194results about How to "Reduce vibrational energy" patented technology

Provided are a seismic control bearing device capable of absorbing and/or blocking vibration energy transmitted to structures due to earthquakes, and so on, as well as actively controlling various dynamic behaviors generated from the structures with low power and without additional equipment, and a seismic control system including the same. The seismic control bearing device is installed between a ground base and a structure constructed on the ground base to reduce vibration energy applied to the structure, and includes a plurality of deposition members spaced apart from each other; and a plurality of magneto-sensitive members disposed between the deposition members and formed of a magneto-sensitive material. The properties including a stiffness coefficient and an damping coefficient of the magneto-sensitive material are varied depending on a variation of a magnetic field formed around the magneto-sensitive member.

An improved vibration damping system is provided for use with window structures. The window damping system employs both air-film damping technology and viscoelastic damping materials to increase mechanical and/or acoustic vibration damping in window structures.

The invention provides a novel vibration control device with vibration isolation and absorption functions. The novel vibration control device comprises an outer corrugated pipe, an inner corrugated pipe, an upper end plate, a lower end plate and a mass block; the upper end plate and the lower end plate are in bolted connection with mechanical equipment and an installation base by the aid of through holes; the outer corrugated pipe is fixedly connected with the upper end plate and the lower end plate in a welded manner and realizes effects of a vibration isolator; and two ends of the inner corrugated pipe are respectively fixedly connected with an inner cover and the mass block, and the axial rigidity of the inner corrugated pipe and the mass of the mass block are adjusted, so that effects of a vibration absorber can be realized. Accordingly, the novel vibration control device has the vibration isolation and power vibration absorption functions, has the advantage of compact structure, and can easily solve the problem of difficulty in controlling vibration of mechanical equipment which is arranged at a small spatial position and is incapable of being simultaneously provided with vibration isolation and absorption devices.

The invention relates to a damping vibration-isolating compound track bed for a metro and a construction method thereof. The track bed comprises concrete layers and EPS (Expanded Poly Styrol) layers which are arranged at intervals, wherein the quantity of the concrete layers is three or four; the quantity of the EPS layers is two or three; the top layer and the bottom layer are both concrete layers; the EPS layers and the poured concrete layers are fixed by small steel chisels; the concrete layers meet the C35 standard; a demand on the density of the EPS layers is 12-15kg/m<3>; and a grain size of EPS grains is 1-2mm. The damping vibration-isolating compound track bed meets the demands on strength and long-term stability, has certain elasticity, has an obvious damping vibration-isolating function and has the energy attenuation above 50-60dB.

The invention relates to a three-way nonlinear hybrid energy dissipation self-resetting damper. The three-way nonlinear hybrid energy dissipation self-resetting damper comprises a damper cavity body,a particle swarm, a buffer material, viscous liquid, variable stiffness springs and a fixed structure. The damper cavity body is composed of an inner cuboidal cavity and an outer cuboidal cavity. Theinner portion of the inner cuboidal cavity is paved with a layer of particle swarm, and the buffer material is pasted on the inner wall of the inner cuboidal cavity. The outer wall of the inner cuboidal cavity and the inner wall of the outer cuboidal cavity are connected by the variable stiffness springs, and the viscous liquid is arranged between the inner cuboidal cavity and the outer cuboidal cavity in a filling mode. The four variable stiffness springs are uniformly arranged at the bottom of the outer cuboidal cavity and are connected with a basic structure. The bottom of the outer cuboidal cavity is connected with the fixed structure in the horizontal direction through the two variable stiffness springs which are arranged in an orthogonal mode. By reasonably setting the stiffness of the nonlinear variable stiffness springs made from shape memory alloys, the damper can provide different stiffness in the horizontal, orthogonal and vertical directions to tune the frequency of the structure under the action of wind/earthquakes, and the vibration energy of the structure is dissipated through viscous energy-dissipation, spring energy-dissipation, friction and collision of the particle swarm and the like.

