181results about How to "Increase the damping factor" patented technology

The invention relates to a large axial eddy current damper manufactured through a spiral transmission method. The axial eddy current damper based on the spiral transmission method comprises a spiral pair transmission assembly and a rotary eddy current damping generator. The rotary eddy current damping generator comprises an upper disc and a lower disc which are consistent in size, are vertically parallel and are made of magneto-conductive materials, wherein a rotary disc which is parallel with the upper disc and is made of electricity-conductive materials or magneto-conductive materials is arranged between the upper disc and the lower disc, the rotary disc is installed on the spiral pair transmission assembly and rotates along with the spiral pair transmission assembly, a plurality of pairs of magnets are further arranged between the upper disc and the lower disc, and the opposite magnetic poles of an upper magnet and a lower magnet of each pair of magnets are opposite in polarity. According to the axial eddy current damper based on the spiral transmission method, axial movement of a controlled structure is converted into the rotary movement of an inner structure of the damper to be controlled through a spiral pair, the control efficiency is largely improved, and the ratio between the damping force of the axial eddy current damper and the self weight is improved to the level equal to that of a viscous fluid damper or higher level.

The invention belongs to the technical field of rubber and discloses an ultra-high damping rubber composite material and a preparation process of the rubber composite material. The preparation process disclosed by the invention is mainly technically characterized by comprising the following steps of: adding short fibers, carbon black, petroleum resin, a plasticizer, a vulcanizing agent, an active agent, an accelerant and an anti-aging agent in rubber; and mixing the components in an internal mixer and then vulcanizing in a flat vulcanizing machine. According to the ultra-high damping rubber composite material disclosed by the invention, a predetermined amount of short fibers, carbon black and petroleum resin are uniformly dispersed in a rubber matrix; compared with the common high-damping material, the damping coefficient of the ultra-high damping rubber composite material disclosed by the invention is increased by more than 20%; and the ultra-high damping rubber composite material disclosed by the invention has the advantages of being strong in energy consumption property and ductility and obvious in damping and shock insulating effects, effectively controlling the earthquake response of shock insulating structures, and being environment-friendly and stable in property. The stretching strength is greater under the condition with the same hardness, so that a rubber bearing prepared by the ultra-high damping rubber composite material disclosed by the invention is greater in bearing force; the whole size of the bearing is smaller than the size of the traditional high-damping rubber bearing; and the rubber bearing has the advantages of saving the use space, being convenient to construct and more excellent in resistance to fatigue performance.

The invention discloses an automatic navigation path tracking method for an aquaculture workboat. The method comprises the following steps: 1, collecting the position information of corners reflecting the contour of a work region, and obtaining the target navigation lien and speed of the workboat through track planning; 2, collecting the real-time position, navigation and speed of the workboat, setting the navigation speed of the workboat, and judging whether a target path needs to be switched or not; 3, calculating a tracking target point of the workboat through employing a method of real-time point insertion; 4, enabling the attitude and movement state data of the workboat to be compared with a tracking target point and a target path, obtaining the navigation direction and speed deviation, obtaining the navigation direction and speed control amount through employing the PD and PI algorithms, and finally obtaining the control amounts of left and right paddle wheels; 5, carrying out the real-time navigation control of the workboat according to the final control amounts. The method can remarkably improve the effect of automatic navigation path tracking, and provides guarantee for the high-efficiency completion of aquatic plant cleaning and uniform bait casting.

The invention relates to a capacitor-less low dropout regulator, which comprises a first-stage amplifier, a second-stage buffer, a voltage division circuit and an output transistor, wherein an impedance device is introduced between an output end of a common drain amplification circuit of the second-stage buffer and the ground, the impedance device is an active resistor device or a passive resistor device which is used for increasing the output resistance of the second-stage buffer, effectively controlling the damping coefficient of the capacitor-less low dropout regulator and reducing the influence of complex poles on dominant poles. Frequency compensation of the capacitor-less low dropout regulator is realized, and under the condition that a capacitor device does not need to be increasedadditionally, low-dropout output voltage is ensured to be precise and stable and have low noise, and the capacitor-less low dropout regulator can be used in a circuit capable of realizing monolithic integration and driving larger capacitive load.

