Magnetostriction positioning and vibration isolation integrated test platform based on hydraulic amplification

Abstract

The invention belongs to the field of integration of positioning and vibration isolation, and provides an integrated testing platform for positioning and magnetostrictive vibration isolation based on hydraulic amplification. The vibration exciter outputs interference vibration signals through tiny deformation generated by an external magnetic field and transmits the interference vibration signals to the vibration isolator, the vibration isolator combines the magnetostrictive effect and the vibration isolation technology, displacement is precisely positioned and amplified through hydraulic amplification, and meanwhile liquid damping is provided to improve the vibration isolation effect. Different sensors are used for collecting excitation signals and response signals, a control method combining feed-forward compensation and feedback adjustment is designed, interference of external vibration on a test platform is eliminated in cooperation with an optical platform, and high-precision positioning, dynamic adjustment and vibration suppression are conducted on a load. According to the integrated design, high-precision and high-stability work of the platform in various complex environments can be guaranteed, the reliability of test data is greatly improved, and the platform can be widely applied to the fields with high requirements such as optical experiments, precision measurement and remote sensing mapping.

Description

Technical Field

[0001] The invention relates to an integrated testing platform with magnetostrictive actuation, precise positioning, displacement amplification and vibration isolation. Background Art

[0002] The integrated positioning and vibration isolation test platform is usually installed on an optical platform, which can provide a high-precision and high-stability test environment for it. The vibration generated by the exciter is transmitted to the vibration isolator, which identifies the disturbance displacement signal and outputs the vibration isolation signal. The vibration isolation signal is amplified by displacement to accurately position the load installed on it and provide a stable working environment. The magnetostrictive positioning and vibration isolation integrated test platform based on hydraulic amplification uses magnetostrictive materials as the core driving element. It has three functions: precision positioning, displacement amplification and vibration isolation. Through the precise control of magnetostrictive materials, it can amplify tiny deformations. In cooperation with sensors and control systems, it can provide high-precision, high-stability vibration isolation and positioning functions in the fields of precision optical experiments, precision measurements and remote sensing mapping, making it widely used in high-requirement fields such as optical experiments and precision measurements. At present, traditional test platforms mainly rely on mechanical vibration isolation systems and drive devices to provide a stable environment. However, when faced with high-precision test requirements, there is often insufficient low-frequency vibration isolation and limited effect, which makes it difficult to meet the vibration isolation requirements in high-precision tests. In addition, traditional test platforms usually rely on mechanical transmission and friction elements, such as lead screws and guide rails. These components will wear out during long-term use, resulting in a decrease in system stability and repeatability. Therefore, the development of an integrated positioning and vibration isolation test platform with precise positioning, good vibration isolation performance, and long-term stable operation has become a key technology in the field of precision testing. This can not only significantly improve the system stability in optical experiments, precision measurements and other fields, but also expand its application potential in high-demand industries such as aerospace, precision manufacturing, and geological exploration. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide an integrated magnetostrictive positioning and vibration isolation test platform based on hydraulic amplification. The platform uses magnetostrictive materials as the core driving element. The exciter outputs an interfering vibration signal through the tiny deformation generated by the external magnetic field and transmits it to the vibration isolator. The vibration isolator combines the magnetostrictive effect with the precision positioning amplification and vibration isolation technology to perform high-precision positioning, dynamic adjustment and vibration suppression on the load. The platform can generate an excitation vibration signal while accurately positioning and isolating the vibration of the load, and cooperate with the optical platform to eliminate the interference of external vibration on the test platform. This integrated design can ensure that the platform works with high precision and high stability in various complex environments, greatly improving the reliability of the test data, and making it widely used in high-demand fields such as optical experiments, precision measurements, and remote sensing mapping.

