Multi-channel thermocouple temperature compensation method for liquid rocket engine test

Abstract

The invention discloses a multichannel thermocouple temperature compensation method for a liquid rocket engine test, and relates to the technical field of liquid rocket engine tests, and the method comprises the steps: determining the type of a target thermocouple temperature sensor according to the characteristics of a tested object in a to-be-tested liquid rocket engine, and determining a corresponding temperature compensation wire; a target thermocouple temperature sensor is connected with a temperature compensation wire to form an acquisition device; a thermocouple voltage signal and a thermistor voltage signal are acquired in real time through an acquisition device, and the signals are transmitted to a processor based on a wiring terminal in the temperature compensation cabinet; and the thermocouple temperature corresponding to the input data is determined through a preset cold end compensation algorithm in the processor. According to the invention, the precision and reliability of temperature measurement can be improved, the system structure is simplified, the system cost is reduced, and the system is suitable for temperature measurement requirements of multi-channel, high-precision and complex environments in a liquid rocket engine test.

Description

Technical Field

[0001] This invention relates to the field of liquid rocket engine testing technology, and in particular to a method for temperature compensation of multi-channel thermocouples in liquid rocket engine testing. Background Technology

[0002] In liquid rocket engine testing, temperature measurement is a crucial means of obtaining key parameters such as engine performance, combustion efficiency, and structural thermal stress. Thermocouples, as a widely used temperature sensor, are extensively employed in liquid rocket engine testing due to their low cost, simple measurement principle, and versatility. However, traditional thermocouple temperature measurement methods have some drawbacks and limitations, restricting their application in high-precision, multi-channel measurement scenarios.

[0003] Traditional thermocouple temperature measurement is based on the thermoelectric potential generated by the temperature difference between the two ends of a conductor, which is then converted into a temperature value using a calibration table. The prerequisite for using this calibration table is that the cold junction temperature of the thermocouple must be 0 degrees Celsius. To meet this condition, traditional methods typically immerse the cold junction of the thermocouple in an ice-water mixture as a reference zero degree. However, this method has the following problems: The mixture of ice and water is prone to melting and heating, which leads to unstable cold end temperature and introduces measurement errors.

[0004] The water bath method requires high levels of waterproofing and insulation, which increases the complexity and cost of the system.

[0005] When there are many temperature measurement points, using a temperature converter to measure temperature will significantly increase the system cost and system complexity, which is not conducive to large-scale applications. Summary of the Invention

[0006] The technical problem to be solved by this invention is to address the shortcomings of existing technologies, specifically by providing a multi-channel thermocouple temperature compensation method for liquid rocket engine testing, as detailed below: 1) In a first aspect, the present invention provides a method for temperature compensation of multi-channel thermocouples in liquid rocket engine testing, the specific technical solution of which is as follows: Based on the characteristics of the object under test in the liquid rocket engine, the type of target thermocouple temperature sensor is determined, and the corresponding temperature compensation wire is determined according to the type of target thermocouple temperature sensor. The target thermocouple temperature sensor corresponding to the type of target thermocouple temperature sensor is connected to the temperature compensation wire to form a data acquisition device. Thermocouple voltage signals and thermistor voltage signals of any object under test in the liquid rocket engine under test are acquired in real time through at least one acquisition device. Based on at least one reserved terminal in the temperature compensation cabinet, the thermocouple voltage signals and thermistor voltage signals are used as input data and transmitted to the processor. The processor determines the thermocouple temperature corresponding to the input data through a preset cold junction compensation algorithm.

[0007] The beneficial effects of the multi-channel thermocouple temperature compensation method for liquid rocket engine testing provided by this invention are as follows: By selecting the appropriate thermocouple temperature sensor type and its corresponding temperature compensation wires based on the characteristics of the object being measured, the accuracy and reliability of the measurement can be effectively improved, while simplifying the system structure and reducing costs. The collected thermocouple voltage signals and thermistor voltage signals are transmitted to the processor via the terminals in the temperature compensation cabinet. These signals are then processed using a preset cold junction compensation algorithm, achieving real-time compensation of the thermocouple cold junction temperature and thus obtaining accurate thermocouple temperature measurements. This method not only improves measurement accuracy but also enhances the system's stability and adaptability, enabling it to better cope with the complex environmental conditions and varying temperature ranges in liquid rocket engine testing, providing more reliable data support for the performance evaluation and optimization of liquid rocket engines.

[0008] Based on the above solution, the present invention can be further improved as follows.

[0009] Furthermore, the preset cold-end compensation algorithm is as follows: Based on the input data, determine the target cold junction temperature, and combine the correspondence between cold junction temperature and voltage value to determine the target voltage value corresponding to the target cold junction temperature; Based on the target voltage value, and combined with the thermocouple voltage value corresponding to the thermocouple voltage signal, the compensation voltage value is determined, and the thermocouple temperature is determined according to the compensation voltage value.

[0010] The beneficial effects of the above-mentioned further solutions are as follows: By employing a precise cold junction compensation algorithm, the cold junction temperature of the thermocouple can be calculated more accurately, and the compensation voltage value can be determined accordingly, thus achieving high-precision measurement of the thermocouple temperature. This method not only improves measurement accuracy but also enhances the system's adaptability and flexibility, enabling real-time compensation based on different types of thermocouples and varying cold junction temperature conditions, ensuring the reliability of measurement results. Furthermore, implementing cold junction compensation through software algorithms avoids problems associated with traditional methods, such as melting of ice-water mixtures, high cost of temperature transducers, and system complexity, further reducing system cost and complexity, and improving system stability and maintainability. This improved cold junction compensation method is particularly suitable for the multi-channel, high-precision, and complex environment temperature measurement requirements in liquid rocket engine experiments, providing strong support for the smooth conduct of experiments and accurate data acquisition.

