422results about How to "Improve vibration damping effect" patented technology

The invention provides a bridge built-in multi-dimensional self-adaptive tuning vibration reduction and monitoring device based on air energy. The bridge built-in multi-dimensional self-adaptive tuning vibration reduction and monitoring device mainly comprises a bridge health monitoring system, an air energy device, a steel plate spring, a belleville spring, an electromagnetic damper, a hydraulic damper, a hydraulic displacement amplification mechanism and an actuator. The bridge health monitoring system is used for monitoring and analyzing the state of a bridge in real time, finding potential structural problems in time and driving the tuning vibration reduction device to respond according to the monitored vibration and temperature conditions to achieve self-adaptive control over bridge vibration, and the air energy device uses the quality characteristic of the air energy device as a mass block of the tuning vibration reduction device to achieve self-adaptive control over bridge vibration. The damping device plays a key role in vibration reduction, can provide temperature and humidity control for stable operation of a bridge and a monitoring system, and is matched with a spring, a damping system, a hydraulic displacement amplifying mechanism and an actuator to effectively control multi-directional complex vibration of the bridge, adjust the temperature difference between the inside and the outside of the bridge and prolong the service life of the bridge.

The invention discloses a high-temperature superconducting electric maglev vehicle multi-mode damping device based on an electromagnetic shunting technology. The high-temperature superconducting electric maglev vehicle multi-mode damping device comprises a coil system and a vehicle suspension frame. Wherein the coil system comprises a vehicle-mounted superconducting magnet, an 8-shaped suspension guide coil and a propulsion coil; the vehicle suspension frame carries a vehicle-mounted superconducting magnet, a low-temperature container, a damping coil and an external circuit module. Accurate design of electromagnetic parameters is achieved through a plurality of branch parallel circuits, dynamic responses of different frequencies can be effectively matched, and multi-mode vibration reduction is achieved in a passive mode. An optimized damping effect can be provided for various vibration modes in a rail system without depending on an active control system, and the vibration reduction performance of the system is remarkably improved. Aiming at different vibration frequencies, adjustment can be carried out by replacing components such as capacitors and inductors in the branches, the structure is simple, and the cost is low.

The invention relates to an easy-to-replace marine single-point vibration reduction base which comprises a panel, the upper end face of the panel is matched with an auxiliary equipment base and provided with bolt holes used for being connected with auxiliary equipment, and a vibration reduction pad is laid between the panel and the auxiliary equipment base; the webs are vertically welded to the two sides of the lower end face of the panel to form a supporting structure of the vibration reduction base unit; wherein the face plate and the web plate are connected in a welded mode to form a vibration reduction base unit together, and the vibration reduction base unit is used for supporting and reducing vibration of auxiliary machine equipment. The damping device is compact and reasonable in structure and convenient to operate, the damping performance, the structural strength and the anti-corrosion capacity are remarkably improved by optimizing the structural design of the base, introducing the self-adaptive adjusting supporting device and the reinforcing rib plates and other innovative designs, and meanwhile installation and maintenance are facilitated. The beneficial effects jointly provide powerful guarantee for stable operation of ship power equipment, vibration and noise transmission are reduced, and comfort and invisibility of a ship are improved.

The invention provides a double-valve shock absorber and a suspension system.The shock absorber comprises a liquid storage barrel and a piston rod, an energy storage device cavity and a working cylinder are arranged in the liquid storage barrel, the interior of the working cylinder is divided into a recovery cavity and a compression cavity through a piston on the piston rod, and a safety valve is arranged on the piston; a bottom valve is arranged on the working cylinder; a rebuilt valve and a compression valve are arranged outside the liquid storage cylinder, the rebuilt valve comprises a first one-way electromagnetic valve and a rebuilt oil cavity, the rebuilt oil cavity is communicated with a rebuilt cavity, the rebuilt oil cavity is communicated with the energy storage device cavity through the first one-way electromagnetic valve, the compression valve comprises a second one-way electromagnetic valve and a compressed oil cavity, and the compressed oil cavity is communicated with the energy storage device cavity. The compressed oil liquid cavity is communicated with the recovery cavity through a second one-way electromagnetic valve, and the recovery oil liquid cavity is communicated with the compressed oil liquid cavity through conveying equipment. Stepless damping adjustment can be achieved, the wheels can be actively lifted, damping can be adjusted in real time according to different driving conditions when a vehicle is applied, the height of a vehicle body is adjustable, and the driving experience is optimized.

