Underwater rocket engine test bed with in-situ calibration mechanism

Abstract

The invention relates to an underwater rocket engine test bed with an in-situ calibration mechanism, which belongs to the technical field of rocket engine testing and comprises a support frame, a main loading mechanism, a movable frame, a lateral flexibility test assembly I, a lateral flexibility test assembly II, a lateral sensor calibration assembly I, a lateral sensor calibration assembly II and a main thrust test assembly. The support frame is arranged on the base; the main loading mechanism is arranged on the support frame; the movable frame is arranged on the base; the plurality of lateral flexibility test assemblies I and the plurality of lateral flexibility test assemblies II are respectively arranged on the fixed frame and the fixed frame cross beam and are connected with the movable frame; the two first lateral sensor calibration assemblies and the two second lateral sensor calibration assemblies are arranged on the fixed frame and the fixed frame cross beam respectively and connected with the movable frame. The main thrust testing assembly is arranged on the supporting frame and connected with the movable frame. According to the invention, rapid calibration can be carried out underwater so as to improve the test precision and efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of rocket engine testing, and in particular to an underwater rocket engine test bench with an in-situ calibration mechanism. Background Art

[0002] Before the engine test, the test system and sensors of the test bench need to be calibrated to ensure the credibility of the test results.

[0003] In-situ calibration refers to the comparison and calibration of the working sensor with a higher-level precision sensor, i.e., a standard sensor, under the condition of normal installation at the test site. Since the working sensor only needs to be installed once, the system characteristics of the test bench remain unchanged, so that the sensor has the same stress conditions during calibration and testing, such as sensor deformation, mutual interference among channels, etc., which improves the measurement accuracy of the system.

[0004] The six-component force test bench is a high-order system. If the in-situ calibration is not adopted, but only the traditional static calibration method is used, the sensor is removed from the test bench for static calibration and then installed back to the original position for use. This is equivalent to using the characteristic indicators of the sensor as the characteristic indicators of the force measurement system, which will inevitably affect the accuracy of the measurement results, thereby reducing the measurement accuracy of the thrust vector eccentricity.

[0005] In the prior art, the test bench needs to be calibrated on the water surface and then sent underwater for testing. However, due to the complex underwater environment and the existence of undercurrents, it is necessary to re-calibrate it in situ underwater. However, the existing in-situ calibration mechanism cannot perform rapid loading and unloading underwater, and cannot perform in-situ calibrating of the test bench. Summary of the invention

[0006] The purpose of the present invention is to address the problems existing in the background technology and to propose an underwater rocket engine test bench with an in-situ calibration mechanism that can perform rapid calibration underwater to improve test accuracy and efficiency.

[0007] The technical solution of the present invention is as follows: an underwater rocket engine test bench with an in-situ calibration mechanism comprises a test frame, the test frame comprises a base, two sets of fixed frames arranged on the base, and fixed frame crossbeams arranged on the two sets of fixed frames; and further comprises: A support frame, arranged on the base; A main loading mechanism, arranged on the support frame; A movable frame, arranged above the base; The lateral flexibility test assembly 1 and the lateral flexibility test assembly 2 are both provided in plurality and are respectively arranged on the fixed frame and the fixed frame crossbeam and connected to the movable frame; The lateral sensor calibration component 1 and the lateral sensor calibration component 2 are both provided with two and are respectively arranged on the fixed frame and the fixed frame crossbeam and connected to the movable frame; and, A main thrust test assembly is arranged on the support frame and connected to the moving frame; the main loading mechanism can abut against the main thrust test assembly.

[0008] Preferably, the support frame comprises a first load-bearing pier and a second load-bearing pier which are arranged on the base and have sliding holes, and a support rod which is arranged between the first load-bearing pier and the second load-bearing pier.

[0009] Preferably, the main loading mechanism includes a thrust electric cylinder 1 arranged on the load-bearing pier 1, a sensor 1 arranged on the output end of the thrust electric cylinder 1, a connecting rod crossbeam 1 arranged on the sensor 1, two push rods that are both arranged on the connecting rod crossbeam 1 and slide through the sliding hole, and a connecting rod crossbeam 2 arranged on the push rods.

[0010] Preferably, the movable frame includes a fixed platform 1 arranged above the base and connected to the lateral flexibility test assembly 1, the lateral flexibility test assembly 2, the lateral sensor calibration assembly 1 and the lateral sensor calibration assembly 2, a connecting frame arranged on the fixed platform 1, and a fixed platform 2 arranged on the connecting frame, and a transmission rod arranged on the fixed platform 2 and slidably connected to the connecting rod beam 2 and connected to the main thrust test assembly.

