Engine rotor inertia time measuring device

Abstract

The application relates to the technical field of an aero-engine ground test equipment, and discloses an engine rotor inertia time measuring device which comprises a rotating speed sensor, a filter module, a voltage stabilizing module, an operational amplifier module, a half-wave rectification module, a comparison circuit module, an optical coupling conversion module and a PLC controller; the measuring circuit is completed by using components such as operational amplifiers, comparators and optical couplings, the functions of filtering, amplifying and stop-rotation signal identification are realized, and the output signal is directly output to the PLC module of an engine test bench to realize parking time recording. The engine rotor inertia time measuring device is composed of low-cost mature products, is compatible with existing test bench equipment and engine equipment, and has a measurement precision meeting the demand; and the operation process of engine rotor parking inertia measurement is optimized, so that the dependence of engine rotor parking inertia measurement on manpower can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of ground test equipment technology for aero-engines, and discloses an engine rotor inertia time measurement device. Background Technology

[0002] Engine rotor inertia time is an important indicator for assessing the dynamic characteristics of an engine rotor system and is often used as a means of engine health monitoring. A certain turbofan engine is a dual-rotor turbofan engine, and currently, during testing, the shutdown inertia time of the high and low pressure compressors is monitored manually. Existing measurement methods are not suitable for current recording requirements. Summary of the Invention

[0003] The purpose of this invention is to provide an engine rotor inertia time measurement device with metrological accuracy requirements and an optimized operation process for engine rotor inertia measurement during shutdown, which can effectively reduce the reliance on human labor for engine rotor inertia measurement during shutdown.

[0004] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows: An engine rotor inertia time measurement device, comprising: A speed sensor is used to acquire engine rotor speed signals and convert the speed signals into voltage signals; The filtering module is used to receive voltage signals and filter them. The voltage regulator module includes a bidirectional clamping circuit composed of two Zener diodes, which is used to receive the filtered voltage signal and limit the filtered voltage signal to a preset clamping voltage range. The operational amplifier module is used to receive the voltage signal transmitted by the voltage regulator module and amplify it. The half-wave rectifier module is used to receive the signal output from the operational amplifier module and rectify it; The comparator circuit module is used to receive the rectified signal output from the half-wave rectifier module and output a preset level signal according to the magnitude of the rectified signal and the comparison voltage. The optocoupler conversion module is used to generate a fixed voltage value after receiving the level signal output by the comparator circuit module; A PLC controller is used to receive the fixed voltage value and record the duration of the fixed voltage value.

[0005] Furthermore, the filtering module is a low-pass filter with a cutoff frequency set to 10Hz.

[0006] Furthermore, the voltage regulator module achieves bidirectional clamping through two Zener diodes, with a preset clamping voltage range of ±3V.

[0007] Furthermore, the operational amplifier module is powered by ±5V and the gain is set to 50 times.

[0008] Furthermore, the comparison voltage value of the comparison circuit module is greater than or equal to 2.5V.

[0009] Furthermore, the optocoupler conversion module outputs a 24V signal to the PLC controller.

[0010] Furthermore, the PLC controller is configured to: start timing when the fixed voltage value is received, stop timing when the fixed voltage value interruption time exceeds 2 seconds, and calculate the time difference between the start and stop timing as the rotor stopping inertia time.

[0011] Furthermore, the speed sensor is a four-pole synchronous permanent magnet generator.

[0012] Compared with the prior art, the beneficial effects of this invention are: 1. The measurement circuit of this invention is completed using operational amplifiers, comparators, optocouplers and other components to achieve the functions of filtering, amplification and stop signal recognition. The output signal is directly output to the PLC module of the engine test bench to realize the recording of the stop time.

