Electrorheological fluid based tunable damper capsule isolation system

Abstract

The application provides a kind of adjustable damping capsule vibration isolation system based on electrorheological fluid, belong to the field of vibration isolation device, comprising: vibration isolation capsule, vibration isolation capsule is filled with electrorheological fluid inside, wherein, electrorheological fluid includes solid particles;Air pressure pump;Conduit;At least part of solid particles in electrorheological fluid moves to conduit under the action of gravity;Air pressure pump is configured to pump gas into conduit based on target gas flow, to deliver target number of solid particles in conduit to the inside of vibration isolation capsule, to change the concentration of solid particles in electrorheological fluid, wherein, electrorheological fluid is configured to use the effect of electrorheological effect on the elastic wave of vibration source for vibration isolation treatment based on the concentration of solid particles.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vibration isolation devices, and more particularly, to an adjustable damping capsule vibration isolation system based on electrorheological fluid. BACKGROUND

[0002] Due to the gradual formation of urbanization, the mileage of rail transit has increased significantly. Rail transit not only facilitates people's travel, but also inevitably brings vibration problems. Vibration brings non-negligible harm to the safety of building structures, the use of precision equipment, and human health. The vibration isolation method is mostly used for ground connection wall and vibration isolation trench. However, the vibration isolation trench has the risk of instability and collapse, and requires a larger vibration isolation site. The ground connection wall not only has a high construction cost, but also has the problem of poor vibration isolation effect and difficulty in effectively isolating elastic waves of different vibration sources.

[0003] Therefore, there is an urgent need for a vibration isolation system with high stability and high efficiency in isolating elastic waves of different vibration sources. SUMMARY

[0004] Therefore, the present application provides an adjustable damping capsule vibration isolation system based on electrorheological fluid.

[0005] One aspect of an embodiment of the present application provides an adjustable damping capsule vibration isolation system based on electrorheological fluid, comprising: a vibration isolation capsule, the vibration isolation capsule being filled with electrorheological fluid inside, wherein the electrorheological fluid comprises solid particles; a gas pump; and a conduit, a first end of the conduit being communicated to the inside of the vibration isolation capsule through an upper surface of the vibration isolation capsule, a second end of the conduit being communicated to the inside of the vibration isolation capsule through a lower surface of the vibration isolation capsule, and a third end of the conduit being connected to the gas pump; wherein at least part of the solid particles in the electrorheological fluid move to the conduit under the action of gravity; the gas pump is configured to pump gas into the conduit based on a target gas flow, so as to use the aerodynamic drag of the gas to transport a target number of solid particles in the conduit to the inside of the vibration isolation capsule through the upper surface, so as to change the concentration of the solid particles in the electrorheological fluid, wherein the electrorheological fluid is configured to use the electrorheological effect to isolate and process elastic waves of a vibration source based on the concentration of the solid particles in the electrorheological fluid.

[0006] According to the embodiment of the present application, the adjustable damping capsule vibration isolation system further comprises: a gas compressor connected to a fourth end of the conduit and configured to control the gas pressure inside the vibration isolation capsule to change the gas-liquid mixing ratio of the gas and the electrorheological fluid, the gas and the electrorheological fluid forming a two-phase system, and the two-phase system being configured to change the stiffness and damping characteristics of the two-phase system based on the gas-liquid mixing ratio.

[0007] According to an embodiment of the present application, the adjustable damping bladder isolation system further comprises: a plurality of electrode housings, the plurality of electrode housings being in series and immersed in the electrorheological fluid, the plurality of electrode housings being configured to generate an electric field under control of the far-infrared control signal, the electric field being configured to change electrical properties of the solid particles based on a polarization effect, the electrorheological fluid being configured to adjust a damping of the electrorheological fluid based on the electrical properties of the solid particles.

[0008] According to an embodiment of the present application, the electrode housing is a porous structure, the electrorheological fluid passing through the electrode housing of the porous structure under the effect of the elastic wave, the porous structure being configured to increase energy dissipation of the elastic wave based on viscosity.

[0009] According to an embodiment of the present application, the adjustable damping bladder isolation system further comprises: a first acceleration sensor, the first acceleration sensor being closer to the vibration source than the isolation bladder, the first acceleration sensor being configured to collect a first acceleration signal of the elastic wave of the vibration source; a second acceleration sensor, the second acceleration sensor being farther away from the vibration source than the isolation bladder, the second acceleration sensor being configured to collect a second acceleration signal of the elastic wave after being processed by the isolation bladder; and a controller, configured to receive the first acceleration signal and the second acceleration signal, and generate the far-infrared control signal based on the first acceleration signal and / or the second acceleration signal.

