A thermal coupling test system and method dedicated to OEI

Abstract

The present application relates to a kind of OEI special thermal coupling test system and method thereof, for test system, it include: MTS, high-frequency induction heater, temperature controller, high-precision infrared temperature detector, heat exchanger group etc., can realize mechanical load-thermal load synchronous loading.For test method, it include the following steps: S1: select temperature curve and force control loading curve;S2: according to temperature curve and force control loading curve, input the parameter value corresponding to curve in PID controller;S3: by preset PID parameter, control temperature rising process and control force loading process;S4: obtain blade sample final temperature and force loading data chart.The present application is conducive to test obtains the temperature and stress loading of aeroengine turbine component under extreme condition, especially with the function of fast heating and accurate temperature control, provides important technical means for life assessment and verification of aeroengine turbine component under real service condition.

Description

Technical Field

[0001] This invention relates to the field of high-temperature mechanical property testing of materials, and in particular to a thermo-mechanical coupling test system specifically designed for OEI.

[0002] The present invention also relates to a test method based on the above-described test system. Background Technology

[0003] In the event of an engine failure (One Engine Inoperative, OEI) during takeoff of a twin-engine helicopter, as shown in the diagram, the pilot has two options: remain on the platform or apply the OEI regime (red track). In the latter case, the pilot first applies the most stringent 30-second OEI regime until the aircraft regains altitude. Once the aircraft resumes its ascent, a less stringent OEI regime is applied for a maximum duration of 2 minutes (OEI 2min). Finally, once the aircraft reaches cruising altitude, the pilot applies the continuous OEI regime for up to one hour. Figure 8 In the diagram, the arrow trajectory represents the path a helicopter follows during normal takeoff with all engines running.

[0004] To maintain flight capability, the remaining engines must provide additional power under the OEI 30s regime. During this regime, turbine inlet temperatures rise rapidly, and the blades initially experience a sharp temperature jump, potentially 50 to 200°C above normal service temperature, leading to overheating for tens of seconds to tens of minutes. This also increases rotational speed, thereby increasing the mechanical load on the blades, before returning to normal service conditions. In practice, the duration of these regimes is the time required for the aircraft to land or to regain sufficient altitude for a specific mission to operate under a single-engine cruise regime (continuous OEI). The short-term overheating significantly exacerbates blade deformation and creep failure, necessitating analysis and research on turbine blade materials under the OEI 30s regime. These extreme conditions accelerate the microstructural evolution of turbine blades and exacerbate severe degradation of their mechanical properties; therefore, experimental testing is required to simulate the overheating experienced by turbine blades under emergency conditions, with overheating temperatures exceeding 1000°C.

[0005] The existing testing system has the following problems:

[0006] 1. The test simulation device under extremely high temperature conditions can only achieve individual control of temperature or load.

[0007] 2. Existing heat treatment equipment cannot achieve the rate of increase in high temperature and ensure that there is no significant overcharging.

[0008] 3. Existing heat treatment equipment can only achieve thermal simulation of a single temperature value and cannot achieve rapid switching between multiple temperature values. Summary of the Invention

[0009] The purpose of this invention is to provide a turbine blade service simulation test system under the background of single-engine failure of aero-engines, which is conducive to carrying out test tests to simulate the overheating experienced by turbine blades under emergency conditions, and is beneficial to studying the mechanical properties of materials.

[0010] Another object of the present invention is to provide a test method based on the above-described test system.

[0011] Regarding the technical topic of turbine blade service simulation test system under single-engine failure scenario of aero-engines, it includes:

[0012] The PC, which is connected to the MTS, is used to issue control commands and receive data from the MTS.

[0013] A PID controller has a control terminal, a display terminal, and a receiving port. The control terminal includes a thermal control terminal, which is used to input temperature curves and force control curves to simulate the force loading environment during the heating process.

[0014] The MTS has a clamp for holding the blade sample and a thermocouple connection port. After receiving the control command from the PC, the clamp can clamp or release. The clamp is driven by a hydraulic servo force control device to hold the blade sample.

[0015] A high-frequency induction heating device receives control commands from the control terminal of a PID controller and supplies power to an induction coil, which heats the blade sample.

[0016] Thermocouples monitor blade temperature and connect to the corresponding ports of the MTS and PID controllers to feed back temperature data to the MTS and PID controllers. The MTS then feeds back the temperature data to the PC for display.