The invention provides a silicon-based IGBT and silicon carbide Schottky diode hybrid grid driving system. The grid driving system comprises a driving input stage, a logic enabling circuit, a current source circuit, an IGBT grid voltage-to-time change rate detection circuit, an IGBT collector current-to-time second-order differential change rate detection circuit, an IGBT, a Schottky diode D1 and a sampling resistor Rx. All stages of the IGBT starting process are mastered in real time by sampling and detecting the grid voltage VG of the IGBT, the change rate dVG/dt of the grid voltage and the second-order change rate d(dIc/dt)/dt of the collector current, after judgment of the logic enabling circuit and control over the current source circuit in the grid driving circuit, the size of the driving current in the IGBT starting process can be changed, and then the purposes of inhibiting current oscillation to reduce current overshoot and starting loss in the IGBT starting process are achieved.

The invention relates to a material used for buildings and a production method of the material. The hybrid nanocomposite material used for buildings provided in the invention includes the following components by weight: 100 parts of cement, 10-30 parts of water-based resin, 0.01-45 parts of a water-based resin curing agent, 25-50 parts of water, 0.5-2 parts of a super plasticizer, 0.1-5 parts of a nano-fiber, 0.1-5 parts of a nano-fiber dispersing agent, 0.01-3 parts of a thickening stabilizer, and 0.02-0.2 part of a foam inhibitor. With the method provided in the invention, the nano-fiber can realize good dispersion and network distribution in a water-based resin system and a subsequent resin/cement hybrid matrix, and can form a compact reticular cemented structure together with hardening resin and cement, thus improving the dynamic shock resistance and dynamic vibration damping performance of the hybrid composite material.

The invention relates to a large-sized axial eddy current damper manufactured by using screw drive. The damper comprises a drive component and an eddy current damping generator, wherein the drive component comprises a screw drive pair, a stator and a rotor; the stator and the rotor are made of a magnetic conductive material; the screw drive pair comprises a screw and a nut which is arranged on the screw in a sleeving manner; the screw penetrates through an upper flange central hole of the stator and a lower flange central hole of the stator in sequence, and the nut is arranged in the stator; the rotor comprises an outer rotor and an inner rotor of which the bottom is provided with a lower connecting flange; one or more eddy current damping generators are arranged between the stator and the rotor. According to the damper, the damping coefficient and the inertial mass moment of the rotary eddy current damping part can be enlarged by hundreds of thousands of times to be converted into extremely large axial damping coefficient and axial equivalent added mass; meanwhile the problem that the axial damper with a large damping coefficient and the anti-seismic damper with a simulation speed index of being less than 1 are difficult to manufacture by using the rotary eddy current damping is solved.

The invention belongs to the technical field of human-computer interaction, and particularly discloses a robot variable admittance control method and system based on operator comfort. The method comprises the following steps: 1, pre-processing a human hand operating force to obtain an environmental interaction force; 2, generating a virtual damping adjustment strategy according to an operator comfort force and a robot end actual pose; and 3, constructing a robot six-degree-of-freedom admittance control model according to the virtual damping adjustment strategy to obtain a deviation force between the environmental interaction force and an expected force, and generating correction amounts of the position, speed and acceleration of the robot end according to the deviation force so as to correct the robot end actual pose. The system comprises a man-machine interaction module, a human hand operating force pre-processing module, a variable admittance control module and a robot end position control module. According to the method and the system, the damping coefficient in the admittance control is adjusted in real time according to the operator comfort force and the robot tail end speed,the calculation is simple, the real-time performance is high, and the operation feeling and the immersion feeling of man-machine interaction are improved.

The invention belongs to the field of low dropout linear regulators, and provides a low dropout linear regulator and a frequency compensating circuit thereof. The low dropout linear regulator comprises an error amplifier with a folded cascode structure or a sleeve structure, wherein the frequency compensating circuit, based on a current buffer stage circuit and a cascode Miller's compensating circuit, further comprises a transconductance boosting circuit. The frequency compensating circuit takes advantage of the positive correlation property of a damping coefficient and common gate transistor transconductance, boosts the equivalent transconductance of a common gate transistor in the error amplifier via the feedback of the transconductance boosting circuit, increases the damping coefficient further, eliminates the complex poles that are possible to appear in the system, and then enhances the stability of the system.

