226 results about "Viscous damping" patented technology

The utility model relates to a high-performance sealed viscous damping wall, and belongs to the technical field of civil engineering structures. Comprising steel frames, gapless spherical hinges, bushings, piston rods, pistons, oil cylinders, extension pipes, experiment connecting holes, shells, lug plates and embedded parts, the steel frames are arranged on the left side and the right side of the high-performance sealed viscous damping wall, the inner sides of the steel frames are symmetrically and fixedly connected with two or more sets of gapless spherical hinges, and viscous dampers are arranged between every two sets of gapless spherical hinges. The viscous damping wall has the beneficial effects and advantages that the viscous damping wall adopts a completely sealed structure, so that the pollution of silicone oil is avoided, and the durability of a product is ensured; the damping wall is easy to install on site, and the damping wall can be rotationally and obliquely installed according to the actual situation on site; an experiment table connecting hole is formed in the steel frame side plate, so that the non-destructive experiment of the viscous damping wall is realized; and the multiple groups of viscous dampers are connected with the steel frame through the gapless spherical hinges, so that the good cooperative work performance is achieved.

The invention relates to the technical field of hydrodynamic analysis of ship and ocean engineering, in particular to a method, a device and equipment for predicting an additional mass coefficient and a viscous damping coefficient of multi-degree-of-freedom movement of a floating body, a storage medium and a computer program product. The method comprises the following steps: performing orthogonal two-dimensional slicing on each plane to generate flow field sampling points based on a floating body three-dimensional geometric model, draft and motion parameters; sampling point coordinates, initial flow field data, geometric contour discrete points, boundary conditions and motion parameters are coded into high-dimensional feature vectors through a learnable matrix, and input matrixes of all planes are constructed; predicting two-dimensional flow field data by adopting a Transform module, fusing multi-plane data through a graph attention network to generate a redundant three-dimensional flow field, and interpolating and complementing object plane missing points; the water pressure and the viscous shear force are divided along the surface area of the floating body, the inertia term and the damping term are decomposed in combination with the single-mode motion equation, the target additional mass coefficient and the target viscous damping coefficient are determined, and the accuracy of floating body hydrodynamic calculation is improved.

The invention discloses an anti-seismic protection structure of a coral island reef limestone underground chamber and a construction method.The anti-seismic protection structure of the coral island reef limestone underground chamber comprises a chamber hole, an elastic shock insulation layer, a pouring layer, a shock insulation support, a viscous damping component and a mild steel damper; the seismic isolation support and the pouring layer bear vertical loads together, the viscous damping component and the side wall bear lateral confining pressure of reef limestone, under the earthquake effect, the elastic seismic isolation layer can preliminarily absorb earthquake energy, and after three-direction seismic waves are transmitted to the structure, the seismic energy of X-direction seismic waves and Y-direction seismic waves is consumed by the seismic isolation support at the bottom layer through vibration and friction, so that the seismic isolation effect is achieved. X-direction and Y-direction deformation and displacement of the chamber are reduced, Z-direction seismic waves absorb seismic energy through the seismic isolation support, so that energy continuously transmitted to the upper portion is avoided or reduced, and the vertical vibration response of the structure is relieved. At the arch crown part, the mild steel damper can absorb and dissipate energy through vibration and plastic deformation of an energy dissipation component arranged on the mild steel damper.

The invention discloses a high-performance sealed viscous damping wall. The high-performance sealed viscous damping wall comprises a viscous damper, the steel frames are symmetrically arranged at the two ends of the viscous damper, and the outer side of each steel frame is fixedly connected with a lug plate; the embedded part is arranged on the wall body, a setting hole is formed in the lug plate, and the inner wall of the top hole is connected with the outer wall of the embedded part in a sliding mode and is fixed to the embedded part through a fixing cap in a threaded mode; the gapless spherical hinges are arranged at the joints of the two ends of the viscous damper and the steel frame, and hinge joint of the viscous damper and the steel frame is achieved; the invention belongs to the technical field of civil engineering structure damping walls, and achieves the technical effects that vibration mechanical energy is efficiently converted into heat energy to be dissipated through nonlinear damping force generated when damping liquid in the viscous damper flows through a piston throttling hole, the acceleration and displacement response of the structure are greatly reduced, and the damping effect is good. And the hot zinc spraying and paint anti-corrosion layer ensures long-acting service in a severe environment.

