40results about How to "Reduce vibration load" patented technology

The invention discloses an individual pitch control system and method for a wind driven generator. The system comprises a wind driven generator unit, a state observer and a disturbance accommodating controller; the state observer and the disturbance accommodating controller are additionally arranged in the system according to control input and interference input, the gain coefficients Gx and Gd are adjusted according to the specific circumstances to control the influences of errors and the interference input, and finally individual pitch control is achieved. According to the individual pitch control system and method for the wind driven generator, an individual pitch control strategy based on a linear quadratic regulator and a disturbance accommodating control technology is adopted, the problems that wind wheels of the wind driven generator are loaded are solved, the operation life of the wind driven generator is prolonged, the vibration load of the wind driven generator is effectively reduced, and the purpose of vibration reduction is well achieved; meanwhile, the disturbance accommodating control technology is introduced to inhibit or reduce the influences of the wind speed, the turbulent flow, the wind shear and tower shadow effects and the like on the wind driven generator, and the robustness of the system is improved.

The invention relates to a damping spring vibration-proof hammer preventing lead vibration and galloping in a power transmission line. The hammer is characterized in that: the hammer comprises a damping spring vibration damper and a wire clamp; the damping spring vibration damper comprises a cylindrical shell which is provided with a piston rod; an upper end and a lower end of the piston rod are installed with locating plates; springs and damping rubber sleeves are provided between the locating plates; the damping rubber sleeves are sleeved on the springs; In the wire clamp, a wire clamp main body is hinged to an upper end of wire clamp gland; the wire clamp main body and an lower end of the wire clamp gland are fixedly connected with the upper end of the piston rod of the damping spring vibration damper; an inside bottom of the cylindrical shell is provided with a counterweight plate; and a antiskid rubber gasket for clamping a lead is provided between the wire clamp main body and the wire clamp gland of the wire clamp. The damping spring vibration-proof hammer in the invention has the advantages of reasonable composition, good effect of power transmission line lead vibration damping and galloping proof, low cost, convenient installation and replacement, safe and reliable use, long work life, strong adaptability of working environment and the like.

A compression-shear mixed multi-layer magnetorheological elastomer shock absorber comprises a magnetic conductive tube mounted on a base, a piston mounted in the magnetic conductive tube, a magnet exciting coil mounted on the outer wall of a mounting seat arranged on the base as well as magnetorheological elastomers, wherein the magnetorheological elastomers comprise a shear type first magnetorheological elastomer and compression type second magnetorheological elastomers; the first magnetorheological elastomer is mounted between the piston and the magnetic conductive tube; a shock absorbing layer structure is mounted between the mounting seat and the piston and comprises the second magnetorheological elastomers and magnetic conductive plates, and the second magnetorheological elastomers and the magnetic conductive plates are arranged alternately. According to the compression-shear mixed multi-layer magnetorheological elastomer shock absorber, under joint action of the shear type magnetorheological elastomer and the compression type magnetorheological elastomers, the adjusting ranges of the rigidity and damping of the shock absorber are increased, the shock absorbing effect is enhanced, and the shock absorber can attenuate vibration load of different frequency and amplitudes.

The invention provides a satellite structure for realizing satellite-rocket vibration isolation based on an elastic airbag. The satellite structure comprises a satellite root vibration isolation airbag assembly fixed between a satellite-rocket connection separation device and a satellite body root, and a satellite top anti-collision airbag assembly, wherein one end of the satellite top anti-collision airbag assembly is fixed at corners at the top of the satellite body, and the other end of the satellite top anti-collision airbag assembly is close to the inner wall of a rocket firing; the satellite root vibration isolation airbag assembly comprises high-strength sealed airbags filled with high-pressure gas, and is used for isolating the vibration impact load of satellite-rocket installation interface transfer and supporting and fixing the satellite body; and the satellite top anti-collision airbag assembly also comprises high-strength sealed airbags filled with high-pressure gas, and is used as anti-collision cushion for the satellite and the inner wall of the rocket firing when the vibration displacement of the satellite top is overlarge, so as to avoid damage of the collision load on the satellite structure. The satellite structure is simple in structure mode and remarkable in vibration isolation effect, and can be used for effectively reducing the vibration load endured by a satellite product and greatly reducing the development cost of satellite components.

