An impulse test device, system and test method

Abstract

The present invention belongs to the field of rocket engine testing technology, and specifically relates to an impulse testing device, system and testing method. The present invention is composed of a measuring bearing frame, a calibration component, a pre-tightening steel belt, an engine fixing base, a displacement locking screw and an eddy current sensor. Through the seven steps of connecting and adjusting the impulse testing device, calibrating the impulse testing device, installing the engine and evacuating the vacuum box, ignition test, calculating the actual thrust value, obtaining the engine impulse data and data analysis and evaluation, the engine impulse test is simply and reliably carried out.

Description

Technical Field

[0001] The invention belongs to the technical field of rocket engine testing, and in particular relates to an impulse testing device, system and testing method. Background Art

[0002] With the continuous development of aerospace technology, the space for human exploration is constantly expanding. In recent years, the miniaturization or micro-miniaturization of spacecraft has become a development trend. Therefore, a propulsion system with lighter mass and more precise thrust is needed for orbit control and attitude adjustment. Some spacecraft also need to have rapid response capabilities. The use of solid rocket engine solutions can greatly reduce the mass of the propulsion system, while taking advantage of the long-term storage of solid propellants.

[0003] At present, the testing of micro-engines is also being vigorously developed both at home and abroad. The United States, Russia, Japan, France, and the Czech Republic have been conducting research on dynamic force measurement since the 1950s. In the 1970s, they have achieved some results and have been gradually applied to the thrust measurement of sounding rocket engine experiments, meeting the needs of satellite engine development. The technology is already very mature. my country started late in this regard and has a weak foundation. There are few models of measuring devices, which makes it difficult to meet the current development speed of rocket engines.

[0004] The current engine experiments are mainly carried out on medium and large thrust engines. In recent years, with the increase of precise control, the research and development of new attitude control engines has been intensified, and small thrust engines have continued to emerge. It is urgent to carry out precise testing on them, which puts higher requirements on the measurement method and test accuracy of the experimental tooling.

[0005] The impulse test device system is one of the key components of the micro-solid engine propulsion experimental system. It is mainly used to install the micro-solid propulsion engine and perform accurate thrust measurement to ensure that the engine is in the specified position and state and the thrust impulse parameter measurement is correct. At present, domestic engine technology is developing rapidly, and the size of various models is increasing. The existing test system cannot fully meet the test needs of the new micro-solid engine, so a new impulse test device is newly developed.

[0006] At present, the calibration method of micro-solid engine impulse test experiment is complex, the experimental frame requirements are high, and the measurement accuracy is easily affected by the external environment. Considering the above various situations, a simple and reliable impulse test device has become a necessary product for the current micro-solid engine experiment. Summary of the invention

[0007] The object of the present invention is to provide a simple and reliable impulse testing device, system and method.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] An impulse testing device comprises a measuring bearing frame, a calibration component, a pre-tightening steel belt, an engine fixing base, a displacement locking screw and an eddy current sensor; the displacement locking screw is connected to the center of the upper surface of the measuring bearing frame, and the eddy current sensor is connected to the displacement locking screw; the calibration component is provided in two groups, and the two groups of calibration components are respectively arranged at the two ends of the upper surface of the measuring bearing frame; the two ends of the pre-tightening steel belt are respectively connected to the bottom of the two groups of calibration components; the engine fixing base is detachably connected to the center of the upper surface of the pre-tightening steel belt; the eddy current sensor is located directly below the engine fixing base.

[0010] The calibration component includes an upper adjustment block and a lower adjustment block; the upper adjustment block and the lower adjustment block are arranged up and down; the lower adjustment block is fixedly connected to the measurement bearing frame, a pin hole is arranged at the center of the upper surface of the lower adjustment block, waist holes are symmetrically arranged on both sides, and an adjustment bolt for adjusting the elastic stretching amount of the pre-tightening steel belt is arranged in the waist hole; a through hole penetrating up and down is arranged in the center of the upper adjustment block; the two ends of the pre-tightening steel belt are respectively placed between the upper adjustment block and the lower adjustment block of the calibration components on both sides.

[0011] The measurement bearing frame comprises an upper panel, a lower panel and a support plate; the upper panel and the lower panel are connected via the support plate; and a connecting through hole is arranged on the lower panel.

[0012] The pre-tightening steel belt is made of FDP802 non-magnetic stainless steel.

