455results about How to "Reduce mechanical vibration" patented technology

In order to form a noise suppressor in a hose of e.g. a motor vehicle, modular portions are connected in series to define suppression chambers with particular noise suppression characteristics. Those characteristics are due to the volume of each chamber, to the size of the apertures from the chambers to the central duct of the suppressor, and optionally due to spacers which are inserted into at least one aperture of the chambers to alter the effective open area of that aperture. Such spacers may also be used in which the noise suppressor is not modular. Where modular portions are used, it is preferable that each chamber is bounded by parts of two modular portions. A wall of one modular portion may then close the chamber in another modular portion, making the manufacture of the modular portions easier. Also disclosed is the use of a mass acting as a damper, which may be a noise suppressor as previously discussed, within a hose. The mass is connected to the hose by resilient means, e.g. electrometric material.

This invention is a probe apparatus including: a stage onto which a substrate to be processed is placed, a semiconductor device having a plurality of groups of electrode pads being formed on the substrate to be processed; a probe-card holding mechanism that holds a probe card provided with a group of probe needles corresponding to each group of electrode pads; and a driving mechanism that moves the stage and causes the group of probe needles to successively come in contact with the respective groups of electrode pads. A converting device that converts mechanical vibration energy generated in components of the probe apparatus into electrical energy, and an electrical circuit that discreates an electrical current based on the electric energy converted by the converting device are further provided.

The invention provides a mechanical arm obstacle avoidance path planning method and device and a storage device. The mechanical arm obstacle avoidance path planning method is characterized in that animproved A * algorithm is adopted, the obstacle avoidance path of the tail end of a mechanical arm from a starting node to a target node is searched, so that the problem that the mechanical arm collides with an obstacle is solved, smoothing treatment is carried out on the obstacle avoidance path according to a cubic uniform B-spline curve method, so that the problem that due to the fact that the mechanical arm shakes, the control error is large is solved. The mechanical arm obstacle avoidance path planning device and the storage device are used for achieving the mechanical arm obstacle avoidance path planning method. The mechanical arm obstacle avoidance path planning method and device and the storage device have the beneficial effects that through the provided technical scheme, the mechanical arm is prevented from colliding with the obstacle in the working process, the control error of the mechanical arm is reduced, the path tracking precision of the mechanical arm is improved, the mechanical vibration generated in the movement process of the mechanical arm is reduced, and the service life of the mechanical arm is prolonged.

The invention discloses a built-in permanent-magnetic motor rotor, which comprises a rotating shaft and a rotor iron core, wherein the rotor iron core comprises a pole shoe, at least one permanent magnet body is arranged inside the pole shoe, and the outer circle of the pole shoe is provided with a plurality of grooves. The invention also discloses a motor, which comprises a stator and the rotor. Due to the adoption of the built-in permanent-magnetic motor rotor, the waveform of an air gap field of the motor can be improved, fundamental wave times of the cogging torque fluctuation can be increased, the cogging fundamental wave and the ultra-harmonics torque amplitude can be reduced, and the torque fluctuation caused by the cogging can be reduced.

A method for conducting laser absorption measurements in high temperature process streams having high levels of particulate matter is disclosed. An impinger is positioned substantially parallel to a laser beam propagation path and at upstream position relative to the laser beam. Beam shielding pipes shield the beam from the surrounding environment. Measurement is conducted only in the gap between the two shielding pipes where the beam propagates through the process gas. The impinger facilitates reduced particle presence in the measurement beam, resulting in improved SNR (signal-to-noise) and improved sensitivity and dynamic range of the measurement.

The invention is for an apparatus and method for a refrigerator and a heat pump based on the magnetocaloric effect (MCE) offering a simpler, lighter, robust, more compact, environmentally compatible, and energy efficient alternative to traditional vapor-compression devices. The subject magnetocaloric apparatus alternately exposes a magnetocaloric material to strong and weak magnetic field while switching heat to and from the material. Action of the heat switches is coordinated with the magnetic field strength to move heat up the thermal gradient. The invention may be practiced with multiple magnetocaloric stages to attain large differences in temperature. Key applications include thermal management of electronics, as well as industrial and home refrigeration, heating, and air conditioning. The invention offers a simpler, lighter, compact, and robust apparatus compared to magnetocaloric devices of prior art. Furthermore, the invention may be run in reverse as a thermodynamic engine, receiving low-level heat and producing mechanical energy.

