A rocket engine test equivalent device test system and test method thereof

Abstract

The present invention relates to a liquid rocket engine ground test technology, and specifically to a rocket engine test equivalent device test system and a test method thereof. The present invention solves the technical problem that there is no direct measuring instrument for measuring the electrical performance parameters of the control loop of the existing rocket engine ground control system, making it difficult to ensure the measurement accuracy. The equivalent device test system of the present invention includes an equivalent device and an equivalent device tester; the equivalent device includes a multi-channel equivalent electric squib resistor and a multi-channel equivalent solenoid valve resistor; the equivalent device tester includes a current acquisition and conditioning unit, an ARM+FPGA processing unit, a monitoring unit and four external connectors; the current acquisition and conditioning unit includes a current sensor, a conditioning circuit and a synchronous ADC chip; the current acquisition and conditioning unit converts the current signal into an isolated voltage signal after conditioning, and the synchronous ADC chip processes the isolated voltage signal and transmits it to the ARM+FPGA processing unit; the ARM+FPGA processing unit is used to communicate data and instructions with the monitoring host.

Description

Technical Field

[0001] The invention relates to a liquid rocket engine ground test technology, and in particular to a rocket engine test equivalent device test system and a test method thereof. Background Art

[0002] In the ground test of liquid rocket engines, it is necessary to detect the electrical performance parameters of the ground control system control circuit before docking the engine. The electrical performance parameters of the ground control circuit mainly include the working current of the electric squib circuit, the load terminal voltage of the electric squib, the working current of the solenoid valve circuit, and the load terminal voltage of the solenoid valve. At present, the working current and load terminal voltage are mainly calculated based on the power supply voltage, circuit line resistance, and load resistance. Without direct measurement instruments, it is difficult to ensure the measurement accuracy. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problem that the electrical performance parameter measurement of the control loop of the existing rocket engine ground control system is mainly calculated based on the power supply voltage, loop line resistance, and load resistance, and there is no direct measuring instrument, which makes it difficult to ensure the measurement accuracy. A rocket engine test equivalent device test system and a test method thereof are provided.

[0004] In order to ensure the safety and accuracy of the rocket engine ground test, it is necessary to test the working electrical performance parameters of the control loop before the ground control system is connected to the engine, so as to ensure the matching of the ground control system with the control object on the engine. The concept of the present invention is to use 24 equivalent electric squib resistors and 24 equivalent solenoid valve resistors of the equivalent device to simulate the control object on the engine for test testing, connect the ground control system to the equivalent device system for testing, and the equivalent device system directly collects and stores and analyzes the electrical performance parameters of the control loop test, which can effectively ensure the safety of the engine and the operability of the test. The equivalent device tester directly collects loop excitation from the equivalent device, processes and analyzes the collected signals, detects the excitation current of the control loop, and displays the channel current and voltage of the control loop through the touch screen, so as to judge the correctness of the electrical performance parameters of the control loop, and ensure the measurement accuracy of the electrical performance parameters. The convenience and safety of the control loop electrical performance parameter test of the engine ground control system are improved.

[0005] The technical solution of the present invention is:

[0006] A rocket engine test equivalent device test system, which is special in that it includes an equivalent device and an equivalent device tester;

[0007] The equivalent device includes a multi-channel equivalent electric squib resistor, a multi-channel equivalent solenoid valve resistor, an equivalent electric squib connector, and an equivalent solenoid valve connector;

[0008] The equivalent electric squib connector and the equivalent solenoid valve connector are both provided with a plurality of connection points;

[0009] The two ends of the multi-channel equivalent electric squib resistor are respectively connected to the connection points on the equivalent electric squib connector in a one-to-one correspondence;

[0010] The two ends of the multi-channel equivalent solenoid valve resistor are respectively connected to the connection points on the equivalent solenoid valve connector in a one-to-one correspondence;

[0011] The equivalent device tester includes a current acquisition and conditioning unit, an ARM+FPGA processing unit, a monitoring unit and four external connectors; the four external connectors include a first electric squib connector, a first solenoid valve connector, a second electric squib connector and a second solenoid valve connector;

[0012] The equivalent electric squib connector and the equivalent solenoid valve connector are respectively connected to the first electric squib connector and the first solenoid valve connector of the equivalent device tester;