[0011] Preferably, the main thrust test assembly comprises a support rod 2 arranged on the load-bearing pier 2, a sensor 4 arranged on the support rod 2, and a push sleeve arranged on the transmission rod; a through groove and a crimping platform are arranged on the connecting rod crossbeam 2; the transmission rod is clearance-matched with the through groove; one end of the push sleeve is embedded in the crimping platform and can abut against the connecting rod crossbeam 2.

[0012] Preferably, the lower ends of the lateral flexibility test component 1 and the lateral flexibility test component 2 are respectively provided with sensor assembly brackets connected to the base and the fixed frame; the sensor assembly bracket includes a bottom plate arranged on the base, a mounting plate arranged on the bottom plate, a plurality of adjustment seats respectively arranged on the base and the bottom plate, a plurality of threaded rods corresponding to the adjustment seats and threadedly connected to the adjustment seats and respectively abutting against the bottom plate and the mounting plate, and fixing bolts arranged on the bottom plate and the mounting plate and threadedly connected to the base and the bottom plate, respectively.

[0013] Preferably, the lateral flexibility test component 1 and the lateral flexibility test component 2 have the same structure, and the lateral flexibility test component 1 includes a flexible connector arranged on the mounting plate, a sensor 2 arranged on one end of the flexible connector, and a connecting rod with one end arranged on the sensor 2 and the other end arranged on the fixed platform 1 or the fixed platform 2.

[0014] Preferably, both the lateral sensor calibration component 1 and the lateral sensor calibration component 2 are provided with a ball and socket connector connected to the movable frame; the lateral sensor calibration component 1 and the lateral sensor calibration component 2 have the same structure, and the lateral sensor calibration component 1 includes a thrust electric cylinder 2 arranged on the fixed frame crossbeam, a connecting device arranged on the output end of the thrust electric cylinder 2, and a sensor 3 arranged on the connecting device and connected to the ball and socket connector.

[0015] Preferably, the ball-and-socket connection comprises a connecting shaft arranged on the sensor three, a ball head arranged on the connecting shaft, a movable side ball seat slidably connected to the connecting shaft, and a connecting rod side ball seat arranged on the movable frame and connected to the movable side ball seat; cavities are arranged on the connecting rod side ball seat and the movable side ball seat, and the ball head can move in the cavity after assembly; the connecting shaft and the movable side ball seat are clearance-matched.

[0016] Preferably, a bull's eye ball alignment assembly is provided on the second load-bearing pier; the bull's eye ball alignment assembly is provided in plurality and is respectively located at the two sliding holes; the bull's eye ball alignment assembly includes a load-bearing pier provided on the second load-bearing pier, an adjusting bolt provided on the load-bearing pier and threadedly connected, a supporting head provided on the adjusting bolt, and a ball rotatably provided in the supporting head and slidably connected to the push rod.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: In the present invention, a rocket engine is placed on a moving frame, the rocket engine is fixed by the moving frame, a hook is installed on a hook on a base, and the device is lifted into water; it can operate underwater; the main loading mechanism is started, the main loading mechanism pushes the main thrust test assembly to move, the main thrust test assembly drives the moving frame to move, thereby driving the lateral flexibility test assembly 1 and the lateral flexibility test assembly 2 to move relative to each other, thereby obtaining the values ​​measured by the main loading mechanism and the values ​​measured by the main thrust test assembly, the lateral flexibility test assembly 1 and the lateral flexibility test assembly 2, and bringing a plurality of values ​​into a coupling model, thereby enabling the main thrust test assembly, the lateral flexibility test assembly 1 and the lateral flexibility test assembly 2 to be quickly calibrated in situ underwater and a decoupling matrix to be established, so as to ensure the accuracy of the test results.

[0018] In the present invention, when the main loading mechanism, lateral flexibility test component one or lateral flexibility test component two is working, the data generated by the other tested sensors two, three, and four will be collected together with the data generated by sensor one, and brought into the coupling formula for decoupling calculation. The coupling amount of the main loading mechanism to other sensors can be calculated, and in-situ calibration can be performed to correct errors. Compared with the sensor calibration in the prior art, it can be more accurate to adapt to the underwater environment and fill the gap of the current lack of underwater calibration devices.

[0019] Sensor 4 is pressurized by sensor 1, so that sensor 4 can receive pressure. Sensor 4 drives lateral flexibility test component 1 and lateral flexibility test component 2 to move through the movable frame, so as to obtain the values ​​generated by each test component, analyze the values, and bring them into the decoupling model for calculation, so as to calibrate sensor 4. After the calibration is completed, the connecting rod beam 2 is driven to reset by the thrust electric cylinder 1, so that the through groove is separated from the push sleeve, and no interference is caused to the push sleeve.