The invention relates to the field of electromagnetic vibration damping devices for changing fluid viscosity and adjusting damping properties, in particular to a bidirectional adjustable magneto-rheological inerter damper. The bidirectional adjustable magneto-rheological inerter damper comprises a first terminal (11), a second terminal (12), a first end plate (21) and a second end plate (22), and is characterized by further comprising a screw (3), screw balls (41), channel balls (42), an input ring (51), an output ring (52), a continuously variable transmission (6) and a controllable damping system (7), and the continuously variable transmission (6) comprises a stator (61), an idle wheel (62), a shell (65), traction fluid (66) and the like. And the controllable damping system (7) comprises a fixed pipe (71), a fixed pipe rotor (72), a rotor bearing (73), a flywheel (76), an electromagnetic coil group (77), a controller (78) and a direct-current power supply (79). Space is saved, and the vibration control performance is good.

The invention provides a pile structure positioning device with a local resonance unit and a forming construction method.The pile structure positioning device is arranged at a notch of a digging groove, and the pile structure positioning device comprises a fixing ring, a connecting plate, an adjusting air cylinder, a stress plate and a positioning ring; the fixing ring is arranged in the middle of the top of the reinforcement cage; the outer diameter of the positioning ring is smaller than the inner diameter of the fixing ring; the periphery of the bottom side of the positioning ring is fixedly connected with a plurality of connecting plates vertically extending into the deep position of the digging groove, the outer side wall of each connecting plate is provided with an adjusting air cylinder, and the telescopic end of each adjusting air cylinder is fixedly provided with a stress plate and abuts against the inner wall of the reinforcement cage. Compared with the prior art, the pile structure positioning device designed through the method can ensure the placement precision of the local resonance unit, and the influence of position deviation on the vibration reduction effect is avoided.

The invention discloses a damping device for axial vibration control of a steam-water pipeline of a thermal power plant, the damping device comprises two outer connecting assemblies and two inner fixing assemblies, the two inner fixing assemblies are respectively located in the corresponding outer connecting assemblies, and the inner walls of the two outer connecting assemblies are fixedly connected with a plurality of radial damping assemblies; the invention relates to the technical field of pipeline vibration control. According to the damping device for controlling the axial vibration of the steam-water pipeline of the thermal power plant, the damping device and the steam-water pipeline can be conveniently and fixedly installed through the arranged outer connecting assembly and the inner fixing assembly, and meanwhile the damping effect on the steam-water pipeline can be improved through the arranged axial damping assemblies distributed in a surrounding mode; and meanwhile, through cooperative use of a third spring, a movable buffering damping block, a fourth spring and a fixed vibration reduction damping sleeve in the axial vibration reduction assembly, axial vibration borne by the steam-water pipeline can be buffered and reduced, the shaking amplitude of the steam-water pipeline is reduced, and therefore the working stability of the whole pipeline can be improved.

The invention discloses a vibration reduction device and method for fluid resonance in a deep sea FPSO moon pool, and the method comprises the following steps: 1, evaluating the geometric structure and fluid dynamic characteristics of the deep sea FPSO moon pool, the geometric structure comprises the size and shape of the moon pool, and the fluid dynamic characteristics comprise the flow velocity and direction of fluid in a set time period; calculating the resonant frequency of the fluid in the moon pool based on the geometric structure and the fluid dynamic characteristics by adopting a three-dimensional fluid dynamic simulation technology; and 2, based on the fluid dynamics data sample obtained through evaluation, the layout and configuration scheme of vibration reduction equipment is designed, and the vibration reduction equipment comprises at least three vibration reduction units. By accurately evaluating the geometric structure and fluid dynamic characteristics of the moon pool and adopting proper vibration reduction equipment, fluid resonance in the moon pool can be effectively reduced, so that the structural stability and safety of the FPSO are improved. And the resonance phenomenon is reduced, so that the structural fatigue is prevented, and the service life of the FPSO is prolonged.

