247results about How to "Achieve vibration reduction" patented technology

The invention provides a sound insulation module on the sound insulation device of large-noise equipment, which is widely applied to the noise disposal of large-noise equipment in the industries such as power, petrochemicals, metallurgy and the like. The module, from external layer to internal layer, sequentially comprises a sound insulation plate, a damping vibration layer and a sound-absorbing wool plate; from internal layer to external layer, the module sequentially comprises a porous sound-absorbing steel plate and a sound-absorbing wool plate; the circumference of the module is provided with reinforcing plates vertical to the porous sound-absorbing steel plate and the sound insulation plate; the sound insulation module is characterized in that a layer of sound insulation wool felt and a rectangular sound refluxing chamber are arranged between two sound-absorbing wool plates uniformly and intermittently. The sound insulation module prolongs the staying time of the sound in the sound refluxing chamber, enlarges the contact area between the noise and the wool plate and the wool felt, converts more sound energy into the heat energy inside the wool plate and the wool felt and improves the sound-absorbing coefficient of the material; the sound insulation quantity reaches more than 40dB, which is higher than the similar product by 15-35%.

The invention discloses an electromagnetism and magnetorheological fluid mixed shock absorber which can realize active control, is low in energy consumption and can recover energy. The electromagnetism and magnetorheological fluid mixed shock absorber comprises an upper shell and a lower shell which are connected together; an intermediate connecting plate is arranged at the connecting part of the two shells; a piston rod penetrates into the two shells and is connected with a piston body after penetrating through the intermediate connecting plate; the upper shell and the piston body are internally provided with an electromagnetic device respectively; the two electromagnetic devices are both connected with a control unit, and the control unit is connected with a signal end of a sensor; the lower shell at the lower part of the piston body is internally provided with a moving piston; a magnetorheological fluid cavity is respectively arranged between the piston shell of the piston body and the intermediate connecting plate and between the piston shell of the piston body and the moving piston, and the two magnetorheological fluid cavities are communicated by a communicating structure of the piston body; and a nitrogen cavity is arranged between the moving piston and the lower shell. The electromagnetism and magnetorheological fluid mixed shock absorber combines the advantages and disadvantages of the magnetorheological fluid semi-active control and the magnetism active control of the shock absorber, and has the advantages of being good in shock absorbing effect, low in energy consumption and recoverable in energy.

The invention relates to the field of wind power generation, and particularly discloses a wind power generation device. The device comprises a generator and a square tank, the lower portion of the generator is located in the square tank, a vertical shock absorber is arranged between the bottom plate of the square tank and the bottom surface of the shell of the generator, and transverse shock absorbers are arranged between the four side plates of the square tank and the side surfaces of the shell of the generator; the vertical shock absorber comprises a first shock absorbing mechanism and second shock absorbing mechanisms, wherein the first shock absorbing mechanism comprises an outer sleeve cylinder, a base assembly and a fixing assembly; the second shock absorbing mechanisms comprise twoelastic shock absorbing plates symmetrically fixed to the shell of the generator and pouring bags arranged between the elastic shock absorbing plates and the bottom plate of the square tank, and the transverse shock absorbers comprise outer cylinders fixed to the side plates of the square tank and inner cylinders slidably arranged in the outer cylinders in a sleeved mode. By means of the wind power generation device, shock absorbing and noise reduction can be effectively conducted on the generator, occurrence of resonance between the generator and external environment is prevented, smooth andstable operation of the generation device is ensured, the noise produced by the generator during work is reduced, and the noise pollution is reduced.

The invention provides a method for reducing the self-excited vibration of a deep-hole processing boring bar, a vibration damper designed by utilizing the method for selecting parameters of the vibration damper has the advantages of simple structure and convenient detachment and can modify the parameters of the vibration damper of a power vibration damping boring cutter according to the needs at any time, the vibration damper consists of a vibration damping rod, damping fluid and rubber rings, and the vibration damper can effectively suppress the vibration during the processing. The method is realized through the following technical scheme: (1) establishing a theoretical model of a power vibration damping boring bar; (2) establishing a simulation model on the basis of the theoretical model and selecting the parameters of the vibration damper; (3) selecting finite element analysis software ANSYS and multi-body dynamics simulation software ADAMS for jointly establishing a dynamics simulation model of a vibration damping system and constituting a rigid-flexible coupling model; (4) designing a physical vibration damping boring bar model according to the models; and (5) selecting the vibration damping rod; and using the vibration damping rod with sheathed rubber rings at two ends and a boring bar inner hole for constituting the vibration damper, wherein the boring bar inner hole is arranged deep at one end and sealed by a plug, and the damping fluid is filled in the inner cavity of the boring bar inner hole.

