73results about How to "Reduce vertical vibration" patented technology

A method and a device allow for reducing the vibration generated on the structure 17 of a helicopter 2 by the air flow through the main rotor 5 and by the air flow along the fuselage 3. The device 1 includes: at least one sensor 18, 19, 20 measuring the vibration generated on the structure 17; and computer element 30 responsive to the measurements to determine a variation in angle of incidence for a stabilizer 39 of the helicopter 2 that is suitable for generating a vertical opposing force {right arrow over (TZ)} for opposing the vertical vibration, with the variation in angle of incidence as determined in this way being transmitted to a system 10 for controlling the angle of incidence of the stabilizer 39.

The invention discloses a parameter optimization method of an in-wheel vibration reduction system of electric wheels. The method includes the following steps: step 1, establishing a linear three-degree-of-freedom vibration model of 1/4 of a vibration-damping-type electric-wheel vehicle with the in-wheel vibration reduction system, and a linear two-degree-of-freedom vibration model of 1/4 of an original electric-wheel vehicle without the in-wheel vibration reduction system; step 2, establishing objective evaluation functions; and step 3, establishing constraint conditions, and finding an optimal objective function. According to the parameter optimization method of the in-wheel vibration reduction system of the electric wheels of the invention, time-domain and frequency-domain cooperative-optimization can be carried out, matching of vibration-reduction-spring stiffness and damper damping coefficients can be optimized, thus impacts of road surface excitation on wheel hub motors and vertical vibration of vehicle wheels and a vehicle body can be reduced, and vehicle ride performance and safety can be improved.

The invention provides a built-in metal vibrator vibration and noise reduction dynamic vibration absorber structure of a steel rail. The structure is arranged on the two sides of a steel rail web between two adjacent fasteners and comprises coating body protecting layers, elastic damping bodies and metal mass bodies. Each elastic damping body is tightly attached and fixed to the steel rail and comprises a first elastic damping body and a second elastic damping body which are stacked and fixed into a whole, wherein the hardness of each first elastic damping body is larger than that of each second elastic damping body. Each metal mass body is made of multiple wriggling wavy metal plates which are nested in the corresponding elastic damping body at intervals. Each coating body protecting layer covers the exposed face of the corresponding elastic damping body. By the adoption of the structure, on the premise that the requirement for the sufficient strength of a damping material is met, thedamping effective working area is increased in a wriggling mode, the vibration transmission attenuation rate is increased, the damping material has two different degrees of hardness so as to meet thevibration reduction requirements in different frequency ranges, rail traffic operation noise can be effectively reduced from the position of a noise source, and utilization of the structure does notaffect maintenance of rail traffic original infrastructures and rails.

The invention discloses an unmanned vehicle comfort control method integrating vehicle speed planning and preview of a semi-active suspension. The method comprises the following steps of 1, processingthe preview road surface information; 2, designing a preview semi-active suspension controller; 3, carrying out vehicle speed planning for guaranteeing comfort; and 4, coordinating the suspension with the vehicle speed. According to the method, by utilizing the road information from a network system and a forward-looking sensor, a comfort control strategy for coordinating the vehicle speed and the semi-active suspension is provided, and the multi-target performance of 1) restraining vertical vibration of the vehicle, 2) shortening driving time and 3) reducing longitudinal acceleration and deceleration of the vehicle, can be achieved.

The invention relates to the field of offshore wind power generation, in particular to a novel energy drawing-shock absorbing deep sea wind power generating floating type semi-submersible platform. The novel energy drawing-shock absorbing deep sea wind power generating floating type semi-submersible platform comprises a draught fan blade, a draught fan, a tower barrel and a semi-submersible platform body; the semi-submersible platform body comprises three floating barrels and a triangular floating box; and a wave energy drawing-shock absorbing system is installed in the floating barrels and comprises a power generator, an inertia container, a return spring and a plurality of bearing springs. According to the semi-submersible platform, according to the sea condition or the actual requirement, by adjusting the load power of the power generator and the hydraulic oil flowing speed of the inertia container, influences on normal running of an upper draught fan by the vertical swinging, transverse rocking and longitudinal rocking freedom degree wave frequency response caused by wave loads and the problems of fatigue damage and the like are inhibited, and meanwhile, wave energy is converted into electric energy; and the energy drawing-shock absorbing system serves as a passive control system and fully utilizes the platform stand column space, the shock absorbing performance of the system is reliable, meanwhile, wind power generating and wave energy power generating are integrated, and the whole system has good economical efficiency.

