32results about How to "Simplified calculation procedure" patented technology

A method is provided for measuring an absolute steering angle Φ of a steering shaft for a vehicle, using a first rotatable body that rotates together with the steering shaft of the vehicle at a predetermined rotation ratio. The method includes obtaining a ΨM′ value by measuring a relative rotational angle Ψ′ of the first rotatable body using an angle sensor having a measurement range of Ω. The method also includes obtaining a present value for a frequency i-value of the first rotatable body by comparing the present ΨM′ value to a previous ΨM′ value. The method also includes obtaining a present value for a absolute steering angle Φ1 of the steering shaft from a present value for an absolute rotational angle Ψ of the first rotatable body by using the ΨM′ value and the present i-value.

An absolute steering angle of a steering shaft for a vehicle is measured using rotatable bodies that rotate together with the steering shaft at respective predetermined rotation ratios. A ΨM′ value is obtained by measuring a relative rotational angle Ψ′ of a first rotatable body and a θM′ value is obtained by measuring the relative rotational angle θ′ of a second rotatable body. θC's are obtained by calculating relative rotational angles θ's of the second rotatable body corresponding to the ΨM′ value, using the relation between Ψ′ and θ′. A frequency i-value of the first rotatable body is obtained by comparing the θCs to the θM′ value. An absolute steering angle Φ1 of the steering shaft is obtained based on the relation between absolute rotational angles Ψ and Φ, after Ψ is obtained using the i-value.

The invented identifier for recognizing the flow-pattern of gas-liquid two-phase flow includes microcomputer, photoelectricity isolation, bus, sensor, phase sensitivity demodulation unit, A / D converter and low pass filter, etc., these parts are connected in sequence. The invented method includes the following three steps: The three-dimension information of flow patterns is sampled in time interval. The sample information is composed. The characteristic data of the three-dimensional information are output. The target vectors are defined and each parameter of the neural network is determined. The emulation and comparing the target vectors are carried out so as to obtain the flow pattern.

Disclosed herein is an apparatus and method for calculating a TCP checksum. An apparatus for calculating a TCP checksum includes a data division unit for dividing content to be transmitted into two or more primary data fragments by a unit of a preset byte. A first checksum calculation unit calculates first checksums for the primary data fragments, respectively. A second checksum calculation unit calculates a second checksum for secondary data to be inserted into a data area of the TCP segment using the first checksums. Accordingly, in TCP-based networks, a checksum calculation procedure is improved upon transmitting static content, so that a static content transfer rate occupying most of TCP-based network traffic can be improved.

The invention belongs to the field of power systems, and in particular relates to a distance measuring method for an arc-light grounding fault of a power supply line. Most of the grounding faults of the power supply lines are arc grounding. After the faulty line is powered off, the DC current generator is used to charge the line to increase the voltage of the line to ground. When the fault breakdown voltage is reached, the fault point is broken down again. The high-resistance state quickly changes to a low-resistance state, the distributed capacitance of the line discharges through the breakdown point, and the voltage on the line drops sharply at the same time. The line is regarded as a dynamic system, the dynamic model of the line is established, and the dynamic system parameter identification method is used to identify the dynamic model parameters of the line according to the current and voltage sampling series on the line, and the fault distance is calculated according to the model parameters.

The invention relates to an implementation method for generating sine wave signals through a DSP controller. The implementation method includes the steps that firstly, parameters are set, the number N of sampling points in one sine wave signal cycle and the angle value theta of each sampling point are calculated, and a quintic polynomial approaching a sine function is worked out according to the projection theorem method in the optimization theory; then, the numerical value f0 of discrete points of the sine wave signals is calculated in real time according to different intervals where the sampling points n are located; then, the calculated numerical value f0 of the discrete points of the sine wave signals is sent into a DAC conversion circuit through the DSP controller, and continuous sine wave current signals are generated; finally, the continuous sine wave current signals are converted into continuous sine wave voltage signals through a UA operational amplifier, and thus output of the sine wave signals is achieved. By means of the implementation method, accumulative errors caused by continuous recursive calculation are reduced, the calculation procedure is simplified, the calculation time of the DSP controller is shortened, occupied storage space in the DSP controller is small, cost is lowered, waveform approximation is achieved, and precision is high.

The invention discloses a method for solving the unbalanced tension of a continuous overhead transmission line under single-end icing. Assuming a horizontal stress, the offset of the suspension insulator string is calculated by the step 1 to increase the span, and the step 2 is used to calculate each The offset of the suspension string of the gear, and then calculate the offset of the insulator string according to the stress of the overhead line in step 3, and repeat steps 1 to 3 to calculate all the parameters. If the calculated offset of the hanging string is close to 0, the requirements are met, and the above calculation results are accepted, otherwise, the horizontal stress is assumed again, and the calculation is restarted from step 1 until the calculated offset of the hanging string meets the accuracy requirements . The present invention proposes a calculation formula for the variation of the span of continuous stalls under single-end icing, and uses the "equal line method" model to solve the unbalanced tension after single-end icing, which can not only meet the requirements of engineering accuracy, but also form a simple and practical The calculation program is suitable for engineering actual calculation.

The invention relates to a breaker rigid opening point detecting method and system based on an opening pressure curve. The method comprises that 1) a pressure-time curve and a displacement-time curve in the opening process are obtained; 2) a minimum value of the pressure-time curve is calculated, and a moment tm corresponding to the position of the minimum value is recorded; and 3) the displacement-time curve is searched for a point Sm according to the corresponding moment tm, data {Sk-Sm} is processed, Sk serves as the initial value of the data, the speed corresponding to the data is calculated, and the position Sc where the speed is maximal serves as a practical rigid opening point. The method is scientific and effective, a calculation result is accurate, and the working state of a breaker can be monitored in real time.