Test System and Method for the Reliability of Engine Telemetry Instruments

Abstract

The present invention provides a test system and method for the reliability of engine telemetry instruments, which solves the problem that there is no test device for multi-factor reliability verification of telemetry instruments. The system includes a fixed platform, a main shaft, measurement sensors, reference sensors, a calibrator, a standard source, a rotating mechanism, a lifting platform, a heating module and a computer; the main shaft is located above the fixed platform, and a slip ring is installed at the upper end; the measurement sensors and the reference sensors are installed adjacent to each other on the main shaft, and the measurement sensors are used for signal input connection with the rotor assembly; the calibrator is connected to the reference sensors through the slip ring; the standard source is connected to the electrical signal input of the rotor assembly through the slip ring; the rotating mechanism is used to drive the main shaft to rotate; the lifting platform is used to drive the main shaft to move up and down; the heating module is arranged on the outer periphery of the lower part of the rotor assembly and the main shaft, both the measurement sensors and the reference sensors are located in the heating module, and the lower end of the rotor assembly extends out of the heating module; the computer is used for connection with the stator assembly.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine operating condition monitoring equipment, relates to telemetry instrument testing technology, and particularly relates to a test system and a test method for performing a reliability test on a telemetry instrument for an engine rotating component. Background Art

[0002] Testing technology is one of the three major supporting technologies of aero-engines, alongside design, materials, and processes, and is an effective way to assess new materials, new technologies, new structures, and new processes for engines. Measuring the moving components such as engine turbines, disks, and shafts in high-temperature and high-speed rotation environments is an essential test content for engine design verification. During the test, sensors need to be installed on the surface of the moving components and rotate at high speed with the rotor, making it difficult to directly lead the signals to ground equipment for analysis and processing. To address this, wireless telemetry instruments that can be installed at the end of the rotor shaft have been developed to collect and transmit sensor signals to ground equipment.

[0003] Due to the complexity of aero-engine test facilities and equipment, the complexity and high difficulty of testing technology, as well as the large number of test items, long cycle, high cost, and high risk, there are very high requirements for the accuracy and reliability of the instruments used during the test. The telemetry instrument for engine rotating components is an important part of the engine's overall and component test facilities, and its reliability plays a crucial role in the effectiveness of engine tests.

[0004] Different from ordinary ground test equipment, the telemetry instrument for engine rotating components is installed inside the engine, and the working environment has the characteristics of high temperature, high speed, and high vibration, with an extremely harsh working environment. An aero-engine is a type of heat engine, and its internal working temperature can reach 2000 degrees Celsius. Despite using thermal barrier coatings, air-cooling heat dissipation, and other methods, the temperature of the turbine shaft can still reach 300 degrees Celsius, far exceeding the reliable working temperature of electronic components. The rotor speed of aero-engines generally exceeds 10,000 RPM, and some small turboshaft engines can reach 60,000 RPM. The telemetry instrument needs to bear a huge centrifugal load, and the flexural vibration formed by high-speed rotation also has a great impact on the telemetry instrument. Therefore, the telemetry instrument needs to undergo sufficient test verification before being put into use to ensure its working reliability.

[0005] Currently, there is no effective test device that can perform multi-factor reliability verification on the telemetry instrument. Before delivery, only basic functional and performance tests can be carried out in a laboratory environment, which is quite different from the actual working environment. Only when it is delivered and put into use does it come into contact with the actual working environment, and a large amount of joint debugging and troubleshooting work needs to be carried out on-site, which has a great impact on the actual test process. Moreover, due to the inability to conduct sufficient test verification before delivery, the product reliability is uncertain. Once problems occur during the long-term working process, it may result in the loss of test data and even the failure of the test. Summary of the Invention

[0006] In order to solve the technical problems that there is no existing test device for multi-element reliability verification of telemetry instruments, only basic functional performance tests can be carried out, and sufficient experimental verification cannot be carried out, resulting in uncertain reliability and even test data loss or test failure during the working process, the present invention provides a test system and method for the reliability of engine telemetry instruments.

[0007] To achieve the above object, the technical solution provided by the present invention is:

[0008] A test system for the reliability of engine telemetry instruments, the telemetry instrument includes a stator assembly and a rotor assembly that cooperates with the stator assembly. The special features are: it includes a fixed platform, a main shaft, a measurement sensor, a reference sensor, a calibrator, a standard source, a rotating mechanism, a lifting platform, a heating module and a computer;

[0009] The fixed platform is used to install the stator assembly of the telemetry instrument;

[0010] The main shaft is located above the fixed platform, the lower end of which is used to install the rotor assembly of the telemetry instrument, and a slip ring is installed at the upper end;

[0011] The measurement sensor and the reference sensor are adjacently installed on the main shaft, and the measurement sensor is used to connect with the electrical signal input of the rotor assembly;

[0012] The calibrator is connected to the reference sensor through the slip ring;

[0013] The standard source is connected to the electrical signal input of the rotor assembly through the slip ring;

[0014] The rotating mechanism is used to drive the main shaft to rotate;

[0015] The lifting platform is used to drive the main shaft to move up and down so that the distance between the stator assembly and the rotor assembly meets the test requirements; the stator assembly receives the data of the rotor assembly through optical and electrical communication;

[0016] The heating module is arranged on the outer periphery of the lower part of the rotor assembly and the main shaft, and both the measurement sensor and the reference sensor are located inside the heating module, and the lower end of the rotor assembly extends out of the heating module;

[0017] The computer is used to connect with the stator assembly.

[0018] Further, it further includes a calibration sensor for calibrating the measurement sensor and the reference sensor.

[0019] Further, the main shaft is of a hollow structure;

[0020] The heating module is a heater.

[0021] Further, an adapter flange for connecting the rotor assembly is provided at the lower end of the main shaft.

[0022] Further, the rotating mechanism is a high-speed motor installed on the lifting platform, and its output is connected to the main shaft.

[0023] Meanwhile, the present invention provides a test method for the reliability of an engine telemetry instrument, which is characterized in that the above test system for the reliability of an engine telemetry instrument is adopted, and it includes the following steps:

[0024] 1) Installation

[0025] 1.1) Connect the measurement sensor to the electrical signal input of the rotor assembly, and connect the reference sensor to the calibrator through the slip ring.

[0026] 1.2) Install the stator assembly of the telemetry instrument to be tested on the fixed platform, install the rotor assembly at the lower end of the main shaft, and set the stator assembly and the rotor assembly coaxially. Then connect the standard source to the electrical signal input of the rotor assembly.

[0027] 1.3) Adjust the vertical movement of the main shaft through the lifting platform to make the distance between the stator assembly and the rotor assembly meet the test requirements.

[0028] 2) Test

[0029] The test includes a static normal temperature test a, a static high temperature test b, a low speed high temperature test c, and a high speed high temperature test d.