The invention provides an LNG liquid storage tank shock insulation layer which is adaptive to high pile foundation shock insulation on the lower portion of an LND liquid storage tank where cold gas needs to be removed by dispersing in a ventilation mode. The LNG liquid storage tank shock insulation layer comprises a plurality of reaction walls, a plurality of sliding supports, a plurality of lamination rubber supports and a plurality of sticking dampers. The sliding supports are fixedly connected with the lower bottom face of a bottom plate of a tank body of the liquid storage tank and the top face of a pile foundation respectively. The lamination rubber supports are fixedly connected with the lower bottom face of the bottom plate of the tank body and the top faces of the reaction walls respectively. The two ends of each sticking damper are hinged to the lower surface of the bottom plate of the tank body and the stand face of the corresponding reaction wall through ball hinged supports respectively. The LNG liquid storage tank shock insulation layer can be well adaptive to horizontal displacement and vertical vibration of the liquid storage tank caused by an earthquake, the earthquake response of the tank body and the pulse pressure, the convection effect and the waggling wave height of storage liquid can be greatly lowered, accordingly, the influence on the final shock insulation effect from changing of liquid storage amount in the liquid storage tank can be lowered, and a future earthquake with the uncertain earthquake magnitude can be well resisted.

The invention relates to a method of preserving and packaging cherry in controlled atmosphere, including the steps of picking cherry, transporting at low temperature, grading and sorting, washing primarily, chilling, washing and sterilizing, packaging in controlled atmosphere, sterilizing by ultraviolet, and storing. The method belongs to the technical field of cherry preserving and packaging process and cold chain transportation; by subjecting the fresh cherry to chilling, low-oxygen gas controlled-atmosphere packaging, secondary sterilizing and low-temperature high-humidity storage, cold damage index of the cherry is decreased, microorganism control is under control, breath strength of the cherry is reduced, pulp hardness and fruit sourness are maintained, shelf life is prolonged, and fresh taste can be maintained; the method is nontoxic, harmless and free of residue, the whole preserving process employs harmless treatment, the operation method is simple and easy, and the method is a modern cherry preserving and packaging process that can maintain high cherry quality and effectively prolong the shelf time.

The invention discloses a novel parking AGV trolley. The novel parking AGV trolley consists of a bumper, a frame and two sets of symmetrical structures installed on the frame, wherein each set of structures comprises a driving system, a steering system, a vibration attenuation guiding mechanism and a clamping mechanism. The driving system is driven by four electric wheels, all-wheel omni-directional walking can be realized, the effect of bearing a balance car body is reached, and the driving system has relatively high dynamic property; the steering system realizes flexible steering through a swivel bearing and a stepping motor; the vibration attenuation guiding mechanism mainly consists of a spring and a guide rod, and the stability in the transportation process of the trolley is improved;the clamping mechanism comprises a clamping assembly and a clamping adjusting device, the clamping assembly realizes lifting of vehicles, the clamping adjusting mechanism realizes adjustment for thecenter distance of a front clamping device and a rear clamping device, and transportation for vehicles with different distances between shafts can be realized. Compared with the prior art, the novel parking AGV trolley has the advantages of power reliability, steering flexibility, stability in the transportation process and high applicability.

Disclosed is an earthquake sensing alarm system installed to a ceiling finish panel or inner wall of a building. The system includes a sensor unit measuring ground vibration data, a measurement controller controlling the sensor unit, a signal amplifier amplifying the ground vibration data, a high frequency filtering unit removing a high frequency component from the amplified data, an A/D converter converting the filtered ground vibration data into digital data, a microprocessor classifying the digital data according to earthquake stages and controlling an external speaker to issue auditory alarms for behavior and evacuation guidelines, a response correction switch setting measurement sensitivity in each earthquake stage by adjusting sensitivity for the ground vibration data to reflect building characteristics and an installation location, an LED display lighting LEDs according to the stages, an I/O port connected to a central disaster monitoring device in the building, a power supply, and an electric charger.