[0013] The engine fixing base is a plate-like structure with a circular groove in the center, four threaded holes are opened around the circular groove, a screw column is arranged in the center of the lower surface of the fixing base, and the bottom of the screw column is a plane.

[0014] The displacement locking screw is cylindrical in shape, and four threaded holes for fixing the eddy current sensor are evenly arranged on the upper end surface of the displacement locking screw. The lower side wall of the displacement locking screw is provided with threads, and a through hole is arranged axially at the center of the displacement locking screw.

[0015] An impulse test system includes at least one impulse test device, a vacuum box, a data acquisition analyzer and a standard weight; the impulse test device is connected to the vacuum box; the data acquisition analyzer is connected to the electrical signal of an eddy current sensor; the standard weight is connected to a fixed base of an engine during calibration; and an engine ignition wire is arranged in the vacuum box.

[0016] An impulse testing method of an impulse testing system comprises the following steps:

[0017] Step 1: Connection and adjustment of impulse test device;

[0018] The lower panel of the measuring bearing frame in the impulse test device is connected and fixed to the vacuum box, two sets of calibration components are respectively fixed to the two ends of the upper surface of the measuring bearing frame, the two ends of the pre-tightening steel belt are respectively placed between the upper adjustment block and the lower adjustment block and pressed, the distance between the eddy current sensor and the steel belt is adjusted to the preset value, and the eddy current sensor is aligned with the engine fixing base;

[0019] Step 2: Calibrate the impulse test device;

[0020] The standard weight is installed on the engine fixed base, and the weights of the same weight value are added multiple times according to the preset value to obtain multiple calibration step values. The eddy current sensor obtains multiple calibration displacement variable data of the pre-tightening steel belt at the multiple calibration step values ​​and sends the obtained data to the data acquisition analyzer, which records the data;

[0021] Step 3: Install the engine and evacuate the vacuum box;

[0022] After step 2 is completed, remove the standard weight, install the engine on the engine fixing base, connect the engine to the engine ignition wire in the vacuum box, close the vacuum box, turn on the vacuum pump, evacuate the vacuum box to the preset pressure, and turn off the vacuum pump;

[0023] Step 4: Ignition test;

[0024] When the engine is ignited, the data acquisition and analysis device obtains the actual displacement variable value of the pre-tensioned steel belt when the engine is ignited, and records the time domain data and duration of the thrust change;

[0025] Step 5: Calculate the actual thrust value

[0026] Substitute the data recorded by the data acquisition analyzer in step 2 and the actual displacement variable value in step 4 into the thrust calculation formula

[0027] The actual thrust value is calculated by the maximum calibration value / maximum calibration displacement variable value=actual thrust value / actual displacement variable value;

[0028] Step 6: Obtain engine impulse data;

[0029] Substitute the actual thrust value obtained in step 5 and the duration of force action recorded in step 4 into the impulse calculation formula I=Ft to obtain the engine impulse data;

[0030] Where: I is the engine impulse;

[0031] F is the constant force, i.e. thrust, N;

[0032] t is the time of force action s;

[0033] Step 7: Data analysis and evaluation;

[0034] The data acquisition analyzer compares the engine impulse data obtained in step six with the design task book and outputs the engine performance, accuracy and reliability evaluation results.

[0035] The preset value of the distance between the eddy current sensor and the steel strip in the step 1 is 1 mm.

[0036] When the engine is installed and the vacuum box is evacuated in step three, the preset pressure of the vacuum box is less than 10Pa.

[0037] Beneficial effects:

[0038] (1) The present invention ensures the stability of the device itself and the accuracy of the experimental data by calibrating the weight before the experiment.

[0039] (2) The present invention integrates data collection and processing. When conducting a test run, the measuring device can ensure that the engine is positioned and fixed on the measuring device according to the required experimental state, collect real-time data when the engine is ignited, and analyze and process the collected data, compare it with the design task book, evaluate the performance, accuracy, reliability, etc. of the engine, and expose some problems in the engine development process, thereby pointing out the direction for improving the design and finding ways to solve the problems.

[0040] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 It is a structural front view of the present invention.

[0043] Figure 2 It is a top view of the structure of the present invention.