The invention discloses an active and passive composite vibration reduction system, and particularly relates to the technical field of vibration reduction equipment, the active and passive composite vibration reduction system comprises a bottom shell, a load platform, a passive vibration reduction device and an active vibration reduction device, and the passive vibration reduction device and the active vibration reduction device are both arranged between the bottom shell and the load platform; the passive damping device comprises a positive stiffness mechanism and a negative stiffness mechanism which are arranged in parallel; the active damping device comprises a controller, a sensor, a piezoelectric actuator and a flat plate type voice coil motor, the sensor is fixed on the load platform, the sensor, the piezoelectric actuator and the flat plate type voice coil motor are all in signal connection with the controller, and the controller processes signals transmitted by the sensor and transmits commands to the piezoelectric actuator and the flat plate type voice coil motor. The method has higher control precision, stronger anti-interference capability and more excellent adaptability and flexibility, the inherent frequency and the formant peak value of the damping device are effectively reduced, the high attenuation of high-frequency vibration is ensured, and broadband vibration attenuation is realized.

The invention discloses a micro-power active shock absorber, and belongs to the technical field related to shock absorption. Comprising a vibration exciter, a signal processor and a sensor. The vibration exciter is arranged on the machine body through a spring in a suspension manner; the machine body is mounted on equipment to be damped; the vibration exciter is a single-degree-of-freedom vibration system; the sensor obtains the vibration frequency, the phase and the amplitude of the vibration-damped equipment; the signal processor acquires a signal of the sensor and controls the vibration exciter to vibrate; the vibration generated by the vibration exciter and the vibration of the vibration-damped equipment are the same in frequency and opposite in phase. According to the micro-power active shock absorber, the micro-power driver is adopted, vibration of the vibration guide block is accurately controlled, a vibration exciter is excited to resonate, large vibration force is generated to counteract vibration of equipment subjected to shock absorption, and therefore the shock absorption effect is achieved.

The present invention provides a vibration suppression system for a photovoltaic bracket and a single-axis photovoltaic bracket. The vibration suppression system includes a constraint protection unit, and the constraint protection unit includes a force transmission component, a vibration displacement amplification component, an eddy current energy dissipation component, and a high wind protection component. The input end of the force transmission component is connected to the two ends of the photovoltaic bracket in the rotation direction; the high wind protection component includes a magnetic conductor arranged on the outside of the transmission shaft, and the magnetic conductor has a magnetic attraction with the transmission shaft when the wind speed reaches the critical wind speed of static wind instability of the bracket. The single-axis photovoltaic bracket includes a photovoltaic panel, a photovoltaic panel rotating beam, and a vibration suppression system. The constraint protection unit of the vibration suppression system is divided into two groups, and the two groups of constraint protection units are respectively arranged at the two ends of the photovoltaic panel along the length direction; the force transmission component of the constraint protection unit is arranged parallel to the torsion surface of the photovoltaic panel, and the transmission shaft is arranged horizontally. The present invention has the advantages of avoiding damage to the bracket during wind vibration and improving the safety and reliability of the bracket.

The invention provides a vibration suppression system of a photovoltaic support and a single-shaft photovoltaic support, the vibration suppression system comprises a constraint protection unit, the constraint protection unit comprises a force transmission assembly, a vibration displacement amplification assembly, an eddy current energy consumption assembly and a strong wind protection assembly, and the input end of the force transmission assembly is connected to the two ends of the photovoltaic support in the rotation direction; the strong wind protection assembly comprises a magnetizer arranged on the outer side of the transmission shaft, and a magnetic attraction force exists between the magnetizer and the transmission shaft when the wind speed reaches the static wind instability critical wind speed of the support. The single-shaft photovoltaic support comprises a photovoltaic panel, a photovoltaic panel rotating beam and a vibration suppression system, the vibration suppression system is provided with two sets of constraint protection units, and the two sets of constraint protection units are arranged at the two ends, in the length direction, of the photovoltaic panel respectively; the force transmission assembly of the constraint protection unit is parallel to the torsion surface of the photovoltaic panel, and the transmission shaft is horizontally arranged. The invention has the advantages of avoiding bracket damage during wind vibration, improving the safety and reliability of the bracket and the like.

The utility model relates to the technical field of breaking accessories, in particular to a breaking hammer damping rod which comprises a breaking hammer and a drill rod connected to the top of the breaking hammer, and a top sliding seat is installed in the drill rod in a sliding mode. The first groove and the second groove are formed in the drill rod, and the reset spring and the steel column are installed in the first groove and the second groove, so that an effective vibration reduction mechanism is formed. When the breaking hammer is impacted, the steel column can slide in the first groove, meanwhile, the reset spring is compressed, impact energy is absorbed through elastic deformation of the spring, and the damping effect is further enhanced through the arrangement of the hard spring. The top sliding seat is wound on the outer wall of the steel column in the second groove, and the top and the bottom of the top sliding seat are fixedly connected with the bottom of the second groove respectively. When the top sliding seat slides in the drill rod, the hard spring deforms, so that more impact energy is absorbed, and vibration transmitted to the breaking hammer is further reduced.

