Multi-flexible body coupling shock absorption structure vibration measurement and control device and method

Abstract

The application discloses a kind of multi-flexible body coupling damping structure vibration measurement and control device, comprising: multi-flexible body damping structure, vibration detection part, electromagnetic energy conversion part, vibration excitation part and drive control part;Multi-flexible body damping structure includes upper layer flexible beam coupling body, middle layer body and lower layer flexible beam coupling body, top support plate is connected with upper layer flexible beam coupling body, bottom support plate is connected with lower layer flexible beam coupling body, middle layer body is connected with upper layer flexible beam coupling body and lower layer flexible beam coupling body respectively;Piezoelectric driver and piezoelectric sensor are pasted on first flexible beam, first flexible beam and vertex support, first flexible beam and square support, square support and second flexible beam are all connected by right-angle support.Vibration generator makes device produce vibration, vibration signal is acquired using piezoelectric sensor and acceleration sensor, vibration control under the structure of multi-flexible body coupling is detected, and it is applied to the field of vibration measurement and control of flexible multilayer architecture.

Description

Vibration Measurement and Control Device and Method for Multi-Flexible Body Coupled Vibration Reduction Structure Technical Field

[0001] This invention relates to the field of vibration control of coupled flexible beams, and more specifically, to a vibration measurement and control device and method for multi-flexible body coupled damping structures. Background Technology

[0002] During an earthquake, the shaking of buildings can cause them to disintegrate and collapse, resulting in various irreparable losses and injuries. Modern building designs typically prioritize earthquake resistance and seismic performance to ensure the safety of people and property during earthquakes. General building structural designs emphasize a rational layout to distribute energy to various parts when the facade suddenly changes, thus achieving good seismic performance. Earthquakes have magnitude and intensity. Magnitude measures the amount of energy released by an earthquake, while intensity indicates the degree of damage to buildings, structures, and terrain. Generally, earthquakes of magnitude 4 or higher will cause damage to buildings on the ground. At intensity 4, buildings begin to shake noticeably, and in severe cases, damage may occur. Therefore, designing a new type of vibration damping platform and monitoring its vibration is necessary.

[0003] In recent years, the design of building vibration reduction systems has become a key and hot research topic in my country. For large structures like vibration reduction platforms, rigid frames are generally used to simulate vibrations, and the influence of hinge stiffness is ignored. Vibration transmission mainly utilizes various flexible beams, and vibration measurement employs piezoelectric sensors and accelerometers, which offer high accuracy, fast response, and convenient installation, enabling faster and more precise transmission of vibration signals when vibration occurs. Vibration control of the flexible beams uses piezoelectric actuators and electromagnetic energy converters. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of existing technologies in the design of vibration damping structures and the field of vibration measurement and control, and to provide a vibration measurement and control device and method for multi-flexible body coupled vibration damping structures, which utilizes the magnetic field generated by the current in the coil and the damping generated by the magnet to actively control the vibration of multi-layer vibration damping structures.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A vibration monitoring and control device for a multi-flexible body coupled damping structure includes: a multi-flexible body damping structure, a vibration detection part, an electromagnetic energy conversion part, a vibration excitation part, and a drive control part;

[0007] The multi-flexible body damping structure includes an upper flexible beam coupling body, a middle body and a lower flexible beam coupling body. The top support plate is connected to the upper flexible beam coupling body, the bottom support plate is connected to the lower flexible beam coupling body, and the middle body is connected to both the upper and lower flexible beam coupling bodies.

[0008] The upper flexible beam coupling body and the lower flexible beam coupling body include a first flexible beam, a vertex bracket, a right-angle bracket, a center bracket, a second flexible beam, and a square bracket. The vertex bracket and the square bracket are connected to the vertically placed first flexible beam through the right-angle bracket. The center bracket and the square bracket are connected to the horizontally placed second flexible beam through the right-angle bracket. The first flexible beam, the vertex bracket, the center bracket, the second flexible beam, and the square bracket are respectively connected to the right-angle bracket. The vertex bracket is connected to the top support plate or the bottom support plate through connecting rods. The center bracket is connected to the top support plate or the bottom support plate through coupling springs.