[0044] In the figure: 1- measurement bearing frame; 2- calibration assembly; 3- pre-tightening steel belt; 4- engine fixing base; 5- shift locking screw; 6- eddy current sensor; 7- upper adjustment block; 8- lower adjustment block. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Embodiment 1:

[0047] Reference Figures 1-2 An impulse testing device shown in the figure includes a measuring load-bearing frame 1, a calibration component 2, a pre-tightening steel belt 3, an engine fixing base 4, a displacement locking screw 5 and an eddy current sensor 6; the displacement locking screw 5 is connected to the center of the upper surface of the measuring load-bearing frame 1, and the eddy current sensor 6 is connected to the displacement locking screw 5; the calibration component 2 is arranged in two groups, and the two groups of calibration components 2 are respectively arranged at the two ends of the upper surface of the measuring load-bearing frame 1; the two ends of the pre-tightening steel belt 3 are respectively connected to the bottom of the two groups of calibration components 2; the engine fixing base 4 is detachably connected to the center of the upper surface of the pre-tightening steel belt 3; the eddy current sensor 6 is located directly below the engine fixing base 4.

[0048] In actual use, the lower panel of the measuring bearing frame 1 in the impulse test device is connected and fixed to the vacuum box, and two sets of calibration components 2 are respectively fixed on the two ends of the upper surface of the measuring bearing frame 1. The two ends of the pre-tightening steel belt 3 are respectively placed between the upper adjustment block 7 and the lower adjustment block 8 and pressed, and the distance between the eddy current sensor and the steel belt is adjusted to 1mm, and the eddy current sensor is aligned with the engine fixed base; then, the standard weights are installed on the engine fixed base 4, and weights of the same weight value are added multiple times according to the preset value to obtain multiple calibration step values. The eddy current sensor 6 obtains multiple calibration displacement variable data of the pre-tightening steel belt 3 at multiple calibration step values ​​and sends the obtained data to the data acquisition analyzer, which records the data; then, remove the standard weights, and the engine The machine is installed on the engine fixed base 4, the engine is connected to the engine ignition line in the vacuum box, the vacuum box is closed, the vacuum pump is turned on, the vacuum box is evacuated to the preset pressure, and the vacuum pump is turned off; then the engine is ignited, and the data acquisition analyzer obtains the actual displacement variable value of the pre-tightening steel belt 3 when the engine is ignited, and records the time domain data and duration of the thrust change; the data recorded by the data acquisition analyzer and the actual displacement variable value in step 4 are substituted into the thrust calculation formula to calculate the actual thrust value; then the actual thrust value and the recorded force action duration are substituted into the impulse calculation formula I=Ft to obtain the engine impulse data; then the data acquisition analyzer compares the obtained engine impulse data with the design task book, and outputs the engine performance, accuracy, and reliability evaluation results. Among them, when the engine is installed and the vacuum box is evacuated in step 3, the preset pressure of the vacuum box is less than 10Pa.

[0049] The present invention needs to perform static calibration before the formal test to verify and calibrate the accuracy of the equipment itself. During the static calibration, observe whether the pre-tightening steel belt 3 is deformed or damaged, and check whether the calibration component 2 stretches the pre-tightening steel belt 3 too tight or the forces on both ends of the pre-tightening steel belt 3 are not uniform. Perform pre-calibration inspection and preparation according to the calibration procedures. After meeting the requirements of the regulations, the weight calibration is performed. The present invention performs weight calibration before the experiment. According to the requirements, suitable weights are selected to meet the stability of the small force loading required by the equipment during static calibration. When calibrating the weights, tweezers are used to clamp the weights and increase and decrease them one by one. The weights are identified by an identification agency to avoid contact between hands and external objects. When adding weights and decreasing weights, the eddy current sensor 6 records and collects the displacement changes of the pre-tightening steel belt 3, increasing the accuracy, repeatability and stability of the experimental equipment data collection.

[0050] The impulse test performed by the present invention is not only simple but also reliable.

[0051] Embodiment 2:

[0052] Reference Figure 1 and Figure 2 An impulse testing device shown is based on the first embodiment: the calibration component 2 includes an upper adjusting block 7 and a lower adjusting block 8; the upper adjusting block 7 and the lower adjusting block 8 are arranged up and down; the lower adjusting block 8 is fixedly connected to the measuring bearing frame 1, and a pin hole is arranged at the center of the upper surface of the lower adjusting block 8, and waist holes are symmetrically arranged on both sides, and an adjusting bolt for adjusting the elastic stretching amount of the pre-tightening steel belt 3 is arranged in the waist hole; a through hole penetrating up and down is arranged in the center of the upper adjusting block 7; the two ends of the pre-tightening steel belt 3 are respectively placed between the upper adjusting block 7 and the lower adjusting block 8 of the calibration components 2 on both sides.