The invention provides a liquid engine propellant flow field calibration system and method. The calibration result can be more precise and rapid, and high-precision measurement of the flow in an engine test is achieved. The conventional large liquid engine propellant flow field calibration system comprises a mass flow meter which is connected to a main pipeline in series and located between a propellant main vessel and a turbo flow meter, a pressure adjustment system and a propellant recycling pipeline are configured, and it is guaranteed that when the position and state of the turbo flow meter are consistent with those of test run, on the basis of the mass flow, a real propellant is adopted for conducting field calibration on the turbo flow meter; a propellant recycling pipeline is connected with the main pipeline in series and finally connected to a propellant recycling vessel, and the propellant recycling vessel is used for storing the propellant flowing in the exhaust process and the calibration process.

The invention discloses a method for reducing the vibration and the noise of a permanent-magnet motor, comprising the following steps of: (1) initially selecting a magnetic pole number and a tooth socket number according to application occasions; (2) judging the stress and vibration states of the permanent-magnet motor, wherein the permanent-magnet motor generates torque pulsation if a phase tuning factor ks=0 is solved according to a formula: ks=mod (lsNs / Nm) and km=0 is solved according to a formula: km=mod (lsNm / Ns), the permanent-magnet motor generates unbalanced magnetic pull if the phase tuning factor ks=1 or Nm-1 and km=1 or Ns-1, and the permanent-magnet motor is in a stress balance state if ks=2, 3, 4 to Nm-2 and km=2, 3, 4 to Ns-2; and (3) repeating calculation formulas of the corresponding stress and vibration states in the step (2) to select the sum of the magnetic pole number and the tooth socket number. The method can be used for selecting different parameters aiming at different occasions according to the mapping relation between the magnetic pole number and the tooth socket number of the permanent-magnet motor and the vibration and noise characteristics of the permanent-magnet motor, thereby realizing the vibration reduction and / or the noise reduction of the permanent-magnet motor.

The invention relates to an intelligent vibration isolation device for a precision machine tool. At present, no intelligent vibration isolation device which is reasonable in structural design and is remarkable in vibration damping effect is available for the precision machine tool. The intelligent vibration isolation device is characterized by comprising a detection unit, a control unit and an executing unit, wherein the detection unit is used for detecting the vibration direction, frequency and amplitude of external vibration through a PVDF (Polyvinylidene Fluoride) piezoelectric slice, converting the external vibration into an electric signal through a signal processing system, and correcting and amplifying the electric signal to provide an executing parameter; the control unit is used for receiving the signal from the detection unit, working out data which is opposite to the external vibration in phase but identical in amplitude, and converting the data into an electric signal; the executing unit is used for receiving the electric signal from the control unit, converting the electric signal into a motion signal by using an inverse piezoelectric effect and counteracting and weakening the external vibration through self deformation for realizing vibration damping and vibration isolating functions; and the executing unit, the control unit and the detection unit are sequentially connected. The intelligent vibration isolation device is reasonable in structure design, remarkable in vibration damping effect, and reliable in performance.

The invention relates to an integrated AGV driving and lifting mechanism. The integrated AGV driving and lifting mechanism comprises a driving installing plate (1), a speed reducer A (4), a chain drive device, vibration dampers, a lifting device, two drive shafts (8) and drive wheels (5). The speed reducer A (4) is installed on the driving installing plate (1), the two drive shafts (8) are installed on the lower side of the driving installing plate (1), the two drive wheels (5) are installed on the ends of the outer sides of the two drive shafts (8) respectively, the ends of the inner sides of the two drive shafts (8) are rotationally installed on the lower side of the drive installing plate (1), the vibration dampers are arranged between the two drive shafts (8) and the drive installing plate (1) respectively, and the lifting device is vertically installed in the middle of the drive installing plate (1). The integrated AGV driving and lifting mechanism has the advantages of being good in damping effect, high in vehicle body strength and high in road grabbing capacity and has the automatic resetting function.

