208results about How to "Reduce dynamic load" patented technology

The invention discloses a rotational speed and torque control method of a wind turbine generator set. Under the situation that the measured rotational speed of a power generator is higher than the rated rotational speed and the measured power exceeds the rated power, the torque is switched from a PI (proportional-integral) control way to a constant power control way; under the situation that the pitch angle is smaller than the optimal pitch angle and the measured rotational speed is lowered below the rated rotational speed, the toque is converted from the constant power control way to the PI control way; and the pitch angle is controlled in a PI control parameter non-linear adjustment way, and the pitch control is in an activated state within the whole normal working rotational speed range. According to the rotational speed and torque control method of the wind turbine generator set provided by the invention, the problem of greater fluctuation in the rotational speed caused by desynchrony of the two types of control can be avoided by changing control target points of two controllers in a transition region, the transition region is improved from the original points to a curve, the flexible switching of the control states is easier to realize, and the stability in operation of the unit and the power output of the unit can be ensured.

A bearing structure is provided with a turbine side bearing metal (30a) and a compressor side bearing metal (30b) in which an outer peripheral surface is fitted to a bearing hole (16a) of a bearing housing (16) with a gap, and an inner peripheral surface rotatably supports a turbine shaft (12), and a bearing locking member (32) holding the turbine side bearing metal and the compressor side bearing metal so as to be movable in a radial direction of the turbine shaft and inhibit a movement in an axial direction and a rotating direction. The inner peripheral surface and/or the outer peripheral surface of the bearing metal (30b) (or 30b) is structured as a non-complete round bearing.

A method for controlling the initial start of vehicle features that the rotation speed of engine and the position of throttle pedal are detected for controlling the position of clutch. Its controller is composed of a signal acquisition unit with throttle pedal position sensor and rotation speed sensor of engine, an electric control unit consisting of data receiving module, data processing module and data control module, throttle motor, and clutch motor.

The invention discloses a centripetal thrust protection bearing device for automatically eliminating a protection clearance in a magnetic suspension bearing system. The centripetal thrust protection bearing device comprises a rotary shaft, a rotor assembly, a sliding block, an installation seat and a bearing seat, wherein two angular contact ball bearings are arranged between inner cavities of the installation seat and the bearing seat; the sliding block comprises more than two sliding block sub-bodies; each sliding block sub-body is arranged in a sliding block guide groove through a sliding rod; all the sliding rods are connected into a whole through an annular connecting piece; waist-shaped holes are formed in positions, corresponding to the sliding rods, on the annular connecting piece; at least one sliding block sub-body is provided with a sliding block retaining device; a proper axial clearance is formed between the rotary shaft and the installation seat. Therefore, the device can protect a rotor in the radial and axial directions when the magnetic suspension bearing system fails and the rotor drops, and a radial clearance between the rotary assembly and a rolling bearing can be eliminated, so that vibration and impact on the rolling bearing after the high-speed rotor drops are eliminated, and the reliability and the safety of a centripetal thrust protection bearing are improved.

The invention discloses a dynamic load reduction device for backpacks, comprising an upper cross beam, a lower cross beam, guide rails, guide wheels, guide wheel supports, a sliding connection rack, springs, a spring connection shaft, a pull rope and a back plate. The upper cross beam is connected with the lower cross beam through the guide rails; the guide rails are mounted at the two ends of theupper and lower cross beams and are perpendicular to the upper and lower cross beams; the guide wheel supports are mounted on the upper cross beam and are connected with the guide wheels; the back plate is fixedly connected with the upper and lower cross beams; two ends of the sliding connection rack are fitted to the guide rails on the two sides respectively; one ends of the springs are fixed tothe lower cross beam; the other ends of the springs are fixedly connected with the spring connection shaft; one end of the pull rope is connected with the spring connection shaft, and the other end of the pull rope is passed around the guide wheels and is fixed to the sliding connection rack. The dynamic load reduction device for backpacks reduces load by making use of frequency and phase differences of damping mass and the vibrating human body, operating efficiency is improved, and the burden of field operators is reduced.

