviation between the simulated test piece and the exhaust duct support seat is no more than 0.03 mm.

4. The method for installing a biaxial compressor test piece on a compressor test bench according to claim 3, wherein: The process of installing the biaxial compressor test piece with an independent support structure and the exhaust duct support seat and adjusting the concentricity is as follows: Place the biaxial compressor test piece with an independent support structure on the working platform of the compressor tester, move the biaxial compressor test piece to the positioning stop, and make the biaxial compressor test piece and the positioning stop of the exhaust duct docking; A laser alignment instrument is installed on the transmission shaft system. According to the measurement results of the laser alignment instrument, the horizontal concentricity and left and right runout of the independent support structure are adjusted so that the concentricity deviation between the dual-axis compressor test piece and the exhaust duct support seat meets the requirements.

5. The method for installing a biaxial compressor test piece on a compressor test bench according to claim 4, wherein: The difference in concentricity deviation between the biaxial compressor test piece and the exhaust duct support seat and the concentricity deviation between the exhaust duct support seat and the simulation test piece is no more than 0.05 mm.

6. The method for installing a biaxial compressor test piece on a compressor test bench according to claim 5, wherein: The exhaust duct support seat and the independent support structure are equipped with two first dial indicators and two second dial indicators, which are evenly distributed on both axial sides of the dual-axis compressor test piece.

7. The method for installing a biaxial compressor test piece on a compressor test bench according to claim 1, wherein: The tightening device is a jack.

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