The invention discloses a computer hardware fixing device. The computer hardware fixing device comprises a fixing base, a groove is formed in the lower end face of the fixing base, and a supporting plate is arranged above the fixing base. The computer hardware fixing device is ingenious in structural arrangement and reasonable in layout, a computer hardware body is placed in a mounting box, a temperature sensor is used for measuring the temperature inside the mounting box, and when the temperature of the mounting box reaches a certain value, a motor is electrified to efficiently cool the interior of the mounting box; meanwhile, the supporting plate at the bottom of the mounting box is supported on the fixing base through compression springs, and vertical vibration is effectively reduced; besides, through vertical sleeves and telescopic rods in telescopic springs, the supporting rigidity of the compression springs is effectively guaranteed, the stability of the supporting plate is improved, besides, the left side of the mounting box is fixed to a lateral plate through connecting springs, horizontal vibration can be effectively alleviated, and when the mounting box needs to be dismantled, the mounting box is conveniently dismantled vertically through pulleys at the bottom and a sliding plate arranged at the right end of the supporting plate.

The invention discloses a design method of an adaptive inversion controller in a flexible active suspension system. The method comprises the following steps of: 1, establishing an active suspension model; and 2, designing an adaptive inversion controller based on a neural network; and aiming at a two-degree-of-freedom flexible active suspension system with unknown nonlinear dynamics, in the control design of the automobile active suspension system, selecting a BL function to construct a control condition meeting system stability, and meanwhile, introducing a second-order auxiliary system to realize asymmetric control saturation compensation. Through the method, the adaptive inversion controller based on the neural network is designed and obtained; and hardware loop experiments show that compared with traditional PD and LQR control, the control method can better attenuate vertical vibration of sprung mass in the automobile active suspension system under sine and impact excitation in thecontrol design of the automobile active suspension system, and meanwhile grounding performance of the automobile active suspension system is improved.

The invention relates to a three-dimensional swing ball type tuned mass damper. A buffer material blocks a transfer path of a vertical vibration load between a bracket and a precise device, a swinging ball spatially moves in a spherical groove of a rubber base for absorbing horizontal vibration energy of the bracket, the rubber base made of a high-damping material is collided so that three-dimensional kinetic energy of the swinging ball can be buffered and dissipated, the radiuses of the spherical groove and the swinging ball of the rubber base are designed according to the vibration frequency of the bracket so that the purpose of resonance is achieved, the vertical vibration of the bracket can be effectively reduced, the planar vibration can also be remarkably decreased, ad thus the spatial vibration of the precise device on the bracket is remarkably reduced, and the normal working of the precise device is kept. The whole three-dimensional swing ball type tuned mass damper has the advantages f good stability and durability, long service life, simple and compact structure, convenience for processing, manufacturing and installing, and high adaptability, and can be widely applied to vibration damping of various precise instrument devices arranged on the light bracket.

An elevator has a car traveling along guide rails within a hoistway and a main drive propelling the car. A sensor mounted on the car measures a vertical travel parameter of the car, a comparator compares the sensed car travel parameter with a reference value derived from the main drive, and an auxiliary motor mounted on the car exerts a vertical force on at least one of the guide rails in response to an error signal output from the comparator.

The invention provides a damping seat and a roller washing machine, belongs to the technical field of roller washing machines, and aims to solve the vibration and movement problems of an outer barrel.The damping seat comprises a bottom frame and a supporting frame; the bottom frame is fixed in a box body of the roller washing machine, the supporting frame is used for bearing the outer barrel, andfirst dampers and pressure springs are symmetrically arranged on the left side and the right side of the bottom frame in the axial direction of the outer barrel and are used for providing vertical support for the supporting frame; second dampers are arranged on the left side and the right side between the bottom frame and the supporting frame in a staggered manner, one ends of the second dampersare connected to the bottom frame, and the other ends of the second dampers are connected to the supporting frame; and the supporting frame is provided with at least one fastening belt, one ends of the fastening belts are connected to one side of the supporting frame, the other ends of the fastening belts are connected to the other side of the supporting frame, and the fastening belts are tightlyattached to the outer wall of the outer barrel. The damping seat and the roller washing machine provided by the invention can reduce the risk of collision between the outer barrel and the box body, thereby improving the operation safety and reducing the noise.