[0009] The middle layer body includes a vertex support, a right-angle support, a central support, a rigid beam, and a fixed spring. The vertex supports are connected to each other through right-angle supports and rigid beams. The vertex supports are connected to the right-angle supports, and the right-angle supports are connected to the rigid beams. The central support is connected to the vertex supports through fixed springs. The vertex supports are connected to the vertex supports of the upper flexible beam coupling body and the lower flexible beam coupling body through connecting rods. The central support is connected to the central support of the upper flexible beam coupling body and the lower flexible beam coupling body through coupling springs.

[0010] The vibration detection section includes an accelerometer and a piezoelectric sensor. The accelerometer is mounted on the central support of each layer, and the piezoelectric sensor is set on the first flexible beam.

[0011] The vibration excitation part includes a vibrator, a support guide rod, a linear bearing, and a support spring. One end of the support guide rod is fixed to the experimental platform, and the other end of the support guide rod passes through the linear bearing and is fixed to the bottom support plate. The support spring is located between the support guide rod and the linear bearing. The vibrator is fixed to the experimental platform and located below the bottom support plate. The vibrator is connected to the bottom support plate through a top rod.

[0012] The electromagnetic energy conversion section includes a rigid support beam, a coil, and an extension rod. The coil is wound around the coil support. One end of the rigid support beam is fixed to the experimental table, and the other end of the rigid support beam is connected to the coil support. The coil is coaxial with the central support. The bottom end of the extension rod is connected to the central support of the middle layer. The extension rod passes through the central support of the upper layer and the top support plate. The top end of the extension rod enters the coil support and connects with the magnet.

[0013] The drive control section includes a piezoelectric actuator, an electromagnetic energy conversion circuit, a charge amplifier, a piezoelectric amplifier circuit, a terminal block, a motion control card, and a computer. The piezoelectric actuator is mounted on the first flexible beam. The electromagnetic energy conversion circuit is connected to coils at both ends. The charge amplifier is connected to the accelerometer and the piezoelectric sensor respectively. The piezoelectric amplifier circuit is connected to the piezoelectric actuator. The electromagnetic energy conversion circuit, the charge amplifier, the piezoelectric amplifier circuit, and the motion control card are all connected to the terminal block. The computer is connected to the motion control card.

[0014] Preferably, the upper vertex support is connected to the top support plate via three connecting rods, the middle vertex support is connected to the upper and lower vertex supports via three connecting rods respectively, and the lower vertex support is connected to the bottom support plate via three connecting rods.

[0015] Preferably, the vibration excitation part includes three support guide rods, three linear bearings, and three support springs. The three linear bearings are respectively located at the three vertices of the bottom support plate, and the three support guide rods pass through the three linear bearings respectively.

[0016] Preferably, the rigid support beam is formed by two support beams hinged vertically together, and one end of the rigid support beam is fixed to the experimental table through the rigid support beam base.

[0017] Preferably, the coil support is 85mm away from the center support of the upper flexible beam coupling body.

[0018] Preferably, the coil is made of copper wire with a diameter of 8mm, and the coil support is made of insulated steel material.

[0019] Preferably, the piezoelectric sensor is a piezoelectric ceramic sheet, and the piezoelectric sensor is disposed on the centerline of the width direction of the first flexible beam, 100mm away from the edge line of the width direction near the vertex support.

[0020] Preferably, the piezoelectric actuators are disposed at the fixed end of the first flexible beam near the vertex support. Each first flexible beam is provided with 4 piezoelectric actuators, which are symmetrically installed on both sides. Two piezoelectric actuators on the same end face are connected in parallel and are symmetrical about the centerline of the width direction of the flexible beam.

[0021] Preferably, the piezoelectric actuator is positioned 60 mm from the fixed end of the first flexible beam near the top support, with an attitude angle of 90°, and 25 mm from the edge of the first flexible beam along its length.

