Composite thick laminated rubber seismic isolation bearing with adaptive damping and seismic isolation method thereof

Abstract

The present application belongs to the technical field of shock insulation support, and particularly relates to a composite thick laminated rubber shock insulation support with self-adaptive damping and a shock insulation method thereof.The technical scheme is as follows: a composite thick laminated rubber shock insulation support with self-adaptive damping, comprising an upper connecting steel plate and a lower connecting steel plate, a steel plate layer, a rubber layer, a pressure sensing layer and a sensor network layer are arranged between the upper connecting steel plate and the lower connecting steel plate, a plurality of fluid cavities are arranged in the rubber layer and are communicated through pipelines; the pressure sensing layer is provided with an electromagnetic coil, a piezoelectric driving unit and a valve body, the valve body is connected with the fluid cavities through a conduit, the electromagnetic coil is sleeved on the valve body, and the electromagnetic coil and the valve body are electrically connected with the piezoelectric driving unit respectively.The present application provides a composite thick laminated rubber shock insulation support with self-adaptive damping and a shock insulation method thereof, which has the functions of intelligent sensing and self-adaptive adjustment and can maintain long-term stable performance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of seismic isolation bearings, and particularly relates to a composite thick laminated rubber seismic isolation bearing with self-adaptive damping and a seismic isolation method thereof. BACKGROUND

[0002] The existing similar technical patent results mainly include:

[0003] 1) The main innovation point of CN117966901B patent is to realize the separation of upper and lower support plates through an air spring system, to realize the automatic adjustment of bearing height through a gas pressure control system, and to have an automatic reset function.

[0004] 2) The main innovation point of CN211923084U patent is to arrange lead rubber seismic isolation bearings in the peripheral area of the seismic isolation layer and laminated rubber bearings in the internal area, to arrange velocity type dampers in two orthogonal directions, and to reduce the torsional effect through the reasonable arrangement and optimization combination of different types of bearings.

[0005] 3) The main innovation point of CN218323290U patent is a composite damping system combining a spring and a damper, has a spring pre-tightening force adjusting mechanism, and realizes horizontal displacement through a sliding block and a guide rail.

[0006] Traditional seismic isolation bearings generally have the problems of fixed damping characteristics and lack of dynamic adjustment capability, and cannot optimize their seismic isolation performance in real time according to the input characteristics of different intensity earthquakes. At the same time, they show significant nonlinear characteristics when subjected to large displacement, resulting in difficulty in maintaining stable seismic isolation effect of the bearings. In addition, due to the inherent characteristics of rubber materials, the bearings will have performance attenuation, damping characteristic change and other aging problems during long-term use, affecting their service life and reliability. When facing different horizontal earthquake excitations, the existing bearings are difficult to achieve optimal seismic isolation effect, and cannot meet the differentiated protection needs of buildings under different earthquake levels. SUMMARY

[0007] In order to solve the above-mentioned problems existing in the prior art, the purpose of the present application is to provide a composite thick laminated rubber seismic isolation bearing with self-adaptive damping and a seismic isolation method thereof, which has intelligent sensing and self-adaptive adjustment functions and can maintain long-term stable performance.

[0008] The technical solution adopted by the present application is:

[0009] A composite thick laminated rubber seismic isolation bearing with self-adaptive damping, comprising an upper connecting steel plate and a lower connecting steel plate, a steel plate layer, a rubber layer, a pressure sensing layer and a sensor network layer are arranged between the upper connecting steel plate and the lower connecting steel plate, and a plurality of fluid cavities connected through pipelines are arranged in the rubber layer;

[0010] The fluid cavity is filled with an intelligent fluid, and the formula of the intelligent fluid comprises a base carrier, magnetic particles, a dispersant system and a stabilizer;

[0011] The pressure sensing layer is provided with an electromagnetic coil, a piezoelectric driving unit and a valve body, the valve body is connected with the fluid cavity through a conduit, the electromagnetic coil is sleeved on the valve body, and the electromagnetic coil and the valve body are electrically connected with the piezoelectric driving unit respectively;

[0012] The sensor network layer comprises force sensors for monitoring external loads borne by the support, displacement sensors, temperature sensors, pressure sensors for monitoring internal pressure of the intelligent fluid system and acceleration sensors;

[0013] Further comprising a control system, and the piezoelectric driving unit, the force sensors, the displacement sensors, the temperature sensors, the pressure sensors and the acceleration sensors are electrically connected with the control system.