The double-step high-performance sealed viscous damping wall comprises a viscous damper and steel frames installed at the two ends of the viscous damper, the outer sides of the steel frames are fixedly connected with lug plates, embedded parts are arranged on the side walls of the lug plates, and the two ends of the viscous damper are hinged to the steel frames through gapless spherical hinges; the viscous damper comprises an oil cylinder, a piston and a piston rod, and the oil cylinder is filled with damping liquid; a variable cross-section structure is arranged on the inner wall of the oil cylinder, so that the middle circulation cross section is larger than the cross sections at two ends, and intelligent grading regulation of damping force along with piston displacement is realized; the invention belongs to the technical field of civil engineering damping walls, and achieves the technical effects that the groove is machined in the middle of the oil cylinder, a double-step energy dissipation mechanism is constructed, when a piston moves in the range of the groove, silicone oil can flow through double channels of the enlarged radial gap and the communicating hole, the piston moves to break through the boundary of the groove due to an earthquake, and the damping effect is achieved. And the gap between the piston and the oil cylinder is compressed instantly, so that the comfort under small earthquakes is guaranteed, and high-efficiency dissipation of pulse energy during large earthquakes is ensured.

The invention provides a high-energy-consumption viscous damping device. Relates to the technical field of building anti-seismic equipment, and comprises an upper plate body and a lower plate body, and a damping mechanism is arranged between the upper plate body and the lower plate body; the damping mechanism comprises an oil cylinder, a fixing plate is fixedly installed in the oil cylinder, a second sealing piece is arranged on one side of the fixing plate, a piston rod is arranged on the inner side of the oil cylinder in a sliding mode, a first piston is fixedly installed on the outer side of the piston rod, the first piston is matched with the oil cylinder, and the first piston is tightly attached to the inner wall of the oil cylinder. A plurality of oil storage cavities are formed in the two sides, away from the center position, of the inner wall of the oil cylinder, liquid guide grooves are formed in the inner wall of the oil cylinder, the oil storage cavities communicate with the inner side of the oil cylinder through the liquid guide grooves, an oil storage barrel is arranged on the outer side of the oil cylinder, and a connecting pipe is fixedly installed at one end of the oil storage barrel. The high-energy-consumption viscous damping device has the advantages of being convenient to install, good in anti-seismic and energy-absorbing effect and stable in damper performance.

The present invention provides a viscous damping device based on displacement amplification. It belongs to the technical field of building seismic equipment, and includes: a lower mounting plate, an upper mounting plate and a viscous damper. The viscous damper is installed between the lower mounting plate and the upper mounting plate. Two lower node plates are fixedly installed on the top of the lower mounting plate, and two upper node plates are fixedly installed on the bottom of the upper mounting plate. A first fixed plate is rotatably installed between the two lower node plates. The viscous damper is rotatably installed on the first fixed plate, and a connecting arm located above the viscous damper is fixedly installed on the first fixed plate. The viscous damping device based on displacement amplification provided by the present invention has the advantages that the viscous damper can obtain an enhanced energy dissipation effect even under a relatively small displacement condition, improves the shock absorption performance of the building under the action of an earthquake, facilitates relevant personnel to obtain the operating conditions of the viscous damper at the epicenter, and is reliable to use.

The present invention relates to a high-speed flexible coupling, comprising a transmission shaft, the end of which is connected to a flexible member and an adapter from the inside to the outside; a deformation ring groove is provided in the axial middle of the flexible member, dividing the flexible member into an inner end face and an outer end face; a screw hole for connecting the outer end face of the flexible member and a pin hole for the outer end face of the flexible member are drilled in the outer end face of the flexible member; an outer end center deformation groove and an outer end surrounding deformation groove are provided in the outer end face of the flexible member, and the outer end center deformation groove passes through the middle of the outer end face of the flexible member. The present invention has a simple structure and a small number of parts; it can compensate for radial and angular misalignment between the output shaft and the input shaft. At the same time, a locating pin is used for connection, so that there is no gap or idle stroke when the torque is transmitted between the input shaft and the output shaft, and the torque transmission is more stable and impact-free. When an unexpected axial impact occurs in the system, the limit pin can play an axial limiting function, protecting the flexible member from damage, thereby increasing the service life of the coupling.

