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99results about How to "Increase system complexity" patented technology

Method and system for accumulating energy by compressed air and heat accumulation medium simultaneously

The invention relates to a method and a system for accumulating energy by compressed air and heat accumulation medium simultaneously, and belongs to the field of compressed air energy accumulating. The system comprises a motor, an air compressor, an air storage device, a heat accumulation tin, a turbine and an electric generator. The system comprises the following principles: solid heat accumulation medium and electrical heating elements are arranged in the heat accumulation tin; when the system is charged in off-peak hour period, air is compressed by the air compressor and exchanges heat with the solid heat accumulation medium in the heat accumulation tin; the heat exchanged air is stored in the air accumulation device; the heat exchanged solid heat accumulation medium is heated continuously by using the electrical heating elements; when the system discharges in peak hour period, the accumulated air is released, and enters the turbine to work after absorbing the heat from the solid heat accumulation medium; and the electric generator is driven by the turbine to generate electricity. Compared with the conventional adiabatic compression air energy accumulating system, the system has the advantages that the memory capacity is greatly increased; the unit capacity investment cost is reduced; the system only needs to adopt a one-stage heat accumulation tin and a one-stage turbine; and the system complex degree is low.
Owner:TSINGHUA UNIV

Identification method of woven fabric tissue chart

The invention provides an identification method of a woven fabric tissue chart, wherein the identification method relates to image analysis. The identification method comprises the steps of a first step, identifying the type of the woven fabric tissue structure based on a yarn boundary characteristic, namely performing woven fabric image pre-treatment, performing inclination correction and dividing for obtaining each tissue point image, determining the latitude and longitude attributes of the tissue point image by means of the yarn boundary characteristic of the tissue point image, obtaining the number of circulating yarns of the woven fabric and classifying the tissue structure; and a second step, performing woven fabric tissue chart identification based on an improved Gabor characteristic and the tissue structure type, namely extracting the characteristic of a non-twill tissue point image based on the improved Gabor kernel transformation, performing PCA dimension reduction, classifying the non-twill tissue point image by means of a support vector machine, performing classified correction on a woven fabric tissue chart matrix, and outputting a correct woven fabric tissue chart. The identification method of the woven fabric tissue chart can realize a high-robustness identification effect on woven fabric three-elementary tissues which are obtained through weaving yarns with different dimensions and colors and the woven fabric tissue chart with a simple changed tissue structure.
Owner:HEBEI UNIV OF TECH

Diagnosis method considering fault of inverter current sensor and open-circuit fault of power tube

The invention discloses a diagnosis method considering a fault of an inverter current sensor and an open-circuit fault of a power tube. The method comprises the steps of acquiring a signal for diagnosis from an inverter; calculating an expected value and an actual value of a line voltage between bridge arms; calculating a deviation value of the line voltage between the bridge arms to serve as a first diagnosis variable; calculating a deviation value of a sum of inductive currents to serve as a second diagnosis variable; setting a threshold value of the first diagnosis variable; setting a threshold value of the second diagnosis variable; calculating the polarity of the first diagnosis variable and the polarity of the second diagnosis variable, and then comprehensively diagnosing the fault of the inverter current sensor and the open-circuit fault of the power tube according to a fault diagnosis table; and if the fault of the current sensor of a certain phase is diagnosed, performing fault tolerance of the current sensor. The diagnosis method provided by the invention has comprehensiveness, quickness and robustness, does not need extra hardware circuit, can be suitable for inverter systems of different control methods, and is low in sampling frequency and small in calculation amount.
Owner:ZHEJIANG UNIV
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