The invention relates to shoe soles and provides an antiskid rubber outsole which is specially used on surfaces containing surfactants and oil stains and a manufacturing process of the outsole. The antiskid rubber outsole is prepared from nitrile butadiene rubber, integrated rubber, solution polymerized styrene-butadiene rubber, modified liquid polybutadiene rubber, fumed silica, a plasticizer, an anti-aging agent, petroleum resin, a white smoke activator, a silane coupling agent, polyethylene wax, zinc oxide, sulfur, and a vulcanization accelerator. The antiskid rubber outsole has excellent antiskid effect not only on a regular dry or wet surface or a surface containing surfactants, for example, detergents, and an oil stain surface. People can walk safely and stably on the outsoles. The manufacturing process has simple processes and is easy to carry out, and is suitable for large-scale production.

The invention provides a low-frequency, broad-band and local-area resonance structure with super damping characteristics. The structure comprises a rhombic frame; a first end of the rhombic frame is connected with a basal body beam through a rubber block; rubber bars are arranged on short diagonal lines in the rhombic frame; and one ends of the rubber bars are connected with the first end of the rhombic frame, and the other ends are connected with a second end of the rhombic frame. Mass blocks are arranged at two ends of the rhombic frame, and the structure is periodically added on a beam unit, so that the low-frequency band gap is widened, and the vibration attenuation is enhanced. The structure is better in geometric nonlinearity, can generate additional damping and mass, and effectivelyimproves low-frequency vibration characteristics of a system.

A waterborne damping coating for vehicles of the invention belongs to the fields of chemical product and coating preparation. The waterborne damping coating comprises an emulsion base material, an inorganic matter filler, a film forming additive, a thickening agent, a heating-expansible organic hollow filling material, an organic foaming agent, and water. The emulsion base material is compounded by 2-3 emulsions with different Tgs; the using amounts of the heating-expansible organic hollow filling material and the organic foaming agent respectively account for, on a weight basis, 0.3%-5% and 0.1%-5% of the total amount of the waterborne damping coating. The thick paste coating prepared in the invention has a damping value of 0.06-0.15 at 20-60 DEG C; the coating has a micropore structure,can prevent film defects such as chaps, cracks, needle eyes, expansion and the like caused by the coating, can form a film with a thickness of 3-6 mm by coating once, and is applicable to the coatingof vibration parts of various vehicles and motor products so as to inhibit vibration and reduce noise.

The invention relates to a process for manufacturing a magnesium alloy wheel and a process for manufacturing a wheel rim of the magnesium alloy wheel, which comprises: a step of hot extrusion, namely making a sectional material into a more than half ellipse shaped wheel rim semi-finished product in a longitudinal forming device through hot bending; a step of fully rounding, namely rolling the elliptic wheel rim semi-finished product into a full round shape by a rolling circle device, performing further pressurization and rounding on the full-circle wheel rim semi-finished product by a pressure device after performing a preparation process of welding, and finally performing the welding; and a step of air hole processing, namely processing air holes for setting inflating valves. The process for manufacturing the magnesium alloy wheel is further characterized by comprising: a step of plate blanking, namely manufacturing a circular plate and forming a center hole on the circular plate through hot stamping; a step of hot stretch forming, namely performing hot stretch on the circular plate for scheduled times; a step of hot stamping, namely forming a connecting structure and a heat sinking structure on the wheel rim semi-finished product through the hot stamping; and a step of performing a process of gang welding, namely assembling the wheel rim and a wheel spoke into a wheel.

The invention belongs to the technical field of organic high-molecular compounds, and particularly relates to a light-weight shock-absorption rubber plastic foamed material and a preparation method thereof. The preparation method comprises the following steps: carrying out banburying, open mixing and granulation on EVA (ethylene-vinyl acetate), butyl rubber, ethylene-octylene copolymer, a solubilizer, a foaming agent, a crosslinking agent, nano zinc oxide, zinc stearate, stearic acid, an aging accelerator and an inorganic filler to obtain rubber plastic granules, and carrying out one-step injection molding to obtain the light-weight shock-absorption rubber plastic foamed material. The light-weight shock-absorption rubber plastic foamed material has the characteristics of light weight, high shock absorptivity, favorable yellowing resistance, high dimensional stability, excellent tensile strength, excellent tear strength and the like, can be used in automobile vibration absorbers, various shock absorption pieces, shoe sole materials and the like, is especially suitable to be used as a midsole for jogging shoes, can absorb counterforce from the ground, and can well protect the feet from hurt.

