153results about How to "Reduce vibration levels" patented technology

The invention discloses a large-torque magnetic suspension flywheel, which can be used as an execution mechanism for attitude stabilization and attitude maneuver of spacecrafts such as a satellite, an earth observation platform and the like. The magnetic suspension flywheel mainly consists of a base, a sealing cover, a radial decoupling conical magnetic bearing assembly, a core shaft, a rotor assembly, a Lorentz force magnetic bearing assembly, a motor assembly, a sensor assembly and the like. The core shaft is positioned in the center of the wheel body, a stator assembly is positioned at theradial outer side of the core shaft, the rotor assembly is arranged at the radial outer side of the stator assembly, the rotor assembly consists of a wheel flange and a wheel hub, and the Lorentz force magnetic bearing assembly consists of a magnetic bearing stator part and a magnetic bearing rotor part; an adapter plate is connected with the core shaft, the stator assembly and a motor stator; and the sensor assembly consists of a sensor shell and a sensor. The components of the flywheel are arranged reasonably and compactly, the flywheel can be used for attitude stabilization of the spacecraft, and attitude maneuver of the spacecraft can be realized by using large control torque provided by gyroscopic effect of the magnetic suspension flywheel.

This invention relates to an endless traction band that is used to propel snowmobiles and more particularly, to an improved ground-engaging side of the traction band, which helps reduce the noise and vibration levels during the operation of the snowmobile. The various protruding lug configurations defines a predetermined number of different lug profiles, from which the sequence of profiles on the endless band are generated in such a way so that every sequence of profiles is different from one another.

A combustion chamber pressure sensor for an internal combustion engine includes an elongated pressure transmitting member having one end exposed to the interior of an engine cylinder and the opposite end contacting a pressure sensing element which generates a pressure measurement signal, the pressure transmitting member and pressure sensing element being contained within an elongated housing. A damping body formed of a viscoelastic material is disposed on an outer or inner circumferential surface of the housing, for reducing an amount of engine vibration that is transmitted to the pressure sensing element and thereby reducing noise in the pressure measurement signal.

A dual-crankshaft engine is presented. In one embodiment, the engine includes a first crankshaft and a second crankshaft. The second crankshaft is coupled with the first crankshaft such that the first crankshaft and the second crankshaft are horizontally coplanar. The engine further includes a first piston that is operable to reciprocate in a first horizontal cylinder via coupling with the first crankshaft, and a second piston that is operable to reciprocate in a second horizontal cylinder via coupling with the second crankshaft. The second horizontal cylinder is horizontally collinear with and opposing the first horizontal cylinder.

The invention provides a hard rock road-header damping design method based on a multi-tuning mass damper. The hard rock road-header damping design method comprises the steps of establishing a hard rock road-header whole-machine rigid-flexible coupling multi-body dynamics model; 2, calculating hob dynamic rock breaking force and shield-surrounding rock mutual acting force and simulating hard rock road-header vibration exciting force; 3, analyzing and evaluating hard rock road-header driving performance and the whole-machine vibration level; 4, installing the multi-tuning mass damper on a hard rock road-header gearbox; 5, determining the quantity, distribution mode, mass, rigidity and damping of damper bodies in the multi-tuning mass damper by minimizing a minimal whole-machine vibration level index value or a maximal whole-machine vibration level index value of a minimal driving performance index. By arranging the multi-tuning mass damper on the hard rock driving gearbox and optimizing parameters of the multi-tuning mass damper, on the basis of improving or maintaining the hard rock road-header driving performance, the whole-machine vibration can be effectively lowered, and the damage to key parts caused by strong vibration can be avoided or lowered.