[0030] The specific steps of the static normal temperature test a are as follows:

[0031] a.1) Function test

[0032] a.1.1) Give the standard source an output temperature of A0 °C, and the standard source inputs a corresponding thermoelectric potential signal to the rotor assembly through the slip ring.

[0033] a.1.2) Power on the telemetry instrument to be tested. After the circuit in the rotor assembly amplifies and performs AD conversion on the thermoelectric potential signal in step a.1.1), a digitized thermoelectric potential value E1 is generated and transmitted to the stator assembly. The computer collects the thermoelectric potential value E2 output by the stator assembly and obtains the corresponding temperature A1 °C. Compare the temperature A0 °C and the temperature A1 °C. If the difference between the two is within the error tolerance range, execute step a.2); otherwise, the reliability of the telemetry instrument under static normal temperature is unqualified, and the static normal temperature test a ends.

[0034] a.2) Performance test

[0035] a.2.1) The calibrator reads the temperature B0 °C of the reference sensor.

[0036] Meanwhile, the temperature measured by the measurement sensor is transmitted to the stator assembly through the rotor assembly, and the computer reads the temperature B1 °C of the stator assembly;

[0037] a.2.2) Compare the temperatures B0 °C and B1 °C. If the difference between the two is within the allowable error range, the telemetry instrument is qualified for reliability under static normal temperature; if not, it is unqualified;

[0038] The static high-temperature test b specifically includes the following steps:

[0039] b.1) Construct the test conditions

[0040] Turn on the heating module to make the temperature of the rotor assembly in the heating module reach the test-set high-temperature;

[0041] b.2) Function test

[0042] b.2.1) Give the standard source an output temperature C0 °C, and the standard source inputs a corresponding thermoelectric potential signal to the rotor assembly through the slip ring;

[0043] b.2.2) Power on the telemetry instrument to be tested. After the circuit in the rotor assembly amplifies and performs AD conversion on the thermoelectric potential signal in step b.2.1), a digital thermoelectric potential value E3 is generated and transmitted to the stator assembly. The computer collects the thermoelectric potential value E4 output by the stator assembly and obtains the corresponding temperature C1 °C. Compare the temperatures C0 °C and C1 °C. If the difference between the two is within the allowable error range, execute step b.3); if not, the telemetry instrument is unqualified for reliability under static high temperature, and the static high-temperature test b ends;

[0044] b.3) Performance test

[0045] b.3.1) The calibrator reads the temperature D0 °C of the reference sensor;

[0046] Meanwhile, the temperature measured by the measurement sensor is transmitted to the stator assembly through the rotor assembly, and the computer reads the temperature D1 °C of the stator assembly;

[0047] b.3.2) Compare the temperatures D0 °C and D1 °C. If the difference between the two is within the allowable error range, the telemetry instrument is qualified for reliability under static high temperature; if not, it is unqualified;

[0048] The low-speed high-temperature test c specifically includes the following steps:

[0049] c.1) Construct the test conditions

[0050] Start the rotating mechanism to make the rotational speed of the main shaft reach the set low speed;

[0051] Turn on the heating module to make the temperature of the rotor assembly in the heating module reach the test-set high-temperature;

[0052] c.2) Functional test

[0053] c.2.1) Give the standard source an output temperature of F0 °C, and the standard source inputs a corresponding thermoelectric potential signal to the rotor assembly through the slip ring;

[0054] c.2.2) Power on the telemetry instrument to be tested. After the circuit in the rotor assembly amplifies and performs AD conversion on the thermoelectric potential signal in step c.2.1), a digital thermoelectric potential value E5 is generated and transmitted to the stator assembly. The computer collects the thermoelectric potential value E6 output by the stator assembly and obtains the corresponding temperature F1 °C. Compare the temperature F0 °C and the temperature F1 °C. If the difference between the two is within the allowable error range, execute step c.3); if not, the reliability of the telemetry instrument is unqualified at low speed and high temperature, and the low-speed high-temperature test c ends;

[0055] c.3) Performance test

[0056] c.3.1) The calibrator reads the temperature G0 °C of the reference sensor;

[0057] Meanwhile, the temperature measured by the measuring sensor is transmitted to the stator assembly through the rotor assembly, and the computer reads the temperature G1 °C of the stator assembly;

[0058] c.3.2) Compare the temperature G0 °C and G1 °C. If the difference between the two is within the allowable error range, the reliability of the telemetry instrument is qualified at high speed and high temperature; if not, it is unqualified;

[0059] The high-speed high-temperature test d specifically includes the following steps:

[0060] d.1) Construct test conditions

[0061] Start the rotating mechanism to make the rotational speed of the main shaft reach the set high rotational speed;

[0062] Turn on the heating module to make the temperature of the rotor assembly in the heating module reach the test-set high-temperature temperature;

[0063] d.2) Functional test

[0064] d.2.1) Give the standard source an output temperature of H0 °C, and the standard source inputs a corresponding thermoelectric potential signal to the rotor assembly through the slip ring;

[0065] d.2.2) Power on the telemetry instrument under test. After the circuit in the rotor assembly amplifies and performs AD conversion on the thermoelectric potential signal in step d.2.1), a digitized thermoelectric potential value E7 is generated and transmitted to the stator assembly. The computer collects the thermoelectric potential value E8 output by the stator assembly and obtains the corresponding temperature H1 °C. Compare the temperature H0 °C and the temperature H1 °C. If the difference between the two is within the allowable error range, perform step d.3); otherwise, the reliability of the telemetry instrument at high speed and high temperature is unqualified, and the high-speed and high-temperature test d ends;

[0066] d.3) Performance test

[0067] d.3.1) The calibrator reads the temperature I0 °C of the reference sensor;

[0068] At the same time, the temperature measured by the measurement sensor is transmitted to the stator assembly through the rotor assembly, and the computer reads the temperature I1 °C of the stator assembly;

[0069] c.3.2) Compare the temperature I0 °C and I1 °C. If the difference between the two is within the allowable error range, the reliability of the telemetry instrument at high speed and high temperature is qualified; otherwise, it is unqualified;

[0070] 3) Reliability determination of the telemetry instrument

[0071] When the reliability of the telemetry instrument at static normal temperature, static high temperature, low speed and high temperature is qualified, the reliability of the telemetry instrument under test is qualified.

[0072] Furthermore, before step 1.1), there is also a calibration step for the measurement sensor and the reference sensor:

[0073] The standard heat source gives the main shaft a temperature, and the calibration sensor measures the temperature M0 °C of the main shaft. At the same time, the calibrator respectively obtains the temperature M1 °C of the measurement sensor and the temperature M2 °C of the reference sensor, and compares whether the temperatures M1 °C, M2 °C and M0 °C are consistent. If they are consistent, perform step 1.1); otherwise, replace the measurement sensor and the reference sensor that are inconsistent with M0 °C.