[0053] In actual use, the calibration component 2 is equivalent to the steel belt adjustment seat, and the upper adjustment block 7 and the lower adjustment block 8 are used to press the pre-tightening steel belt 3. There are pin holes in the middle of the calibration component 2 and at both ends of the pre-tightening steel belt 3, which are fixed with pins to prevent displacement. The screw column at the lower end of the engine fixing base 4 is locked with a nut through the central circular hole of the pre-tightening steel belt 3, and the locking screw 5 is aligned with the central circular hole of the pre-tightening steel belt 3 on the engine fixing base 4 and maintains a suitable distance.

[0054] The calibration component 2 adopts this technical solution, which can further ensure the accuracy of the test of the present invention.

[0055] Embodiment three:

[0056] Reference Figure 1 An impulse testing device shown is based on the first embodiment: the measuring bearing frame 1 comprises an upper panel, a lower panel and a support plate; the upper panel and the lower panel are connected via the support plate; a connecting through hole is provided on the lower panel.

[0057] In actual use, the measurement bearing frame 1 adopts the technical solution, which facilitates the overall stability of the experimental frame and enables the engine to be installed horizontally.

[0058] Embodiment 4:

[0059] Reference Figure 1 and Figure 2 The impulse testing device shown is based on the first embodiment: the pre-tightening steel belt 3 is made of FDP802 non-magnetic stainless steel.

[0060] In actual use, the pre-tightened steel belt 3 adopts the technical solution, which has the characteristics of good non-magnetism and good stretchability. It is used to produce elastic linear displacement changes during experimental calibration, which facilitates the acquisition system to collect impulse calculations during engine testing and weight calibration.

[0061] Embodiment five:

[0062] Reference Figure 1 and Figure 2 An impulse testing device shown is based on the first embodiment: the engine fixing base 4 is a plate-like structure with a circular groove in the center, and four threaded holes are opened around the circular groove. A screw column is arranged in the center of the lower surface of the fixing base 4, and the bottom of the screw column is a plane.

[0063] In actual use, the circular groove on the engine fixing base 4 has a circular machined concave surface of the size of the weight, which is convenient for placing the weight in the center hole during calibration. There are 4 threaded holes around the groove, which is convenient for installing the simulated engine. The setting of the screw column is convenient for installation in the reserved hole in the center of the pre-tightening steel belt 3. The bottom of the screw column is a machined plane for measuring the eddy current sensor 6 head.

[0064] The engine fixing base 4 in the plate embodiment is made of hard aluminum, which not only reduces the weight but also reduces the influence on the elastic variable of the pre-tightening steel belt, improves the time efficiency of installing the engine and reduces the error caused by the engine centering.

[0065] The fixed base adopts the technical solution, which can avoid the weight being not centered, is easy to operate, and increases the reliability of the impulse testing device.

[0066] Embodiment six:

[0067] Reference Figure 1 An impulse testing device shown is based on Example 1: the displacement locking screw 5 is cylindrical, and the upper end surface of the displacement locking screw 5 is evenly provided with 4 threaded holes for fixing the eddy current sensor 6, the lower side wall of the displacement locking screw 5 is provided with a thread, and a through hole is provided in the center of the displacement locking screw 5 along the axial direction.

[0068] In actual use, the lower side wall of the displacement locking screw 5 is provided with a thread, which can conveniently adjust the up and down displacement of the displacement locking screw 5. The center of the displacement locking screw 5 is provided with a through hole along the axial direction, which can conveniently pass the eddy current sensor 6 from the bottom of the displacement locking screw 5 to the head for fixed installation.

[0069] The displacement locking screw 5 adopts the technical solution, which can conveniently adjust the distance between the sensing head of the eddy current sensor 6 and the engine fixing base 4.

[0070] Embodiment seven:

[0071] An impulse testing system includes at least one impulse testing device, a vacuum box, a data acquisition analyzer and a standard weight; the impulse testing device is connected to the vacuum box; the data acquisition analyzer is electrically connected to an eddy current sensor 6; the standard weight is connected to an engine fixed base 4 during calibration; and an engine ignition wire is arranged in the vacuum box.