The invention provides an idle speed control method for a hybrid power system. The method includes the steps that firstly, whether a vehicle is in an idle speed working condition or not is judged; secondly, if the vehicle is in the idle speed working condition, whether a motor system or a battery system breaks down or not is judged, if the motor system or the battery system breaks down, the third step is executed, and if the motor system or the battery system does not break down, the fourth step is executed; thirdly, the motor torque is set to be zero through an HCU, an idle speed control mode is set to be an EMS idle speed control mode, and idle speed control is executed through an EMS; and fourthly, the idle speed control mode is set to be an HCU idle speed control mode through the HCU, and idle speed control is executed through an HCU control motor and the EMS. By the adoption of the method, the motor torque is controlled through the HUC to control the idle rotation speed of an engine, the stability, accuracy and rapidness of idle speed control can be improved, the low noise and vibration level is obtained, frequent ignition angle adjustment of the engine can be avoided, and therefore the idle speed oil consumption is reduced.

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

A combustion chamber pressure sensor for an internal combustion engine includes an elongated pressure transmitting member having one end exposed to the interior of an engine cylinder and the opposite end contacting a pressure sensing element which generates a pressure measurement signal, the pressure transmitting member and pressure sensing element being contained within an elongated housing. A damping body formed of a viscoelastic material is disposed on an outer or inner circumferential surface of the housing, for reducing an amount of engine vibration that is transmitted to the pressure sensing element and thereby reducing noise in the pressure measurement signal.

A dynamic damper containing a mass and an elastic connector is connected to an inner tube to provide the dynamic damper integrally as a part of an apparatus. Since the dynamic damper is integrally provided as part of the apparatus (cab mount) by connecting the dynamic damper containing the mass and the elastic connector to the inner tube via a connecting member in the cab mount, it is possible to eliminate work for assembling the dynamic damper separately from the cab mount. Further, the dynamic damper may be constructed integrally as part of the cab mount.

A washing machine and a control method thereof are provided, which control a rotational speed of a rotary tub (or revolutions per minute: RPM of a motor) according to a vibration level thereof to attenuate a vibration of the rotary tub. The washing machine includes the rotary tub, the motor, a vibration detecting unit and a control unit. The motor is linked to the rotary tub to be supplied with drive power and rotates the rotary tub. The vibration detecting unit detects the vibration level of the rotary tub using a variation of the drive power supplied to the motor when the motorrotates. The control unit controls a current rotational speed of the motor to be increased, maintained or decreased according to the vibration level of the rotary tub detected by the vibration detecting unit.

The invention provides a high-temperature component for a turbomachine, in particular for a blade or vane having a main blade or vane part and a blade or vane root, the high-temperature component at least partially comprising, as base material, a porous material which is filled with a viscous filler and is surrounded by a solid layer.

A dynamic damper containing a mass and an elastic connector is connected to an inner tube to provide the dynamic damper integrally as a part of an apparatus. Since the dynamic damper is integrally provided as part of the apparatus (cab mount) by connecting the dynamic damper containing the mass and the elastic connector to the inner tube via a connecting member in the cab mount, it is possible to eliminate work for assembling the dynamic damper separately from the cab mount. Further, the dynamic damper may be constructed integrally as part of the cab mount.

The invention, which belongs to the helicopter model rotor wing test field, provides a correction-function-contained dynamic balance adjustment phase calculating method of a helicopter model. The method is characterized in that frequency spectrum calculation is carried out on a vibration signal and a rotating speed signal, wherein the signals are obtained by measurement; a reference frequency is obtained based on rotating speed conversion and an amplitude and phase corresponding to the reference frequency are taken out from the vibration and rotating speed frequency spectrum; a vibration phase is corrected by a rotating speed phase; and then calculation is carried out again to obtain an adjustment phase value needing to increase the balance weight. According to the invention, a problem of inaccurate adjustment phase calculation due to the different sensor and collector and the application environment interference can be solved. Therefore, the dynamic balance adjustment phase calculating method that is capable of realizing accurate calculation of the adjustment phase can be established.