The invention discloses a transmission system of coal mine machinery, which comprises a power part used to provide power to the coal mine machinery; and the power part is a variable frequency motor (21) which is arranged at an appropriate position of the coal mine machinery body. The whole starting process of the variable frequency motor (21) does not produce impact torque, the variable frequency motor is smoothly started, to significantly reduce the vibration load that the transmission system bears when the coal mine machinery is started, so as to improve the transmission reliability and the working safety of the coal mine machinery. The invention also discloses the coal mine machinery which comprises the transmission system.

The invention discloses a novel embedded ducted propeller driven blade which comprises a blade part, an embedded ducted propeller and a blade root connector, wherein the embedded ducted propeller is arranged at a blade tip of the blade part; the blade root connector is arranged at a blade root of the blade part; the blade root connector is connected with a main rotor shaft; the embedded ducted propeller comprises vanes, a fairing, a hub and an embedded duct; the hub is arranged in the center of the embedded duct; the fairing is arranged at the top end of the hub; the vanes are distributed in an annular space formed by the embedded duct and the hub; one end of each vane is connected with the hub; the other ends of the vanes are slidingly connected with a slide rail circumferentially arranged on an inner wall of the embedded duct; the hub is internally provided with a driving device; and the vanes are driven by the driving device to rotate. According to the novel embedded ducted propeller driven blade, a complicated and cumbersome mechanical transmission system and a reactive torque system can be cancelled; the weight efficiency of a helicopter is improved; the rotor performance is improved at the same time; and vibration and noise are inhibited.

The invention discloses an undercarriage with an oil-gas buffer type longitudinal buffeting reduction device. An oil-gas buffer is adopted to replace a resistance supporting rod on the lower part of acourse supporting rod of a main undercarriage body, and a set of resistance supporting rod mechanism is additionally arranged between a main undercarriage outer barrel and the course supporting rod to alleviate the longitudinal vibration phenomenon of the main undercarriage body. The additionally-arranged course supporting rod can bear the course torque of an undercarriage supporting column, by utilizing the elasticity and damping characteristics of the oil-gas buffer, vibration energy transmitted from the ground and a braking device in the braking and sliding process of the undercarriage canbe rapidly absorbed, vibration force is reduced, and the dynamic stability performance of an undercarriage system is improved.

The invention discloses a chassis under limited conditions, comprising a car frame, front and back axles, a leaf spring suspension, a car engine, a clutch, a car gearbox, a transfer case and a fuel tank. The chassis is characterized in that car frame has narrow front and wide back structure; a chassis roll cage which can improve torsional rigidity of the car frame is arranged in the middle of the car frame; the engine and the car gearbox are separately arranged; the engine is at the front end of the car frame; the car clutch is arranged at an output end of the engine; the car gearbox is at the middle position of the car frame and is connected with the clutch through a driving shaft. The chassis has simple structure, low cost, safe driving and good passing ability under complex road conditions such as muddy road, grassland, desert and the like.

The invention relates to a vibration reducing control device used for a manual soil compacting machine, and is particularly suitable for a plate compactor. At least a segment of the device is flexible and bendable. Such design can obviously reduce vibration transmission from an exciter to an operator. Additionally, the control device in the invention is advantaged by low production cost and simple adding.

The invention discloses an electric control type wood leftover material classifying and screening device, and relates to the technical field of wood processing devices. The electric control type woodleftover material classifying and screening device comprises a support, wherein a box body is rotatably connected onto the support; a rotating motor is installed at the bottom of the support; the output end of the rotating motor drives the box body to rotate around the horizontal axial direction of the box body through a synchronous belt; a feeding bin door is installed on the top side of the boxbody; a discharging bin door is installed on the bottom side of the box body; a vibration motor is installed in the box body; and the box body is connected with a thermal control screen plate in a sealed and sliding mode along the axial horizontal plane of the box body. According to the electric control type wood leftover material classifying and screening device provided by the invention, a controller controls multiple electric heating wires to be powered on and dynamically adjusts the power-on intensity of the electric heating wires under feedback signals of a temperature sensor, and stabletemperature control is formed, so that different temperatures of the electric heating wires are controlled; and at the moment, memory metal sheets wound by the electric heating wires are heated and expanded at different temperatures to form different radius states, so that wood with different particle sizes can be screened, and multi-stage screening can be completed by one thermal control screen plate.