[0004] To achieve the above-mentioned purpose, the present invention is a magnetostrictive positioning and vibration isolation integrated test platform based on hydraulic amplification, which includes: an optical platform, a base plate, an exciter, a linear guide column, a connecting plate, a vibration isolator, a hydraulic amplifier, a support seat, a sensor bracket, an excitation displacement sensor, and a load displacement sensor. The optical platform is used as an installation platform for the positioning, amplification, and vibration isolation integrated test platform, which can reduce the interference of external vibration on the experiment, provide a stable working environment for the entire test platform, and ensure the stability of the test. The exciter is installed on the optical platform through the base plate and fixed to the connecting plate supported by four guide pillars by bolts. The sensor is connected to the support seat through the sensor bracket and installed and fixed on another optical platform. The vibration isolator is installed on the connecting plate to receive the vibration signal generated by the exciter. The displacement sensor identifies the vibration signal and transmits it to the controller. At the same time, the controller outputs a control signal to the vibration isolator to accurately position and isolate the inertial load thereon. The displacement sensor transmits the signal after positioning and vibration isolation as a feedback signal to the controller, and outputs it to the vibration isolator after being processed by the control algorithm, forming a feedback control system for positioning, amplification, and vibration isolation. The number of mass blocks is adjusted to test the positioning and vibration isolation of different inertial loads.

[0005] Working process of magnetostrictive actuation positioning amplification vibration isolation integrated test platform: The working process of magnetostrictive actuation positioning amplification vibration isolation integrated test platform is as follows: The optical platform serves as the installation base of the entire test system and provides a stable working environment. The exciter is installed on the optical platform and connected to the connecting plate through four guide columns to form a stable vibration transmission structure. The exciter generates a vertical vibration signal, which acts on the magnetostrictive isolator on it through the connecting plate. After the magnetostrictive isolator receives the vibration signal from the exciter, the displacement sensor collects the signal and transmits it to the controller. The controller processes the signal transmitted by the displacement sensor, calculates the appropriate feedforward compensation signal through the built-in control algorithm, and transmits the feedforward signal to the magnetostrictive isolator. Under the action of the feedforward signal, the magnetostrictive isolator applies a magnetic field and produces a small deformation. At the same time, the displacement amplifier connected to it amplifies the small deformation and performs feedforward adjustment to form a feedforward control system to achieve precise positioning and vibration control of the inertial load. Furthermore, after feedforward control, the displacement sensor monitors the displacement of the inertial load and transmits the signal as a feedback signal to the controller, forming a control system that combines feedforward and feedback to position and isolate the inertial load. At the same time, by adjusting the number of mass blocks, it can adapt to the positioning, amplification and vibration isolation requirements of different inertial loads.

[0006] Preferably, the optical platform is used as the installation reference, which has strong shock resistance and stability, can effectively reduce the interference of external vibration on the experiment and ensure the accuracy of the test results;

[0007] Preferably, the sensor and the integrated test platform are installed on different optical platforms respectively to avoid the vibration generated by the test platform itself from affecting the sensor and ensure the reliability of the measurement signal;

[0008] Preferably, the vibration exciter and the vibration isolator are designed as a whole in a stacked manner, which can reduce the installation space and form a stable vibration transmission structure;

[0009] Preferably, four linear guide pillars are used as auxiliary supports between the vibration exciter and the vibration isolator, which can play a guiding role while eliminating the interference of vibrations of other degrees of freedom and ensure the transmission of vibrations in the vertical direction;

[0010] Preferably, magnetostrictive materials are used as the driving device, which have high energy density and the ability to withstand large loads;

[0011] Preferably, the vibration isolator is used in combination with a hydraulic amplifier to amplify the displacement and broaden the positioning and vibration isolation range, while the damping hole design added to the hydraulic amplifier can enhance the vibration isolation effect;

[0012] Preferably, the hydraulic amplifier uses a flexible diaphragm as the output and input ends to avoid leakage and ensure reliability;

[0013] Preferably, dual displacement sensors are used to collect signals to form an active control system combining feedforward and feedback to achieve precise positioning and vibration control of inertial loads;

[0014] Preferably, the output rod is guided by a linear bearing to improve the load-bearing capacity and anti-interference characteristics.

[0015] The present invention is a magnetostrictive actuated positioning, amplification and vibration isolation integrated test platform. A magnetostrictive exciter and a vibration isolator are combined to form a stable vibration transmission structure. An optical platform is used to eliminate external vibration interference. The vibration isolator is used in conjunction with a hydraulic amplifier to perform positioning and vibration isolation tests on inertial loads. A dual displacement sensor is used to collect excitation signals and response signals, and a control method combining feedforward compensation and feedback regulation is designed to achieve precise positioning and vibration control of inertial loads. At the same time, the output rod is guided by a linear bearing to improve the load-bearing capacity and anti-interference characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is described below in conjunction with the accompanying drawings.