[0010] According to an embodiment of the present application, the adjustable damping bladder isolation system further comprises: a photoelectric sensor, the photoelectric sensor being fixedly arranged at the first end of the conduit, and configured to measure a number of the solid particles transported to the inside of the isolation bladder via the upper surface based on a light scattering principle, and adjust the target gas flow based on the measurement result.

[0011] According to an embodiment of the present application, the adjustable damping bladder isolation system further comprises: a filtering device, the filtering device being fixedly arranged inside the isolation bladder and located below the electrorheological fluid, and configured to selectively filter out the electrorheological fluid to the conduit.

[0012] According to an embodiment of the present application, the filtering device is a polytetrafluoroethylene microporous membrane, the polytetrafluoroethylene microporous membrane being configured to selectively filter out the solid particles based on hydrophobic and oleophobic properties and a porous structure.

[0013] According to an embodiment of the present application, the adjustable damping bladder isolation system further comprises: a buffering device, the buffering device being fixedly arranged inside the isolation bladder and located above the electrorheological fluid, and configured to disperse the target number of solid particles into the electrorheological fluid, the dispersed target number of solid particles forming a stable suspension in the electrorheological fluid.

[0014] According to an embodiment of the present application, the buffering device is a mechanical stirring propeller, the mechanical stirring propeller being configured to generate rotation based on aerodynamic drag, and disperse the target number of solid particles based on the rotation.

[0015] Through the embodiment of the present application, the circulation arrangement of the solid particles in the vibration isolation capsule can be realized based on the action of the aerodynamic drag and gravity, and the concentration of the solid particles in the electrorheological fluid can be changed by transporting the target number of solid particles into the interior of the vibration isolation capsule. Different concentrations of the solid particles can form electrorheological fluids with different damping and stiffness by utilizing the electrorheological effect, and different stiffness of the electrorheological fluid corresponds to different natural frequency of the electrorheological fluid, and different natural frequency of the electrorheological fluid can isolate the vibration source with different frequency, and different damping of the electrorheological fluid can also effectively isolate the elastic wave with different vibration characteristics based on the different energy dissipation effect, so as to solve the problem that it is difficult to effectively isolate the complex elastic wave of the vibration source, thereby improving the stability and efficiency of the vibration isolation. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other objects, features and advantages of the present application will become more apparent from the following description when taken in conjunction with the accompanying drawings, in which:

[0017] Figure 1 A schematic diagram of the adjustable damping capsule vibration isolation system based on the electrorheological fluid according to an embodiment of the present application is shown;

[0018] Figure 2 A schematic diagram of the adjustable damping capsule vibration isolation system based on the electrorheological fluid according to another embodiment of the present application is shown;

[0019] Figure 3 A schematic diagram of the adjustable damping capsule vibration isolation system based on the electrorheological fluid according to another embodiment of the present application is shown. DETAILED DESCRIPTION

[0020] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. It is to be understood, however, that the description is merely exemplary of the present application, and is not intended to limit the scope of the present application. In the following detailed description of the embodiments of the present application, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that one or more embodiments of the present application can be practiced without these specific details. In other instances, well-known structures and functions have not been described in detail in order to avoid obscuring aspects of the present application.

[0021] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present application. As used herein, the term "including" as well as other forms such as "include", "includes", and "including", are intended to mean the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0022] All terms used herein, including technical and scientific terms, have the meanings commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the use of any terms herein should not be interpreted as excluding the use of any other terms.

[0023] In the case of using expressions similar to "at least one of A, B, and C, etc.", it should generally be interpreted that the meaning of the expression is the same as that of "at least one of A, or B, or C, etc.", unless otherwise defined. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, a system having B alone, a system having C alone, a system having both A and B, a system having both A and C, a system having both B and C, and / or a system having A, B, and C, etc.

[0024] The vibration isolation method based on electrorheological fluid mainly adjusts the damping and stiffness of the electrorheological fluid through the design of electrode structure or electric field intensity, and the adjustment mode is relatively single, which cannot meet the vibration isolation demand under the complex background of vibration source. Considering that the concentration of solid particles can affect the damping and stiffness of the electrorheological fluid through the strength of the electrorheological effect, it is thought that the damping and stiffness of the electrorheological fluid can be adjusted based on the real-time control of the number of solid particles, so as to realize more fine and efficient vibration isolation. Based on this, an adjustable damping capsule vibration isolation system based on the cyclic configuration of solid particles is proposed.