The invention discloses a magneto-rheological damping suspension and a measurement and control method thereof, and relates to the technical field of electric vehicles. The magneto-rheological dampingsuspension comprises a frame for connection, wherein hub motor tires are arranged on two sides of the frame and connected with the frame through magneto-rheological damping shock absorbers. The magneto-rheological damping shock absorbers are arranged, damping provided by the magneto-rheological damping shock absorbers is adjusted in real time through an electronic control unit, the damping changerequirements under various vehicle driving conditions can be met, a vehicle is prevented from bearing strong vibration impact in the driving process, and the comfort of passengers is improved; the magneto-rheological damping shock absorbers are connected with a stator bracket, large transverse force can be borne while vertical vibration of a vehicle body is reduced, and the structure is more compact. The hub motors are adopted to drive the vehicle, electric energy required for controlling the magneto-rheological damping shock absorbers and electric energy for driving the hub motors can be provided by the same vehicle-mounted power supply, an energy supply structure does not need to be additionally arranged, the weight of the vehicle body is reduced, and then energy consumption is reduced.

The invention discloses a plate-strip rolling mill roll system vibration inhibiting system and method based on hydraulic cylinder control. An acceleration sensor (1) is arranged at the bottom of a hydraulic cylinder rigid body (3). A temperature sensor (2) is arranged on a side of the hydraulic cylinder rigid body (3). The hydraulic cylinder rigid body (3) is connected with a temperature adjuster (4). The temperature adjuster (4) is connected with a comprehensive control device (5). According to the invention, related technique for roller vertical vibration inhibition is realized through performing control over oil temperature of a hydraulic cylinder of a rolling mill screwdown gear and a rolling vibration inhibition closed-loop system combining hydraulic cylinder oil temperature and roll system vibration parameters are proposed based on theoretical study and field practice, help is provided for solving rolling mill vertical vibration problems. The system is simple in structure and can realize a rolling mill roll system vibration inhibiting device achieving mutual feedback adjustment of vibration and temperature conveniently and quickly.

The invention discloses a vertical vibration isolation device. The vertical vibration isolation device mainly comprises an upper connecting plate, an adaptive stiffness unit, slidable oblique rectangular compression spring units and a lower connecting plate. The adaptive stiffness unit is mainly composed of a positioning loading ring, a belleville spring and a pre-compressed rectangular spring, wherein the positioning loading ring and the belleville spring work in parallel to provide vertical negative stiffness, the pre-compressed rectangular spring provides vertical positive stiffness, and the positioning loading ring, the belleville spring and the pre-compressed rectangular spring work together to generate adaptive stiffness; and the slidable oblique rectangular compression spring unitsare each composed of a directional linear guide rail, an oblique rectangular compression spring and a universal joint, vertical sliding blocks move down along the directional linear guide rails to cause axial compression deformation of the oblique rectangular springs, and energy is dissipated through the mutual conversion of elastic potential energy and kinetic energy. The adaptive stiffness unitand the slidable oblique rectangular compression spring units work in parallel, collaboratively deform and jointly achieve vertical vibration isolation. The vertical vibration isolation device can bewidely applied to buildings or large and medium-sized mechanical equipment with high requirements for vibration reduction and near rail transit.