[0022] A vibration monitoring and control method for a multi-flexible body coupled vibration reduction structure, applied to the vibration monitoring and control device for the multi-flexible body coupled vibration reduction structure described above, includes the following steps:

[0023] S1: The computer-controlled vibrator is used to excite the vibration and execute the preset desired trajectory, thereby exciting the multi-flexible body damping structure to generate corresponding vibration signals.

[0024] S2: Use a piezoelectric sensor to detect the vibration of the first flexible beam and obtain the vibration signal of the first flexible beam. Use an accelerometer to detect the vibration of the central support and the second flexible beam and obtain the vibration signals of the central support and the second flexible beam.

[0025] S3: The vibration signals of the first flexible beam, the central support and the second flexible beam are processed by charge amplifiers and then transmitted to the motion control card through the terminal board. The motion control card converts the analog signals into digital signals and then transmits them to the computer.

[0026] S4: After the vibration signal is processed by the computer, a corresponding vibration feedback signal is obtained. The signal is then output to the piezoelectric amplifier circuit and the electromagnetic energy conversion circuit via the motion control card and terminal board. The vibration of the flexible beam is suppressed by the piezoelectric driver and the electromagnetic energy conversion part.

[0027] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0028] 1. This invention studies a vibration measurement and control method for multi-flexible body damping structures. The multi-flexible body damping structure contains both horizontally and vertically placed flexible beams. Compared with other research devices, it can better study the vibration control of horizontally and vertically placed flexible beam damping structures at the same time.

[0029] 2. This invention uses an electromagnetic energy conversion section to control the vibration displacement of a horizontally placed flexible beam connected to the central support of the middle layer. Compared with other controllers, it has a high energy conversion rate and high sensitivity. The electromagnetic energy conversion section uses the magnetic field generated by the current in the coil to interact with the magnetic field generated by the magnet coupled to the vibrating flexible beam, thereby achieving vibration suppression.

[0030] 3. This invention uses a reasonable mechanical design to connect springs to each layer and generates magnetic damping through electric current, to study the vibration characteristics of a multi-flexible damping structure with spring coupling and magnetic damping.

[0031] 4. This invention uses an accelerometer to detect the vibration signal of a horizontal flexible beam coupled to a central support. Compared with other sensors, it has the advantages of convenient installation, good dynamic performance, good linearity, and simple structure, and can perform more accurate measurement of the motion of the flexible beam.

[0032] 5. This invention employs multi-sensor measurement, including both accelerometers and piezoelectric sensors, which helps to improve the breadth and accuracy of the measurement. By fusing multiple sensors, the bending modes of the flexible coupled beam structure are identified and studied. Attached Figure Description

[0033] Figure 1 is a schematic diagram of the vibration measurement and control device for a multi-flexible body coupled vibration reduction structure.

[0034] Figure 2 is a side view of the vibration monitoring and control device for a multi-flexible body coupled vibration reduction structure.

[0035] Figure 3 is a schematic diagram of the upper flexible beam coupling body.

[0036] Figure 4 is a schematic diagram of the structure of the middle layer body.

[0037] Figure 5 is a schematic diagram of the exciter.

[0038] Figure 6 is a schematic diagram of the coil and coil support.

[0039] Figure 7 is a flowchart of the vibration control process of the vibration measurement and control device for a multi-flexible body coupled vibration reduction structure.

[0040] Explanation of icon numbers:

[0041] 1-First flexible beam; 2-Right-angle bracket; 3-Vertex bracket; 4-Central bracket; 5-Rigid beam; 6-Fixed spring; 7-Coupled spring; 8-Connecting rod; 9-Second flexible beam; 10-Acceleration sensor; 11-Square bracket; 12-Support guide rod; 13-Linear bearing; 14-Support spring; 15-Support guide rod base; 16-Bottom support plate; 17-Vibrator; 18-Vibrator base;