The invention discloses a bogie traction device and an application thereof. A traction device is mounted on a bogie and comprises a central pin, a central pin seat, a central pin sleeve seat and a first and second traction pull rod assembly. The upper end of the central pin is pressed in a mounting hole of the central pin seat through interference fit; the upper part of the central pin seat is connected with a vehicle body; and the central pin sleeve seat is arranged at the lower end of the central pin in a sleeving manner. One end of the first and second traction pull rod assembly is connected to the side part of the central pin sleeve seat; and the other end of the first and second traction pull rod assembly is connected to a cross beam of a bogie framework. The central pin sleeve seat is connected with the bogie framework through the first and second traction pull rod assembly; and the first and second traction pull rod assembly is used for stably transmitting a traction force and abraking force. According to the bogie traction device, technical problems that an existing bogie traction device cannot adapt to an electric transmission subway track engineering vehicle use environment, the structure of the existing bogie traction device is complicated, and the existing bogie traction device cannot satisfy requirements of vehicle speed and minimum curve radius can be solved.

The invention relates to a foot wheel type auto-kinetic movement platform based on a parallel-connection six-freedom-degree movement mechanism and belongs to the technical field of robots. The foot wheel type auto-kinetic movement platform comprises a control system, an energy system and a platform mechanism. The platform mechanism is the trunk of the whole auto-kinetic movement platform and comprises a carrier of the platform and a driving mechanism. The driving mechanism is of a foot wheel combined structure, a main body of the driving mechanism is the six-freedom-degree parallel-connection movement mechanism, wheels are installed on the movable end face of the six-freedom-degree parallel-connection movement mechanism so as to form the foot wheel combined driving mechanism. The driving mechanism is installed under the carrier of the platform, the control system and the energy system are installed under the carrier of the platform, and the carrier of the platform can further bear other load. The driving mechanism is used for completing walking drive of the movement platform and is the parallel-connection six-freedom-degree movement mechanism with the wheels. The foot wheel type auto-kinetic movement platform has the advantages of high movement speed of a wheel type movement platform and good passing ability of a foot type movement platform and can be used in occasions including field investigation, material transportation in a severe environment and the like.

The invention relates to an AGV drive independent suspension vibration reduction mechanism which comprises a drive mounting plate (1), a gear motor (4), a chain transmission device, damping devices, driving shafts (8) and driving wheels (5). The gear motor (4) is mounted on the drive mounting plate (1). The number of the driving shafts (8) is two, and the driving shafts (8) are mounted on the lower side of the drive mounting plate (1). The two driving wheels (5) are mounted at the ends of the outer sides of the two driving shafts (8) respectively, the ends of the inner sides of the two driving shafts (8) are mounted on the lower side of the drive mounting plate (1) in a rotating mode, and the damping devices are arranged between the two driving shafts (8) and the drive mounting plate (1) respectively. Each damping device comprises a sleeve (10), a sliding block (15), a spring (14), an end cover (13) and a vibration reduction mounting plate (12). The AGV drive independent suspension vibration reduction mechanism has the advantages of being good in vibration reduction effect, high in vehicle body strength and high in road grabbing capacity.

The invention relates to a changeable stepped damping thrust bearing. The thrust bearing is mainly composed of a pressing head (1), a thrust disc (2), a plurality of movable bush assemblies, a plurality of fixed bushes (4) and a supporting ring (5), wherein the pressing head (1), the thrust disc (2), the movable bush assemblies, the fixed bushes (4) and the supporting ring (5) are arranged from top to bottom. The thrust disc (2) is connected with a rotary shaft of the bearing through the pressing head (1), and the thrust disc (2), the rotary shaft of the bearing and the pressing head are coaxially and fixedly connected. Each movable bush assembly and the corresponding fixed bush (4) are attached together to form a stepped variable-height bearing bush assembly. The multiple bearing bush assemblies are arranged on the supporting ring (5) in the circumferential direction to share the total load in the axial direction. The movable bush assemblies of the bearing bush assemblies are mounted in front of the fixed bushes (4) when seen from the rotating direction of the thrust disc (2). The changeable stepped damping thrust bearing can be used for designing of bearings which often work under variable working conditions, allow inclination of thrust discs and have high requirements for the bearing capacity and the damping performance of naval ships and the like.

