74results about How to "Effective vibration isolation" patented technology

The invention discloses an active vibration isolation control platform. The active vibration isolation control platform comprises an active vibration isolation device and an active vibration isolation controller; the active vibration isolation device comprises a lower platform, a midbody and an upper platform; a voice coil motor actuator is arranged between the midbody and the lower platform; a linear variable differential transformer type displacement sensor is arranged between the upper platform and the midbody; and two three-freedom-degree acceleration sensors are arranged on the upper platform and the lower platform respectively. The vibration isolation controller is designed according to a master-slave open type control structure and consists of an upper control computer and a lower execution controller, wherein the upper control computer is a mainframe of an embedded type industrial control computer PC/104; and the lower execution controller is an open-type controller. The active vibration isolation control platform is quite effective on low-frequency vibration isolation and is applicable to precise manufacture, precise measurement, aerospace application and other vibration isolation fields with special requirement on vibration environment.

The invention relates to a large-span steel connecting bridge and an integral hoisting method thereof. One end of a steel connecting bridge is connected with an original building through a high-strength bolt, and the other end is connected with a new building through a lead core rubber support saddle; an integral hoisting method is adopted for the hoisting of the steel connecting bridge, before a caterpillar crane enters a main hoisting position, a truck crane is used for raising the steel connecting bridge so as to move the steel connecting bridge to the installation position, and until the steel center stays in the main hoisting range of the caterpillar crane, the steel connecting bridge is integrally hoisted to the place through the caterpillar crane. Through a shock-isolation support saddle and a damper, the large-span steel connecting bridge can be arranged between the original building and the new building when the installation position is not previously reserved, the difficulties such as the restriction of the construction field, the restriction of the underground structural complexity and the restriction of the narrow integral hoisting space structure and the like can be overcome during the hoisting process, the normal use of the original building is ensured, and the construction period is shortened. The method can be widely applicable to the construction of the connecting bridge which is established on the present building.

The invention provides a novel high-precision hybrid vibration isolation device. The novel high-precision hybrid vibration isolation device comprises an assembly plate, an intermediate separation plate, a bottom plate, an air spring and magnetorheological dampers, wherein the assembly plate and the intermediate separation plate are connected through the magnetorheological dampers; the intermediate separation plate is fixedly connected with the air spring through bolts; and the bottom plate is fixedly connected with the air spring. The magnetorheological dampers are used for isolating low-frequency vibration signals coming from the ground; and since practical ground signal sources can be transferred along multi-dimensional directions, the four magnetorheological dampers have vibration isolation capability of six DOF (Degree of Freedom) directions. The air spring and the magnetorheological dampers are reasonably connected with the intermediate separation plate, so that high-precision active and passive hybrid vibration isolation capability can be realized. According to the novel high-precision hybrid vibration isolation device disclosed by the invention, a stackable structure is adopted, so that the structure is compact; the vibration isolation capability of multi-DOF can be realized, so that the novel high-precision hybrid vibration isolation device has the advantages of high practicability, high reliability and the like; and an advanced vibration isolation means is provided for a high-precision equipment platform.

The invention provides a passenger car engine suspension device. The passenger car engine suspension device comprises a pair of front suspension structures and a pair of rear suspension structures. The front suspension structures and the rear suspension structures are symmetrically arranged on a left frame longitudinal beam and a right frame longitudinal beam. Each front suspension structure comprises a front suspension support, a front suspension cushion and a front bracket, wherein the front suspension support is used for being connected with an engine, the front bracket is used for being connected with the corresponding frame longitudinal beam, and the front suspension cushion is used for being connected with the front suspension support and the front bracket. Each rear suspension structure comprises a rear suspension support, a rear suspension cushion and a rear bracket, wherein the rear suspension support is used for being connected with the engine, the rear bracket is used for being connected with the corresponding frame longitudinal beam, and the rear cushion is used for being connected with the rear suspension support and the rear bracket. The included angle between each front suspension cushion and the plane where the left frame longitudinal beam and the right frame longitudinal beam are located ranges from 40 degrees to 50 degrees, and the included angle between each rear suspension cushion and the plane where the left frame longitudinal beam and the right frame longitudinal beam are located ranges from 40 degrees to 50 degrees. According to the passenger car engine suspension device, the front suspension structures and the rear suspension structures are both of an obliquely supporting structure, vibration isolation in multiple directions can be achieved, and vibration between the engine and a chassis can be effectively isolated.

The invention provides a sonic toothbrush vibration structure for effectively reducing vibration of a handle. The sonic toothbrush vibration structure comprises the handle and a micro motor capable of generating vibration output, wherein a transmission rod which is formed by overall molding and transmits vibration to a toothbrush head body is arranged on the handle; the micro motor is fixed in an inner cavity of the upper part of the transmission rod; the transmission rod is in a flexible connection with the handle by a first damping rib long in axial direction and short in horizontal direction; a bracket is fixed in the handle; the lower part of the micro motor is connected with a support rod; the support rod is in the flexible connection with a second damping rib; the transmission rod and the support rod are driven by the micro motor to generate relative vibration with the handle; and high-frequency vibration generated by the transmission rod and the support rod is isolated with the handle by the first damping rib and the second damping rib. The sonic toothbrush vibration structure has the advantages of simple structure, reasonable design, convenience in carrying, stable and reliable working performance, relatively wide application scope, and the like and is an ideal tooth-cleaning and tooth-protecting appliance.

