Six-degree-of-freedom precise instrument vibration isolation platform based on semi-active and active mixing principle
By combining the semi-active and active hybrid principles of magnetostrictive materials and magnetorheological materials, a vibration isolation platform for six-degree-of-freedom precision instruments is realized, which solves the problems of high-frequency instability of active vibration isolation and frequency limitation of passive vibration isolation, and improves the vibration isolation effect and energy efficiency.
Patent Information
- Application Number
- CN202423144516.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-12-19
AI Technical Summary
In the existing technology, active vibration isolation has high control accuracy but unstable high-frequency performance, and passive vibration isolation has limitations in isolation frequency, making it difficult to effectively isolate vibration in a changeable and complex vibration environment.
A six-degree-of-freedom precision instrument vibration isolation platform based on semi-active and active hybrid principles is adopted, combined with magnetostrictive material actuators and magnetorheological materials. Through the cooperation of permanent magnets and excitation coils, the magnetic flux and stiffness of the vibration isolation cushion are adjusted in real time to achieve six-degree-of-freedom control and make up for the defects of active vibration isolation and passive vibration isolation.
It achieves effective vibration isolation of six degrees of freedom in a variable vibration environment, reduces energy consumption and controls costs, and improves the stability and adaptability of vibration isolation.
Smart Images
Figure CN223399155U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of vibration isolation devices, and particularly relates to a six-degree-of-freedom precision instrument vibration isolation platform based on a semi-active and active hybrid principle. Background Art
[0002] Conventional technology typically relies on vibration isolation to protect small, critical items like precision equipment. This technology aims to isolate the object from ground vibrations, using a flexible layer between the object and the underlying vibrating structure. Vibration isolation is categorized as active, passive, and semi-active. Active isolation offers high control accuracy but suffers from unstable high-frequency performance. Passive isolation, due to its fixed parameters, inevitably has frequency limitations.
[0003] This device is based on principles similar to rubber vibration isolation bearings, incorporating MRE materials to adjust the bearing's stiffness. This, combined with the properties of active vibration isolation, allows for control of all six degrees of freedom. When the structure is connected to a power source during an earthquake, the current in the excitation coil is adjusted to control the magnetic field generated by the excitation coil, thereby adjusting the magnetic flux of the magnetorheological material, thereby separately controlling the extrusion and shear stiffnesses, achieving a three-dimensional vibration isolation effect. This device utilizes a hybrid of active and semi-active approaches, addressing the limitations of each, resulting in superior performance in varying and replicated vibration conditions. Utility Model Content
[0004] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a six-degree-of-freedom precision instrument vibration isolation platform based on a semi-active and active hybrid principle.
[0005] The technical solution adopted by this utility model is:
[0006] A six-degree-of-freedom precision instrument vibration isolation platform based on a semi-active and active hybrid principle includes a base plate, a vibration isolation pad connected to the base plate, the material of the vibration isolation pad is MRE material, a first vibration isolation platform is connected to the vibration isolation pad, a second vibration isolation platform is arranged above the first vibration isolation platform, and a plurality of magnetostrictive material actuators are connected between the first and second vibration isolation platforms.
[0007] The utility model adopts a vibration isolation pad and a magnetostrictive material actuator as the main structure. Under the action of the permanent magnet and the excitation coil, the magnetostrictive material actuator between the first and second vibration isolation platforms can realize vertical vibration isolation and rotation control of the second vibration isolation platform.
[0008] This new device, based on principles similar to rubber vibration isolation bearings, incorporates an MRE material isolation pad to adjust the bearing's stiffness. This new device incorporates the characteristics of active vibration isolation, enabling control of all six degrees of freedom. When the structure is connected to a power source during an earthquake, the magnetic field is controlled to adjust the magnetic flux of the magnetorheological elastic material in the isolation pad, thereby controlling its compression and shear stiffness, achieving a three-dimensional vibration isolation effect. This device utilizes a hybrid of active and semi-active technologies, addressing the deficiencies of each, resulting in superior performance in variable and replicated vibration processes.
[0009] As a preferred solution of the present invention, there are four magnetostrictive material actuators between the first and second vibration isolation platforms, and the four magnetostrictive material actuators are respectively arranged at the four corners on the lower side of the second vibration isolation platform.