[0014] When an earthquake occurs, the system realizes whole-process self-adaptive adjustment through a complete intelligent sensing and control mechanism. In the initial stage, the acceleration sensors arranged at key positions of the support can quickly capture the arrival of seismic waves, and at the same time, the displacement sensors and the force sensor network start the high-frequency sampling mode immediately, and real-time acquisition of the deformation state and the dynamic load information borne by the support. The control system switches to the emergency response state immediately upon detecting abnormal signals, and starts to execute the preset rapid response strategy.

[0015] After entering the self-adaptive adjustment stage, the core controller of the system calculates the optimal damping parameters under the current state within milliseconds based on the real-time collected multi-dimensional data, and then the control signals are synchronously transmitted to the piezoelectric driving high-precision valve system and the electromagnetic coil array. The piezoelectric valve can accurately adjust to the target opening within 50 milliseconds, and at the same time, the controllable magnetic field strength generated by the electromagnetic coil is quickly adjusted within the range of 0-400kA / m, which directly acts on the magnetorheological fluid to make its viscosity characteristics change accordingly. This synergistic effect makes the intelligent fluid flowing through the support cavity produce a precisely controllable damping force, thereby realizing dynamic optimization of the overall stiffness and damping characteristics of the support.

[0016] During the duration of the earthquake, the system enters the continuous optimization mode. The controller continuously updates and optimizes the control strategy by real-time analysis of the mechanical response characteristics of the support, the displacement trajectory and the shock absorption effect of the overall structure. The system uses advanced adaptive algorithms to dynamically adjust the control parameters according to the variation characteristics of the seismic wave, thereby ensuring the safety of the structure while minimizing the impact of the earthquake. This intelligent continuous optimization mechanism ensures that the support always maintains the best shock absorption performance during the entire earthquake process, thereby providing reliable isolation protection for the upper structure.

[0017] The key of the dynamic response mechanism is the highly integrated sensing-control-execution system and the intelligent control algorithm developed based on a large number of experimental data. The system can exhibit excellent adaptability and reliability under different intensity earthquake actions, and realizes the intelligent damping effect that the traditional passive isolation bearing cannot achieve. Through precise multi-parameter collaborative control, the damping ratio of the bearing can be continuously adjusted in the range of 5%-25%, meeting the differentiated requirements of different use conditions on the isolation performance.

[0018] As a preferred scheme of the present application, the fluid cavity comprises a main cavity, an inner lining corrosion protection layer is arranged in the main cavity, a fluid containing structure is arranged in the inner lining corrosion protection layer, the intelligent fluid fills the fluid containing structure, and a communication pipeline is connected between adjacent main cavities.

[0019] As a preferred scheme of the present application, the material of the main cavity is carbon fiber composite material, the inner lining corrosion protection layer is a nano-aluminum oxide+graphene composite coating, the fluid containing structure adopts a nano-porous material to construct a microstructure, the material of the fluid containing structure is graphene oxide aerogel, the communication pipeline uses graphene reinforced composite material, and the sealing system comprises a fluororubber O-ring as a main seal and a polytetrafluoroethylene dustproof ring as a secondary seal.

[0020] As a preferred scheme of the present application, the intelligent fluid comprises the following components by weight:

[0021] The base carrier is a low-volatility silicone oil;

[0022] The magnetic particles are spherical carbonyl iron powder 70-75 parts;

[0023] The dispersant system comprises a main body of oleic acid 23 parts and a synergist of sodium dodecyl benzene sulfonate 0.51 parts;

[0024] The stabilizer comprises a main body of hydrophobic nano-silicon dioxide 12 parts and an auxiliary of organic montmorillonite 0.3-0.5 parts.

[0025] A preparation method of an intelligent fluid for a composite thick laminated rubber seismic isolation bearing with self-adaptive damping comprises the following steps:

[0026] S1: magnetic particle pretreatment; base carrier pretreatment; stabilizer pretreatment;

[0027] S2: base dispersion: carrier preparation, dispersant addition, and stabilizer addition;

[0028] S3: magnetic particle dispersion: magnetic particle addition, high-energy dispersion treatment,

[0029] S4: vacuum treatment: vacuum degassing and ultrasonic treatment.