[0025] Figure 1 A schematic diagram of an adjustable damping capsule vibration isolation system based on electrorheological fluid according to an embodiment of the present application is shown.

[0026] As shown in Figure 1 The adjustable damping capsule vibration isolation system based on electrorheological fluid includes a vibration isolation capsule 101, a conduit 102, and a gas pressure pump 103. The vibration isolation capsule 101 is filled with electrorheological fluid, wherein the electrorheological fluid includes solid particles and an insulating base fluid.

[0027] The solid particles, as the polarizable "functional unit" in the electrorheological fluid, spontaneously assemble into an ordered microstructure through dipole interaction under an applied electric field, thereby instantaneously and reversibly changing the macroscopic mechanical properties of the electrorheological fluid, such as viscosity, modulus, and yield stress, etc. The types of solid particles include but are not limited to: silicon dioxide, mesoporous silicon dioxide, aluminum oxide, titanium dioxide, barium titanate, conductive polymers, etc.

[0028] The role of the insulating base fluid is to provide a stable continuous phase for the solid particles. Non-conductive liquids with good electrical insulation performance can be used as the insulating base fluid to ensure that breakdown does not occur under the action of an electric field. The types of insulating base fluid include but are not limited to: silicone oil, mineral oil, halogenated hydrocarbon oil, ester oil, synthetic hydrocarbon oil, etc. The initial ratio of solid particles and insulating base fluid can be determined according to the vibration source or engineering needs.

[0029] The first end of the conduit 102 communicates to the inside of the vibration isolation capsule 101 through the upper surface of the vibration isolation capsule 101, the second end of the conduit 102 communicates to the inside of the vibration isolation capsule 101 through the lower surface of the vibration isolation capsule 101, and the third end of the conduit 102 is connected to the air pressure pump 103. In the embodiment of the present application, the material of the conduit 102 is insulating material.

[0030] Under the action of gravity, at least part of the solid particles in the electrorheological fluid move to the conduit 102, and the air pressure pump 103 is configured to pump gas into the conduit 102 based on the target gas flow, so as to use the aerodynamic drag of the gas to transport the target number of solid particles in the conduit 102 to the inside of the vibration isolation capsule 101 through the upper surface, so as to change the concentration of the solid particles in the electrorheological fluid, wherein the electrorheological fluid is configured to use the electrorheological effect to isolate the elastic wave of the vibration source based on the concentration of the solid particles in the electrorheological fluid.

[0031] The gas flow refers to the volume or mass of gas passing through a certain cross section per unit time, which is a physical quantity for measuring the speed and amount of gas flow. By increasing the gas flow, a larger aerodynamic drag can be generated to blow more solid particles in the conduit 102 from the bottom to the top and transport them to the inside of the vibration isolation capsule 101 through the upper surface. The gas flow can be adjusted by the air pressure pump 103, for example, the speed of the air pressure pump 103 can be controlled to control the frequency and speed of the air pump in and out, the higher the speed, the larger the volume of gas pumped per unit time, and the larger the gas flow.

[0032] In the embodiment of the present application, the vibration isolation capsule 101 and the conduit 102 can form a gas circulation system, in which the solid particles realize circulating flow based on the action of gravity and aerodynamic drag, and by controlling the gas flow through the air pressure pump, the target number of solid particles can be controlled to enter the vibration isolation capsule 101 to adjust the concentration of the solid particles in the electrorheological fluid. Under the action of the electric field, different concentrations of solid particles in the electrorheological fluid will produce different intensities of electrorheological effect, thereby changing the damping and stiffness of the electrorheological fluid.

[0033] The stiffness determines the natural frequency of the electrorheological fluid, and when the stiffness of the electrorheological fluid is low, the natural frequency of the electrorheological fluid is low. When the natural frequency of the electrorheological fluid is far lower than the frequency of the external vibration (at least about 70% lower than the external frequency), the vibration isolation system cannot follow the external vibration due to inertia, thereby reducing the vibration transmission of the external vibration source. At this time, the system can effectively isolate the high-frequency (greater than 100 Hz) vibration.

