3results about How to "Analysis method is simple" patented technology

The application provides a converter valve area short-circuit fault positioning method, device, equipment and medium, the method comprises the following steps: dividing the converter valve fault into eight typical valve area short-circuit faults; RTDS simulation analysis, according to the different converter protection action results, dividing into three types of protection actions, giving the typical fault characteristic quantity of the valve difference protection action for positioning the valve area fault and the eight typical valve area short-circuit quick criterion; according to whether the actual converter protection action occurs in the rectifying station or the inverting station, confirming the valve area short-circuit fault occurring station; according to the converter protection action event of the monitoring background, confirming the converter protection action type and the valve area fault converter bridge; calling the built-in fault recording of the DC control protection, analyzing the converter protection action waveform, analyzing the fault characteristics of the current waveform of the valve side of the converter bridge and the outlet current waveform of the DC side, positioning the valve area short-circuit fault point according to the typical fault characteristic quantity of the valve difference protection action and the eight typical valve area short-circuit quick criterion; and has the advantages of fast positioning speed and simple analysis method.

The utility model relates to the field of aircraft body structures, and provides a truss type aircraft cargo hold floor structure and an aircraft, the cargo hold floor structure comprises a fuselage frame, a truss, a floor cross beam, fuselage frame connecting nodes, floor cross beam connecting nodes and a floor; the floor beams are arranged on the upper portion of the machine body frame, and the two ends of each floor beam are fixedly connected with the machine body frame. The truss comprises a plurality of stand columns, one ends of the stand columns are connected with the fuselage frame through fuselage frame connecting nodes, and the other ends of the stand columns are connected with the floor cross beams through floor cross beam connecting nodes. The stand columns can rotate around the fuselage frame connecting joints or the floor beam connecting joints. A triangular structure is formed between every two adjacent stand columns and the machine body frame or the floor beam. According to the utility model, the assembly process is simplified, and the production efficiency is improved. And the connecting rotating shafts are adopted at the connecting positions of the truss, the fuselage frame and the floor cross beam, so that the connecting positions only transmit tension and compression loads, and the situation that the positions are insufficient in connection due to large bending moment of the bottom frame is avoided.

The invention relates to the technical field of chemical detection, in particular to a method for analyzing sample components containing one or more of 1, 4-cyclohexanedimethanol, dimethyl 1, 4-cyclohexanedicarboxylate and dimethyl terephthalate. The analysis method comprises the following steps: sample pretreatment: pretreating a sample to obtain a liquid without mechanical impurities as a sample to be detected; determining and analyzing a to-be-detected sample: injecting the to-be-detected sample into a gas chromatograph for detection, and determining the nature by using an external standard method; the detection conditions are as follows: the detector is FID, and the temperature of the FID is 295-320 DEG C. The analysis method disclosed by the invention is simple, good in reproducibility, high in sensitivity, good in stability, simple to operate and high in analysis speed, can meet the analysis requirements of 1, 4-cyclohexanedimethanol, raw materials thereof and raw material hydrogenation products or samples containing or partially containing similar components, and omits the tedious operation of selecting and adding internal standard substances.