The present application provides a compressor assembly and an air conditioner. The compressor assembly comprises a chassis (1), a compressor body (2), a first vibration reduction structure and a second vibration reduction structure, wherein the first vibration reduction structure is connected between the chassis (1) and the compressor body (2) and provides a vibration reduction force in a radial direction for the compressor body (2), and the second vibration reduction structure is connected between the chassis (1) and the compressor body (2) and provides a vibration reduction force in an axial direction for the compressor body (2). According to the compressor assembly of the present application, the vibration reduction performance of the compressor under unstable working conditions or in a harsh external environment can be improved, thereby ensuring the smooth operation of the compressor.

The invention relates to the technical field of floating slab ballast beds, in particular to a novel floating slab ballast bed shock absorber which comprises a shock absorber body, the shock absorber body comprises an upper cover plate and a cylinder, a telescopic sleeve is fixedly connected between the upper cover plate and the cylinder, and the cylinder is filled with a damping agent. The bottom of the upper cover plate is connected with a U-shaped permanent magnet through a connecting assembly, an electromagnet is fixedly installed at the bottom of the inner wall of the barrel, an adjusting assembly is arranged in the barrel, the bottom of the U-shaped permanent magnet is fixedly connected with a plurality of damping rods, and conical spiral blades are arranged on the outer walls of the damping rods respectively. The electromagnet is used for generating repulsive force on the U-shaped permanent magnet, vibration of the upper cover plate is further reduced, the magnetic field intensity of the upper cover plate is changed by adjusting the current intensity, so that the repulsive force is adjusted, the more downward the threaded blade is, the larger the contact area with the damping agent is, the interaction between the threaded blade and the damping agent is enhanced, and the damping effect is improved. And the absorption efficiency of vibration energy is improved.

The invention discloses a circular saw blade base body provided with a vibration reduction inner cavity and a method, solves the problem that the rigidity of a saw blade is reduced due to the arrangement of a vibration reduction groove of the saw blade in the prior art, and has the beneficial effects of effectively absorbing vibration and improving the rigidity of the saw blade. Comprising a first saw blade body and a second saw blade body, the inner side face of the first saw blade body is connected with the inner side face of the second saw blade body, and a damping groove is formed in the inner side face of at least one of the first saw blade body and the second saw blade body so that a circular saw blade base body can be provided with a damping inner cavity; the depth of the vibration reduction grooves is smaller than the thickness of the first saw blade body or the second saw blade body, and when the first saw blade body and the second saw blade body are provided with the vibration reduction grooves, the shapes of the vibration reduction grooves are the same or different, and the arrangement modes of the vibration reduction grooves are the same or different. The first saw blade body and the second saw blade body are both provided with vibration reduction grooves, and when the first saw blade body and the second saw blade body are in butt joint, the vibration reduction grooves are arranged in a staggered mode.

The fresh air conditioner with the noise reduction function comprises an air conditioner outdoor unit body, a heat dissipation cavity and a refrigeration assembly are arranged in the air conditioner outdoor unit body, a sound absorption layer is fixedly connected to the interior of the heat dissipation cavity, and a plurality of sound absorption holes are evenly formed in the inner side wall of the sound absorption layer; the lower side wall of the air conditioner outdoor unit body is fixedly connected with a plurality of matching sleeves, the upper inner wall of each matching sleeve is fixedly connected with a damper, the output end of each damper is fixedly connected with a supporting leg, and the outer side wall of each supporting leg is fixedly connected with a matching protrusion. A reset spring is fixedly connected to the position, located in the matching sleeve, of the lower side wall of the matching protrusion. The vibration amplitude of the device can be effectively reduced through the reset spring, the damper can absorb vibration energy, the vibration reduction effect of the device can be effectively improved through combination of the reset spring and the damper, and then noise can be prevented from being transmitted to the outside.

