3results about How to "Meet engineering precision requirements" patented technology

This invention relates to the field of yield strength calculation technology, and in particular to a method for calculating the yield strength of 42CrMo steel used in engineering machinery. The method involves establishing a dimensionless model through data fitting between the yield strength Y1 and the quenching temperature X1, tempering temperature X2, and the mass percentage of Mn element X3: Y1 = 5479 - 2.81X1 - 4.643X2 + 889X3. This invention can accurately reflect the quantitative relationship between the heat treatment process parameters of 42CrMo steel, especially the tempering temperature and the yield strength, enabling the prediction of yield strength. This allows engineers to accurately predict the final properties of the material when formulating the heat treatment process, and to actively and accurately control the yield strength of the material by adjusting the process parameters.

The invention is suitable for the technical field of gas turbine modeling simulation, and provides a gas turbine starting process modeling method based on test run data, and the method comprises the steps: obtaining a measurement parameter of a target gas turbine starting process, and carrying out the segmented re-calibration processing of the measurement parameter according to a preset parameter of a preset gas turbine, and obtaining a calibration parameter; a Hammerstein model is established according to the calibration parameters; acquiring an initial time constant of the sensor model; based on the principle of aerodynamic thermodynamics, an iteration method is adopted to construct a part-level mechanism model of the target gas turbine slow, and the Hammerstein model and the part-level mechanism model are fused through a preset filter to obtain a target model; and optimizing the initial time constant of the sensor model and the preset time constant of the preset filter in the target model based on the actual test run data of the target gas turbine to obtain an optimization model.

The present invention provides a method for simulating an AC / DC bidirectional converter suitable for power flow simulation calculation, comprising the following steps: establishing a main circuit model, the main circuit model consisting of an unconnected DC circuit and an AC circuit; the DC circuit has two branches, one of which consists of a switch element K 1 , resistor element R , controlled DC voltage source U con The second branch is formed by the switch element K 2 , controlled DC current source I con The AC circuit has three branches, each containing a controlled AC current source. I a , controlled AC current source I b , controlled AC current source I c ; Establish a control system calculation unit to calculate each simulation step. The present invention simulates the complex electrical external characteristics of the AC / DC bidirectional converter by establishing a main circuit model and a control system calculation unit. There is no need to build a converter circuit containing a large number of power electronic devices, which not only meets the engineering accuracy requirements but also ensures the simulation speed.