The invention provides a helicopter damping device and a control method thereof. The damping device comprises a main damping supporting rod, a first measuring element, a second measuring element, a controller unit and an active control force output device. The first measuring element and the second measuring element are used to measure a vibration load signal transmitted to a fuselage by the maindamping supporting rod and a vibration signal of the active control force output device; and the controller unit controls the active control force output device to generate active control force according to the vibration signal and the vibration load signal in a self-adaptive feedforward control and feedback control combined mode, so that the vibration load of the fuselage is reduced. The device is provided with the active control force output device, and active control of rotor wing-main damping dynamic load transmitted to the fuselage is achieved by driving the active control force output device, thereby overcoming the technical defects that the control performance is poor and the vibration level of a rotor wing-main damping system is increased due to the fact that the main damping supporting rod is directly driven by traditional active control, and effectively reducing the vibration level of the fuselage.

The invention discloses a high-energy consumption viscoelastic vibration isolating damper for an engine. The high-energy consumption viscoelastic vibration isolating damper comprises an upper damping block and a lower damping block, wherein the upper damping block comprises a central shaft, a high-energy consumption viscoelastic material fixed on the central shaft, an upper metal gasket arranged on the top surface of the high-energy consumption viscoelastic material and an upper support arranged on the lower part of the high-energy consumption viscoelastic material; the lower damping block comprises the high-energy consumption viscoelastic material, a lower metal gasket arranged on the bottom surface of the high-energy consumption viscoelastic material and a lower support arranged on the upper part of the high-energy consumption viscoelastic material. According to the vibration isolating damper, the high-energy consumption viscoelastic material can increase damping ratio of a structural system and enhance a vibration isolating effect of a low-frequency area, so the vibration isolation and vibration damping effects are achieved.

The invention provides an oscillation isolation device for a satellite borne temperature-compensation crystal oscillator. The oscillation isolation device comprises an oscillation isolation box body, a crystal oscillator circuit printed plate, and a quartz oscillator, wherein a rigid mounting table is mounted in the oscillation isolation box body; the quartz oscillator is directly fixed on the rigid mounting table through an elastic fastening clamp, and is electrically connected with the crystal oscillator circuit printed plate; bolts are mounted on bases of the oscillation isolation box body; oscillation isolation damper sleeve pipes are designed on the bases. The oscillation isolation device can realize functions of oscillation isolation and heat radiation, and is particularly suitable for oscillation isolation and oscillation reduction of objects which are small in size and sensitive to temperature of a satellite borne temperature-compensation crystal oscillator, and the like.

The invention discloses a method for judging the landslide type of a coastal underwater soft soil slope under the action of a cyclic dynamic load. Arrangement is performed according to a GDS dynamic triaxial test result to obtain an axial strain-cycle index diagram, a hyper-static pore water pressure-cycle index diagram, a partial stress-axial strain diagram and a partial stress-average effectiveforce diagram, and the diagrams are used for describing typical damage forms of a soil body under different cyclic dynamic load conditions, and are in one-to-one correspondence with landslide types ofdifferent coastal underwater soft soil slopes to achieve that the coastal underwater soft soil slope landslide types caused by cyclic dynamic loads are determined through an indoor geotechnical testmethod. According to the method, the landslide type of the coastal underwater soft soil slope under the power cycle load condition can be pre-judged through the soil body damage characteristics, and the feasibility of preventing and reducing coastal underwater soft soil slope landslide hazards caused by power cycle loads by taking effective measures in advance in the design and construction stagesof various projects related to the coastal underwater soft soil slope is improved.