The invention relates to a self-adaptive vibration reduction support for a vision measurement system. The vibration reduction support comprises a lower base and an upper supporting plate and is used for placing vision measurement equipment and a filtering device. A loading shock isolation assembly is arranged in the middle of the vibration reduction support, and the three-direction vibration isolation design is achieved through the synergistic effect of the evenly-distributed vertical main spiral springs and the quasi-zero stiffness shock isolation device. According to the shock isolation device, a horizontal rigid supporting base forms transverse constraint on a bistable beam, fastening connection is achieved through screw rod design, and the quasi-zero stiffness characteristic is jointly formed through the horizontal rigid supporting base and a lower auxiliary spiral spring. A special bistable beam elastic structure is designed, so that a bearing effect is provided for upper equipment, and a constant three-way vibration isolation effect can be kept under different frequencies. And the upper digital filtering device is used for further processing high-frequency noise and ensuring the measurement precision and stability of the vision measurement system. According to the self-adaptive vibration reduction support, digital filtering and physical vibration isolation are fused, and a complete set of method for improving the vision measurement precision is achieved.

The utility model discloses a servo motor with a multi-structure vibration damping function, and particularly relates to the technical field of servo motors, the servo motor comprises a servo motor body, a vibration damping protection mechanism is arranged on the outer side of the servo motor body, the vibration damping protection mechanism comprises a protection shell, the protection shell is arranged on the outer side of the servo motor body, and threaded holes are formed in the surfaces of the two sides of the protection shell. And threaded rods are in threaded connection in the threaded holes. According to the utility model, through the arrangement of the vibration reduction protection mechanism, and through various structures and modes of the damping plate, the rubber plate, the polymer buffer pad and air compression, the vibration of the motor is buffered and reduced from different layers and angles, the vibration reduction effect is greatly improved, the influence of vibration on the motor and peripheral equipment can be effectively reduced, and the service life of the motor is prolonged. The motor is clamped and fixed conveniently, the stability of the motor is guaranteed, displacement or instability caused by vibration is reduced, the vibration reduction effect is improved, and normal operation and working precision of the motor are facilitated.

The invention discloses a local resonance type acoustic meta-structure device with a low-frequency vibration reduction characteristic, which comprises an annular foundation frame plate, oscillator mass blocks, a first transition area, a second transition area, a middle cantilever beam and a side cantilever beam, and the middle cantilever beam and the side cantilever beam are connected to the inner wall of the annular foundation frame plate. And each oscillator mass block is connected with the middle cantilever beam through a second transition area and is connected with the side cantilever beam through a first transition area. Based on the local resonance principle, the band gap range can be adjusted by adjusting the geometric parameters of the mass block and the cantilever beam so as to adapt to different external excitation frequencies, the wide-frequency-domain vibration suppression effect can be achieved for low-frequency vibration of the equipment thin-wall plate, and the purpose that the large wavelength is controlled through the small size is achieved. The method is suitable for effectively protecting important equipment against low-frequency out-of-plane vibration under actual engineering constraint conditions such as weight and space, and has wide practical value.

The utility model discloses a vibration reduction platform based on low-frequency limit cooperative control, which belongs to the technical field of vibration reduction platforms and comprises a bottom plate, a top plate, a vibration reduction component, a pressure bearing part and a sliding component. The top plate is connected with the bottom plate through the damping assembly. The vibration reduction assembly comprises a supporting block, a wedge-shaped piece, a movable piece, a movable rod, a fixed plate and a vibration reduction spring A; the four supporting blocks are evenly arranged on one side of the top plate through the pressure bearing pieces. The wedge-shaped piece is connected with one end of the supporting block; the two movable parts are symmetrically arranged on the two sides of the wedge-shaped part. The movable rods are fixedly arranged on the sides, deviating from each other, of the two movable parts; the fixed plate is sleeved on the movable rod; according to the vibration reduction platform based on low-frequency limit cooperative control, vibration force can be dispersed and buffered through the arranged vibration reduction assembly, the vibration frequency can be reduced, low-frequency limit vibration reduction is achieved, cooperative control over the vibration force can be achieved through multiple dispersion and buffering, and the vibration reduction effect is improved. Therefore, the effect of low-frequency limit cooperative control is realized.