The invention discloses a magnetic bearing vibration isolation and impact resistance control method and system. The magnetic bearing vibration isolation and impact resistance control method and systemare applied to a magnetic bearing system. The method comprises the following steps of S1, designing a force-displacement nonlinear dynamic characteristic curve with high static and low dynamic characteristics according to different vibration and impact load working conditions; S2, setting a gain link function expression fp (e) in a high static and low dynamic control algorithm according to coefficients in the force-displacement nonlinear dynamic characteristic curve; S3, setting a differential link function expression fd (e) in the high static and low dynamic control algorithm according to damping ratio requirements of engineering applications; and S4, programming the set high static and low dynamic control algorithm into a controller of the magnetic bearing system to form a high static and low dynamic controller. According to the method and system, the active controllability of the magnetic bearing is utilized, and the control algorithm is used for realizing the condition that the magnetic bearing has high static and low dynamic nonlinear dynamic characteristics, namely, high static bearing capacity and low dynamic rigidity.

The invention relates to a spaceflight liquid engine test device, particularly to integrated equipment and method for thrust measurement and in-situ calibration of an attitude control engine, and aimsto solve the problems that a measuring force sensor of an existing attitude control engine bears large initial torque, fatigue cracks are prone to being generated, and influences of external factorssuch as heat radiation, vibration and the like on thrust measuring precision are large. According to the technical scheme, the integrated equipment comprises a thrust measurement device, a calibrationforce loading device, a data acquisition system and a data processing system, wherein the thrust measurement device comprises a center shaft, an elastic sheet, a connecting frame, a fixed frame, a measurement force sensor and an adapter frame, and the calibration force loading device is arranged on one side of the center shaft and comprises a calibration frame, a lead screw loading mechanism, a standard force sensor and a steel wire. The invention further provides an attitude control engine thrust measurement and in-situ calibration method.

The invention relates to a handheld electric tool and belongs to the technical field of electric tools. The lower part of a casing of the tool extends to form a handle comprising two handle casings, and two correspondingly combined connecting casings are arranged at the bottom of the handle; a connecting seat formed by combining an upper seat body and a lower seat body is mounted in the two handle casings, one of the upper and lower seat bodies is a rigid component provided with a through hole, the other one of the upper and lower seat bodies is an elastic component embedded in the through hole, and horizontal through holes are formed in the rigid component and the elastic component respectively; a horizontal hinge pin penetrating through the horizontal through hole of one of the rigid component and the elastic component extends from the inside of one of the two correspondingly combined handle casings, and the horizontal hinge pin is fixedly connected with the other one of the two correspondingly combined handle casings after corresponding combination; a horizontal hinge pin penetrating through the horizontal through hole of the other one of the rigid component and the elastic component extends from the inside of one of the two correspondingly combined connecting casings, and the horizontal hinge pin is fixedly connected with the other one of the two correspondingly combined connecting casings after corresponding combination. The handheld electric tool can effectively isolate vibration, and all parts of the electric tool cannot loosen and fall when impacted accidentally, so that safety and reliability are guaranteed.

The invention relates to a grouping-cascade-type permanent magnet coupling . The coupling is mainly formed by a permanent magnet disc and a conductor disc. The conductor disc is formed by different quantities of conductor disc assemblies and is installed on a motor shaft. The permanent magnet disc is formed by different quantities of permanent magnet disc assemblies and is installed on a load shaft. The permanent magnet disc and the permanent magnet disc are not contacted and realize a magnetic force coupling transmission torque through opposite rotation. Different assembly quantities can form the permanent magnet couplings with different power. The plurality of assemblies make eddy current loss points disperse so that a purpose of high-efficient heat dissipation is reached.

The invention provides a self-driven rotation shaft vibration and local position stabilization system, which comprises a space vibration stabilization device. The space vibration stabilization device comprises a load disc, a repulsion drive electromagnetic device, a transfer entity, a permanent magnet isolation disc and a transfer shell, wherein the transfer entity matched with the transfer shell is arranged on the load disc; the repulsion drive electromagnetic device arranged on the load disc and the permanent magnet isolation disc arranged on the transfer shell interact mutually to form a repulsion magnetic circuit; when the repulsion drive electromagnetic device does not work, the load disc is separably supported on the transfer shell via the transfer entity; and when the repulsion drive electromagnetic device works, repulsion generated by the repulsion drive electromagnetic device relative to the permanent magnet isolation disc drives the transfer entity to be away from the transfer shell so as to drive the load disc to be separated from supporting of the transfer shell. The system can carry out response driving control on space displacement and space vibration effectively, and a target vibration isolator can be kept stable.

