Movable double-shaft control device and thermal modal test system

Abstract

The invention discloses a movable double-shaft control device and a thermal modal test system. The movable double-shaft control device comprises a hanging frame which is horizontally arranged in a suspended mode. The bottom face of the hanging frame is connected with the top face of a guide rail body of a first lead screw linear guide rail which is transversely distributed. A first sliding block capable of transversely sliding left and right is arranged on the lower portion of a guide rail body of the first lead screw linear guide rail. The bottom surface of the first sliding block is connected with the top surface of a guide rail body of a second lead screw linear guide rail which is longitudinally distributed; a second sliding block capable of longitudinally sliding back and forth is arranged at the lower part of a guide rail body of the second lead screw linear guide rail; the second sliding block is fixedly connected with the top of the laser vibration meter mounting frame; and a laser vibration meter is arranged on the laser vibration meter mounting rack. Through the movable double-shaft system, the laser vibration meter can be safely, reliably and efficiently moved, the laser vibration meter is controlled to dynamically move to a plurality of modal parameter response measuring points on the test piece, then the modal test of the test piece in a high-temperature environment is completed, and great practical significance is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal modal testing in aerospace structure testing, and particularly relates to a movable two-axis control device and a thermal modal test system. BACKGROUND

[0002] With the development of hypersonic vehicles, the vehicle structure will be subjected to an extreme high-temperature environment of more than 1400 DEG C when flying at high speed. The structural characteristics of the vehicle show significant temperature dependence. Excessive temperature may cause the structural modal parameters to change, thereby affecting the safety and reliability of the entire system.

[0003] How to accurately obtain the structural characteristics of the vehicle at high temperature has become a key problem to be solved in aerospace engineering. Obtaining the structural modal parameters (such as natural frequency, mode shape and damping ratio) of the vehicle at high temperature is a core means for evaluating the risk of thermal vibration coupling failure.

[0004] However, the existing thermal modal test technology faces technical bottlenecks:

[0005] First, the measurement method is limited. In the extreme high-temperature environment (1400 DEG C), the contact sensor cannot work. The traditional red laser displacement sensor uses a red laser with a wavelength of 650 nm. The tested piece spontaneously radiates at high temperature, completely covering the test signal, and the signal-to-noise ratio decreases to below -20 dB, so that the test signal cannot be obtained. Therefore, a laser vibration meter based on Doppler interference technology is needed to obtain the structural modal parameters (such as natural frequency, mode shape and damping ratio) of the tested piece at high temperature.

[0006] For the laser vibration meter, in order to realize the measurement of the structural modal parameters of the tested piece, the position of the laser vibration meter probe needs to be adjusted outside the high-temperature environment. The existing adjustment scheme of the position of the laser vibration meter probe is a manual adjustment scheme. The adjustment speed is slow, and the time consumed by a single manual adjustment and positioning is long (for example, more than 3 minutes). Since the tested piece will be oxidized and thickened (> 50 microns) and material creep will occur within 10 minutes when the test temperature reaches 1400 DEG C, the modal drift of the tested piece will be more than 2 Hz, which seriously affects the accuracy of the test.

[0007] Secondly, the spatial interference problem: the size of the optical probe of the laser vibration meter is generally greater than 130 mm, and the effective test area of the typical vehicle panel test piece is only 500*500 mm. When the distance between the measuring points is 100 mm, the multi-probe arrangement will cause physical interference.

[0008] Third, there is the issue of high hardware costs: At present, the commonly used German Polytec laser vibrometer costs as much as 500,000 to 800,000 yuan per unit. A typical modal test of an aircraft panel test piece requires 10 to 50 modal parameter response measurement points. If multiple laser vibrometers are used for parallel measurement, the hardware cost will exceed 10 million yuan, far exceeding the affordability of most testing units.

[0009] Therefore, there is an urgent need to develop a technology that can solve the above technical problems. Summary of the Invention

[0010] The purpose of the present invention is to provide a movable dual-axis control device and a thermal modal test system in view of the technical defects in the prior art.

[0011] To this end, the present invention provides a movable dual-axis control device, which includes a hanging bracket arranged horizontally in the air;

[0012] The bottom surface of the bracket is connected to the top surface of the guide rail body of the first lead screw linear guide rail distributed laterally;

[0013] The lower part of the guide rail body of the first lead screw linear guide rail is provided with a first sliding block capable of sliding horizontally left and right;

[0014] The bottom surface of the first slider is connected to the top surface of the guide rail body of the longitudinally distributed second lead screw linear guide rail;

[0015] The lower part of the guide rail body of the second lead screw linear guide rail is provided with a second sliding block which can slide longitudinally forward and backward;

[0016] Second slider - fixedly connected to the top of the laser vibrometer mounting frame;

[0017] A laser vibrometer is arranged on the laser vibrometer mounting frame.