[0020] The pressure and tension generated by each sensor are coupled and calculated separately, then substituted into the coupling formula for decoupling and in-situ calibration to ensure the accuracy of the test results.

[0021] After the calibration is completed, the connecting device is retracted by driving the thrust electric cylinder 2, so that the connecting shaft drives the ball head to move, and the ball head moves to the middle of the cavity between the connecting rod side ball seat and the movable side ball seat, so that the ball head and the connecting rod side ball seat are in a relatively separated state, so that during the test, the lateral sensor calibration component 1 and the lateral sensor calibration component 2 do not contact the movable frame, and will not be interfered by the lateral sensor calibration component 1 and the lateral sensor calibration component 2 during the test, thereby ensuring the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the local enlarged structure at point A in the middle; Figure 3 It is a structural side view of an embodiment of the present invention; Figure 4 for Figure 3 A schematic diagram of the local enlarged structure at B in the middle; Figure 5 It is a structural front view of an embodiment of the present invention; Figure 6 for Figure 5 A cross-sectional view at position I in the middle; Figure 7 A top view of the structure of an embodiment of the present invention; Figure 8 for Figure 7 A schematic diagram of the local enlarged structure at C in the middle; Fig. 9 for Figure 7 A schematic diagram of the local enlarged structure at D in the middle; Fig.10 It is a partial structural cross-sectional view of an embodiment of the present invention; Fig.11 for Fig.10 A schematic diagram of the local enlarged structure at E in the middle; Fig.12 for Fig.10 A schematic diagram of the local enlarged structure at F in the middle; Fig.13 for Fig.10 Schematic diagram of the local enlarged structure at G in the middle; Fig.14 for Fig.10 Schematic diagram of the local enlarged structure at H in the middle; Fig.15 It is a structural schematic diagram of a support assembly in an embodiment of the present invention; Fig.16 It is a structural cross-sectional view of a flexible connector in an embodiment of the present invention.

[0024] Figure numerals: 1, test frame; 101, base; 102, fixed frame; 103, fixed frame crossbeam; 2, support frame; 201, load-bearing pier 1; 202, support rod; 203, load-bearing pier 2; 3, main loading mechanism; 301, thrust cylinder 1; 302, connecting rod crossbeam 1; 303, push rod; 304, sensor 1; 305, connecting rod crossbeam 2; 3051, through groove; 3052, crimping table; 4, moving frame; 401, fixed table 1; 402, connecting frame; 403, fixed table 2; 404, transmission rod; 51, lateral flexibility test assembly 1; 52, lateral flexibility test assembly 2; 501, sensor 2; 502, flexible connector; 503, connecting rod; 6 , sensor assembly bracket; 601, base plate; 602, mounting plate; 603, adjustment seat; 604, threaded rod; 605, fixing bolt; 7, ball and socket connector; 701, connecting rod side ball seat; 702, movable side ball seat; 703, connecting shaft; 704, ball head; 81, lateral sensor calibration component one; 82, lateral sensor calibration component two; 801, thrust electric cylinder two; 802, connecting device; 803, sensor three; 9, bull's eye ball alignment component; 901, load-bearing pier; 902, support head; 903, ball; 904, adjusting bolt; 10, main thrust test component; 1001, sensor four; 1002, support rod two; 1003, push sleeve. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0028] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0029] Embodiment 1 like Figure 1-16 As shown, the underwater rocket engine test bench with in-situ calibration mechanism proposed by the present invention includes a test frame 1 base 101, two sets of fixed frames 102 arranged on the base 101, and fixed frame crossbeams 103 arranged on the two sets of fixed frames 102; it also includes a support frame 2, a main loading mechanism 3, a moving frame 4, a lateral flexibility test assembly 1 51, a lateral flexibility test assembly 2 52, a lateral sensor calibration assembly 1 81, a lateral sensor calibration assembly 2 82, and a main thrust test assembly 10; the support frame 2 is arranged on the base 101; the main loading mechanism 3 is arranged on the support frame 2; the moving frame 4 is arranged above the base 101; the lateral flexibility test assembly 1 51 and the lateral flexibility test assembly 2 There are multiple lateral flexibility test assemblies 52, which are respectively arranged on the fixed frame 102 and the fixed frame beam 103 and connected to the moving frame 4; there are two lateral sensor calibration assemblies 81 and lateral sensor calibration assemblies 82, which are respectively arranged on the fixed frame 102 and the fixed frame beam 103 and connected to the moving frame 4; the main thrust test assembly 10 is arranged on the support frame 2 and connected to the moving frame 4; the main loading mechanism 3 can abut against the main thrust test assembly 10, and a sealed electrical box is arranged on both sides of the support frame 2 on the base 101 of the device to control the electrical components in the device, so that it can operate underwater, thereby enabling in-situ calibration operations to be performed underwater.