Aiming at the problems of intrinsic great inertia of a wind generating set and difficulty in accurate mathematical modeling, the invention provides a wind generating set variable-pitch control method combining fuzzy feed-forward with linear active disturbance rejection. The method includes: firstly, constructing a mathematical model of a variable-pitch wind generating set and obtaining output active power of the wind generating set; secondly, designing a linear active disturbance rejection controller on the basis of the step 1, and rapidly eliminating perturbation and external disturbance effects of unmodeled system portions by adjusting controlling quality of the active disturbance rejection controller; thirdly, designing a fuzzy feed-forward controller on the basis of the step 2, and obtaining a proper feed-forward pitch angle variation betaf, wherein the fuzzy feed-forward controller comprises a fuzzy feed-forward controller rule list; and finally, adding the feed-forward pitch angle variation betaf to an output u of the linear active disturbance rejection controller so that a pitch angle set value betar is obtained. By the method, adjusting time of a system is shortened, stability and reliability of the system are enhanced, and the controllers have distinct advantages over existing traditional controllers.

The invention belongs to the technical field of air compressors, and relates to a low-noise structural oilless air compressor which comprises a cylinder, a cylinder cover and a piston, wherein the piston is provided with a sealing ring or a sealing leather cup made of a self-lubricating material, a crankcase is tightly connected with a crankcase cover plate and forms a crankcase intake muffler, an air intake one-way valve is arranged at an air intake or an air intake passage of the crankcase intake muffler communicated with the outside atmosphere, a damping pad is arranged between an exhaust valve plate and a valve seat, the valve seat is connected with a silencing cap, a crank pin is made into the shape of a spline or similar to the spline, a heat insulation hole or a heat insulation slot is arranged on a connecting rod body, and a heat insulation pad is arranged at the joint of a fastening bolt and the piston or a connecting rod. The low-noise structural oilless air compressor has the advantages that the air intake noise is low, the working temperature and the mechanical noise of a bearing are low, and an auxiliary balance block is arranged on a cooling fan, thereby reducing the vibration amplitude of the compressors, and effectively reducing the body vibration noise.

A scanner for probe microscopy that avoids low resonance frequencies and accounts better for piezo nonlinearities. The x, y and z axes of a linear stack scanner are partially decoupled from each other while maintaining all mechanical joints stiff in the direction of actuation. The scanning probe microscope comprises a probe, a housing, at least two actuators, each coupled to the housing, and a support coupled to the housing and to at least a first of the actuators at a position spaced from the point at which the actuator is coupled to the housing. The support constrains the motion of the first actuator along a first axis while permitting translation along a second axis. The actuators are preferably orthogonally arranged linear stacks of flat piezos, preferably in push-pull configuration. The support can take different forms in different embodiments of the invention. In a particular embodiment, the scanner is a 2D scanner having a support frame with x and y axes, and a member for supporting an object to be moved such as a sample for a probe, the scanner comprising a flexure and flexure coupled cross-conformed piezos arranged along x and y axes. Expansion of the piezos is measured by at least two strain gauges disposed to measure the differential motion of at least two opposed actuators. The strain gauges are preferably arranged to compensate for ambient temperature changes, and preferably two or more strain gauges of identical type are disposed on each actuator to magnify the strain signal.

The invention provides a self-adaption starting torque compensation method of an elevator permanent magnet dragging guiding system without using a weighing sensor, belongs to the technical field of electrical machine and elevator dragging guiding control, and aims to solve the problem that elevator system reliability is reduced and production cost is increased due to the manner of acquiring elevator load weight information via the weighing sensor to maintain balance before the elevator system is in operation. The self-adaption starting torque compensation method includes adopting microprocessor to collect position signals output by a sine and cosine encoder, calculating to acquire current positional value theta of a permanent magnet synchronous motor, calculating to acquire current reversing distance theta m, reversing speed wk and reversing accelerated speed alpha k of the motor according to theta, and then confirming the starting torque compensation method of the motor and performing self-adaption compensation to starting torque of the permanent magnet synchronous motor. The self-adaption starting torque compensation method without using the weighing sensor is applicable to perform self-adaption compensation to starting torque of the elevator permanent magnet dragging guiding system.