[0074] At the same time, the present invention also provides another test method for the reliability of the engine telemetry instrument, which is characterized in that the above test system for the reliability of the engine telemetry instrument is adopted, including the following steps:

[0075] 1) Installation

[0076] 1.1) Connect the measurement sensor to the electrical signal input of the rotor assembly, and connect the reference sensor to the calibrator through the slip ring;

[0077] 1.2) Install the stator assembly of the telemetry instrument under test on a fixed platform, install the rotor assembly at the lower end of the main shaft, and set the stator assembly and the rotor assembly coaxially. Connect the standard source to the electrical signal input of the rotor assembly.

[0078] 1.3) Adjust the vertical movement of the main shaft through the lifting platform so that the distance between the stator assembly and the rotor assembly meets the test requirements.

[0079] 2) Test

[0080] The test includes static normal temperature test a, static high temperature test b, low speed high temperature test c, and high speed high temperature test d.

[0081] The specific steps of the static normal temperature test a are as follows:

[0082] a.1) Give the standard source an output temperature of A0 °C, and the standard source inputs a corresponding thermoelectric potential signal to the rotor assembly through the slip ring.

[0083] At the same time, the calibrator reads the temperature B0 °C of the reference sensor.

[0084] a.2) Power on the telemetry instrument under test.

[0085] a.3) After the circuit in the rotor assembly amplifies and performs AD conversion on the thermoelectric potential signal in step a.1), a digital thermoelectric potential value E1 is generated and transmitted to the stator assembly. The computer collects the thermoelectric potential value E2 output by the stator assembly and obtains the corresponding temperature A1 °C.

[0086] At the same time, the temperature measured by the measurement sensor is transmitted to the stator assembly through the rotor assembly, and the computer reads the temperature B1 °C of the stator assembly.

[0087] a.4) Compare the temperature A0 °C with A1 °C, and the temperature B0 °C with B1 °C. If the differences between A0 °C and A1 °C, and between B0 °C and B1 °C are both within the allowable error range, the telemetry instrument is reliable under static normal temperature; otherwise, it is unqualified.

[0088] The specific steps of the static high temperature test b are as follows:

[0089] b.1) Construct the test conditions

[0090] Turn on the heating module to make the temperature of the rotor assembly in the heating module reach the set high temperature of the test.

[0091] b.2) Give the standard source an output temperature of C0 °C, and the standard source inputs a corresponding thermoelectric potential signal to the rotor assembly through the slip ring.

[0092] At the same time, the calibrator reads the temperature D0 °C of the reference sensor.

[0093] b.3) Power on the telemetry instrument under test;

[0094] b.4) After the circuit in the rotor assembly amplifies and performs AD conversion on the thermoelectric potential signal in step b.2), a digitized thermoelectric potential value E3 is generated and transmitted to the stator assembly. The computer collects the thermoelectric potential value E4 output by the stator assembly and obtains the corresponding temperature C1 °C;

[0095] Meanwhile, the temperature measured by the measurement sensor is transmitted from the rotor assembly to the stator assembly through the rotor assembly, and the computer reads the temperature D1 °C of the stator assembly;

[0096] b.5) Compare the temperature C0 °C with the temperature C1 °C, and the temperature D0 °C with D1 °C. If the differences between C0 °C and C1 °C, and between D0 °C and D1 °C are both within the allowable error range, the telemetry instrument is qualified for reliability under static high temperature; if not, it is unqualified;

[0097] The low-speed high-temperature test c specifically includes the following steps:

[0098] c.1) Construct the test conditions

[0099] Start the rotating mechanism to make the rotational speed of the main shaft reach the set low rotational speed;

[0100] Turn on the heating module to make the temperature of the rotor assembly in the heating module reach the test-set high-temperature temperature;

[0101] c.2) Give the standard source an output temperature F0 °C, and the standard source inputs a corresponding thermoelectric potential signal to the rotor assembly through the slip ring;

[0102] Meanwhile, the calibrator reads the temperature G0 °C of the reference sensor;

[0103] c.3) Power on the telemetry instrument under test;

[0104] c.4) After the circuit in the rotor assembly amplifies and performs AD conversion on the thermoelectric potential signal in step c.2), a digitized thermoelectric potential value E5 is generated and transmitted to the stator assembly. The computer collects the thermoelectric potential value E6 output by the stator assembly and obtains the corresponding temperature F1 °C;

[0105] Meanwhile, the temperature measured by the measurement sensor is transmitted from the rotor assembly to the stator assembly through the rotor assembly, and the computer reads the temperature G1 °C of the stator assembly;

[0106] c.5) Compare the temperature F0 °C with the temperature F1 °C, and compare the temperature G0 °C with G1 °C. If the differences between F0 °C and F1 °C, and between G0 °C and G1 °C are both within the allowable error range, the telemetry instrument is qualified for reliability under low-speed high temperature; if not, it is unqualified;

[0107] The high-speed high-temperature test d specifically includes the following steps:

[0108] d.1) Construct test conditions

[0109] Start the rotating mechanism to make the rotational speed of the main shaft reach the set high rotational speed;

[0110] Turn on the heating module to make the temperature of the rotor assembly in the heating module reach the test - set high - temperature;

[0111] d.2) Give the standard source an output temperature of H0 °C, and the standard source inputs a corresponding thermoelectric potential signal to the rotor assembly through the slip ring;

[0112] At the same time, the calibrator reads the temperature I0 °C of the reference sensor;

[0113] d.3) Power on the telemetry instrument to be measured;

[0114] d.4) After the circuit in the rotor assembly amplifies and performs AD conversion on the thermoelectric potential signal in step d.2), a digitized thermoelectric potential value E7 is generated and transmitted to the stator assembly. The computer collects the thermoelectric potential value E8 output by the stator assembly and obtains the corresponding temperature H1 °C;

[0115] At the same time, the temperature measured by the measurement sensor is transmitted to the stator assembly through the rotor assembly, and the computer reads the temperature I1 °C of the stator assembly;

[0116] d.5) Compare the temperature H0 °C with the temperature H1 °C, and the temperature I0 °C with I1 °C. If the differences between H0 °C and H1 °C, and between I0 °C and I1 °C are both within the allowable error range, the reliability of the telemetry instrument at high rotational speed and high temperature is qualified; if not, it is unqualified;

[0117] 3) Reliability determination of the telemetry instrument

[0118] When the reliability of the telemetry instrument is qualified under static normal temperature, static high temperature, low rotational speed and high temperature, and high rotational speed and high temperature, the reliability of the telemetry instrument to be measured is qualified.

[0119] Furthermore, before step 1.1), there is also a step of calibrating the measurement sensor and the reference sensor:

[0120] The standard heat source gives a temperature to the main shaft, the calibration sensor measures the temperature M0 °C of the main shaft. At the same time, the calibrator obtains the temperature M1 °C of the measurement sensor and the temperature M2 °C of the reference sensor respectively, and compares whether the temperatures M1 °C, M2 °C and M0 °C are consistent. If they are consistent, execute step 1.1); if not, replace the measurement sensor and the reference sensor that are inconsistent with M0 °C.