[0034] The core role of damping is to convert vibration energy into heat energy, friction energy and other forms of dissipation. When the external vibration frequency is less than or close to the natural frequency of the system, the system will be excited by the external vibration source to produce forced vibration, at this time the damping will consume vibration energy and reduce the driving of the external excitation to the system, so when the damping is larger, the vibration isolation effect will be better. When the external vibration frequency is higher than the natural frequency of the system, the system should be able to effectively isolate the vibration, but if the damping is larger at this time, the vibration energy of the external vibration source is more likely to be transmitted to the system through the damping force, so when the damping is smaller, the vibration isolation effect will be better.

[0035] In the embodiments of the present application, the capsule vibration isolation system can be buried in the soil, placed on the ground, or only part of the capsule vibration isolation system can be buried in the soil.

[0036] Through the embodiments of the present application, a target number of solid particles can be transported into the vibration isolation capsule to change the concentration of solid particles in the electrorheological fluid, and the damping and stiffness of the electrorheological fluid are adjusted by using the electrorheological effect, to a certain extent, the problem of difficult effective isolation of elastic waves of different vibration sources is solved, thereby improving the stability and efficiency of vibration isolation.

[0037] According to the embodiments of the present application, the adjustable damping capsule vibration isolation system further comprises: a gas compressor connected to the fourth end of the conduit, configured to control the gas pressure inside the vibration isolation capsule to change the gas-liquid mixing ratio of the gas and the electrorheological fluid, the gas and the electrorheological fluid form a two-phase system, and the two-phase system is configured to change the stiffness and damping characteristics of the two-phase system based on the gas-liquid mixing ratio.

[0038] The gas compressor changes the gas content inside the vibration isolation system by blowing or sucking gas into the conduit, and controls the gas pressure of the vibration isolation system based on the change of the gas content. Due to the compressibility of the gas, when the proportion of the gas in the two-phase system increases, the stiffness and damping of the two-phase system relatively decrease, the vibration isolation capsule is more likely to deform, and can isolate lower frequency elastic waves, but the control ability of the impact will be weakened. Due to the incompressibility of the liquid, when the proportion of the liquid in the two-phase system increases, the stiffness and damping of the two-phase system relatively increase, the vibration isolation capsule is less likely to deform, and the carrying capacity of the vibration isolation capsule is stronger, and the vibration isolation effect of higher frequency elastic waves is better. By accurately adjusting the gas-liquid ratio, the stiffness and damping characteristics of the vibration isolation capsule can be controlled, so that the vibration isolation capsule can match a specific vibration environment.

[0039] Through the embodiments of the present application, the gas pressure inside the vibration isolation system can be changed, and the stiffness and damping characteristics of the vibration isolation capsule can be adjusted by controlling the gas-liquid mixing ratio of the vibration isolation system, so that more accurate vibration isolation effect can be achieved.

[0040] According to embodiments of the present application, the tunable damping capsule vibration isolation system further comprises: a plurality of electrode housings, the plurality of electrode housings being connected in series and immersed in the electrorheological fluid, the plurality of electrode housings being configured to generate an electric field under control of a far infrared control signal, the electric field being configured to change electrical properties of the solid particles based on polarization, the electrorheological fluid being configured to adjust damping of the electrorheological fluid based on the electrical properties of the solid particles.

[0041] By connecting specific power sources to the electrode housings, an electric field can be formed between the plurality of electrode housings. The plurality of electrode housings can be arranged in a parallel plate electrode form, a coaxial cylinder electrode form, or a staggered electrode form. By designing the number of electrode housings, the arrangement between the plurality of electrode housings, and the intensity of the power sources connected to the electrode housings, different electric field distributions can be generated. Different electric field distributions can change the properties of the solid particles, and the changes in the properties of the solid particles can affect the damping and distribution of the electrorheological fluid, thereby adjusting the overall vibration isolation effect of the electrorheological fluid.

[0042] For example, a uniform electric field can be designed in which the solid particles are uniformly polarized and form positive and negative charge centers at both ends. Due to strong dipole-dipole interactions between the polarized particles, the solid particles rapidly arrange into chains along the direction of the electric field lines. Due to lateral attractive forces between adjacent chains, the chains further aggregate into thicker columnar or fibrous structures. These structures generate significant yield stress between the electrodes, thereby resisting external deformation and exhibiting solid-like properties.

[0043] For another example, a non-uniform electric field can be designed in which, in addition to the dipole-dipole interactions described above, dielectrophoretic forces exist between the solid particles. Polarized solid particles in a non-uniform electric field no longer just arrange into chains in place, but move as a whole to areas with higher field strength and undergo highly dense aggregation to form dense clusters or tree-like structures.