[0072] In actual use, the lower panel of the measuring bearing frame 1 in the impulse test device is connected and fixed to the vacuum box, and the two sets of calibration components 2 are respectively fixed on the two ends of the upper surface of the measuring bearing frame 1. The two ends of the pre-tightening steel belt 3 are respectively placed between the upper adjustment block 7 and the lower adjustment block 8 and pressed, and the distance between the eddy current sensor and the steel belt is adjusted, and the eddy current sensor is aligned with the engine fixed base; then, the standard weight is installed on the engine fixed base 4, and the weight of the weight is increased according to the preset value. The eddy current sensor 6 obtains the displacement change data of the pre-tightening steel belt 3 and sends the obtained data to the data acquisition analyzer. The data acquisition analyzer calculates the weight of the weight according to the calculation formula obtained by calibration. Change the time domain data and calculate the calibration impulse data; then, remove the standard weights, install the engine on the engine fixed base 4, connect the engine to the engine ignition line in the vacuum box, close the vacuum box, turn on the vacuum pump, evacuate the vacuum box to a preset pressure, and turn off the vacuum pump; ignite the engine, and the data acquisition analyzer obtains the real-time experimental data when the engine is ignited; the data acquisition analyzer brings the acquired real-time experimental data when the engine is ignited into the calculation formula obtained by calibration, and obtains the thrust change time domain data and the engine impulse data, and compares the obtained data with the design task book, and outputs the performance, accuracy, and reliability evaluation results of the engine.

[0073] The impulse test performed by adopting the technical solution of the present invention is not only simple but also reliable.

[0074] In this embodiment, the data acquisition analyzer is connected to the eddy current sensor 6 through electrical signals. The equipment acquisition device uses the PC-based measurement and control system of the American NI company. The NI hardware product is connected to the PC or laptop via USB or Ethernet. The CompactDAQ chassis is connected to the PC, and an I / O module with integrated signal conditioning is inserted into the chassis. In the data acquisition device, a special test software is developed using Microsoft VC++6.0 as the development environment. The software mainly has the following functions:

[0075] File operation: open / save data files, import calibration data, export data files;

[0076] Signal settings: Set the module, channel, filter, input range and other parameters corresponding to the signal;

[0077] Signal calibration: calibrate the sensor, calculate the linearity, hysteresis, repeatability accuracy, and use accuracy;

[0078] Signal monitoring: Display the selected signal curve and instantaneous value, but do not save;

[0079] Data acquisition: collect and save signal values ​​in real time, and display the selected signal curve and instantaneous value in real time;

[0080] Curve display: The curve can be stretched horizontally to display the signal value at the corresponding moment of the mouse;

[0081] Data processing: can process and analyze the push pressure sensor signals of the extended access;

[0082] Report printing: print calibration records, data curves, signal instantaneous values, data summary tables, etc.;

[0083] File format: Each test corresponds to a data file, including the signal parameter settings, calibration records, test data and data processing results.

[0084] Embodiment eight:

[0085] An impulse testing method of an impulse testing system comprises the following steps:

[0086] Step 1: Connection and adjustment of impulse test device;

[0087] The lower panel of the measuring bearing frame 1 in the impulse test device is connected and fixed to the vacuum box, and two sets of calibration components 2 are respectively fixed to the two ends of the upper surface of the measuring bearing frame 1, and the two ends of the pre-tightening steel belt 3 are respectively placed between the upper adjustment block 7 and the lower adjustment block 8 and pressed, and the distance between the eddy current sensor and the steel belt is adjusted to a preset value, and the eddy current sensor is aligned with the engine fixed base;

[0088] Step 2: Calibrate the impulse test device;

[0089] The standard weight is installed on the engine fixed base 4, and the weights of the same weight value are added multiple times according to the preset value to obtain multiple calibration step values. The eddy current sensor 6 obtains multiple calibration displacement variable data of the pre-tightening steel belt 3 at the multiple calibration step values ​​and sends the obtained data to the data acquisition analyzer, which records the data;

[0090] Step 3: Install the engine and evacuate the vacuum box;

[0091] After step 2 is completed, remove the standard weight, install the engine on the engine fixing base 4, connect the engine to the engine ignition wire in the vacuum box, close the vacuum box, turn on the vacuum pump, evacuate the vacuum box to the preset pressure, and turn off the vacuum pump;

[0092] Step 4: Ignition test;

