1190results about How to "Improve vibration damping effect" patented technology

The rail track tie including: a rigid block presenting a bottom face, and a top face for receiving at least one longitudinal rail; a cover for receiving the rigid block and in the form of a rigid shell including a bottom and a peripheral rim around the bottom; and a resilient soleplate disposed between the bottom face of the rigid block and the bottom of the cover. The resilient soleplate has dynamic stiffness k2 lying in the range of 6 kN/mm to 10 kN/mm, and preferably in the range of 6 kN/mm to 8 kN/mm.

The invention provides an active vibration damping system based on absolute displacement feedback and used for realizing active vibration damping on a load. The active vibration damping system comprises at least three vibration damping units used for realizing six degree-of-freedom active vibration damping on the load, wherein each vibration damping unit is provided with an absolute displacement measuring device, and the absolute displacement measuring device is used for detecting the absolute displacement of the load in real time; and a vibration damping control unit is respectively connected with the at least three vibration damping units, and the vibration damping control unit realizes active feedback control according to the absolute displacement. The vibration damping system based on the absolute displacement feedback has the following advantages: an air spring and a linear actuator work together to carry out active vibration damping, and the absolute displacement feedback technique is adopted to effectively improve the vibration damping performance of the vibration damping system, effectively increase position loop bandwidth of the vibration damping system and enhance the positional stability of the vibration damping system; and the active vibration damping system is convenient to use, small in size and lower in cost.

The invention discloses a multi-mode electromagnetic energy-regenerative vehicle active suspension actuator. The multi-mode electromagnetic energy-regenerative vehicle active suspension actuator comprises an actuator main body and an actuator controller, wherein the actuator main body comprises a piston cylinder, a permanent magnet linear motor module, an adjustable damping vibration absorber module, an actuator upper end cover and a lower lifting lug. The permanent magnet linear motor module comprises a secondary piston rod, a linear motor upper end cover, a linear motor lower end cover, a plurality of silicon steel sheets, a plurality of primary coils and a permanent magnet; the adjustable damping vibration absorber module comprises a vibration absorber piston rod, a sleeve, an upper lifting lug, a sealing separation plate, a big piston, a small piston, a damping liquid passage and a proportional electromagnetic valve; and an input end of the actuator controller is connected with an acceleration sensor, a sprung mass speed sensor and an unsprung mass speed sensor. The invention further discloses a control method for the multi-mode electromagnetic energy-regenerative vehicle active suspension actuator. The invention is advantaged in that the energy-regenerative efficiency of the multi-mode electromagnetic energy-regenerative vehicle active suspension actuator is high, the service life of a vehicle-mounted storage battery can be effectively prolonged and an active suspension is in an optimal vibration absorbing state.

The invention relates to a lamp which comprises a lamp body and a damping device connected with the lamp body, wherein the damping device comprises a first mounting plate, a second mounting plate, a connecting rod, a first spring and a second spring; the first mounting plate and the second mounting plate are mutually parallel; the connecting rod is provided with a first end part and a second end part which are opposite; the second end part is penetrated into the first mounting plate and fixed on the second mounting plate; the first spring is clamped between the first mounting plate and the first end part of the connecting rod; the second spring is clamped between the first mounting plate and the second mounting plate and sleeved on the connecting rod; the first mounting plate extends along the axial line direction of the connecting rod to form a first sleeve; and the first spring is at least partially accommodated in the first sleeve. By adopting the structure, the lamp has better damping property and longer service life.

It is an object of the invention to provide a technique for further improving the vibration reducing performance in a power impact tool that linearly drives a tool bit by using a swinging mechanism. According to the invention, a representative power impact tool is provided with a motor, a rotating shaft, a swinging member, a tool driving mechanism and a counter weight. The swinging member is supported by the rotating shaft to swing in the axial direction of the rotating shaft by rotation of the rotating shaft. The counter weight is disposed in a region higher than a lower end region of the swinging member in the vertical direction to intersect with the axis of the rotating shaft, and a lower end of the counter weight is connected to the lower end region of the swinging member. The counter weight extends upward from the connection between the counter weight and the swinging member and has a pivot point in the extending end portion, and when the swinging member swings, the counter weight is driven by the swinging member to rotate in the axial direction of the tool bit, thereby reducing vibration caused in the axial direction of the tool bit.

