Semi-active vibration isolation and isolation device

Abstract

The application relates to a semi-active vibration isolation and isolation device, which comprises a piezoelectric layer, an energy storage layer, a solenoid, electrodes, an oscillator, a permanent magnet and a hydraulic rod. The piezoelectric layer is divided into upper and lower layers and arranged at the top and bottom of the vibration isolation device respectively. The energy storage layer, the oscillator, the solenoid and the hydraulic rod are arranged between the upper and lower piezoelectric layers. The energy storage layer is connected with the piezoelectric layer. The permanent magnet is arranged between the energy storage layer and the oscillator. The hydraulic rod penetrates the oscillator and the permanent magnet and is fixedly connected with the energy storage layer. The solenoid is wound around the oscillator. The two ends of the solenoid are electrically connected with the piezoelectric layer through the electrodes. An acceleration sensor is arranged in the middle of the piezoelectric layer of the vibration isolation device, which is used for monitoring the vibration of the device in real time. The measured acceleration is transmitted to a control system, which is used for controlling the operation of the device. According to the degree of vibration, the device can be efficiently isolated and vibrated in three working conditions.

Description

Technical Field

[0001] This invention relates to the field of vibration control technology, specifically to a semi-active vibration damping and isolation device. Background Technology

[0002] Civil engineering structures and mechanical structures often encounter vibration problems, which can lead to serious consequences. Therefore, vibration control can be achieved using vibration reduction and isolation structures. However, conventional vibration reduction and isolation devices have limitations, including a limited range of vibration reduction capabilities, high energy consumption, the need for manual adjustment of the devices based on vibration conditions, and short lifespan due to their significant energy dissipation.

[0003] Therefore, there is an urgent need for a vibration isolation device that can intelligently control and reduce the wear and tear of the vibration device itself, so as to adapt to various vibration situations. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a semi-active vibration damping and isolation device, including a piezoelectric layer, an energy storage layer, a solenoid, an electrode, an oscillator, a permanent magnet, and a hydraulic rod. The piezoelectric layer is divided into upper and lower layers, which are respectively disposed at the top and bottom of the vibration isolation device. The energy storage layer, oscillator, solenoid, and hydraulic rod are disposed between the upper and lower piezoelectric layers. The energy storage layer is connected to the piezoelectric layer. A permanent magnet is disposed between the energy storage layer and the oscillator. The hydraulic rod passes through the oscillator and the permanent magnet and is fixedly connected to the energy storage layer. The solenoid is wound around the oscillator, and the two ends of the solenoid are electrically connected to the piezoelectric layer through the electrode.

[0005] Furthermore, the energy storage layer is divided into upper and lower layers, which are fixedly connected to the upper and lower layers of the piezoelectric layer, respectively. Electrodes are fixedly disposed on both the upper and lower piezoelectric layers. One end of the electrode is fixedly connected to the piezoelectric layer, and the other end extends out of the energy storage layer and is connected to the solenoid.

[0006] Furthermore, the permanent magnets are arranged in pairs, divided into a first permanent magnet group and a second permanent magnet group. The first permanent magnet group is composed of two first permanent magnets, which are respectively fixed to the lower end of the upper energy storage layer and the upper end of the lower energy storage layer; the second permanent magnet group is composed of two second permanent magnets, which are respectively fixed to the upper end and the lower end of the oscillator.

[0007] Furthermore, an acceleration sensor is provided in the upper piezoelectric layer to measure the acceleration during the vibration process of the vibration isolation device.

[0008] Furthermore, a control system is also provided in the upper energy storage layer. The acceleration measured by the acceleration sensor is transmitted to the control system, which is used to control the operation of the vibration isolation device.

[0009] Furthermore, an acceleration range is preset in the control system, which can be divided into three vibration conditions according to the vibration degree of the vibration isolation device: Operating Condition 1: The vibration acceleration is less than the lower limit of the preset vibration acceleration range; Condition 2: The vibration acceleration is within the preset vibration acceleration range; Condition 3: The vibration acceleration is greater than the upper limit of the preset vibration acceleration range.

[0010] Furthermore, the oscillator is divided into multiple layers, each layer being filled with one-half to two-thirds of oscillating particles.

