34results about How to "No complex calculations required" patented technology

The invention provides a current full compensation method and a system based on single-phase earth fault. When zero sequence voltage is not in a preset voltage value range, namely, the happened single-phase earth fault is instant ground connection, an arc extinction coil device with high flexibility in high-resistance ground connection can compensate ground connection capacitive current. When thezero sequence voltage is in the preset voltage value range, namely, the happened single-phase earth fault is not instant ground connection, a breaker in a fault phase transfer ground connection deviceconnected with a fault phase is turned off, fault current is converted into earth current, and a compensable compensation device is further utilized to output full compensation fault residual current. The fault current is converted into the earth current, the earth current can serve as tracking compensation signals of the compensable compensation device, and judgment reference is provided for a compensation effect of the compensable compensation device. In addition, the earth current can be determined by measurement; furthermore, measurement is convenient, and complex calculation is avoided;thus, compensation quickness and accuracy are ensured, compensation precision is improved, and fault points are shielded.

The invention discloses a turn-on angle control method for a switched reluctance motor, belonging to the technical field of angle control of switched reluctance motors. The invention provides an optimized control method for a turn-on angle based on characteristics of the switched reluctance motor. The method is realized by a position detection unit: a position level signal is generated by the position detection unit and then is encoded by a programmable logic device; and by using a microprocessor, actual rotate speed of the motor is calculated based on the position code, target current value required to conducting a phase winding by the switched reluctance motor is calculated by a PI algorithm, and angle position control is realized based on the target current value, an actual sampling current value and the actual rotate speed value by a special algorithm. The invention can realize automatic setting of the turn-on angle of the switched reluctance motor, improve control flexibility of the switched reluctance motor and simplify design of control program.

The invention discloses a multistage thermoelectric cooler parameter vacuum testing device which comprises a vacuum cavity, a vacuum pump, a water-cooling head, a temperature control cooling water circulation device, a heating resistor module, a cold-end temperature measurement resistor, a hot-end temperature measurement resistor, a direct current power source, and a data processing and displaying module. A vacuum pumping valve and an air vent valve are arranged on the vacuum cavity. The vacuum cavity is sealed with the water-cooling head through a vacuum rubber ring and connecting screws. A hot end of a thermoelectric cooler achieves heat dissipation and temperature control through the water-cooling head and the temperature control cooling water circulation device. The data processing and displaying module is used for carrying out real-time control, data processing and result displaying on appliances in the device. Through adoption of the multistage thermoelectric cooler parameter vacuum testing device, the current-voltage response relation and the current-refrigerating capacity relation of the multistage thermoelectric cooler, the refrigerating efficiency of the multistage thermoelectric cooler under different heat dissipation conditions and other parameters can be obtained. The multistage thermoelectric cooler parameter vacuum testing device is simple in structure, convenient to operate, high in measuring accuracy, and capable of effectively preventing a cold end of the thermoelectric cooler from dewing in the testing process of large temperature difference.

The invention relates to an automobile automatic clutch driving mechanism based on a volute compensation spring. Produced automatic clutch control systems are not formed in our country at the moment. The automatic clutch driving mechanism is an important component part of the automatic clutch control system. The automobile automatic clutch driving mechanism comprises a direct current driving motor arranged on a bracket and a self-locking worm and gear retarding mechanism connected with the clutch driving mechanism. A center driving shaft (13) arranged in a cylindrical steel barrel is connected with a worm wheel of the self-locking worm and gear retarding mechanism. The center driving shaft is respectively connected with a driving disc (1) and the inner end of a volute compensating spring (5). The driving disc is connected with a clutch inhaul cable (2). The outer end of the volute compensating spring is connected with a cylinder (11). The volute compensating spring is pre-tightened in advance before being arranged. The cylinder is internally provided with a mechanical position-limit mechanism (4), the volute compensating spring and a side angular position sensor (6). The automobile automatic clutch driving mechanism is applied to the automobile automatic control field.

The invention relates to the field of indoor positioning, in particular to a high-precision indoor positioning system based on a characteristic light source and a spherical lighting device and a corresponding method. The positioning described is three-dimensional space positioning. The system of the present invention includes three components: a characteristic light source, a spherical lighting device and a processor. The method of the present invention includes five steps of light source arrangement, information entry, site-selective lighting, feature matching and position calculation. Compared with the traditional indoor positioning system, the indoor positioning technology provided by the present invention has high precision, low cost, good real-time performance, and excellent scalability and portability.

The invention discloses an air conditioner, a variable-frequency speed regulation system and a control method thereof. The control method includes the steps of: detecting a three-phase current of a motor; estimating the position and the speed of a rotor of the motor to obtain an estimated angle and an estimated speed of the rotor; according to an input ramp signal, performing position correction on the estimated angle to obtain a given speed, performing differential calculation on the ramp signal, and superposing a calculation result to the given speed to obtain a target speed; according to the target speed, performing speed correction on the estimated speed to obtain a quadrature axis target current; and performing coordinate transformation on the three-phase current to obtain a direct axis current and a quadrature axis current, performing current correction on the direct axis current Id and the quadrature axis current Iq according to the direct axis target current and the quadrature axis current Iqref to obtain a direct axis voltage Vd and a quadrature axis voltage Vq, and controlling the motor according to the direct axis voltage Vd and the quadrature axis voltage Vq. The control method provided by the invention can improve speed regulation performance, and improve an energy-saving effect.