[0017] Figure 1 is a schematic diagram of a magnetostrictive positioning and vibration isolation integrated test platform based on hydraulic amplification according to one embodiment of the present invention;

[0018] Figure 2 is a schematic structural diagram of a vibration exciter according to an embodiment of the present invention;

[0019] Figure 3 is a schematic structural diagram of a vibration isolator according to an embodiment of the present invention;

[0020] Figure 4 is a schematic structural diagram of a hydraulic amplifier according to an embodiment of the present invention;

[0021] Figure 5 is a control principle diagram of a positioning and vibration isolation integrated system according to an embodiment of the present invention; DETAILED DESCRIPTION

[0022] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the implementation described below is only exemplary and not restrictive.

[0023] like Figure 1 As shown, a magnetostrictive positioning and vibration isolation integrated test platform based on hydraulic amplification includes: an optical platform 1, a base plate 2, a vibration exciter 3, a linear guide pillar 4, a connecting plate 5, a vibration isolator 6, a hydraulic amplifier 7, a support seat 8, a sensor bracket 9, an excitation displacement sensor 10, and an output displacement sensor 11. The bottom of the vibration exciter 3 is installed and fixed on the optical platform 1 through the base plate 2, and the top is fixed to the connecting plate 5 by bolts to form a stable vibration transmission structure. The base plate 2 and the connecting plate 5 are connected together through the linear guide pillar 4 to assist in supporting the vibration exciter 3 and guide the vibration. The vibration isolator 6 is installed on the connecting plate 5, and its output end is connected to the hydraulic amplifier 7 to amplify the displacement. The support seat 8 is installed on the optical platform. The excitation displacement sensor 10 is fixed on the support seat 8 through the sensor bracket 9, and the excitation displacement is collected as a feedforward signal. The load displacement sensor 11 collects the load displacement as a feedback signal to form a positioning and vibration isolation integrated control system with feedforward compensation and feedback adjustment.

[0024] like Figure 2As shown, it is a schematic diagram of the structure of the exciter 3, including: an exciter housing 12, an excitation yoke 13, an excitation magnetostrictive rod 14, an excitation solenoid 15, an excitation permanent magnet 16, a pressure rod 17, an exciter end cover 18, a large disc spring 19, a large pre-tightening nut 20, and an excitation force sensor 21. The excitation permanent magnet 16 is installed in the center of the exciter housing 12 to provide a bias magnetic field for the magnetostrictive material. The wire of the excitation solenoid 15 is evenly wound around the excitation yoke 14 through the opening of the exciter housing 11. On the outside, the exciting magnetostrictive rod 14 is located at the center of the exciting magnetic yoke 13 and is connected to the external threaded end of the exciting force sensor 21 through a pressure rod 17 at the top; the exciter end cover 18 is fixed to the exciter housing 12 by bolts and presses the exciting permanent magnet 16 and is threaded inside, and a large disc spring 19 and a large pre-tightening nut 20 are pressed on the pressure rod 13. The large disc spring 19 is compressed by the rotation of the large pre-tightening nut 20 to apply pre-pressure to the exciting magnetostrictive rod 14, thereby improving the displacement output capacity of the exciting magnetostrictive rod 14.

[0025] like Figure 3 , which is a schematic diagram of the structure of the vibration isolator 6, including: a vibration isolator housing 22, a permanent magnet 23, a yoke 24, a solenoid 25, a magnetostrictive rod 26, a connecting rod 27, a force sensor 28, an end cover 29, a disc spring 30, an output rod 31, and a pre-tightening nut 32; the vibration isolator housing 22 is a hollow structure and is fixed to the connecting plate 5 with bolts, and the paired permanent magnets 23 are located at the center of the vibration isolator housing 22 to provide a bias magnetic field, thereby improving the magnetic field uniformity and bidirectional output displacement capability of the magnetostrictive rod 26, and the wires of the solenoid 25 are evenly wound on the magnetostrictive rod 26. On the outside of the yoke 24, the magnetostrictive rod 26 is located at the center of the yoke 24 and is connected to the internal thread end of the force sensor 28 through the connecting rod 27. The external thread end of the force sensor 28 is connected to the output rod 31 as a whole. The end cover 29 is fixed to the vibration isolator housing 22 by bolts and presses the permanent magnet 23. The external thread of the pre-tightening nut 32 is rotated with the internal thread of the end cover 29. The pre-pressure is applied to the magnetostrictive rod 26 by rotating the pre-tightening nut 32 to compress the disc spring 30, thereby improving the magnetic field uniformity and bidirectional output displacement capacity of the magnetostrictive rod.