[0030] The support frame 2 includes a load-bearing pier 1 201 and a load-bearing pier 203 which are arranged on the base 101 and have sliding holes, and a support rod 202 arranged between the load-bearing pier 1 201 and the load-bearing pier 203; the load-bearing pier 1 201 and the support rod 202 both support the main loading mechanism 3, and the support rod 202 supports the main thrust test assembly 10, so that the main thrust test assembly 10 can be installed on the test frame 1, and the reliable connection between the load-bearing pier 1 201 and the support rod 202 can be ensured through the load-bearing pier 203.

[0031] At the same time, the measurement accuracy of the six-component test bench is also affected by the coupling of forces / torques in various dimensions. The coupling error is caused by the processing error of the test bench, the installation error and the slight deformation caused by the dynamic frame constraint. The early decoupling method was mainly structural decoupling. Although the flexible link is used to reduce the interference in all directions as much as possible, the flexible rod is not rigid. There is still an inevitable data coupling problem between the six components, resulting in a measurement error of 1% to 3%. According to JJF1560-2016, the national standard stipulates that the in-situ calibration process needs to be combined through calibration to calculate the coupling error caused by the mutual interference coupling phenomenon between the various channels.

[0032] In this embodiment, a rocket engine is placed on a movable frame 4, the rocket engine is fixed by the movable frame 4, a hook is installed on a hook on a base 101, and the device is hoisted into water; the main loading mechanism 3 is started, the main loading mechanism 3 pushes the main thrust test assembly 10 to move, the main thrust test assembly 10 drives the movable frame 4 to move, thereby driving the lateral flexibility test assembly 1 51 and the lateral flexibility test assembly 2 52 to move relative to each other, thereby obtaining the values ​​measured by the main loading mechanism 3 and the values ​​measured by the main thrust test assembly 10, the lateral flexibility test assembly 1 51 and the lateral flexibility test assembly 2 52, and bringing multiple values ​​into the coupling model, thereby enabling the main thrust test assembly 10, the lateral flexibility test assembly 1 51 and the lateral flexibility test assembly 2 52 to be quickly calibrated in situ underwater and the decoupling matrix to be established, so as to ensure the accuracy of the test results.

[0033] The lateral sensor calibration component 1 81 and the lateral sensor calibration component 2 82 apply force to the movable frame 4, so that the movable frame 4 transmits the force to the lateral flexibility test component 1 51 and the lateral flexibility test component 2 52, so that pressure can be applied to the lateral flexibility test component 1 51 and the lateral flexibility test component 2 52, thereby obtaining the lateral sensor calibration component 1 81, the lateral sensor calibration component 2 82, the lateral flexibility test component 1 51, the lateral flexibility test component 2 52, and the main thrust test component 10 The value of the lateral sensor calibration component 81 is compared with the value of each test component, and the value of the lateral sensor calibration component 82 is compared with the value of each test component. Through numerical analysis, the decoupling model is brought into calculation to calibrate the lateral flexibility test component 51 and the lateral flexibility test component 52, so that the lateral flexibility test component 51, the lateral flexibility test component 2 52 and the main thrust test component 10 can be calibrated quickly underwater to ensure the accuracy of the test results.

[0034] In the present invention, when the main loading mechanism 3, the lateral flexibility test component 1 51 or the lateral flexibility test component 2 52 are working, the data generated by the other tested sensors 2 501, sensor 3 804, and sensor 4 1001 will be collected together with the data generated by sensor 1 304, and brought into the coupling formula for decoupling calculation. The coupling amount of the main loading mechanism to other sensors can be calculated, and in-situ calibration can be performed to correct errors. Compared with the sensor calibration in the prior art, it can be more accurate to adapt to the underwater environment and fill the gap of the current lack of underwater calibration devices.

[0035] Embodiment 2 like Figure 1-16As shown, the present invention proposes an underwater rocket engine test bench with an in-situ calibration mechanism. Compared with the first embodiment, the main loading mechanism 3 in this embodiment includes a thrust cylinder 1 301 arranged on the bearing pier 201, a sensor 1 304 arranged on the output end of the thrust cylinder 1 301, a connecting rod beam 1 302 arranged on the sensor 1 304, two push rods 303 are arranged on the connecting rod beam 1 302 and slide through the sliding hole, and a connecting rod beam 2 305 is arranged on the push rod 303.