[0018] In addition, the present invention also provides a thermal modal testing system, which includes the movable biaxial control device as described above, and a laser vibrometer;

[0019] The laser vibrometer is arranged on the laser vibrometer bracket of the movable dual-axis control device.

[0020] As can be seen from the technical solutions provided above, compared with the prior art, the present invention provides a movable dual-axis control device and thermal modal testing system. These scientifically designed systems enable safe, reliable, and efficient movement of a laser vibrometer (specifically, a single-point laser vibrometer) through the movable dual-axis system. This system allows the laser vibrometer to be dynamically moved to multiple modal parameter response measurement points (i.e., the response points for modal measurement, also called modal parameter response points) on the test piece, thereby completing modal testing of the test piece in a high-temperature environment. This system has significant practical significance.

[0021] The modal test system of the present application is a high-temperature modal test system which is convenient to use, has universality and is low in cost.

[0022] The thermal modal test system provided by the present application is a thermal modal test system suitable for the super-high-temperature environment of a high-speed aircraft, and is beneficial to meet the measurement requirement of the modal characteristics of a thermal protection structure of a high-Mach aircraft under extreme aerodynamic thermal load conditions. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a front view of a movable dual-shaft control device provided by the present application when a laser vibration tester is installed thereon;

[0024] Figure 2 is a bottom view of the movable dual-shaft control device provided by the present application when the laser vibration tester is installed thereon;

[0025] Figure 3 is a working principle diagram of one embodiment of the thermal modal test system provided by the present application;

[0026] Figure 4 is a distribution diagram of modal parameter response points (i.e. thermal modal test response measuring points) of a test piece in one embodiment of the thermal modal test system provided by the present application;

[0027] In the figure, 1 is a hanger, 2 is a first screw rod linear guide rail (i.e. an X-axis guide rail), 3 is a second screw rod linear guide rail (i.e. a Y-axis guide rail), 4-1 is a first sliding block, and 4-2 is a second sliding block;

[0028] 5-1 is a first servo motor, and 5-2 is a second servo motor;

[0029] 6-1 is a first photoelectric sensing switch, and 6-2 is a second photoelectric sensing switch;

[0030] 7 is a laser vibration tester mounting rack, 8 is a laser vibration tester, 9 is a test piece, 10 is a fixed mounting hole, and 11 is a modal parameter response point. DETAILED DESCRIPTION

[0031] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of the present application.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0033] In the description of the present application, it should be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "setting" should be understood broadly, for example, it can be fixedly connected, set, or detachably connected, set, or integrally connected, set. For those of ordinary skill in the art, the specific meaning of the above terms in the present patent can be understood according to the specific circumstances.

[0034] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0035] Referring to Figures 1 to 4 The present application provides a movable dual-axis control device, comprising a hanging rack 1 arranged horizontally and suspended;

[0036] The bottom surface of the hanging rack 1 is connected to the top surface of the guide body of the first screw linear guide rail (i.e. X-axis guide rail) 2 distributed transversely;

[0037] The lower part of the guide body (i.e. X-axis profile) of the first screw linear guide rail 2 has a first slider 4-1 that can slide transversely left and right;

[0038] The bottom surface of the first slider 4-1 is connected to the top surface of the guide body of the second screw linear guide rail (i.e. Y-axis guide rail) 3 distributed longitudinally;

[0039] The lower part of the guide rail body (i.e., the Y-axis profile) of the second lead screw linear guide rail 3 has a second slider 4-2 that can slide longitudinally back and forth;

[0040] The second slider 4-2 is fixedly connected to the top of the laser vibrometer mounting bracket 7;

[0041] A laser vibrometer 8 is mounted on the laser vibrometer mounting frame 7 .

[0042] In the present invention, in a specific implementation, the top of the rack 1 is provided with a plurality of evenly distributed mounting holes;

[0043] The bracket 1 is connected to the test bench located outside by screws.

[0044] It should be noted that, in the present invention, the surface of the hanger 1 has evenly distributed mounting holes, and can be combined and installed with any test bench, thus having universality.