[0030] As a preferred scheme of the present application, in step S1:

[0031] S11: Magnetic particle pretreatment:

[0032] Spherical carbonyl iron powder pretreatment: vacuum drying: 80±5℃, 24h; sieving: 400 mesh standard sieve; magnetic detection: saturation magnetization≥200emu / g;

[0033] Surfactant pretreatment: oleic acid heating: 60±2℃ incubation; sodium dodecyl benzene sulfonate preparation: 5% aqueous solution;

[0034] S12: Carrier silicone oil pretreatment:

[0035] Vacuum degassing: -0.095Mpa, 2h; filtration: 5μm precision filtration; viscosity test: ensure 100-500MPa·s;

[0036] S13: Stabilizer pretreatment:

[0037] Nano-silicon dioxide activation: 120℃, 4h; organic montmorillonite modification: quaternary ammonium salt treatment.

[0038] As a preferred scheme of the present application, in step S2:

[0039] S21: Carrier preparation:

[0040] Add pretreated silicone oil to the reaction kettle; temperature control: 45±2℃; stirring speed: 300rpm;

[0041] S22: Dispersant addition:

[0042] Slowly add oleic acid: 2-3% mass fraction, stir evenly: 15min; add sodium dodecyl benzene sulfonate: 0.5-1% mass fraction, continue stirring: 10min;

[0043] S23: Stabilizer addition:

[0044] Add modified silicon dioxide: 12% mass fraction; add modified montmorillonite: 0.3-0.5% mass fraction; high-speed shear dispersion: 8000rpm, 30min.

[0045] As a preferred scheme of the present application, in step S3:

[0046] S31: Magnetic particle addition:

[0047] Add pretreated iron powder in batches; each batch interval: 5min; total addition amount: 70-75% mass fraction; temperature control: 50±2℃;

[0048] S32: High-energy dispersion treatment:

[0049] High speed shearing: 12000 rpm; Time: 2 h; Intermittent operation: stop for 2 min every 30 min; Cooling control: maintain 50±2 DEG C.

[0050] As a preferred scheme of the present application, in step S4:

[0051] S41: vacuum degassing:

[0052] Pressure: -0.098 Mpa; Temperature: 60 DEG C; Time: 1 h; Intermittent stirring: 100 rpm;

[0053] S42: ultrasonic treatment:

[0054] Power density: 300 W / L; Time: 30 min; Intermittent mode: work for 30 s, stop for 5 s.

[0055] A seismic isolation method of a composite thick laminated rubber seismic isolation support with adaptive damping, comprising the following steps:

[0056] T1: static working state: the intelligent fluid is in a basic viscosity state, the valve keeps a preset opening degree, and the sensor continuously monitors basic data;

[0057] T2: dynamic response process:

[0058] T21: initial triggering stage of earthquake: the acceleration sensor detects seismic waves, the displacement sensor monitors support deformation in real time, the force sensor monitors dynamic load changes, and the control system starts an emergency response mode;

[0059] T22: adaptive adjustment stage: the control system calculates the optimal damping piezoelectric valve opening degree in real time based on monitoring data; the electromagnetic coil generates a magnetic field to control the viscosity of the fluid; the intelligent fluid flow generates controllable damping force; and the support stiffness and damping are dynamically adjusted

[0060] T23: continuous optimization stage: real-time evaluation of damping effect; dynamic optimization of control parameters; continuous adaptive adjustment of the system; and best damping performance is ensured.

[0061] The present application has the following beneficial effects:

[0062] The acceleration sensor detects seismic waves, the displacement sensor monitors support deformation in real time, the force sensor monitors dynamic load changes, and the control system starts an emergency response mode. The control system calculates the optimal damping piezoelectric valve opening degree in real time based on monitoring data, and the electromagnetic coil generates a magnetic field to control the viscosity of the fluid, and the intelligent fluid flow generates controllable damping force, and the support stiffness and damping are dynamically adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0063] Figure 1It is a structural schematic diagram of the seismic isolation support of the present invention;

[0064] Figure 2 It is a flow chart of the seismic isolation method of the present invention.

[0065] In the figure: 1-upper connecting steel plate; 2-lower connecting steel plate; 3-steel plate layer; 4-rubber layer; 5-pressure sensing layer; 6-sensor network layer; 7-fluid cavity. DETAILED DESCRIPTION

[0066] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of 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 part of the embodiments of the present invention, not all of the 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.

[0067] 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. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention 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.

[0068] like Figure 1 As shown, the composite thick laminated rubber seismic isolation bearing with adaptive damping of this embodiment includes an upper connecting steel plate 1 and a lower connecting steel plate 2. A steel plate layer 3, a rubber layer 4, a pressure sensing layer 5, and a sensor network layer 6 are arranged between the upper connecting steel plate 1 and the lower connecting steel plate 2. A plurality of fluid cavities 7 connected by pipes are provided in the rubber layer 4.