[0017] A high-precision infrared temperature detector is used to monitor temperature. It has an independent temperature display window and serves as a backup means of monitoring the center temperature of the blade sample, ensuring precise temperature control of the entire test system.

[0018] As a further improvement to the testing system, the MTS fixture is equipped with a heat exchanger assembly for cooling the hydraulic oil of the hydraulic servo force control device.

[0019] As a further improvement to the test system, the heat exchanger assembly also includes a water chiller, which is matched with the induction coil and is internally connected to the induction coil for cooling.

[0020] As a further improvement to the testing system, the MTS is equipped with sensors for monitoring the displacement and strain of the blade specimen. The monitoring data is fed back to the PC and displayed on the PC's display.

[0021] As a further improvement to the test system, the PID controller is used as an emergency controller to stop the high-frequency induction heating device immediately.

[0022] As a further improvement to the testing system, the thermocouple is spot-welded to the blade sample for real-time monitoring of the surface temperature of the blade sample.

[0023] As a further improvement to the test system, the blade sample is located at the center of the induction coil, and the thermodynamic control terminal is an island electric instrument.

[0024] Regarding the technical topic of test methods, the specific steps include:

[0025] S1: Select the heating curve and the corresponding control force loading curve;

[0026] S2: Based on the heating curve and the control force loading curve, input the heating curve and the control force loading curve into the PID controller;

[0027] S3: The heating process and the force loading process are controlled by preset PID parameters through the conductivity meter;

[0028] S4: Obtain the final temperature and force loading data of the blade sample.

[0029] As a further improvement to the experimental method, the following is included:

[0030] The temperature curve and the control force loading curve are segmented lines. On the operation interface of the conductivity meter, each segment is arranged in chronological order, and the time sequence is indicated by the step number. The step number is divided by the flow program number of the PID controller to divide the heating process before the preset temperature and the heating process after the preset temperature.

[0031] The number of heating curves includes 1, 2, and 4, with a maximum number of steps per curve of 8, 16, and 32. The curves are programmable, and each curve includes multiple constant temperature points and heating segments.

[0032] The PID parameter settings include three independent parameters. Any PID parameter can be directly called for the heating stage and the constant temperature point.

[0033] The upper and lower limits of the high-frequency induction heating device are preset and adjustable.

[0034] The parameters on the Shimano's interactive interface are set to be visualized and configured with a stylus, with input method being click input, which can be adjusted at any time;

[0035] The island electric instrument generates a temperature curve based on the input temperature data and corresponding time data, and can query and export it in real time.

[0036] PID parameters include: proportional band, integral time, and derivative time, which can be set appropriately.

[0037] The force loading range is 0–100 kN;

[0038] The maximum temperature of the high-frequency induction heating device is not lower than 1300℃;

[0039] This invention enables experimental testing to simulate the overheating experienced by turbine blades under emergency conditions, with overheating temperatures exceeding 1000°C. This device is suitable for simulating the aforementioned practical engineering problems.

[0040] The following problems can be solved:

[0041] 1. The simulation test of turbine blades can simultaneously meet the requirements of applying loads under extremely high temperature conditions.

[0042] 2. Engine failure often occurs in an instant, so in simulation tests, it is necessary to achieve a high rate of temperature rise in a very short time while avoiding overcharging or keeping overcharging within a margin.

[0043] 3. Single failures may occur multiple times under special circumstances, so it is necessary to achieve the repeatability of the test.

[0044] This invention is beneficial for stress-strain loading of aero-engine turbine components under extreme operating conditions, especially with the functions of rapid heating and precise temperature control. It can also be combined with an aerobic environment for environmental creep testing, providing an important technical means for the life assessment and verification of aero-engine turbine components under real service conditions. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of Example 1.

[0046] Figure 2 This is a schematic diagram of the selected temperature rise curve.

[0047] Figure 3 This is a schematic diagram for inputting temperature curves on the Shimantek instrument.

[0048] Figure 4 This is a schematic diagram of adjusting the parameters of PID number 1 on the island electric instrument.

[0049] Figure 5 This is a schematic diagram of adjusting the parameters of PID number 3 on the island electric instrument.

[0050] Figure 6 This is a schematic diagram of the human-machine interface for the heating process of the island electric instrument.

[0051] Figure 7 This is a schematic diagram of the derived heating process curve.

[0052] Figure 8 This is a schematic diagram of the helicopter's flight path.