The invention discloses a safety oscillation damping vibrating screen which comprises a machine base, a motor, a vibration excitation balancer and a screen box. The safety oscillation damping vibrating screen is characterized in that the motor is fixed on the machine base, and is connected with a spindle of the vibration excitation balancer through a power transmission belt; the screen box is arranged at the eccentric position of the spindle of the vibration excitation balancer, and a supporting spring is arranged between the vibration excitation balancer and the machine base; the power of the motor is transmitted to the spindle of the vibration excitation balancer through the power transmission belt, so that the screen box is driven to make circular movement to classify or dewater materials. The safety oscillation damping vibrating screen has the advantages that the manufacturing cost is low, using is safe and reliable, the obvious energy-saving effect is achieved, vibration loads can be attenuated, and the vibration strength is high.

The invention discloses a flexible unloading device which is used for uniformly unloading vertical pump pipe force for concrete conveying of high-rise buildings. The flexible unloading device comprises a base, a rubber base plate, a force transmission device and a rubber gasket, wherein each component is composed of two symmetrical parts, so that the unloading device is convenient to mount and dismount; the base is attached to the upper surface of a poured component; the force transmission device is arranged at the upper part of the base; the rubber base plate is arranged between the force transmission device and the base; the force transmission device is arranged on the outer side of a pump pipe; and the rubber gasket is arranged between the force transmission device and the pump pipe. According to the flexible unloading device, through uniform layer-by-layer unloading, damage to the pump pipe and damage to a floor slab due to stress concentration are prevented.

The cab is situated on the body frame. The engine cover is situated in front of the cab. The engine includes the crankshaft extending in the longitudinal direction of the bulldozer. The air cleaner is situated above the engine. The air cleaner is secured to the engine cover. The duct connects the air cleaner and the engine. The duct includes the first connector and the second connector. The first connector is connected to the engine. The second connector is connected to the air cleaner. The front mounting part supports the engine on the body frame. The rear mounting part supports the engine on the body frame. The rear mounting part is situated behind and above the front mounting part.

A four-valve motorcycle engine valve clearance adjusting structure comprises a valve rocker with one end driven by cam; output end of the valve rocker drives the valve rod; upper end of the valve rod is installed with valve clearance adjusting gasket; output end of the valve rocker is directly contacted with the valve clearance adjusting gasket to drive the valve rod. The present invention skillfully uses the different thicknesses of the corresponding valve clearance adjusting gaskets to adjust the clearance between the rocker and the valve according to the valve clearances between each valve. This structure leads the transmission mechanism of the motorcycle to be simpler and compacter, the transmission link of the movement rule be less and is able to reduce the elastic deformation and transferring error of the whole mechanism. Because the valve rocker which is directly transfers with the output end of the valve rocker is a valve rocker with better rigidity and intensity, the rigidity of the whole transmission mechanism is greatly improved, the additional vibration load is greatly reduced; the invention is able to improve the rotating speed, increase the power and is good for improving the motivity of the whole generator.

The invention relates to a shock absorption structure of a pull rod suspension device. The shock absorption structure comprises a connection fork lug of a pull rod end, a connection hole which is arranged on the suspension device and a connection bolt, a shock-absorption shaft sleeve is embedded in the connection hole of a suspension device connection seat, the connection bolt runs through a central hole of the shock-absorption shaft sleeve, the shock-absorption shaft sleeve is formed by connecting a left half shaft sleeve and a right half shaft sleeve, which are symmetric to each other, each half shaft sleeve comprises an inner shaft sleeve and an outer shaft sleeve, which are made of two different materials, the abrasion resistance of the inner shaft sleeve is better than that of the outer shaft sleeve, the elasticity of the outer shaft sleeve is better than that of the inner shaft sleeve, the side wall of the outer shaft sleeve is provided with a shock-absorption groove, and the cross section of the inner shaft sleeve is a T-shaped structure.

The invention belongs to the technical field of steelmaking and continuous casting of steel, and particularly relates to a process organization method for quickly replacing a tundish of a continuous casting machine with a section of 600kg / m or under of a special-shaped blank. The invention provides a technological operation method and device for quick replacement of a 600kg / m-or-under special-shaped blank continuous casting tundish. By taking measures, the process time of quick replacement of the tundish is shortened, the vibration load is reduced by reducing friction force, and the problem that vibration cannot be achieved in the small-section quick replacement process of the special-shaped blank is solved. The success of the small-section tundish quick replacement fills the blank of thesmall-section tundish quick replacement of the special-shaped blank continuous casting machine in China.