[0069] The fluid cavity 7 is filled with a smart fluid, the formula of which includes a basic carrier, magnetic particles, a dispersant system and a stabilizer;

[0070] The pressure sensing layer 5 is provided with an electromagnetic coil, a piezoelectric drive unit and a valve body. The valve body is connected to the fluid cavity 7 through a conduit. The electromagnetic coil is sleeved on the valve body. The electromagnetic coil and the valve body are electrically connected to the piezoelectric drive unit respectively.

[0071] The sensor network layer 6 includes a force sensor, a displacement sensor, a temperature sensor for monitoring the external load borne by the support, a pressure sensor and an acceleration sensor for monitoring the internal pressure of the intelligent fluid system;

[0072] The control system is electrically connected with the piezoelectric driving unit, the force sensor, the displacement sensor, the temperature sensor, the pressure sensor and the acceleration sensor.

[0073] The fluid cavity 7 is arranged between the steel plate layer 3 and the rubber layer 4, the pressure sensing layer 5 is arranged below the rubber layer 4, and the sensor network layer 6 is arranged below the bottommost rubber layer 4. The fluid cavities 7 are connected with each other through the communication pipelines to form a closed loop system. The pressure sensing layer 5 is connected with the fluid cavity 7 through the vertical pipeline to realize pressure monitoring and control. The sensor network layer 6 forms a feedback loop with the pressure sensing layer 5 and the fluid system to realize real-time monitoring and control.

[0074] The connection and control relationship of the electromagnetic coil, the piezoelectric driving unit and the valve body are as follows: the electromagnetic coil is surrounded outside the valve body and is used for generating a controllable magnetic field (0-400kA / m); the piezoelectric driving unit is directly connected with the valve body and controls the valve opening degree (0-100% continuously adjustable). The control process is as follows: the piezoelectric driving unit receives the control signal and accurately controls the valve opening degree; the electromagnetic coil synchronously adjusts the magnetic field intensity; and the valve body cooperatively adjusts the fluid flow state according to the opening degree and the magnetic field intensity.

[0075] The function of the temperature sensor is to monitor the working temperature of the intelligent fluid and ensure that the system operates in a suitable temperature range.

[0076] The difference between the pressure sensor and the force sensor is as follows: the pressure sensor is used for monitoring the internal pressure (0-15MPa) of the fluid system; and the force sensor is used for monitoring the external load (0-2000kN) borne by the support.

[0077] The function of the piezoelectric valve opening degree adjustment is to control the fluid flow rate and influence the energy dissipation efficiency, to adjust the fluid exchange amount between the chambers and influence the overall stiffness characteristics, and to cooperatively act with the magnetic field intensity to realize more accurate damping adjustment.

[0078] The present application realizes the adjustment of the equivalent damping ratio in the range of 5%-25% through the cooperative control of the valve opening degree and the magnetic field intensity, ensures the optimal damping effect of the system under different seismic levels, adjusts the fluid flow rate through the valve opening degree, adjusts the fluid viscosity through the magnetic field intensity, and the two cooperate to form a complete control system. The double adjustment mechanism can provide more accurate and flexible performance control.

[0079] I. Overall structure composition:

[0080] 1. Basic component layer:

[0081] The upper connecting steel plate 1 is made of Q345 steel and has a thickness of 40-60mm.

[0082] The lower connecting steel plate 2 is made of Q345 steel and has a thickness of 50-70mm.

[0083] Rubber layer 4: natural rubber, Shore A hardness 60±5;

[0084] Steel plate layer 3: Q235 steel plate, thickness 35 mm;

[0085] Overall size: diameter 600 1200 mm, height 250 400 mm.

[0086] 2. Intelligent fluid system:

[0087] 2.1 Fluid formula design:

[0088] Base carrier: low-volatile silicone oil (viscosity 100 500 mPa·s);

[0089] Magnetic particles: spherical carbonyl iron powder: particle size range: 35 μm, saturation magnetization: ≥200 emu / g, mass fraction: 70 75%;

[0090] Dispersant system: main body: oleic acid (mass fraction 23%), synergist: sodium dodecyl benzene sulfonate (mass fraction 0.51%);

[0091] Stabilizer: main body: hydrophobic nano-silicon dioxide (mass fraction 12%), auxiliary: organic montmorillonite (mass fraction 0.3 0.5%).