[0045] In the present invention, in a specific implementation, a first servo motor 5-1 is provided at the right end of the first screw linear guide rail 2;

[0046] The power output end (i.e., the power output shaft) on the left side of the first servo motor 5-1 is linked to one end of the lead screw in the first lead screw linear guide 2 to drive the lead screw to rotate (specifically, the linkage connection can be achieved through common means such as gears or couplings, which are common existing connection methods and will not be described in detail here);

[0047] A first slider 4 - 1 is provided on the screw in the first screw linear guide rail 2 .

[0048] It should be noted that, driven by the first servo motor 5 - 1 , the first slider 4 - 1 can be moved horizontally left and right on the lead screw of the first lead screw linear guide 2 (ie, move along the X-axis direction).

[0049] In the present invention, in a specific implementation, a second servo motor 5-2 is provided at the front end portion of the second lead screw linear guide rail 3;

[0050] The power output end (i.e., the power output shaft) of the second servo motor 5-2 is linked to one end of the screw in the second screw linear guide 3 to drive the screw to rotate (specifically, they can be linked by common means such as gears or couplings, which are common existing connection methods and will not be described in detail here);

[0051] A second slider 4 - 1 is provided on the screw in the second screw linear guide 3 .

[0052] It should be noted that, driven by the second servo motor 5 - 2 , the second slider 4 - 2 can move longitudinally forward and backward on the screw of the second screw linear guide 3 (ie, move along the Y-axis direction).

[0053] In a specific implementation, the first servo motor 5-1 and the second servo motor 5-2 are both AC servo motors.

[0054] It should be noted that the first slider and the first servo motor, and the second slider and the second servo motor are connected through a transmission mechanism, which can include a gear and a lead screw. According to the number of pulses required for one-way rotation of the motor and the distance parameter of the slider moving in one-way rotation of the motor, the high-precision movement of the slider can be controlled through an electronic pulse signal.

[0055] It should be noted that the first lead screw linear guide rail (i.e., the X-axis guide rail) 2 and the second lead screw linear guide rail (i.e., the Y-axis guide rail) 3 are both mature and well-known ball screw linear guide rails in the prior art, and will not be described here.

[0056] In the present application, the central axis of the first lead screw linear guide rail (i.e., the X-axis guide rail) 2 and the central axis of the second lead screw linear guide rail (i.e., the Y-axis guide rail) 3 are perpendicular to each other in the horizontal plane.

[0057] For the present application, the first lead screw linear guide rail 2 and the second lead screw linear guide rail 3 are cross-orthogonal mounted, which can move to any point in the two coordinates, thereby realizing linear, rectangular, and circular movement.

[0058] In the present application, a plurality of threaded holes are distributed on the laser vibration meter mounting rack 7 for fixing the laser vibration meter 8.

[0059] It should be noted that for the present application, the laser vibration meter 8 is mounted on the laser vibration meter support 7, so that the laser vibration meter can realize linear motion, rectangular motion, etc.

[0060] It should be noted that for the present application, the first lead screw linear guide rail 2 and the second lead screw linear guide rail 3 form a basic motion frame through the first slider 4-1, which can provide movement of any coordinate point in the two axes. The sliders on the first lead screw linear guide rail 2 and the second lead screw linear guide rail 3 are connected to the corresponding servo motors through a transmission mechanism (such as a lead screw), which can complete high-precision movement on the X-axis profile of the first lead screw linear guide rail 2 and the Y-axis profile of the second lead screw linear guide rail 3, respectively.

[0061] In the present application, a first photoelectric sensing switch 6-1 is arranged on the bottom surface of the guide rail body of the first lead screw linear guide rail 2.

[0062] The first photoelectric sensing switch 6-1 is used to detect the specific position of the first slider 4-1 on the first lead screw linear guide rail 2.

[0063] A second photoelectric sensing switch 6-2 is arranged on the bottom surface of the guide rail body of the second lead screw linear guide rail 3.

[0064] The second photoelectric sensing switch 6-2 is used for detecting the specific position of the second sliding block 4-2 on the second lead screw linear guide rail 3.

[0065] It should be noted that, for the present application, the two photoelectric sensing switches, the first photoelectric sensing switch 6-1 and the second photoelectric sensing switch 6-2, are photoelectric calibration switches arranged on the guide rail body of the first lead screw linear guide rail 2 (i.e. the X-axis profile) and the guide rail body of the second lead screw linear guide rail 3 (i.e. the Y-axis profile), which can feed back the position of the sliding block in real time and further correct the position deviation. The position is corrected in combination with the position of the transmission mechanism (such as the lead screw), and the positioning accuracy can still be maintained when moving quickly.