[0053] Figure 9 This is a schematic diagram of the control system.

[0054] Figure 10 A schematic diagram of the thermal application conditions.

[0055] Figure 11 This is a schematic diagram of the derived force loading process curve.

[0056] Figure 12 This is the overall circuit diagram of the high-frequency induction heating device.

[0057] Figure 13 This is a circuit diagram for the heating drive of a high-frequency induction heating device.

[0058] Figure 14 This is a picture of a high-frequency induction heating device.

[0059] Figure 15 This is a picture of the actual heat exchange device. Detailed Implementation

[0060] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] Example 1

[0063] like Figure 1-11 As shown, a turbine blade service simulation test system under the single-engine failure scenario of an aero-engine includes:

[0064] The PC, which is connected to the MTS, is used to issue control commands and receive data from the MTS.

[0065] A PID controller has a control terminal, a display terminal, and a receiving port. The control terminal includes a thermal control terminal, which is used to input temperature curves and force control curves to simulate the force loading environment during the heating process.

[0066] The MTS has a clamp for holding the blade sample and a thermocouple connection port. After receiving the control command from the PC, the clamp can clamp or release. The clamp is driven by a hydraulic servo force control device to hold the blade sample.

[0067] A high-frequency induction heating device receives control commands from the control terminal of a PID controller and supplies power to an induction coil, which heats the blade sample.

[0068] Thermocouples monitor blade temperature and connect to the corresponding ports of the MTS and PID controllers to feed back temperature data to the MTS and PID controllers. The MTS then feeds back the temperature data to the PC for display.

[0069] A high-precision infrared temperature detector is used to monitor temperature. It has an independent temperature display window and serves as a backup means of monitoring the center temperature of the blade sample, ensuring precise temperature control of the entire test system.

[0070] In this embodiment, the clamp of the MTS is equipped with a heat exchanger assembly, which is used to cool the hydraulic oil of the hydraulic servo force control device.

[0071] In this embodiment, the heat exchanger group further includes a water chiller, which is matched with the induction coil and is internally connected to the induction coil for cooling.

[0072] In this embodiment, the MTS is equipped with sensors for monitoring the displacement and strain of the blade sample. The monitoring data is fed back to the PC and displayed on the PC's display.

[0073] In this embodiment, the PID controller acts as an emergency controller to bring the high-frequency induction heating device to an emergency stop.

[0074] In this embodiment, the thermocouple is spot-welded to the blade sample for real-time monitoring of the surface temperature of the blade sample.

[0075] In this embodiment, the blade sample is located at the center of the induction coil, and the thermodynamic control terminal is an island electric instrument.

[0076] Example 2

[0077] The test method based on the test system described in Example 1 specifically includes the following steps:

[0078] S1: Select the heating curve and the corresponding control force loading curve;

[0079] S2: Based on the heating curve and the control force loading curve, input the heating curve and the control force loading curve into the PID controller;

[0080] S3: The heating process and the force loading process are controlled by preset PID parameters through the conductivity meter;

[0081] S4: Obtain the final temperature and force loading data of the blade sample.

[0082] As a further improvement to the experimental method, the following is included:

[0083] The temperature curve and the control force loading curve are segmented lines. On the operation interface of the conductivity meter, each segment is arranged in chronological order, and the time sequence is indicated by the step number. The step number is divided by the flow program number of the PID controller to divide the heating process before the preset temperature and the heating process after the preset temperature.

[0084] The number of heating curves includes 1, 2, and 4, with a maximum number of steps per curve of 8, 16, and 32. The curves are programmable, and each curve includes multiple constant temperature points and heating segments.

[0085] The PID parameter settings include three independent parameters. Any PID parameter can be directly called for the heating stage and the constant temperature point.

[0086] The upper and lower limits of the high-frequency induction heating device are preset and adjustable.

[0087] The parameters on the Shimano's interactive interface are set to be visualized and configured with a stylus, with input method being click input, which can be adjusted at any time;

[0088] The island electric instrument generates a temperature curve based on the input temperature data and corresponding time data, and can query and export it in real time.

[0089] PID parameters include: proportional band, integral time, and derivative time, which can be set appropriately.