[0092] 2.2 Intelligent fluid preparation process:

[0093] S1: raw material pretreatment:

[0094] S11: magnetic particle pretreatment:

[0095] 1) Spherical carbonyl iron powder pretreatment:

[0096] Vacuum drying: 80±5℃, 24h;

[0097] Screening: 400 mesh standard sieve;

[0098] Magnetic detection: saturation magnetization ≥200 emu / g.

[0099] 2) Surfactant pretreatment:

[0100] Oleic acid heating: 60±2℃ incubation;

[0101] Sodium dodecyl benzene sulfonate preparation: 5% aqueous solution.

[0102] S12: carrier silicone oil pretreatment:

[0103] Vacuum degassing: -0.095 MPa, 2h;

[0104] Filtration: 5 μm precision filtration;

[0105] Viscosity test: Ensure 100-500 mPa-s.

[0106] S13: Stabilizer pretreatment:

[0107] Nano-silica activation: 120°C, 4h;

[0108] Organic montmorillonite modification: quaternary ammonium salt treatment.

[0109] S2: First stage: Basic dispersion:

[0110] S21: Carrier preparation:

[0111] Add pretreated silicone oil to the reaction kettle;

[0112] Temperature control: 45±2°C;

[0113] Stirring speed: 300 rpm.

[0114] S22: Add dispersant:

[0115] Slowly add oleic acid: 2-3% mass fraction;

[0116] Stir evenly: 15 min;

[0117] Add sodium dodecyl benzene sulfonate: 0.5-1% mass fraction;

[0118] Continue stirring: 10 min.

[0119] S23: Add stabilizer:

[0120] Add modified silica: 12% mass fraction;

[0121] Add modified montmorillonite: 0.3-0.5% mass fraction;

[0122] High-speed shearing dispersion: 8000 rpm, 30 min.

[0123] S3: Magnetic particle dispersion:

[0124] S31: Add magnetic particles:

[0125] Add pretreated iron powder in batches;

[0126] Interval between each batch: 5 min;

[0127] Total amount: 70-75% mass fraction;

[0128] Temperature control: 50±2°C.

[0129] S32: High-energy dispersion treatment:

[0130] High shear: 12000 rpm;

[0131] Time: 2h;

[0132] Intermittent operation: stop for 2 min every 30 min;

[0133] Cooling control: maintain 50±2℃.

[0134] S4: Vacuum treatment:

[0135] S41: Vacuum degassing:

[0136] Pressure: -0.098 Mpa;

[0137] Temperature: 60℃;

[0138] Time: 1h;

[0139] Intermittent stirring: 100 rpm.

[0140] S42: Ultrasonic treatment:

[0141] Power density: 300 W / L;

[0142] Time: 30 min;

[0143] Intermittent mode: work for 30 s, stop for 5 s.

[0144] 2.3 Fluid property indicators:

[0145] Zero-field viscosity: 0.2-0.5 Pa·s;

[0146] Yield stress: 50-80 kPa;

[0147] Settling stability: 24h sedimentation rate <1%;

[0148] Temperature adaptability: -40℃ to +150℃;

[0149] Response time: <10 ms;

[0150] Magnetic field strength range: 0-400 kA / m;

[0151] Shear stability: >10 6 No performance attenuation after secondary circulation.

[0152] 2.4 Cavity structure design:

[0153] Main cavity: diameter: 80-120 mm, height: 30-50 mm, distribution interval: 200-300 mm, total number: 6-8, volume ratio: 15-20%, material: carbon fiber composite material.

[0154] Inner liner anticorrosion layer: nano-alumina + graphene composite coating.

[0155] Fluid containment structure: constructed with nano-porous material, material: graphene oxide aerogel, porosity: >90%, specific surface area: >800m 2 / g. Advantages: improve fluid distribution uniformity, enhance heat conduction efficiency, improve rheological effect.

[0156] Communication pipeline: using graphene reinforced composite material, structure: multi-stage tree-like microchannel network.

[0157] Sealing system: main seal: fluororubber O-ring (temperature resistance -40℃ to +200℃), secondary seal: polytetrafluoroethylene dustproof ring, sealing level: IP67.

[0158] 3. Pressure sensing valve system (with built-in electromagnetic coil):

[0159] 3.1 Piezoelectric drive unit:

[0160] Material: PZT5H piezoelectric ceramic;

[0161] Size: diameter 30mm, thickness 2mm;

[0162] Piezoelectric constant: d33 = 590 × 10 -12 C / N;

[0163] Dielectric constant: εr = 3400;

[0164] Curie temperature: ≥250℃;

[0165] Electromechanical coupling coefficient: kp≥0.62.

