27 results about "Viscous damping" patented technology

The utility model discloses a kind of CNG pipe bundle type container shockproof fixed connection structure, it is related to pipe bundle type container technical field, including pipe bundle type container body, the lower surface inside the pipe bundle type container body is fixedly connected with two first fixed seat, the top of two the first fixed seat is evenly provided with second fixed seat, the top of two the second fixed seat is fixedly connected with third fixed seat, the upper surface of two the first fixed seat, the upper and lower two surfaces of two the second fixed seat and the lower surface of two third fixed seat are all set with sliding slot, the inside of each sliding slot is slidably provided with arc clamping block. The utility model passes through the sliding of piston plate in sealing cavity, utilizes the viscous damping force generated by the flow of hydraulic oil through fine hole, cooperates with the elastic reset of spring, can effectively absorb the impact force such as jolt, sudden braking in vehicle driving, to significantly reduce the fatigue crack and sealing element failure risk of CNG gas collecting bottle.

The utility model discloses a kind of viscous damping wall devices for bridge, belong to damping equipment technical field, comprising: movable member is movably inserted in damping wall, damping cavity is provided in the damping wall, damping liquid is provided in the damping cavity, the movable member sliding connection with damping cavity can be with damping liquid and shear motion occurs, the movable member includes the fixed connection of fixed part with bridge superstructure, the fixed part bottom end sliding connection has the plugboard connecting piece that can be along bridge transverse sliding, plugboard connecting piece is fixedly connected with plugboard, the plugboard sliding connection is in damping cavity.The utility model is converted into heat energy dissipation by the internal friction effect between fluid molecules, and the mechanical vibration energy of structure is continuously converted into heat energy dissipation, to effectively reduce the dynamic response of structure.

The present application relates to VR auxiliary debugging and bearing fault positioning technical field, specifically, the present application relates to VR auxiliary debugging and fault positioning method for equipment maintenance, aiming at solving the problem that traditional bearing fault detection adopts visual and static detection, and cannot collect full angle torque dynamic characteristics and large fault positioning error, in the bearing press fitting link, the dynamic torque sensor integrated with the angle encoder is used to collect the instantaneous torque of the full angle, the torque curve of the rotation angle is generated and is associated with the coding storage, when the fault occurs, the measured curve and the standard curve of the same type are called, and are bound to the double virtual bearing model of the VR scene, the virtual driving model is synchronously rotated, the signal module generates the resistance signal according to the torque to control the force feedback data glove, the real rotation feeling is restored by superimposing the viscous damping, the comparison module compares the resistance difference point by point and in the sliding window, if the threshold value is exceeded, the abnormal rotation angle interval is locked, the effective fault area is verified and confirmed through the original point, and the positioning result is output, and the fault positioning precision is improved.

The present application relates to the technical field of material performance testing, and discloses a kind of test methods for evaluating the chemical solvent penetration resistance of reinforced plastic, comprising the following steps: constructing inverse transfer function to compensate platform lag, using historical strain data to predict the starting time of microcrack opening in the next cycle, combining platform inherent delay to calculate instruction sending time, based on stiffness attenuation rate calculated in real time to adaptively adjust the best disturbance frequency, using inverse transfer function to generate modified disturbance instruction and superimposed injection, deducting fluid viscous damping work previously calibrated from single cycle data to obtain effective dissipation density, determining failure end point based on the second derivative change of effective dissipation density sequence.The present application realizes the time synchronization of pressure wave and crack opening through prediction feedforward strategy, maintains deep penetration driving force using adaptive disturbance, and eliminates fluid damping interference through energy decoupling mechanism, improving the authenticity and result accuracy of stress-assisted solvent penetration test.