[0093] When the engine is ignited, the data acquisition and analysis device obtains the actual displacement variable value of the pre-tightening steel belt 3 when the engine is ignited, and records the time domain data and duration of the thrust change;

[0094] Step 5: Calculate the actual thrust value

[0095] Substitute the data recorded by the data acquisition analyzer in step 2 and the actual displacement variable value in step 4 into the thrust calculation formula

[0096] The actual thrust value is calculated by the maximum calibration value / maximum calibration displacement variable value=actual thrust value / actual displacement variable value;

[0097] Step 6: Obtain engine impulse data;

[0098] Substitute the actual thrust value obtained in step 5 and the duration of force action recorded in step 4 into the impulse calculation formula I=Ft to obtain the engine impulse data;

[0099] Where: I is the engine impulse;

[0100] F is the constant force, i.e. thrust, N;

[0101] t is the time of force action s;

[0102] Step 7: Data analysis and evaluation;

[0103] The data acquisition analyzer compares the engine impulse data obtained in step six with the design task book and outputs the engine performance, accuracy and reliability evaluation results.

[0104] Preferably, in the step 1, the preset value of the distance between the eddy current sensor and the steel strip is 1 mm.

[0105] Preferably, when the engine is installed and the vacuum box is evacuated in step three, the preset pressure for evacuating the vacuum box is less than 10Pa.

[0106] In actual use, static calibration is required before formal testing. Verify and calibrate the accuracy of the equipment itself. When performing static calibration, observe whether the pre-tensioned steel belt is deformed or damaged, whether the calibration component stretches the pre-tensioned steel belt too tight or the force on both ends of the steel belt is not uniform, and perform pre-calibration inspection and preparation according to the calibration procedures. Perform weight calibration to meet the requirements of the regulations. After the calibration is completed, analyze and calculate the data obtained by the data acquisition system to obtain the accuracy of the test frame itself. The data acquisition analyzer clearly outputs the data analysis and evaluation results.

[0107] In summary, the present invention includes a measuring bearing frame, a calibration component, a pre-tightening steel belt, an engine fixing base, a displacement locking screw and an eddy current sensor; the displacement locking screw is connected to the center of the upper surface of the measuring bearing frame, and the eddy current sensor is connected to the displacement locking screw; two groups of calibration components are provided, and the two groups of calibration components are respectively arranged at the two ends of the upper surface of the measuring bearing frame; the two ends of the pre-tightening steel belt are respectively connected to the bottom of the two groups of calibration components; the engine fixing base is detachably connected to the center of the upper surface of the pre-tightening steel belt; and the eddy current sensor is located directly below the engine fixing base. Through the seven steps of connecting and adjusting the impulse test device, calibrating the impulse test device, installing the engine and evacuating the vacuum box, ignition test, calculating the actual thrust value, obtaining the engine impulse data and data analysis and evaluation, the engine impulse test was simply and reliably carried out.

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0109] In the absence of conflicts, technicians in this field can combine the relevant technical features in the above examples according to actual conditions to achieve corresponding technical effects. The specific combinations are not described here one by one.

[0110] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0111] The above are only preferred embodiments of the present invention. The present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An impulse testing device, characterized in that: The invention comprises a measuring bearing frame (1), a calibration component (2), a pre-tightening steel belt (3), an engine fixing base (4), a displacement locking screw (5) and an eddy current sensor (6); the displacement locking screw (5) is connected to the center of the upper surface of the measuring bearing frame (1), and the eddy current sensor (6) is connected to the displacement locking screw (5); the calibration component (2) is provided in two groups, and the two groups of calibration components (2) are respectively arranged at the two ends of the upper surface of the measuring bearing frame (1); the two ends of the pre-tightening steel belt (3) are respectively connected to the bottom of the two groups of calibration components (2); the engine fixing base (4) is detachably connected to the center of the upper surface of the pre-tightening steel belt (3); the eddy current sensor (6) is located directly below the engine fixing base (4); The calibration component (2) comprises an upper adjustment block (7) and a lower adjustment block (8); the upper adjustment block (7) and the lower adjustment block (8) are arranged vertically; the lower adjustment block (8) is fixedly connected to the measurement bearing frame (1); a pin hole is arranged at the center of the upper surface of the lower adjustment block (8), and waist holes are symmetrically arranged on both sides, and adjustment bolts for adjusting the elastic stretching amount of the pre-tightening steel belt (3) are arranged in the waist holes; a through hole is arranged in the center of the upper adjustment block (7) and passes through the upper and lower parts; the two ends of the pre-tightening steel belt (3) are respectively placed between the upper adjustment block (7) and the lower adjustment block (8) of the calibration components (2) on both sides; The measurement bearing frame (1) comprises an upper panel, a lower panel and a support plate; the upper panel and the lower panel are connected via the support plate; and a connecting through hole is provided on the lower panel.