[0013] 2. All components of the engine rotor inertia time measurement device of the present invention are low-cost and mature products, compatible with existing test bench equipment and engine equipment, and the measurement accuracy meets the requirements; moreover, the operation process of engine rotor shutdown inertia measurement is optimized, which can effectively reduce the dependence on manpower for engine rotor shutdown inertia measurement. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the engine rotor inertia time measurement device in Example 1 or 2; Figure 2 This is a schematic diagram showing the connection relationship between the measurement circuit, the engine, and the PLC controller in Example 2; The components include: 1. Speed ​​sensor; 2. Filtering module; 3. Voltage regulator module; 4. Operational amplifier module; 5. Half-wave rectifier module; 6. Comparator circuit module; 7. Optocoupler conversion module; and 8. PLC controller. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0016] Example 1 See Figure 1 An engine rotor inertial time measurement device, comprising: Speed ​​sensor 1 is used to acquire engine rotor speed signal and convert the speed signal into a voltage signal; Filtering module 2 is used to receive voltage signals and filter them. The voltage regulator module 3 includes a bidirectional clamping circuit composed of two Zener diodes, which is used to receive the filtered voltage signal and limit the filtered voltage signal within a preset clamping voltage range. Operational amplifier module 4 is used to receive the voltage signal transmitted by voltage regulator module 3 and amplify it; The half-wave rectifier module 5 is used to receive the signal output from the operational amplifier module 4 and rectify it. The comparator circuit module 6 is used to receive the rectified signal output by the half-wave rectifier module 5, and output a preset level signal according to the magnitude of the rectified signal and the comparison voltage. The optocoupler conversion module 7 is used to generate a fixed voltage value after receiving the level signal output by the comparator circuit module 6; PLC controller 8 is used to receive the fixed voltage value and record the duration of the fixed voltage value.

[0017] In this embodiment, the speed sensor 1 accurately acquires the engine rotor speed signal and converts it into a voltage signal. The filtering module 2 efficiently filters the received voltage signal, effectively removing various interference noises and improving signal purity. The voltage stabilizing module 3, with its bidirectional clamping circuit, precisely limits the filtered voltage signal within a preset clamping voltage range, ensuring voltage stability. The operational amplifier module 4 has high-precision amplification capabilities, accurately amplifying the stabilized voltage signal to enhance signal strength for subsequent detection. The half-wave rectifier module 5 quickly and accurately rectifies the amplified signal, converting the AC signal into a DC signal, simplifying the signal format. The comparator circuit module 6 has high sensitivity and accuracy. The system receives rectified signals and outputs preset level signals stably based on their relationship with the comparison voltage. The optocoupler conversion module 7 quickly and reliably generates a fixed voltage value upon receiving the level signal, achieving signal isolation conversion. The PLC controller 8 possesses powerful data processing and recording functions, accurately receiving the fixed voltage value and recording its duration in detail, providing crucial data for inertial time measurement. All components of the engine rotor inertial time measurement device in this embodiment are low-cost, mature products, compatible with existing test bench equipment and engine equipment, and meet measurement accuracy requirements. Furthermore, the operation process for engine rotor shutdown inertial measurement has been optimized, effectively reducing the reliance on manual labor for engine rotor shutdown inertial measurement.

[0018] Example 2 See Figure 1 and Figure 2This embodiment takes the inertial time measurement device of the high-pressure compressor rotor and the low-pressure compressor rotor of a certain turbofan as an example to describe in detail the structure and working process of the engine rotor inertial time measurement device of the present invention.

[0019] Since the high-pressure compressor speed sensor 1 and the low-pressure compressor speed sensor 1 of the turbofan in this embodiment have the same model and operating speed, the detection circuit is completely identical. Speed ​​sensor 1 is a four-pole synchronous permanent magnet generator. According to the engine design, at 10% of the high-pressure compressor speed, the output of speed sensor 1 is approximately 2.27V, 7.6Hz; at 0.35% of the high-pressure compressor speed, the output of speed sensor 1 is approximately 80mV, 0.27Hz. Based on this requirement, the measurement circuit (including filter module 2, voltage regulator module 3, operational amplifier module 4, half-wave rectifier module 5, comparator circuit module 6, and optocoupler conversion module 7) is designed as follows: Figure 1 As shown, it includes: Speed ​​sensor 1 is used to acquire engine rotor speed signal and convert the speed signal into a voltage signal; Filtering module 2 is used to receive voltage signals and filter them. The voltage regulator module 3 includes a bidirectional clamping circuit composed of two Zener diodes, which is used to receive the filtered voltage signal and limit the filtered voltage signal within a preset clamping voltage range. Operational amplifier module 4 is used to receive the voltage signal transmitted by voltage regulator module 3 and amplify it; The half-wave rectifier module 5 is used to receive the signal output from the operational amplifier module 4 and rectify it. The comparator circuit module 6 is used to receive the rectified signal output by the half-wave rectifier module 5, and output a preset level signal according to the magnitude of the rectified signal and the comparison voltage. The optocoupler conversion module 7 is used to generate a fixed voltage value after receiving the level signal output by the comparator circuit module 6; PLC controller 8 is used to receive the fixed voltage value and record the duration of the fixed voltage value.