A handle of a handheld working tool has a handle pipe reinforced by at least one reinforcement element locally arranged on the handle pipe at a location of high dynamic vibration-caused deformation energy. The handle pipe and the reinforcement element are made of plastic material. A laminate that is made of fiber-reinforced plastic material can be used for making the handle.

The invention provides a transmission system torsional vibration reducing method and application thereof. The method is characterized in that a torsional vibration damper, which is a tuned rotary inertia damper, is added on a transmission shaft in a parallel connection manner, and the torsional rotation movement around the transmission shaft is used for reducing the vibration level of a certain first order torsional mode frequency. The method is flexible, can effectively reduce vibration without damage to the original structure of the transmission system, and can be used for later repair of the transmission system. The method can be applied to wind energy / tidal current energy generator sets; the torsional vibration damper is installed on a shaft, connected with a generator, of a high speed shaft coupler to greatly reduce a first-order mode component in the torsional vibration, so that a transmission system can operate more stably, the reliability of the structure can be improved and the service life can be prolonged.

The invention discloses a suspended type monorail transit track beam, belongs to the technical field of rail traffic and aims at providing the suspended type monorail transit track beam. By improvingthe vibration absorbing performance of the suspended type monorail transit track beam, the train running comfort is improved. The suspended type monorail transit track beam comprises a track beam topplate, track beam web plates and track beam bottom plates, wherein the track beam web plates are arranged on the left and right sides of the track beam top plate, and the track beam bottom plates arearranged on the internal side walls of the track beam web plates; vibration absorbing rubber pads are arranged on the track beam bottom plates; running rails are arranged on the vibration absorbing rubber pads; and the running rails are connected to the track beam bottom plates through fastener systems. The suspended type monorail transit track beam is applicable to the suspended type monorail transit track beams.

An embodiment of the present invention may reduce the level of vibration experienced by a line, such as, but not limiting of, a pipe, a cable, tubing, or the like, that is connected to at least one separate structure. For example, but not limiting of, the structure includes: a reactor pressure vessel, a feedwater sparger pipe, steam generator, a pipe, a pressure vessel, a heat exchanger, a pump, a condenser, a tank, or the like. An embodiment of the present invention may provide support and a preload to the line at a new location or may replace an existing support, such as, but not limiting of, a weld; which may alter the natural frequencies to avoid resonance from occurring when the structure(s) is excited.

The invention relates to a mechanical frequency modulation type dynamic absorber for a satellite flywheel. A guide rod is vertically fixed to the center of a bottom plate. A shock absorption mass block horizontally moves in the axial direction of the guide rod through a linear bearing. Linear modules are symmetrically arranged on the two sides of the guide rod. The mechanical frequency modulation type dynamic absorber comprises a guide rail, a ball screw, a ball nut sliding block, a leaf spring assembly and a motor connection seat, wherein the guide rail is fixed to the bottom plate, the ball screw is arranged on the guide rail, the ball nut sliding block is arranged on the ball screw, the leaf spring assembly is connected between the shock absorption mass block and the ball nut sliding block. The motor connection seat is fixed to one end of the guide rail. By adoption of the symmetrical structural design, the inherent structure frequency is adjusted according to the mechanical frequency modulation principle and changes of the rotation speed of the flywheel, vibration of the flywheel is controlled and restrained to a low order, stability and reliability of the on-satellite high-accuracy sensitivity load in-orbit operation are ensured, and the mechanical frequency modulation type dynamic absorber has the advantages that the frequency tracing speed is high, the vibration absorption performance is excellent, the structure is simple, reliability is high, assembly is convenient, and the manufacturing cost is low.

