Quantitative test modal device and control method thereof

Abstract

The invention provides a quantitative test modal device and a control method thereof, and relates to the technical field of modal analysis, the device comprises a main control module, a high-precision exciting force control module, a micron-order position control module and an integral supporting structure, the main control module is connected with the high-precision exciting force control module and the micron-order position control module; the overall supporting structure comprises a test platform, the micron-order position control module comprises an electric sliding table fixed to the test platform, and the main control module is connected with the electric sliding table and used for outputting pulse signals with the controllable number and phase to control the electric sliding table to move in the axial direction. The high-precision exciting force control module comprises an intelligent power hammer fixed to the electric sliding table, and the intelligent power hammer is in control connection with the main control module and used for quantitatively outputting exciting force according to the knocking control instruction output by the main control module. Quantitative excitation force and excitation positions are provided for test modal analysis of the related test piece of the rotating machine, and quantitative test modal analysis of the related test piece of the rotating machine is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of modal analysis, and in particular to a quantitative test modal device and a control method thereof. Background Art

[0002] Modal analysis is an extremely important analysis method in mechanical and structural dynamics. The basic idea of ​​modal analysis is to decouple the matrix equations that describe the dynamic performance of machinery and structures, so that the dynamic characteristics of N-degree-of-freedom systems can be expressed by single-degree-of-freedom systems. The core content of modal analysis is to determine the modal parameters such as natural frequency, damping ratio and vibration mode used to describe the dynamic characteristics of structural systems. The so-called experimental modal analysis is a dynamic test analysis technology that determines the modal parameters of mechanical and structural systems by exciting machinery and structures, as well as vibration measurement, signal analysis, frequency response estimation and modal parameter identification.

[0003] In the research of rotating machinery structure and performance optimization, experimental modal analysis is an effective means to evaluate the vibration characteristics of related specimens. In the early research stage, experimental modal analysis played a huge role in the industrial application of rotating machinery, material selection, performance evaluation, process stability evaluation and vibration performance comparison. Entering the current research stage, the structure of related specimens has undergone major changes, and their vibration characteristics need to be paid more attention. In addition, the critical frequency of new related specimens of rotating machinery is lower, requiring higher accuracy and better repeatability of modal tests, which puts higher requirements on modal test technology. Therefore, it is necessary to carry out the development of quantitative test modal devices, and provide a test modal device that can quantify the excitation force and accurately locate the excitation position, so as to provide more reliable data support for the vibration performance analysis of related specimens of rotating machinery. Summary of the invention

[0004] In view of this, an embodiment of the present application provides a quantitative test modal device and a control method thereof, which are used to provide a quantitative excitation force and an excitation position for the test modal analysis of rotating machinery related specimens, thereby realizing the quantitative test modal analysis of rotating machinery related specimens.

[0005] The embodiment of the present application provides the following technical solution: a quantitative test modal device, comprising: a main control module, a high-precision excitation force control module, a micron-level position control module and an overall support structure, wherein the main control module is controlled and connected with the high-precision excitation force control module and the micron-level position control module respectively, and the main control module, the high-precision excitation force control module and the micron-level position control module are all arranged on the overall support structure;

[0006] The integral support structure includes a test platform, the micrometer-level position control module includes an electric slide fixed on the test platform, and the main control module is control-connected with the electric slide to output a pulse signal with controllable quantity and phase to control the electric slide to perform micrometer-level movement in the axial direction;

[0007] The high-precision excitation force control module includes an intelligent hammer, which is fixedly arranged on the electric slide. The intelligent hammer is control-connected to the main control module and is used to quantitatively output the excitation force according to the knocking control instruction output by the main control module.

[0008] According to one embodiment of the present application, the electric slide includes a lifting platform and an electric slide rod, the lifting platform is fixed on the test platform, the lifting drive end of the lifting platform is connected to the electric slide rod, and is used to control the electric slide rod to perform micron-level movement in the axial direction according to the control instructions output by the main control module; the intelligent force hammer is fixed on the electric slide rod.