[0042] 19-Experimental platform; 20-Rigid support beam base; 21-Inverted L-shaped rigid support beam; 22-Coil; 23-Coil support; 24-Extending guide rod; 25-Piezoelectric sensor; 26-Piezoelectric actuator; 27-Top support plate; 28-Electromagnetic energy conversion circuit; 29-Charge amplifier; 30-Piezoelectric amplifier circuit; 31-Terminal board; 32-Motion control card; 33-Computer. Detailed Implementation

[0043] The vibration measurement and control device and method for multi-flexible body coupled damping structure of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0044] Referring to Figure 1, this invention discloses a vibration monitoring and control device for a multi-flexible body coupled damping structure. The device includes a multi-flexible body damping structure, a vibration excitation section, a vibration detection section, and a drive control section. This invention constructs a vibration monitoring and control device for a multi-flexible body damping structure with spring coupling, electromagnetic damping, and simultaneous control of horizontally and vertically placed flexible beams. It utilizes the magnetic field generated by the current in the coil and the damping generated by the magnet to actively control the vibration of the multi-flexible body damping structure.

[0045] The multi-flexible body damping structure includes an upper flexible beam coupled body, a middle body, and a lower flexible beam coupled body. The flexible beams are mainly distributed in the upper and lower flexible beam coupled bodies, and the structures of the upper and lower flexible beam coupled bodies are completely identical.

[0046] Please refer to Figures 1 and 2. The multi-flexible body damping structure consists of an upper flexible beam coupling body, a middle body, and a lower flexible beam coupling body, connected by eighteen connecting rods 8. Three connecting rods 8 connect the top supports 3 of each layer. The lower flexible beam coupling body is also connected to the bottom support plate 16 via nine connecting rods 8, each connecting rod 8 being fixed by bolts to the base. The upper flexible beam coupling body is connected to the top support plate 27 via nine connecting rods 8, each connecting rod 8 being fixed by bolts to the base.

[0047] Please refer to Figures 1 and 3. In the upper and lower flexible beam coupling bodies, three vertex supports 3 are placed at the three vertices. On the planes with a 120° angle on both sides of each vertex support 3, three right-angle supports 2 are fastened with screws. Each right-angle support 2 is fixed to a first flexible beam 1 by bolts. The other end of the first flexible beam 1 and the right-angle support 2 are connected to a square support 11 by bolts. The inner side of the square support 11 is connected to the second flexible beam 9 through the right-angle support 2, and its other end is connected to the central support 4 through the right-angle support 2.

[0048] Please refer to Figures 1 and 4. In the middle layer body, three vertex supports 3 are placed at the three vertices. On the two sides of each vertex support 3, two right-angle supports 2 are placed on a plane at a 120° angle and are fastened with screws. A square rigid beam 5 is fixed between the two right-angle supports 2. The inner side of the vertex support 3 is fastened with hooks and fixing springs 6 by screws. The other end of the fixing springs 6 is also connected to the central support 4 by hooks.

[0049] The middle layer body and the upper flexible beam coupling body, as well as the lower flexible beam coupling body, achieve vibration coupling through coupling springs 7. Three spring hooks are placed at the apex of each of the two sides of the central support 4 of the middle layer body, and three spring hooks are placed on the inner side of the central support 4 of the upper and lower flexible beam coupling bodies, respectively. The coupling springs 7 are suspended between the hooks to achieve coupling of the central support 4 between the layers.

[0050] The lower part of the top support plate 27 is fastened with a hook and a coupling spring 7 by screws. The other end of the coupling spring 7 is connected to the central support 4 of the upper flexible beam coupling body.

[0051] Please refer to Figures 1 and 5. The vibration excitation part includes a bottom support plate 16 and a vibrator 17. The vibrator 17 is fastened to the vibrator base 18 by a mechanical clamping device and screws. The vibrator 17 contacts the bottom support plate 16 through a push rod. When the vibrator 17 is working, the vibrator 17 drives the push rod to apply force to the bottom support plate 16, and the bottom support plate 16 vibrates under the action of force.

