115results about How to "Increase damping" patented technology

The invention relates to multi-dynamic-bond synergistic self-repairing polyurethane and a preparation method thereof, and belongs to the technical field of polyurethane. The polyurethane is prepared from the following raw materials: poly (dihydric alcohol), diisocyanate, a pyridine chain extender, catechol and ferric ion salt. A main chain of polyurethane is formed by chain extension of polydihydric alcohol and diisocyanate through a pyridine chain extender, an end group is a catechol group exposed after end sealing of a catechol substance, on one hand, ferric ions and the catechol group form a metal coordination bond, and on the other hand, ferric ions and nitrogen atoms on pyridine form a coordination bond; the polyurethane contains multiple dynamic bonds, including coordination bonds of pyridine and iron ions, coordination bonds of catechol and iron ions, and hydrogen bonds between macromolecular chains. When the material is subjected to external pressure, the material has relatively good damping capacity due to internal friction force in a molecular chain; meanwhile, the polyurethane has good self-repairing capability at room temperature.

The invention provides a virtual synchronous generator multi-machine parallel power distribution method, which belongs to the field of motors and power electronics, and comprises the following steps: 1, initializing necessary parameters, and monitoring the state of a power grid in real time; 2, predicting and controlling the dynamic response of the VSG by establishing a small signal model of VSG parallel operation; step 3, dynamically adjusting operation parameters of the VSG; and 4, executing a power distribution strategy by the system, distributing the calculated power to each VSG, and monitoring the process to ensure the uniformity of power distribution. According to the method, power distribution is carried out by preferentially utilizing photovoltaic output, the utilization rate of renewable energy sources is remarkably improved, meanwhile, optimal distribution of loads between the parallel virtual synchronous generators is achieved, the inertia and damping of the system are optimized, and the optimal distribution of the loads between the parallel virtual synchronous generators is achieved through a self-adaptive adjustment control strategy. And the advantage of parameter adjustability of the virtual synchronous generator is fully exerted, so that the control effect is further improved, and the stability of the power grid is enhanced.

The utility model provides a discharge nozzle turnover structure and feeder, including: bottom support plate, top support plate, top plate, hopper, discharge nozzle and shell, bottom support plate upper end is rotatingly connected with top support plate lower end, top plate is fixed in top support plate upper end, hopper is provided on top plate upper end face, shell is provided at top plate bottom, discharge nozzle is fixedly connected with shell bottom, and the top plate is fixed in top support plate upper end and top support plate lower end, the top plate is fixed in top support plate upper end, the hopper is provided with the discharge nozzle. And the hopper communicates with the interior of the discharging nozzle up and down. The hopper is fixedly installed on the top supporting plate through the top plate, the discharging nozzle and the shell are installed on the lower portion of the top supporting plate, the top supporting plate and the bottom supporting plate can be rotationally adjusted, and when the top supporting plate is turned backwards, the discharging nozzle and all components on the upper portion can be driven to be separated from the discharging track. Therefore, the discharging track and the discharging nozzle can be replaced and adjusted conveniently, and the complexity of replacement, disassembly and assembly is reduced. Due to the buffering effect of the butterfly-shaped elastic pieces, a good damping feeling exists in the rotating process, a gap exists between the bottom supporting plate and the top supporting plate, and rotating adjustment is smoother.

The invention belongs to the technical field of oil conservator liquid level monitoring, and discloses a transformer oil conservator oil level digital online monitoring device which comprises an oil conservator and a control circuit, the top and the bottom of the oil conservator are fixedly communicated with a first pipeline and a second pipeline respectively, a dehumidifier is arranged at the top of the first pipeline, and the transformer oil conservator oil level digital online monitoring device further comprises a monitoring assembly arranged in the oil conservator; and the damping assembly is mounted on the monitoring assembly. According to the scheme, the floating block changes along with the change of the oil level in the oil conservator, and at the moment, the floating block drives the rotating shaft to rotate through the connecting rod, so that the contact position of the sliding sheet and the concave surface of the arc-shaped resistor changes; at the moment, the current passing through the arc-shaped resistor at the position of the sliding piece changes along with the change of the contact position of the sliding piece and the concave surface of the arc-shaped resistor, then the control circuit converts a current signal into the height of the liquid level in the oil conservator and transmits data to a monitoring terminal, and therefore the safety and accuracy of the device for monitoring the oil level of the oil conservator are improved.