[0013] The second electric squib connector and the second solenoid valve connector of the equivalent device tester are respectively connected to the aviation plug interface of the external control system;

[0014] The equivalent device tester is used to receive the excitation signal transmitted by the external control system, transmit the excitation signal to the equivalent device, detect the loop current signal after the excitation responded by the equivalent device, calculate the load terminal voltage through the current, and thus determine the correctness of the control channel voltage, control timing and working current of the control loop;

[0015] The current acquisition and conditioning unit includes a current sensor, a conditioning circuit and a synchronous ADC chip;

[0016] The current sensor is used to collect the loop current signal after the excitation of the equivalent device response and transmit the collected loop current signal to the conditioning circuit;

[0017] The conditioning circuit is used to convert the loop current signal into an isolated voltage signal and send it to the synchronous ADC chip;

[0018] The synchronous ADC chip is used to sample and process the isolated voltage signal and transmit the sampled signal to the ARM+FPGA processing unit;

[0019] The ARM+FPGA processing unit is used to receive the sampled data and transmit the data to the monitoring unit, communicate data and instructions with the monitoring unit, receive instructions from the monitoring unit, and switch the channel for collecting signals;

[0020] The monitoring unit includes a CPU processor and a touch display screen;

[0021] The CPU processor is used to exchange data and instructions with the ARM processor, send instructions to the ARM processor, and obtain sampling data of the ARM processor in real time;

[0022] The interface of the touch screen includes a display interface and a control interface, which are used to display the collected data in real time through the display interface and to control the test through the control interface.

[0023] Furthermore, the monitoring unit also includes a remote monitoring host; the remote monitoring host establishes a network connection with the CPU processor via Ethernet; and exchanges data and instructions with the CPU processor via TCP protocol.

[0024] Furthermore, the isolation voltage signal is 0-10V.

[0025] Furthermore, the equivalent squib resistor and the equivalent solenoid valve resistor are both 24 resistors.

[0026] Furthermore, the panel of the equivalent tester is provided with 48 LED indicator lights for displaying the on / off status of corresponding electric squibs or solenoid valve channels.

[0027] Furthermore, the resistance of the equivalent electric squib resistor is 1Ω;

[0028] The resistance value of the equivalent solenoid valve resistor is 30Ω.

[0029] A test method for a rocket engine test equivalent device test system, which is special in that it includes the following steps:

[0030] Step 1) setting the equivalent solenoid valve resistance channel to be tested, the equivalent electric squib resistance channel, the storage location of the data, and the opening voltage, closing voltage and access resistance value of each channel on the software display interface of the monitoring host;

[0031] Step 2) Select the timing diagram interface in the switching interface of the display interface, and select voltage display or current display;

[0032] Step 3) After connecting the control system to the equivalent device tester, the equivalent squib resistance and the equivalent solenoid valve resistance channel are excited and given according to a predetermined timing sequence. The equivalent device tester controls data acquisition, data storage and data playback through buttons on the control interface of the monitoring host, receives data transmitted in the ARM and analyzes and processes the received data;

[0033] Step 4) The collected data is displayed in the interface as a timing diagram of the state change of the corresponding channel, as well as the voltage value or current value.

[0034] The beneficial effects of the present invention are:

[0035] 1. The present invention uses an equivalent device to simulate the real electric squib and solenoid valve on the equivalent engine, avoiding directly controlling the object on the engine to perform the electrical performance test of the ground control loop. Using the equivalent device for the test can improve the safety and convenience of the test. At the same time, the control excitation in the test will not cause damage to the solenoid valve and electric squib on the engine, so that the solenoid valve and electric squib can be used multiple times, thereby making the test more economical, safe and reliable.

[0036] 2. The present invention uses an equivalent device tester to directly detect the excitation current and load-end voltage of the control loop, so as to determine the correctness and reliability of the electrical performance parameters of the ground test control loop. At the same time, the control channel excitation current and load-end voltage are displayed through the touch screen, and the collected current and voltage data are recorded and saved to facilitate subsequent processing and analysis.

[0037] 3. The present invention uses an ARM processor to communicate data and instructions, uses the TCP protocol to receive network instructions issued by a remote monitoring host, switches the control loop through the FPGA, receives FPGA sampling data and transmits the data to the CPU processor through the TCP protocol, can realize remote connection control of the equivalent device test system, and directly transmits the data to the remote monitoring host for further analysis and processing of the data.