[0090] The force loading range is 0–100 kN;

[0091] The maximum temperature of the high-frequency induction heating device is not lower than 1300℃;

[0092] Example 3

[0093] I. Device Description, such as Figure 1 As shown:

[0094] 1. PC: Primarily connected to the MTS electro-hydraulic servo mechanical testing system (hereinafter referred to as MTS), controlling the operation of the MTS. Within this system, it controls the up-and-down movement, clamping, and releasing of the MTS clamping end. It can also display real-time data tested by the MTS, such as temperature and displacement.

[0095] 2. PID Controller: This instrument serves as the main temperature control terminal of this rapid heating system, providing a thermocouple connection port for real-time temperature monitoring and display. It offers multiple adjustable parameters during the heating process to ensure accuracy.

[0096] 3. MTS: This testing system is capable of performing various high-precision and high-repeatability durability, fatigue crack propagation, high and low cycle fatigue, and fracture toughness mode tests. It has a wide range of material testing capabilities, including aluminum, composite materials, steel, superalloys, and various parts. In this heating system, it primarily serves as the clamping end for the specimen (its unique water-cooling device ensures that the clamps are not damaged during high-temperature heating). Simultaneously, the MTS provides two thermocouple connection ports for real-time temperature monitoring and display.

[0097] 4. High-frequency induction heating device: Powered by an induction coil, this device efficiently heats various materials. Utilizing the principle of electromagnetic induction, it can quickly and uniformly heat the target object, making it suitable for industrial and related applications. It improves energy efficiency and reduces heating time and resource consumption. Figure 12The circuit schematic of the full-bridge drive assembly for this induction heating device is shown below. Figure 13 Here is the heating drive circuit diagram of the induction heating device, as shown below. Figure 14 The image shown is a physical diagram of the induction heating device.

[0098] 5. Water chiller: This device is connected to the induction coil. During the heating process, water flows through the inside of the induction coil to dissipate heat, preventing the induction coil from melting during heating and heat preservation. Figure 15 This is a picture of the actual water chiller.

[0099] 6. Thermocouple: Temperature measuring device.

[0100] 7. Induction coil: A heating device that can achieve high-temperature heat treatment of samples of different shapes and sizes by independently designing the number of coils and diameter.

[0101] II. Coordination between various devices (and) Figure 1 (corresponding to the serial number):

[0102] 1. PC and MTS: The PC acts as the control terminal of the MTS, controlling the operation of the MTS device and enabling the clamping and loosening of the sample; the thermocouple connection port of the MTS can monitor the sample temperature in real time and transmit the data to the PC for display; the various sensors built into the MTS can also monitor changes in sample displacement, strain, etc., and transmit the data to the PC for display.

[0103] 2. PID and high-frequency induction heating device: The PID control terminal uses real-time temperature data provided by thermocouples to adjust parameters and regulate the power of the induction heating device. It can also be used as an emergency controller to stop the induction heating device in an emergency.

[0104] 3. High-frequency induction heating device and induction coil: connected together, the high-frequency induction heating device functions as an induction coil.

[0105] 4. Induction coil and water chiller: During the heating process, water flows through the inside of the induction coil to dissipate heat and prevent the induction coil from burning out during the heating and heat preservation process.

[0106] 5. Induction coil and sample: Heating.

[0107] 6. Thermocouple and induction coil: Thermocouples monitor the sample surface temperature in real time and transmit the data to the MTS.

[0108] 7. Thermocouple and PID controller: The thermocouple monitors the sample surface temperature in real time and transmits the data to the PID controller.

[0109] 8. Sample and thermocouple: The thermocouple and sample are connected by spot welding. The surface temperature of the sample is monitored in real time during the heating process.

[0110] III. Thermocouple Connection Instructions:

[0111] For real-time temperature testing, multiple thermocouples are typically spot-welded onto the sample to ensure uniform temperature along the sample's axis. The two thermocouple connections of the MTS are used only for temperature monitoring, while the thermocouple connections of the PID controller can both monitor the temperature in real time and adjust the parameters of this temperature signal in real time, transmitting the adjusted parameters to the high-frequency induction heating device to regulate the temperature.

[0112] IV. Examples of rapid heating:

[0113] Select a heating curve, such as Figure 2 As shown:

[0114] Processing steps (simplified to focus only on the heating process):

[0115] 1. Input the temperature curve into the PID controller based on the temperature rise curve, such as... Figure 3 As shown.

[0116] 2. Adjust the PID parameter 1 to ensure stability during the heating process in steps 1-4, such as... Figure 4 As shown.