This invention discloses a construction method for a long-span, low-tower cable-stayed bridge. The method involves installing a variable-stiffness temporary consolidation system, including prestressed steel strands and lockable hydraulic damping cylinders, atop the main pier. Controlled-deflection guide plates are installed on the construction formwork. During typhoon warnings, the guide plates are folded to reduce wind resistance. A servo proportional valve is activated to put the lockable hydraulic damping cylinders into a viscous damping state to dissipate vibration energy. The permanent stay cables are asymmetrically tensioned to actively apply compensating bending moments, achieving coordinated wind resistance. During the semi-floating system transition phase, the prestressed steel strands are cut, and the lockable hydraulic damping cylinders are slowly depressurized, allowing the main beam support reaction force to be smoothly transferred to the movable bearings. Before the mid-span closure, the elevation is precisely adjusted using the slight difference in stroke between the lockable hydraulic damping cylinders on both sides of the main pier. This invention effectively counteracts unbalanced bending moments under extreme wind loads, prevents stress damage to the bottom of the main pier, eliminates stress impacts and abrupt changes in alignment during system transition, and achieves precise closure.

A method for solving the thermal-mechanical coupling multi-scale dynamics of flexible multi-body systems with clearance hinges, the technical field of space deployment mechanism dynamics modeling and numerical simulation. The existing solving method is difficult to accurately capture the change of the dynamics response of the space deployment mechanism under the thermal environment. According to the constructed temperature related hinge gap model, the temperature related material parameter model, the normal contact collision model, the partial slip tangential slip friction model, the tangential total friction force, the adhesion zone displacement and slip velocity model, the thermal viscous damping and tangential friction force model, the static friction growth model and the friction heat feedback transient heat conduction model, the thermal-mechanical coupling mechanical dynamics equation is constructed, which is decomposed into slow field equation and fast field equation, and the slow field equation and the fast field equation are solved through BDF2 and Newton-Raphson method and double parameter adaptive multi-scale implicit integration method, and the motion response of the hinge is obtained. The present application is used for obtaining the motion response of the hinge.

The present application relates to the technical field of rotational speed measurement, and discloses a real-time pressure self-compensation and precise measurement control method for deep-sea rotational speed sensing, which comprises the following steps: collecting the dynamic pressure difference inside and outside a sensing device, inputting the physical property parameters of an updated viscoelastic dynamic response model into a microprocessor, calculating the response time constant representing the phase delay characteristic of an elastic pressure transmission medium according to the parameter value drift characteristic, obtaining an original rotational speed pulse signal with a viscous damping hysteresis characteristic, and constructing a phase compensation filter by using the response time constant, so that the original signal is subjected to a first-order leading phase compensation operation to obtain a calibrated rotational speed measurement value. The present application realizes dynamic mapping of a physical rheological process to signal compensation logic, compensates for the phase bias generated by the high-pressure rheological medium in situ, eliminates the waveform distortion of the pulse signal under the deep-sea extreme pressure working condition, and ensures the measurement stability of the rotational speed sensing system under the variable acceleration rotation working condition of a deep-sea vehicle.

An electric motor includes a stator having a stator core constructed from a ferromagnetic material and having an external stator surface. The stator core includes a stator core body and a plurality of stator teeth extending therefrom. The plurality of stator teeth define conductor slots therebetween. The stator also includes a plurality of stator conductors arranged within the conductor slots. The stator additionally includes a slot liner arranged within each conductor slot and surrounding the corresponding stator conductors. A first gap is established between each stator conductor and the corresponding slot liner, and a second gap is established between each slot liner and the neighboring stator teeth. A predetermined amount of varnish arranged within the first and second gaps to limit an amount of open space within the first and second gaps that is free from the varnish and regulate viscous damping of the electric motor.