A vibration damping device in which vibration damping performance of a damper having a chamber holding a rolling member is improved. The vibration damping device is adapted to damp vibrations resulting from a pulsation of torque applied to a rotary member by an oscillating motion of a rolling member connected with the rotary member while being allowed to rotate relatively therewith. The vibration damping device is provided with a casing member enclosing the rolling member, and a sealing member that connects the casing member with the rotary member in a manner such that the rotary member is allowed to rotate relatively with the casing member, while preventing oil from entering into an inner space of the casing member where the rolling member is held to oscillate.

The invention discloses a large dynamic cubic Stewart active vibration control platform which comprises an upper platform body, a lower platform body, an actuator package, a sensor group and connecting pieces. The upper platform body and the lower platform body are each provided with three installation bases in the circumferential direction. Each installation base is provided with one connecting piece. The actuator package and the upper and lower platform bodies are installed through the connecting pieces. Actuator pairs are connected end to end. By means of the designed connecting pieces and the connection way between the actuator pairs and the connecting pieces, the position relation that the actuator pairs are installed with the same included angle is formed. The sensor group is installed on the upper surface of the upper platform body and used for detecting vibration accelerated speed signals of the upper platform body in six directions of degrees of freedom. The large dynamic cubic Stewart active vibration control platform has the advantages that the platform can work in the micro-amplitude low-frequency environment, the platform rotating space can range from -15 degrees to +15 degrees, the damping effect is about 98%, a vibration reduction control system is based on the platform, and the platform is convenient to operate and controllable.

A prepreg containing components (A) to (C) defined below, wherein component (A) is placed on one surface or both surfaces of a layer comprising components (B) and (C), 90% or more by area of component (A) being present in a region(s) extending from the surface(s) of the resulting prepreg containing components (A) to (C) to a depth equal to 20% of the average thickness of the prepreg: (A) urethane particles having tan δ of 0.15 or more at 10° C. and having a three-dimensional cross-linked structure, (B) a first epoxy resin composition, and (C) reinforcing fiber. The present invention provides a fiber-reinforced composite material which excels in rigidity, strength, and vibration damping properties, and a prepreg which is suitably used for production thereof, and also provides methods for production thereof.

The invention discloses a suspension type multidimensional impact vibration reduction damper which comprises an external container box. A partition plate with a circular hole is horizontally arranged in the external container box and divides the external container box into two spaces, fluid viscous dampers and springs are arranged on the partition plate, the upper ends of the fluid viscous dampers and the upper ends of the springs are connected with a circular plate which does not make contact with the external container box, the lower ends of the fluid viscous dampers and the lower ends of the springs are connected to the partition plate, the center of the circular plate is provided with a rigid connecting rod which penetrates through the circular hole in the center of the partition plate and is connected with an internal cylinder box, the bottom end of the rigid connecting rod is connected with an internal metal box, a rigid hanging rod is arranged in the internal metal box, and the bottom of the rigid hanging rod is connected with a mass ball. The suspension type multidimensional impact vibration reduction damper can reduce the multidimensional vibration response of a structure under the action of an earthquake or a wind load and can effectively make up for the hidden danger brought by the uncertain direction when a load is generated.

Provided is a shock absorber, comprising an oil storage cylinder (13), a working cylinder (14), a piston rod (6), a guiding and sealing assembly used to guide the movement of the piston rod (6), and an expansion and circulation valve assembly and a compression and compensation valve assembly provided on a piston (16). The guiding and sealing assembly comprises a guide seat (27, 29) and an oil seal (34) located at the upper end of the guide seat. The face of the upper end of the guide seat (27, 29) is formed with an oil storage groove, and the oil storage groove has an oil-air separation contact surface (35). An elastic separation lip (36) is formed on the oil seal (34) and the elastic separation lip (36) is in airtight contact with the oil-air separation contact surface (35) such that the oil storage groove is separated into an outside part and an inside part. Moreover, further provided are a vehicle suspension system and a vehicle comprising the shock absorber. The piston rod of the shock absorber has good movement stability, the friction between the piston and the inner wall of the working cylinder is low, and the shock absorber has a long service life and has significantly improved dampening effects.