The invention discloses a device for absorbing vibration through nonlinear energy transfer and collision energy consumption, which comprises an absorber body, wherein the absorber body comprises a connection support fixedly connected with a structure member to be subjected to vibration absorption, a box body is fixedly arranged on the connection support, a mass block is arranged in the box body, two ends of the mass block are respectively provided with a nonlinear spring I and a nonlinear spring II, one end of the nonlinear spring I and the nonlinear spring II are fixedly connected with the mass block, the other end of the nonlinear spring I and the nonlinear spring II are fixedly connected the inner wall of the box body; a collision adjusting device I is arranged at the upper part of thebox body, a collision adjusting device II is arranged at the lower part of the box body, the low end of the collision adjusting device I and the upper end of the collision adjusting device II penetrate through the box body, the collision adjusting device I and the collision adjusting device II have gaps with the mass block, and a gap is also arranged between the collision adjusting device II and the structure member to be subjected to vibration absorption. The invention has the advantages of rational structure design, convenience for use and good vibration absorbing effect, low use cost and wide application range.

The invention relates to a particle damping rubber vibration isolator of an engine. According to the technical scheme, the upper end face and the lower end face of vibration isolation rubber (3) are in vulcanizing bonding with a corresponding upper connecting plate (2) and a corresponding lower connecting plate (4), a lower connecting bolt (5) is fixed onto the lower plane of the lower connecting plate (4), an upper connecting bolt (1) is fixed onto the upper plane of the upper connecting plate (2) and a damping rod (7) is fixed onto the lower plane of the upper connecting plate (2). The upper connecting bolt (1), the upper connecting plate (2), the vibration isolation rubber (3), the lower connecting plate (4), the lower connecting bolt (5) and the damping rod (7) are coaxially connected. The vibration isolation rubber (3) is a hollow cylinder, the hollow part of the hollow cylinder forms a closed damping cavity (8) with the upper connecting plate (2) and the lower connecting plate (4), particle damping materials (6) are placed in the damping cavity (8) and the particle damping materials (6) occupy 50-85% of the volume of the damping cavity (8). The particle damping rubber vibration isolator of the engine is simple and reliable in structure, convenient to manufacture and low in cost, has the dynamic characteristics of low-frequency high dynamic stiffness and large damping and also has the dynamic characteristics of high-frequency low dynamic stiffness and small damping.

The invention relates to a housing for a galvanic element, preferably a lithium-ion cell, wherein the housing consists of a carbon fibre-reinforced plastic (CFK) provided with a moisture-impermeable layer. In addition, a galvanic element, a rechargeable battery and a motor vehicle are disclosed.

The invention discloses a tuned electromagnetic inertial mass damper, which mainly comprises a ball screw mechanism arranged in an outer barrel. The upper end of the ball screw mechanism is connectedwith a gearbox and a rotary flywheel, and the gearbox is fixed by an upper limit device; the tuned electromagnetic inertial mass damper further comprises an inner barrel arranged at the lower end of the interior of the outer barrel, a lower limit device is arranged on the outer part of the inner barrel, and the inner tube can linearly move up and down in the lower limit device; the upper end of the inner barrel is fixedly connected with the ball screw mechanism to drive the ball screw mechanism to linearly move up and down; and a coil and a permanent magnet are arranged in sequence from the outer side to the inner side of the lower part inside the inner barrel, the permanent magnet is internally and fixedly connected with a magnetic conductor capable of linearly moving up and down, the magnetic conductor extends to the outer sides of the lower ends of the inner barrel and the outer barrel, the lower end of the magnetic conductor body is fixedly connected with the lower part connectionpart and a connection plate of the lower part connection part, and a spring and the connecting plate are fixedly connected with the lower end partof the inner barrel and are mounted outside the magnetic conductor in a sleeving mode. The tuned electromagnetic inertial mass damper is suitable for civil engineering structures with relative displacement, such as stay cable, long span bridge beam and tower beam connection positions, and displacement positions among high-rise buildings.