The invention discloses viscous damping loop flannelette and a preparation method thereof, the preparation method comprises the following steps: S1, fabric preparation: preparing filament polyester fibers for preparing a loop flannelette fabric, using filament polyester fibers or polyamide fibers as middle connecting yarns, and using polyester or polyamide fibers as loop flannelette yarns; s2, warping treatment: performing warping treatment on the yarns selected in S1 to ensure the flatness of the yarns and smooth proceeding of subsequent weaving; s3, knitting: knitting by adopting a plaiting and lining terry structure knitting technology, and combining yarns into the loop flannelette with a specific structure. According to the invention, a layer of water-drop-shaped viscous substance is uniformly formed on the loop suede surface of the loop flannelette through the process means such as spraying or printing, and the layer of viscous substance enables the loop flannelette to have a viscous damping effect; when the whole grinding material is held by hand for use, the friction force can be increased, and the conditions of slipping and slipping are remarkably reduced, so that the grinding efficiency is effectively improved.

The invention belongs to the technical field of vibration control and isolation, and discloses a stepless self-adaptive large-range load quasi-zero stiffness vibration isolation platform and a use method.The use method comprises the steps that the load and motion state is monitored in real time through a stepless variable load vibration isolation supporting leg binding force sensor and an acceleration sensor, and after being processed by a signal conditioning module, the load and motion state is output; the passive grading quasi-zero stiffness system and the electromagnetic constant force module are regulated and controlled by the semi-active controller, so that stepless self-adaptive adjustment of a large-range load is realized; the passive grading system provides stepped load bearing, the electromagnetic constant-force module realizes stepless adjustment in a hierarchy, and the passive grading system and the electromagnetic constant-force module are combined to cover a wide-area load demand; the linear bearing reduces friction, viscous damping consumes vibration energy, the quasi-zero stiffness vibration isolation characteristic can be effectively exerted, the vibration isolation effect is improved, the application range is widened, and the vibration isolation device is suitable for vibration isolation in various load scenes.

The invention discloses an industrial mechanical arm joint rigidity online identification method based on an optimal excitation track, and belongs to the field of mechanical arm parameter identification. The method comprises the following steps: firstly, establishing a mechanical arm rigid-flexible coupling dynamic model, and constructing a linear regression equation taking joint rigidity and viscous damping as parameters; a Fisher information matrix is derived based on the regression model to quantify the amount of information of the excitation trajectory. And further, parameterizing the excitation trajectory by using finite term Fourier series, and solving the optimal excitation trajectory by using a scalar index of a Fisher information matrix and a sustainable excitation condition as optimization targets under the condition of meeting joint motion constraints. And finally, the mechanical arm is driven to execute the track, motion data are collected and input into parameter identification algorithms such as unscented Kalman filtering and recursive least square, and online and high-precision estimation of the time-varying joint stiffness is achieved. According to the method, the excitation track is designed directly from the information theory, and the precision, robustness and real-time performance of joint rigidity identification are effectively improved.

The invention belongs to the technical field of damping walls, and particularly relates to a novel high-performance viscous damping wall which comprises a channel steel box used for containing viscous liquid and arranged between an upper damper connecting wall pier and a lower damper connecting wall pier and a damping body vertically placed in the channel steel box and connected with the damper connecting wall piers. A plurality of metal plates are arranged in the vertical direction of the channel steel box in an array mode, and anti-deformation mechanisms movably connected with the two ends of the bottoms of the metal plates in a sleeving mode are arranged on the side faces of the two ends of the inner bottom of the channel steel box. According to the novel high-performance viscous damping wall, through the arrangement of the anti-deformation mechanism, when the damping wall is subjected to vibration in different directions or the instantaneous vibration deformation force is too large, the metal plate can elastically displace in time in the thickness direction of the channel steel box, and the problem that the metal plate is in rigid contact with the damping body and deforms is solved.