[0036] A bull's eye ball centering assembly 9 is provided on the load-bearing pier 203; multiple bull's eye ball centering assemblies 9 are provided and are respectively located at two sliding holes; the bull's eye ball centering assembly 9 includes a load-bearing pier 901 provided on the load-bearing pier 203, an adjusting bolt 904 provided on the load-bearing pier 901 and threadedly connected, a supporting head 902 provided on the adjusting bolt 904, and a ball 903 rotatably provided in the supporting head 902 and slidably connected to the push rod 303; two bull's eye ball centering assemblies 9 are provided at each push rod 303, the two bull's eye ball centering assemblies 9 are inclined at 45 degrees and the angle between the two bull's eye ball centering assemblies 9 is 90 degrees, the position of the supporting head 902 is adjusted by adjusting the bolt 904 so that the supporting head 902 drives the ball 903 to rest on the push rod 303, supports the push rod 303, so as to ensure the concentricity of the push rod 303 and ensure the smooth movement of the push rod 303, thereby ensuring the accuracy of the calibration result.

[0037] Furthermore, the moving frame 4 includes a fixed platform 401 arranged above the base 101 and connected to the lateral flexibility test assembly 1 51, the lateral flexibility test assembly 2 52, the lateral sensor calibration assembly 1 81 and the lateral sensor calibration assembly 2 82, a connecting frame 402 arranged on the fixed platform 1 401, and a fixed platform 2 403 arranged on the connecting frame 402, and a transmission rod 404 arranged on the fixed platform 2 403 and slidably connected to the connecting rod beam 2 305 and connected to the main thrust test assembly 10; the rocket engine is inserted into the fixed platform 1 401, the rocket engine is supported by the connecting frame 402, and then the end of the rocket engine is abutted by the fixed platform 2 403, and a closing groove and an inclined platform are provided on the fixed platform 1 401, which can be screwed in with bolts to clamp the rocket engine and support the rocket engine, so that the fixed platform 1 401 supports and fixes the rocket engine to prevent movement when viewed from the side.

[0038] Among them, the main thrust test assembly 10 includes a support rod 1002 arranged on the load-bearing pier 203, a sensor 1001 arranged on the support rod 1002, and a push sleeve 1003 arranged on the transmission rod 404; a through groove 3051 and a crimping platform 3052 are arranged on the connecting rod beam 305; the transmission rod 404 is clearance-matched with the through groove 3051; one end of the push sleeve 1003 is embedded in the crimping platform 3052 and can abut against the connecting rod beam 305. After starting, the rocket engine will push the fixed platform 403 to move, and the fixed platform 403 drives the transmission rod 404 to move, so that the transmission rod 404 squeezes the sensor 1001, and the support rod 1002 supports the sensor 1001, so that the thrust generated by the rocket engine can be measured.

[0039] In this embodiment, the sensor 1 304 is pushed to move by the thrust electric cylinder 1 301, the sensor 1 304 drives the connecting rod beam 1 302 to move, the connecting rod beam 1 302 drives the push rod 303 to move, the push rod 303 drives the connecting rod beam 2 305 to move, and the crimping table 3052 on the connecting rod beam 2 305 is pressed on the pushing sleeve 1003, so that the sensor 4 1001 can receive pressure, and the sensor 4 1001 drives the lateral flexibility test component 1 51 and the lateral flexibility test component 2 52 to move through the movable frame 4, and the values ​​generated by each test component can be obtained, analyzed, and brought into the decoupling model for calculation, so that the sensor 4 1001 can be calibrated. After the calibration is completed, the thrust electric cylinder 1 301 drives the connecting rod beam 2 305 to reset, so that the through groove 3051 is separated from the pushing sleeve 1003, and will not interfere with the pushing sleeve 1003.

[0040] When the rocket engine is working, pressure is applied through the transmission rod 404, and the transmission rod 404 passes through the through groove 3051 and the crimping table 3052 and is in a separated state from the connecting rod crossbeam 2 305. Therefore, the connecting rod crossbeam 2 305 will not interfere with the thrust generated by the transmission rod 404, and the accuracy of the test structure of the sensor 4 1001 can be ensured. The crimping table 3052 has a hemispherical structure, and the hemispherical structure of the push sleeve 1003 is matched, so that it can ensure a reliable connection when engaged and can also be quickly connected when separated. Compared with the square structure that requires edge alignment, this structure can automatically ensure the axis position and prevent it from shifting. In conjunction with the bull's eye ball alignment assembly 9, the connecting rod crossbeam 2 305 and the push sleeve 1003 can be reliably connected.