[0044] The particle aggregate structure formed in the high field strength area is very strong and can achieve local reinforcement or solidification of specific patterns, thereby changing the spatial distribution of the damping of the electrorheological fluid.

[0045] The far-infrared control signal can be sent by an external controller to generate different power responses to be applied to the electrode shell to generate different electric fields. For example, a direct current electric field can be generated based on the far-infrared control signal, or an alternating current electric field can be generated based on the far-infrared control signal. In the alternating current electric field, the direction of the electric field changes periodically, and the polarization direction of the solid particles also switches rapidly. At a suitable frequency of the alternating current electric field, the solid particles can still form a chain structure, but will continuously swing, and the continuous swinging and interaction of the solid particles can disrupt the gravitational sedimentation, significantly improving the suspension stability. At the same time, the current density of the electrorheological fluid can be reduced in the alternating current electric field, thereby reducing the electrolysis and power consumption problems caused by ion migration.

[0046] The electrode shell can be various conductive metal materials, such as stainless steel, copper, aluminum, and chromium-plated steel.

[0047] Through the embodiments of the present application, the control of the electric field strength and its distribution can be realized based on the far-infrared control signal and the design of the different electrode shells, to finely adjust the damping of the electrorheological fluid, thereby realizing more accurate vibration isolation effect.

[0048] According to the embodiments of the present application, the electrode shell is a porous structure, and the electrorheological fluid passes through the porous structure of the electrode shell under the action of the elastic wave. The porous structure is configured to increase the energy dissipation of the elastic wave based on viscosity.

[0049] The porous structure of the electrode shell can be in the form of a metal wire mesh or a metal grid. For example, a two-dimensional porous structure is formed by weaving different numbers of metal wires. The material of the metal wire can be stainless steel or titanium. The porous structure of the electrode shell can also be in the form of metal foam, or metal fibers or metal powder are sintered into a porous block. In the embodiments of the present application, the number of pores, the distribution of the pores, the pore size, and the porosity of the electrode shell can be adjusted according to actual conditions.

[0050] In the embodiments of the present application, the vibration of the elastic wave drives the movement of the electrorheological fluid, and the movement of the electrorheological fluid dissipates the energy of the elastic wave. At the same time, the movement process of the electrorheological fluid passes through the porous structure of the electrode shell. When the fluid flows in the narrow pore, strong viscous friction occurs between the fluid and the pore wall. The greater the viscous friction, the more kinetic energy is converted into internal energy and dissipated during the movement of the fluid, thereby realizing the conversion of the kinetic energy of the elastic wave to the internal energy between the electrorheological fluid and the electrode shell. Therefore, the porous structure of the electrode shell can be optimized and designed to increase the viscous friction between the electrorheological fluid and the electrode shell, thereby increasing the energy dissipation of the elastic wave. For example, the tortuosity of the pores of the electrode shell can be increased. The longer the path of the electrorheological fluid flowing through the pores, the longer the total distance of the electrorheological fluid rubbing against the pore wall, and the greater the energy dissipation.

[0051] By the embodiment of the present application, the viscous friction between the electrorheological fluid and the electrode shell during the movement of the electrorheological fluid can be increased based on the porous structure of the electrode shell, so that the kinetic energy of the elastic wave is converted into thermal energy of the electrorheological fluid and the electrode shell, the energy dissipation of the elastic wave is increased, and the vibration isolation effect is improved.

[0052] According to the embodiment of the present application, the adjustable damping capsule vibration isolation system further comprises: a first acceleration sensor, the first acceleration sensor is closer to the vibration source than the vibration isolation capsule, and the first acceleration sensor is configured to collect a first acceleration signal of the elastic wave of the vibration source; a second acceleration sensor, the second acceleration sensor is farther away from the vibration source than the vibration isolation capsule, and the second acceleration sensor is configured to collect a second acceleration signal of the elastic wave after being processed by the vibration isolation capsule; and a controller, configured to receive the first acceleration signal and the second acceleration signal, and generate a far-infrared control signal based on the first acceleration signal and / or the second acceleration signal.