2. An impulse testing device as claimed in claim 1, characterized in that: The pre-tightening steel belt (3) is made of FDP802 non-magnetic stainless steel.

3. An impulse testing device as claimed in claim 1, characterized in that: The engine fixing base (4) is a plate-like structure with a circular groove in the center, and four threaded holes are opened around the circular groove. A screw column is arranged in the center of the lower surface of the fixing base (4), and the bottom of the screw column is a flat surface.

4. An impulse testing device as claimed in claim 1, characterized in that: The displacement locking screw (5) is cylindrical in shape, and the upper end surface of the displacement locking screw (5) is evenly provided with four threaded holes for fixing the eddy current sensor (6), the lower side wall of the displacement locking screw (5) is provided with threads, and the center of the displacement locking screw (5) is provided with a through hole along the axial direction.

5. An impulse test system, characterized in that: The invention comprises at least one impulse test device as claimed in any one of claims 1 to 4, and further comprises a vacuum box, a data acquisition analyzer and a standard weight; the impulse test device is connected to the vacuum box; the data acquisition analyzer is electrically connected to an eddy current sensor (6); the standard weight is connected to an engine fixed base (4) during calibration; and an engine ignition wire is arranged in the vacuum box.

6. The impulse testing method of the impulse testing system according to claim 5, characterized in that: The steps include: Step 1: Connection and adjustment of impulse test device; The lower panel of the measuring bearing frame (1) in the impulse test device is connected and fixed to the vacuum box, two sets of calibration components (2) are respectively fixed to the two ends of the upper surface of the measuring bearing frame (1), the two ends of the pre-tightening steel belt (3) are respectively placed between the upper adjustment block (7) and the lower adjustment block (8) and pressed, the distance between the eddy current sensor and the steel belt is adjusted to a preset value, and the eddy current sensor is aligned with the engine fixing base; Step 2: Calibrate the impulse test device; The standard weight is mounted on the engine fixed base (4), and weights of the same weight value are added multiple times according to preset values ​​to obtain multiple calibration step values. The eddy current sensor (6) obtains multiple calibration displacement variable data of the pre-tightening steel belt (3) at the multiple calibration step values ​​and sends the obtained data to the data acquisition analyzer, which records the data; Step 3: Install the engine and evacuate the vacuum box; After step 2 is completed, remove the standard weight, install the engine on the engine fixing base (4), connect the engine to the engine ignition wire in the vacuum box, close the vacuum box, turn on the vacuum pump, evacuate the vacuum box to a preset pressure, and turn off the vacuum pump; Step 4: Ignition test; The engine is ignited, and the data acquisition and analysis device obtains the actual displacement variable value of the pre-tightening steel belt (3) when the engine is ignited, and records the time domain data and duration of the thrust change; Step 5: Calculate the actual thrust value Substitute the data recorded by the data acquisition analyzer in step 2 and the actual displacement variable value in step 4 into the thrust calculation formula Maximum calibration value / maximum calibration displacement variable value=actual thrust value / actual displacement variable value Calculate the actual thrust value; Step 6: Obtain engine impulse data; Substitute the actual thrust value obtained in step 5 and the duration of force action recorded in step 4 into the impulse calculation formula I=Ft to obtain the engine impulse data; Where: I is the engine impulse; F is the constant force, i.e. thrust, N; t is the time of force action s; Step 7: Data analysis and evaluation; The data acquisition analyzer compares the engine impulse data obtained in step six with the design task book and outputs the engine performance, accuracy and reliability evaluation results.

7. The impulse testing method of the impulse testing system according to claim 6, characterized in that: The preset value of the distance between the eddy current sensor and the steel strip in the step 1 is 1 mm.

8. The impulse testing method of the impulse testing system according to claim 6, characterized in that: When the engine is installed and the vacuum box is evacuated in step three, the preset pressure of the vacuum box is less than 10Pa.

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