[0166] 3.2 Valve body structure:

[0167] Valve core: high-strength titanium alloy, surface DLC coating; valve seat: 316L stainless steel, surface hardening treatment; guide bearing: self-lubricating polyether ether ketone (PEEK); sealing element: high-pressure resistant fluororubber composite sealing ring. 3.3 Control parameters:

[0168] Pressure sensing range: 0-10Mpa;

[0169] Response time: <50ms;

[0170] Valve opening: 0-100% continuously adjustable;

[0171] Adjusting accuracy: ±5%;

[0172] Repeat positioning accuracy: ≤0.02mm;

[0173] Operating temperature: -20℃ to +80℃;

[0174] Service life: >10 6 Sub-cycle.

[0175] 3.4 Electromagnetic coil generates magnetic field to control fluid viscosity:

[0176] Magnetic field strength: 0-400 kA / m adjustable;

[0177] Viscosity range: 0.2-500 Pa·s;

[0178] Yield stress: 0-80 kPa;

[0179] Response time: <10 ms.

[0180] 4. Sensing monitoring system:

[0181] 4.1 Force sensor network:

[0182] Type: Piezoelectric force sensor;

[0183] Range: 0-2000 kN;

[0184] Accuracy: 0.1% FS;

[0185] Frequency response: 0-1000 Hz;

[0186] Overload capacity: 150% FS;

[0187] Temperature compensation: -20℃ to +80℃; Number of arrangements: 8-12 per support.

[0188] 4.2 Displacement sensor:

[0189] Type: Magnetostrictive displacement sensor;

[0190] Range: ±500 mm;

[0191] Resolution: 0.01 mm;

[0192] Linearity: ≤0.05% FS;

[0193] Repeatability: ≤0.01 mm;

[0194] Response frequency: ≤2 ms;

[0195] Arrangement: Orthogonal three-way.

[0196] 4.3 Temperature sensor:

[0197] Type: Platinum resistance temperature sensor (PT100); Range: -40℃ to +120℃;

[0198] Resolution: 0.1℃;

[0199] Accuracy: ±0.2°C;

[0200] Response time: ≤1 s;

[0201] Stability: ≤0.02°C / year;

[0202] Number of arrangements: 4-6 per support.

[0203] 4.4 Pressure sensor:

[0204] Type: silicon piezoresistive pressure sensor;

[0205] Range: 0-15 Mpa;

[0206] Resolution: 0.01 Mpa;

[0207] Accuracy: 0.1% FS;

[0208] Overload capacity: 200% FS;

[0209] Temperature compensation: -20°C to +85°C; response time: ≤1 ms.

[0210] 4.5 Acceleration sensor:

[0211] Type: piezoelectric three-axis acceleration sensor; range: ±20 g;

[0212] Resolution: 0.0001 g;

[0213] Frequency response: 0.1-1000 Hz;

[0214] Non-linearity: ≤0.5% FS;

[0215] Lateral sensitivity: ≤3%;

[0216] Operating temperature: -40°C to +85°C;

[0217] Temperature sensitivity: ≤0.02% / °C;

[0218] Overload capacity: 200% FS;

[0219] Response time: ≤0.5 ms;

[0220] Number of arrangements: 6-8 per support;

[0221] Arrangement: orthogonal three-way.

[0222] II. System synergy principle:

[0223] 1. Static working state:

[0224] The intelligent fluid is in a base viscosity state; the valve maintains a preset opening degree;

[0225] The sensor continuously monitors the base data.

[0226] 2. Dynamic response process:

[0227] 2.1 Initial triggering stage of earthquake:

[0228] The acceleration sensor detects seismic waves;

[0229] The displacement sensor monitors the deformation of the support in real time;

[0230] The force sensor monitors the dynamic load changes;

[0231] The control system starts the emergency response mode.

[0232] 2.2 Adaptive adjustment stage:

[0233] The controller calculates the optimal damping based on the monitoring data;

[0234] The piezoelectric valve adjusts the opening degree in real time;

[0235] The electromagnetic coil generates a magnetic field to control the viscosity of the fluid;

[0236] The intelligent fluid flow generates controllable damping force;

[0237] The support stiffness and damping are dynamically adjusted.

