Aero-engine dynamic test system, frequency-voltage transformation circuit and method
A voltage conversion circuit, aero-engine technology, applied in devices using electric/magnetic methods, measuring devices, linear/angular velocity measurement, etc., can solve problems such as inability to meet usage requirements, not too fast response speed, and reduced response speed. , to achieve the effect of improving actual test accuracy, improving performance and stability, and solving matching problems
Active Publication Date: 2016-06-01
CHINA AVIATION POWER MACHINE INST
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Problems solved by technology
[0005] In practical engineering applications, in order to improve the ripple characteristics of the output voltage at low speeds as much as possible, thereby improving the accuracy, a large filter capacitor is usually connected to the circuit, and the response speed will be greatly reduced in this way, which cannot meet the requirements of the application. Require
However, if the filter capacitor is reduced in order to improve the response speed, at low speeds, especially during the starting process of the aeroengine, the output voltage will fluctuate violently, resulting in complete unavailability, such as figure 2 Middle curve B
If you take care of one, you lose the other. In engineering, you can only compromise, while sacrificing part of the accuracy and part of the response speed, and complete the relevant tests with not too high precision and not too fast response speed.
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[0043] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details being omitted, or other methods, components, devices, steps, etc. may be adopted. In other instances, well-known technical solution...
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The invention discloses a high-speed frequency-voltage transformation circuit, comprising a phase lock frequency multiplication circuit, a frequency comparator, a filter amplifier, and a voltage-control oscillator. The phase lock frequency multiplication circuit is used for receiving frequency signals and converting the frequency signal to a first square wave signal; a frequency comparator is used for receiving first square wave signal outputted by the lock phase multiplication circuit and a second square wave signal outputted by the voltage control oscillator, comparing the frequency of the first square wave signal and the frequency of the second square wave signal, and outputting a first output signal according to the comparison result; the filter amplifier is coupled with the frequency comparator and the signal output terminal for processing the first output signal and outputting the processed first signal to the signal output terminal; the voltage control oscillator is coupled with the signal output terminal and is coupled with the filter amplifier and is used for receiving the first output signal which is processed by the filter amplifier and outputting the second square wave signal according to the first output signal. The invention can improve the practical testing accuracy of the dynamic testing system of the aero-engine in the low frequency terminal and in the fast changing process.
Description
technical field [0001] The present disclosure relates to the technical field of aero-engines, in particular, to a high-speed frequency-voltage conversion circuit, a high-speed frequency-voltage conversion method, and an aero-engine dynamic test system using the high-speed frequency-voltage conversion circuit. Background technique [0002] In the process of testing the test parameters of aero-engines and their components, the rotational speed is usually used as the abscissa. All parameter measurement techniques that take the rotational speed as the reference coordinate must first solve the problem of accurate measurement of the rotational speed. In the steady-state parameter test, the measurement of the speed can easily achieve the required accuracy by digital counting, but this method has a serious disadvantage, that is, the response speed is slow, the higher the required accuracy, the longer the calculation time, It cannot meet the requirements of the dynamic test process o...
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CPCG01P3/4802
Inventor姚峥嵘张塘卫倪立斌林柏生李峰
OwnerCHINA AVIATION POWER MACHINE INST