[0121] Compared with the prior art, the advantages of the present invention are:

[0122] 1. The test system of the present invention can simulate a high-temperature and high-rotation-speed operating environment that is almost the same as the actual working environment of the telemetry instrument to be tested, realizing the reliability verification of multiple elements of the telemetry instrument. Before the telemetry instrument is put into use, it can be tested and verified more fully at a lower cost to ensure product quality, improve the test efficiency of users, and ensure the validity of user test data.

[0123] 2. The present invention can calibrate the measurement sensor and the reference sensor through the calibration sensor, improving the reliability of the test.

[0124] 3. The present invention can connect telemetry instruments to be tested with different specifications through the adapter flange, realizing the test of the telemetry instrument under high-speed rotation and high-temperature environment, with a wide range of applications and improving product reliability.

[0125] 4. The test method of the present invention includes static normal-temperature test, static high-temperature test, low-rotation-speed high-temperature test, and high-rotation-speed high-temperature test of the telemetry instrument, simulating the real working environment of the telemetry instrument, conducting sufficient reliability test verification, and determining the accuracy of the reliability test of the telemetry instrument. Description of the Drawings

[0126] Figure 1 is a schematic structural diagram of the test system of the present invention for the reliability of the engine telemetry instrument;

[0127] Among them, the reference numerals are as follows:

[0128] 1 - Fixed platform, 2 - Main shaft, 3 - Measurement sensor, 4 - Reference sensor, 5 - Calibrator, 6 - Standard source, 7 - Rotating mechanism, 8 - Lifting platform, 81 - Frame, 82 - Moving table, 9 - Heating module, 10 - Computer, 11 - Stator assembly, 12 - Rotor assembly, 13 - Slip ring, 14 - Calibration sensor, 15 - Adapter flange. Detailed Embodiments

[0129] The following further describes the content of the present invention in detail with reference to the drawings and specific embodiments.

[0130] The test piece of the present invention is a telemetry instrument applied to the test of rotating components of an aeroengine. The test piece includes a rotor assembly 12 and a stator assembly 11. In actual work, the rotor assembly 12 is installed at one end of the engine turbine shaft and is connected to sensors (such as thermocouples, strain gauges, etc.) on the blade, disk, or shaft through leads to collect and process sensor signals; the stator assembly 11 is coaxially installed opposite to the rotor assembly 12 and there is no contact between the two. The stator assembly 11 supplies power to the rotor assembly 12 through inductive power supply and receives the sensor data collected by the rotor assembly 12 through optical communication.

[0131] Since the rotor assembly 12 is installed at the end of the engine turbine shaft in actual work, the rotor assembly 12 will rotate at high speed with the turbine shaft, bear a large centrifugal load and vibration, and be affected by high temperature radiation and shaft heat conduction, the operating temperature is high, and the reliability requirements of its (rotor assembly) internal electronic circuit and sensor lead interface are high. The reliability of the telemetering instrument plays a vital role in the effectiveness of the engine test. Therefore, the present invention performs a multi-factor reliability test on the telemetering instrument, and can perform a relatively comprehensive test verification on the telemetering instrument at a relatively low cost before the telemetering instrument is delivered for use, so as to ensure the quality of the telemetering instrument and improve the test efficiency.

[0132] like Figure 1 As shown, the present invention is a test system for reliability of engine telemetry instruments, including a fixed platform 1, a main shaft 2, a measuring sensor 3, a reference sensor 4, a slip ring 13, a calibrator 5, a standard source 6, a rotating mechanism 7, a lifting platform 8, a heating module 9 and a computer 10.

[0133] The upper surface of the fixed platform 1 is used to install the stator assembly 11 of the telemetry instrument;

[0134] The spindle 2 is located above the fixed platform 1. The spindle 2 is machined from stainless steel, with a through hole machined at the axis position for lead wiring. A sensor wiring point is reserved in the middle of the spindle 2 for installing the measuring sensor 3 and the reference sensor 4. The lower end of the spindle 2 is coaxially connected with an adapter flange 15, which is used to connect the rotor assembly 12 of the telemetry instrument to be measured. The upper end of the spindle 2 is installed with a slip ring 13, which is a multi-channel high-speed slip ring.

[0135] The measuring sensor 3 and the reference sensor 4 are installed adjacent to each other on the main shaft 2, and the measuring sensor 3 is a K-type thermal couple; the measuring sensor 3 is connected to the electrical signal input of the rotor assembly 12, and is used to provide sensor signal input to the telemetering instrument under test;

[0136] The calibrator 5 is connected to the reference sensor 4 via the slip ring 13; the standard source 6 is connected to the electrical signal input of the rotor assembly 12 via the slip ring 13;

[0137] The rotating mechanism 7 is used to drive the main shaft 2 to rotate. In this embodiment, the rotating mechanism 7 uses an AC synchronous high-speed motor. The output of the high-speed motor is coaxially connected to the main shaft 2, and the speed of the main shaft 2 can be adjusted according to the test requirements. In other embodiments, the high-speed motor can use a dual output shaft, and the slip ring 13 at the upper end of the main shaft 2 is connected to one of the output shafts, and the other output shaft is coaxially connected to the main shaft 2.

[0138] In this embodiment, the lifting platform 8 includes a frame 81 and a moving platform 82 installed on the frame 81 through linear slide rails. A high-speed motor is installed in the middle of the moving platform 82. The moving platform 82 drives the high-speed motor and the main shaft 2 to move up and down as a whole, adjusting the position of the rotor assembly 12 so that the distance between the stator assembly 11 and the rotor assembly 12 meets the test requirements. The frame 81 is assembled by welding aluminum alloy profiles and is used for overall structural support.

[0139] In this embodiment, the heating module 9 is a heater arranged on the outer periphery of the lower part of the rotor assembly 12 and the main shaft 2, used to heat and simulate a high-temperature working environment. The measurement sensor 3 and the reference sensor 4 are located inside the heater, preferably in the upper part of the heater, and the lower end of the rotor assembly 12 extends out of the heater. The heater uses a stainless steel ceramic heating coil. The heater surrounds the measurement sensor 3, the reference sensor 4 and the rotor assembly 12, providing a high-temperature environment through radiation heating. The temperature of the heater is set by a temperature controller.

[0140] The computer 10 is used to be connected to the stator assembly 11 and collect the data output by the stator assembly 11.