[0010] As a preferred solution of the present invention, a plurality of rigid connection columns are connected to one side of the bottom plate facing the first vibration isolation platform, and a gap is left between the other end of the rigid connection column and the first vibration isolation platform.
[0011] As a preferred embodiment of the present invention, an excitation coil is wound around the rigid post. When the structure is connected to a power source during an earthquake, the current in the excitation coil is adjusted to control the magnetic field generated by the excitation coil, thereby adjusting the magnetic flux of the magnetorheological material, thereby controlling its compression stiffness and shear stiffness, respectively, to achieve a three-dimensional vibration isolation effect.
[0012] As a preferred solution of the present invention, there are four rigid connection columns on the base plate, and the four rigid connection columns are respectively arranged at the four corners on the upper side of the base plate.
[0013] As a preferred solution of the present invention, a plurality of baffles are connected to the edge of the first vibration isolation platform, and the top surface height of the baffles exceeds the lower side of the second vibration isolation platform.
[0014] As a preferred solution of the present invention, a magnetostrictive material actuator is connected between the baffle and the second vibration isolation platform. By connecting the magnetostrictive material actuator between the baffle and the second vibration isolation platform, the left and rear sides also have the same vibration isolation effect.
[0015] As a preferred solution of the present invention, there are two magnetostrictive material actuators connected between the baffle and the second vibration isolation platform.
[0016] As a preferred solution of the present invention, there are two baffles connected to the edge of the first vibration isolation platform, and the two baffles are respectively arranged on the left side and the rear side of the first vibration isolation platform.
[0017] As a preferred embodiment of the present invention, permanent magnets are embedded within both the first isolation platform and the base plate. Under the action of the permanent magnets and the excitation coil, the magnetostrictive material actuator between the first and second isolation platforms can achieve vertical vibration isolation and rotational control of the second isolation platform.
[0018] The vibration isolation pad increases in stiffness as the magnetic flux generated by the excitation coil increases. To ensure its stability, it must be constantly energized, which wastes energy. Therefore, this device uses two permanent magnets, one above the other, to generate an initial magnetic flux, giving the isolation pad an initial high stiffness. Subsequently, the coil is energized to generate an opposing magnetic field to offset the initial magnetic flux. This achieves the effect of increasing the current and decreasing the stiffness of the isolation support during an earthquake. This method has low energy consumption and low control costs.
[0019] The beneficial effects of the utility model are:
[0020] 1. The utility model has a simple structure and is easy and quick to install. The weight of a single supporting plate is relatively lighter, and the transportation process is more labor-saving, time-saving and relatively safe.
[0021] 2. The utility model adopts a vibration isolation pad and a magnetostrictive material actuator as the main structure. Under the action of the permanent magnet and the excitation coil, the magnetostrictive material actuator between the first and second vibration isolation platforms can achieve vertical vibration isolation and rotation control of the second vibration isolation platform.
[0022] 3. The magnetorheological elastomer (MRE) material in the vibration isolation pad increases in stiffness as the magnetic flux generated by the excitation coil increases. To ensure its stability, it must be constantly energized, which wastes energy. Therefore, this device uses two permanent magnets, one above the other, to generate an initial magnetic flux, giving the MRE material in the vibration isolation pad an initial high stiffness. Subsequently, the excitation coil is energized to generate an opposing magnetic field to offset the initial magnetic flux. This achieves the effect of increasing current and decreasing stiffness in the vibration isolation support during an earthquake. This method has low energy consumption and low control costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a structural diagram of the utility model;
[0024] Figure 2 It is the main view of the present utility model.
[0025] In the figure: 1-second layer vibration isolation platform; 2-magnetostrictive material actuator; 3-first layer vibration isolation platform; 4-baffle; 5-vibration isolation pad; 6-bottom plate; 7-rigid column. DETAILED DESCRIPTION
[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.
[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without inventive effort are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features therein may be combined with each other unless there is a conflict.