[0066] In a specific implementation, the two photoelectric sensing switches, the first photoelectric sensing switch 6-1 and the second photoelectric sensing switch 6-2, are located at the mechanical zero position, and each time the device is turned on, the photoelectric sensing switch can feed back the position of the sliding block to the motion control system for calibrating the position coordinates of the corresponding sliding block.

[0067] Therefore, for the present application, the mechanical positions of the two sliding blocks can be fed back by the two photoelectric sensing switches, and the accuracy of each test point (i.e. the modal parameter response measurement point to be moved to) is ensured through real-time adjustment.

[0068] In the present application, in a specific implementation, the movable dual-shaft control device further comprises a motion control system;

[0069] The motion control system comprises a motion control chip;

[0070] The motion control chip is connected with the first photoelectric sensing switch 6-1, the second photoelectric sensing switch 6-2, and the control ends of the first servo motor 5-1 and the second servo motor 5-2, respectively, for acquiring the specific positions of the first sliding block 4-1 on the first lead screw linear guide rail 2 and the second sliding block 4-2 on the second lead screw linear guide rail 3 in real time through the first photoelectric sensing switch 6-1 and the second photoelectric sensing switch 6-2, and sending a control signal to control the first servo motor 5-1 and the second servo motor 5-2 to operate, so that the first sliding block 4-1 moves horizontally left and right (i.e. moves along the X-axis direction) on the lead screw of the first lead screw linear guide rail 2 under the drive of the first servo motor 5-1, and the second sliding block 4-2 moves vertically forward and backward (i.e. moves along the Y-axis direction) on the lead screw of the second lead screw linear guide rail 3 under the drive of the second servo motor 5-2, until the moving position of the second sliding block 4-2 reaches the pre-required test position (such as the modal parameter response measurement point, i.e. the response point of modal measurement).

[0071] It should be noted that the coordinates of the pre-required test position include the horizontal coordinate and the vertical coordinate, wherein the horizontal coordinate can be determined by the first photoelectric sensing switch 6-1, and the vertical coordinate can be determined by the second photoelectric sensing switch 6-2.

[0072] In a specific implementation, the motion control chip can be a programmable controller PLC, a central processing unit CPU, a digital signal processor DSP, or a single-chip microcomputer MCU.

[0073] It should be noted that for the present application, the motion control system can have both automatic and manual modes, and by moving the two sliders on the guide body of the first lead screw linear guide rail 2 (i.e., the X-axis profile) and the guide body of the second lead screw linear guide rail 3 (i.e., the Y-axis profile), the laser vibration meter 8 can be quickly and accurately positioned to the response point coordinates of modal measurement, and modal measurement under an ultra-high temperature (1400℃) environment can be completed. The motion control system includes a liquid crystal display, a motion control chip, etc., and the minimum data unit is 0.001mm, and the fastest motion limit speed is ±9000mm / min.

[0074] Based on the above-mentioned movable dual-axis control device of the present application, referring to Figure 3 、 Figure 4 The present application also provides a thermal modal test system, which includes the movable dual-axis control device as described above, and a laser vibration meter 8.

[0075] The laser vibration meter 8 is arranged on the laser vibration meter support 7 of the movable dual-axis control device.

[0076] The laser vibration meter 8 is used to measure the structural modal parameters (such as including natural frequency, mode shape, and damping ratio) of a plurality of modal parameter response points on the test piece 9.

[0077] In a specific implementation, the laser vibration meter 8 and the movable dual-axis control device are used to form a modal response test system in the thermal modal test system of the present application. The laser vibration meter 8 can specifically use a laser vibration meter of polytec, Germany.

[0078] In a specific implementation, the thermal modal test system of the present application further includes a vibration excitation system.

[0079] The vibration excitation system includes a vibration table and a power amplifier.

[0080] The test piece 9 is arranged on the table surface of the vibration table.

[0081] The vibration table is used to simulate a vibration environment for the test piece 9.

[0082] It should be noted that the vibration table is also connected with a power amplifier, and the power amplifier is used to drive the electromagnetic vibration table to generate vibration, which is a conventional technology, and will not be described here again. The excitation system adopts an electric vibration table, and a closed-loop control mode is used for excitation.

[0083] In a specific implementation, the thermal modal test system further comprises a heating system.