[0141] The test system in this embodiment further includes a non-contact calibration sensor 14, which provides a calibration signal for the test system and is used for calibrating the measurement sensor 3 and the reference sensor 4; the calibration sensor 14 uses an infrared temperature sensor and outputs a serial port signal. The temperature measurement point of the calibration sensor 14 is the same as that of the measurement sensor 3. The test system in this embodiment simulates a high-temperature and high-speed operation environment close to the actual working environment of the test piece; provides redundant channel access to the standard source and leads out the sensing signal; uses the calibration sensor to synchronously monitor and compare the test data; and can also have multiple heating modes and multi-temperature zone designs, and can provide different temperature curves for the sensor and the test piece.

[0142] The test process of the above test system for the reliability of the engine telemetry instrument specifically includes the following steps:

[0143] 1) Installation

[0144] 1.1) Connect the measurement sensor 3 to the electrical signal input of the rotor assembly 12, and connect the reference sensor 4 to the calibrator 5 through the slip ring 13;

[0145] 1.2) Install the rotor assembly 12 of the measured telemetry instrument on the adapter flange 15 at the lower end of the main shaft 2, and connect the standard source 6 to the electrical signal input of the rotor assembly 12; install the stator assembly 11 on the fixed platform 1, connect the power supply and connect it to the computer 10 through a signal line, and adjust the stator assembly 11 to align the axes of the stator assembly 11 and the rotor assembly 12;

[0146] 1.3) Adjust the up and down movement of the main shaft 2 through the lifting platform 8 so that the distance between the stator assembly 11 and the rotor assembly 12 meets the test requirements;

[0147] 2) Test

[0148] The test includes static normal temperature test a, static high temperature test b, low speed high temperature test c and high speed high temperature test d;

[0149] Both the measurement sensor 3 and the reference sensor 4 use contact measurement to measure the temperature of the spindle 2. Since their installation positions are basically the same, their output temperature values should be close. The reference sensor 4 outputs through the calibrator 5, and its output result is credible. The measurement sensor 3 outputs through the telemetry instrument. Therefore, it can be compared with the output of the reference sensor 4 to judge whether the telemetry instrument is working properly.

[0150] The static normal temperature test a specifically includes the following steps:

[0151] a.1) Function test

[0152] a.1.1) Give the standard source 6 an output temperature of A0 °C, and the standard source 6 inputs a corresponding thermoelectric potential signal to the rotor assembly 12 through the slip ring 13;

[0153] a.1.2) Power on the measured telemetry instrument. After the circuit in the rotor assembly 12 amplifies and performs AD conversion on the thermoelectric potential signal in step a.1.1), a digital thermoelectric potential value E1 is generated and transmitted to the stator assembly 11. The computer 10 collects the thermoelectric potential value E2 output by the stator assembly 11 and obtains the corresponding temperature A1 °C. Compare the temperature A0 °C and the temperature A1 °C. If the difference between the two is within the allowable error range, execute step a.2); if not, the reliability of the telemetry instrument at static normal temperature is unqualified, and the static normal temperature test a ends;

[0154] a.2) Performance test

[0155] a.2.1) The calibrator 5 reads the temperature B0 °C of the reference sensor 4;

[0156] At the same time, the temperature measured by the measurement sensor 3 is transmitted to the stator assembly 11 through the rotor assembly 12, and the computer 10 reads the temperature B1 °C of the stator assembly 11;

[0157] a.2.2) Compare the temperature B0 °C and B1 °C. If the difference between the two is within the allowable error range, the reliability of the telemetry instrument at static normal temperature is qualified; if not, it is unqualified;

[0158] The static high temperature test b specifically includes the following steps:

[0159] b.1) Construct test conditions

[0160] Turn on the heating module 9 to make the temperature of the rotor assembly 12 in the heating module 9 reach the set high temperature of the test;

[0161] b.2) Functional test

[0162] b.2.1) Give the standard source 6 an output temperature of C0 °C, and the standard source 6 inputs a corresponding thermoelectric potential signal to the rotor assembly 12 through the slip ring 13;

[0163] b.2.2) Power on the telemetry instrument to be tested. After the circuit in the rotor assembly 12 amplifies and performs AD conversion on the thermoelectric potential signal in step b.2.1), a digital thermoelectric potential value E3 is generated and transmitted to the stator assembly 11. The computer 10 collects the thermoelectric potential value E4 output by the stator assembly 11 and obtains the corresponding temperature C1 °C. Compare the temperature C0 °C and the temperature C1 °C. If the difference between the two is within the allowable error range, execute step b.3); otherwise, the reliability of the telemetry instrument under static high temperature is unqualified, and the static high temperature test b ends;

[0164] b.3) Performance test

[0165] b.3.1) The calibrator 5 reads the temperature D0 °C of the reference sensor 4;

[0166] At the same time, the temperature measured by the measurement sensor 3 is transmitted to the stator assembly 11 through the rotor assembly 12, and the computer 10 reads the temperature D1 °C of the stator assembly 11;

[0167] b.3.2) Compare the temperature D0 °C and D1 °C. If the difference between the two is within the allowable error range, the reliability of the telemetry instrument under static high temperature is qualified; otherwise, it is unqualified;

[0168] The low-speed high-temperature test c specifically includes the following steps:

[0169] c.1) Construct test conditions

[0170] Start the rotating mechanism 7 to make the rotational speed of the main shaft 2 reach the set low rotational speed;

[0171] Turn on the heating module 9 to make the temperature of the rotor assembly 12 in the heating module 9 reach the test-set high-temperature temperature;

[0172] c.2) Functional test

[0173] c.2.1) Give the standard source 6 an output temperature of F0 °C, and the standard source 6 inputs a corresponding thermoelectric potential signal to the rotor assembly 12 through the slip ring 13;

[0174] c.2.2) Power on the telemetry instrument under test. After the circuit in the rotor assembly 12 amplifies and performs AD conversion on the thermoelectric potential signal in step c.2.1), a digital thermoelectric potential value E5 is generated and transmitted to the stator assembly 11. The computer 10 collects the thermoelectric potential value E6 output by the stator assembly 11 and obtains the corresponding temperature F1 °C. Compare the temperature F0 °C and the temperature F1 °C. If the difference between the two is within the allowable error range, execute step c.3); if not, the reliability of the telemetry instrument at low speed and high temperature is unqualified, and the low-speed high-temperature test c ends;

[0175] c.3) Performance test

[0176] c.3.1) The calibrator 5 reads the temperature G0 °C of the reference sensor 4;

[0177] At the same time, the temperature measured by the measurement sensor 3 is transmitted to the stator assembly 11 through the rotor assembly 12, and the computer 10 reads the temperature G1 °C of the stator assembly 11;

[0178] c.3.2) Compare the temperature G0 °C and G1 °C. If the difference between the two is within the allowable error range, the reliability of the telemetry instrument at low speed and high temperature is qualified; if not, it is unqualified;

[0179] The high-speed high-temperature test d specifically includes the following steps:

[0180] d.1) Construct test conditions

[0181] Start the rotating mechanism 7 to make the rotational speed of the main shaft 2 reach the set high rotational speed;