The application belongs to the technical field of inner ball cage inspection, and particularly relates to a gap inspection device for an inner ball cage of an automobile universal joint, which comprises an inspection table, and a controller is fixedly connected to the upper side wall of the inspection table. When the axial gap of the inner ball cage of the automobile universal joint is inspected, the rubber dust cover can be pried open and air can be blown inwards, so that the hindrance of the elastic restraint of the rubber dust cover to the axial movement is eliminated, and an annular pressure relief channel is formed between the end face of the inner ball cage and the dust cover. In cooperation with low-pressure air blowing, the accumulated lubricating grease at the raceway and the end face can be effectively loosened and dredged, the viscous damping and the high-pressure oil film effect are reduced, the lubricating grease can be smoothly discharged through the pried open gap, the interference of the lubricating grease and the dust cover on the real axial displacement is greatly reduced, and the accuracy, stability and repeatability of the axial gap detection are significantly improved.

The application discloses a flexible constraint particle damping vibration isolation hammer, which comprises a wire clamp, a steel strand, two hammer heads and multiple partitions, the middle part of the steel strand is connected with the wire clamp, the two hammer heads are arranged at the two ends of the steel strand respectively, the hammer head is a hollow pipe body structure, the two ends of the hammer head are respectively provided with a hammer head end cover, the end part of the steel strand is connected with the hammer head end cover away from the wire clamp after penetrating through the inside of the hammer head, the multiple partitions are vertically fixed on the inner wall of the hammer head and are arranged around the hammer head, a sector cavity is divided between the adjacent two partitions and the inner wall of the hammer head, a group of flexible particle damping units are arranged in each sector cavity, and each group of the flexible particle damping units comprises multiple particles covered by a first flexible constraint material. The flexible constraint particle damping vibration isolation hammer replaces viscous damping with maximum friction damping, realizes low-frequency vibration suppression of the particle vibration isolation hammer on the power transmission line, does not need to be replaced and maintained regularly, and has the advantages of no grease and no pollution.

The utility model relates to the technical field of part machining, and discloses a vibration reduction cutter bar for a numerical control vehicle, an inner cavity of a vibration reduction inner pipe is connected with a pushing disc in a wedging and sliding manner, the middle part of one end of the pushing disc is fixedly connected with a cooperative vibration rod, and the end part of the vibration reduction inner pipe is fixedly connected with a vibration absorption spring; when the tool bit and the tool apron are subjected to vibration force in the machining process, the vibration stress effect is transmitted to the pressure-bearing disc to drive the cooperative vibration rod to move, so that the vibration absorption spring is compressed, the vibration stress is preliminarily buffered, the vibration stress is reduced, and the tool bit and the tool apron are prevented from being damaged. And in the moving process of the cooperative vibration rod, the pushing disc is driven to move along the inner wall of the vibration reduction inner pipe, so that viscous damping liquid in the vibration reduction inner pipe is extruded through the pushing disc, the sealing performance of the connecting position between the cooperative vibration rod and the vibration reduction inner pipe is guaranteed through the sealing sliding seat, and vibration stress is further absorbed.

This invention discloses a multi-stage coupled air chamber type adaptive pneumatic vibration isolation device and its control method. The device includes a three-stage coupled air chamber structure: a main air chamber for bearing the load and providing basic gas spring stiffness; a tuning air chamber for changing the equivalent stiffness of the system through adjustable pressure; and a group of micro-air chambers for generating distributed viscous damping through the flow channels between multiple micro-air chambers. A sensing module is used to collect the vibration time-domain signal of the equipment platform and the pressure data of the air chambers. The controller analyzes the vibration spectrum characteristics through the vibration time-domain signal and generates control decisions based on the pressure data of the main air chamber, tuning air chamber, and micro-air chamber group, as well as a frequency domain divide-and-conquer strategy: if it is low-frequency vibration, it outputs a tuning air chamber pressure adjustment command; if it is high-frequency vibration, it outputs a micro-air chamber piezoelectric valve opening command. The execution module responds to the command, adjusting the pressure of the main air chamber, the pressure of the tuning air chamber, or the connection state between the micro-air chambers in the micro-air chamber group to achieve dynamic matching of system stiffness and damping.