The invention provides a tower wind load model test device and test method, the device comprises a tower simulation piece and a damping adjustment unit, the damping adjustment unit comprises an eddy current conductor assembly and an electromagnetic assembly, the eddy current conductor assembly comprises an eddy current conductor and a magnetic back plate, and an air gap is reserved between the electromagnetic assembly and the eddy current conductor. The method comprises the following steps: constructing a tower simulation piece according to a scale ratio, and determining the thickness of a longitudinal main tower rod of the tower simulation piece according to the thickness and the elastic modulus of the longitudinal main tower rod of the tower and the elastic modulus of the tower simulation piece; the critical vortex vibration initial wind speed, smaller than the preset safe wind speed, of the tower is screened out from the vortex vibration initial wind speeds of the tower during vibration of all orders; determining the optimal test simulation wind speed of the tower simulation part according to the critical vortex vibration initial wind speed and the wind speed ratio; and the electromagnetic assembly adjusts the initial damping force of the damping adjusting unit to the target damping force. The method has the advantages of improving accuracy and reliability of test results, reducing potential safety hazards of the tower and the like.

The invention discloses a hindered phenol AO-1010 / nitrile rubber composite damping material and a preparation method thereof. The hindered phenol AO-1010 / nitrile rubber composite damping material comprises a nitrile rubber matrix, zinc oxide, stearic acid, sulfur, carbon black, an anti-aging agent 4020, an accelerant DM, an accelerant TMTD and hindered phenol AO-1010. According to the invention, hindered phenol AO-1010 is adopted to form hydrogen-bond interaction on a nitrile rubber matrix to improve the damping performance of nitrile rubber, and fracture and recovery of hydrogen bonds can greatly improve the friction resistance of molecular chain activity of nitrile rubber, so that the movement of molecular chains is hindered, the friction heating effect between molecules is improved, and the damping performance is better; a proper amount of carbon black is added into the rubber blend, and the carbon black is used as a rubber reinforcing agent, so that the mechanical property of the rubber can be greatly improved, the carbon black has a relatively strong adsorption effect on molten hindered phenol AO-1010, and the compatibility between the hindered phenol AO-1010 and a rubber matrix is indirectly improved; therefore, the rubber can still keep good mechanical properties while having good damping performance.

The invention provides a self-rebounding heat-preservation and heat-insulation protective coating with ultralow thermal conductivity and a protective coating. The self-rebounding heat-preservation and heat-insulation protective coating with ultralow thermal conductivity comprises a coating body and a coating layer, comprising silicon resin emulsion, acrylic resin emulsion, modified polymer expanded microspheres, modified mineral fibers, polyvinyl alcohol toughened and modified hydrophobic silicon dioxide aerogel, a cross-linking agent, a catalyst, a thickening agent, a dispersing agent, a defoaming agent, a coalescing agent, a pH regulator, ethylene glycol and deionized water. The modified polymer expanded microspheres are polymer expanded microspheres subjected to surface modification treatment by a silane coupling agent I, and the modified mineral fibers are mineral fibers subjected to surface modification treatment by a silane coupling agent II. The lowest heat conductivity coefficient of a protective coating obtained by curing the ultralow-heat-conductivity self-rebounding heat preservation and insulation protective coating can reach 0.0180 W / (m.k) at the temperature of 25 DEG C, and the heat insulation temperature difference obtained after irradiation of a non-contact infrared heating lamp at the temperature of 80 DEG C for 15 min and the heat insulation temperature difference obtained after heating of a contact heating platform at the temperature of 80 DEG C for 15 min are larger than 35 DEG C and 40 DEG C respectively.