The invention discloses a radial protection bearing device for automatically removing a radial clearance of an outer ring of a rolling bearing. The radial protection bearing device comprises a mounting seat, a support seat, the rolling bearing and a rotor assembly, wherein the rolling bearing is connected with the rotor assembly in an interference fit manner, the support seat and the rotor assembly are concentrically arranged, and a proper radial clearance is formed between an inner circle of the support seat and the outer ring of the rolling bearing; the support seat comprises more than two circumferentially and uniformly arranged support seat branch bodies which are all arranged together with the mounting seat in a locating manner by a first locating pin and are all connected into an integrated body by an annular connecting piece through a second locating pin; at least one support seat branch body is provided with a support seat adjusting device; and the support seat adjusting device comprises two groups of elastic connecting pieces for remaining the concentricity of each support seat branch body and the rotor assembly. Therefore, after the rotor assembly falls down, the radial clearance between the outer ring of the rolling bearing and the support seat can be automatically removed, so that the impact and vibration on the rolling bearing are eliminated, and the reliability and safety of the radial protection bearing are improved.

An electric brake system for an aircraft employs a brake control process to alleviate high dynamic structural loading of the aircraft landing gear caused by braking maneuvers. The system obtains and processes real-time data—which may include the current aircraft speed, the current brake pedal deflection position, and the current brake pedal deflection rate—to determine how best to control the onset of the brakes. The braking control scheme delays the onset of the desired braking condition to reduce high dynamic loading and lurching of the aircraft.

A method for reducing resonant vibrations and dynamic loads of cranes, whose horizontal and vertical motion of the pay load are controlled by a boom winch controlling the luffing motion of a pivoting boom and a hoist winch controlling the vertical distance between a boom tip and the load. Where the method includes determining the resonance frequencies of the coupled crane boom and load system, either experimentally or theoretically at least from data on inertia of the boom and stiffness of at least a boom rope, a hoist rope, a pedestal and an A-frame. The method further includes automatically generating a damping motion in at least one of said winches, that counteracts dynamic oscillations in the crane, and adding this damping motion to the motion determined by a crane operator.

The invention discloses a self-propelled grass block baling machine, which belongs to the field of agricultural machinery. The self-propelled grass block baling machine mainly comprises a base plate part, a cab, a picking-up and conveying part, a feeding part, a compressing and knotting part and a power transmission part, wherein the base plate part is fixedly arranged below a frame; the cab is arranged in front of the frame; and the compressing and knotting part is arranged on the middle part of the frame. The power of the entire machine comes from an engine. According to the self-propelled square grass baling machine, the turning radius is reduced to a great extent by using a self-propelled design and rear wheel steering, and dry grass pick-up and baling combined operation at plots with small planting areas at mountain areas is facilitated; by using hydraulic speed changing and hydraulic steering, a driver can realize larger steering force control by using smaller operation force through the hydraulic speed changing and the hydraulic steering; the traveling speed can be adjusted in real time in operation according to the condition of swath thickness; in addition, the dynamic load of a transmission system is greatly relieved, the vibration is reduced, the situation that the engine works at the optimal working point is guaranteed, and the vehicle dynamic property, the fuel oil economy and the working efficiency are favorably improved; and the self-propelled square grass baling machine has the advantages of safe and reliable performance, and easiness, convenience and flexibility in operation.

The invention discloses a high-speed swing bearing fatigue life test device. The device comprises a console, and a driving motor, a rotary swing conversion module, a plurality of test modules and testbearings which are arranged on the console, wherein jackets sleeve the test bearings; each test module comprises a radial sine pulse loading module, a friction torque monitoring module, a temperaturedetection module and a bearing supporting module; the radial sine pulse loading modules in the plurality of test modules are connected to each other; the bearing supporting modules in the plurality of test modules are connected to each other; the rotary swing conversion module is provided with a flywheel and is directly connected to a driving motor; the rotary swing conversion module simultaneously drives the test bearings to rotate and swing in a reciprocating manner and the radial sine pulse loading modules to provide pulse radial loads for the test bearings. According to the technical scheme, the friction torque change situation of the plurality of test bearings under different test conditions can be monitored in real time, so that whether the bearing has a failure condition is judged.