The invention discloses a coaxial integrated air spring absorber with linkage and controllable rigidity and damping, belonging to the technical field of vehicle active suspensions. The coaxial integrated air spring absorber mainly comprises an air spring, a hydraulic absorber main body and a stepping motor assembly, a compression air inflation assembly and an air pressure sensor as well as an airspring deflation assembly and an electromagnetic valve. The air spring and the hydraulic absorber are of a coaxial integrated structure which has compacter structure and is convenient to be installedon a vehicle; the air spring and the absorber realize the associated change of damping and rigidity through a shared air chamber, thereby automatically balancing internal acting force conflict of theair spring and the absorber and being capable of alleviating the shock and violent vibration between a frame and wheels by utilizing the compressibility of air medium and the fluidity of oil medium; and the absorber is not provided with a bottom valve assembly, and a piston assembly comprises a recovery damper valve and a compression damper valve, therefore the structure of the absorber is simplified.

The invention provides a semi-driving type variable stiffness dynamic vibration absorber made from conical springs, belonging to the technical field of vibration control. The semi-driving type variable stiffness dynamic vibration absorber comprises two mass blocks, a high-stiffness plate, two small-stiffness plates, two conical springs, a threaded rod, a stepping motor and a real-time monitoring and controlling system. The weights of the two mass blocks are the same, the two mass blocks are respectively arranged at two ends of the upper surface of the high-stiffness plate with a center hole, one large-diameter ends of the conical springs are respectively fixed at the upper surface and the lower surface of the high-stiffness plate, one small-diameter ends of the conical springs are respectively fixed on the two small-stiffness plates, one small-stiffness plate is fixedly arranged in a main structure, the threaded rod penetrates through the circular hole of the high-stiffness plate, two ends of the threaded rod are respectively in threaded connection with the small-stiffness plates, the directions of screw threads are opposite to one another, the top end of the thread rod is connected with an output end of the stepping motor, and the output end of the stepping motor is electrically connected with the real-time monitoring and controlling system. According to the semi-driving type variable stiffness dynamic vibration absorber, the semi-driving type control is easy to realize, the stiffness can be continuously adjusted, the semi-driving type variable stiffness dynamic vibration absorber is good in vibration absorbing effect, large in vibration absorbing range, quick in response, high in precision, and small in energy consumption.

The present invention provides an emulsion for vibration damping materials which stably exhibits excellent vibration damping property in a wide temperature range and exhibits excellent mechanical stability and which can be preferably used in various applications where a coating vibration damping material is used. The emulsion for vibration damping materials of the present invention is an emulsion for vibration damping materials, including an emulsion obtainable by emulsion polymerization of a monomer component, wherein the emulsion has a storage modulus value of 5.0×10^{7 to 8.0×108} Pa at 20° C. and a storage modulus value of 1.0×10⁵ to 5.0×10⁶ Pa at 50° C., the emulsion has a loss modulus value of 4.0×10⁷ to 4.0×10⁸ Pa at 20° C. and a loss modulus value 1.0×10⁵ to 7.0×10⁶ Pa at 50° C., the emulsion has a maximum peak of a loss tangent of 1.3 or more in a range from 20 to 50° C., and a vibration damping composition including the emulsion has an aggregation ratio of 0.01 or less, the aggregation ratio being measured by a mechanical stability test in accordance with JIS K6828:1996.

A fluid-filled vibration damping device including: a partition member having first and second partition plates overlapping, and a holding area formed between overlapping surfaces of center parts of the two partition plates; and a movable membrane held and arranged in the holding area. A claw-shaped part and a perforation window are formed at respective corresponding positions of outer circumference parts of the two partition plates, and a fixing mechanism is constituted with the claw-shaped part latched in a circumference edge part of the perforation window. A widening area is provided between an outer circumference surface of the movable membrane and an inner circumference surface of the holding area by partially making a large distance therebetween. At least one of the two partition plates has a first air vent hole piercing a part constituting a wall part of the widening area.

The invention discloses a semi-active particle vibration damping device with a truss structure. The truss structure is connected with a structure to be damped, the vibration damping device comprises magnetic-permeable metal particles, a coil, a current control module, a vibration pickup sensor and a direct-current power module, the magnetic-permeable metal particles are filled in a hollow steel tube of the truss structure, the coil is wound on the outer wall of the hollow steel tube, the current control module is connected with the coil, the vibration pickup sensor is disposed on the structure to be damped, and the current control module receives vibration signals picked up by the vibration pickup sensor and controls the direct-current signal module to output corresponding current to the coil after the vibration signals are processed. The vibration frequency of the structure to be damped can be tracked, the optimal damping ratio of a particle damper can be quickly adjusted, and accordingly the vibration attenuation performance of the semi-active particle vibration damping device within a broader frequency band range is improved. In addition, the semi-active particle vibration damping device is simple in structure and high in adaptability, and an extra space is omitted.