The invention relates to a vehicle, a magnetorheological fluid type vehicle shock absorbing seat control device and a magnetorheological fluid type vehicle shock absorbing seat control method. The magnetorheological fluid type vehicle shock absorbing seat control device comprises a seat body, a damping assembly, an elastic sealing connection component, a box body, an acceleration sensor and an ECU, wherein the damping assembly comprises a damping plate which is fixedly connected to the bottom part of the seat body in a perpendicular manner, and a damping hole penetrating the damping plate; a magnetorheological fluid is internally packaged in the box body, and the box body is in sealing connection with the damping assembly by means of the elastic sealing connection component; the damping assembly suspends in the magnetorheological fluid and can be kept in a state of separation from the inner surface of the box body; the acceleration sensor is used for acquiring seat acceleration information and transmitting the seat acceleration information to the ECU; and the ECU is used for receiving the seat acceleration information acquired by the acceleration sensor, and calculating a current control quantity applied to the magnetorheological fluid according to the seat acceleration information, so as to control damping characteristics of the magnetorheological fluid flowing through the damping hole. The magnetorheological fluid type vehicle shock absorbing seat control device can realize the shock absorption of the seat body, and is conductive to enhancing the comfort of a passenger sitting on the seat.

The invention discloses a connecting rod type vibration absorption platform which comprises a base, a pillar and vibration absorption mechanisms. A mounting hole is formed in the base. One end of the pillar is arranged in the mounting hole through a spring. A damper bushing is arranged between a part of the circumferential wall of the pillar and a part of the inner wall of the base. Each vibration absorption mechanism comprises a first connecting rod, a second connecting rod, a sliding block and a weight block. One end of the first connecting rod is hinged to the base. One end of the second connecting rod is hinged to the pillar. A strip groove is formed in a part of the rod wall of the second connecting rod. The sliding block is spaced in the strip groove through a spring, and is hinged to the other end of the first connecting rod. One end of the second connecting rod is hinged to the pillar, and the other end of the second connecting rod is hinged to the middle of the first connecting rod. The weight block is suspended at the other end of the second connecting rod through a spring. Vibration energy, generated by a power source, is transferred between the connecting rods and is converted for many times, so that the vibration energy is converted into various forms of energy to be consumed, and the vibration attenuation effect is achieved.

The invention discloses a wind generating set tower load reduction method based on control strategy optimization. The method comprises the steps: optimizing an existing tower resistance increasing strategy, taking measured forward and backward acceleration of a tower as input, obtaining the tower resistance increasing compensation amount through a tower resistance increasing controller of a wind generating set, then determining and outputting the tower resistance increasing compensation rate or angle in a variable-pitch controller of the wind generating set according to the running state of the unit, and adjusting the blade pitch angle by a variable-pitch system of the wind generating set according to a variable-pitch instruction sent by the variable-pitch controller, so that thrust on thetower is changed, effective damping of the tower is increased, then the purposes of vibration reduction and fatigue reduction of the tower are achieved, the limitation and defect that the existing tower resistance increasing strategy only plays a role in rated and above working conditions are overcome, tower vibration is further reduced, tower fatigue loads are reduced, the unit safety is improved, and the whole machine cost is reduced.

The invention relates to an inertial resistance type vibration absorber. The inertial resistance type vibration absorber comprises a sealed body, a piston mass block, two springs and an antifriction sealing device, the sealing body is a sealed cavity composed of an upper wall, a lower wall and a side wall, the upper surface and the lower surface of the piston mass block are of a symmetrical downward concave structure, axial damping holes are processed at the bottom of the downward concave structure, the piston mass block is hermetically connected with the side wall of the sealed body via the antifriction sealing device, the center of each of the upper side and the lower side of the piston mass block is connected with one spring, the other ends of the two springs are connected with the upper wall and the lower wall respectively, the two springs support the piston mass block in the middle of the sealed body, the piston mass block divides the sealed body into an upper cavity and a lower cavity, the damping holes of the piston mass block penetrate through the upper cavity and the lower cavity, and the liquid level forms an air chamber between the upper cavity and the upper wall after oil liquid fully fills the lower cavity. The inertial resistance type vibration absorber is capable of converting main vibration energy of equipment subjected to vibration reduction into kinetic energy of an inertial element of the inertial resistance type vibration absorber, and utilizes a self damping system to achieve substantial vibration reduction of the equipment and a system.