[0053] The controller can adjust the vibration isolation system based on the first acceleration signal. For example, the first acceleration sensor can collect the first acceleration signal of the elastic wave, and obtain the frequency information of the elastic wave based on the first acceleration signal. In the case of detecting that the frequency of the elastic wave is a low-frequency wave less than 20 Hz, the controller can generate a far-infrared control signal to control the electric field to be a uniform direct-current electric field, at this time, the solid particles in the electrorheological fluid form a stable chain structure, which will undergo significant shear deformation when subjected to the action of the elastic wave, thereby dissipating the energy of the elastic wave. In the low-frequency vibration, the fluid has enough time to undergo significant shear deformation, thereby fully and smoothly dissipating the energy. In the case of detecting that the frequency of the elastic wave is a high-frequency wave greater than 100 Hz, the controller can generate a far-infrared control signal to control the electric field to be an alternating electric field, under the high-frequency alternating electric field, the electric field strength constantly changes, and the polarization degree of the solid particles also constantly changes. In the compression phase of the elastic wave, the electric field strength increases, the polarization degree of the solid particles increases, and the friction between the solid particles and the elastic wave increases. In the stretching phase of the elastic wave, the electric field strength decreases, the polarization degree of the solid particles decreases, and the rebound force of the elastic wave decreases, thereby dissipating the energy of the elastic wave.

[0054] The controller can also adjust the vibration isolation system based on the output feedback of the second acceleration signal. For example, the second acceleration sensor can collect the frequency band energy information of the elastic wave, and adjust the intensity of the electric field based on the frequency band energy information, adjust the electric field characteristics of the solid particles based on the polarization effect of different electric field intensities, thereby dissipating more frequency band energy. The controller can also adjust the related parameters of the vibration isolation system based on the comprehensive analysis of the first acceleration signal and the second acceleration signal.

[0055] According to the embodiment of the present application, the adjustable damping capsule vibration isolation system further comprises a photoelectric sensor fixedly arranged at the first end of the conduit and configured to measure the amount of solid particles conveyed to the inside of the vibration isolation capsule through the upper surface based on the light scattering principle and adjust the target gas flow based on the measurement result.

[0056] In the embodiment of the present application, in the case where the gas carrying solid particles passes through the detection area, the solid particles can be irradiated by a laser or LED light source, and the solid particles will scatter or absorb the light, resulting in a change in light intensity. The photoelectric sensor receives the change in these light signals and converts them into an electrical signal, and the amount of solid particles is calculated by analyzing the characteristics of the electrical signal. The photoelectric sensor can be a photodiode, a photoconductive detector, or a photomultiplier tube.

[0057] In the case where the amount of solid particles is detected to be more than the target set value, a control signal can be sent to the air pressure pump to reduce the aerodynamic drag of the gas by adjusting the gas flow, thereby reducing the amount of solid particles blown onto the upper surface of the vibration isolation capsule.

[0058] According to the embodiment of the present application, the adjustable damping capsule vibration isolation system further comprises a filter device fixedly arranged inside the vibration isolation capsule and located below the electrorheological fluid, and configured to selectively filter the electrorheological fluid into the conduit.

[0059] In the embodiment of the present application, the insulating base fluid in the electrorheological fluid needs to be stabilized inside the vibration isolation capsule to prevent it from flowing into the conduit under the action of gravity, thereby affecting the vibration isolation effect of the electrorheological fluid. Therefore, a filter device is needed to selectively filter the electrorheological fluid, filter the solid particles in the electrorheological fluid into the conduit, and the insulating base fluid cannot pass through the filter device into the conduit.

[0060] According to the embodiment of the present application, the filter device is a polytetrafluoroethylene microporous membrane, which is configured to selectively filter the solid particles based on hydrophobic and oleophobic properties and a porous structure.

[0061] Polytetrafluoroethylene microporous membranes are usually prepared by a sintering process, forming a network of interconnected micropores in the membrane, and the pore size can be precisely controlled. This structure provides a physical channel for mass transfer, but whether a substance can pass through depends not only on the pore size, but also on the properties of the medium. Polytetrafluoroethylene has a large number of carbon-fluorine bonds in its molecular structure, and is one of the materials with the lowest surface energy known so far, with extremely strong hydrophobic and oleophobic properties. Unmodified polytetrafluoroethylene microporous membranes are almost not wetted by any liquid, and liquid on its surface will form spherical droplets, which are difficult to spread or penetrate into micropores. In the case where the diameter of solid particles is smaller than the pore size of the polytetrafluoroethylene microporous membrane, the solid particles can directly pass through the microporous channel under the driving of external gravity. Moreover, solid particles usually have a certain rigidity and do not have obvious interfacial interaction with the polytetrafluoroethylene microporous membrane, so they will not be intercepted by the membrane surface or the pore.