A double cavity type piezoelectric micropump comprises a cover body, a shell and a pump core component, wherein the shell is fixedly matched with the cover body, pump cavities are defined by the cover body and the shell, and the pump core component is located in the pump cavity. The cover body is provided with a first locating protrusion and a first pre-pressing portion, and the shell is provided with a second locating protrusion and a second pre-pressing portion; the pump core component comprises a primary support together clamped by the first locating protrusion and the second locating protrusion, a secondary support fixedly matched with the primary support, a first elastic seal ring arranged on the primary support, a second elastic seal ring arranged on the secondary support, a first piezoelectric vibrator the periphery of which is pre-pressed on the first elastic seal ring and abuts against the first pre-pressing portion, a second piezoelectric vibrator the periphery of which is pre-pressed on the second elastic seal ring and abuts against the second pre-pressing portion, a first inlet valve and a first outlet valve arranged on the primary support, and a second inlet valve and a second outlet valve arranged on the secondary support. The double cavity type piezoelectric micropump has the advantages of being large in flow, compact and small in structure, low in noise and extremely high in practical value.

The invention discloses an active and passive integrated vibration isolation device and a vibration isolation platform. The vibration isolation device comprises an elastic plane net structure, an active electromagnetic dynamic vibration absorber, and a piezoelectric stack actuator. The elastic plane net structure is formed by weaving steel wires in a tensioning and crossed manner. The active electromagnetic dynamic vibration absorber is arranged on the intersection of a central region of the elastic plane net structure. The piezoelectric stack actuator is arranged on the edge position of the elastic plane net structure. The vibration isolation platform comprises the vibration isolation device, a bearing cylinder, an intermediate support, and a control system. A satellite attitude control device assembly is arranged on the intermediate support. The intermediate support is installed on the vibration isolation device. The vibration isolation device is installed on the inner side of the bearing cylinder. The control system is used to control the active electromagnetic dynamic vibration absorber according to vibration acceleration information of the intermediate support, and control the piezoelectric stack actuator according to the vibration acceleration information of the bearing cylinder. The vibration isolation device and the vibration isolation platform are effective for low-frequency line spectrum, and have good control effect on broadband random excitation.

In a floor panel structure of a vehicle body in which a floor of an automotive vehicle is formed by a floor panel coupled to a plurality of frame members extending in substantially longitudinal and width directions of the vehicle, there are provided a panel area formed by being enclosed at least by the frame members, a heavy-weight area located at a substantially central portion of the panel area, and a peripheral area located substantially around the heavy-weight area, wherein the heavy-weight area is configured so as to be heavier than the peripheral area. Accordingly, the vibration energy transmitted from the frame members to the floor panel can be reduced and thereby the acoustic emission generated from the floor panel can be reduced.

A vibratory conveying apparatus including: a base; a first conveying body arranged above the base; a vibrating body for vibrating the first conveying body; a first elastic support connected between the first conveying body and one side of the vibrating body; an inertia body which is connected to the other sides of the vibrating body and constitutes a free end of vibration; and a second elastic support connected between the base and the one side of the vibrating body, and the first elastic support, and further including: a second conveying body; and a third elastic support connected between the second conveying body and the one side of the vibrating body, the first elastic support, and the second elastic support.

The invention discloses a bridge deck continuous seam structure which comprises a bridge pier and two plate beams positioned on the top surface of the bridge pier, wherein a beam end seam is formed between the two plate beams and is filled with a buffering block; hot asphalt sticking layers are arranged at the upper ends of the plate beams; rubber cushion layers are further arranged between the hot asphalt sticking layers and the beam end seam; mixed concrete layers, fiber polyester anti-cracking cloth layers and asphalt concrete layers are further arranged on the rubber cushion layers in sequence; bridge deck paving steel bar meshes and continuous seam reinforcement steel bars are arranged in the mixed concrete layers. Furthermore, the invention further discloses a forming method for the bridge deck continuous seam structure. The bridge deck continuous seam structure is formed by the steps of arranging the buffering rubber block in the beam end seam, arranging the rubber cushion layers above the plate beams, pouring the mixed concrete layers for combining the fiber anti-cracking layers and the asphalt concrete layers and the like. The bridge deck continuous seam structure is more reasonable in stress; attenuation of amplitude of the plate beams can be accelerated, and development of cracks is effectively suppressed.

The invention relates to a domestic appliance, such as a steam iron or a coffee making apparatus. Such appliance comprises a housing, a water reservoir, an actuator, for example, plunger pump and a boiler for providing hot water or steam for an appliance. An input of the plunger pump is connected to the water reservoir, an output of the plunger pump is connected to an inlet of the boiler. In operation, the plunger pump is reciprocating at the mains frequency. The operating plunger pumps introduces vibrations which are transmitted to the housing and radiated by the housing to the environment which cause sounds and noise which are not user friendly and environment friendly. In order to reduce the sound induced by these vibrations the domestic appliance is provided with two leaf springs mounted at opposite sides of the actuator for moving the actuator in a direction opposite to a direction of the movement of the drive member.