[0117] 3. Adjust the PID parameter number 3 to ensure stability during the heating process in steps 5 and 6, such as... Figure 5 As shown.

[0118] 4. On the heating process interface, click "Run" to start heating, click "Hold" to maintain the temperature at a certain point during the heating process, and click "Skip" to skip the current step and proceed directly to the next step. Figure 6 As shown.

[0119] 5. Heating stops;

[0120] 6. Export the heating process curve to verify the accuracy of the heating process, such as... Figure 7 As shown.

[0121] The beneficial effects of this embodiment are as follows:

[0122] 1. The number of temperature curves has been increased to 4, with a maximum of 8 steps per curve. The curves are programmable, and multiple constant temperature points and heating segments can be set for a single curve. The number of temperature curves can be changed to 2 or 1, with a maximum of 16 and 32 steps per curve, respectively.

[0123] 2. Multiple PID parameter settings are supported, with a maximum of 3 PID parameters that are independent of each other. Any PID parameter can be directly called for the heating stage and the constant temperature point.

[0124] 3. The upper and lower limits of the heating equipment output are adjustable.

[0125] 4. Configure the instrument human-machine interface. The operation of the temperature controller is cumbersome. By introducing the instrument human-machine interface, all parameters are visualized. It is equipped with a stylus and can be adjusted at any time by clicking and inputting.

[0126] 5. Automatically generates temperature curves; data can be queried and exported in real time.

[0127] 6. When optimizing a specific temperature rise range, the more controllable variables, the more precise the adjustment can be. For example, if the temperature rises too quickly or too slowly, it can be limited by setting upper and lower limits for the heater output. PID parameter adjustment, as the core of the temperature curve, introduces parameters such as proportional band, integral time, and derivative time. Through reasonable parameter settings, the temperature rise curve approaches the theoretical value and exhibits high stability.

[0128] 7. The introduction of thermocouple temperature measurement, along with an independent temperature control system and human-machine interface, complements each other, making the entire system more complete.

[0129] 8. Temperature control is difficult during the heating process above 1000℃. However, since our PID control can be selected in steps, precise temperature control can be achieved by adjusting parameters when the temperature exceeds 1000℃.

[0130] 9. By combining the MTS electro-hydraulic servo mechanical testing system, the force applied to the heat-treated object by the MTS can be controlled during the heating process, while measuring data such as displacement and strain.

[0131] Example 4

[0132] The system in this embodiment is as follows: Figure 9 As shown:

[0133] 1. To meet the load application requirements in the thermal simulation, this system is equipped with a hydraulic servo subsystem.

[0134] 2. To achieve precise heating, precise temperature control is essential. This embodiment employs electromagnetic induction to heat the turbine blade simulator. Furthermore, to enable multi-segment temperature control and rapid temperature value switching, this embodiment utilizes a fast and convenient control system.

[0135] 3. To achieve precise temperature control, it is essential to first achieve precise temperature measurement and real-time temperature data transmission.

[0136] In this embodiment, the device is configured as follows:

[0137] The hydraulic servo force control device can achieve force loading from 0 to 100 kN.

[0138] The hydraulic servo force control device can achieve the clamping conditions of turbine blades in high-temperature environments.

[0139] The electromagnetic induction heating device has three temperature-measuring thermocouples and can meet the requirement of accurate temperature measurement above 1000℃.

[0140] The electromagnetic induction heating device can reach a processing temperature of no less than 1300℃.

[0141] The electromagnetic induction heating device has an interface that can accommodate various electromagnetic induction coils.

[0142] The heat exchanger assembly can cool the hydraulic oil and turbine blade simulation fixture in the hydraulic servo force control device.

[0143] The heat exchanger assembly can cool down the electromagnetic induction coil in the electromagnetic induction heating device.

[0144] The thermal control terminal has three thermocouple data receiving terminals, which can realize the real-time temperature reception of thermocouples.

[0145] The thermal control terminal can automatically switch between multiple temperature rise values ​​in real time.

[0146] The thermal control terminal can control the load application of the hydraulic servo force control system at any time.

[0147] The thermal control terminal can realize real-time control of the power of the electromagnetic induction heating device to achieve a high temperature rise rate and prevent temperature overshoot.