[0011] Furthermore, the material of the piezoelectric layer can be selected from silicate piezoelectric materials such as zirconium dioxide and silicon dioxide; ferroelectric piezoelectric materials such as titanium dioxide and barium titanate; piezoelectric ceramic materials such as lead zirconate titanate and titanium zincate; organic piezoelectric materials such as polyvinylidene fluoride, polyethylene vinylidene fluoride copolymer, and polyacetylene; or composite piezoelectric materials that combine inorganic and organic piezoelectric materials, such as piezoelectric ceramic-PVDF composite piezoelectric materials.

[0012] Furthermore, the oscillating particles inside the oscillator can be made of different materials, such as polyurethane, polycarbonate, graphite, and metal, depending on the usage environment.

[0013] Furthermore, the energy storage layer is made of electrochemical energy storage materials such as lead-acid batteries, lithium-ion batteries, sodium-ion batteries, lead-carbon batteries, and flow batteries.

[0014] Furthermore, the solenoid can be made of metal materials such as soft iron, ferrosilicon, copper, and nickel.

[0015] The present invention has the following beneficial effects: 1. The vibration isolation device of the present invention incorporates a control system, which can control the device according to the vibration state, making the device more intelligent and efficient.

[0016] 2. The permanent magnet of the vibration isolation device of the present invention can realize a negative stiffness element, which together with the positive stiffness element formed by the hydraulic rod can realize quasi-zero stiffness, so that the device can realize the function of "high static and low dynamic", and at the same time has high static load support capacity and low frequency vibration isolation performance.

[0017] 3. The vibration isolation device of the present invention is divided into three working conditions according to different vibration levels, and the energy consumption mechanism of different working conditions is different, so that the vibration isolation device has the function of graded energy consumption. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a semi-active vibration damping and isolation device according to the present invention; Figure 2 This is a schematic diagram of the internal structure of the oscillator of a semi-active vibration damping and isolation device according to the present invention.

[0019] Among them: piezoelectric layer-1; energy storage layer-2; solenoid-3; electrode-4; oscillator-5; first permanent magnet-6; hydraulic rod-7; acceleration sensor-8; control system-9; second permanent magnet-10. Detailed Implementation

[0020] The semi-active vibration damping and isolation device of the present invention will be further described in detail below with reference to the accompanying drawings. The semi-active vibration damping and isolation device provided by the present invention uses an acceleration sensor 8 to monitor the vibration degree of the vibration isolation device without any external human intervention, and adjusts the function of the internal components through the control system 9 to cope with different degrees of external force.

[0021] According to the appendix Figure 1 As shown in the figure and embodiments of the present invention, a semi-active vibration damping and isolation device includes a piezoelectric layer 1, an energy storage layer 2, a solenoid 3, an electrode 4, an oscillator 5, a permanent magnet, a hydraulic rod 7, an accelerometer 8, and a control system 9. The piezoelectric layer 1 is divided into upper and lower layers, respectively disposed at the top and bottom of the vibration isolation device. The energy storage layer 2, oscillator 5, solenoid 3, and hydraulic rod 7 are disposed between the upper and lower piezoelectric layers. The energy storage layer 2 is fixedly connected to the piezoelectric layer 1. A permanent magnet is disposed between the energy storage layer 1 and the oscillator 5. The hydraulic rod 7 passes through the oscillator 5 and the permanent magnet and is fixedly connected to the energy storage layer 2. The solenoid 3 is wound around the oscillator 5, and its two ends are electrically connected to the piezoelectric layer 1 through the electrode 4. The accelerometer 8 is disposed in the middle of the upper piezoelectric layer 1. The control system 9 is also disposed in the upper energy storage layer 2, preferably at the edge of the upper energy storage layer 2.

[0022] According to an embodiment of the present invention, the hydraulic rod 7 is a positive stiffness rod, which can both support the overall structure of the device and prevent excessive deformation of the device caused by excessive external force. The oscillator 5 can vibrate up and down along the hydraulic rod 7.

[0023] According to an embodiment of the present invention, the energy storage layer 2 is divided into upper and lower layers, which are fixedly connected to the upper and lower layers of the piezoelectric layer 1, respectively. Electrodes 4 are fixedly disposed on both the upper and lower piezoelectric layers 1. One end of each electrode 4 is fixedly connected to the piezoelectric layer 1, and the other end extends out of the energy storage layer 2 and connects to the solenoid 3. When an external force is applied, the piezoelectric layer 1 generates electricity, which can be introduced into the energy storage layer 2 through the electrode 4.