[0052] Linear bearings 13 are fixed at the three vertices of the bottom support plate 16. Three support guide rods 12 pass through the linear bearings 13 and are fastened to the experimental table 19 via the support guide rod base 15 and screws. There is a protrusion on the support guide rod 12 40mm away from the bottom of the bottom support plate 16. A support spring 14 is arranged between the protrusion and the linear bearing 13.

[0053] The bottom support plate 16 can remain stationary on the experimental table 19 without being subjected to force, under the action of the support guide rod 12, the support spring 14 and the linear bearing 13. When subjected to force, the bottom support plate 16 vibrates and excites the support spring 14, thereby driving the support guide rod 12 to make a small-amplitude piston movement in the linear bearing 13. The vibration exciter 17 excites the multi-flexible body damping structure, which facilitates the vibration detection of the multi-flexible body damping structure.

[0054] Please refer to Figures 1 and 7. The vibration detection section includes an accelerometer 10 and a piezoelectric sensor 25. The piezoelectric sensor 25 is used to detect the vibration signal of the first flexible beam 1, which is vertically placed between the upper flexible beam coupling body and the lower flexible beam coupling body. It converts the vibration signal into a corresponding electrical signal output based on its own sensing characteristics. After being amplified by the charge amplifier 29, the signal is transmitted to the motion control card 32 through the terminal board 31. The analog signal is then converted into a digital signal by the A / D conversion module inside the motion control card 32 and transmitted to the computer 33.

[0055] Accelerometer 10 is used to detect the vibration signals of the three central supports 4. After being amplified by charge amplifier 29, the signals are transmitted to motion control card 32 through terminal board 31. The analog signals are then converted into digital signals by A / D conversion module inside motion control card 32 and transmitted to computer 33.

[0056] The piezoelectric sensor 25 is made of piezoelectric ceramic and has geometric dimensions of 40mm×15mm×5mm. It is placed on the centerline of the width direction of the fixed end of the first flexible beam 1 near the vertex support 3, 100mm away from the width edge.

[0057] Accelerometer 10 is selected from the HBK Bruel & Kjaer vibration sensor series, specifically the 4384 piezoelectric charge accelerometer, which is suitable for high-frequency measurements and has a nominal sensitivity of [missing information]. The measurement frequency range is It features high sensitivity and wide bandwidth.

[0058] The drive control section includes a piezoelectric actuator 26, an electromagnetic energy conversion circuit 28, a charge amplifier 29, a piezoelectric amplifier circuit 30, a terminal board 31, a motion control card 32, and a computer 33. The measured vibration signal is transmitted to the computer 33, which generates a corresponding control signal through an active control algorithm. This signal is then input to the motion control card 32, output by the D / A output module, transmitted through the terminal board 31 to the piezoelectric amplifier circuit 30, and then input to the electromagnetic energy conversion circuit 28, thereby suppressing the vibration of the flexible beam.

[0059] Please refer to Figures 1 and 6. The coil 22 is wound on the coil support 23 and is fastened to the "inverted L-shaped" rigid support beam 21 by bolts. The "inverted L-shaped" rigid support beam 21 is assembled from two rigid beams fastened by bolts. Its bottom is connected to the right-angle bracket 2 and fastened to the rigid support beam base 20 by screws. The rigid support beam base 20 is fastened to the experimental table 19 by bolts. The coil support 23 is made of insulating material. The two ends of the coil 22 are connected to the electromagnetic energy conversion circuit 28.

[0060] The two ends of the coil 22 are connected to the electromagnetic energy conversion circuit 28. An elongated guide rod 24 is fixed in the central support 4 of the middle layer, and a magnet is fixed at its top. The elongated guide rod 24 passes through the central support 4 of the upper flexible beam coupling body, so that the movement of the magnet can be kept in the center of the coil 22. The bottom of the coil support 23 is a slide rail, which can make the movement of the elongated guide rod 24 coaxial with the coil 22. The coil support 23 is located 85mm above the center of the multi-layer shock absorption structure.