[0020] Figure 1 middle The speed sensor 1 outputs a signal. K1 is the measurement circuit switch, which is activated automatically or manually when the high-pressure rotor speed drops to 10%. After the signal is activated, it first passes through the low-pass filter circuit of filter module 2, with a cutoff frequency set to 10Hz. Then, it passes through a bidirectional clamping circuit composed of Zener diodes, with a clamping voltage of 3V. After that, the signal is input to an operational amplifier, designed with a gain of 50 times and a power supply of ±5V. The maximum output voltage is limited by the saturated output of the operational amplifier. When the compressor speed varies from 10% to 0.35%, the amplified signal becomes an AC signal of approximately 4.9V to 2.5V.

[0021] The signal is then introduced into a half-wave rectifier circuit and then into a comparator. R5 is an adjustable resistor. The output of the comparator circuit is controlled by adjusting R5 and R4. The design value is above 2.5V (which can be adjusted by R5) for the comparator circuit to output a signal. After the comparator circuit outputs a signal, it is converted into a 24V signal through an optocoupler and input to the existing PLC controller 8 on the test bench.

[0022] When the PLC controller 8 detects the 24V connection signal, it starts timing. Based on the output characteristics of a certain engine speed sensor 1, it is set to stop timing when the signal interruption time exceeds 2 seconds. The time difference between the start and stop is the rotor stopping inertia time.

[0023] Furthermore, the engine rotor inertia time measurement device in this embodiment needs to be calibrated before use and during routine inspections. The steps are as follows: First, calibration is performed. When the engine stops and the high-pressure rotor speed drops to 10%, the two measurement circuit switches are manually turned on simultaneously. At this time, the measurement circuit and the manual visual timing start synchronously. Then, based on the manual measurement results, the adjustable resistor R5 is adjusted to calibrate the automatic timing results. After calibration, the measurement circuit can be put into use on the test bench.

[0024] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An engine rotor inertia time measuring device, characterized in that, include: A speed sensor is used to acquire engine rotor speed signals and convert the speed signals into voltage signals; The filtering module is used to receive voltage signals and filter them. The voltage regulator module includes a bidirectional clamping circuit composed of two Zener diodes, which is used to receive the filtered voltage signal and limit the filtered voltage signal to a preset clamping voltage range. The operational amplifier module is used to receive the voltage signal transmitted by the voltage regulator module and amplify it. The half-wave rectifier module is used to receive the signal output from the operational amplifier module and rectify it; The comparator circuit module is used to receive the rectified signal output from the half-wave rectifier module and output a preset level signal according to the magnitude of the rectified signal and the comparison voltage. The optocoupler conversion module is used to generate a fixed voltage value after receiving the level signal output by the comparator circuit module; A PLC controller is used to receive the fixed voltage value and record the duration of the fixed voltage value.

2. The engine rotor inertia time measuring device according to claim 1, characterized in that, The filtering module is a low-pass filter with a cutoff frequency set to 10Hz.

3. The engine rotor inertia time measuring device according to claim 1, characterized in that, The voltage regulator module achieves bidirectional clamping through two Zener diodes, with a preset clamping voltage range of ±3V.

4. The engine rotor inertia time measuring device according to claim 1, characterized in that, The operational amplifier module is powered by ±5V and has a gain of 50.

5. The engine rotor inertia time measuring device according to claim 1, characterized in that, The comparison voltage value of the comparison circuit module is greater than or equal to 2.5V.

6. The engine rotor inertia time measuring device according to claim 1, characterized in that, The optocoupler conversion module outputs a 24V signal to the PLC controller.

7. The engine rotor inertia time measuring device according to claim 6, characterized in that, The PLC controller is configured to: start timing when the fixed voltage value is received, stop timing when the fixed voltage value interruption time exceeds 2 seconds, and calculate the time difference between the start and stop timing as the rotor stopping inertia time.

8. The engine rotor inertia time measuring device according to any one of claims 1-7, characterized in that, The speed sensor is a four-pole synchronous permanent magnet generator.

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