[0024] According to an embodiment of the present invention, the permanent magnets are arranged in pairs, divided into a first permanent magnet group and a second permanent magnet group. The first permanent magnet group is composed of two first permanent magnets 6, which are respectively fixed to the lower end of the upper energy storage layer 2 and the upper end of the lower energy storage layer 2; the second permanent magnet group is composed of two second permanent magnets 10, which are respectively fixed to the upper end and the lower end of the oscillator 5. The two groups of permanent magnets utilize the principle of like poles repulsion to maintain a certain distance between the oscillator 5 and the energy storage layer 2, while ensuring that the oscillator 5 can reset normally after its operation. In addition, the permanent magnets can generate negative stiffness, while the hydraulic rod 7 generates positive stiffness. The parallel connection of the two can generate quasi-zero stiffness, enabling the vibration isolation device to achieve the function of "high static and low dynamic" while having high static load support capacity and low-frequency vibration isolation performance.

[0025] According to an embodiment of the present invention, the acceleration sensor 8 is used to measure acceleration to characterize the vibration degree of the vibration isolation device. The measured acceleration is transmitted to the control system 9 to control the operation of the vibration isolation device. Three operating conditions are defined based on the different vibration degrees. Under different operating conditions, the vibration reduction and energy dissipation mechanisms of the internal components of the vibration isolation device are not entirely the same, but their ultimate goal is to dissipate the energy caused by external vibration to achieve the effect of vibration reduction and energy dissipation.

[0026] According to an embodiment of the present invention, the oscillator 5 can move up and down along the hydraulic rod 7. The oscillator 5 is internally divided into multiple layers, each layer being filled with one-half to two-thirds of oscillating particles. This serves two purposes: first, to prevent the particles from accumulating due to gravity, which would affect their collision with each other in the magnetic field and thus weaken the vibration damping and energy dissipation effect; and second, to allow for the placement of different types of oscillating particles according to different external environments, thereby increasing the efficiency of vibration damping and energy dissipation. The arrangement of the oscillating particles is as follows: Figure 2 As shown.

[0027] According to embodiments of the present invention, the material of the piezoelectric layer 1 can be a silicate piezoelectric material such as zirconium dioxide or silicon dioxide; a ferroelectric piezoelectric material such as titanium dioxide or barium titanate; a piezoelectric ceramic piezoelectric material such as lead zirconate titanate or titanium zincate; an organic piezoelectric material such as polyvinylidene fluoride (PVDF), polyvinylidene fluoride copolymer (P(VDF-TrFE)), and polyacetylene (PEA); or a composite piezoelectric material that combines inorganic and organic piezoelectric materials, such as a piezoelectric ceramic-PVDF composite piezoelectric material.

[0028] According to an embodiment of the present invention, the oscillating particles inside the oscillator 5 can be made of different materials, such as polyurethane, polycarbonate, graphite and metal, depending on the different usage environments.

[0029] According to an embodiment of the present invention, the energy storage layer 2 is made of electrochemical energy storage materials such as lead-acid batteries, lithium-ion batteries, sodium-ion batteries, lead-carbon batteries, and flow batteries.

[0030] According to an embodiment of the present invention, the solenoid 3 can be made of metal materials such as soft iron, ferrosilicon, copper, and nickel.

[0031] The vibration isolation device of the present invention monitors the degree of vibration of the device using an acceleration sensor 8 without any external human intervention, and adjusts the function of internal components through a control system 9 to cope with different degrees of external force.

[0032] The working principle of the vibration isolation device of the present invention is as follows: When an external force is applied, the piezoelectric layer 1 generates electricity, and at the same time, the acceleration sensor 8 measures the vibration acceleration of the vibration isolation device. The real-time acceleration data is transmitted to the control system 9, which presets a normal vibration acceleration range and divides it into three working conditions according to the different vibration levels: Operating Condition 1: When the vibration acceleration is less than the lower limit of the normal vibration acceleration range, the device vibration is small and insufficient to excite the oscillator 5. The vibration energy is mainly converted into electrical energy by the piezoelectric layer 1 and stored in the energy storage layer 2. In addition, the damping of the hydraulic rod 7 and the vibration isolation device itself can also consume some vibration energy.