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 invention provides a viscous damping device based on efficient heat dissipation, and belongs to the field of building anti-seismic equipment. The damper comprises a viscous damping assembly, an upper gusset plate and a lower gusset plate, the viscous damping assembly comprises a cylinder body, a piston rod, two bushings and a piston, the upper gusset plate is hinged to the end, located outside the cylinder body, of the piston rod, an upper mounting plate is fixedly mounted at the top of the upper gusset plate, and a connecting body is fixedly mounted at the end, away from the upper gusset plate, of the cylinder body; the lower gusset plate is hinged to the end, away from the cylinder body, of the connecting body, a plurality of heat conduction rods distributed in an annular array are slidably installed on the piston in a penetrating mode, and a plurality of natural graphite flakes are fixedly installed on the positions, close to the two ends, of the outer walls of the heat conduction rods. The viscous damping device based on efficient heat dissipation has the advantages that an efficient passive heat dissipation link is arranged in the cylinder body, active one-way auxiliary heat dissipation can be achieved, a heat dissipation fin convenient disassembly and maintenance structure is arranged, and the telescopic amplitude of the piston rod can be accurately recorded.

The utility model discloses a turbo type viscous damper, which relates to the technical field of building construction, and comprises an oil cylinder structure and turbo type piston structures, a piston rod is horizontally arranged in the oil cylinder structure, and the turbo type piston structures are arranged at one end of the piston rod and are provided with two groups. According to the turbo type viscous damper, two sets of turbo type piston structures are installed at one end of the piston rod, the structural arrangement of two sets of turbine blades is utilized, and a sealing ring is installed on the surface of a supporting ring in a matched mode; while the high-damping bearing provides axial rotation activity for the whole turbo type piston structure, sufficient structural viscous damping performance can be provided for the whole device through cooperative use of the structures, and interference protection of damping buffering can be further provided for the whole device through structural arrangement of the pressure accumulation structure and the control valve; and the stability and the service life of the device are ensured.

The utility model relates to the technical field of anti-vibration, and discloses a high-damping anti-vibration seat of integrated circuit equipment, which comprises an anti-vibration seat and a base. According to the high-damping anti-vibration seat of the integrated circuit equipment, through the arrangement of the supporting seat, the base, the damping mechanism and the elastic mechanism, when the integrated circuit equipment is vibrated, the acting force borne by the supporting seat can be transmitted to the piston rod, the piston rod is forced to vibrate, and magnetorheological fluid is pushed to flow in the annular cavity; a magnetic field generated by the permanent magnet array enables magnetorheological fluid particles to form a chain-shaped structure, fluid shear stress is greatly increased, nonlinear viscous resistance is generated, meanwhile, vertical reciprocating motion of the piston rod cuts magnetic induction lines of the permanent magnet array, an eddy current effect is triggered, reverse electromagnetic damping force is generated, and the damping effect is improved. Therefore, magnetic circuit cutting and fluid extrusion are achieved while movement of the piston rod is achieved, a composite energy dissipation mechanism of electromagnetic damping and viscous damping is formed, and the energy dissipation efficiency and the resonance peak suppression efficiency are remarkably improved.

The invention relates to the technical field of constructional engineering, in particular to a self-adaptive viscous damping vibration isolation device for the bottom of a music hall base, comprising a floating bearing layer, a damping adjusting layer and a base connecting layer which are sequentially arranged from top to bottom from the bottom of a building; through the synergistic effect of the floating bearing layer, the damping adjusting layer and the base connecting layer, self-adaptive vibration isolation of music hall base vibration is achieved, and preliminary buffering is provided for vibration through sliding fit of the floating bearing layer; in the damping adjusting layer, a damping cylinder can automatically adjust damping according to the magnitude of vibration through cooperation of inertia of a plugging piece and an elastic piece without additional control, low damping is kept during small vibration to avoid excessive constraint, damping is increased during large vibration to efficiently isolate vibration, the adaptability and accuracy of vibration isolation are ensured, electric drive or a complex control system is not needed, and the cost is reduced. The structure is reliable, maintenance is easy and convenient, continuous and stable work can be achieved under different vibration working conditions, and reliable vibration isolation guarantee is provided for creating a stable acoustic environment for a music hall.

The present invention relates to a nonlinear evaluation method and medium for the horizontal low-cycle characteristics of a bracket based on an automatic contact pair generation strategy. The method uses the automatic contact pair generation strategy to determine the contact relationships between various geometric bodies in the bracket structure. Based on the determined contact relationships and in combination with the bracket material properties, the stress-strain relationship is determined. Yield behavior and plastic strain are determined based on plastic mechanics theory and related criteria. Failure modes are determined based on damage mechanics theory, and then a damage evolution equation is defined and damage correction is performed to accurately assess material damage. Based on the analysis results of the material properties, a consistent tangent stiffness matrix and an accordion ratio matrix are obtained to complete the evaluation of the bracket's mechanical properties under horizontal low-cycle characteristics. Compared with existing technologies, the present invention can effectively capture the damage evolution and displacement patterns of the bracket during low-cycle repeated stress. The errors in the hysteretic overall envelope area, secant stiffness error, equivalent viscous damping coefficient, hysteretic energy dissipation, and elastic recovery energy are all small.