[0009] According to one embodiment of the present application, the micron-level position control module also includes a grating ruler, which is control-connected to the main control module. The grating ruler is arranged on the electric slide rod and is used to provide real-time feedback of the moving position and direction information of the electric slide rod to the main control module, so as to feedback control the micron-level displacement movement of the electric slide rod.

[0010] According to one embodiment of the present application, photoelectric switches are respectively installed at both ends of the electric slide bar, and the photoelectric switches are connected to the main control module to indicate the upper and lower limits of the electric slide bar's stroke, so as to control the micron-level displacement movement of the electric slide bar through feedback from the main control module.

[0011] According to one embodiment of the present application, it also includes a human-computer interaction module, which is controlled and connected to the main control module. The human-computer interaction module includes a button and an emergency stop button, and is used to detect the electrical signals of the button and the emergency stop button in real time through the main control module to execute the corresponding operation of the button; the human-computer interaction module also includes a touch screen and an alarm light. The main control module exchanges data with the touch screen through the RS485 industrial communication bus, receives parameter settings and control instructions from the touch screen, and displays the working status and parameters of the device in real time; the alarm light is used to make an audible and visual alarm according to the control instructions of the main control module.

[0012] According to one embodiment of the present application, the main control module includes a CPU module and a DIO module, and the CPU module and the DIO module are bidirectionally connected. The CPU module is used for programming to implement the test modal automatic control strategy, as well as the input instruction execution and real-time status display of the device of the human-computer interaction module, and the servo drive of the electric slide and the striking control of the intelligent hammer are realized through the DIO module.

[0013] According to an embodiment of the present application, it also includes a reinforcing rib, one end of which is fixed to the electric sliding rod, and the other end of which is fixed to the test platform to stabilize the electric sliding rod.

[0014] According to an embodiment of the present application, it also includes an electric control box, in which the human-computer interaction module and the main control module are installed.

[0015] According to an embodiment of the present application, the integral supporting structure further includes a bracket and a movable foot, the test platform is fixed on the bracket, and the movable foot is arranged at the bottom of the bracket.

[0016] The present application also provides a control method for the quantitative test modal device as described above, comprising:

[0017] S1: Initializing the quantitative test modal device, completing program self-check and startup;

[0018] S2: Performing test modal analysis parameter configuration, wherein the parameters include the excitation point division method, excitation force magnitude, and excitation times of the test piece at different axial heights;

[0019] S3: Determine the execution mode, which includes a manual mode and an automatic mode; if the manual mode is entered, the software process enters the process of S4; if the automatic mode is entered, the software process enters the process of S5;

[0020] S4: In manual mode, set the electric running speed of the electric slide and the step length during single-step operation; perform manual jog operation or single-step operation upward or downward;

[0021] S5: In the automatic mode, according to the detection interval in the test modal analysis parameter configuration, the intelligent hammer is driven to perform interval excitation, the excitation state fed back by the intelligent hammer is recorded, the number of effective detection intervals is determined, and then the effective detection intervals are matched with the preset multiple axial heights of the test piece to obtain the final axial height of the test piece;

[0022] S6: After the axial height of the test piece is obtained, the excitation points are divided according to the number of excitation points and excitation position requirements of the test piece and the requirements of the modal test to obtain all specific excitation points;

[0023] S7: Traverse and strike all specific excitation points on the axis of the test piece.

[0024] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above-mentioned technical solutions adopted in the embodiments of this specification include at least the following: The embodiments of the present invention provide a test modal device that can provide quantitative excitation force and excitation position for test modal analysis of rotating machinery-related specimens. It adopts a test modal-specific automatic control strategy, and cooperates with a dedicated self-developed main control unit to achieve quantitative output of excitation force, automatic axial excitation position division and high-precision positioning of the axial excitation position. It is equipped with a friendly human-computer interaction system, and can provide a quantitative solution for test modal analysis, thereby providing more reliable and comprehensive data support and analysis basis for the vibration performance analysis of rotating machinery-related accessories. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is an overall schematic diagram of a special quantitative test modal device according to an embodiment of the present invention;