The utility model provides an MEMS piezoelectric sounder and a loudspeaker, first piezoelectric composite layers are symmetrically arranged at specified edge positions, a plurality of slotted structures are arranged in a specified area, a first diaphragm edge of a formed diaphragm structure is an anchoring edge, and an edge slotted structure is arranged at a non-anchoring edge. The internal stress of each diaphragm layer in the diaphragm structure caused by the process can be reduced by arranging the slotting structure, the flexibility of the diaphragm structure can be improved by covering the slotting structure with the flexible material, meanwhile, the sound leakage of the MEMS piezoelectric sounder at low frequency is reduced, the vibration amplitude and the emission sound pressure level of the MEMS piezoelectric sounder are improved, and the sound quality of the MEMS piezoelectric sounder is improved. According to the MEMS piezoelectric sounder, the flexible material with low density is adopted to replace a silicon vibrating diaphragm with large density, the mass of the vibrating diaphragm structure is reduced, the vibrating diaphragm structure of the rectangular bridge type structure can push out more air, the flexible material increases system damping, a sound pressure level SPL frequency response curve and a THD frequency response curve can be improved, and therefore the tone quality of the MEMS piezoelectric sounder is improved.

The invention discloses a construction method of a vibration reduction and isolation system for relieving the influence of industrial vibration on surrounding buildings. The construction method comprises the following steps that firstly, an industrial vibration source and the surrounding buildings are determined; 2, designing a vibration isolation trench; 3, excavating a vibration isolation trench; 4, loose soil bodies are removed, and soil residues are cleaned; 5, heating the modified asphalt, and heating and stirring the modified asphalt and the added hemp knife; sixthly, the improved asphalt hemp mixture is poured into the vibration isolation trench to be filled layer by layer; 7, naturally cooling and curing the mixture; and 8, sealing the vibration isolation trench by adopting a rubber cover plate. The vibration isolation ditch for pouring the improved asphalt hemp mixture is arranged between the industrial vibration source and the building, the propagation path of vibration waves generated by the industrial vibration source is changed, the energy of the vibration waves is consumed, the vibration reduction and isolation energy consumption efficiency of the vibration reduction and isolation system is greatly improved, vibration disasters of industrial vibration to surrounding houses are effectively relieved, and the service life of the vibration reduction and isolation system is prolonged. And meanwhile, industrial production is not affected, and the method has creative engineering significance and has the practical value of simple construction process and low cost.

The invention discloses an immersive cinema dynamic content adaptation control method based on multi-modal fusion, and the method comprises the steps: collecting at least one non-contact physiological signal of a target audience seat area in real time, the physiological signal comprising a respiratory wave signal collected by a millimeter wave radar or a photoplethysmography signal collected by a near-infrared photoelectric sensor; performing time-frequency analysis on the physiological signal, and extracting a physiological wake-up characterization value in a current time window; the physiological wake-up characterization value comprises a heart rate variability change rate and a heart rate deviation value; constructing a dynamic damping adjustment model, and calculating a virtual damping coefficient of the seat movement system at the current moment based on the physiological wake-up characterization value; and the virtual damping coefficient is converted into an execution instruction of a seat motion controller, and damping force output of the motion platform is adjusted in real time. The technical problem that the pre-programmed motion feedback is disjointed with the real-time physiological and psychological state of the audience can be solved, the experience adaptability and comfort of the cinema seat are improved, and the system safety is improved.

The invention relates to an ejector pin strength detection device and method for automobile lamp injection mold production, and the ejector pin strength detection device comprises an ejector pin body, and further comprises a detection box, and a support plate and a first sliding seat which are fixed in the detection box, and the first sliding seat is slidably mounted on the support plate; a positioning assembly used for clamping an ejector pin body and a base are installed on the supporting plate, the base is fixed to the supporting plate, a sliding piece is installed on the base in a sliding mode in the length direction, an inclined piece is fixed to the end of the sliding piece, the sliding piece is connected with an adjustable resistance assembly installed on the detection box, and the adjustable resistance assembly is connected with the ejector pin body. When the reciprocating assembly drives the first sliding seat to reciprocate, the stepping assembly drives the adjustable resistance assembly to work, damping provided by the adjustable resistance assembly to the sliding piece is gradually increased, and simply, when the ejector pin body reciprocates every time, force provided by the inclined piece to the ejector pin body during testing is increased.