[0028] like Figure 1 and Figure 2 As shown, the six-degree-of-freedom precision instrument vibration isolation platform based on the semi-active and active hybrid principle of this embodiment includes a base plate 6, to which is connected a vibration isolation pad 5 made of MRE material. A first-layer vibration isolation platform 3 is connected to the vibration isolation pad 5, and a second-layer vibration isolation platform 1 is disposed above the first-layer vibration isolation platform 3. Several magnetostrictive material actuators 2 are connected between the first and second-layer vibration isolation platforms 3 and 1. Several rigid posts 7 are connected to the side of the base plate 6 facing the first-layer vibration isolation platform 3, with a gap between the other ends of the rigid posts 7 and the first-layer vibration isolation platform 3. Excitation coils are wound around the rigid posts 7. Permanent magnets are embedded within both the first-layer vibration isolation platform 3 and the base plate 6.
[0029] The edge of the first-layer vibration isolation platform 3 is connected to several baffles 4, the top surface height of which exceeds the lower side of the second-layer vibration isolation platform 1. A magnetostrictive material actuator 2 is connected between the baffles 4 and the second-layer vibration isolation platform 1. By connecting the magnetostrictive material actuator 2 between the baffles 4 and the second-layer vibration isolation platform 1, the utility model achieves the same vibration isolation effect on the left and rear sides. Two magnetostrictive material actuators 2 are connected between the baffles 4 and the second-layer vibration isolation platform 1. Two baffles 4 are connected to the edge of the first-layer vibration isolation platform 3, one on the left and one on the rear sides of the first-layer vibration isolation platform 3.
[0030] Specifically, the vibration isolation pad 5 is a magnetorheological elastomer (MRE), a smart material whose stiffness can be adjusted by adjusting the strength of the external magnetic field. Electric current is connected to four excitation coils to generate a magnetic field. By varying the current intensity, the magnetic flux of the MRE material can be adjusted in real time, controlling the stiffness of the MRE to avoid the resonance peak caused by the dominant vibration frequency, achieving the first level of semi-active vibration isolation.
[0031] The magnetostrictive material actuator 2 is a smart material sensitive to external magnetic fields, its length change controlled by adjusting the magnetic field. This material is commonly used to achieve fine-tuning and precise structural deformation. The rotating portion of the device utilizes four magnetostrictive actuators, which are distributed in the four vertical directions of the platform. Each actuator has a different length of extension and contraction. This design allows each actuator to adjust its length independently. Through the synergistic combination of different length extensions, the platform's rotational control is achieved. Combined with the four horizontal actuators, a second level of six-degree-of-freedom active control is achieved.
[0032] In the hybrid vibration isolation device, the magnetostrictive material actuator 2 is regarded as the core component of active vibration reduction, which is specifically used to suppress the vibration of the vibration isolation platform in low-frequency disturbances. Its design aims to effectively reduce the impact of low-frequency vibrations, so that the device has excellent active vibration isolation performance in this frequency range. At the same time, the vibration isolation pad 5 is introduced, and the vibration isolation pad 5 is a magnetorheological elastomer (MRE) isolator, which is used to achieve passive vibration reduction in high-frequency disturbances. This elastomer has magnetorheological properties and can quickly adjust its stiffness under high-frequency vibrations, thereby effectively suppressing high-frequency vibrations. By combining these two vibration isolation methods, a semi-active / active hybrid vibration isolation system of a series vibration isolation platform is realized, so that the entire device exhibits excellent vibration isolation performance in a wider frequency range.
[0033] The utility model adopts a vibration isolation pad 5 and a magnetostrictive material actuator 2 as the main structure. Under the action of the permanent magnet and the excitation coil, the magnetostrictive material actuator 2 between the first vibration isolation platform 3 and the second vibration isolation platform 1 can achieve vertical vibration isolation and rotation control of the second vibration isolation platform 1.
[0034] The vibration isolation pad 5 increases in stiffness as the magnetic flux generated by the excitation coil increases. To ensure its stability, it must be constantly powered, which wastes energy. Therefore, this device uses two permanent magnets, one above the other, to generate an initial magnetic flux, giving the isolation pad 5 an initial high stiffness. Subsequently, the coil is energized to generate an opposing magnetic field to offset the initial magnetic flux. This achieves the effect of increasing the current and decreasing the stiffness of the isolation support during an earthquake. This method has low energy consumption and low control costs.