[0027] Figure 2 It is a first schematic diagram of the overall structure of a dedicated quantitative test modal device according to an embodiment of the present invention;

[0028] Figure 3 A second schematic diagram of the overall structure of a dedicated quantitative test modal device according to an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of a main control module in an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of a high-precision excitation force control module in an embodiment of the present invention;

[0031] Figure 6 Schematic diagram of a micrometer-level position control module in an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of a human-computer interaction module in an embodiment of the present invention;

[0033] Figure 8 Schematic diagram of an electric control box in an embodiment of the present invention;

[0034] Fig. 9 It is a flow chart of the test mode-specific automatic control strategy in an embodiment of the present invention;

[0035] In the figure: 1-main control module, 2-high-precision excitation force control module, 3-micron-level position control module, 4-human-computer interaction module, 5-integral support structure, 6-electric slide, 7-connector between slide and intelligent hammer, 8-intelligent hammer, 9-reinforcement rib, 10-lifting platform, 11-test platform, 12-bracket, 13-movable support foot, 14-electric control box, 15-CPU module, 16-DIO module, 17-intelligent hammer body, 18-intelligent hammer head, 19-grating ruler, 20-photoelectric switch, 21-button, 22-touch screen, 23-warning light, 24-emergency stop button. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0037] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0038] An embodiment of the present invention provides a quantitative test modal device, comprising: a main control module, a high-precision excitation force control module, a micron-level position control module and an overall supporting structure, wherein the main control module is control-connected to the high-precision excitation force control module and the micron-level position control module respectively, and the main control module, the high-precision excitation force control module and the micron-level position control module are all arranged on the overall supporting structure; the overall supporting structure comprises a test platform, the micron-level position control module comprises an electric slide fixed on the test platform, the main control module is control-connected to the electric slide, and is used to output a pulse signal with a controllable quantity and phase to control the electric slide to perform micron-level movement in the axial direction; the high-precision excitation force control module comprises an intelligent force hammer, which is fixedly arranged on the electric slide, and is control-connected to the main control module, and is used to quantitatively output the excitation force according to the knocking control instruction output by the main control module.

[0039] In a specific implementation of this embodiment, the electric slide includes a lifting platform and an electric slide rod. The lifting platform is fixed on the test platform. The lifting drive end of the lifting platform is connected to the electric slide rod, which is used to control the electric slide rod to perform micron-level movement in the axial direction according to the control instructions output by the main control module; the intelligent force hammer is fixed on the electric slide rod.

[0040] In order to accurately control the movement of the electric slide rod, in a specific implementation of the present embodiment, the micron-level position control module also includes a grating ruler, which is control-connected to the main control module. The grating ruler is arranged on the electric slide rod and is used to provide the main control module with real-time feedback of the moving position and direction information of the electric slide rod, so as to feedback control the micron-level displacement movement of the electric slide rod.

[0041] In a specific implementation of this embodiment, photoelectric switches are respectively installed at both ends of the electric slide bar, and the photoelectric switches are connected to the main control module to indicate the upper and lower limits of the electric slide bar's stroke, so as to control the micron-level displacement movement of the electric slide bar through feedback from the main control module.

[0042] In a specific implementation of this embodiment, it also includes a human-computer interaction module, which is controlled and connected to the main control module. The human-computer interaction module includes a button and an emergency stop button, which is used to detect the electrical signals of the button and the emergency stop button in real time through the main control module to execute the corresponding operation of the button; the human-computer interaction module also includes a touch screen and an alarm light. The main control module exchanges data with the touch screen through the RS485 industrial communication bus, receives parameter settings and control instructions from the touch screen, and displays the working status and parameters of the device in real time; the alarm light is used to make an audible and visual alarm according to the control instructions of the main control module.