[0041] Embodiment 3 like Figure 1-16As shown, the present invention proposes an underwater rocket engine test bench with an in-situ calibration mechanism. Compared with the first or second embodiment, the lower ends of the lateral flexibility test assembly 1 51 and the lateral flexibility test assembly 2 52 in this embodiment are respectively provided with a sensor assembly bracket 6 connected to the base 101 and the fixed frame 102; the sensor assembly bracket 6 includes a base plate 601 arranged on the base 101, a mounting plate 602 arranged on the base plate 601, a plurality of adjustment seats 603 respectively arranged on the base 101 and the base plate 601, a plurality of threaded rods 604 corresponding to the adjustment seats 603 and threadedly connected to the adjustment seats 603 and respectively abutting against the base plate 601 and the mounting plate 602, and a fixing bolt 605 arranged on the base plate 601 and the mounting plate 602 and threadedly connected to the base 101 and the base plate 601, respectively. The base plate 601 installed on the fixed frame 102 has a corresponding adjustment seat 603 installed on the fixed frame 102, and the lateral flexibility test component 1 51 is connected to the sensor assembly bracket 6 installed on the base 101, and the lateral flexibility test component 2 52 is connected to the sensor assembly bracket 6 installed on the fixed frame 102, thereby completing the installation of the lateral flexibility test component 1 51.

[0042] Furthermore, the structures of lateral flexible test assembly 1 51 and lateral flexible test assembly 2 52 are the same. Lateral flexible test assembly 1 51 includes a flexible connector 502 arranged on a mounting plate 602, a sensor 2 501 arranged on one end of the flexible connector 502, and a connecting rod 503 with one end arranged on the sensor 2 501 and the other end arranged on the fixed platform 1 401 or the fixed platform 2 403.

[0043] In this embodiment, the adjustment seat 603 installed on the bottom plate 601 supports the threaded rod 604, and the fixing bolt 605 is loosened so that the mounting plate 602 has space to move. Figure 2 , long holes are provided at the connection between the bottom plate 601 and the mounting plate 602 and the fixing bolts 605, so the positions of the bottom plate 601 and the mounting plate 602 can be fine-tuned during installation. The adjustment method is to clamp the wrench at the end of the threaded rod 604, rotate the threaded rod 604, so that the threaded rod 604 on one side is first separated from the mounting plate 602, and then rotate the threaded rod 604 on the other side, so that the threaded rod 604 pushes the mounting plate 602 to move, so that the mounting plate 602 is against the removed threaded rod 604, so that the position of the mounting plate 602 can be adjusted. After the adjustment is completed, the fixing bolts 605 are tightened; the bottom plate 601 installed on the base 101 is installed on the base 101 with the corresponding adjustment seat 603, and the adjustment method is the same; the position of the lateral flexibility test component 1 51 and the lateral flexibility test component 2 52 can be fine-tuned through the sensor assembly bracket 6, which can facilitate the connection of the lateral flexibility test component 1 51 and the lateral flexibility test component 2 52 with the movable frame 4.

[0044] The flexible connector 502 is supported by the mounting plate 602, and the sensor 2 501 supports the sensor 2 501. The sensor 2 501 is connected to the movable frame 4 through the connecting rod 503, so that when the movable frame 4 is displaced, the connecting rod 503 can cooperate with the flexible connector 502 to apply force to the sensor 2 501, so that testing can be carried out; the flexible connector 502 has high axial rigidity and low tangential rigidity, so that during the test, only the axial force will be transmitted to the movable frame 4. If there is a non-axial force, the flexible connector 502 will bend to prevent the force from being transmitted to the movable frame.

[0045] Embodiment 4 like Figure 1-16 As shown, the present invention proposes an underwater rocket engine test bench with an in-situ calibration mechanism. Compared with Example 1, Example 2 or Example 3, in this embodiment, both the lateral sensor calibration component 1 81 and the lateral sensor calibration component 2 82 are provided with a ball and socket connector 7 connected to the moving frame 4; the lateral sensor calibration component 1 81 and the lateral sensor calibration component 2 82 have the same structure. The lateral sensor calibration component 1 81 includes a thrust electric cylinder 2 801 arranged on the fixed frame crossbeam 103, a connecting device 802 arranged on the output end of the thrust electric cylinder 2 801, and a sensor 3 803 arranged on the connecting device 802 and connected to the ball and socket connector 7.