The invention provides a centralized mounting bracket for avionics equipment. Centralized and fast loading and unloading of multiple avionics equipment can be achieved. The centralized mounting bracket includes a fast loading and unloading mechanism, a damping mechanism, a ventilating and cooling pipeline, and a communication channel for communication between equipment as well as between a systemand an aircraft. The fast loading and unloading mechanism comprises fasteners and spring positioning pins which are arranged on the centralized mounting bracket, and a locking handle on the avionics equipment. The damping system consists of six dampers, the vibration magnitude of the avionics equipment can be effectively decreased, and the reliability of the system is improved. The ventilating andcooling pipeline includes an air inlet pipe, an air cavity, a ventilating pipe and a sealing ring and can provide air cooling conditions for the avionics equipment, the working temperature of internal electronic components can be effectively adjusted, and the working reliability is improved. The communication channel for communication between equipment as well as between the system and the aircraft comprises circular connectors mounted on a back shell and a left shell of the centralized mounting bracket and a rectangular connector mounted on a front cover plate, and communication connection between equipment as well as between the system and the aircraft is achieved.

The invention relates to an electric machine, in particular a starter device (10) for an internal combustion engine. The electric machine comprises a noise-optimized toothing system (232, 234) of two gearwheels (22, 25) which can be brought into engagement with one another. The noise-optimized toothing system (232, 234) is configured as an extra-deep toothing system on at least one of the gearwheels (22, 25). The extra-deep toothing system has an asymmetrical toothing profile (214).

The present invention relates to a wind turbine and a method of operating a wind turbine for reducing edgewise vibrations, wherein the wind turbine comprises a wind turbine control system having at least one vibration sensor for measuring the edgewise vibrations and a controller for receiving the vibration signal from the vibration sensor. The sensor unit is preferably an accelerometer arranged in a stationary frame of reference. The controller determines at least one whirling mode frequency and the vibration level thereof. The controller initiates a corrective action if the measured vibration level exceeds a threshold value. The corrective action is preferably an adjustment of the pitch angle of the wind turbine blades which in turn dampens the edgewise vibrations.

The invention discloses a rail beam dust-removing deicing vehicle and a suspended type monorail traffic system, belongs to the technical field of rail transportation and is aimed to provide the rail beam dust-removing deicing vehicle and the suspended type monorail transportation system to solve vehicle-driving safety hazards such as wheel slippage and brake failure caused by thin ice and carbon brush powder. The rail beam dust-removing deicing vehicle includes a vehicle body, a dust-removing and deicing mechanism is arranged on the vehicle body, the dust-removing deicing mechanism includes anice-breaking assembly, an ice-milling assembly and a dust-removing and ice-sweeping assembly, and the ice-breaking assembly, the ice-milling assembly and the dust-removing and ice-sweeping assembly are installed on the vehicle body in the driving direction in sequence. The suspended type monorail transportation system includes a rail beam, the rail beam includes a rail beam top plate, a rail beamweb plate and a rail beam bottom plate, and the rail beam dust-removing deicing vehicle is arranged in the rail beam. The rail beam dust-removing deicing vehicle is used for deicing and dust-removingof the rail beam.

An isolating assembly, a modular isolating system including the assembly and a method of using the same. The system includes a plurality of individual isolating assemblies, each isolating assembly being engageable with an article; and wherein each isolating assembly includes a lower isolator that rests upon a flat surface; an upper isolator that is engageable with the article; and a connector having first and second ends. The first end of the connector engages the lower isolator and the second end of the connector engages the upper isolator. The upper isolator is positioned above the lower isolator and is movable relative to the lower isolator when vibration from the article is transferred to the upper isolator. The connector may be a polarizing connector that restricts the movement of the upper isolator in a first direction but permits movement thereof in a second direction that is orthogonal to the first direction.

The invention relates to a wheel-mounted lawnmower (1) or the like of the type comprising a cutting device (2) which is connected to a motor (3) for performing a cutting function, the lawnmower (1) being operated by an operating means (4). The lawnmower (1) has a first unit (5) which is provided with said cutting device (2) and said motor (3), a second unit (6) which has at least two rotatable wheels (7) for moving the lawnmower relative to a base, a wheel frame (8) for arranging the wheels and for arranging said operating means (4) on said wheel frame (8), and an insulator (9) which is arranged to at least partially mutually connect said first (5) and second (6) unit to reduce any vibrations between said units (5, 6). The invention also relates to an insulator arranged on a lawnmower or the like. The invention also concerns us eof a lawnmower or the like as stated above.