[0026] like Figure 4As shown, it is a schematic diagram of the structure of the hydraulic amplifier 7, including: a large flexible diaphragm 33, a fillet 34, a film 35, a damping hole 36, a large cavity 37, an amplifier housing 38, a small cavity 39, a small flexible diaphragm 40, a bearing seat 41, a linear bearing 42, a load output rod 43, and a load 44; the middle of the amplifier housing 38 is processed into a large cavity 37 and a small cavity 39, wherein the large cavity 37 is truncated, and the small cavity 39 is cylindrical, and the two are connected as a whole through the damping hole 36, the large flexible diaphragm 33 is fixed to the large cavity side by bolts and sealed, and the small flexible diaphragm 40 is fixed to the large cavity side by bolts and sealed, and the small flexible diaphragm 40 is fixed to the large cavity side by bolts and sealed. The diaphragm 40 is fixed on the side of the small cavity and sealed. The deformation of the large flexible diaphragm 33 squeezes the liquid in the large cavity 37. The liquid flows through the damping hole into the small cavity 39 to squeeze the small flexible diaphragm 40. Since the hydraulic oil is incompressible, the deformation volume of the large flexible diaphragm 33 is the same as the deformation volume of the small flexible diaphragm 40, and the area of ​​the large flexible diaphragm 33 is larger. Therefore, the output displacement amplification factor of the small flexible diaphragm 40 is the ratio of the area of ​​the large flexible diaphragm 33 to the area of ​​the small flexible diaphragm 40, which plays a role in displacement amplification. At the same time, the hydraulic oil shuttles back and forth in the damping hole 36 to consume vibration energy.

[0027] like Figure 5 As shown, it is a control principle diagram of the integrated positioning and vibration isolation system. The position signal is directly given or the excitation displacement signal is collected by the excitation displacement sensor 10 as the input of the system and transmitted to the controller. At the same time, the signal is also used as a feedforward signal to directly perform feedforward compensation control on the vibration isolator 6. The controller outputs a signal to adjust the current of the solenoid 25 to generate an induced magnetic field to control the output of the vibration isolator 6. The output is amplified by the hydraulic amplifier to drive the load output rod 43 and the load 44 to position and isolate the load 44. The load displacement sensor 11 collects the displacement signal of the load 44 and inputs the signal as a feedback signal to the controller, forming a positioning and vibration isolation integrated control system combining feedforward and feedback.

[0028] Based on this disclosure, many variations in the configuration and operational sequence of the illustrated and described features will be apparent to those skilled in the art. Therefore, it should be appreciated that various changes can be made to this patent without departing from the spirit and scope of the claimed subject matter.