[0061] When the multi-flexible body vibration damping structure vibrates, the upper flexible beam coupled to the main body and the second flexible beam 9 of the lower flexible beam coupled to the main body will cause the central support 4 to move up and down. The central supports 4 of each layer are coupled through coupling springs 7. The central support 4 of the middle body will drive the extension guide rod 24 to move up and down, thereby causing the magnet to move up and down coaxially in the coil 22. During the control process, after receiving the control signal, the electromagnetic energy conversion circuit 28 will generate a corresponding control current input to the coil 22. The coil 22 generates a magnetic field under the action of the current, which actively controls the magnet that is moving up and down coaxially, thereby achieving the purpose of suppressing the vibration of the horizontally placed second flexible beam 9 in the upper and lower flexible beam coupled bodies.

[0062] The measured vibration signal is transmitted to the computer 33, and the corresponding control signal is generated by running the active control algorithm. It is then input into the motion control card 32, output by the D / A output module, transmitted through the terminal board 31 to the piezoelectric amplifier circuit 30, and output to the piezoelectric driver 26, thereby suppressing the vibration of the flexible beam.

[0063] The piezoelectric actuators 26 are placed on the fixed end of the first flexible beam 1 near the vertex support 3. Four piezoelectric actuators 26 are placed on each first flexible beam 1, two on each side. They are symmetrical about the center with respect to the width direction of the flexible beam, 60 mm from the edge of the fixed end, with an orientation of 90°, and 25 mm from the edge of the length direction of the flexible beam. They are used to suppress the bending vibration of the vertically placed first flexible beam 1.

[0064] The piezoelectric actuator 26 is made of piezoelectric ceramic material, and its geometric dimensions are all... The elastic modulus of piezoelectric ceramics is , .

[0065] In this embodiment, the first flexible beam 1 and the second flexible beam 9 are made of the same material, both being thin sheets of epoxy resin. The dimensions of the first flexible beam 1 are 900mm × 150mm × 5mm, and the dimensions of the second flexible beam 9 are 372mm × 150mm × 5mm. The elastic modulus of the epoxy resin is... The density is .

[0066] Linear bearing 13 uses JAE linear bearing LM40UU, with 6 ball rows, a weight of 585g, an inner diameter of 40mm, an outer diameter of 60mm, and a length of 80mm.

[0067] The exciter 17 is a Modal Exciter Type 4826 from HBK Bruel & Kjaer, with a main resonant frequency of 4000Hz, an effective frequency range of 2-5000Hz, an operating frequency range of DC-5000Hz, and a maximum rated stroke of 25.4mm.

[0068] The experimental table 19 is assembled from two aluminum profiles with lengths of 5640mm and 800mm respectively. The tabletop is a 6120mm×4560mm stainless steel plate, which is connected to the profiles by screws. Each connection of the profiles is fixed with angle iron.

[0069] The "inverted L-shaped" rigid support beam 21 consists of two steel plates. The vertically placed steel plate measures 4880mm×150mm×5mm, and the horizontally placed steel plate measures 2920mm×150mm×5mm.

[0070] Copper wire with a diameter of 8mm is used in coil 22 and is wrapped around coil support 23. Coil support 23 is made of insulated steel to prevent current loss in coil 22.

[0071] The charge amplifier 29 is a YE5850 model from Jiangsu Lianeng Electronics Co., Ltd. The motion control card 32 is a DMC-2x digital motion controller manufactured by Galil Systems, Inc. (USA), providing a standard PCI bus interface. The selected computer 33 has a Core 7 6650U 22.2GHz CPU, 4GB of memory, and a PCI-e slot on the motherboard for installing the motion control card 32.

[0072] The piezoelectric amplifier circuit 30 can be an APEX-PA241DW or APEX-PA240CX model piezoelectric amplifier with a magnification factor of 52 times, that is, amplifying -5V~+5V to -260V~+260V.

[0073] In summary, the present invention has the following advantages and beneficial effects:

[0074] 1. This invention studies a vibration measurement and control method for multi-flexible body damping structures. The multi-flexible body damping structure contains both horizontally and vertically placed flexible beams. Compared with other research devices, it can better study the vibration control of horizontally and vertically placed flexible beam damping structures at the same time.