[0084] The heating system comprises a sealed test chamber and a plurality of quartz lamps located in the test chamber.

[0085] The test piece 9 is located in the test chamber.

[0086] The quartz lamps are used to apply a thermal load to the test piece 9.

[0087] It should be noted that the heating system simulates and provides a thermal load to the test piece 9 through the radiation heating of the quartz lamps.

[0088] In a specific implementation, the thermal modal test system further comprises a modal analysis system.

[0089] The modal analysis system is connected with the laser vibration meter 8, and is used to collect the acceleration response signal output by the laser vibration meter 8, and then analyze and obtain the structural modal parameters (for example, including natural frequency, mode shape and damping ratio) of the test piece 9 (for example, the wall panel of the aircraft) at high temperature.

[0090] It should be noted that for the present application, the modal analysis system is a signal processing system known in the art and mature in technology, for example, a Siemens simcenter testlab SCM2E05 acquisition and analysis system can be used.

[0091] It should be noted that for the present application, for the test piece 9, a vibration table is used to apply a basic excitation, a quartz lamp is used to apply a thermal load, and a laser vibration meter 8 is combined with a movable two-axis control device to sequentially measure the acceleration response signals of the pre-required modal parameter response points (for example, 25 modal parameter response points) on the structure of the test piece 9 through the laser vibration meter 8, as shown in Figure 4 Then, the transfer function at high temperature is calculated according to the existing modal analysis system, and the structural modal parameters of the test piece 9 (for example, the wall panel of the aircraft) at high temperature are analyzed.

[0092] In order to more clearly understand the technical solutions of the present application, the key role of the present application in thermal modal test will be described below in combination with specific embodiments.

[0093] Embodiment

[0094] The test piece 9 is a certain composite material wall panel, and the purpose of the high-temperature modal test is to obtain typical structural modal parameters in a thermal environment and to carry out ground thermal modal test.

[0095] Embodiment: see Figure 3 The thermal modal test system comprises a vibration excitation system, a heating system, a modal response test system and a modal analysis system. The vibration excitation system comprises a vibration table, a laser vibration meter and a movable double-axis control device. The vibration table is used to apply a basic excitation. The heating system comprises a quartz lamp. The quartz lamp is used to apply a thermal load. The laser vibration meter is combined with the movable double-axis control device. The laser vibration meter 8 is used to sequentially measure acceleration response signals of 25 modal parameter response points on the structure of the test piece 9. See Figure 4 Then, a transfer function in a high-temperature state is calculated according to the existing modal analysis system, and then the structural modal parameters in the high-temperature state are analyzed.

[0096] In the specific implementation, the thermal modal test system provided by the application comprises the following specific implementation steps:

[0097] In the first step, coordinates of the 25 modal parameter response points 11 on the test piece 9, for example, (0, 0), (0, 10), and the like, are determined before the test starts, and are sequentially input into the movable double-axis control device (specifically, a motion control system therein).

[0098] In the second step, the test piece 9 is rigidly fixed on the vibration table through an existing clamp.

[0099] In the third step, the heating system comprising the quartz lamp increases the temperature of the test piece 9 to a target temperature of 1400℃ at a rate of 3℃ / s.

[0100] In the fourth step, when the temperature of the test piece 9 is stabilized at the target temperature, the vibration table excitation is started.

[0101] In the fifth step, the laser vibration meter 8 is turned on.

[0102] In the sixth step, the movable double-axis control device is started, and the time-domain response signals (that is, the acceleration response signals) of the 25 modal parameter response points 11 are sequentially measured according to the previously input coordinates. The collection time of a single test point needs 3s.

[0103] In the seventh step, the laser vibration meter 8 is quickly moved by the movable double-axis control device, and the signal collection on all test points (that is, the 25 modal parameter response points 11) can be completed within 2min.

[0104] In the eighth step, the modal analysis system analyzes the collected time-domain response signals (that is, the acceleration response signals), and obtains the structural modal parameters of the test piece 9 (for example, the wall plate of the aircraft) in the high-temperature state, and the thermal modal test is completed.

[0105] In the specific implementation, a plurality of fixed mounting holes 10 are further arranged around the periphery of the test piece 9. Screws pass through the fixed mounting holes 10 and are connected with external mounting equipment (for example, the fuselage of the aircraft).

[0106] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as falling within the protection scope of the present application.