[0043] In a specific implementation of this embodiment, the main control module includes a CPU module and a DIO module, and the CPU module and the DIO module are bidirectionally connected. The CPU module is used for programming to implement the test modal automatic control strategy, as well as the input instruction execution and real-time status display of the device of the human-computer interaction module, and the servo drive of the electric slide and the striking control of the intelligent hammer are realized through the DIO module.

[0044] In order to enhance the stability of the electric slide bar, in a specific implementation of this embodiment, a reinforcing rib is further included, one end of the reinforcing rib is fixed to the electric slide bar, and the other end of the reinforcing rib is fixed to the test platform to stabilize the electric slide bar.

[0045] In a specific implementation of this embodiment, an electric control box is also included, and the human-computer interaction module and the main control module are installed in the electric control box.

[0046] In order to facilitate the movement of the device, in a specific implementation of this embodiment, the overall supporting structure also includes a bracket and a movable foot, the test platform is fixed on the bracket, and the movable foot is arranged at the bottom of the bracket.

[0047] like Figure 1-Figure 8 As shown, Figure 1 The figure is a schematic diagram of the overall special quantitative test modal device. The device consists of a main control module 1, a high-precision excitation force control module 2, a micron-level position control module 3, a human-computer interaction module 4 and an overall support structure 5, and can realize the test modal analysis of quantitative excitation force and micron-level excitation position positioning.

[0048] Figure 2 The first schematic diagram of the overall structure of the special quantitative test modal device. The overall structure of the device includes an electric slide 6, a connector 7 between the slide and the intelligent hammer, an intelligent hammer 8, a reinforcing rib 9, a lifting platform 10, a test platform 11, a bracket 12 and a movable support 13. Among them, the electric slide 6 is used to realize the positioning of the excitation position, the intelligent hammer 8 is used to realize the quantitative output of the excitation force, the reinforcing rib 9 is used to stabilize the electric slide 6, the lifting platform 10 is used to realize the adjustment of the overall height of the electric slide, and the test platform 11, the bracket 12 and the movable support 13 are used to support the above various structures and devices.

[0049] Figure 3 The second schematic diagram of the overall structure of the special quantitative test modal device. The device also includes an electric control box 14 for installing components of the main control module 1, the human-machine interaction module 4, and other necessary drivers and circuit modules of the device.

[0050] Figure 4The main control module is shown in FIG. 1 . The main control module 1 includes a CPU module 15 and a DIO module 16 of a self-developed main control unit dedicated to the test mode. The CPU module 15 is mainly used to program and implement the automatic control strategy dedicated to the test mode, as well as the input command execution and real-time status display of the device of the human-computer interaction module 4, and realize the servo drive of the electric slide 6 and the tapping control of the intelligent hammer 8 through the DIO module 16. The CPU module 15 is designed with the GD32F303 chip. The GD32F303 chip uses the USART2 interface to realize RS485 communication through the SP3485 chip, thereby completing the data interaction with the touch screen 22. The GD32F303 chip is connected to the EL817 optocoupler isolation chip in the DIO module 16 through the GPIO interface to realize the input detection of digital quantities such as buttons and photoelectric switches. The GD32F303 chip realizes the output control of digital quantity signals and pulse signals such as electric slides and alarm lights through the GPIO interface, the TLP2814 optocoupler of the DIO module 16, and the IRF5210PBF field effect tube.

[0051] Figure 5 The schematic diagram of the high-precision excitation force control module is shown in FIG. The module uses an intelligent force hammer product, which includes an intelligent force hammer body 17 and an intelligent force hammer head 18. The product can realize automatic percussion excitation without double strikes, has high repetition accuracy, and a linear error of <1%. The percussion device has controllable excitation force, Ethernet communication capability and dedicated configuration software, can be remotely controlled on a computer, and also has data storage capability, excitation analog signal output function and certain data processing functions. The hammer head can be replaced to adapt to the excitation of different surfaces of the object being measured.