The application provides an assembled composite damping self-resetting support capable of realizing output protection, which is composed of multiple independent modules through external pipe connectors, and comprises a speed-sensitive damping module, a displacement-sensitive damping module, a reset module and an output protection module. The modules are connected through bolts, which greatly reduces the initial defects and the adverse effects of welding stress. The assembly can be independently processed and transported to the construction site for integrated assembly, which greatly improves the production construction efficiency and is convenient for post-earthquake repair. The damping energy dissipation module of the component is composed of the displacement-sensitive damping module and the speed-sensitive damping module. The displacement-sensitive damping module is composed of a metal yield energy dissipation module or a friction energy dissipation module, and the speed-sensitive damping module is composed of a viscoelastic damping module or a viscous damping module, which ensures that the component can effectively reduce the acceleration response of the structure while providing stable energy dissipation.

The present application belongs to the technical field of seismic performance-based design of building structure, and relates to a seismic performance-based design method for light ribbed thermal insulation wall. A regression or semi-theoretical relationship between the ductility coefficient, equivalent viscous damping coefficient, ultimate inter-story drift angle, axial compression ratio, wall height-width ratio, panel thickness, rib column number and longitudinal reinforcement ratio of the light ribbed thermal insulation wall is established to construct a multi-parameter performance design atlas. In the design, the target ductility, equivalent damping and displacement angle indexes are given by the seismic fortification intensity and target performance, the parameter combination satisfying the target is back calculated in the five-dimensional design space, and economic optimization is carried out under the premise of meeting the bearing capacity, construction and energy saving requirements, and seismic checking calculation is completed by using a simplified hysteresis model or an equivalent single degree of freedom model. The present application realizes the transformation of light ribbed thermal insulation wall from "empirical construction" to "performance-based parameter design", and can significantly improve the seismic safety and design economy.

This invention discloses an auxiliary straightening device and method for cable processing, belonging to the technical field of cable manufacturing and processing equipment. The device includes: S1, constructing a drive structure: setting up a base platform and a hollow guide spindle; a linkage adjustment ring with an Archimedean spiral guide groove is sleeved outside the spindle; and a closed-loop stepper motor is used to drive the rotation of the linkage adjustment ring, with an elastic floating straightening component embedded inside; S2, locking the physical zero point; S3, calculating the matching feed amount; S4, performing dynamic straightening: the drive motor rotates relative to the physical zero point position by the target number of pulse steps, forcing the floating piston to compress the variable stiffness damping spring to apply pressure; during the straightening process, viscous damping grease filled between the slider base and the floating piston is used to dissipate vibration energy. This invention establishes a calculation benchmark by real-time monitoring of the contact state, ensuring the consistency of straightening pressure for different batches of cables and solving the quality fluctuation problem caused by human operation in traditional methods.

The present application relates to biomedical micro-electro-mechanical system and intelligent micro-fluidic technology field, especially to a PICC catheterization complication intelligent early warning and automatic intervention system, including the following modules: in situ multimodal perception module, stochastic resonance calculation early warning module, adaptive stiffness tuning module, bistable pulse excitation module and acoustic metamaterial rectification module. The perception module uses piezoelectric film and fiber Bragg grating to solve the fluid viscous damping coefficient in real time; the early warning module calculates the target barrier height according to the blood flow background noise and generates intervention instructions; the tuning module adjusts the bistable skeleton stiffness through shape memory alloy to match the barrier; the excitation module uses random resonance to drive the skeleton to occur nonlinear jump and generate high-energy pressure shock wave; the rectification module uses acoustic band gap to reflect the near-end shock wave to realize one-way fluid pulse output. The present application uses weak biological energy to break through the high viscous fluid boundary layer damping, realizes the valveless directional physical removal of the micro-attachment in the catheter.