[0038] 4. The present invention realizes data and instruction interaction with the ARM processor through the CPU processor, sends instructions to the ARM processor, and can obtain sampling data of the ARM processor in real time.

[0039] 5. The present invention can control the test through the local touch screen display of the equivalent device tester, and also supports remote control through Ethernet connection to a remote monitoring host. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The structure block diagram of the rocket engine test equivalent device test system of the present invention;

[0041] Figure 2 This is a schematic diagram of the equivalent device structure in the present invention;

[0042] Figure 3 This is a principle block diagram of an equivalent device tester in the present invention;

[0043] Figure 4 This is a principle block diagram of a single-channel signal acquisition test in the present invention;

[0044] Figure 5 It is a schematic diagram of the acquisition circuit synchronization ADC in the present invention;

[0045] Figure 6 This is a schematic diagram of a sampling signal transmission circuit in the present invention;

[0046] Figure 7 The linear voltage regulator module principle of the present invention Figure 1 (output 1.8V voltage);

[0047] Figure 8 The linear voltage regulator module principle of the present invention Figure 2 (Output 3.3V voltage.

[0048] Figure numerals: 1-equivalent electric squib connector, 2-equivalent electric squib resistor, 3-equivalent solenoid valve resistor, 4-box, 5-equivalent solenoid valve connector, 6-first electric squib connector, 7-first solenoid valve connector, 8-second electric squib connector, 9-second solenoid valve connector. DETAILED DESCRIPTION

[0049] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0050] like Figure 1 As shown, the present invention provides a rocket engine test equivalent device test system, including an equivalent device and an equivalent device tester. The equivalent device tester is used to receive an excitation signal transmitted by an external control system, transmit the excitation signal to the equivalent device, detect the loop current signal after the excitation of the equivalent device, calculate the load terminal voltage through the current, and thus determine the correctness of the control channel voltage, control timing and working current of the control loop.

[0051] like Figure 2 As shown, the equivalent device includes 24-way equivalent electric squib resistors 2, 24-way equivalent solenoid valve resistors 3, an equivalent electric squib connector 1, and an equivalent solenoid valve connector 5. The 24-way equivalent electric squib resistors 2 and 24-way equivalent solenoid valve resistors 3 are arranged in a box 4, and the equivalent electric squib connector 1 and the equivalent solenoid valve connector 5 are arranged on the outer shell of the box 4. The performance parameters of the equivalent electric squib resistor 2 are respectively 1Ω resistance and 50W power, and the performance parameters of the equivalent solenoid valve resistor 3 are respectively 30Ω resistance and 100W power; multiple connection points are arranged on the equivalent electric squib connector 1 and the equivalent solenoid valve connector 5; the two ends of the multi-way equivalent electric squib resistors 2 are respectively connected to the connection points on the equivalent electric squib connector 1 in a one-to-one correspondence; the two ends of the multi-way equivalent solenoid valve resistors 3 are respectively connected to the connection points on the equivalent solenoid valve connector 5 in a one-to-one correspondence; in this embodiment, the output lines of the same end of the 24-way equivalent electric squib resistors 2 and the 24-way equivalent solenoid valve resistors 3 converge to form a wiring harness output and are correspondingly connected to the connector 1. The ground test control program is loaded through the external control system, and the electrical excitation signal output to the electric explosion valve or solenoid valve is loaded to both ends of the equivalent load according to the predetermined timing. Then, the control loop current and load end voltage data are collected and processed through the equivalent device tester.