[0238] 2.3 Continuous optimization stage:

[0239] Real-time evaluation of shock absorption effect;

[0240] Dynamic optimization of control parameters;

[0241] The system continuously adapts and adjusts;

[0242] Ensures optimal shock absorption performance.

[0243] When an earthquake occurs, the system realizes full-process adaptive adjustment through a complete intelligent sensing and control mechanism. In the initial stage, the acceleration sensor arranged at the key position of the support can quickly capture the arrival of seismic waves, while the displacement sensor and force sensor network immediately start high-frequency sampling mode to obtain the deformation state and dynamic load information of the support in real time. The control system immediately switches to the emergency response state and starts executing the preset rapid response strategy at the moment of detecting abnormal signals.

[0244] After entering the adaptive adjustment phase, the system's core controller, based on real-time collection of multi-dimensional data, runs a specially developed optimization algorithm to calculate the optimal damping parameters in the current state within milliseconds. Subsequently, the control signals are transmitted synchronously to the piezoelectric-driven high-precision valve system and the electromagnetic coil array. The piezoelectric valve can accurately adjust to the target opening within 50 milliseconds, while the controllable magnetic field strength generated by the electromagnetic coil is quickly adjusted within the range of 0-400kA / m, directly acting on the magnetorheological fluid, causing its viscosity characteristics to change accordingly. This synergistic effect enables the intelligent fluid flowing through the support cavity to generate precisely controllable damping force, thereby achieving dynamic optimization of the overall stiffness and damping characteristics of the support.

[0245] During the duration of the earthquake, the system enters the continuous optimization mode. The controller continuously updates and optimizes the control strategy by analyzing the mechanical response characteristics of the support, the displacement trajectory, and the overall shock absorption effect of the structure in real time. The system uses advanced adaptive algorithms to dynamically adjust control parameters according to the changing characteristics of seismic waves, ensuring the safety of the structure while minimizing the impact of earthquakes. This intelligent continuous optimization mechanism ensures that the support always maintains optimal shock absorption performance during the entire earthquake process, providing reliable isolation protection for the upper structure.

[0246] The key to this dynamic response mechanism lies in its highly integrated sensing-control-execution system and intelligent control algorithms developed based on a large amount of experimental data. The system can exhibit excellent adaptability and reliability under different intensity seismic actions, achieving intelligent shock absorption effects that traditional passive isolation bearings cannot achieve. Through precise multi-parameter collaborative control, the system can continuously adjust the damping ratio of the support within the range of 5%-25%, meeting the differentiated needs of different use conditions for isolation performance.

[0247] Dual regulation principle:

[0248] Valve opening adjustment: controls the "channel size" of fluid flow; affects the "speed" of pressure release; only works when there is a pressure difference.

[0249] Magnetic field strength adjustment: directly changes the "internal characteristics" of the fluid; adjusts the "flow resistance" of the fluid; continuously affects the properties of the fluid.

[0250] Therefore, valve opening adjustment is a "passive-active" combination control method. Passive characteristics: requires external force to generate a pressure difference to trigger flow. Active control: can actively adjust the flow size according to demand. Synergistic effect: cooperates with magnetic field strength adjustment to achieve precise control.

[0251] The advantages of this design are: energy saving: no energy consumption in static state; fast response: triggered immediately when earthquake comes; strong controllability: precise control of flow through opening adjustment; wide adjustment range: complementary to magnetic field strength adjustment.

[0252] III. Performance indicators:

[0253] 1. Static performance:

[0254] Vertical bearing capacity: 5000-10000kN;

[0255] Horizontal displacement: ±400mm;

[0256] Vertical stiffness: 1500-2000kN / mm;

[0257] Horizontal initial stiffness: 0.8-1.2kN / mm;

[0258] Equivalent damping ratio: 5-25%(adjustable).

[0259] 2. Dynamic performance:

[0260] Response time: <100ms;

[0261] Control accuracy: ±10%;

[0262] Adjustment range: 2%-30%damping ratio;

[0263] Frequency adaptation: 0.1-10Hz;

[0264] Service life: ≥50years.

[0265] 3. Environmental adaptability:

[0266] Operating temperature: -30℃ to +60℃;

[0267] Environmental humidity: ≤95%RH;

[0268] Protection level: IP65;

[0269] Anti-seismic intensity: 9degree protection.