The invention discloses a sound insulation and noise reduction decorative sheet, which comprises a soft marine phase structure and an island phase structure, wherein the soft marine phase structure takes 2-carbon, 3-carbon, 4-carbon and n-carbon elastomer / resin / rubber as a base material; the island phase structure takes natural or synthetic inorganic / organic filler or a mixture of the natural or synthetic inorganic / organic filler; the island phase structure filler is distributed and filled in the marine facies structure in different structural shapes, and a microstructure which reflects and absorbs sound waves for multiple times is formed between the island phase structure filler and the marine facies structure layer. The sound insulation coiled material has the beneficial effects that energy in noise is absorbed and converted into heat energy by utilizing the viscous damping effect of a soft high polymer material in the marine phase on sound waves, and the sound waves are reflected by a hard structure in the island phase, so that the noise is reflected and absorbed for multiple times in the micro island structure of the sound insulation coiled material, and the noise reduction effect is achieved; the problem that a traditional polyurethane sound insulation material needs to reach the thickness of 3-5 cm to achieve a good sound insulation effect is solved, and when the thickness is reduced to 2.5 mm, the good sound insulation effect can be achieved without causing space loss.

This invention discloses a piezoelectric tuned mass rate-independent damper and its parameter design method. Compared to traditional tuned mass dampers, the original linear viscous damping element in the damper is replaced with a rate-independent linear damping element, thereby providing a damping force independent of vibration frequency. Furthermore, after replacing the damping element, in order to optimize the piezoelectric tuned mass rate-independent damper's effect on the displacement response of the structure under seismic load excitation, the invention proposes a parameter optimization design method for the piezoelectric tuned mass rate-independent damper based on the displacement transfer function of the main structure and the ground motion, with the goal of minimizing the peak displacement response of the main structure.

The anti-seismic drawing equipment based on liquid buffering comprises a drawing device, a working chamber, a first buffering chamber and a second buffering chamber, the drawing device is arranged in the working chamber, the working chamber is suspended in a buffering solution of the first buffering chamber, and the first buffering chamber is arranged in the second buffering chamber in a vacuum state; the working chamber is suspended in a buffer solution, high-frequency and large-amplitude impact instantaneously generated in the drawing process can be efficiently absorbed by utilizing viscous damping and density characteristics of the liquid, and the anti-seismic effect is improved; meanwhile, the vacuum state of the second buffer chamber can effectively obstruct sound transmission, vibration transmission is reduced in cooperation with the nested structure, the defect that a traditional sound insulation cover cannot obstruct low and medium frequency noise is overcome, the influence of high-strength noise generated by drawing operation on the surrounding environment is greatly reduced, and the sound insulation effect is improved. And the stability and the environmental protection property of equipment operation can be improved while the test precision is ensured.

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.

According to the invention, a method for determining the service life condition of a vibration damper (1), in particular a torsional vibration damper or shock absorber, comprises a main mass and a secondary mass, and a working chamber arranged between the main mass and the secondary mass, the working chamber being filled with a viscous damping medium, wherein the vibration damper (1) is arranged on a crankshaft (7) of an engine (8), in particular an internal combustion engine, and in order to suppress or eliminate torsional vibrations of the crankshaft (7), the crankshaft (7) constituting a part of the engine (8) is designed to have the following steps when operating the engine (8): S1) operating the engine (8); S2) determining at least one operating parameter of the engine (8); S3) simulating the temperature distribution of the viscous damping medium in the working chamber; and S4) determining the service life condition of the vibration damper (1) based on the operating parameter of the engine (8) and the result of simulating the temperature distribution of the viscous damping medium. Components for carrying out the method are also provided.