[0062] According to an embodiment of the present application, the adjustable damping capsule vibration isolation system further comprises a buffer device fixedly arranged inside the vibration isolation capsule and located above the electrorheological fluid, configured to uniformly disperse the target number of solid particles into the electrorheological fluid, and the uniformly dispersed target number of solid particles form a stable suspension in the electrorheological fluid.

[0063] In the electrorheological fluid, each solid particle will be polarized under the action of an electric field, generating a dipole-dipole interaction. Only when the solid particles are uniformly dispersed, each solid particle can uniformly respond to the electric field, and the dipole-dipole interaction can be uniformly transmitted throughout the system, thereby driving the solid particles to arrange into a continuous chain or column structure along the direction of the electric field. If the solid particles are not uniformly distributed, the local concentration of solid particles is too high or too low, which will lead to large differences in polarization intensity and disorder of dipole-dipole interaction, and it is impossible to form a regular load-bearing structure throughout the system, ultimately weakening or even losing the electrorheological effect. Therefore, in order to ensure the stability of the damping control based on the electrorheological fluid, the solid particles need to be uniformly dispersed to form a stable suspension.

[0064] In an embodiment of the present application, the buffer device can be a plurality of mesh screens. Through the screening action of the mesh screens, the solid particles can uniformly fall into the base fluid in the form of fine "particle flow", avoiding concentrated accumulation.

[0065] According to an embodiment of the present application, the buffer device can be a mechanical stirring propeller, which is configured to generate rotation based on aerodynamic drag and uniformly disperse the target number of solid particles based on the rotation.

[0066] Figure 2 A schematic diagram of an adjustable damping capsule vibration isolation system based on an electrorheological fluid according to another embodiment of the present application is shown.

[0067] As Figure 2As shown, the adjustable damping bladder vibration isolation system based on electrorheological fluid includes a vibration isolation bladder 101, a conduit 102, a pneumatic pump 103, a gas compressor 104, a photoelectric sensor 105, a buffer device 106, an electrode housing 107, and a filter device 108.

[0068] The vibration isolation capsule 101 is filled with an electrorheological fluid, which includes solid particles and an insulating base fluid. An electrode housing 107 is immersed in the electrorheological fluid and can generate an electric field under the control of a far-infrared control signal to polarize the solid particles, thereby altering the damping characteristics of the electrorheological fluid. A filter device 108 is used to selectively filter out the electrorheological fluid; solid particles pass through the filter device 108 and enter the conduit 102 under gravity, while the insulating base fluid cannot be filtered out and remains stably in the vibration isolation capsule 101. A pneumatic pump 103 pumps gas into the conduit 102, using pneumatic drag to blow the solid particles upwards in the conduit 102, transporting them through the upper surface of the vibration isolation capsule 101 to its interior. A photoelectric sensor 105 is located at the port where the conduit 102 connects to the upper surface of the vibration isolation capsule 101, and is used to measure the number of solid particles transported through the upper surface to the interior of the vibration isolation capsule 101. Solid particles entering the vibration isolation bladder 101 via the upper surface will be evenly dispersed after passing through the buffer device 106 and fall into the electrorheological fluid to form a stable suspension.

[0069] Figure 3 A schematic diagram of an adjustable damping bladder vibration isolation system based on electrorheological fluid according to another embodiment of the present invention is shown.

[0070] like Figure 3 As shown, the adjustable damping capsule vibration isolation system based on electrorheological fluid includes a first accelerometer 301, a second accelerometer 302, a first vibration isolation capsule 311, a second vibration isolation capsule 312, a first conduit 321, a second conduit 322, a first air pump 331, and a second air pump 332. The first accelerometer 301, the second accelerometer 302, the first vibration isolation capsule 311, and the second vibration isolation capsule 312 are arranged according to the direction of the elastic wave source. The first accelerometer 301 is closest to the vibration source and is used to collect the first acceleration signal of the initial elastic wave generated by the vibration source. The first vibration isolation capsule 311 and the second vibration isolation capsule 312 are set at a certain interval, with the interval direction perpendicular to the wave source direction. After the initial elastic wave undergoes vibration isolation processing by the first vibration isolation capsule 311 and the second vibration isolation capsule 312, the second acceleration signal of the processed elastic wave is collected by the second accelerometer 302. The vibration isolation control of the vibration isolation system can be adjusted based on the first and second acceleration signals. The relationship between the first vibration isolation bladder 311, the second vibration isolation bladder 312, the first conduit 321, the second conduit 322, the first air pump 331, and the second air pump 332 is as described above and will not be repeated here.