A damper includes: a cylinder; a piston rod disposed to be movable linearly in the cylinder; and a plurality of damping members installed between the cylinder and the piston rod, and generating a damping force by multi-stage so that when a vibration transmitted from the cylinder to the piston rod or from the piston rod to the cylinder is big, a strong damping force is generated, whereas when a vibration is small, a weak damping force is generated. A damping force is generated by stages depending on a displacement of a vibration transferred from the cylinder to the piston or from the piston to the cylinder. If a small amount of vibration is transferred, a weak damping force is generated, whereas if a large amount of vibration is transferred, a strong damping force is generated. Accordingly, a vibration damping performance can be improved.

The invention discloses a vibration damper and a downhole drill comprising the same. The vibration damper comprises a first joint and a second joint, and the first joint and the second joint are respectively provided with a central through hole. The vibration damper is characterized in that the second joint comprises a piston body; the piston body and the first joint can be longitudinally and glidingly matched; a first cavity is formed between one end of the piston body, which faces the first joint, and the first cavity is communicated with the central through hole of the first joint. When the vibration damper is utilized, the second joint compresses high-pressure gas in the first cavity to enable the volume of the first cavity to generate changes, and the high-pressure gas in the first cavity absorbs vibration energy to achieve the goals of buffering and vibration damping; due to the fact that the pressure change of the high-pressure gas is smaller, the change of an acting force transferred to the first joint through the first cavity is smaller, and further, the peak value of an impact force transferred to the first joint by the second joint can be better limited, and the impact vibration is reduced so that the vibration damper has more superior vibration damping effect.

A torsional vibration reducing device includes: a rotating body; an inertial body; a coupling member configured to transmit the torque to the rotating body and to the inertial body; and a first coupling portion and a second coupling portion, which are separately provided to either the rotating body or the inertial body The first coupling portion engages with the coupling member so as to: restrict movement of the coupling member in a rotational direction of the rotating body; and allow movement of the coupling member in a radial direction of the rotating body. The second coupling portion engages with the coupling member such that when the rotating body and the inertial body rotate relative to each other, a contact portion of the coupling member with respect to the first coupling portion moves in the radial direction of the rotating body.

The invention discloses an electrically operated valve, aiming at the problems that the elasticity of a stopping part for preventing a coil from being loosened corresponding to a valve body is low in the prior art; the technical proposal of the invention comprises a valve seat, a valve needle, the stopping part and a stepping motor which is composed of a rotor and a stator for driving the valve needle and the valve seat to joint or detach; the stopping part is fixedly connected with a stator coil box, and internally concave bending parts which are opposite are additionally arranged above externally convex bending parts on two arm parts extended downwards thereof respectively. As the two arm parts of the stopping part are respectively provided with two bending parts, higher elasticity is obtained under the condition of same deformation, the fixation is reliable and the working noise is low; the valve has the advantages of compact structure and good assembling operability; moreover, the vibration reduction is greatly improved for obtaining accurate flow control; therefore, the valve is particularly suitable for refrigerators, air conditioning refrigerating units, water heaters and dehumidifiers, thus realizing defrosting, the flow control and on-off control and the like of a heating system.

The invention discloses a hybrid shock absorber based on a Stewart structure. The hybrid shock absorber comprises an upper top plate, a lower bottom plate and six shock absorption units obliquely arranged between the upper top plate and the lower bottom plate in the circumferential direction. The upper end of each shock absorption unit is connected with the upper top plate through an upper rod endjoint bearing, and the lower end of each shock absorption unit is connected with the lower bottom plate through a lower rod end joint bearing. Every two adjacent shock absorption units are mutually symmetrical, and the included angles between the shock absorption units and the upper top plate and the included angles between the shock absorption units and the lower bottom plate are all equal. Theshock absorption units comprise upper end covers, lower end covers, upper diaphragm springs, magnetic eddy current dampers and lower diaphragm springs, wherein the upper diaphragm springs, the magnetic eddy current dampers and the lower diaphragm springs are sequentially connected from top to bottom. The upper end covers and the upper diaphragm springs are fixed to the upper sides of the magneticeddy current dampers from top to bottom, and the lower diaphragm springs and the lower end covers are fixed to the lower sides of the magnetic eddy current dampers from top to bottom. Through matchedusing of the diaphragm springs and the eddy current dampers, the shock absorption effect is greatly enhanced, the whole hybrid shock absorber is a simple in structure, and six-degree-of-freedom shockabsorption can be achieved.

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.