The invention discloses a drive device of a magnet exciting coil with an online magnetic balancing head. The drive device comprises a voltage regulating circuit and a current regulating circuit, wherein the voltage regulating circuit is composed of a comparison circuit, a metal-oxide-semiconductor field effect transistor (MOSFET) drive circuit, an MOSFET and a filter circuit and can convert a voltage signal output by a controller into a power signal with a wave form similar to that of the voltage signal; and the current regulating circuit is composed of an H bridge circuit and two half-bridge drive circuits and can change a current direction of the power signal output by the voltage regulating circuit in a staggered manner by controlling the H bridge circuit to switch on or off a bridge so as to meet a requirement for an operation of a drive coil with a dynamic balancing head. By coordinating the voltage regulating circuit with the current regulating circuit, drive voltages meeting the requirement for a magnet exciting coil with an online active balancing head can be outputted. The drive circuit provided by the invention is adopted, so that the magnet exciting coil with a balancing head can be driven so as to rotate a counterweight plate in relative to a main shaft, thus further correcting imbalance of the high-speed main shaft. Therefore, a vibration level of a machine is reduced, and operation quality, efficiency and service life of the machine are improved.

Provided is an exhaust turbine equipped with an exhaust control valve which can reduce wear of the contact surfaces between the shaft and the bushing or the turbine casing. The exhaust turbine is equipped with the exhaust control valve for opening / closing an exhaust bypass passage leading the exhaust turbine being driven by exhaust gas output from an engine to an exhaust outlet passage while bypassing the exhaust turbine, wherein the exhaust control valve comprises a shaft which is supported rotation-freely by a turbine casing and supports a valve element, an arm equipped with a connecting part with a drive source and turning the shaft about the axis thereof by the reciprocating motion of the connecting part produced by the drive source, and a weight attached to an end on the side opposite to the connecting part with the drive source with respect to the axis of the shaft.

The invention provides a honeycomb type periodic row pile vibration isolation device. The device comprises a honeycomb type periodically designed row pile structure, wherein the row pile structure comprises a plurality of row piles, and the cross section of each row pile is in a regular hexagon shape. The row piles comprise scattering type row piles and local resonance type row piles, scatterers of the scattering type row piles are made of a single material, and wrapping layers made of different materials are added between base bodies of the local resonance type row piles and the scatterers. The arrangement mode of the row piles comprises hexagonal lattice arrangement, square lattice arrangement and rectangular lattice arrangement with different length-width ratios. According to the device, the elastic wave band gap characteristic of a periodic structure (row pile) is utilized, so that the vibration level of a target frequency band is remarkably reduced, and the vibration reduction requirement is met.

The invention relates to a control system and method for a helicopter electrically-driven tail rotor. The control system comprises a pedal, an angular displacement sensor, a helicopter controller, a motor controller, a driver for a tail rotor driving motor, a motor driver of a tail rotor variable pitch structure, a detection unit, a gyroscope, a motor-reducer integrated structure capable of driving the tail rotor to rotate, and an electrically-driven variable pitch structure. By use of the control method, according to a pedal angle change and a helicopter tail gesture change of gyroscope detection, the revolving speed of the tail rotor driving motor is automatically controlled, and a variable pitch structure is regulated so as to realize the balance or the diversion of the helicopter. Theinvention provides the control system and method for the helicopter electrically-driven tail rotor, and replaces the internal combustion engine driving and the excessive transmission shaft of a traditional helicopter, so that the quick and stable automatic balance and diversion of the helicopter can be realized, operation difficulty is reduced, and reliability and stability are enhanced so as to be favorable for accelerating the technology of an electric helicopter to be progressed and developed.