The invention provides a control method for three-way vibration of an underground floating slab based on magneto-rheological fat vibration isolators. Four semi-active magneto-rheological fat vibration isolators are arranged under the underground floating slab so that vibration energy of the underground floating slab on the vertical direction, rolling and pitching can be restrained. The advantage of being capable of controlling damping of the magneto-rheological fat vibration isolators is fully utilized, and a vertical-rolling-pitching vague vibration isolation control not relaying on a mathematical model and a self-adaptation strategy are adopted. The transmission of the vibration energy of the floating slab to a foundation is reduced respectively on the vertical direction, the horizontal direction and the longitudinal direction within a broadband range. The series defects that a traditional passive vibration isolator can not self-adaptively adjust a damping value along with changes of exciting vibration, and is poor in low frequent vibration isolation effect, and the like are overcome, and the problem of broadband vibration isolation of multi-directional vibration coupling of a rail of the underground floating slab can be solved.

A motor vibration damping device includes several dampers and a connecting part. Each damper is disposed in a fixing hole of a mechanic fixing piece for reducing motor vibration energy transmitted to the mechanic fixing piece and the connecting part connects the dampers.

The invention discloses a bridge pier damping device. The device comprises a base, vertical vibration damping mechanisms, a transverse vibration damping mechanism and a top plate; the vertical vibration damping mechanisms comprise supporting seats, spiral springs arranged between the supporting seats and the base, and magnetorheological fluid dampers arranged in the base and used for applying damping to vibration of the supporting seats in the vertical direction; the transverse vibration damping mechanism comprises ellipsoidal elastic rollers located between the top plate and the supporting seats and magnetorheological fluid rotary dampers used for applying damping to the rotation of the ellipsoidal elastic rollers; and ellipsoidal surfaces matched with the ellipsoidal elastic rollers areformed at the bottom of the top plate and the top surface of the supporting seats. According to the bridge pier damping device, the device can "intelligently" adjust the self-rigidity to change the natural frequency of the structure to resist impact force and large deformation under the impact load by utilizing the magnetorheological fluid damper, and the pier-beam displacement can be inhibited byrelieving the transmission of the shock vibration energy through the adjustment of the damping ratio of the magnetorheological fluid damper at the emergency moment when the bridge is impacted and vibrated.

A case structure includes a first housing and a fan frame fixing module. The fan frame fixing module includes a fan frame, a positioning part and an auxiliary part. The positioning part is disposed on the first housing. The auxiliary part is disposed on the first housing. The fan frame urges against the first housing and the positioning part, and the auxiliary part urges against the fan frame so that the fan frame is fixed on the first housing.

The invention discloses a cooling device for a numerical control fan, and belongs to the technical field of fan cooling. The cooling device comprises a casing. An impeller is arranged inside the casing. An air inlet is formed in the surface, corresponding to the position of the impeller, of the casing. The surface, corresponding to the air inlet, of the casing is detachably connected with a purification device. Through the effective coordination of the designed purification device, spiral tubes, refrigeration fins, coolant and a noise reduction shield, impurities can be prevented from adheringto a bearing box, so as to not only prevent the impurities from increasing the friction between a spindle and a bearing in the bearing box, but also ensure the cooling effect of air flowing in an airchannel on cooling water or lubricating oil flowing in the cooling channel. A motor can be cooled. To a certain extent, the cooling device can reduce the heat generated by the motor during operationand is transmitted to the bearing in the bearing box through the spindle, so that the bearing in the bearing box can be further protected and the stability of the bearing in the bearing box can be ensured.

The panel area is formed in the substantially rectangular shape with sides thereof which extend substantially straight, by being enclosed by the frame member and the vibration restraint portion to control a vibration area, such as beads and the bent line portion, and the high-rigidity area and the low-rigidity area are formed within the panel area. Accordingly, the vibration energy can be increased at the low-rigidity area properly. As a result, the vibration energy transmitted from the frame members to the floor panel can be reduced, and thereby the acoustic emission generated from the floor panel can be reduced.