The invention discloses an airplane landing gear with an anti-buffeting device. The airplane landing gear comprises a main landing gear body, airplane wheels and an upper resistance supporting rod (2); the airplane landing gear further comprises a lower resistance anti-buffeting device (A), the upper end of the lower resistance anti-buffeting device is hinged to the upper resistance supporting rod(2), and the lower end of the lower resistance anti-buffeting device is hinged to the lower end of a main landing gear supporting column outer cylinder (1); the lower resistance anti-buffeting device(A) comprises an upper connector (31), a lower connector (31), a rigid spring sheet damper (a) and a rigid spring sheet damper (b), and the rigid spring sheet damper (a) and the rigid spring sheet damper (b) are fixed between the upper and lower connectors. According to the airplane landing gear, dissipation of the landing gear under the vertical sliding buffeting state on the ground is achieved,and the situation of severe buffeting during slide of an airplane on the ground is avoided; vibration energy induced by a low-frequency brake can be effectively absorbed, the vibration amplitude andvibration load are greatly lowered, and the problem is solved that due to buffeting, the jolt phenomenon during taking is aggravated, parts are damaged, and the service life is shortened.

The invention discloses an active load reducing device for a sudden load of an aero-engine tester. According to the device, a pneumatic chuck is fixed on the upper surface of a chuck support; a working sleeve at one end of a variable stiffness elastic support is arranged in the inner surface of the pneumatic chuck; a flange at the other end of the variable stiffness elastic support is connected with a simulation tester; a three-jaw chuck at one end face of the pneumatic chuck is in a clamping state when the three-jaw chuck is powered on and is in a release state when the three-jaw chuck is powered off; and the variable rigidity elastic support is clamped by adjusting the distance between chuck jaws. The device disclosed by the invention has the beneficial effects that by utilizing the variable stiffness elastic support, the support stiffness is adaptively changed and the critical rotation speed of a rotor system is significantly changed, thereby reducing an impact load of a blade flying off the rotor system and providing experimental support for the safety design of the rotor system when a sudden imbalance occurs; and the device has the characteristics of low cost, good repeatability and implementation convenience.

The invention discloses a device for lowering fluid pulsation impact. The device for lowering fluid pulsation impact is of an inverted-L shape on the whole. The device for lowering fluid pulsation impact comprises a first pipe, a second pipe, a third pipe, a fourth pipe, a fifth pipe and a sixth pipe, wherein the first pipe, the second pipe, the third pipe, the fourth pipe, the fifth pipe and thesixth pipe are sequentially connected and communicate. The axle wires of the first pipe, the second pipe, the third pipe, the fourth pipe, the fifth pipe and the sixth pipe are all located in the sameplane. The first pipe is a horizontal straight pipe. The second pipe is a bent pipe. The third pipe is a vertical straight pipe. The fourth pipe and the fifth pipe are bent pipes. The sixth pipe is avertical straight pipe. The first pipe and the third pipe are connected through the second pipe, the third pipe and the sixth pipe are connected through the fourth pipe and the fifth pipe so that thefirst pipe and the third pipe are perpendicular to each other, and the third pipe and the sixth pipe are parallel with each other. According to the device for lowering fluid pulsation impact, throughan elbow connection manner, vibration load of a liquid input pipeline can be lowered, and the pulsation impact pressure of a liquid in the liquid input pipeline on a volumetric pump is buffered.

The invention relates to an injector mount (1) for accommodating at least one injector (10) completely, comprising a housing (20) having at least one injector chamber (9), wherein the at least one injector chamber (9) comprises a first opening (2) and a second opening (3). It is possible for the first opening (2) of the injector chamber (9) to be connected to a region (12) of an exhaust line (8) that conducts exhaust gas, and for the second opening (3) of the injector chamber (9) to be closed repeatedly by means of a closure (6).