[0052] like Figure 1 , Figure 3 and Figure 4 As shown, the equivalent device tester includes a current acquisition and conditioning unit, an ARM+FPGA processing unit, a monitoring unit and four external connectors. The four external connectors include a first electric squib connector 6, a first solenoid valve connector 7, a second electric squib connector 8 and a second solenoid valve connector 9; the equivalent electric squib connector 1 and the equivalent solenoid valve connector 5 are respectively connected to the first electric squib connector 6 and the first solenoid valve connector 7 of the equivalent device tester; the second electric squib connector 8 and the second solenoid valve connector 9 of the equivalent device tester are respectively connected to the aviation plug interface of the external control system; the current acquisition and conditioning unit includes a current sensor, a conditioning circuit and a synchronous ADC chip; the current sensor is used to collect the loop current signal after excitation of the equivalent device response and transmit the collected loop current signal to the conditioning circuit; the conditioning circuit is used to convert the loop current signal into an isolation voltage signal and send it to the synchronous ADC chip. The isolation voltage signal is 0-10V. In this embodiment The conditioning circuit includes a current transformer and an isolation circuit; the synchronous ADC chip is used to sample and process the isolated voltage signal and transmit the sampled signal to the ARM+FPGA processing unit; the ARM+FPGA processing unit is used to receive the sampled data and transmit the data to the monitoring unit, communicate data and instructions with the monitoring unit, receive the instructions of the monitoring unit, and switch the channel of the collected signal; the monitoring unit includes a CPU processor, a remote monitoring host and a touch screen; the CPU processor is used to interact with the ARM processor for data and instructions, send instructions to the ARM processor, and obtain the sampled data of the ARM processor in real time; the interface of the LCD touch screen includes a display interface and a control interface, which is used to display the collected data in real time through the display interface and control the test through the control interface. The remote monitoring host establishes a network connection with the CPU processor through Ethernet; and interacts with the CPU processor for data and instructions through the TCP protocol.

[0053] The ARM+FPGA processing unit is responsible for communicating data and instructions with the local monitoring host and the remote monitoring host, receiving the instructions of the monitoring host through the TCP protocol, switching the loop through the FPGA, switching the channel for collecting signals, receiving FPGA sampling data and transmitting the data to the monitoring host through the TCP protocol; the remote monitoring host includes a host computer and a display; the remote monitoring host establishes a network connection with the local monitoring host through Ethernet for data communication, which is used for remote real-time monitoring of the effect of the equivalent tester; the panel of the equivalent tester is equipped with 48 LED indicator lights for displaying the on and off of the corresponding channels.

[0054] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4The control timing excitation signal of the electric explosion valve or solenoid valve is loaded into the equivalent electric explosion tube resistor 2 and the equivalent solenoid valve resistor 3 load, and then transmitted to the FPGA chip after being collected and processed by the ADC after the conditioning circuit, and displayed through the soft panel indicator light and curve form, and the data can also be transmitted to the monitoring host in real time through Ethernet for display.

[0055] like Figure 5 , 6 As described above, the acquisition circuit uses the synchronous sampling AD7076 as the sampling conversion chip to perform signal acquisition conversion. Before the signal enters the chip, it is maintained by RC to make the signal more stable. The signal passes through the chip to convert the analog quantity into a digital quantity for CPU processing, and then transmits it to Figure 6 The sampling signal transmission circuit in the acquisition circuit is then transmitted to the FPGA. The ARM+FPGA processing chip receives instructions from the network remote monitoring host through the TCP protocol, switches the FPGA circuit, and transmits the sampling data transmitted by the acquisition circuit to the host through the TCP interface through the TCP protocol.

[0056] like Figure 7 and Figure 8 As shown, the linear voltage regulator module outputs stable 3.3V and 1.8V voltages through the SPX3819 chip to provide power for other modules in the circuit.

[0057] The present invention also provides a testing method for the above equivalent device testing system, comprising the following steps:

[0058] Step 1) Set the name of the channel 3 of the equivalent solenoid valve resistance to be tested, the name of the channel 2 of the equivalent electric squib resistance, the storage location of the data, and the opening voltage, closing voltage and access resistance value of each channel on the software display interface of the monitoring host;

[0059] Step 2) Set the display interface, select the timing diagram interface and channel light interface in the switching interface of the display interface, and select voltage display or current display;

[0060] Step 3) After connecting the control system to the equivalent device test system, the equivalent electric squib resistor 2 and the equivalent solenoid valve 3 channels are excited and given according to a predetermined timing sequence. The equivalent device tester controls data acquisition, data storage and data playback through the buttons on the control interface of the monitoring host, receives the data transmitted in the ARM and analyzes and processes the received data;

[0061] Step 4) The collected data is displayed in the interface as a timing diagram of the state change of the corresponding channel and the state of the corresponding channel indicator light, and the voltage value or current value is switched to be displayed. Among them, the equivalent device tester displays the current value by default after connecting to the equivalent resistance box.

