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DDS-based aero-engine rotation speed sensor simulation device and method

A speed sensor and aero-engine technology, applied in the direction of engine testing, measuring devices, instruments, etc., can solve the problems of different output impedance, difficult program control and system integration, flexibility, compatibility and poor impedance matching, and achieve device structure Simple, easy-to-operate effects

Inactive Publication Date: 2018-08-17
四川海特亚美航空技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of DDS-based aero-engine speed sensor simulation device, not only simple in structure, easy to operate, but also can overcome the amplitude that standard signal generator produces and real engine speed signal inconsistent; Output impedance and real sensor are generally different ;The flexibility, compatibility and impedance matching are poor, and there are disadvantages of difficult program control and system integration

Method used

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  • DDS-based aero-engine rotation speed sensor simulation device and method
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  • DDS-based aero-engine rotation speed sensor simulation device and method

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Embodiment 1

[0026] The DDS-based aeroengine speed sensor simulation device of the present embodiment, such as figure 1 and figure 2 Shown: Including industrial computer, used to give instructions on the number of revolutions; digital frequency synthesizer, used to generate the sinusoidal signal of the corresponding frequency from the number of revolutions; filter module, used to filter the sinusoidal signal to obtain the DC component Sinusoidal signal; amplitude amplification module, used to amplify the amplitude of the sinusoidal signal of the DC component to the required value; isolation and impedance matching module, used to isolate and match the amplitude-amplified signal and output it; the single-chip microcomputer control module is used for the digital The digital frequency synthesizer and the amplitude amplification module are controlled; the digital frequency synthesizer, the filter module, the amplitude amplification module, the isolation and the impedance matching module are co...

Embodiment 2

[0029] This embodiment is further optimized on the basis of embodiment 1, such as figure 2 Shown: the digital frequency synthesizer is chip AD9833. The chip AD9833 is used here as a digital frequency synthesizer because the core of the AD9833 is a 28-bit phase accumulator, which is composed of an adder and a phase register. Every time a clock comes, the phase register increases in steps, and the output of the phase register After being added with the phase control word, it is input to the address of the sine look-up table. The sine lookup table contains the digital amplitude information of a period sine wave, and each address corresponds to a phase point within the range of 0°-360° in the sine wave. The look-up table maps the input address phase information into a digital signal with a sine wave amplitude, and outputs an analog signal to the DAC. The phase register returns to the initial state after every 228 / M MCLK clocks, and the sine look-up table returns to the correspon...

Embodiment 3

[0033] This embodiment is further optimized on the basis of embodiment 2, such as figure 2 As shown: the filter module is mainly composed of a first filter capacitor and a second filter capacitor. Using two capacitors to form a filter module for filtering is simple and practical, and can effectively filter the sinusoidal signal out of the DC component.

[0034] The amplitude amplification module is mainly composed of the first operational amplifier, the second operational amplifier, the third operational amplifier, the fourth operational amplifier and chip DAC0832; the input terminal of the first operational amplifier is connected to the output of the chip AD9833 through the first filter capacitor end; the input end of the second operational amplifier is connected to the output end of the first operational amplifier, and the output end of the second operational amplifier is connected to the input end of the chip DAC0832 through the second filter capacitor; the input end of th...

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Abstract

The invention discloses a DDS-based aero-engine rotation speed sensor simulation device and method. The device comprises an industrial personal computer, a digital frequency synthesizer, a filter module, an amplitude amplification module, an isolation and impedance matching module and a single chip control module. The digital frequency synthesizer, the filter module, the amplitude amplification module and the isolation and impedance matching module are sequentially connected. The single chip control module is connected with the digital frequency synthesizer, the amplitude amplification moduleand the industrial personal computer. The invention further discloses the steps of the use method of the device. The device and method have the advantages of simple structure and convenient operation,and can overcome the disadvantages of inconsistency between amplitude generated by a standard signal generator and a real engine rotation speed signal, common difference between output impedance anda real sensor, poor flexibility, compatibility and impedance matching and difficult program control and system integration.

Description

technical field [0001] The invention relates to the field of test equipment or simulation, in particular to a DDS-based simulation device and method for an aeroengine rotational speed sensor. Background technique [0002] In the field of aero-engine control, the speed sensor is an important accessory for measuring the speed of the aero-engine. Its characteristic is that the frequency and amplitude of its signal increase with the increase of the engine speed. At present, when testing equipment or laboratory simulation, the signal is generated by a standard signal generator, and its amplitude is inconsistent with the real engine speed signal; in addition, the current electronic controller of the engine must detect the impedance of the speed sensor, but the standard signal generator The output impedance is generally different from the real sensor, and its flexibility, compatibility and impedance matching are poor, and there are disadvantages of difficult program control and sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P21/02G01M15/02
CPCG01M15/02G01P21/02
Inventor 杨志华杨正军杜明
Owner 四川海特亚美航空技术有限公司
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