The invention discloses a multifunctional intelligent electric meter verification device, and relates to the technical field of intelligent electric meter verification, the multifunctional intelligent electric meter verification device comprises a protection box, the front surface of the protection box is provided with a box door, the front surface of the box door is provided with a handle, the upper surface of the protection box is provided with a lifting handle, the protection box is internally provided with an electric meter verification instrument, and the exterior of the electric meter verification instrument is provided with a clamping assembly. Through cooperative arrangement of the protection box, the box door, the handle, the lifting handle, the electric meter calibrator, the clamping assembly, the calibration wire, the silica gel sleeve, the calibration connector and the damping assembly, the calibration connector is pulled downwards to pull out the calibration wire, and the calibration connector is used for being connected with a calibrated intelligent electric meter. According to the electric meter checking device, the electric meter checking instrument can be conveniently used for checking the intelligent electric meter, the electric meter checking instrument can be conveniently mounted and dismounted through the arranged clamping assembly, when the electric meter checking instrument is damaged, the electric meter checking instrument can be conveniently maintained and replaced, and the use effect of the electric meter checking device can be guaranteed.

The invention belongs to the technical field of formworks, discloses a high-strength alloy formwork assembly and a construction method thereof, and solves the problems that an existing angle-adjustable formwork can form arc-shaped surfaces at external corners and internal corners, and slurry and fine particles can enter a rotating structure during pouring, so that the service life is greatly shortened. The corner formwork comprises two corner formworks and a rotating structure, sealing strips are installed in installation grooves of the corner formworks, the sealing strips on the two corner formworks extend out of the installation grooves and are in contact sealing with each other, and the side faces, extending out of the installation grooves, of the sealing strips and the working faces of the corner formworks are located on the same plane. And the rotating structure is arranged on the side surface opposite to the working surface of the corner template. Planes can be formed at the external corner and the internal corner, slurry or concrete and the like cannot enter the rotating structure during pouring, and the problem that the rotating structure is damaged due to foreign matter is solved.

This invention provides a rotating shaft assembly, comprising a base, a first rotating mechanism, a second rotating mechanism, and a damping mechanism. The first rotating mechanism is rotatably connected to one side of the base; the second rotating mechanism is rotatably connected to the opposite side of the base. The damping mechanism includes a stop member slidably connected to the base and a first elastic member. The first rotating mechanism and the stop member are rotatably connected via a first arcuate rail and a first arcuate groove. The second rotating mechanism and the stop member are rotatably connected via a second arcuate rail and a second arcuate groove. The axis of the first arcuate groove is parallel to the axis of the second arcuate groove. The first elastic member has a pre-elastic force that causes the stop member to abut against the first rotating mechanism and / or the second rotating mechanism. This invention also provides a folding housing and an electronic device.

The present invention relates to the field of rubber damping materials, and discloses a polymer and a preparation method thereof, as well as a brominated branched butyl rubber and a preparation method and application thereof. The polymer contains a structural unit A, optionally a structural unit B, a structural unit C and a structural unit D; wherein the structural unit A has a structure shown in formula (1); the structural unit C has a structure shown in formula (2); the structural unit B is connected to the structural unit A and the structural unit C respectively; the structural unit D is a terminal capping structural unit; the structural unit B and the structural unit D are independently derived from a conjugated diene. The method of the present invention solves the problems of low damping and halogenated structural isomerization rearrangement in butyl rubber, not only avoiding the damage of the damping brominated grafting agent to the mechanical properties and air permeability of butyl rubber, but also improving the damping performance and tensile strength of butyl rubber.

