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33results about How to "Fast steady state" patented technology

Method and device for suppressing residual oscillation of cantilever crane

The invention provides a method and a device for suppressing residual oscillation of a cantilever crane, which are applied to an engineering machine. The engineering machine comprises the cantilever crane and an actuating mechanism for controlling the movement of the cantilever crane. The method comprises the following steps of acquiring indication information reflecting the oscillation amplitude of the cantilever crane; determining the oscillation situation of the cantilever crane according to the variation trend of the indication information, wherein the oscillation situation comprises the oscillation direction of the cantilever crane; controlling the actuating mechanism to apply the interference force for reducing the oscillating amplitude of the cantilever crane onto the cantilever crane in the current oscillation direction of the cantilever crane according to the oscillation situation under the situation that the cantilever crane stops movement and the residual oscillation of the cantilever crane is started. By utilizing the technical scheme, the technical problems in the prior art that the time for stabilizing the cantilever crane is long, the residual oscillation amplitude is large and the like can be solved, so that the cantilever crane can be rapidly stabilized after the variable-amplitude movement is stopped, and the working efficiency is improved.
Owner:ZOOMLION HEAVY IND CO LTD

Device and method for correcting power factor

The invention discloses a device and method for correcting a power factor. The device comprises a main power factor correcting circuit and a sliding mode variable structure controller. The sliding mode variable structure controller comprises a signal collecting module, a bandwidth adjusting module and a hysteresis comparator. The bandwidth adjusting module is used for receiving input voltage and buffering capacitor voltage of the main power factor correcting circuit and outputting a bandwidth, and the output bandwidth is changed along with the changes of the input voltage to change the frequency of a switch tube of the main power factor correcting circuit. The signal collecting module is used for collecting the feedback voltage of an output signal of the main power factor correcting circuit. The hysteresis comparator is used for producing a sliding mode signal track according to the comparison result between the feedback voltage collected by the signal collecting module and the given reference voltage, the sliding mode signal track is compared with the bandwidth, a periodical control signal is produced, and the duty ratio of the main power factor correcting circuit is adjusted through the control signal to change the output voltage of the main power factor correcting circuit.
Owner:WUHAN UNIV OF TECH

A new solar panel deployment and support mechanism based on ribbon springs

InactiveCN103482084BImprove reliabilityMeet fundamental frequency requirementsPhotovoltaic supportsCosmonautic vehiclesBand shapeCoil spring
A novel band-spring-based solar sailboard unfolding and supporting mechanism belongs to the field of unfolding mechanisms applied to satellite solar battery arrays and aims to solve the problems of low unfolding rigidity and low base frequency in the prior art. The mechanism comprises a solar sailboard, coil-spring driving hinges, a satellite body, strut hinges, a lower strut, a band spring and an upper strut; the solar sailboard and the satellite body are connected by the coil-spring driving hinges, two ends of the band spring are respectively connected with the upper and lower struts by adapters, the upper strut is connected with the solar sailboard by one strut hinge, and the lower strut is connected with the satellite body by the other strut hinge; coil springs in the coil-spring driving hinges, the band spring and the strut hinges provide unfolding moment so as to realize the unfolding of the solar sailboard. According to the novel band-spring-based solar sailboard unfolding and supporting mechanism, the solar sailboard, the satellite body and the upper and lower struts form a whole to constitute a stable supporting structure shaped like a spacial tetrahedron, so that the base frequency and the rigidity of a system under an unfolding state are improved.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI

Method and device for suppressing residual vibration of boom

The invention provides a method and a device for suppressing residual oscillation of a cantilever crane, which are applied to an engineering machine. The engineering machine comprises the cantilever crane and an actuating mechanism for controlling the movement of the cantilever crane. The method comprises the following steps of acquiring indication information reflecting the oscillation amplitude of the cantilever crane; determining the oscillation situation of the cantilever crane according to the variation trend of the indication information, wherein the oscillation situation comprises the oscillation direction of the cantilever crane; controlling the actuating mechanism to apply the interference force for reducing the oscillating amplitude of the cantilever crane onto the cantilever crane in the current oscillation direction of the cantilever crane according to the oscillation situation under the situation that the cantilever crane stops movement and the residual oscillation of the cantilever crane is started. By utilizing the technical scheme, the technical problems in the prior art that the time for stabilizing the cantilever crane is long, the residual oscillation amplitude is large and the like can be solved, so that the cantilever crane can be rapidly stabilized after the variable-amplitude movement is stopped, and the working efficiency is improved.
Owner:ZOOMLION HEAVY IND CO LTD