[0182] Turn on the heating module 9 to make the temperature of the rotor assembly 12 in the heating module 9 reach the test-set high-temperature;

[0183] d.2) Function test

[0184] d.2.1) Give the standard source 6 an output temperature H0 °C, and the standard source 6 inputs a corresponding thermoelectric potential signal to the rotor assembly 12 through the slip ring 13;

[0185] d.2.2) Power on the telemetry instrument under test. After the circuit in the rotor assembly 12 amplifies and performs AD conversion on the thermoelectric potential signal in step d.2.1), a digital thermoelectric potential value E7 is generated and transmitted to the stator assembly 11. The computer 10 collects the thermoelectric potential value E8 output by the stator assembly 11 and obtains the corresponding temperature H1 °C. Compare the temperature H0 °C and the temperature H1 °C. If the difference between the two is within the allowable error range, execute step d.3); if not, the reliability of the telemetry instrument at high speed and high temperature is unqualified, and the high-speed high-temperature test d ends;

[0186] d.3) Performance test

[0187] d.3.1) The calibrator 5 reads the temperature I0℃ of the reference sensor 4;

[0188] Meanwhile, the temperature measured by the measurement sensor 3 is transmitted to the stator assembly 11 through the rotor assembly 12, and the computer 10 reads the temperature I1℃ of the stator assembly 11;

[0189] c.3.2) Compare the temperatures I0℃ and I1℃. If the difference between the two is within the allowable error range, the reliability of the telemetry instrument at high speed and high temperature is qualified; if not, it is unqualified;

[0190] 3) Judgment of the reliability of the telemetry instrument

[0191] When the reliability of the telemetry instrument is qualified under static normal temperature, static high temperature, low speed high temperature, and high speed high temperature, the reliability of the measured telemetry instrument is qualified.

[0192] To improve the accuracy of the test, before step 1.1), there is step 1.0) for calibrating the measurement sensor 3 and the reference sensor 4, which is specifically as follows:

[0193] The measurement sensor 3 and the reference sensor 4 are respectively connected to the calibrator 5 through the slip ring 13; a standard heat source (not shown in the figure) gives a temperature to the main shaft 2, and the temperature M0℃ of the main shaft 2 is measured by a calibration sensor 14. Meanwhile, the calibrator 5 respectively obtains the temperature M1℃ of the measurement sensor 3 and the temperature M2℃ of the reference sensor 4, and compares whether the temperatures M1℃, M2℃ and M0℃ are consistent. If they are consistent, execute the next step, that is, step 1.1); if not, replace the unqualified sensor, and the unqualified sensor is the measurement sensor 3 or the reference sensor 4 that is inconsistent with the temperature M0℃.

[0194] In this embodiment, the signal input to the rotor assembly 12 of the telemetry instrument is amplified and AD-converted, and then the digitized thermoelectric potential value is sent to the stator assembly 11. The stator assembly 11 sends the data to the computer 10 through the network for display and storage. The rotor assembly 12 can be connected to multiple sensors. In this embodiment, the sensor signals accessed by the rotor assembly 12 are divided into two categories. One category is the measurement sensor 3 (thermocouple) installed on the main shaft 2, which collects the actual temperature of the main shaft 2 and outputs it through the telemetry instrument; the other category is the thermoelectric potential used to simulate the thermocouple output by the standard source 6, and the specific temperature can be set through the program and the corresponding thermoelectric potential can be output to improve the accuracy of the test. In addition, the function of the standard source 6 is that in addition to being able to output a specific temperature value, it can also output a transient signal or a specific waveform to test the response time and linearity of the telemetry instrument.

[0195] Embodiment 2

[0196] The difference from Embodiment 1 is that: the test process of the reliability of the engine telemetry instrument by the test system includes the following steps:

[0197] 1) Installation

[0198] 1.1) Connect the measurement sensor 3 to the electrical signal input of the rotor assembly 12, and connect the reference sensor 4 to the calibrator 5 through the slip ring 13;

[0199] 1.2) Install the rotor assembly 12 of the telemetry instrument under test on the adapter flange 15 at the lower end of the main shaft 2, and connect the standard source 6 to the electrical signal input of the rotor assembly 12; Install the stator assembly 11 on the fixed platform 1, connect the power supply and connect it to the computer 10 through a signal line, and adjust the stator assembly 11 to align the axes of the stator assembly 11 and the rotor assembly 12;

[0200] 1.3) Adjust the up and down movement of the main shaft 2 through the lifting platform 8 to make the distance between the stator assembly 11 and the rotor assembly 12 meet the test requirements;

[0201] 2) Test

[0202] The test includes static normal temperature test a, static high temperature test b, low speed high temperature test c and high speed high temperature test d;

[0203] Both the measurement sensor 3 and the reference sensor 4 use contact measurement to measure the temperature of the main shaft 2. Since the installation positions are basically the same, their output temperature values should be close. The reference sensor 4 outputs through the calibrator 5, and its output result is credible. The measurement sensor 3 outputs through the telemetry instrument. Therefore, it can be compared with the output of the reference sensor 4 to judge whether the telemetry instrument is working properly.

[0204] The specific steps of the static normal temperature test a are as follows:

[0205] a.1) Give the standard source 6 an output temperature of A0 °C, and the standard source 6 inputs a corresponding thermoelectric potential signal to the rotor assembly 12 through the slip ring 13;

[0206] At the same time, the calibrator 5 reads the temperature B0 °C of the reference sensor 4;

[0207] a.2) Power on the telemetry instrument under test;

[0208] a.3) After the circuit in the rotor assembly 12 amplifies and performs AD conversion on the thermoelectric potential signal in step a.1), a digital thermoelectric potential value E1 is generated and transmitted to the stator assembly 11. The computer 10 collects the thermoelectric potential value E2 output by the stator assembly 11 and obtains the corresponding temperature A1 °C;

[0209] At the same time, the temperature measured by the measurement sensor 3 is transmitted to the stator assembly 11 through the rotor assembly 12, and the computer 10 reads the temperature B1 °C of the stator assembly 11;

[0210] a.4) Compare the temperatures A0°C and A1°C, as well as the temperatures B0°C and B1°C. If the differences between A0°C and A1°C, and between B0°C and B1°C are both within the allowable error range, the telemetry instrument is qualified for reliability under static normal temperature; otherwise, it is unqualified.

[0211] The static high-temperature test b specifically includes the following steps:

[0212] b.1) Construct the test conditions

[0213] Turn on the heating module 9 to make the temperature of the rotor assembly 12 in the heating module 9 reach the test-set high temperature.

[0214] b.2) Give the standard source 6 an output temperature of C0°C, and the standard source 6 inputs a corresponding thermoelectric potential signal to the rotor assembly 12 through the slip ring 13.

[0215] At the same time, the calibrator 5 reads the temperature D0°C of the reference sensor 4.