The present application relates to VR auxiliary debugging and bearing fault positioning technical field, specifically, the present application relates to VR auxiliary debugging and fault positioning method for equipment maintenance, aiming at solving the problem that traditional bearing fault detection adopts visual and static detection, and cannot collect full angle torque dynamic characteristics and large fault positioning error, in the bearing press fitting link, the dynamic torque sensor integrated with the angle encoder is used to collect the instantaneous torque of the full angle, the torque curve of the rotation angle is generated and is associated with the coding storage, when the fault occurs, the measured curve and the standard curve of the same type are called, and are bound to the double virtual bearing model of the VR scene, the virtual driving model is synchronously rotated, the signal module generates the resistance signal according to the torque to control the force feedback data glove, the real rotation feeling is restored by superimposing the viscous damping, the comparison module compares the resistance difference point by point and in the sliding window, if the threshold value is exceeded, the abnormal rotation angle interval is locked, the effective fault area is verified and confirmed through the original point, and the positioning result is output, and the fault positioning precision is improved.

This application relates to the field of vibration reduction technology for long-span bridges, and provides a vertical ultra-low frequency stacked spring viscous damping adjustable inertial capacity tuned mass vibration damper. The damper includes a mass block, a helical steel spring, a damping device, a transverse support, a sleeve, a ball screw, and a flywheel. The helical steel spring is located between the horizontal support and the base, and the damping device is located between the mass block and the base. The sleeve is rotatable and located on the transverse support, with an embedded ball screw nut. The ball screw screw passes vertically through the ball screw nut and is connected to the mass block. A base plate is located on the upper part of the sleeve. The flywheel is composed of multiple sets of mass discs of different thicknesses stacked together. The uppermost mass disc has a replaceable micro-block for frequency fine-tuning. This application can progressively reduce the operating frequency of the TMD (tunable damper) through the stacked spring and inertial capacity mass, achieving ultra-low frequency control below 0.1Hz. It has advantages such as low inertial capacity mass requirement, flexible adjustment, high frequency adjustment accuracy, low starting resistance, convenient damping ratio adjustment, and compact structural layout.

The application discloses a tunnel anti-seismic energy-dissipation anchor rod and a mounting method, and belongs to the technical field of tunnel engineering anti-seismic technology. The anchor rod comprises an anchor rod body and a viscous damper. The viscous damper comprises a steel sleeve shell, a push rod piston, a high-strength spring and viscous damping liquid. The push rod piston is arranged in the steel sleeve shell, and the push rod passes through the tail of the shell and is threadedly connected with the anchor rod body. The high-strength spring is sleeved on the push rod and connected with the piston. The head of the shell is connected with a bolt, the bolt passes through a tray and is fixed on a tunnel lining structure. During an earthquake, the high-strength spring and the viscous damping liquid can absorb energy, reduce the deformation and deformation rate of the tunnel structure, and gradually reset after the earthquake. The application is suitable for reinforcing new and existing tunnels, and has the advantages of good anti-seismic performance, flexible installation and convenient transportation.

The application discloses an assembled plug-in plate viscous damping wall and relates to the technical field of viscous damping walls.The assembled plug-in plate viscous damping wall comprises a viscous damping wall, an upper connecting assembly, a range-increasing transmission assembly, a first adjustable connecting assembly, a second adjustable connecting assembly and a quick-mounting pin shaft assembly.The range-increasing transmission assembly is connected with a first lug, a third lug and a fourth lug and is used for transmitting the small displacement of the upper connecting plate to a metal shear plate so as to realize the large displacement between the metal shear plate and an outer steel box.The small displacement of the upper floor can be mechanically enlarged and then transmitted to the metal shear plate through the range-increasing transmission assembly, so that the metal shear plate can still obtain a larger shearing stroke and a movement speed under the small displacement excitation of wind vibration or a small earthquake, the energy consumption capacity of the viscous damping material is fully stimulated, the damping effect of the damping wall under the slight vibration is greatly improved, and the replacement efficiency of the range-increasing transmission assembly is greatly improved through the quick-mounting pin shaft assembly.