The invention particularly discloses an installation support capable of rapidly and manually adjusting rigidity and damping and a rigidity adjusting method. The installation support comprises a datum plate, a fixing plate and a rigidity adjusting mechanism, wherein the datum plate and the fixing plate are vertically parallel and concentrically arranged, and the rigidity adjusting mechanism is supported between the datum plate and the fixing plate. The rigid adjusting mechanism comprises a plurality of spring assemblies distributed layer by layer from the edge of the fixing plate to the center, and each spring assembly comprises more than three guide bolts evenly distributed around the center of the fixing plate and compression springs arranged on the guide bolts in a sleeving mode. During use, the guide bolt is adjusted to change the distance between the datum plate and the fixing plate, and then the compression amount of the compression spring is adjusted. The mounting support is simple in structure, low in cost and high in reliability; and effective vibration isolation can be carried out on low-frequency noise, and a corresponding anti-swing control system can be better served.

A portable sprayer having a backpack to which are secured a blower unit and a supply tank. The blower unit includes a drive motor and a blower driven thereby. The blower unit is mounted on the backpack by at least one anti-vibration element. The supply tank, for example for spray agent, is mechanically separated from the blower unit and is also mounted on the backpack by at least one anti-vibration element. A removable, at least approximately rigid connection element is provided for coupling the supply tank and the blower unit together or for isolating them from one another with respect to vibrations.

The invention discloses a compressor mounting structure and a refrigerator. The compressor mounting structure comprises a compressor and a bottom plate, wherein the compressor comprises mounting rods;connection structures are arranged on the bottom plate; the compressor mounting structure comprises elastic parts which are fixedly sleeved on the tail ends of the mounting rods; the elastic parts are fixedly connected with the connection structures so as to enable the bottom plate to support the compressor. According to the compressor mounting structure, the elastic parts are capable of effectively isolating vibration in all the directions, for example, effectively isolating vibration in an X direction, a Y direction and a Z direction; the sound insulation noise reduction effects are greatlyimproved.

The invention discloses a method for actively isolating angular vibration of an optical system of a full-strapdown seeker, and relates to the field of vibration isolation technologies for optical systems of full-strapdown seekers. The method has the advantages that the optical system is connected with a guided missile body by a spherical hinge, the mass center of the optical system is coincided with the center of the spherical hinge by the aid of a design, and accordingly the coupled angular vibration is prevented from being led into structural linear vibration; a Sky-Hook damping model is constructed, so that angular vibration response and angular vibration excitation are integrated into the classic Sky-Hook model, and proper spring stiffness and a proper damping value can be selected according to the requirement of the system on a vibration isolation effect; the angular vibration isolation can be actively controlled, so that the guided missile body is excited by the angular vibration, the angular vibration response of the optical system is good in attitude reproducibility in a maneuvering frequency band of a guided missile, and the vibration can be effectively isolated in a noise and vibration frequency band.

The invention discloses a composite support plate device between a double-layer hull board with high-silence-low-motion stiffness. The composite support plate device between the double-layer hull board with high-silence-low-motion stiffness comprises a pressure cylinder between the double-layer hull board, an outer side support plate, an inner side support plate and an adhesive elastic damping material, wherein a piston panel is arranged in the pressure cylinder, and the piston panel is in gap coordination with the inner wall of the pressure cylinder; the upper part of the outer side support plate is fixedly connected to a light surrounding shell, and the lower part of the outer side support plate extends into the pressure cylinder and is fixedly connected to the piston panel; the lower part of the inner side plate is fixedly connected to a pressure resistant hull, and the upper part of the inner side plate is fixedly connected to the bottom of the pressure cylinder; the adhesive elastic damping material is sealed in the pressure cylinder, and the upper surface and the lower surface of the adhesive elastic damping material are vulcanized with board pieces in contact with the upper surface and the lower surface of the adhesive elastic damping material into an entirety. According to the composite support plate device between the double-layer hull board with high-silence-low-motion stiffness, the working stiffness is low when in normal load, the limiting stiffness is high when big load and big deformation occur, the structure is simple, the use and the maintenance are convenient, and the damping effect is remarkable. The invention further discloses a modeling method of the composite support plate device between the double-layer hull board with high-silence-low-motion stiffness.

The invention relates to an unmanned aerial vehicle and a vibration damper thereof. The vibration damper is used for connecting a fuselage of the unmanned aerial vehicle with an inertial measurement unit and comprises a corrugated pipe body, a first extension part and a second extension part, wherein the first extension part is arranged at the end part of the corrugated pipe body and is used for being connected with the fuselage; and the second extension part is arranged at the end part, far away from the first extension part, on the corrugated pipe body and is used for being connected with the inertial measurement unit. Effective vibration isolation can be simultaneously realized when vibration in three directions passes through the vibration damper, so that the measurement accuracy of the inertial measurement unit can be ensured, and the problem of poor measurement accuracy of the inertial measurement unit is solved; and during design, the inherent frequency corresponding to the translational vibration mode in three directions of the fuselage can be adjusted by changing the size, shape, wall thickness and other parameters of the corrugated pipe body.