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69results about How to "Small time lag" patented technology

Method and system for managing an electrical load of a user facility based on locally measured conditions of an electricity supply grid

InactiveUS20130162215A1Little time lagEffective operational determinationComputer controlAc-dc network circuit arrangementsUser FacilityElectricity
The present invention relates to a method of managing the consumption and distribution of electricity in a user facility, wherein the user facility is connected to an electricity supply grid and the user facility comprises a grid connected on site generator; the method comprising the steps of measuring waveform conditions on a portion of the electricity supply grid adjacent the user facility to obtain locally measured waveform conditions; measuring electrical power readings from the on site generator; communicating the locally measured waveform conditions and the electrical power readings to a controller in the user facility; determining, at least on the basis of the locally measured waveform conditions, whether the electricity supply grid is oversupplied or undersupplied with electricity; and, modifying the flow of the electricity within the user facility based on whether the electricity supply grid is oversupplied or undersupplied with electricity and / or the electrical power readings from the grid connected on site generator.
Owner:COOPER TIMOTHY PATRICK

Digital camera

A digital camera having small time lag for recording the object after releasing a shutter by employing less movable parts, and by employing an image sensor for other purpose as well as actual forming picture image for recording the object is provided. According to one aspect of the present invention, a digital camera includes an image sensor having a plurality of two-dimensionally arranged pixels capable of selectively reading out signals from desired pixels and capable of adding signals of at least two pixels prior to getting the output from the image sensor, a first processor for processing outputs got from the individuals of the pixels of the image sensor to form a picture image of an object of the camera and a second processor for processing the added signal of the image sensor for light metering of the object. In the digital camera according to the present invention, by using an image sensor capable of selectively reading out signals from desired pixels and capable of adding signals prior to getting the output from the image sensor, signals from respective pixels are read out while processing picture image forming, and the output is got from the image sensor after signals from respective pixels within light-metering area are added while processing light metering. Accordingly, calculation for light metering can be processed quickly and a circuit for processing signals output from the image sensor can be simple. As a result, power savings as well as cost savings can be realized.
Owner:NIKON CORP

Boiler fly ash ignition carbon measuring device

The invention discloses a boiler fly ash ignition carbon measuring device, which comprises a sample feeding component, an ignition component, a transmission component, a sample weighing component, a sample discharge component and a crucible supporting plate. Crucible holes are arranged on the crucible supporting plate; the center of the crucible supporting plate is fixed to the top end of a pull rod passing through a station platform; a synchronizing wheel is arranged on the pull rod disposed between the crucible supporting plate and the station platform; a transposition motor fixed under the station platform is connected with the synchronizing wheel via a synchronizing belt; a sample feeding station, an ignition station, a sample weighing station and a sample discharge station are sequentially arranged on the station platform; the sample feeding component, the ignition component and the sample discharge component are respectively positioned above the sample feeding station, the ignition station and the sample discharge station; and the sample weighing component is positioned below the sample weighing station. By installing an electric scale below the station platform, the carbon measuring device enables the length of a weighing rod to be shortened heavily, enables the anti-vibration capability of the weighing rod to be strengthened greatly, and then improves measurement accuracy. Additionally, the crucible supporting plate is a strip-shaped plate with two through holes capable of holding a crucible, has simple structure, small rotation inertia, and is favorable for controlling accuracy of rotation.
Owner:南京大得科技有限公司

Error data identification method for secondary equipment in electric power supply system

The invention provides an error data identification method applicable to secondary equipment of a power supply system. The method comprises the following steps: if difference between two adjacent sampling values of the secondary equipment is greater than a preset threshold, then the current data are the error data, and the error data are discarded. The theory is as follows: firstly, as primary equipment of the power supply system has large inductance and capacitance, in the case of serious fault of the power supply system, the current value or voltage value of the power supply system does not suddenly changes but changes according to an exponential function curve; secondly, a mutual inductor of the primary system and an internal mutual inductor of the secondary equipment which are used for signal transformation have a maximum range limit, so the sampling value of the second equipment has a maximum value; and thirdly, if the sampled signal has frequency, the sampled signal has the frequency characteristics. The threshold of the permissible maximum sampling value difference can be set by integrating the three steps with the specific characteristics of the secondary equipment, such as amplitude corresponding to sampling point number and sampling conversion of each cycle.
Owner:NARI TECH CO LTD +1

Active anti-resonance vibration isolating device based on digital controller

InactiveCN101299156ADoes not affect pole-zero characteristicsEasy to adjustMechanical oscillations controlActuatorPiezoelectricity
An active anti-resonance vibration insulating device based on a digital controller is characterized in that the configuration is that one set of piezoelectricity acceleration sensor is provided on a vibration insulating platform. An actuator is provided between the vibration insulation platform and a base. The output end of the piezoelectricity acceleration sensor is connected with the digital controller. The output end of the digital controller is connected with the input end of the actuator which actuates under the controlling of the digital controller to apply force to the vibration insulating platform for generating a vibration insulating movement. The frequency of the movement is same with the frequency of the vibration from the base to the vibration insulating platform. The amplitude of the movement is same with the amplitude of the vibration from the base to the vibration insulating platform. The direction of the movement is opposite with that of the vibration from the base to the vibration insulating platform. The invention can simultaneously realize the anti-resonance vibration insulations of a plurality of frequencies.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI

Device and Method for Pressure Control of Electric Injection Molding Machine

{Problem}The exact method with small time-lag of detecting injection pressure for controlling pressure in an electric-motor driven injection molding machine without using a pressure detector has been asked for because the pressure detector is very expensive, necessitates troublesome works for mounting, an electric protection against noise and the works for zero-point and span adjustings and causes a complicate mechanical structure.{Solution}The present invention uses a high-gain observer which contains the discrete-time arithmetic expressions derived from a mathematical model of an injection and pressure application mechanism in an electric-motor driven injection molding machine consisting of a state equation and an output equation and outputs an estimate of injection pressure, which is one of the state variables of the above state equation, by using an injection velocity signal and a servomotor current demand signal or actual motor current signal as inputs. The high-gain observer obtains the exact injection pressure estimate with very small time-lag without using a pressure detector. Thus the estimate of injection pressure fed by the high-gain observer can be adopted as a feedback signal of actual injection pressure for controlling injection pressure.
Owner:AKASAKA NORIYUKI

Concrete spreading device and vibration elimination method, controller and device for arm frame thereof

The invention discloses a vibration elimination method for an arm frame of a concrete spreading device. The method comprises the steps: detecting a vibration direction signal and a vibration intensity signal of the tail end of the arm frame; and when the vibration intensity signal exceeds a vibration intensity threshold value, selectively controlling a hydraulic pump to communicate with a rod-end cavity or a cap-end cavity of an arm frame hydro-cylinder, adjusting a pump output pressure P1 according to the vibration direction signal, and maintaining the vibration signals within the range of a set threshold value by adjusting the pressure of the rod-end cavity or the cap-end cavity of the arm frame hydro-cylinder, and when the vibration intensity signal does not exceed the vibration intensity threshold value, control the hydraulic pump output to zero. By means of the technical scheme, the output pressure of the arm frame hydro-cylinder can be controlled according to the vibration of the arm frame. The vibration elimination method for the arm frame of the concrete spreading device takes corresponding control by detecting the vibrations of the arm frame, so that the detection is simple and convenient, the adjustment can be processed in real time, the control is direct and has low time delay, the control precision is high and the energy-saving effect is obvious.
Owner:ZOOMLION HEAVY IND CO LTD

Multi-objective robust control method for high-speed railway pantograph type current collector based on state estimation

InactiveCN110095984AReduce displacementReduce the mean square error of the velocityAdaptive controlControl orientedEngineering
The invention discloses a multi-objective robust control method for a high-speed railway pantograph type current collector based on state estimation. The multi-objective robust control method comprises the steps of: firstly, constructing a nonlinear pantograph type current collector-catenary model, and then constructing a control-oriented pantograph-catenary system model according to the nonlinearpantograph type current collector-catenary model to obtain a state-space equation under the pantograph-catenary system; secondly, determining a pantoraph active control target, and performing equation treatment on the control target; adding process noise and measured noise into the state-space equation according to the state-space equation under the pantograph-catenary system, so as to obtain anestimation-oriented discrete state equation; and finally, utilizing a space equation of the control target to design a multi-objective controller, and combining with an estimation result to obtain theoptimal active control force. The multi-objective robust control method studies the effectiveness and robustness of the control strategy in detail by means of the nonlinear pantograph-catenary model,and the control strategy still has good control performance under different operating conditions.
Owner:SOUTHWEST JIAOTONG UNIV

Self-powered rotary shaft vibration active control system and active control method

The invention discloses a self-powered rotary shaft vibration active control system and an active control method. In the self-powered rotary shaft vibration active control system, an inner housing isfixedly connected with a rotary shaft; a first end cover can be rotatably connected to the inner housing; a second end cover can be rotatably connected to the inner housing; the outer housing is fixedly connected to the first end cover and the second end cover; a permanent magnet is fixedly connected with the outer housing; a coil rack is fixedly mounted on the inner housing; a magnet exciting coil is wound on the coil rack, and generates relative motion with a permanent magnet to generate electric energy; an accelerated speed sensor is fixedly connected to the rotary shaft to measure a vibration signal of the rotary shaft in real time; an elastic element is fixedly connected to the rotary shaft; an actuator is fixedly connected to the elastic element, so that applied acting force acts onthe rotary shaft through the elastic element; the controller is electrically connected to the magnet exciting coil and the accelerated speed sensor; by responding to the vibration signal, the controller analyzes and processes the vibration signal to form a control signal; and by responding to the control signal, the actuator applies acting force on the rotary shaft through the elastic element to actively control radial vibration of the rotary shaft.
Owner:XI AN JIAOTONG UNIV

Gear-driven device

The invention relates to a gear-driven device which is a resultant-force device taking a plurality of small motors as power sources. The gear-driven device comprises a motor, driving gears and a driven gear; the motor and the driving gears are matched closely and provide power for the gear-driven device; two or more driving gears are arranged at the periphery of the driven gear and meshed with the driven gear respectively; the driving gears rotate synchronously and concertedly, so that the driven gear rotates, and the driving gears act on the driven gear jointly so as to drive the driven gear; and the driven gear is used to transfer force to the outside of the gear-driven device. The gear-driven device is a good power-driven device and can be used for the equipment needing to be provided with power.
Owner:SOUTHWEST UNIVERSITY
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