[0046] The two lateral sensor calibration components 81 apply pressure to the fixing platform 1 401 and the fixing platform 2 403 in the vertical direction respectively, so as to calibrate the lateral flexibility test component 51 in the vertical direction, so as to make the monitoring result of the lateral flexibility test component 51 accurate; The two lateral sensor calibration components 82 apply pressure to the fixed platform 1 401 and the fixed platform 2 403 in the horizontal direction respectively, so as to calibrate the lateral flexibility test component 2 52 in the horizontal direction, so as to make the monitoring result of the lateral flexibility test component 2 52 accurate.

[0047] Furthermore, the ball-and-socket connection member 7 comprises a connecting shaft 703 arranged on the sensor three 803, a ball head 704 arranged on the connecting shaft 703, a movable side ball seat 702 slidably connected to the connecting shaft 703, and a connecting rod side ball seat 701 arranged on the movable frame 4 and connected to the movable side ball seat 702; cavities are arranged on the connecting rod side ball seat 701 and the movable side ball seat 702, and the ball head 704 is rotatably arranged in the cavity; the connecting shaft 703 and the movable side ball seat 702 are clearance-matched.

[0048] In this embodiment, when calibrating, the connecting device 802 is pushed to move by the thrust electric cylinder 2 801, and the connecting device 802 applies pressure to the sensor 3 803, and the sensor 3 803 drives the connecting shaft 703 to move, and the connecting shaft 703 drives the ball head 704 to move to the bottom of the cavity in the connecting rod side ball seat 701, and is inserted into the connecting rod side ball seat 701, and pressure is applied to the fixed platform 1 401 or the fixed platform 2 403 through the connecting rod side ball seat 701, so that the value of the pressure direction can be obtained.

[0049] The connecting shaft 703 is pushed by the thrust cylinder 801 to drive the ball head 704 to move to the bottom of the cavity of the movable side ball seat 702, which can pull the movable side ball seat 702 and the connecting rod side ball seat 701, and connect with the fixed platform 1 401 or the fixed platform 2 402 through the connecting rod side ball seat 701, so as to obtain the value of the pulling direction.

[0050] The pressure and tension generated by each sensor are coupled and calculated separately, then substituted into the coupling formula for decoupling and in-situ calibration to ensure the accuracy of the test results.

[0051] After the calibration is completed, the connecting device 802 is retracted by the thrust electric cylinder 801, so that the connecting shaft 703 drives the ball head 704 to move, and the ball head 704 moves to the middle of the cavity between the connecting rod side ball seat 701 and the movable side ball seat 702, so that the ball head 704 and the connecting rod side ball seat 701 are in a relatively separated state, so that during the test, the lateral sensor calibration component 1 81 and the lateral sensor calibration component 2 82 do not contact the movable frame 4, and will not be interfered by the lateral sensor calibration component 1 81 and the lateral sensor calibration component 2 82 during the test, thereby ensuring the accuracy of the test.

[0052] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An underwater rocket engine test bench with an in-situ calibration mechanism, comprising a test frame (1), the test frame (1) comprising a base (101), two sets of fixed frames (102) arranged on the base (101), and fixed frame crossbeams (103) arranged on the two sets of fixed frames (102); characterized in that: Also includes, A support frame (2) arranged on the base (101); A main loading mechanism (3) is arranged on the support frame (2); A movable frame (4) arranged above the base (101); The lateral flexibility test assembly 1 (51) and the lateral flexibility test assembly 2 (52) are both provided in plurality and are respectively arranged on the fixed frame (102) and the fixed frame crossbeam (103) and are connected to the movable frame (4); Two lateral sensor calibration components (1) (81) and two lateral sensor calibration components (2) (82) are provided and are respectively arranged on the fixed frame (102) and the fixed frame crossbeam (103) and connected to the movable frame (4); and A main thrust test assembly (10) is arranged on the support frame (2) and connected to the movable frame (4); the main loading mechanism (3) can abut against the main thrust test assembly (10).

2. The underwater rocket engine test bench with in-situ calibration mechanism according to claim 1, characterized in that: The support frame (2) comprises a first load-bearing pier (201) and a second load-bearing pier (203) which are arranged on the base (101) and have sliding holes, and a support rod (202) arranged between the first load-bearing pier (201) and the second load-bearing pier (203).

3. The underwater rocket engine test bench with in-situ calibration mechanism according to claim 2, characterized in that: The main loading mechanism (3) comprises a thrust electric cylinder 1 (301) arranged on the bearing pier 1 (201), a sensor 1 (304) arranged on the output end of the thrust electric cylinder 1 (301), a connecting rod cross beam 1 (302) arranged on the sensor 1 (304), two push rods (303) both arranged on the connecting rod cross beam 1 (302) and sliding through the sliding hole, and a connecting rod cross beam 2 (305) arranged on the push rod (303).