[0216] b.3) Power on the telemetry instrument under test.

[0217] b.4) After the circuit in the rotor assembly 12 amplifies and performs AD conversion on the thermoelectric potential signal in step b.2), a digital thermoelectric potential value E3 is generated and transmitted to the stator assembly 11. The computer 10 collects the thermoelectric potential value E4 output by the stator assembly 11 and obtains the corresponding temperature C1°C.

[0218] At the same time, the temperature measured by the measurement sensor 3 is transmitted through the rotor assembly 12 to the stator assembly 11, and the computer 10 reads the temperature D1°C of the stator assembly 11.

[0219] b.5) Compare the temperatures C0°C and C1°C, as well as the temperatures D0°C and D1°C. If the differences between C0°C and C1°C, and between D0°C and D1°C are both within the allowable error range, the telemetry instrument is qualified for reliability under static high temperature; otherwise, it is unqualified.

[0220] The low-speed high-temperature test c specifically includes the following steps:

[0221] c.1) Construct the test conditions

[0222] Start the rotating mechanism 7 to make the rotational speed of the main shaft 2 reach the set low speed.

[0223] Turn on the heating module 9 to make the temperature of the rotor assembly 12 in the heating module 9 reach the test-set high temperature.

[0224] c.2) Give the standard source 6 an output temperature of F0°C, and the standard source 6 inputs a corresponding thermoelectric potential signal to the rotor assembly 12 through the slip ring 13.

[0225] Meanwhile, the calibrator 5 reads the temperature G0°C of the reference sensor 4;

[0226] c.3) Power on the telemetry instrument under test;

[0227] c.4) After the circuit in the rotor assembly 12 amplifies and performs AD conversion on the thermoelectric potential signal in step c.2), a digital thermoelectric potential value E5 is generated and transmitted to the stator assembly 11. The computer 10 collects the thermoelectric potential value E6 output by the stator assembly 11 and obtains the corresponding temperature F1°C;

[0228] Meanwhile, the temperature measured by the measurement sensor 3 is transmitted through the rotor assembly 12 to the stator assembly 11, and the computer 10 reads the temperature G1°C of the stator assembly 11;

[0229] c.5) Compare the temperature F0°C and the temperature F1°C, and compare the temperature G0°C and G1°C. If the differences between F0°C and F1°C, and between G0°C and G1°C are both within the allowable error range, the reliability of the telemetry instrument at low speed and high temperature is qualified; if not, it is unqualified;

[0230] The high-speed and high-temperature test d specifically includes the following steps:

[0231] d.1) Construct the test conditions

[0232] Start the rotating mechanism 7 to make the rotational speed of the main shaft 2 reach the set high rotational speed;

[0233] Turn on the heating module 9 to make the temperature of the rotor assembly 12 in the heating module 9 reach the test-set high-temperature;

[0234] d.2) Give the standard source 6 an output temperature H0°C, and the standard source 6 inputs a corresponding thermoelectric potential signal to the rotor assembly 12 through the slip ring 13;

[0235] Meanwhile, the calibrator 5 reads the temperature I0°C of the reference sensor 4;

[0236] d.3) Power on the telemetry instrument under test;

[0237] d.4) After the circuit in the rotor assembly 12 amplifies and performs AD conversion on the thermoelectric potential signal in step d.2), a digital thermoelectric potential value E7 is generated and transmitted to the stator assembly 11. The computer 10 collects the thermoelectric potential value E8 output by the stator assembly 11 and obtains the corresponding temperature H1°C;

[0238] Meanwhile, the temperature measured by the measurement sensor 3 is transmitted through the rotor assembly 12 to the stator assembly 11, and the computer 10 reads the temperature I1°C of the stator assembly 11;

[0239] d.5) Compare the temperatures of H0°C and H1°C, and the temperatures of I0°C and I1°C. If the differences between H0°C and H1°C, and between I0°C and I1°C are both within the allowable error range, the telemetry instrument is qualified in terms of reliability under high rotational speed and high temperature; otherwise, it is unqualified.

[0240] 3) Reliability determination of the telemetry instrument

[0241] When the reliability of the telemetry instrument is qualified under static normal temperature, static high temperature, low rotational speed and high temperature, and high rotational speed and high temperature, the reliability of the measured telemetry instrument is qualified.

[0242] To improve the accuracy of the test, before step 1.1), there is also step 1.0) for calibrating the measurement sensor 3 and the reference sensor 4, which is specifically as follows:

[0243] The measurement sensor 3 and the reference sensor 4 are respectively connected to the calibrator 5 through the slip ring 13; the standard heat source gives a temperature to the main shaft 2, and the temperature M0°C of the main shaft 2 is measured through a calibration sensor. At the same time, the calibrator 5 respectively obtains the temperature M1°C of the measurement sensor 3 and the temperature M2°C of the reference sensor 4, and compares whether the temperatures M1°C and M2°C are consistent with M0°C. If they are consistent, proceed to the next step, that is, step 1.1). If not, replace the unqualified sensor, and the unqualified sensor is the measurement sensor 3 or the reference sensor 4 that is inconsistent with the temperature M0°C.

[0244] The above is only a description of the preferred embodiment of the present invention, and does not limit the technical solution of the present invention thereto. Any deformation made by those skilled in the art on the basis of the main technical concept of the present invention belongs to the technical scope to be protected by the present invention.

Claims

1. A test system for the reliability of engine telemetry instruments, characterized in that: It includes a fixed platform (1), a main shaft (2), a measurement sensor (3), a reference sensor (4), a calibrator (5), a standard source (6), a rotating mechanism (7), a lifting platform (8), a heating module (9) and a computer (10); The fixed platform (1) is used for installing the stator assembly (11) of the telemetry instrument; The main shaft (2) is located above the fixed platform (1), the lower end of which is used for installing the rotor assembly (12) of the telemetry instrument, and the upper end is equipped with a slip ring (13); The measurement sensor (3) and the reference sensor (4) are adjacently installed on the main shaft (2), and the measurement sensor (3) is used to be connected to the electrical signal input of the rotor assembly (12); The calibrator (5) is connected to the reference sensor (4) through the slip ring (13); The standard source (6) is connected to the electrical signal input of the rotor assembly (12) through the slip ring (13); The rotating mechanism (7) is used to drive the main shaft (2) to rotate; The lifting platform (8) is used to drive the main shaft (2) to move up and down so that the distance between the stator assembly (11) and the rotor assembly (12) meets the test requirements; The heating module (9) is arranged on the outer periphery of the lower part of the rotor assembly (12) and the main shaft (2), and both the measurement sensor (3) and the reference sensor (4) are located inside the heating module (9), and the lower end of the rotor assembly (12) extends out of the heating module (9); The computer (10) is used to be connected to the stator assembly (11); Give the standard source (6) an output temperature, and the standard source (6) inputs a corresponding thermoelectric potential signal to the rotor assembly (12) through the slip ring (13); after the measured telemetry instrument is powered on, the circuit in the rotor assembly (12) amplifies and performs AD conversion on the thermoelectric potential signal, generates a digital thermoelectric potential value, and transmits it to the stator assembly (11), and the computer (10) collects the thermoelectric potential value output by the stator assembly (11) and obtains the corresponding temperature; the calibrator (5) reads the temperature of the reference sensor (4); at the same time, the temperature measured by the measurement sensor (3) is transmitted to the stator assembly (11) through the rotor assembly (12), and the computer (10) reads the temperature of the stator assembly (11).