[0148] Thermal application conditions such as Figure 10 As shown:

[0149] Follow these steps to execute:

[0150] The turbine blade simulator is clamped by a hydraulic servo force control device and connected to a thermocouple to ensure that it is located at the center of the induction coil. The temperature-force control curve is input through the thermodynamic control terminal, and the electromagnetic induction heating device starts to heat the simulator. During the heating process, the hydraulic servo force control system is loaded, and the heat exchanger group cools the induction coil clamp.

[0151] Final result (output only data graphs for temperatures above 1000℃ and force loading): [Image of output graph] Figure 7 and Figure 11 As shown.

[0152] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several equivalent substitutions or obvious modifications can be made without departing from the concept of the present invention, and all such modifications, achieving the same performance or purpose, should be considered within the scope of protection of the present invention.

Claims

1. A test method for a dedicated thermo-coupling test system for aero-engine OEI (Outer Energy Interference) systems, characterized in that... in, The test system includes: The PC, which is connected to the MTS, is used to issue control commands and receive data from the MTS. A PID controller has a control terminal, a display terminal, and a receiving port. The control terminal includes a thermal control terminal, which is used to input temperature curves and force control curves to simulate the force loading environment during the heating process. The MTS has a clamp for holding the blade sample and a thermocouple connection port. After receiving the control command from the PC, the clamp can tighten or loosen. The clamp is driven by a hydraulic servo force control device to hold the blade sample. The blade sample is located at the center of the induction coil. The thermoelectric control terminal is a Shida Electric Instrument. A high-frequency induction heating device receives control commands from the control terminal of a PID controller and supplies power to an induction coil, which heats the blade sample. Thermocouples monitor blade temperature and connect to the corresponding ports of the MTS and PID controllers to feed back temperature data to the MTS and PID controllers. The MTS then feeds back the temperature data to the PC for display. A high-precision infrared temperature detector is used to monitor the center temperature of the blade sample and has an independent temperature display window. The test methods include: S1: Select the heating curve and the corresponding control force loading curve; S2: Based on the heating curve and the control force loading curve, input the heating curve and the control force loading curve into the PID controller; S3: Control the heating process and the force loading process by preset PID parameters through the island electric instrument; S4: Obtain the final temperature and force loading data of the blade sample; The temperature curve and the control force loading curve are segmented lines. On the operation interface of the island power supply, each segment is arranged in chronological order, and the time sequence is indicated by the step number. The step number is divided by the flow program number of the PID controller to divide the heating process before the preset temperature and the heating process after the preset temperature. The number of heating curves includes 1, 2, and 4, with a maximum number of steps per curve of 8, 16, and 32. The curves are programmable, and each curve includes multiple constant temperature points and heating segments. The PID parameter settings include three independent parameters. Any PID parameter can be directly called for the heating stage and the constant temperature point. The upper and lower limits of the high-frequency induction heating device are preset and adjustable. The parameters on the Shimano's interactive interface are set to be visualized and configured with a stylus, with input method being click input, which can be adjusted at any time; The island electric instrument generates a temperature curve based on the input temperature data and corresponding time data, and can query and export it in real time. PID parameters include: proportional band, integral time, and derivative time, which can be set appropriately. The force loading range is 0–100 kN; The maximum temperature of the high-frequency induction heating device is not lower than 1300℃; The steps of the controlled heating process in S3 are as follows: 1) Adjust the PID sequence number 1 parameter to ensure the stability of the heating process in steps 1-4; 2) Adjust the PID parameter number 3 to ensure the stability of the heating process in steps 5 and 6; 3) On the heating process interface, click Run to start heating, click Hold to maintain the temperature at a certain point in the heating process, and click Skip to skip the current step number and proceed directly to the next step number; 4) Heating stops; 5) Export the heating process curve to verify the accuracy of the heating process.

2. The test method according to claim 1, characterized in that... The MTS fixture is equipped with a heat exchanger assembly, which is used to cool the hydraulic oil of the hydraulic servo force control device.

3. The test method according to claim 2, characterized in that... The heat exchanger assembly also includes a water chiller, which is matched with the induction coil and is internally connected to the induction coil for cooling.

4. The test method according to claim 1, characterized in that... The MTS is equipped with sensors for monitoring the displacement and strain of the blade sample. The monitoring data is fed back to the PC and displayed on the PC's display.

5. The test method according to claim 1, characterized in that... The PID controller acts as an emergency controller to stop the high-frequency induction heating device immediately.

6. The test method according to claim 1, characterized in that... The thermocouple is spot-welded to the blade sample for real-time monitoring of the blade sample surface temperature.

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