[0270] The present application adopts a specific formula of magnetorheological fluid as the core medium, and realizes wide range viscosity adjustment of 0.2500Pa·s through magnetic field control. The innovative design of multi-cavity distribution structure (68 cavities) realizes the fast adjustment ability of response time <10ms. The cavities adopt carbon fiber composite material combined with nano alumina and graphene composite coating, which solves the durability problem of traditional supports. The synergistic effect makes the intelligent fluid flowing through the support cavity produce precise controllable damping force, so as to realize the dynamic optimization of the overall stiffness and damping characteristics of the support.

[0271] The present application is not limited to the above-mentioned optional embodiments, and anyone can derive other various forms of products under the inspiration of the present application, but regardless of any changes in shape or structure, any technical solutions falling within the scope defined by the claims of the present application fall within the protection scope of the present application.

Claims

1. A composite thick-laminated rubber seismic isolation bearing with adaptive damping, characterized by: The device comprises an upper connecting steel plate (1) and a lower connecting steel plate (2), wherein a steel plate layer (3), a rubber layer (4), a pressure sensing layer (5) and a sensor network layer (6) are provided between the upper connecting steel plate (1) and the lower connecting steel plate (2), and a plurality of fluid cavities (7) connected by pipes are provided in the rubber layer (4); The fluid cavity (7) is filled with a smart fluid, the formula of the smart fluid including a basic carrier, magnetic particles, a dispersant system and a stabilizer; The pressure sensing layer (5) is provided with an electromagnetic coil, a piezoelectric drive unit and a valve body, the valve body is connected to the fluid cavity (7) through a conduit, the electromagnetic coil is sleeved on the valve body, and the electromagnetic coil and the valve body are respectively electrically connected to the piezoelectric drive unit; The sensor network layer (6) includes a force sensor, a displacement sensor, a temperature sensor for monitoring the external load borne by the support, a pressure sensor and an acceleration sensor for monitoring the internal pressure of the intelligent fluid system; It also includes a control system, and the piezoelectric drive unit, force sensor, displacement sensor, temperature sensor, pressure sensor and acceleration sensor are all electrically connected to the control system.

2. The composite thick-laminated rubber seismic isolation bearing with adaptive damping according to claim 1, characterized in that: The fluid cavity (7) comprises a main cavity, an inner lining anti-corrosion layer is provided in the main cavity, a fluid containing structure is provided in the inner lining anti-corrosion layer, an intelligent fluid fills the fluid containing structure, flow pipes are connected between adjacent main cavities, and the main cavity is provided with a sealing system.

3. The composite thick-laminated rubber seismic isolation bearing with adaptive damping according to claim 2, characterized in that: The material of the main cavity is carbon fiber composite material, the inner lining anti-corrosion layer is nano-alumina + graphene composite coating, the fluid containing structure adopts nanoporous material to construct the microstructure, the material of the fluid containing structure is graphene oxide aerogel, the connecting pipe uses graphene reinforced composite material, and the sealing system includes a fluororubber O-ring as the main seal and a polytetrafluoroethylene dust ring as the secondary seal.

4. The composite thick-laminated rubber seismic isolation bearing with adaptive damping according to claim 1, characterized in that: The smart fluid comprises the following components in parts by weight: Basic carrier: low volatility silicone oil; Magnetic particles: 70-75 parts of spherical carbonyl iron powder; Dispersant system: Main component: oleic acid 23 parts, synergist: sodium dodecylbenzenesulfonate 0.51 parts; Stabilizer: Main component: 12 parts of hydrophobic nano-silica, auxiliary component: 0.3-0.5 parts of organic montmorillonite.

5. A seismic isolation method for a composite thick-layered rubber seismic isolation bearing with adaptive damping, using the composite thick-layered rubber seismic isolation bearing with adaptive damping according to claim 1, characterized in that: The following steps are involved: T1: Static working state: The smart fluid is in the basic viscosity state, the valve maintains the preset opening, and the sensor continuously monitors basic data; T2: Dynamic response process: T21: Initial earthquake triggering stage: The acceleration sensor detects the seismic wave, the displacement sensor monitors the support deformation in real time, the force sensor monitors the dynamic load change, and the control system activates the emergency response mode; T22: Adaptive adjustment stage: The control system calculates the optimal damping piezoelectric valve based on monitoring data and adjusts the opening in real time; the electromagnetic coil generates a magnetic field to control the fluid viscosity; the intelligent fluid flow generates a controllable damping force; the support stiffness and damping are dynamically adjusted T23: Continuous optimization stage: Real-time evaluation of shock absorption effect; dynamic optimization of control parameters; continuous adaptive adjustment of the system to ensure optimal shock absorption performance.

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