[0071] It will be appreciated by those skilled in the art that features of the various embodiments described herein can be combined and / or integrated in various combinations and / or permutations, even if such combinations and / or permutations are not expressly described herein. In particular, features of the various embodiments described herein can be combined and / or integrated in various combinations and / or permutations without departing from the scope of the present application. All such combinations and / or integrations are within the scope of the present application.

[0072] The above describes embodiments of the present application. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present application. Although each of the embodiments has been described above, this does not mean that measures in the various embodiments cannot be used advantageously in combination. Various alternatives and modifications can be made to the embodiments without departing from the scope of the present application, and such alternatives and modifications are intended to fall within the scope of the present application.

Claims

1. An electrorheological fluid based tunable damper capsule isolation system, characterized in that, The system comprises: a vibration isolation capsule filled with electrorheological fluid, wherein the electrorheological fluid comprises solid particles; a gas pump; and a conduit, a first end of the conduit communicating with an interior of the vibration isolation capsule through an upper surface of the vibration isolation capsule, a second end of the conduit communicating with the interior of the vibration isolation capsule through a lower surface of the vibration isolation capsule, and a third end of the conduit connected to the gas pump; wherein at least some of the solid particles in the electrorheological fluid move to the conduit under the action of gravity; the gas pump is configured to pump gas into the conduit based on a target gas flow rate, so as to use the aerodynamic drag of the gas to transport a target amount of the solid particles in the conduit to the interior of the vibration isolation capsule through the upper surface, so as to change the concentration of the solid particles in the electrorheological fluid, and the electrorheological fluid is configured to use the electrorheological effect based on the concentration of the solid particles in the electrorheological fluid to isolate the elastic wave of the vibration source.

2. The system of claim 1, wherein, The system further comprises: a gas compressor connected to a fourth end of the conduit and configured to control the gas pressure in the interior of the vibration isolation capsule, so as to change the gas-liquid mixing ratio of the gas and the electrorheological fluid, the gas and the electrorheological fluid forming a two-phase system, and the two-phase system being configured to change the stiffness and damping characteristics of the two-phase system based on the gas-liquid mixing ratio.

3. The system of claim 1 or 2, wherein, The system further comprises: a plurality of electrode housings connected in series and immersed in the electrorheological fluid, the plurality of electrode housings being configured to generate an electric field under the control of a far-infrared control signal, the electric field being configured to change the electrical properties of the solid particles based on polarization, and the electrorheological fluid being configured to adjust the damping of the electrorheological fluid based on the electrical properties of the solid particles.

4. The system of claim 3, wherein, The electrode housings are porous structures, the electrorheological fluid passes through the electrode housings of the porous structures under the action of the elastic wave, and the porous structures are configured to increase the energy dissipation of the elastic wave based on viscosity.

5. The system of claim 3, wherein, The system further comprises: a first acceleration sensor closer to the vibration source than the vibration isolation capsule, the first acceleration sensor being configured to collect a first acceleration signal of the elastic wave of the vibration source; a second acceleration sensor farther from the vibration source than the vibration isolation capsule, the second acceleration sensor being configured to collect a second acceleration signal of the elastic wave after being processed by the vibration isolation capsule; a controller configured to receive the first acceleration signal and the second acceleration signal, and generate the far-infrared control signal based on the first acceleration signal and / or the second acceleration signal.

6. The system of claim 1 or 2, wherein, The system further comprises: a photoelectric sensor fixedly arranged at the first end of the conduit and configured to measure the amount of the solid particles transported to the interior of the vibration isolation capsule through the upper surface based on the light scattering principle, and adjust the target gas flow rate based on the measurement result.

7. The system of claim 1 or 2, wherein, The system further comprises: a filtering device fixedly arranged in the interior of the vibration isolation capsule and located below the electrorheological fluid, and configured to selectively filter the electrorheological fluid to the conduit.

8. The system of claim 7, wherein, The filter device is a polytetrafluoroethylene microporous membrane configured to selectively filter out the solid particles based on hydrophobic and oleophobic properties and a porous structure.

9. The system of claim 1 or 2, wherein, The system further comprises: a buffer device fixedly arranged inside the vibration isolation capsule and above the electrorheological fluid, configured to disperse the target amount of solid particles into the electrorheological fluid, and the dispersed target amount of solid particles form a stable suspension in the electrorheological fluid.

10. The system of claim 9, wherein, The buffer device is a mechanical stirring propeller configured to generate rotation based on the aerodynamic drag, and disperse the target amount of solid particles based on the rotation.

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