2. The test system for the reliability of the engine telemetry instrument according to claim 1, wherein: It further includes a calibration sensor (14) for calibrating the measurement sensor (3) and the reference sensor (4).

3. The test system for the reliability of engine telemetry instruments according to claim 2, characterized in that: The main shaft (2) is of a hollow structure; The heating module (9) is a heater.

4. The test system for the reliability of engine telemetry instruments according to any one of claims 1 to 3, characterized in that: The lower end of the main shaft (2) is provided with an adapter flange (15) for connecting the rotor assembly (12).

5. The test system for the reliability of engine telemetry instruments according to claim 4, characterized in that: The rotating mechanism (7) is a high-speed motor installed on the lifting platform (8), and its output is connected to the main shaft (2).

6. A test method for the reliability of engine telemetry instruments, characterized in that, Adopt the test system for the reliability of the engine telemetry instrument described in claim 1, including the following steps: 1) Installation Adjust the main shaft (2) to move up and down through the lifting platform (8) so that the distance between the stator assembly (11) and the rotor assembly (12) meets the test requirements; 2) Test The test includes a static normal temperature test a, a static high temperature test b, a low speed high temperature test c and a high speed high temperature test d; Each test link includes the following steps: a.1) Function test a.1.1) Give the standard source (6) an output temperature of A0 °C, and the standard source (6) inputs a corresponding thermoelectric potential signal to the rotor assembly (12) through the slip ring (13). a.1.2) Power on the telemetry instrument under test. After the circuit in the rotor assembly (12) amplifies and performs AD conversion on the thermoelectric potential signal in step a.1.1), a digitized thermoelectric potential value E1 is generated and transmitted to the stator assembly (11). The computer (10) collects the thermoelectric potential value E2 output by the stator assembly (11) and obtains the corresponding temperature A1 °C. Compare the temperature A0 °C with the temperature A1 °C. If the difference between the two is within the allowable error range, perform step a.2); otherwise, the static normal temperature test a ends. a.2) Performance test a.2.1) The calibrator (5) reads the temperature B0 °C of the reference sensor (4). At the same time, the temperature measured by the measurement sensor (3) is transmitted to the stator assembly (11) through the rotor assembly (12), and the computer (10) reads the temperature B1 °C of the stator assembly (11). a.2.2) Compare the temperature B0 °C with B1 °C. If the difference between the two is within the allowable error range, the reliability of the telemetry instrument at static normal temperature is qualified; otherwise, it is unqualified. Before steps a.1) of the static high temperature test b, low speed high temperature test c, and high speed high temperature test d, they respectively include step a.0) constructing test conditions, and constructing corresponding test conditions through the heating module or the rotating mechanism. 3) Reliability determination of the telemetry instrument If the reliability of the telemetry instrument at static normal temperature, static high temperature, low speed high temperature, and high speed high temperature is all qualified, the reliability of the telemetry instrument under test is qualified.

7. The test method for the reliability of engine telemetry instruments according to claim 6, characterized in that, Before step 1), it also includes the calibration steps of the measurement sensor (3) and the reference sensor (4): The standard heat source gives the main shaft (2) a temperature, and the calibration sensor (14) measures the temperature M0 °C of the main shaft (2). At the same time, the calibrator (5) respectively obtains the temperature G1 °C of the measurement sensor (3) and the temperature M2 °C of the reference sensor (4). Compare whether the temperatures M1 °C, M2 °C are consistent with M0 °C. If they are consistent, perform step 1); otherwise, replace the measurement sensor (3) and the reference sensor (4) that are inconsistent with M0 °C.

8. A test method for the reliability of engine telemetry instruments, characterized in that, Using the test system for the reliability of the engine telemetry instrument described in claim 1, it includes the following steps: 1) Installation Adjust the up and down movement of the main shaft (2) through the lifting platform (8) so that the distance between the stator assembly (11) and the rotor assembly (12) meets the test requirements. 2) Test The test includes a static normal temperature test a, a static high temperature test b, a low speed high temperature test c, and a high speed high temperature test d. Each test link includes the following steps: a.1) Give the standard source (6) an output temperature of A0 °C, and the standard source (6) inputs a corresponding thermoelectric potential signal to the rotor assembly (12) through the slip ring (13). At the same time, the calibrator (5) reads the temperature B0 °C of the reference sensor (4). a.2) Power on the telemetry instrument under test. a.3) After the circuit in the rotor assembly (12) amplifies and performs AD conversion on the thermoelectric potential signal in step a.1), a digitized thermoelectric potential value E1 is generated and transmitted to the stator assembly (11). The computer (10) collects the thermoelectric potential value E2 output by the stator assembly (11) and obtains the corresponding temperature A1 °C; Meanwhile, the temperature measured by the measurement sensor (3) is transmitted to the stator assembly (11) through the rotor assembly (12), and the computer (10) reads the temperature B1 °C of the stator assembly (11); a.4) Compare the temperatures A0 °C and A1 °C, and the temperatures B0 °C and B1 °C. If the differences between A0 °C and A1 °C, and between B0 °C and B1 °C are both within the allowable error range, the telemetry instrument is qualified in reliability under static normal temperature; otherwise, it is unqualified; Before step a.1), the static high-temperature test b, low-speed high-temperature test c, and high-speed high-temperature test d respectively further include step a.0) constructing test conditions, and constructing corresponding test conditions through the heating module or the rotating mechanism; 3) Reliability determination of the telemetry instrument If the reliability of the telemetry instrument is qualified under static normal temperature, static high temperature, low-speed high temperature, and high-speed high temperature, the reliability of the measured telemetry instrument is qualified.

9. The test method for the reliability of the engine telemetry instrument according to claim 8, characterized in that, Before step 1), there is also a calibration step for the measurement sensor (3) and the reference sensor (4): The standard heat source gives a temperature to the main shaft (2), the calibration sensor (14) measures the temperature M0 °C of the main shaft (2), and meanwhile the calibrator (5) respectively obtains the temperature M1 °C of the measurement sensor (3) and the temperature M2 °C of the reference sensor (4), and compares whether the temperatures M1 °C, M2 °C are consistent with M0 °C. If they are consistent, execute step 1); otherwise, replace the measurement sensor (3) and the reference sensor (4) that are inconsistent with M0 °C.

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