[0075] 2. This invention uses an electromagnetic energy conversion section to control the vibration displacement of a horizontally placed flexible beam connected to the central support of the middle layer. Compared with other controllers, it has a high energy conversion rate and high sensitivity. The electromagnetic energy conversion section uses the magnetic field generated by the current in the coil to interact with the magnetic field generated by the magnet coupled to the vibrating flexible beam, thereby achieving vibration suppression.

[0076] 3. This invention uses a reasonable mechanical design to connect springs to each layer and generates magnetic damping through electric current, to study the vibration characteristics of a multi-flexible damping structure with spring coupling and magnetic damping.

[0077] 4. This invention uses an accelerometer to detect the vibration signal of a horizontal flexible beam coupled to a central support. Compared with other sensors, it has the advantages of convenient installation, good dynamic performance, good linearity, and simple structure, and can perform more accurate measurement of the motion of the flexible beam.

[0078] 5. This invention employs multi-sensor measurement, including both accelerometers and piezoelectric sensors, which helps to improve the breadth and accuracy of the measurement. By fusing multiple sensors, the bending modes of the flexible coupled beam structure are identified and studied.

[0079] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit disclosed in the present invention should fall within the patent scope covered by the present invention.

Claims

1. A vibration monitoring and control device for a multi-flexible body coupled damping structure, characterized in that, include: The system comprises a flexible body vibration damping structure, a vibration detection section, an electromagnetic energy conversion section, a vibration excitation section, and a drive control section. The multi-flexible body damping structure includes an upper flexible beam coupling body, a middle body, and a lower flexible beam coupling body. A top support plate is connected to the upper flexible beam coupling body, and a bottom support plate is connected to the lower flexible beam coupling body. The middle body is connected to both the upper and lower flexible beam coupling bodies. The upper and lower flexible beam coupling bodies each include a first flexible beam, a vertex support, a right-angle support, a center support, a second flexible beam, and a square support. The vertex support and the square support are connected to the vertically placed first flexible beam via the right-angle support, and the center support and the square support are connected to the horizontally placed second flexible beam via the right-angle support. The square brackets are connected to the right-angle brackets respectively. The apex brackets are connected to the top or bottom support plate respectively via connecting rods. The center bracket is connected to the top or bottom support plate respectively via coupling springs. The middle layer body includes apex brackets, right-angle brackets, center brackets, rigid beams, and fixed springs. The apex brackets are connected to each other via right-angle brackets and rigid beams. The apex brackets are connected to the right-angle brackets, and the right-angle brackets are connected to the rigid beams. The center brackets are connected to the apex brackets via fixed springs. The apex brackets are connected to the apex brackets of the upper and lower flexible beam coupling bodies respectively via connecting rods. The center brackets are connected to the center brackets of the upper and lower flexible beam coupling bodies respectively via coupling springs. The vibration detection section includes an accelerometer and a piezoelectric sensor. The accelerometer is mounted on the central support of each layer, and the piezoelectric sensor is mounted on the first flexible beam. The vibration excitation section includes a vibrator, a support rod, a linear bearing, and a support spring. One end of the support rod is fixed to the experimental platform, and the other end passes through the linear bearing and is fixed to the bottom support plate. The support spring is located between the support rod and the linear bearing. The vibrator is fixed to the experimental platform and located below the bottom support plate. The vibrator is connected to the bottom support plate via a top rod. The electromagnetic energy conversion section includes a rigid support beam, a coil, and an extension rod. The coil is wound around a coil support. One end of the rigid support beam is fixed to the experimental platform, and the other end of the rigid support beam is connected to the coil support. The coil is coaxial with the central support, the bottom end of the extended guide rod is connected to the central support of the middle layer, the extended guide rod passes through the central support of the upper layer and the top support plate, and the top end of the extended guide rod enters the coil support and connects with the magnet; the drive control part includes a piezoelectric actuator, an electromagnetic energy conversion circuit, a charge amplifier, a piezoelectric amplifier circuit, a terminal board, a motion control card and a computer. The piezoelectric actuator is set on the first flexible beam, the two ends of the electromagnetic energy conversion circuit are connected to the coil, the charge amplifier is connected to the acceleration sensor and the piezoelectric sensor respectively, the piezoelectric amplifier circuit is connected to the piezoelectric actuator, the electromagnetic energy conversion circuit, the charge amplifier, the piezoelectric amplifier circuit and the motion control card are respectively connected to the terminal board, and the computer is connected to the motion control card.