The invention discloses a heat dissipating device for a 3D printing nozzle and a printing plate. The heat dissipating device comprises a machine body, wherein an inner wall opposite to the machine body is fixedly connected with a cantilever beam; a slide carriage box is arranged on the cantilever beam; a lower end of the slide carriage box is fixedly connected with a nozzle heat-dissipating device; a fixing plate is arranged in the machine body; the fixing plate is fixedly connected to the inner bottom of the machine body by a support frame; a groove is formed in an upper end of the fixing plate; a printing plate placing device is arranged in the groove; and a lower end of the machine body is fixedly connected with a damping support base. The heat dissipating device provided by the invention is reasonable in structural design and convenient to place and fix a printing plate; the nozzle heat-dissipating device effectively overcomes defects that one heat dissipating fan is directly fixedbeside the nozzle to dissipate heat of the nozzle in the prior art, but vibration generated by operation of the heat dissipating fan can seriously affect the molding quality of a 3D printer in the printing process.

The present invention relates to a crane control for the control of a hoisting gear of a crane which takes account of oscillation dynamics based on the elasticity of the hoist rope on the control of the hoisting gear and reduces them by a suitable control of the hoisting gear.

The invention discloses a radial protection bearing device for automatically eliminating the radial clearance of a rolling bearing inner ring. The radial protection bearing device comprises an outer-layer mounting base, an inner-layer mounting base, a support seat and a rotor assembly, wherein a rolling bearing is mounted between a bearing mounting neck of the inner-layer mounting base and an inner cavity of the outer-layer mounting base; the inner circle of the support seat is concentrically arranged with the rotor assembly; the support seat comprises more than two support seat branch bodies which are positioned with the inner-layer mounting base through first positioning pins; the support seat branch bodies are connected to from a whole body by adopting second positioning pins through annular connecting pieces; and at least one support seat branch body is equipped with a support seat adjusting device which can be used for maintaining the concentricity between the support seat and the rotor assembly. Therefore, according to the radial protection bearing device disclosed by the invention, the radial clearance between the rotor assembly and the rolling bearing can be automatically eliminated after a magnetic suspension bearing system is failed and a rotor falls off, furthermore, the impact and the vibration to the rolling bearing caused by the fall of the rotor assembly are eliminated, and the reliability and the safety of the radial protection bearing are enhanced to meet the requirement of a high-speed magnetic suspension bearing system.

A tensioner which adjusts the mean tensioner force to keep the chain tension as low as possible without sacrificing chain control, significantly improving drive efficiency as the chain wears and is subject to low dynamic loads.

The invention discloses an aluminum alloy machined part environment-friendly spraying device. The aluminum alloy machined part environment-friendly spraying device comprises a device body, a hydraulicoil cylinder is fixedly connected to the inner top of the device body, an arc plate is fixedly connected to the telescopic end of the hydraulic oil cylinder, multiple sprayers are fixedly connected to the inner wall of the arc plate at equal intervals, a coating tank is fixedly connected to the inner wall of the device body, a delivery pipe is fixedly connected to the side wall of the coating tank, the output end of the delivery pipe is fixedly connected with the sprayers, and a driving motor is fixedly connected to the side wall of the device body. By means of the aluminum alloy machined part environment-friendly spraying device, through the arrangement of a negative pressure draught fan and a storage bucket, particles generated in the spraying process are collected into the storage bucket, and the environment pollution is reduced; through second springs, the vibration inertia of the device is reduced, dynamic loads transmitted to a foundation are reduced, then the device more stablyruns, and the spraying effect is better; the sprayers are aslant arranged below the arc plate, so that the spraying range is wider, corners of an aluminum alloy workpiece can be sprayed, and the product quality is improved.