The invention relates to a shock absorption counterweight system for a bridge and a working method thereof. The shock absorption counterweight system comprises a plurality of concave counterweight bases fixed to a box girder bottom plate of the bridge in the bridge direction and the transverse bridge direction, wherein counterweight structures are mounted on the counterweight bases, the counterweight structures comprise cubic counterweight blocks and a plurality of concave counterweight blocks distributed from top to bottom, the counterweight bases and the concave counterweight blocks are allprovided with grooves, the upper counterweight blocks are placed in the grooves of the counterweight blocks below the upper counterweight blocks, buffer pieces are arranged on the side walls of the grooves, elastic elements are arranged between the bottommost concave counterweight blocks and the counterweight bases, elastic elements are arranged between the adjacent concave counterweight blocks, and elastic elements are arranged between the upmost cubic counterweight blocks and concave counterweight blocks below the upmost cubic counterweight blocks. The shock absorption counterweight system has simple structure and convenient construction, and effectively reduces the seismic requirements of a bridge structure.

The invention discloses a base shock insulation and three-dimensional shock absorption structure of a double containment vessel nuclear power plant, the base shock insulation and three-dimensional shock absorption structure comprises an inner containment vessel, an outer containment vessel, a core support structure, a core structure, a horizontal shock insulation support, a displacement steering device, a vertical shock insulation support and a vertical damper, wherein the outer containment vessel is fixedly connected with the ground. The inner containment vessel is connected with the foundation through the horizontal shock insulation support. The bearing member of the core structure is connected with the bottom plate of the inner containment vessel through the vertical shock insulation support. The bearing member of the core structure is connected with the side wall of the inner containment vessel through the vertical damper. The inner containment vessel is connected with the outer containment vessel through the displacement steering device. A three-dimensional shock absorption effect is generated by the comprehensive action of the horizontal shock insulation support, the displacement steering device, the vertical shock insulation support and the vertical damper, so the the special seismic safety requirements of the nuclear power plant can be met, and the seismic safety of thenuclear power plant structure is obviously improved.

The invention belongs to the field of vibration control, and particularly relates to a damper vibration reduction system for restraining vertical vibration of a bridge girder. The damper vibration reduction system comprises a bridge pier tower and the bridge girder, and further comprises a torsional damper connected to the bridge pier tower, the torsional damper is connected with a rotating shaftfor driving the torsional damper to output damping force, a first connecting rod is connected to the rotating shaft, the rotating shaft and the first connecting rod can rotate together, a second connecting rod is hinged to the end, away from the rotating shaft, of the first connecting rod, the second connecting rod is hinged to the bridge girder, and the first connecting rod is longitudinally arranged along the bridge girder. The damper vibration reduction system for restraining the vertical vibration of the bridge girder can be used for controlling the vertical vortex vibration of a stiffening girder of a suspension bridge, and can adapt to longitudinal deformation and torsional motion of the stiffening girder.

The invention discloses a vertical vibration reduction support. The vertical vibration reduction support comprises an upper support plate and a lower support plate, and a bearing part capable of achieving vibration attenuation and energy dissipation and a damping system used for vibration attenuation and energy dissipation are arranged between the upper support plate and the lower support plate. The vertical vibration reduction support has the remarkable effect that when elastic deformation occurs, the rubber spring damping system and the elastic pad are used for dissipating energy or reducingvertical vibration of the structure at the same time. Due to the design of the bearing part, the device can bear vertical bearing force, and vertical vibration of the structure can be reduced. The device is simple and reliable in structure, clear in force transmission and stress, low in manufacturing cost and convenient to construct and install.

The invention discloses a bidirectional-waterstop and vibration-damping elastic water seal device of a down-the-hole planar gate. The bidirectional-waterstop and vibration-damping elastic water seal device comprises structural steel, spring steel, a P-shaped water seal and waterstop rubber. The structural steel is fixedly arranged in a gate body. The spring steel is fixedly arranged on the inner side of the structural steel and fixedly connected with the structural steel through bolts. The waterstop rubber is arranged at one end of the structural steel. A backing plate is arranged on the outer side of the waterstop rubber and on one side of a gate groove. The P-shaped water seal is further arranged between the gate body and the gate groove. The bidirectional-waterstop and vibration-damping elastic water seal device of the down-the-hole planar gate is novel in structural design, and water leakage at the top of the gate can be effectively prevented and vertical vibration of the gate can be weakened in the waterstop and operating process of the down-the-hole planar gate.