The invention discloses a four-axis synchronous powerful vibration excitation device used for an automatic block moulding machine. For the device, a case-type vibrating plate is installed on the frame base of a block moulding machanism, a frequency adjustment vibration motor is sequentially connected with a synchromesh gear case, a power transmission shaft and a vibration exciter; the vibration exciter is arranged under the case-type vibrating plate, and the vibration excitation cam of the vibration exciter directly drives the case-type vibrating plate to do periodic powerful vibration; the vibration motor is adjusted by a frequency automatic adjustment program control device to change the rotating speed of a vibration exciter, and adjust and control vibration frequency, vibration amplitude and excitation force; the device better solves the technical problems of four-axis synchronous efficient powerful excitation, stepless adjustment of vibration frequency, vibration amplitude and excitation force, the instantaneous transformation of light vibration and powerful vibration, and the like. The device is mainly used for configuring the automatic block moulding machine to produce concrete block products, and has the advantages of high vibration accelerated speed, large effective covering area of excitation force, short vibration moulding cycle, high product quality performance grade and the like.

The invention discloses a shock absorption foundation structure of a device and a construction method of the shock absorption foundation structure. By means of the shock absorption foundation structure, the shock absorption effect can be improved, and maintenance expenses can be reduced. The shock absorption foundation structure comprises a foundation layer, a filling layer, shock absorbers and a secondary foundation. Shock absorption grooves are formed in the foundation layer. The installation faces of the shock absorbers are arranged on foundation bottom plates of the shock absorption grooves. The filling layer is arranged on the inner walls and the foundation bottom plates of the shock absorption grooves. Shock absorption faces lower than the shock absorbers are filled with the portions, above the foundation bottom plates, of the filling layer. An installation groove is formed by the filling layer. The secondary foundation is arranged in the installation groove and located on the shock absorption faces of the shock absorbers. It is ensured that the construction method includes the following steps that firstly, the foundation layer is poured, and the shock absorbers are arranged on the foundation layer; then, a waterproof layer and the filling layer are sequentially constructed, and a reinforcing steel bar framework can be installed on the filling layer; and then, the secondary foundation is formed through pouring. By means of the shock absorption foundation structure and the construction method of the shock absorption foundation structure, the shock absorption effect of a shock absorption foundation can be improved, and the maintenance cost and the construction cost can be reduced.

The invention discloses a vibration reduction design method for a hub motor driven vehicle. According to the technical scheme, the method comprises the steps of building physical and mathematic models of vibration of the vehicle according to the existing hub motor driven vehicle; building road surface and hub motor electromagnetic force models; through simulative analysis, performing calculation to obtain vibration energy and contribution rate of each key point under road surface and motor excitation; according to an analysis result, proposing a feasible improvement scheme, and through comparative analysis, determining an optimal scheme; obtaining sensitive parameters of vibration energy transmission of the optimal scheme; by taking minimum vibration energy transmitted to a vehicle body as an optimization goal, performing optimization design on the sensitive parameters by adopting a proper optimization algorithm; and through comparative analysis before and after optimization, verifying an optimization result, and obtaining a final design scheme. According to the vibration reduction design method provided by the invention, the vibration transmission characteristic of the hub motor driven vehicle can be effectively improved; the smoothness and riding comfort of the vehicle are improved; and a certain theoretical basis is laid for vibration reduction control of the hub motor driven vehicle.

The invention relates to an air cylinder servo feeding guide device in the field of automatic machining machine tools. The air cylinder servo feeding guide device comprises stand columns which are arranged in parallel, the upper ends of the stand columns are fixedly connected through an upper connecting plate, the lower ends of the stand columns are fixedly connected through a lower connecting plate, adjusting nuts are in threaded connected with the stand columns, guide sleeves are installed at the positions, located on the upper sides of the adjusting nuts, of the stand columns in a sleeved mode, and springs are arranged between the guide sleeves and the lower sides of the adjusting nuts. The guide sleeves are fixedly connected with a floating plate, and a lower idler wheel is installed on the floating plate. An air cylinder is fixed to the upper connecting plate, the axis of the air cylinder is perpendicular to the ground, and the extending end of a piston rod of the air cylinder is connected with an upper idler wheel corresponding to the lower idler wheel. The device can reduce jitter of workpieces and meanwhile guarantee that the workpieces do not deform and is particularly applied to machining thin sheet materials or strips.