2. The vibration monitoring and control device for a multi-flexible body coupled vibration reduction structure according to claim 1, characterized in that, The upper-level vertex support is connected to the top support plate via three connecting rods. The middle-level vertex support is connected to the upper and lower-level vertex supports via three connecting rods. The lower-level vertex support is connected to the bottom support plate via three connecting rods.

3. The vibration monitoring and control device for a multi-flexible body coupled vibration reduction structure according to claim 1, characterized in that, The vibration excitation part includes three support guide rods, three linear bearings, and three support springs. The three linear bearings are respectively located at the three vertices of the bottom support plate, and the three support guide rods pass through the three linear bearings respectively.

4. The vibration monitoring and control device for a multi-flexible body coupled vibration reduction structure according to claim 1, characterized in that, The rigid support beam is composed of two support beams that are vertically hinged together, and one end of the rigid support beam is fixed to the experimental table through the rigid support beam base.

5. The vibration monitoring and control device for a multi-flexible body coupled vibration reduction structure according to claim 1, characterized in that, The coil support is 85mm away from the center support of the upper flexible beam coupling body.

6. The vibration monitoring and control device for a multi-flexible body coupled vibration reduction structure according to claim 1, characterized in that, The coil uses copper wire with a diameter of 8mm, and the coil support is made of insulated steel material.

7. The vibration monitoring and control device for a multi-flexible body coupled vibration reduction structure according to claim 1, characterized in that, The piezoelectric sensor is a piezoelectric ceramic sheet, and it is positioned on the centerline of the width direction of the first flexible beam, 100mm away from the edge of the support near the top.

8. The vibration monitoring and control device for a multi-flexible body coupled vibration reduction structure according to claim 1, characterized in that, The piezoelectric actuators are located at the fixed end of the first flexible beam near the top support. Each first flexible beam is equipped with 4 piezoelectric actuators, which are symmetrically installed on both sides. Two piezoelectric actuators on the same end face are connected in parallel and are symmetrical about the centerline of the width direction of the flexible beam.

9. The vibration monitoring and control device for a multi-flexible body coupled vibration reduction structure according to claim 8, characterized in that, The piezoelectric actuator is positioned 60 mm from the fixed end of the first flexible beam near the top support, with an attitude angle of 90°, and 25 mm from the edge of the first flexible beam along its length.

10. A vibration monitoring and control method for a multi-flexible body coupled vibration reduction structure, applied to the vibration monitoring and control device for the multi-flexible body coupled vibration reduction structure as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1: The computer-controlled vibrator is used to excite the vibration and execute the preset desired trajectory, thereby exciting the multi-flexible body damping structure to generate corresponding vibration signals. S2: The vibration of the first flexible beam is detected using a piezoelectric sensor to obtain the vibration signal of the first flexible beam. The vibration of the central support and the second flexible beam is detected using an accelerometer to obtain the vibration signals of the central support and the second flexible beam. S3: The vibration signals of the first flexible beam, the central support, and the second flexible beam are processed by charge amplifiers and then transmitted to the motion control card through the terminal board. The motion control card converts the analog signals into digital signals and then transmits them to the computer. S4: The vibration signals are processed by the computer to obtain corresponding vibration feedback signals. These signals are then output to the piezoelectric amplifier circuit and the electromagnetic energy conversion circuit through the motion control card and the terminal board. The vibration of the flexible beam is suppressed by the piezoelectric driver and the electromagnetic energy conversion part.

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