The invention discloses a nonlinear feed-forward and fuzzy PID combined variable pitch control method for a wind generating set. The method comprises based on an active power deviation feed-forward control strategy, using active power P and rated power P0 of a generator to obtain the power deviation delta P when a generator unit operates above the rated wind speed; giving variable pitch control expected output pitch angle beta1 through an MAPSO fuzzy PID controller; obtaining a variable pitch control expected feed-forward pitch angle beta2 through a nonlinear feed-forward controller; adding the pitch angle beta1 obtained by the MAPSO fuzzy PID controller to the feed-forward pitch angle beta2 to obtain a pitch angle set value beta. By means of the method, the system adjusting time is reduced, the stability and the reliability of the system are increased, and compared with traditional controllers, apparent advantages are provided.

The present invention relates to an intelligent numerically-controlled plastering machine. It includes sensing system, moving device, balancing device, lifting and falling device, working head device, system control device and main machine external shell. Said system control device is a programable micro-type computer. Besides, said invention also provides the concrete structure of the above-mentioned every device and its operation method.

The invention discloses a liquid-injection type online dynamic balance head structure for high rotating speed, comprising a chassis and a water tank disc connected with the chassis, wherein a liquid injection hole is saliently arranged in the center of the chassis; the water tank disc is provided with a center hole which is sleeved with the liquid injection hole of the chassis; the inner side of the wall of the center hole of the water tank disc is provided with three parallel annular grooves which are circumferentially distributed; the outer side of the center hole of the water tank disc is provided with three sector-shaped liquid storage cavities which are evenly distributed; liquid outlet holes which are communicated with the liquid storage cavities and correspond to the liquid storage cavities are respectively arranged on the annular grooves of the center hole of the water tank disc; and liquid discharge holes are arranged on the outer side walls of the liquid storage cavies. The three liquid storage cavities are respectively of a design structure that the inner side is opened along the radial direction so as to enlarge and balance a liquid injection time window and realize 360-degree continuous liquid injection. The balance head structure is simple, has a low cost, can improve the balancing precision and efficiency through a low-flow continuous liquid injection mode, rectify the unbalance amount of a rotary machine and reduce the mechanical vibration. The invention is suitable for online dynamic balance of a rotor under a high rotating speed condition.

The invention provides a deburring machine tool for shaft parts, and belongs to the technical field of machinery. The deburring machine tool for the shaft parts solves the problem that an existing deburring machine tool for the shaft parts cannot conduct deburring on the two ends of the shaft parts simultaneously. The deburring machine tool for the shaft parts comprises a rack. A fixture for positioning the shaft parts is fixed to the rack, a pressing mechanism for pressing the shaft parts is arranged above the fixture, the two sides of the fixture are provided with sliding seats respectively, and all the sliding seats are provided with cutting tool assemblies and further provided with driving mechanisms for driving the cutting tool assemblies to rotate forward and reversely. A feeding mechanism capable of driving the sliding seat to be close to or away from the fixture is further arranged on the rack. According to the deburring machine tool for the shaft parts, the cutting tool assemblies arranged on the two sides of the fixture conduct deburring on the thread parts of the shaft parts positioned on the fixture simultaneously, automatic deburring is achieved, and the deburring machine tool is higher in production and machining efficiency.

The invention provides a portable three-dimensional visual photoacoustic imaging system, which comprises a central processing unit, a driving circuit, a data acquisition circuit, a signal amplification circuit, a signal pre-processing circuit, an ultrasonic sensor, an external circuit interface, laser diodes, a collimating lens group, a beam expanding lens group, a focusing lens group, an X-axis reflecting galvanometer, a Y-axis reflecting galvanometer, a field lens, a linear motor, an X-axis motor, a Y-axis motor and a shell. Fast and efficient three-axis scanning galvanometer technology is applied to the field of photoacoustic stimulation. The portable three-dimensional visual photoacoustic imaging system is integrated with the laser diodes, so that portable three-dimensional visual photoacoustic imaging can be realized. Besides, the portable three-dimensional visual photoacoustic imaging system can be widely applied to the field of material detection, industrial flaw detection, medical imaging and the like of complex structures such as square structures, tubular structure, film type structures and the like.