The invention discloses a vibration isolator in a floating slab track system and a method for determining operating parameters of the vibration isolator. The vibration isolator is disposed between a floating slab of the floating slab track system and a track foundation, and comprises parallel steel springs, damping fluid and controllable Coulomb damping elements. The method comprises the steps: in the case of not considering Coulomb damp, establishing a vehicle-floating slab track coupling dynamics time-domain analysis model, taking maximum vertical vibrating displacement of a floating slab and a steel rail as a control index, determining a minimum supporting rigidity Ka of the floating slab without considering the Coulomb damp, then determining a displacement threshold value of floating slab by combining a floating slab vertical vibration displacement time travel curve characteristic under the minimum supporting rigidity working condition without considering the Coulomb damp, determining the magnitude of a Coulomb damping force and an operating time period, and finally calculating the minimum supporting rigidity Kb with the Coulomb damp by utilizing a vehicle-controllable Coulomb damp vibration isolator floating slab track coupling dynamic time-domain analysis model. The vibration isolation efficiency of the traditional steel spring floating slab track can be effectively improved.

The invention discloses a parallel and adjustable-frequency negative-stiffness vibration absorbing device. The device comprises an upper bearing plate, secondary structures and a base, wherein the secondary structures are two distributed rectangular rings, namely, an inner rectangular ring and an outer rectangular ring; each rectangular ring comprises four secondary structures; each secondary structure comprises a negative-stiffness unit, a positive-stiffness unit and a common damping component; the negative-stiffness units comprise inner magnets, outer magnets and conducting rods; the positive-stiffness units comprise upper mechanical springs, upper connectors, lower mechanical springs and lower connectors; and the common damping components are uniformly distributed on an outer annular frame. According to the device, the stiffness of the upper mechanical springs of the secondary structures of the inner rectangular ring and the outer rectangular ring, and the damping coefficients of the common damping components are set to achieve the vibration absorbing effect of each frequency point within a low frequency brand, and thus the purpose of performing adjustable-frequency vibration absorbing on specific frequency vibration of an instrument within the low frequency brand can be achieved.

The invention discloses a self-induction magneto-rheological damping pipe clamp, which comprises a fixed top cover, a vertical pipe clamp, a damping rubber sleeve, a micro energy conversion unit and a fixed bottom plate. The rubber cavity of the damping rubber sleeve is filled with a magnetic rheological fluid material. The micro energy conversion unit arranges the metal coil in the damping rubber sleeve, and is wound on the outside of the magneto-rheological fluid material. Two ends of the coil are electrically connected with the MEMS vibrating electromagnetic micro power device, and when the pipeline vibrates, the MEMS vibrating electromagnetic micro power device absorbs the vibration energy of the pipeline and converts it into electric energy so as to generate a magnetic field after the coil is energized, and the magnetic rheological fluid material is cured under the action of the magnetic field, and the curing degree increases with the strength of the magnetic field, thereby changing the rigidity of the damping rubber sleeve, increasing the clamping degree to the pipeline, and finally reducing the vibration of the pipeline. In this invention, the vibration absorption vibration of the pipeline can be realized, the rigidity and clamping degree of the pipe clamp can be regulated according to the vibration degree of the pipeline, and the absorption and reuse of the vibration energy can be realized.

The invention relates to a deep hole machine tool, in particular to a cutter bar vibration reducing supporter for the deep hole machine tool, and in particular, discloses a vibration reducing supporter of a deep hole machining cutter bar. The invention solves the problems of complex structure, no reasonability and weak vibration reducing effect in a traditional vibration reducing supporter of deep hole machining cutter bar. The vibration reducing support consists of left and right two parts, wherein the left part comprises a front bearing base, a belt wheel connecting shaft, a large synchronous belt wheel, a thread shaft, a pressure sleeve, a thrust bearing positioning sleeve and a thrust ball bearing; the right part comprises a back bearing base, an inner taper sleeve, a taper block, a taper block and a damping block uniformly distributed with axial wedge gaps, a spring base, a spring and a return ring; and axles of the front bearing base, the belt wheel connecting shaft, the thread shaft, the thrust bearing positioning sleeve, the pressure sleeve, the large synchronous belt wheel, the back bearing base, the inner taper sleeve, the taper block, the damping block, the return spring and the spring base are all positioned on one straight line. The vibration reducing supporter can fully realize the support and the vibration reduction of the deep hole machining cutter bar, is prominent in vibration reducing effect, and greatly improves the machining quality of deep hole parts.