A method for increasing the stability of a high-temperature superconductor magnetic suspension system comprises the following: (A) a step of field cooling, during which, a suspension body of the high-temperature superconductor magnetic suspension system is supported at a preset position through a support system, and then refrigeration equipment is started to ensure that a superconducting block enters superconducting state; (B) a step of support release, during which, the support system releases the support on the suspension body so as to ensure that the suspension body is in an idling stable state; (C) a step of loading, during which, external force is applied on the suspension body so as to ensure that the suspension body is in a stable suspension state under external force loading; and (D) a step of loading and the external force release, during which, the suspension body is in the stable suspension state again, and the state is taken as an initial state for the operation of the high-temperature superconductor magnetic suspension system. The method does not need to change the construction of the high-temperature superconductor magnetic suspension system, and ensures simple structure and operation and cost reduction; moreover, the method can obviously improve the stability of the high-temperature superconductor magnetic suspension system, and is suitable for any high-temperature superconductor magnetic suspension systems based on the high-temperature superconducting block type magnetic suspension principle.

The invention relates to the technical field of vibration reduction of elevator guide rails, in particular to a guide rail module with the vibration damping function. The guide rail module with the vibration damping function comprises a T-shaped guide rail, wherein a vibration absorption damping bar in the length direction of the guide rail is installed on the back side of the guide rail, a notch is formed in the middle of the vibration absorption damping bar, a power vibration absorption mechanism which is arranged according to the first-order natural frequency of the guide rail is further installed on the back side of the guide rail, the power vibration absorption mechanism mainly comprises an L-shaped support, a vibration absorption spring and a vibration absorption mass block, the L-shaped support is embedded in the notch and fixed to the back side of the guide rail, the vibration absorption mass block is placed on the transverse beam of the L-shaped support, one end of the vibration absorption spring is connected with the vertical beam of the L-shaped support, and the other end of the vibration absorption spring is connected with the vibration absorption mass block. With the guide rail module with the vibration damping function, the maximum amplitude can be reduced, and also, the effect of reducing vibration is achieved.

The invention discloses a shafting oscillation suppression control system for a double-fed wind generator set under power grid voltage symmetrical swell, and a method thereof. The shafting oscillation suppression control system is characterized in that a torque differential compensation module consisting of a speed differential module, an electromagnetic torque observation module and a torque differential module is arranged in the control system; and a rotor resultant torque is obtained through the speed differential module. Through adoption of the shafting oscillation suppression control system and the method thereof, the fan transmission shaft torque, the electromagnetic torque and the motor rotating speed oscillation can be suppressed under power grid voltage swell, and the shafting low-frequency oscillation attenuation of the wind generator set is accelerated, so that abrasion of a fan transmission shaft and a gearbox in the case of electric network faults is reduced, and the service life of the fan transmission shaft is prolonged.

A small unmanned plane undercarriage buffer relates to the field of aviation aircrafts and solves problems of low buffering efficiency, easy bounce, low reliability of a present flat spring type buffer. The small unmanned plane undercarriage buffer comprises an external cylinder, a first spring on the external cylinder, an internal cylinder having a damping hole, an air sac between the external cylinder and the internal cylinder; an upper joint, a lower joint, a piston rod extending into the internal cylinder, a piston, a damping plate, a pressure-limiting valve, a check valve, a guide sleeve and a locking cover, wherein the piston rod is orderly covered with the piston, the damping plate and the pressure-limiting plate; the piston rod is orderly covered with the check valve, the guide sleeve and the locking cover; the check valve, the guide sleeve and the locking cover are all disposed in the external cylinder; an internal-external cylinder annular oil storage cavity is formed between the internal cylinder and the external cylinder; the damping plate axially moves along the piston rod; the pressure-limiting plate limits maximum damping force to a preset valve during compression stroke; after the locking cover is tightly screwed, the guide sleeve, the check valve and the internal cylinder are axially pressed to the lower joint; the check valve controls communication between the internal-external cylinder annular oil storage cavity and a right cavity of the internal cylinder; and two ends of a first spring are respectively pressed against the upper and lower joints. The small unmanned plane undercarriage buffer possesses high buffering efficiency, uneasy bounce, stable performance and great reliability.

The invention discloses a damping material, a preparation method thereof and a piezoelectric ceramic ultrasonic probe. The damping material comprises the following components in parts by weight: 60-120 parts of high-molecular polymer, 30-60 parts of inorganic fillers with sheet structure, 5-15 parts of inorganic fillers with ball structure, 0.5-5 parts of silane auxiliaries and 10-30 parts of solvents. The damping material provided by the invention can effectively prevent the long curing time and insufficient conduction caused by the increase of tungsten powder content as well as the interference to the ultrasonic signal caused by the middle layer formed by bonding the damping block with the piezoelectric ceramic wafer of the present damping material; the curing time is stable, the material is non-conducting and the damping coefficient is higher; a filling method is applied to the piezoelectric ceramic ultrasonic probe, so that the vibration damping of the piezoelectric ceramic wafer is greatly increased; the vibration time of the piezoelectric ceramic wafer is shortened; the absorption of the piezoelectric ceramic wafer for the echo signal is benefited; the definition of ultrasonic testing for multilayer gluing structure defect is increased.