[0033] Operating Condition 2: When the vibration acceleration is within the normal vibration acceleration range, the oscillator 5 can be activated, and energy is dissipated through the collisions and friction between the oscillating particles inside and between the oscillating particles and the inner wall of the oscillator 5. At the same time, the current generated by the piezoelectric layer 1 and the current stored in the energy storage layer 2 can flow into the solenoid 3, generating a changing magnetic field, which strengthens the oscillation state of the oscillator 5, thereby making its energy dissipation more complete and effective.

[0034] Operating Condition 3: When the vibration acceleration exceeds the upper limit of the normal vibration acceleration range, the oscillator 5 is activated, and energy is dissipated through collisions and friction between the oscillating particles inside and between the oscillating particles and the inner wall of the oscillator 5. Simultaneously, the current generated by the piezoelectric layer 1 and the current stored in the energy storage layer 2 can flow into the solenoid 3, generating a changing magnetic field that strengthens the oscillation state of the oscillator 5, thus making its energy dissipation more efficient. However, due to the large vibration, the vibration device may not be able to dissipate all the vibration energy; the excess vibration energy is stored in the energy storage layer 2 as electrical energy.

[0035] The preset acceleration range for normal vibration is set based on the industry's regulations on vibration acceleration and then according to the user's needs. The acceleration range settings are all guaranteed to be within a reasonable range in this field.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A semi-active vibration damping and isolation device, characterized in that, The device comprises a piezoelectric layer, an energy storage layer, a solenoid, electrodes, an oscillator, a permanent magnet, and a hydraulic rod. The piezoelectric layer consists of upper and lower layers, respectively located at the top and bottom of the vibration isolation device. The energy storage layer, oscillator, solenoid, and hydraulic rod are positioned between the upper and lower piezoelectric layers. The energy storage layer is connected to the piezoelectric layer, and a permanent magnet is positioned between the energy storage layer and the oscillator. The hydraulic rod passes through the oscillator and the permanent magnet and is fixedly connected to the energy storage layer. The solenoid is wound around the oscillator, and its two ends are electrically connected to the piezoelectric layer via the electrodes. An acceleration sensor is located in the upper piezoelectric layer to measure the acceleration during the vibration of the vibration isolation device. A control system is also located in the upper energy storage layer. The acceleration measured by the acceleration sensor is transmitted to the control system, which controls the operation of the vibration isolation device.

2. The semi-active vibration damping and isolation device according to claim 1, characterized in that, The energy storage layer is divided into upper and lower layers, which are fixedly connected to the upper and lower piezoelectric layers respectively. Electrodes are fixedly arranged on both the upper and lower piezoelectric layers. One end of the electrode is fixedly connected to the piezoelectric layer, and the other end extends out of the energy storage layer and is connected to the solenoid.

3. The semi-active vibration damping and isolation device according to claim 1, characterized in that, The permanent magnets are arranged in pairs, divided into a first permanent magnet group and a second permanent magnet group. The first permanent magnet group is composed of two first permanent magnets, which are fixed to the lower end of the upper energy storage layer and the upper end of the lower energy storage layer, respectively. The second permanent magnet group is composed of two second permanent magnets, which are fixed to the upper end and the lower end of the oscillator, respectively.

4. The semi-active vibration damping and isolation device according to claim 1, characterized in that, The oscillator is divided into multiple layers, each filled with one-half to two-thirds of oscillating particles.

5. The semi-active vibration damping and isolation device according to claim 1, characterized in that, The piezoelectric layer is made of silicate-based piezoelectric materials; ferroelectric piezoelectric materials; piezoelectric ceramic piezoelectric materials; organic piezoelectric materials; or composite piezoelectric materials that combine inorganic and organic piezoelectric materials.

6. The semi-active vibration damping and isolation device according to claim 1, characterized in that, The oscillating particles inside the oscillator are made of different materials depending on the usage environment.

7. The semi-active vibration damping and isolation device according to claim 1, characterized in that, The energy storage layer is made of electrochemical energy storage material.

8. The semi-active vibration damping and isolation device according to claim 1, characterized in that, The solenoid is made of metal.

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