This application discloses a floating semi-submersible platform and an offshore power generation system. A heave assembly is connected to the bottom of the platform component. The heave assembly includes at least two sets, each set having at least two heave plates arranged from top to bottom. The vertical movement of the heave assembly increases added mass and provides viscous damping, dissipating the platform's kinetic energy in the vertical direction and reducing the amplitude of the platform's vertical movement. The platform component and the heave assembly are connected by a universal joint with at least two degrees of freedom, allowing the heave assembly to generate angular displacement relative to the platform component in at least two directions. Thus, in the event of roll or pitch, the angular displacement generated by the heave assembly relative to the platform component creates an inertial torque opposite to the platform's sway direction, reducing the platform's sway on the horizontal plane, improving the platform's ability to suppress complex loads, and enhancing the platform's stability.

The application discloses a self-resetting anti-seismic energy-dissipation anchor rod and an anchoring method, and belongs to the technical field of anti-seismic geotechnical engineering. The anchor rod comprises a viscous damper and an anchor rod, and the two are in a separated modular structure. The head of the viscous damper is fixed in a concrete structure through a pre-embedded part and a bolt, and the tail thereof is connected with the anchor rod body. The anchor head of the anchor rod is provided with double-layer elastic anchor pieces with concave curvature, and is reinforced in cooperation with injected anchoring slurry. During an earthquake, the high-strength spring and viscous damping liquid in the viscous damper are cooperatively energy-dissipated, so that the structural deformation and speed are effectively reduced; after the earthquake, the high-strength spring drives the anchor rod to self-reset, thereby reducing residual deformation. The application has the advantages of high anti-seismic energy-dissipation efficiency, self-resetting after the earthquake, reliable anchoring, strong applicability of the modular design and the like, and is suitable for anti-seismic reinforcement of geotechnical engineering such as tunnels and slopes.

The application discloses a peristaltic impeller composite self-priming pump and relates to the technical field of non-variable volume pumps. The peristaltic impeller composite self-priming pump comprises a driving motor, a peristaltic pump part and an impeller pump part. The power output shaft of the driving motor penetrates the peristaltic pump part and the impeller pump part in sequence. The central transmission wheel of the peristaltic pump part is transmissionally coupled with the power output shaft through viscous damping grease. The end part of the power output shaft is fixedly connected with the impeller of the impeller pump part. The water suction end of the peristaltic pump part is communicated with the pump cavity of the impeller pump part, and the water outlet end of the peristaltic pump part is communicated with the water outlet pipe of the impeller pump part. The water outlet pipe of the impeller pump part is provided with a one-way valve, which is located between the water outlet end of the peristaltic pump part and the water outlet end of the impeller pump part and only allows fluid to be conducted in the water outlet direction. The peristaltic impeller composite self-priming pump combines the anti-blocking and self-priming characteristics of the peristaltic pump with the large flow and mute characteristics of the impeller pump, is a functional combination of two pump bodies and is a composite pump with complementary short boards.

This invention relates to a method for error compensation and adaptive unified modeling of dynamic testing of metal rubber based on harmonic characteristics. The method includes: calibrating system time error and phase deviation using standard components; extracting the dominant frequency and harmonic characteristics of the displacement spectrum through pre-tests, constructing an excitation error compensation model and generating a compensation waveform to suppress resonance distortion; preprocessing the response data after the formal test; adaptively determining the Chebyshev series order based on the amplitude tolerance threshold of the force spectrum; and finally using the Chebyshev series to construct a unified mathematical model including elastic components, viscous damping components, and inviscous damping components. This invention can effectively eliminate test system errors and excitation rebound errors, achieving automated and standardized modeling of the dynamic characteristics of metal rubber, and significantly improving the model's versatility and engineering applicability.