The present invention provides a metal rubber blank and a preparation method thereof and a metal rubber molded part, and relates to the field of metal rubber technology. The preparation method limits some detailed parameters (such as the winding height of the spiral winding on the mandrel, etc.) during the preparation of the metal rubber blank and sets the winding nodes, so that the hooking / meshing between the metal wires inside the prepared metal rubber blank is consistent, the tightness between the blank and the mandrel is consistent, and the same tension is maintained, which provides a good foundation for the subsequent preparation of the metal rubber molded part. The present invention also provides a metal rubber molded part, which is made using the above-mentioned metal rubber blank. In view of the advantages of the above-mentioned metal rubber blank, the metal rubber molded part made therefrom has good stiffness and damping performance.

The utility model relates to a transverse impedance multidirectional damping steel spring device which comprises a spring outer sleeve (1), a steel spring (5) and a spring inner sleeve, the spring inner sleeve comprises a spring inner sleeve cover (2) and a spring inner sleeve base (6), and a transverse impedance elastic body (3) for transverse limiting is arranged between the spring outer sleeve (1) and the spring inner sleeve base (6). Compared with the prior art, three-direction damping amplification is adopted, besides the main vibration isolation direction, the stability and vibration in the direction perpendicular to the main vibration isolation direction of the spring can be controlled, and meanwhile the problem that the spring is subjected to transverse shearing dynamic load to cause fatigue fracture and failure of the spring is solved; therefore, the transverse stability and reliability are improved, and the service life of parts is prolonged.

The present invention discloses a conveying device for producing plastic handicrafts, and relates to the technical field of conveying equipment for plastic handicrafts, comprising a vehicle body and a conveying box, wherein a rotating shaft is rotatably passed through the bottom of the vehicle body, and wheels are fixedly installed on the surface of the rotating shaft, and also comprises a shock absorbing device, wherein the conveying box is placed inside a base, the hollow sleeve is fixedly installed on the bottom of the base, the mounting block is fixedly installed on the surface of the hollow sleeve, the flip plate is rotatably installed on the surface of the mounting block, the connecting plate is rotatably passed through the bottom of the hollow sleeve, the Z-shaped piece is fixedly installed on the top of the chassis, and the abutment plate is fixedly installed on one end of the Z-shaped piece close to the connecting plate. By arranging the elastic Z-shaped piece, the downward moving distance of the telescopic end of the buffer damper is effectively controlled, thereby improving the buffering effect of the buffer damper.

The invention discloses a preparation method of a wide-temperature-range high-damping metal hollow sphere / polyurethane damping composite material, and relates to a preparation method of a damping composite material. The method comprises the following steps: 1, carrying out surface modification on metal hollow spheres; and 2, preparing the polymer. Compared with pure polyurethane, the prepared wide-temperature-range high-damping metal hollow sphere / polyurethane damping composite material has the advantages that the damping performance is greatly improved, the temperature range is widened, the excellent damping performance and acoustic performance are achieved, the preparation process is simple, the stability is high, and the composite material is suitable for large-area pouring and complex-shape base materials; wide application prospects are realized in the fields of ships, aerospace, vehicles, building materials and the like; after the surface-modified metal hollow spheres are compounded with polyurethane, the damping performance can be greatly improved, the temperature range is widened, the loss factor is increased from 0.45 to 0.85, and the effective temperature range is widened from 59.9 DEG C to 100 DEG C or above.

The utility model discloses an alternating-current low-voltage wire inlet cabinet and a door plate structure thereof, relates to the technical field of power distribution cabinet door plates, aims to solve the problem that the service life of a power distribution cabinet is shortened due to the fact that a door plate lacks an anti-collision function, and adopts the technical scheme that the alternating-current low-voltage wire inlet cabinet comprises a cabinet body and a door plate, the door plate is hinged to the cabinet body, and an anti-collision box is arranged on the top surface of the cabinet body; an anti-collision mechanism is arranged in the anti-collision box, the anti-collision mechanism is connected with the door plate through a connecting column, and the connecting column is a polygonal column; a multilateral hole is formed in a door plate, the multilateral hole penetrates into an anti-collision box through a connecting column to be connected with a steering piece, when the door plate is rotated, the steering piece is driven to rotate by an angle, the steering piece drives a limiting piece to move in a sliding way, an auxiliary plate is matched, the limiting piece is clamped by the auxiliary plate in the sliding process, and therefore the door plate is prevented from falling off in the overturning process. The resistance is gradually increased, so that when the door plate is closed, the purpose of anti-collision protection is achieved, and the situation that strain is aggravated due to long-term collision is avoided.