Claims

1. A rocket engine test equivalent device test system, Features: Includes equivalent devices and equivalent device testers; The equivalent device comprises a multi-channel equivalent electric squib resistor (2), a multi-channel equivalent solenoid valve resistor (3), an equivalent electric squib connector (1), and an equivalent solenoid valve connector (5); The equivalent electric squib connector (1) and the equivalent solenoid valve connector (5) are both provided with a plurality of connection points; The two ends of the multi-channel equivalent electric squib resistor (2) are respectively connected to the connection points on the equivalent electric squib connector (1) in a one-to-one correspondence; The two ends of the multi-channel equivalent solenoid valve resistor (3) are respectively connected to the connection points on the equivalent solenoid valve connector (5) in a one-to-one correspondence; The equivalent device tester comprises a current acquisition and conditioning unit, an ARM+FPGA processing unit, a monitoring unit and four external connectors; the four external connectors comprise a first electric squib connector (6), a first solenoid valve connector (7), a second electric squib connector (8) and a second solenoid valve connector (9); The equivalent electric squib connector (1) and the equivalent solenoid valve connector (5) are respectively connected to a first electric squib connector (6) and a first solenoid valve connector (7) of an equivalent device tester; The second electric squib connector (8) and the second solenoid valve connector (9) of the equivalent device tester are respectively connected to the aviation plug interface of the external control system; The equivalent device tester is used to receive the excitation signal transmitted by the external control system, transmit the excitation signal to the equivalent device, detect the loop current signal after the excitation responded by the equivalent device, calculate the load terminal voltage through the current, and thus determine the correctness of the control channel voltage, control timing and working current of the control loop; The current acquisition and conditioning unit includes a current sensor, a conditioning circuit and a synchronous ADC chip; The current sensor is used to collect the loop current signal after the excitation of the equivalent device response and transmit the collected loop current signal to the conditioning circuit; The conditioning circuit is used to convert the loop current signal into an isolated voltage signal and send it to the synchronous ADC chip; The synchronous ADC chip is used to sample and process the isolated voltage signal and transmit the sampled signal to the ARM+FPGA processing unit; The ARM+FPGA processing unit is used to receive the sampled data and transmit the data to the monitoring unit, communicate data and instructions with the monitoring unit, receive instructions from the monitoring unit, and switch the channel for collecting signals; The monitoring unit includes a CPU processor and a touch display screen; The CPU processor is used to exchange data and instructions with the ARM processor, send instructions to the ARM processor, and obtain sampling data of the ARM processor in real time; The interface of the touch screen includes a display interface and a control interface, which are used to display the collected data in real time through the display interface and to control the test through the control interface.

2. A rocket engine test equivalent device test system according to claim 1, Features: The monitoring unit also includes a remote monitoring host; the remote monitoring host establishes a network connection with the CPU processor via Ethernet; and exchanges data and instructions with the CPU processor via the TCP protocol.

3. A rocket engine test equivalent device test system according to claim 2, Features: The isolation voltage signal is 0-10V.

4. A rocket engine test equivalent device test system according to claim 3, Features: The equivalent squib resistor (2) and the equivalent solenoid valve resistor (3) are both 24 circuits.

5. A rocket engine test equivalent device test system according to claim 4, Features: The panel of the equivalent device tester is provided with 48 LED indicator lights for displaying the on / off status of the corresponding electric squibs or solenoid valve channels.

6. A rocket engine test equivalent device test system according to claim 5, Features: The resistance of the equivalent electric squib resistor (2) is 1Ω; The resistance of the equivalent solenoid valve resistor (3) is 30Ω.

7. A rocket engine test equivalent device testing method using the rocket engine test equivalent device testing system according to any one of claims 1 to 6, It is characterized in that The following steps are involved: Step 1) On the software display interface of the monitoring host, set the equivalent solenoid valve resistance (3) channel to be tested, the equivalent squib resistance (2) channel, the data storage location, and the opening voltage, closing voltage and access resistance value of each channel; Step 2) Select the timing diagram interface in the switching interface of the display interface, and select voltage display or current display; Step 3) After connecting the control system to the equivalent device tester, the equivalent squib resistance (2) and the equivalent solenoid valve resistance (3) channels are stimulated and given according to a predetermined timing sequence. The equivalent device tester controls data acquisition, data storage and data playback through buttons on the control interface of the monitoring host, receives data transmitted from the ARM and analyzes and processes the received data; Step 4) Display the collected data in the interface as a timing diagram of the state change of the corresponding channel, as well as the voltage value or current value.

Images