The invention discloses an active and passive vibration reduction device based on piezoelectric ceramics and a six-degree-of-freedom vibration reduction system, and belongs to the technical field of mechanical dynamics. The active and passive vibration reduction device comprises a load connector, active and passive vibration reduction mechanisms, a middle mass block, a speed sensor, a piezoelectric ceramic actuator, a displacement amplification mechanism, a foundation platform and a controller; one end of the passive vibration reduction mechanism is connected with the load connector, and the other end of the passive vibration reduction mechanism is connected with the middle mass block; the lower part of the middle mass block is connected with the displacement amplification mechanism; the speed sensor collects the movement speed of the middle mass block and feeds back a speed signal to the controller, and the controller calculates a voltage signal applied to the piezoelectric ceramic actuator according to the speed signal so as to enable the piezoelectric ceramic actuator to generate deformation displacement in the horizontal direction; and the displacement amplification mechanism converts the horizontal displacement into vertical displacement and drives the middle mass block to realize vibration reduction. According to the active and passive vibration reduction device, an active control system and a passive vibration reduction system are combined, so that the device can effectively restrain low-frequency resonance and isolate low-frequency vibration and has a good high-frequency vibration reduction effect.

The invention relates to a high-thrust driving vibration isolation device. The high-thrust driving vibration isolation device comprises a top plate and a bottom plate. The top plate and the bottom plate are connected through guide pillars and guide sleeves, and the guide pillars are inserted into the guide sleeves. U-shaped baffles are installed on the portions, close to the edges, of the upper surface of the bottom plate, openings of the U-shaped baffles are upward, and magnets are fixedly installed on the inner sides of the U-shaped baffles. Wire winding steel plates which extend downwards are fixedly installed on the lower surface of the top plate, stretch into the U-shaped baffles, and are connected with a power source. The high-thrust driving vibration isolation device is designed according to the linear motor principle, a Halbach type permanent magnet matrix is adopted by the magnets, energized coils generate upward thrust under the action of the high-intensity magnetic field to partially counteract the downward gravity, and therefore vibration reduction is achieved, and the vibration reducing effect of the high-thrust driving vibration isolation device is remarkable; compared with an electromagnetic facility with the size equal to that of the high-thrust driving vibration isolation device, the high-thrust driving vibration isolation device has the advantage that the output force of the high-thrust driving vibration isolation device can be increased by 2-5 times; and due to the fact that a vibration amplitude adjusting device is adopted, the amplitude of vibration reduction can be adjusted according to different environments, and the application range of the high-thrust driving vibration isolation device is greatly broadened.

A drilling tool includes a drill body having chip channel formed therein and carrying cutting inserts at front ends of respective chip channels. Disposed in the chip channels at a location spaced from the cutting insert are respective damping elements. Each damping element comprises first and second portions formed of respective materials of different rigidity.

The invention discloses a piezoelectric composite material helicopter blade structure and a control method thereof. A piezoelectric composite material is embedded into a composite material lamination structure of a rotor blade. An analysis model is established and is capable of accurately describing the motion rule of the rotor blade based on a structure model, an aerodynamic force model, a piezoelectric composite material model and the like, and further accurately calculates the dynamics characteristics of the rotor blade. According to the control method, a controller is employed for controlling the rotor blade, a Kalman observer is employed for obtaining rotor blade data under the condition of white noise interference, and the rotor blade data is taken as input variable for controlling, and further by using the controller to control the input voltage of the piezoelectric composite material, the purpose of controlling blade dynamics response and deformation is finally realized. The provided model establishing method and the control method have relatively high versatility and accuracy, help to accurately obtain dynamics characteristics of the helicopter rotor blade, and are high in control efficiency.