The utility model discloses a cable stripping device, comprising a frame, a frame, arc plates and a cutter, the frame is fixedly connected with the frame, the inner side of the frame is symmetrically provided with a plurality of arc plates, the arc plates are attached to a cable, and the cutter is slidably connected to the arc plates; the traction assembly is used for tensioning the cable; according to the utility model, cable conductors can be effectively prevented from being damaged.

The utility model provides a hinge and a refrigerator comprising the same. The hinge comprises a first hinge base, a second hinge base, a transmission assembly and an electromagnetic damper, the first hinge base is used for being installed on the box body, the second hinge base is used for being installed on the door body, the transmission assembly is connected between the first hinge base and the second hinge base in a hinged mode, and the transmission assembly comprises a first transmission rod, a second transmission rod, a third transmission rod and a fourth transmission rod; an electromagnetic damper is arranged on at least one of hinge points of the hinge; and the power supply is electrically connected with the electromagnetic damper, and the magnitude of current introduced into the electromagnetic damper can be adjusted. According to the hinge, the damping performance can be kept in a better state, and the current introduced into the electromagnetic damper can be adjusted, so that the damping performance of the electromagnetic damper can be adjusted, the use flexibility is better, and the hinge can better adapt to the intelligent requirement.

The application discloses a kind of high protein yoghourt production energy-saving cooling device, belong to yoghourt production equipment technical field.Device includes conveying pipe, cooling cavity, vibration cavity, cooling cavity is sleeved in the outside of conveying pipe, and the outer wall of conveying pipe is equipped with circumferential array spiral groove, spiral vibration cavity is embedded in groove, and cavity body two ends are respectively communicated with air inlet pipe and air outlet pipe.Cooling cavity is equipped with coiled cooling pipe inside, and cooling pipe is positioned by fixed ring, and it is constituted stable damping structure by collocating support plate and shock absorber, and fixed ring is equipped with rubber ring with array through hole between conveying pipe, can improve damping effect.Vibration cavity inside is connected in series with multiple groups of vibration body with eccentric flywheel, can generate high-frequency micro-vibration, continuously disturb viscous yoghourt, avoid material adhesion and block pipe.The present application relies on spiral flow guide and vibration disturbance structure, solve the problem that high protein yoghourt is not uniformly cooled, is easy to accumulate and coagulate, effectively improve the efficiency of heat exchange, reduce production energy consumption, equipment runs stably, adapts continuous production, effectively guarantee yoghourt quality.

A mobile device stylus includes a coupling portion couplable to a face of a mobile device, a support portion connected to a portion of the coupling portion, and a contact portion to contact a screen of the mobile device to operate the mobile device, an end of the contact portion connected to the coupling portion, wherein the coupling portion is a ring structure, a non-circular ring structure, or a non-enclosed ring structure.

The utility model relates to the technical field of auxiliary walking instruments, in particular to an exoskeleton brace which comprises a thigh fixing rod, a shank fixing rod and a sole fixing rod are sequentially arranged below the thigh fixing rod in the direction away from the thigh fixing rod, and a knee joint locking component is arranged between the thigh fixing rod and the shank fixing rod. An ankle joint connecting component is arranged between the shank fixing rod and the sole fixing rod. The utility model provides an exoskeleton brace which can restrain the rotation of the knee joint of a patient by imitating the rotation postures of the knee joint and the ankle joint of a human body, reduces the falling of the patient, is convenient for maintaining the correct walking posture of the patient, and is used for overcoming the defects in the prior art.