The invention relates to a soft start method of an efficient self-starting permanent magnet synchronous motor, which is characterized in that the rotor of the efficient self-starting permanent magnet synchronous motor is provided with a squirrel cage winding used for asynchronous self-starting and a permanent magnet pole; the stator of the efficient self-starting permanent magnet synchronous motor is provided with a set of pole-changing simplex windings with bipolar numbers; the permanent magnet pole numbers of the rotor are equal to twice of pole numbers of less connecting windings of the pole-changing windings; the pole numbers of multipolar connecting windings are equal to the permanent magnet pole numbers of the rotor, so that the permanent magnet synchronous motor can realize asynchronous self-starting in an asynchronous motor state and operates at a synchronous speed in a state approximate to the synchronous speed state, the soft self-starting of the efficient self-starting permanent magnet synchronous motor is realized, the efficient self-starting permanent magnet synchronous motor has the characteristics of large starting torque, small starting current, small mechanical vibration and the like, and the starting performance of the efficient self-starting permanent magnet synchronous motor is improved.

The invention provides an industrial robot track planning vertical speed control method based on a trigonometric function. The method comprises the steps of presetting a model based on position, speed, acceleration and jerk of the trigonometric function, and presetting positions and speed parameters of two anticipated points at a starting point and an ending point of a track planning curve; then, substituting the parameters of a boundary condition into the established model, generating an equation set and computing the parameter of the model; then, limiting the vertical speed control curve according to the positions and the speed parameters of the two anticipated points at the starting point and the ending point of the track planning curve and the acceleration and the jerk; and finally determining the anticipated planning track. The industrial robot track planning vertical speed control method can be used for generating the smooth and continuous curve and easily realizes tracking for the anticipated track. Furthermore the industrial robot track planning vertical speed control method is suitable for track planning of the industrial robot.

The invention discloses an asymmetric permanent magnet motor for a new energy automobile, relates to the technical field of motors, and aims to lower torque fluctuation. The motor comprises rotors and a stator, wherein a plurality of permanent magnet units are arranged on the rotors; and the permanent magnet units comprise permanent magnet grooves and magnetic steel embedded into the permanent magnet grooves. The asymmetric permanent magnet motor is characterized in that magnetic pole axes of the rotors partition the permanent magnet units into left halves and right halves; and the left halves and the right halves of the permanent magnet units have different structures. Through adoption of the motor provided by the invention, the comprehensive performance of the motor can be enhanced.

The present invention relates to improvements in acoustical venting of hearing aid earmolds and to miniature loudspeakers with housing structures configured to support improved hearing aid venting. The miniature loudspeaker comprises a front chamber with first and second separate sound ports so as to allow the front chamber to form an integral part of the acoustical vent of the hearing aid earmold. Thus, while using the same opening in the hearing aid for both sound output and venting, sound from the outside of the hearing aid may be introduced into the users ear via the same opening.

The invention discloses a yarn guiding device for textile product production. The device comprises a fixing bottom plate, a guiding assembly, a burr removing assembly and an adjusting assembly, the burr removing assembly comprises a guiding tube, a heating sleeve tube and a supporting frame, the heating sleeve tube is sleeved with the guiding wire, a heating wire is arranged in the heating tube, the adjusting assembly comprises a fixing plate, an adjusting plate and a pressurizing screw rod, the fixing plate is located on the limiting frame, a tensioning roller is arranged below the bottom ofthe adjusting plate, and the pressurizing screw rod is sleeved with the limiting plate. According to the yarn guiding device, yarns can be welled guided to prevent the yarns from breaking in the conveying process, the adjustment of the angle of the yarns can be conducted according to the conveying angle of the yarns, the using range of the guiding device is expanded, burrs, impurities and the likeon the yarns are removed through the burr removing mechanism to improve the quality of the yarns, and tensioning force in the yarn conveying process can be conducted by the adjusting assembly according to the conveying demands of the yarns to help the conveying of the yarns.

The invention discloses a disposable medical device destruction device and belongs to the technical field of medical devices. The disposable medical device destruction device comprises a box body, the bottom of the box body is fixedly connected with a supporting base, and the two sides of the top of the supporting base are fixedly connected with vibration reduction movement devices symmetrical to each other; the center of the top of the box body is fixedly connected with a feeding opening, the center of the top of the box body is provided with a through hole matched with the feeding opening, the two sides of the top of the box body inner wall are fixedly connected with first motor boxes symmetrical to each other, the opposite positions of one sides of the outer walls of the two first motor boxes are fixedly connected with a protection device, and the bottoms of one sides of the inner walls of the first motor boxes are fixedly connected with first motors through first motor fixing seats. By means of the disposable medical device destruction device, the problems that traditional medical device destruction equipment cannot meet daily requirements of hospitals and is not thorough in destruction, and medical waste is prone to returning to the market are solved, the purposes of thoroughly smashing and sterilizing the disposable medical devices are achieved, and secondary pollution is effectively prevented.

