A universal digital nozzle equivalent

Abstract

A universal digital spray pipe equivalent device comprises an input module, a logic control module, a calculation processing module and an output module. The calculation processing module comprises a time sequence sub-module, a triggering sub-module, a control sub-module, a storage sub-module and a calculation sub-module. According to the device, measured data of characteristic curves of a spray pipe are subjected to linear interpolation, the corresponding thrust percentage per millisecond is solved, the difference between adjacent data is calculated, and the values are multiplied by digital-to-analog (DA) equivalent and converted to binary numbers to be saved in a register of a field programmable gate array (FPGA). During the operation, corresponding binary numbers are taken out according to current output states of the spray pipe to be added up to a previous output value, and the sum is directly output to a DA converter, accordingly, output of characteristic curves of the spray pipe is achieved. By means of the device, the problem that prior spray pipe equivalent devices cannot simulate actual characteristics of spray pipes is solved.

Description

technical field [0001] The invention relates to a universal digital nozzle equivalent. Background technique [0002] In the development stage of various types of launch vehicle control systems, when there is no real nozzle in the simulation test, or the real nozzle may be severely damaged due to the test environment, in order to verify the correctness of the attitude control system design, generally adopt The nozzle equivalent implements the simulation of the characteristics of the physical nozzle, constitutes the closure of the system, and completes the simulation test content. [0003] The traditional implementation methods are: [0004] Analog nozzle equivalent: The characteristics of the nozzle on the test arrow are usually described by the transfer function of the first-order link and the pure delay link. In the design process, each link is built separately using analog circuit components, and then the links represented by these circuits are connected in series to sim...

AI Technical Summary

Problems solved by technology

The disadvantage of the analog nozzle equivalent device is that in order to simulate more realistic nozzle characteristics, it is very difficult and picky to choose resistors, capacitors and operational amplifiers during the design process.

When this type of nozzle equivalent device encounters a large difference between the actual characteristics of the nozzle and its mathematical model, or when a set of physical nozzle characteristic data generated by the test, its various characteristics cannot be immediately transferred by the transfer function Accurately described, this type of nozzle equivalent cannot successfully simulate the characteristics of the real nozzle

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