[0052] Figure 6 It is a schematic diagram of the micron-level position control module. In this module, the main control module 1 controls the electric slide 6 to perform micron-level movement in the axial direction by outputting a pulse signal with a controllable number and phase. At the same time, the moving position and direction of the electric slide are fed back in real time through the grating ruler 19, and the micron-level displacement movement of the electric slide 6 is feedback-controlled, thereby ensuring higher precision. In order to improve the safety of the entire device, photoelectric switches 20 are installed at appropriate positions at both ends of the electric control slide 6 to indicate the upper and lower limits of the travel of the electric slide 6. Once the slider of the electric slide 6 touches the photoelectric switch 20, it means that it has reached the limit, and further displacement in the direction beyond the limit is not allowed.

[0053] Figure 7Schematic diagram of the human-computer interaction module. In this module, the main control module 1 detects the electrical signals of the button 21 and the emergency stop button 24 in real time. If the button 21 is found to be pressed, the device starts to work. If the emergency stop button 24 is found to be pressed, all electric actuators are disconnected until the emergency stop button returns to normal. If an alarm occurs during the operation of the device, the main control module 1 controls the alarm light 23 to sound and light alarm until the alarm is confirmed or canceled. The main control module 1 exchanges data with the touch screen 22 through the RS485 industrial communication bus, receives parameter settings and control instructions from the touch screen 22, and displays the working status and parameters of the device in real time.

[0054] Figure 8 Schematic diagram of an electric control box. The electric control box is mainly used to place the electric control system components of the special quantitative test modal device. The box has movable fixed feet at the bottom, a switch is set in the front of the box, and a button 21, an alarm light 23, an emergency stop button 24 and a touch screen 22 are installed on the top of the box.

[0055] like Fig. 9 As shown, Fig. 9 This is a flow chart of the test mode-specific automatic control strategy of an embodiment of the present invention, and the control method thereof has the following steps:

[0056] S1: First, the dedicated quantitative test modal device is initialized, the PLC self-check and program start-up are completed, and the current progress and status of the device are prompted through the touch screen.

[0057] S2: Perform test modal analysis parameter configuration, including the key test parameters such as the excitation point division method of the test piece at different axial heights, the excitation force size and the number of excitations.

[0058] S3: Whether to enter the automatic mode. The special quantitative test modal device has two modes: manual mode and automatic mode. If entering the manual mode, the software process enters the S4 process. If entering the automatic mode, the software process enters the S6 mode.

[0059] S4: Manual modal test parameter modification. In manual mode, you can set the parameters such as the electric running speed of the 7 electric slide and the step length during single-step operation.

[0060] S5: After completing the manual modal test parameter modification, you can perform manual jog operation or single-step operation upward or downward.

[0061] S6: Automatic detection of the axial height of the test piece. This function is completed by combining 7 electric slides and 8 intelligent hammers. First, according to the detection interval in the test modal analysis parameter configuration, drive the 8 intelligent hammers for interval excitation, then record the excitation state fed back by the 8 intelligent hammers, determine the number of effective detection intervals, and then match them with several preset axial heights of the test piece to finally obtain the axial height of the test piece.

[0062] S7: Automatically divide the points in the axial direction of the test piece. After the axial height of the test piece is obtained in step S6, the excitation points are divided according to the number and position requirements of the excitation points of the test piece and the special requirements of the modal test.

[0063] S8: Tap and traverse the divided points. After completing step S7, the dedicated quantitative test modal device traverses and taps all points on the axis of the test piece according to the determined excitation points. After completion, the touch screen prompts that the automatic excitation is completed and re-enters step S3 mode selection.

[0064] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A quantitative test modal device, characterized in that: include: A main control module, a high-precision excitation force control module, a micron-level position control module and an overall support structure, wherein the main control module is controlled and connected with the high-precision excitation force control module and the micron-level position control module respectively, and the main control module, the high-precision excitation force control module and the micron-level position control module are all arranged on the overall support structure; The integral support structure includes a test platform, the micrometer-level position control module includes an electric slide fixed on the test platform, and the main control module is control-connected with the electric slide to output a pulse signal with controllable quantity and phase to control the electric slide to perform micrometer-level movement in the axial direction; The high-precision excitation force control module includes an intelligent hammer, which is fixedly arranged on the electric slide. The intelligent hammer is control-connected to the main control module and is used to quantitatively output the excitation force according to the knocking control instruction output by the main control module.