A method for preventing mechanical oscillation in a wind power plant includes determining wind speed, controlling a generator of the power plant with speed control when the wind speed is below a predefined limit to maintain the rotation speed of the generator below a predefined first limit, detecting the increase of wind speed above the predefined limit, controlling the electric drive of the wind power plant generator to torque control by using a predefined crossover torque in response to the wind speed increasing above a predefined limit, maintaining the crossover torque as the reference torque for the electric drive until the rotation speed of the generator has increased above a predefined second limit, and controlling the electric drive of the wind power plant generator with torque control while the rotation speed of the generator remains above the predefined second limit.

Provided are a large-current and highly stable gas field ionization ion source, and a high-resolution ion microscope with a large focal depth.The present invention relates to an ion microscope provided with a gas field ionization ion source, in which disposed are a refrigerator for cooling the gas field ionization ion source independent of the main body of the ion microscope, and a refrigerant circulation circuit cooling mechanism for circulating a refrigerant between the gas field ionization ion source and the refrigerator. Consequently it is possible to reduce the mechanical vibration of the refrigerator, which propagates to the gas field ionization ion source, and to achieve both the improvement of the brightness of the ion source and the improvement of ion beam focusing performance.

The invention discloses an electric hydraulic proportion twin rudder following and synchronous operation control system, which comprises an autopilot control system, a left rudder machine power / signal control box, a left rudder machine control box, a left rudder machine system, a left rudder angle signal feedback device as well as a right rudder machine power / signal control box, a right rudder machine control box, a right rudder machine system and a right rudder angle signal feedback device. The left rudder machine system and the right rudder machine system adopt a hydraulic rudder machine control system which uses a variable hydraulic pump and a proportional electromagnetic valve as a control core. In the left rudder machine system and the right rudder machine system, two hydraulic pumps drive two sets of oscillating oil cylinders to drive a tiller; the autopilot control system is a self-adaptive autopilot control system. The control system has the advantages that as the proportional valve and a variable pump are adopted for control, the mechanical shock of the device is reduced so as to be convenient for maintenance; since the use of the proportional valve and steering signals are continuously variable, the continuously stable startup and stop of the whole system are realized to effectively reduce the mechanical shock, thus not only protecting the mechanical system of the rudder machine, but also being beneficial to reducing the mechanical shock of the tail structure; furthermore, the use of the variable hydraulic pump and the proportional valve meets the requirements of various single-control indexes and the synchronous operation for steering the twin rudders.

The invention belongs to the technical field of physics and semiconductor measurement, and particularly relates to a two-dimensional magnetic field probe table measuring system. The measuring system comprises a base, a two-dimensional magnetic field electromagnet, an object table clamping plate arranged in the center of the magnetic pole of the electromagnet and fixed on the base, a probe table and a microscopic measuring device, wherein an opening is formed in the middle of the probe table, a plurality of direct-current and high-frequency probe seats and probes are arranged around the opening, the probes are in contact with samples on the object table clamping plate through the opening, and a plurality of direct-current and high-frequency instruments are connected with the probes to measure the samples in the magnetic field environment. According to the integrated and intelligent two-dimensional magnetic field probe table measuring system, the measurement function of the two-dimensional magnetic field probes can be realized; more probe seats and probes can be placed, so that relatively complex measurement in the magnetic field environment can be realized; the mechanical vibration is small, the flexibility is good, the cost performance is high, and the application scenes are wide.

An x-ray analyser for a transmission electron microscope is described. The analyser has a silicon drift detector moveable in use between an analysis position and a retracted position. The analyser has a housing having an end portion within which the silicon drift detector is retained. The end portion is formed from a material with a relative magnetic permeability of less than 1.004. The analyser also has an automatic retraction system adapted to move the silicon drift detector from the analysis position to the retracted position upon receipt of a trigger signal indicative of a condition in which the power level received by the silicon drift detector from impinging x-rays or electrons is above a predetermined threshold.

A slider assembly, comprising a slider having a magnetic head for reading and / or writing to a storage medium, and a vibration absorber operatively coupled to the slider for reducing mechanical vibrations of the slider caused by contact of the slider with the storage medium. The vibration absorber preferably includes a coupling portion coupled to the slider, and a weight coupled to the coupling portion by a resiliently deformable (e.g., flexible or elastic) member.