The invention provides a mobile semi-active tuned mass damper based on computer vision and monitoring data, which comprises a footbridge main body structure part, a mobile semi-active control part and a computer vision and monitoring data part, and is characterized in that the footbridge main body structure part comprises a bridge deck, a box girder cavity and a guide rail; the movable semi-active control part comprises a rolling trolley, a semi-active tuned mass damper, a temperature controller and a current controller; the computer vision and monitoring data part comprises a camera, an acceleration sensor and a control center computer, the frequency, rigidity and damping force of the semi-active tuned mass damper are adjusted through the control center computer, and the positions of the rolling trolley and the semi-active tuned mass damper are controlled. According to the damper, the vertical frequency, rigidity and damping force of the tuned mass damper can be adjusted in real time, intelligent vibration control over moving random crowds with different densities is achieved, and the better vibration reduction effect is achieved.

The utility model discloses a magnetic suspension tray active vibration damping device which comprises a tray body and a magnetic support, the outer edge of the tray body is outwards provided with a wing edge, and the upper surface and the lower surface of the wing edge are provided with a first magnet and a second magnet respectively. The magnetic support comprises a first magnetism generating unit arranged on the upper portion of the first magnet and a second magnetism generating unit arranged on the lower portion of the second magnet, the device is based on the electromagnetic suspension technology theory, the IMU sensor is arranged, the state of balance, overweight, weightlessness or deviation of the tray can be sensed, and the electromagnetic suspension technology theory is achieved. Meanwhile, the IMU can sense the stress direction and the stress magnitude of the tray and transmit a signal to the MCU, the MCU controls the driver to generate current flowing to the electromagnetic coil, the electromagnetic coil controls the magnetic force generated by the iron core and the magnetic force of the magnet on the tray to form counter-acting force, and therefore the effects of vibration buffering and balancing on the tray are achieved.

The utility model discloses a counterweight device for mounting a lithium battery, which comprises a mounting shell, and counterweight cavities are arranged on two sides of the mounting shell; the counterweight mechanism comprises a plurality of spherical metal particles for counterweight, the spherical metal particles are mounted in the counterweight cavity in a filling manner, a guide pipe is arranged on the side wall of the counterweight cavity in a penetrating manner, a pressing piece is movably mounted in the guide pipe, one end of the pressing piece extends into the counterweight cavity, and the other end of the pressing piece inclines downwards and is hinged to a push plate; the ends, not hinged to the pressing pieces, of the push plates are hinged to a fixing transverse plate, the fixing transverse plate is fixedly connected with a limiting guide shaft downwards, a fixing sleeve is installed at the bottom of the installation shell, and the limiting guide shaft is movably inserted into the fixing sleeve. The periphery of the fixing sleeve is fixedly sleeved with a spiral spring located between the fixing annular plate and the fixing transverse plate of the fixing sleeve. According to the utility model, a sufficient damping effect can be formed on the basis of not influencing the counterweight function, so that the influence of vibration on the operation stability of the battery module is reduced.

The invention discloses a random detuning type track vibration reduction system and a design method thereof.The structure comprises track pieces and vibration reduction units, the track pieces are arranged on a track plate in groups at intervals, the multiple vibration reduction units are arranged on the inner sides and the outer sides of the track pieces or on the track plate, and the multiple vibration reduction units on the same side of the track pieces are distributed corresponding to the longitudinal periodicity of the track pieces; the vibration reduction units on the two sides of the rail piece are symmetrically arranged or arranged in a staggered mode. The main frequency of the vibration reduction unit is close to the band gap frequency of the track structure, the vibration mode of the vibration reduction unit and the vibration mode of the track structure are mutually coupled, so that the resonance structure of the vibration reduction unit and the ballastless track structure generate a coupling effect, the band gap range is enlarged, and the mass, rigidity and installation position parameters of the vibration reduction unit are designed to be randomly distributed. According to the random detuning type design method, the vibration reduction range can be further widened, vibration of the track structure cannot be increased, the vibration reduction unit does not need to be replaced along with service time prolonging or environment changing, and the vibration reduction capacity is effectively improved.

The invention discloses a prefabricated concrete local resonance periodic vibration reduction road plate which comprises a base layer, a panel layer and a local resonance unit array layer, the local resonance unit array layer is arranged between the base layer and the panel layer, and the local resonance unit array layer, the base layer and the panel layer are integrally poured to form the prefabricated road plate. According to the prefabricated road plate formed in the scheme, through the stacked design of the rubber concrete base layer, the local resonance unit array layer and the rubber concrete face plate layer, the engineering vibration attenuation effect can be achieved on the basis that the strength requirement of the road plate is met. And secondly, through the synergistic effect of local resonance elastic wave band gap filtering and rubber concrete damping vibration attenuation, the vibration attenuation performance of the road plate is further enhanced, and the negative effects of vibration on human health and the working environment can be reduced.