The invention relates to a multi-functional adjustable bridge electromagnetic damper and bridge, which comprises: a cylinder body, a fixed electromagnetic head is arranged in the cylinder body; a piston rod, which has a first end pierced in the cylinder body ; By controlling the magnetic pole of the fixed electromagnetic head to be opposite or the same as the magnetic pole of the first end, the cylinder body and the piston rod are locked or unlocked. The invention relates to a multifunctional adjustable bridge electromagnetic damper and the bridge, which can be used in various states of the bridge, and the bridge does not need to be dismantled after the bridge is built, which saves the temporary consolidation device of the tower and girder during the construction of the cable-stayed bridge Resources, reduce construction procedures and links, speed up the progress of the project, facilitate centralized control of construction operations, and ensure construction quality and safety.

A satellite structure for satellite rocket vibration isolation based on elastic airbags, including a satellite root vibration isolation airbag group fixed between the satellite rocket connection and separation device and the root of the satellite body; one end is fixed at each corner of the top of the satellite body, and the other end is close to the rocket The anti-collision airbag group at the top of the satellite at the inner wall of the fairing; the vibration isolation airbag group at the base of the satellite is composed of a high-strength sealed airbag filled with high-pressure gas, which is used to isolate the vibration and impact load transmitted by the installation interface of the satellite and rocket, and at the same time support and fix the satellite body The anti-collision airbag group on the top of the satellite is also composed of high-strength sealed airbags filled with high-pressure gas. When the vibration displacement of the top of the satellite is too large, it acts as an anti-collision buffer for the satellite and the inner wall of the rocket fairing to avoid damage to the satellite structure caused by the impact load; The invention has simple structure and obvious vibration isolation effect, can effectively reduce the vibration load on satellite products, and can greatly reduce the development cost of satellite components.

The invention discloses an active load reducing device for a sudden load of an aero-engine tester. According to the device, a pneumatic chuck is fixed on the upper surface of a chuck support; a working sleeve at one end of a variable stiffness elastic support is arranged in the inner surface of the pneumatic chuck; a flange at the other end of the variable stiffness elastic support is connected with a simulation tester; a three-jaw chuck at one end face of the pneumatic chuck is in a clamping state when the three-jaw chuck is powered on and is in a release state when the three-jaw chuck is powered off; and the variable rigidity elastic support is clamped by adjusting the distance between chuck jaws. The device disclosed by the invention has the beneficial effects that by utilizing the variable stiffness elastic support, the support stiffness is adaptively changed and the critical rotation speed of a rotor system is significantly changed, thereby reducing an impact load of a blade flying off the rotor system and providing experimental support for the safety design of the rotor system when a sudden imbalance occurs; and the device has the characteristics of low cost, good repeatability and implementation convenience.

The invention discloses a flexible unloading device, which is used for uniform unloading of the vertical pump pipe force of concrete conveying in high-rise buildings. It includes a base, a rubber backing plate, a force transmission device and a rubber washer. , to facilitate the installation and disassembly of the unloading device; the base is attached to the upper surface of the cast member, the force transmission device is arranged on the upper part of the base, a rubber pad is arranged between the force transmission device and the base, and the force transmission device is set On the outside of the pump tube, a rubber gasket is arranged between the force transmission device and the pump tube. The device unloads uniformly layer by layer to prevent damage to the pump tube and damage to the floor due to stress concentration.

Embodiments of the present invention provide a method and device for suppressing mechanical vibration of a wind power generating set and a wind power generating set. The method includes: acquiring the mechanical vibration condition of the wind generating set through a vibration sensor, the mechanical vibration condition of the wind generating set including the vibration frequency of the wind generating set; and controlling the output power of the wind generating set according to the mechanical vibration condition of the wind generating set Harmonic power is injected into the loop to make the wind power generating set generate active vibration, which is used to offset the mechanical vibration of the wind power generating set, wherein the frequency of the injected harmonic power is equal to the vibration frequency of the wind power generating set. Therefore, the purpose of reducing the overall vibration load of the wind power generating set can be achieved, and the service life of the wind power generating set can be improved.