4. The underwater rocket engine test bench with in-situ calibration mechanism according to claim 3, characterized in that: The movable frame (4) comprises a fixed platform (401) arranged above the base (101) and connected to the lateral flexibility test assembly (51), the lateral flexibility test assembly (52), the lateral sensor calibration assembly (81) and the lateral sensor calibration assembly (82), a connecting frame (402) arranged on the fixed platform (401), and a fixed platform (403) arranged on the connecting frame (402), and a transmission rod (404) arranged on the fixed platform (403) and slidably connected to the connecting rod crossbeam (305) and connected to the main thrust test assembly (10).

5. The underwater rocket engine test bench with in-situ calibration mechanism according to claim 4, characterized in that: The main thrust test assembly (10) comprises a second support rod (1002) arranged on the second bearing pier (203), a fourth sensor (1001) arranged on the second support rod (1002), and a push sleeve (1003) arranged on the transmission rod (404); a through groove (3051) and a crimping platform (3052) are arranged on the second connecting rod cross beam (305); the transmission rod (404) and the through groove (3051) are clearance-matched; one end of the push sleeve (1003) is embedded in the crimping platform (3052) and can abut against the second connecting rod cross beam (305).

6. The underwater rocket engine test bench with in-situ calibration mechanism according to claim 5, characterized in that: The lower ends of the lateral flexibility test assembly 1 (51) and the lateral flexibility test assembly 2 (52) are respectively provided with sensor assembly brackets (6) connected to the base (101) and the fixed frame (102); the sensor assembly bracket (6) comprises a bottom plate (601) arranged on the base (101), a mounting plate (602) arranged on the bottom plate (601), a plurality of adjustment seats (603) respectively arranged on the base (101) and the bottom plate (601), a plurality of threaded rods (604) corresponding to the adjustment seats (603) and threadedly connected to the adjustment seats (603) and respectively abutting against the bottom plate (601) and the mounting plate (602), and fixing bolts (605) arranged on the bottom plate (601) and the mounting plate (602) and threadedly connected to the base (101) and the bottom plate (601) respectively.

7. The underwater rocket engine test bench with in-situ calibration mechanism according to claim 6, characterized in that: The lateral flexibility test assembly 1 (51) and the lateral flexibility test assembly 2 (52) have the same structure. The lateral flexibility test assembly 1 (51) comprises a flexible connector (502) arranged on the mounting plate (602), a sensor 2 (501) arranged on one end of the flexible connector (502), and a connecting rod (503) having one end arranged on the sensor 2 (501) and the other end arranged on the fixing platform 1 (401) or the fixing platform 2 (403).

8. The underwater rocket engine test bench with in-situ calibration mechanism according to claim 7, characterized in that: The lateral sensor calibration component 1 (81) and the lateral sensor calibration component 2 (82) are both provided with a ball-and-socket connection piece (7) connected to the movable frame (4); the lateral sensor calibration component 1 (81) and the lateral sensor calibration component 2 (82) have the same structure, and the lateral sensor calibration component 1 (81) comprises a thrust electric cylinder 2 (801) arranged on the fixed frame crossbeam (103), a connection device (802) arranged on the output end of the thrust electric cylinder 2 (801), and a sensor 3 (803) arranged on the connection device (802) and connected to the ball-and-socket connection piece (7).

9. The underwater rocket engine test bench with in-situ calibration mechanism according to claim 8, characterized in that: The ball-and-socket connection member (7) comprises a connection shaft (703) arranged on the sensor three (803), a ball head (704) arranged on the connection shaft (703), a movable side ball seat (702) slidably connected to the connection shaft (703), and a connecting rod side ball seat (701) arranged on the movable frame (4) and connected to the movable side ball seat (702); cavities are arranged on the connecting rod side ball seat (701) and the movable side ball seat (702), and the ball head (704) can move in the cavity after being assembled; the connection shaft (703) and the movable side ball seat (702) are clearance-matched.

10. The underwater rocket engine test bench with in-situ calibration mechanism according to claim 9, characterized in that: The second load-bearing pier (203) is provided with a bull's eye ball centering assembly (9); the bull's eye ball centering assembly (9) is provided with a plurality of bull's eye ball centering assemblies (9) and respectively located at the two sliding holes; the bull's eye ball centering assembly (9) comprises a load-bearing pier (901) provided on the second load-bearing pier (203), an adjustment bolt (904) provided on the load-bearing pier (901) and threadedly connected, a support head (902) provided on the adjustment bolt (904), and a ball (903) rotatably provided in the support head (902) and slidably connected to the push rod (303).

Images