The invention belongs to the technical field of structure vibration control, and particularly relates to a parallel damping and spring unit ternary vibration reduction device, a design method and an assembling method. The device comprises a spring unit, a damping unit and an inerter unit. The damping unit is connected with the spring unit in parallel through a connecting piece and then connected with the inerter unit in series to form a parallel damping and spring unit ternary vibration reduction structure. Two ball screw transmission systems are adopted, the parallel damping and spring unit ternary vibration reduction structure is formed, and the tuning function can be achieved for inertia force. Continuous adjustment of the inertia force can be achieved by changing the size of a flywheel, and the energy absorbing capability of the inerter unit can be brought into full play. In addition, the assembling technology is adopted in the device, and the advantages that adjustment is easy, durability is good, and the energy consumption capability is high are achieved.

The invention discloses a high-elasticity durable automobile rubber shock absorbing material. The high-elasticity durable automobile rubber shock absorbing material comprises a shock absorbing material body and a wear-resistant coating which coats the outer side of the shock absorbing material body; the shock absorbing material body is prepared from the following raw materials in parts by weight:20 to 30 parts of EPDM, 20 to 25 parts of butyl rubber, 10 to 15 parts of butadiene rubber, 4 to 7 parts of talcum powder, 2 to 5 parts of a toughening agent, 2 to 4 parts of an antioxidant, 1 to 4 parts of an anti-aging agent, 1 to 3 parts of a coupling agent, 3 to 9 parts of epoxidized soybean oil, 3 to 6 parts of a maleic anhydride compatilizer, 3 to 7 parts of paraffin, 5 to 8 parts of nano-barium sulphate, 2 to 5 parts of modified nano silicon nitride, 1 to 3 parts of potassium stearate, 2 to 5 parts of an accelerant, 2 to 4 parts of a coupling agent, 1 to 2 parts of zinc borate and 3 to7 parts of sulphur. According to the high-elasticity durable automobile rubber shock absorbing material, the wear resistance and the durability of a shock absorbing piece are greatly improved by the wear-resistant coating on the outer side of the shock absorbing material body.

The invention discloses a constant flow static pressure working table for a gear shaping machine or a gear milling machine. By constant flow static pressure technology, a static pressure cavity is formed on a central spindle, and lubricating oil is fed into the static pressure cavity by a constant pressure oil pump, so that an oil film is formed between the spindle of the working table and a pedestal to keep contact surfaces between the spindle and the pedestal in a constant pressure full-liquid lubricating state; therefore, the center of the working table is positioned well, a wear phenomenon is almost avoided during movement, and the rigidity and the accuracy of the working table are greatly improved and the life of the working table is greatly prolonged; and the pedestal is provided with a dual lead worm, and adjusting pads are arranged in both axial direction and radial direction of the worm, so the working table can work under a smaller backlash condition, and the dividing accuracy of a rotary working table can be improved.

The invention discloses a novel floating-type wind turbine foundation platform based on tuning liquid-column vibration dampers. In a ballast compartment, four side stand columns are arranged around acentral stand column. Each side stand column comprises a main stand column and a heaving stand column fixed to the bottom of the main stand column. The central stand column is internally hollow. The main stand columns and the heaving stand columns are internally hollow, and the main stand columns communicate with the heaving stand columns to form independent cylindrical cavities, and an annular partition plate is arranged in each independent cylindrical cavity and divides the independent cylindrical cavity into an inner chamber and an outer chamber. The two outer chambers in independent cylindrical cavities in the two side stand columns located on the same line in a direction parallel to the longitudinal-transverse vibration direction communicate with each other through a longitudinal-transverse horizontal pipeline to form one liquid-column vibration damper. By adoption of the novel floating-type wind turbine foundation platform based on the tuning liquid-column vibration dampers, thevibration response of the platform under a strong coupling sea condition can be effectively reduced, and accordingly, the stability of a whole semi-submersible floating-type fan system is improved.