Claims

1. A magnetostrictive positioning and vibration isolation integrated test platform based on hydraulic amplification, characterized in that include: An optical platform (1), a base plate (2), a vibration exciter (3), a linear guide support (4), a connecting plate (5), a vibration isolator (6), a hydraulic amplifier (7), a support seat (8), a sensor bracket (9), an excitation displacement sensor (10), and an output displacement sensor (11). The bottom of the vibration exciter (3) is mounted on the optical platform (1) through the base plate (2), and the top is fixed to the connecting plate (5) by bolts to form a stable vibration transmission structure. The base plate (2) and the connecting plate (5) are connected as a whole through the linear guide support (4), which provides auxiliary support for the vibration exciter (3) and guides the vibration at the same time. The vibration isolator (6) is mounted on the connecting plate (5), and the output end is connected to the hydraulic amplifier (7). The support seat (8) is mounted on the optical platform (1). The excitation displacement sensor (10) is fixed to the support seat (8) through the sensor bracket (9), and the excitation displacement is collected as a feedforward signal. The load displacement sensor (11) collects the load displacement as a feedback signal, thereby forming a positioning vibration isolation integrated control system with feedforward compensation and feedback regulation. Vibrator (3), The invention is characterized in that: an exciter housing (12), an excitation yoke (13), an excitation magnetostrictive rod (14), an excitation solenoid (15), an excitation permanent magnet (16), a pressure rod (17), an exciter end cover (18), a large disc spring (19), a large pre-tightening nut (20), and an excitation force sensor (21); the excitation permanent magnet (16) is installed at the center of the exciter housing (12) to provide a bias magnetic field; the excitation solenoid (15) is evenly wound around the outside of the excitation yoke (13); the excitation magnetostrictive rod (14) is located at the excitation end of the exciter housing (12); and the excitation magnetostrictive rod (14) is located at the excitation end of the exciter housing (12). The center and top of the excitation yoke (13) are connected to the external thread end of the exciting force sensor (21) through a pressure rod (17); the center of the exciter end cover (18) has an internal thread and is fixed to the exciter housing (12) by bolts and presses the exciting permanent magnet (16); a large disc spring (19) and a large pre-tightening nut (20) are pressed on the pressure rod (13); the large disc spring (19) is compressed by the rotation of the large pre-tightening nut (20) to apply pre-pressure to the exciting magnetostrictive rod (14), thereby improving the displacement output capacity of the exciting magnetostrictive rod (14); The vibration isolator (6) is characterized by comprising: a vibration isolator housing (22), a permanent magnet (23), a yoke (24), a solenoid (25), a magnetostrictive rod (26), a connecting rod (27), a force sensor (28), an end cover (29), a disc spring (30), an output rod (31), and a pre-tightening nut (32). The vibration isolator housing (22) is a hollow structure and is fixed to a connecting plate (5) by bolts. A pair of permanent magnets (23) are located at the center of the vibration isolator housing (22) to provide a bias magnetic field for the magnetostrictive rod (26). The wire of the solenoid (25) is evenly wound around the outside of the yoke (24). The telescopic rod (26) is located at the center of the magnetic yoke (24) and is connected to the internal thread end of the force sensor (28) through a connecting rod (27) at the top. The external thread end of the force sensor (28) is connected to the output rod (31) as a whole. The end cover (29) is fixed to the vibration isolator housing (22) by bolts and presses the permanent magnet (23). The external thread of the pre-tightening nut (32) is rotated with the internal thread of the end cover (29). The pre-pressure is applied to the magnetostrictive rod (26) by the rotation compression disc spring (30) of the pre-tightening nut (32), thereby improving the magnetic field uniformity and bidirectional output displacement capacity of the magnetostrictive rod (26). The hydraulic amplifier (7) is characterized by: a large flexible diaphragm (33), a rounded corner (34), a film (35), a damping hole (36), a large cavity (37), an amplifier housing (38), a small cavity (39), a small flexible diaphragm (40), a bearing seat (41), a linear bearing (42), a load output rod (43), and a load (44). The middle of the amplifier housing (38) is a truncated cone-shaped large cavity (37) and a cylindrical small cavity (39), and the two are connected by a damping hole. The damping holes (36) are connected as one body, the large flexible diaphragm (33) is fixed to the large volume cavity (37) side by bolts and sealed, the small flexible diaphragm (40) is fixed to the small volume cavity (39) side and sealed, the deformation of the large flexible diaphragm (33) squeezes the liquid in the large volume cavity (37), the liquid flows through the damping hole into the small volume cavity (39) and squeezes the small flexible diaphragm (40) to play a role in displacement amplification, and at the same time, the hydraulic oil shuttles back and forth in the damping hole (36) to play a role in consuming vibration energy; The control principle of the integrated positioning and vibration isolation system includes: a given position signal or an excitation displacement signal collected by an excitation displacement sensor (10) as the input of the system and transmitted to a controller, and the signal is also used as a feedforward signal to directly perform feedforward compensation control on the vibration isolator (6), and the controller outputs a signal to adjust the current of the solenoid (25) to generate an induced magnetic field to control the output of the vibration isolator (6), and the output is amplified by a hydraulic amplifier to drive the load (44), and the load (44) is positioned and isolated, and the load displacement sensor (11) collects the displacement signal of the load (44), and the signal is input to the controller as a feedback signal, forming a positioning and vibration isolation integrated control system combining feedforward and feedback.

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