2. The quantitative test modal device according to claim 1, characterized in that: The electric slide includes a lifting platform and an electric slide rod. The lifting platform is fixed on the test platform. The lifting drive end of the lifting platform is connected to the electric slide rod, which is used to control the electric slide rod to perform micron-level movement in the axial direction according to the control instructions output by the main control module; the intelligent force hammer is fixed on the electric slide rod.

3. The quantitative test modal device according to claim 2, characterized in that: The micron-level position control module also includes a grating ruler, which is control-connected to the main control module. The grating ruler is arranged on the electric slide bar and is used to provide the main control module with real-time feedback of the moving position and direction information of the electric slide bar, so as to feedback control the micron-level displacement movement of the electric slide bar.

4. The quantitative test modal device according to claim 2, characterized in that: Photoelectric switches are installed at both ends of the electric slide bar, respectively. The photoelectric switches are connected to the main control module and are used to indicate the upper and lower limits of the electric slide bar's travel, so as to control the micron-level displacement movement of the electric slide bar through feedback from the main control module.

5. The quantitative test modal device according to claim 1, characterized in that: It also includes a human-computer interaction module, which is control-connected to the main control module. The human-computer interaction module includes a button and an emergency stop button, and is used to detect the electrical signals of the button and the emergency stop button in real time through the main control module to execute the corresponding operation of the button; the human-computer interaction module also includes a touch screen and an alarm light. The main control module exchanges data with the touch screen through the RS485 industrial communication bus, receives parameter settings and control instructions from the touch screen, and displays the working status and parameters of the device in real time; the alarm light is used to make an audible and visual alarm according to the control instructions of the main control module.

6. The quantitative test modal device according to claim 5, characterized in that: The main control module includes a CPU module and a DIO module. The CPU module and the DIO module are connected in bidirectional communication. The CPU module is used for programming to implement the test modal automatic control strategy, as well as the input instruction execution and real-time status display of the device of the human-computer interaction module, and the servo drive of the electric slide and the striking control of the intelligent hammer are realized through the DIO module.

7. The quantitative test modality device according to claim 2, characterized in that: It also includes a reinforcing rib, one end of which is fixed on the electric sliding rod, and the other end of which is fixed on the test platform to stabilize the electric sliding rod.

8. The quantitative test modality device according to claim 5, characterized in that: It also includes an electric control box, in which the human-machine interaction module and the main control module are installed.

9. The quantitative test modal device according to claim 1, characterized in that: The integral supporting structure further comprises a bracket and a movable support foot, the test platform is fixed on the bracket, and the movable support foot is arranged at the bottom of the bracket.

10. A control method for a quantitative test modal device according to any one of claims 1 to 9, characterized in that: include: S1: Initializing the quantitative test modal device, completing program self-check and startup; S2: Performing test modal analysis parameter configuration, wherein the parameters include the excitation point division method, excitation force magnitude, and excitation times of the test piece at different axial heights; S3: Determine the execution mode, which includes a manual mode and an automatic mode; if the manual mode is entered, the software process enters the process of S4; if the automatic mode is entered, the software process enters the process of S5; S4: In manual mode, set the electric running speed of the electric slide and the step length during single-step operation; perform manual jog operation or single-step operation upward or downward; S5: In the automatic mode, according to the detection interval in the test modal analysis parameter configuration, the intelligent hammer is driven to perform interval excitation, the excitation state fed back by the intelligent hammer is recorded, the number of effective detection intervals is determined, and then the effective detection intervals are matched with the preset multiple axial heights of the test piece to obtain the final axial height of the test piece; S6: After the axial height of the test piece is obtained, the excitation points are divided according to the number of excitation points and excitation position requirements of the test piece and the requirements of the modal test to obtain all specific excitation points; S7: Traverse and strike all specific excitation points on the axis of the test piece.

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