The invention belongs to the field of overhead transmission lines of power systems, and relates to a vibration damping spacing device for multiple insulator strings, which comprises a horizontal vibration damping connecting component connected with the insulator strings in the horizontal direction, and the horizontal vibration damping connecting component comprises a connecting plate, a first vibration damping assembly, a second vibration damping assembly and a third vibration damping assembly. The upper portions and the lower portions of the ends, close to each other, of the two connecting plates are movably connected with one end of a first vibration reduction assembly, the other end of the first vibration reduction assembly is movably connected with small triangular plates, a second vibration reduction assembly is movably connected between the two small triangular plates, and the two sides of the second vibration reduction assembly are movably connected with one ends of two third vibration reduction assemblies. And the other end of the third vibration reduction assembly is movably connected with one side of the first vibration reduction assembly, so that a triangular structure is formed among the three vibration reduction assemblies. According to the invention, the absorption efficiency of vibration energy is high, and the vibration reduction effect is better especially for large-amplitude vibration and swing between multiple insulator strings.

The invention relates to a multi-mode cooperative damping vibration attenuation method for a large-span bridge girder. The multi-mode cooperative damping vibration attenuation method comprises the following steps that the type and corresponding structural characteristics of the large-span bridge girder are determined; determining a target vibration reduction design requirement according to the girder type, wherein the target vibration reduction design requirement comprises a frequency range of vortex-induced vibration under different wind attack angles, a damping ratio minimum value corresponding to each order of frequency under a vertical modal shape, and a damping ratio minimum value corresponding to each order of frequency under a torsional modal shape; and determining a cooperative control scheme of the tower beam damper and the tuned mass damper mounted on the large-span bridge on the multi-modal vibration of the main beam according to the target vibration reduction design requirement. According to the multi-mode cooperative damping vibration attenuation method for the large-span bridge main beam, the tower beam damper and the tuned mass damper are installed on the large-span bridge main beam at the same time to be used in a combined mode so as to complete cooperative vibration attenuation design, and the purposes of improving the vibration attenuation effect and achieving full coverage of multi-mode vibration frequency are achieved. The problem of vortex-induced vibration reduction of the large-span bridge girder is solved.

The invention relates to the field of ocean engineering, and discloses a multi-layer pore plate structure for shock absorption of an ultra-large floating body, the structure is composed of a plurality of pore plates which are horizontally arranged, and the pore plates are rigidly connected with the floating body through fixing devices and are made of high-strength light materials; open pores are uniformly distributed in the surface of each pore plate, and the porosity, the plate spacing, the water entry depth and the plate layer number of the pore plates can be flexibly adjusted according to the working environment and the wave condition of the floating body; the porosity range is 6%-15%, the distance between the plates is 4.2%-16.7% of the working water depth of the floating body, and the water entering depth is 1-3 times of the height of the wave below the bottom surface of the floating body; through reasonable design and arrangement, the multiple layers of porous plates can effectively reduce transmission and reflection of wave energy, the energy dissipation capacity is enhanced, and vibration reduction of the head wave side and dynamic stability of the back wave side are achieved; the damping device has the characteristics of flexible structural design, remarkable damping effect and wide application range, and is suitable for offshore and deep sea ultra-large floating body engineering.

The invention relates to an electromagnetic energy harvesting type nonlinear variable damping shock absorber and a control method thereof. The electromagnetic energy harvesting type nonlinear variable damping shock absorber comprises a box body (1), a spring-mass damping mechanism (2) and an electromagnetic energy harvesting mechanism (3). The spring-mass damping mechanism (2) comprises a mass block (21) arranged on the guide rail (22) in a sliding mode, a nonlinear spring (23) arranged perpendicular to the movement direction of the mass block (21) and a linear spring (24) arranged parallel to the movement direction of the mass block (21). The electromagnetic energy harvesting mechanism (3) comprises a permanent magnet (31) and a coil (32) used for generating current when the permanent magnet (31) rotates. And a transmission mechanism (4) capable of converting translation of the mass block (21) into rotation of the permanent magnet (31) is arranged between the spring-mass damping mechanism (1) and the electromagnetic energy harvesting mechanism (2). Compared with the prior art, by controlling the resistance value change of the variable resistor (52), the balance between the vibration reduction performance and the energy harvesting efficiency of the system can be realized.