[0035] This utility model is based on principles similar to rubber vibration isolation bearings. It incorporates an MRE material isolation pad 5 to adjust the stiffness of the isolation bearing. This, combined with the characteristics of active vibration isolation, allows for control of all six degrees of freedom. Under earthquake action, the structure is connected to a power source. By adjusting the current in the excitation coil, the magnetic field generated by the excitation coil is controlled, and the magnetic flux of the magnetorheological material is adjusted, thereby controlling its extrusion stiffness and shear stiffness, achieving a three-dimensional vibration isolation effect. This device utilizes a hybrid of active and semi-active methods, addressing the shortcomings of each, resulting in a superior effect in variable and replicated vibration processes.
[0036] Specifically, there are four magnetostrictive material actuators 2 between the first vibration isolation platform 3 and the second vibration isolation platform 1, and the four magnetostrictive material actuators 2 are respectively arranged at the four corners on the lower side of the second vibration isolation platform 1. There are four rigid connection posts 7 on the bottom plate 6, and the four rigid connection posts 7 are respectively arranged at the four corners on the upper side of the bottom plate 6.
[0037] The present invention is not limited to the above-mentioned optional implementation methods. Anyone can derive various other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that falls within the scope defined by the claims of the present invention shall fall within the scope of protection of the present invention.
Claims
1. A six-degree-of-freedom precision instrument vibration isolation platform based on a semi-active and active hybrid principle, characterized by: The invention comprises a bottom plate (6), a vibration isolation pad (5) is connected to the bottom plate (6), the material of the vibration isolation pad (5) is an MRE material, a first vibration isolation platform (3) is connected to the vibration isolation pad (5), a second vibration isolation platform (1) is arranged above the first vibration isolation platform (3), and a plurality of magnetostrictive material actuators (2) are connected between the first vibration isolation platform (3) and the second vibration isolation platform (1).
2. The six-degree-of-freedom precision instrument vibration isolation platform based on the semi-active and active hybrid principle according to claim 1, characterized in that: There are four magnetostrictive material actuators (2) between the first vibration isolation platform (3) and the second vibration isolation platform (1), and the four magnetostrictive material actuators (2) are respectively arranged at the four corners on the lower side of the second vibration isolation platform (1).
3. The six-degree-of-freedom precision instrument vibration isolation platform based on the semi-active and active hybrid principle according to claim 1 is characterized by: A plurality of rigid connection columns (7) are connected to one side of the bottom plate (6) facing the first vibration isolation platform (3), and a gap is left between the other end of the rigid connection column (7) and the first vibration isolation platform (3).
4. The six-degree-of-freedom precision instrument vibration isolation platform based on the semi-active and active hybrid principle according to claim 3, characterized in that: An excitation coil is wound around the rigid connection column (7).
5. The six-degree-of-freedom precision instrument vibration isolation platform based on the semi-active and active hybrid principle according to claim 3 is characterized by: There are four rigid connection columns (7) on the bottom plate (6), and the four rigid connection columns (7) are respectively arranged at the four corners on the upper side of the bottom plate (6).
6. The six-degree-of-freedom precision instrument vibration isolation platform based on the semi-active and active hybrid principle according to claim 1, characterized in that: The edge of the first-layer vibration isolation platform (3) is connected to a plurality of baffles (4), and the top surface height of the baffles (4) exceeds the lower side of the second-layer vibration isolation platform (1).
7. The six-degree-of-freedom precision instrument vibration isolation platform based on the semi-active and active hybrid principle according to claim 6, characterized in that: A magnetostrictive material actuator (2) is connected between the baffle (4) and the second-layer vibration isolation platform (1).
8. The six-degree-of-freedom precision instrument vibration isolation platform based on the semi-active and active hybrid principle according to claim 7, characterized in that: There are two magnetostrictive material actuators (2) connected between the baffle (4) and the second-layer vibration isolation platform (1).
9. The six-degree-of-freedom precision instrument vibration isolation platform based on the semi-active and active hybrid principle according to claim 6, characterized in that: There are two baffles (4) connected to the edge of the first vibration isolation platform (3), and the two baffles (4) are respectively arranged on the left side and the rear side of the first vibration isolation platform (3).
10. A six-degree-of-freedom precision instrument vibration isolation platform based on a semi-active and active hybrid principle according to any one of claims 1 to 9, characterized in that: Permanent magnets are embedded in the first-layer vibration isolation platform (3) and the bottom plate (6).