An electric motor includes a stator having a stator core made of a ferromagnetic material and an outer 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 further includes a plurality of stator conductors disposed in the conductor slots. The stator additionally includes a slot liner disposed in each conductor slot and surrounding the corresponding stator conductors. A first slot is formed between each stator conductor and the corresponding slot liner, and a second slot is formed between each slot liner and the adjacent stator teeth.A predetermined amount of varnish disposed in each of the first and second slots to limit the size of the open space within the first and second slots that is free of varnish and to regulate the viscous damping of the electric motor.

The invention provides a wood structure truss type reinforcing system with composite energy consumption and self-resetting, which belongs to the technical field of ancient building wood structure reinforcement and comprises a wood upper cross beam, a wood lower cross beam, a viscous damping device, a spring device and a friction energy consumption device. The additional wooden upper cross beam is rigidly connected with the common square columns on the two sides, so that the transverse rigidity and integrity are remarkably enhanced, and weak links at the joints of the bracket set and the common square columns are eliminated; through cooperative work of a plurality of adjustable viscous damping devices, spring devices and friction energy dissipation devices, the energy dissipation capacity is improved in a grading mode, and meanwhile the swinging and self-resetting functions of the wooden column are reserved.

The application discloses a method for calculating alcohol concentration based on secondary compensation, and relates to the technical field of alcohol concentration detection. The application innovatively introduces fluid viscous damping characteristics as a third measurement dimension, uses the driving gain parameter of the Coriolis force mass flowmeter to inversely calculate the actual viscosity of the fluid in real time, and breaks the single measurement limitation of the traditional density and temperature. Meanwhile, the physical characteristics of the solid in the brewed wine are extremely sensitive to the viscosity, the dry extract content in the wine is accurately inversely estimated based on the viscosity deviation, the density virtual high value caused by the solid is further quantitatively calculated, and the measured density is subtractively corrected. Through the secondary compensation mechanism, the interference of the solid is effectively removed, and the real density of the pure base liquor is restored.

The invention discloses a waterproof steel spring vibration isolator inner sleeve with a high damping ratio and a design method, and particularly relates to the technical field of vibration isolators, the inner sleeve comprises an inner top plate, a bottom plate, a spring and a damping agent, and is characterized in that an inner sleeve heightening rod is arranged in a vertical space on the inner side of the spring in a middle shaft area of the inner sleeve; the upper end of the inner cylinder heightening rod is welded to the inner top plate, and the lower end of the inner cylinder heightening rod is inserted into a lower blocking pipe of the bottom plate filled with the damping agent, so that a built-in piston-oil cylinder type viscous damping cavity is formed.

The invention discloses an enclasping type damper and a rear derailleur. The enclasping type damper comprises a shell; the main shaft is rotationally connected with the shell around the axis of the main shaft, and a tensioning elastic piece is arranged between the main shaft and the shell; damping grease capable of generating a viscous damping effect is filled between the inner circumferential surface of the sleeve and the outer circumferential surface of the main shaft; the locking spring is provided with a fixed end and a free end and spirally extends to the free end from the fixed end in the axis direction of the main shaft, and when the sleeve rotates in the first rotating direction relative to the shell, the fixed end rotates along with the sleeve in the first rotating direction and forces the locking spring to expand in the radial direction; and the locking spring outwards supports the inner circumferential surface of the shell and prevents the fixed end and the sleeve from continuously rotating along the first rotating direction. The clasping type damper is obvious in one-way damping effect, rapid in damping response, capable of preventing chain falling, free of influence on normal gear shifting and speed changing of a rear derailleur, ingenious in structural design and low in requirement for later maintenance, machining and installation precision.

The invention relates to the technical field of knee joint exoskeleton devices, in particular to a viscous damping knee joint exoskeleton device. The knee joint assembly comprises a first rotating assembly and a second rotating assembly which are rotationally connected; the pair of leg connecting assemblies are connected with the first rotating assembly and the second rotating assembly correspondingly, and the pair of leg connecting assemblies are used for being connected with thighs and shanks on the same side of the user correspondingly; the viscous fluid damper comprises a first connecting piece and a second connecting piece which rotate relatively, and the first connecting piece is connected with the first rotating assembly; and the clutch device is arranged between the second connecting piece and the second rotating assembly, and the clutch device is used for switching the rotating coupling state of the second connecting piece and the second rotating assembly, so that the second connecting piece and the second rotating assembly are circumferentially coupled or decoupled. The buffering effect can be effectively improved, and joint impact is reduced.