The invention discloses a method for measuring the moisture content of sandstone based on an interdigital capacitor. The method is rapid in detection, high in measurement precision, accurate in measurement data and low in cost. The method comprises the following steps: S1, respectively putting a plurality of groups of standard sandstone samples with different preset moisture contents into a capacitance device and taking the standard sandstone samples as a capacitance medium, and sequentially measuring capacitance values of the capacitance device corresponding to the standard sandstone samples with different moisture contents; S2, establishing a mathematical model of the capacitance value and the moisture content according to the capacitance value measured in the step S1, and obtaining a relational expression of the capacitance value and the moisture content; S3, putting the to-be-measured sandstone into the capacitance device to serve as a capacitance medium, and measuring the capacitance value of the capacitance device corresponding to the to-be-measured sandstone; and S4, substituting the capacitance value measured in the step S3 into the relational expression of the capacitance value and the water content to calculate the water content of the sandstone to be measured. The method is suitable for measuring the water content of the sandstone.

The invention discloses an image acquisition device and an image acquisition device-based facial identity verification method. The image acquisition device comprises a lens, a light splitting component, an infrared image sensor and a visible image sensor, wherein the lens is used for obtaining an imaging light ray; the light splitting component is arranged behind the lens and is used for splittingthe light ray from the lens into a first beam of light ray and a second beam of light ray; the infrared image sensor is used for forming an infrared image on the basis of the first beam of light rayfrom the light splitting component; the visible image sensor is used for forming a visible image on the basis of the second beam of light ray from the light splitting component; and the infrared imagesensor and the visible image sensor are arranged behind the light splitting component in parallel and relatively fixed in the aspect of position. According to the image acquisition device, the process of judging whether the infrared image and the visible image belong to a same person is omitted. The facial identity verification method has similar advantages.

The invention relates to an SAR image overlay area positioning method based on a space geometry ratio relation. The method comprises the following steps: firstly, acquiring SAR data and DEM data of a corresponding region; acquiring an image incident angle according to an xml file attached to the SAR image; reading an RPC parameter file, and constructing a rational function model RFM of the satellite-borne SAR image; geodetic coordinates corresponding to the coordinates of the image points at the four corners of the SAR image are determined, and a minimum enclosing rectangle formed by the geodetic coordinates is obtained; cutting the DEM data according to the minimum bounding rectangle, and re-sampling the DEM data; determining a ratio relation threshold value of the number of the object space pixels and the number of the image space pixels when overlay occurs; on the basis of object space partitioning of the resampling DEM data, a mask of each object space sub-block is calculated in a multi-thread parallel mode, and the masks are combined and subjected to post-processing to generate a final overlay mask. The method provided by the invention can be used for quickly generating the SAR overlay mask, and provides technical guarantee for further application of SAR images.

The invention discloses a power transmission line sag measurement method based on an unmanned aerial vehicle laser point cloud model. The method comprises the following steps that two cable towers needing to be measured are determined; performing three-dimensional laser scanning on the two towers and the power transmission line between the two towers by using an unmanned aerial vehicle carrying a three-dimensional laser point cloud scanner to obtain corresponding point cloud data; performing three-dimensional reconstruction by using the point cloud data to obtain a power transmission line model; importing the power transmission line model into a geometric drawing board for analysis, taking a hanging point of a tower at one end as an original point, establishing a coordinate system, measuring an abscissa of another upper hanging point, selecting a span midpoint, and measuring the size of a sag; the horizontal span L, the length D of the horizontal and vertical coordinates of the hanging points of the two towers and the sag length H on the geometric drawing board can be measured from the geometric drawing board, and the actual sag length f is equal to L * H/D. The method has the advantages that sag measurement accuracy is improved, measurement is convenient, complex calculation is not needed, and the intelligent level of a power transmission line is improved.

The invention discloses an accurate pipeline elbow stress calculation method. The method comprises the steps: 1, calculating an elbow stress increase coefficient under the influence of pipeline displacement; 2, calculating an elbow stress increase coefficient iF under the influence of an external load; 3, synthesizing the two parts of stress increase coefficients to obtain a total stress increasecoefficient i1; and 4, calculating the accurate stress at the elbow; According to the method, the stress of the pipeline elbow can be efficiently and accurately calculated, so that the stress analysisresult of the elbow is more accurate and reliable. The introduction of the accurate stress increase coefficient can effectively reduce the error between the calculated value and the true value of thestress of the pipeline elbow, thereby improving the credibility of the strength and fatigue analysis result.