Automatic gain control method and device for CVBS (Composite Video Broadcast Signal)

The invention discloses an automatic gain control method and device for a CVBS (Composite Video Broadcast Signal). The method comprises the steps of receiving a CVBS, and performing translation to obtain a translation signal of which the back porch is a 0-based signed number; multiplying the translation signal by an automatic gain value to obtain an amplified signal; solving the feature level of the amplified signal, acquiring a synchronous gain value and a peak gain value, performing filtration and amplitude limitation on the smaller value to obtain the automatic gain value, returning to the front step, and multiplying the translation signal by the automatic gain value. The acquired automatic gain value is more accurate by solving the feature level of the CVBS, and the method and the device is not only suitable for automatic gain control of normal CVBS but also suitable for automatic gain control of nonstandard signals, so that the overall watching effect of images is not influenced. In addition, automatic gain adjustment is quickly performed in view of the initial state during startup or plug-unplug of the system, so that images can reach the stable state more quickly, and long-time white or dark images do not appear.
Owner:ARKMICRO TECH

Coal quantity instruction optimization method for supercritical frequency modulation and peak regulation thermal power generating unit

The invention relates to the technical field of thermal power generating unit coal quantity instruction optimization methods, and concretely relates to a coal quantity instruction optimization method for a supercritical frequency modulation and peak regulation thermal power generating unit. Adynamic coal quantity instruction is obtained according to the following method: when k is less than or equal to 1, a dynamic coal quantity instruction D2 is a pulse coal quantity instruction g plus a coal quantity instruction c; and when k is greater than 1, the dynamic coal quantity instruction D2 is the sum of the trapezoidal coal quantity instruction and the coal quantity instruction c. According to the dynamic coal quantity instructions obtained through the optimization method, when k is smaller than or equal to 1, the pre-coaling instruction is a pulse coal quantity instruction g, when k is larger than 1, the pre-coaling instruction is a trapezoidal coal quantity instruction, the step amount of the pre-coaling instruction is reduced, the coal quantity instruction of the frequency modulation and peak regulation thermal power generating unit reaches a target value in an optimal mode, and the unit can quickly enter a stable state.
Owner:ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER +2

A drying room of a rotary screen printing machine

ActiveCN104723669BPromote natural ventilationFast steady statePrinting press partsScreen printingConduction band
The invention discloses a drying room of a circular screen printer. The drying room of the circular screen printer comprises draught fans, heat sources, a conduction band, a conduction band roller, cloth press rollers, an air outlet and a baffle, wherein the area of the drying room is divided into an upper area, a middle area and a lower area by fabric and the baffle; the drought fans are of three different types, the number of the drought fan of the largest type is three, and the drought fans of the largest type have an air blowing function and are located in the area formed by the fabric and the upper portion of the drying room, the number of the drought fans of the middle type is three, the drought fans of the middle type have an air suction function and are located in the area formed by the baffle and the lower portion of the drying room, the number of the drought fans of the smallest type is two, and the drought fans of the smallest type have the air suction function and are located in the area formed by the baffle and the fabric; the number of the heat sources is three, the heat sources are fixedly hung on the room top of the drying room through small metal bars, and the positions of the heat sources correspond to three air blowers; the combination body of the conduction band and the conduction band roller is arranged in an inclined direction and forms a 30-degree angle with the horizontal plane, the number of the cloth press rollers is three, and the cloth press rollers are located on the downstream in the running direction of the fabric; the baffle is connected with the front face and the back face of the drying room, and gaps are formed between the baffle and the left face and the right face of the drying room; and the air outlet is communicated with an fabric outlet.
Owner:黄红兵
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