Claims

1. A movable biaxial control device, characterized in that: It comprises a hanging rack (1) arranged horizontally in the air; The bottom surface of the hanging bracket (1) is connected to the top surface of the guide rail body of the first screw linear guide rail (2) distributed laterally; The lower part of the guide rail body of the first lead screw linear guide rail (2) is provided with a first sliding block (4-1) capable of sliding horizontally left and right; The bottom surface of the first sliding block (4-1) is connected to the top surface of the guide rail body of the second lead screw linear guide rail (3) distributed longitudinally; The lower part of the guide rail body of the second lead screw linear guide rail (3) is provided with a second sliding block (4-2) which can slide longitudinally forward and backward; The second sliding block (4-2) is fixedly connected to the top of the laser vibrometer mounting frame (7); A laser vibrometer (8) is provided on the laser vibrometer mounting frame (7).

2. The movable biaxial control device according to claim 1, characterized in that: The top of the hanger (1) is provided with a plurality of evenly distributed mounting holes; The hanger (1) is connected to the test bench located outside by screws.

3. The movable biaxial control device according to claim 1, characterized in that: A first servo motor (5-1) is provided at the right end of the first lead screw linear guide rail (2); The power output end on the left side of the first servo motor (5-1) is linked to one end of the lead screw in the first lead screw linear guide rail (2); A first sliding block (4-1) is provided on the lead screw in the first lead screw linear guide rail (2).

4. The movable biaxial control device according to claim 1, wherein: A second servo motor (5-2) is provided at the front end portion of the second lead screw linear guide rail (3); The power output end of the second servo motor (5-2) is linked to one end of the lead screw in the second lead screw linear guide rail (3) to drive the lead screw to rotate; A second sliding block (4-1) is provided on the lead screw in the second lead screw linear guide rail (3).

5. The movable biaxial control device according to claim 1, wherein: The projections of the central axis of the first lead screw linear guide rail (2) and the central axis of the second lead screw linear guide rail (3) on the horizontal plane intersect vertically.

6. The movable biaxial control device according to claim 1, wherein: A first photoelectric sensor switch (6-1) is provided on the bottom surface of the guide rail body of the first lead screw linear guide rail (2); A first photoelectric sensor switch (6-1) is used to detect the specific position of the first slider (4-1) on the first lead screw linear guide rail (2); A second photoelectric sensor switch (6-2) is provided on the bottom surface of the guide rail body of the second lead screw linear guide rail (3); The second photoelectric induction switch (6-2) is used to detect the specific position of the second slider (4-2) on the second lead screw linear guide rail (3).

7. The movable biaxial control device according to claim 1, wherein: Also includes motion control systems; Motion control systems, including motion control chips; The motion control chip is respectively connected to the first photoelectric sensing switch (6-1), the second photoelectric sensing switch (6-2) and the control ends of the first servo motor (5-1) and the second servo motor (5-2), and is used for obtaining the specific position of the first slider (4-1) on the first lead screw linear guide rail (2) and the specific position of the second slider (4-2) on the second lead screw linear guide rail (3) in real time through the first photoelectric sensing switch (6-1) and the second photoelectric sensing switch (6-2), and sending a control signal to control the operation of the first servo motor (5-1) and the second servo motor (5-2), so that under the drive of the first servo motor (5-1), the first slider (4-1) moves horizontally left and right on the lead screw of the first lead screw linear guide rail (2), and under the drive of the second servo motor (5-2), the second slider (4-2) moves longitudinally forward and backward on the lead screw of the second lead screw linear guide rail (3), until the movement position of the second slider (4-2) reaches a pre-required test position.

8. A thermal modal testing system, characterized in that: comprising a movable two-axis control device as claimed in any one of claims 1 to 7, and a laser vibrometer (8); A laser vibrometer (8) is arranged on the laser vibrometer bracket (7) of the movable biaxial control device.

9. The thermal modal testing system according to claim 8, wherein: It also includes a vibration system and a heating system; Among them, the excitation system includes a vibration table and a power amplifier; A test piece (9) is arranged on the table of the vibration table; a vibration table for providing a vibration environment for simulating the test piece (9); The heating system includes a sealed test chamber and a plurality of quartz lamps located in the test chamber; The test piece (9) is located in the test chamber; A quartz lamp is used to apply a thermal load to the test piece (9).

10. The thermal modal testing system according to claim 9, wherein: Also included is a modal analysis system; The modal analysis system is connected to the laser vibrometer (8) and is used to collect the acceleration response signal output by the laser vibrometer (8), and then analyze and obtain the structural modal parameters of the test piece (9) at high temperature.

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