The invention provides a seat damping control method and system, a vehicle-mounted terminal and a storage medium, and the method comprises the steps that bumpy road section information is obtained, the bumpy road section information comprises the bumpy grade of a bumpy road section, and the bumpy grade is determined according to the type of the bumpy road section and the current vehicle speed; according to the jolting levels and a preset mapping relation, the target excitation current of the magnetorheological damper is determined, and the mapping relation is the corresponding relation between different jolting levels and different excitation currents; the current excitation current of the magnetorheological damper is adjusted to the target excitation current; and the target excitation current is corrected according to the real-time vehicle speed and the real-time speed information of the seat, and seat damping is achieved. The current of the magneto-rheological shock absorber is adjusted in advance based on the front road condition information, and then the current of the magneto-rheological shock absorber is corrected and controlled based on the real-time vehicle speed and the real-time speed information of the seat, so that the seat shock absorption control is more stable and accurate, and the seat shock absorption effect is remarkably improved.

The application discloses a wind power blade liquid damper, a prefabrication method and a wind power blade. The liquid damper comprises an elongated pipe and damping liquid. The elongated pipe is arranged in parallel on the SS inner surface and the PS inner surface of the wind power blade at a preset interval, is located at the wind power blade tip, is arranged along the airfoil contour line of the wind power blade, and is connected to the leading edge and the trailing edge of the wind power blade at two ends. The central axis of each elongated pipe is perpendicular to the pitch shaft of the wind power blade. The damping liquid is filled in the elongated pipe at a preset volume filling rate, so that the damping liquid is constrained in the elongated pipe and flows back and forth along the airfoil contour line of the wind power blade. The centrifugal force direction of the blade is always perpendicular to the movement track of the damping liquid. The liquid turbulent flow is generated by bending the elongated pipe to absorb vibration energy, the first-order pendulum vibration of the wind power blade can be effectively inhibited, and the liquid damper can meet the maintenance-free characteristic requirement in the service life.

The application discloses a design method of a virtual additional stability controller of a phase-locked synchronization type grid-connected VSC and belongs to the technical field of phase-locked synchronization, comprising the following steps: designing a stability controller composed of a direct-current isolation link, a lead-lag and a proportional coefficient, defining an angle of operation as an included angle of an output current and an equivalent current of a power grid, taking the angle of operation as an input of the stability controller and taking an additional q-axis voltage of a grid-connected point as an output, establishing a Heffron-Philips model based on the defined angle of operation to obtain a feedback branch transfer function from the angle of operation to power, calculating a lag angle caused by the feedback branch transfer function from the angle of operation to power according to a sub-synchronous oscillation frequency of the phase-locked synchronization type grid-connected VSC, realizing compensation of negative damping caused by the lag angle of the negative feedback branch, thereby improving damping of the phase-locked synchronization type grid-connected VSC and enhancing synchronization stability of the phase-locked synchronization type grid-connected VSC, and thus solving the technical problem that the existing phase-locked synchronization type grid-connected VSC has low synchronization stability and is prone to sub-synchronous oscillation.

The present invention discloses a new energy electric car sound insulation material and its production process, and relates to the technical field of sound insulation materials. The production process of the sound insulation material of the present invention comprises the following steps: after adding butyl rubber to a rubber mixer and rolling it, adding stearic acid and zinc oxide for mixing, adding cross-linked silicone rubber for mixing evenly, adding diisopropyl peroxide, thinning out a sheet, vulcanizing and molding, and obtaining modified silicone rubber; after mixing the modified silicone rubber and benzoyl peroxide, a mixed component is obtained; plasticizing acrylonitrile-butadiene-styrene copolymer and rolling it, adding the mixed component for mixing, and obtaining a masterbatch; mixing the masterbatch and acrylonitrile-butadiene-styrene copolymer evenly, melt-extruding, granulating, and drying, and obtaining a sound insulation material. The present application adds modified silicone rubber to the sound insulation material, giving the sound insulation material excellent barrier effects in both medium and high frequency noise and low frequency noise.

The invention discloses a damping modifier, a noise-reducing damping ABS material and a preparation method of the damping modifier. The noise-reducing damping ABS material comprises the following components in parts by weight: 80-95 parts of ABS; 5-20 parts by weight of a damping modifier; and 0-3 parts by weight of a processing aid. The material provided by the invention has excellent mechanical properties, high damping coefficient and excellent silencing effect.