[0011] Furthermore, it also includes: Feedback and storage are performed on all thermocouple temperatures determined within a fixed period. At the same time, it monitors the feedback process in real time to check for any abnormalities and generates early warning information when abnormalities are found.

[0012] The beneficial effects of the above-mentioned further solutions are as follows: By periodically feeding back and storing the temperatures of all thermocouples, continuous recording and real-time monitoring of temperature data during liquid rocket engine testing can be achieved, ensuring data integrity and traceability. Simultaneously, real-time monitoring of anomalies during the feedback process and generation of early warning information enable timely detection and handling of potential problems in the measurement system, improving system reliability and safety. This design not only enhances the system's automation and intelligence but also provides test personnel with a timely feedback and early warning mechanism, facilitating rapid response and handling of anomalies, thereby better ensuring the smooth progress of liquid rocket engine testing. Furthermore, this approach allows for further optimization of temperature control strategies during testing, improving test efficiency and data quality.

[0013] Furthermore, it also includes: The target thermocouple temperature sensor type and corresponding temperature compensation wire are updated according to a preset cycle, while retaining the data before the update. After a preset number of updates, delete the data corresponding to the update time that is furthest from the current time.

[0014] The beneficial effects of the above-mentioned further solutions are as follows: By regularly updating the target thermocouple temperature sensor type and its corresponding temperature compensation wires, the performance of the sensor and wires can be ensured to remain at its optimal state, thereby improving the accuracy and reliability of measurements. Simultaneously, retaining the data before the update provides a reference for subsequent data analysis and comparison, facilitating the tracing of historical data and the evaluation of performance changes before and after the update. Furthermore, deleting data corresponding to the update time furthest from the current time effectively manages storage space, avoids data redundancy, and ensures that the stored data remains timely and relevant. This data management approach not only improves the system's operational efficiency but also supports long-term experimental data management and analysis, further enhancing the system's practicality and sustainability.

[0015] 2) In a second aspect, the present invention also provides a multi-channel thermocouple temperature compensation system for liquid rocket engine testing, the specific technical solution of which is as follows: The construction module is used to: determine the type of target thermocouple temperature sensor based on the characteristics of the object under test in the liquid rocket engine under test, and determine the corresponding temperature compensation wire based on the type of target thermocouple temperature sensor; connect the target thermocouple temperature sensor corresponding to the type of target thermocouple temperature sensor with the temperature compensation wire to form a data acquisition device; The compensation module is used to: acquire thermocouple voltage signals and thermistor voltage signals of any object under test in the liquid rocket engine under test in real time through at least one acquisition device, and transmit the thermocouple voltage signals and thermistor voltage signals as input data to the processor based on at least one reserved terminal in the temperature compensation cabinet, and determine the thermocouple temperature corresponding to the input data through a preset cold junction compensation algorithm in the processor.

[0016] Based on the above solution, the present invention can be further improved as follows.

[0017] Furthermore, the preset cold-end compensation algorithm is as follows: Based on the input data, determine the target cold junction temperature, and combine the correspondence between cold junction temperature and voltage value to determine the target voltage value corresponding to the target cold junction temperature; Based on the target voltage value, and combined with the thermocouple voltage value corresponding to the thermocouple voltage signal, the compensation voltage value is determined, and the thermocouple temperature is determined according to the compensation voltage value.

[0018] Furthermore, it also includes: Feedback and storage are performed on all thermocouple temperatures determined within a fixed period. At the same time, it monitors the feedback process in real time to check for any abnormalities and generates early warning information when abnormalities are found.

[0019] Furthermore, it also includes: The target thermocouple temperature sensor type and corresponding temperature compensation wire are updated according to a preset cycle, while retaining the data before the update. After a preset number of updates, delete the data corresponding to the update time that is furthest from the current time.

[0020] 3) In a third aspect, the present invention also provides an electronic device, the electronic device including a processor coupled to a memory, the memory storing at least one computer program, the at least one computer program being loaded and executed by the processor to enable the electronic device to perform any of the methods described above.

[0021] 4) In a fourth aspect, the present invention also provides a computer-readable storage medium storing at least one computer program, which is loaded and executed by a processor to enable a computer to implement any of the above methods.

[0022] It should be noted that the beneficial effects of the technical solutions of the second to fourth aspects of the present invention and their corresponding possible implementations can be found in the above description of the technical effects of the first aspect and its corresponding possible implementations, and will not be repeated here. Attached Figure Description

[0023] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic flowchart of a multi-channel thermocouple temperature compensation method for liquid rocket engine testing according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the model architecture of a multi-channel thermocouple temperature compensation method for liquid rocket engine testing according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the preset cold junction compensation algorithm of a multi-channel thermocouple temperature compensation method for liquid rocket engine testing according to an embodiment of the present invention. Figure 4 This is a structural framework diagram of an electronic device according to the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0025] like Figure 1 As shown in the figure, a method for temperature compensation of multi-channel thermocouples in liquid rocket engine testing according to an embodiment of the present invention includes the following steps: S1. Based on the characteristics of the object under test in the liquid rocket engine, determine the type of target thermocouple temperature sensor, and at the same time determine the corresponding temperature compensation wire based on the type of target thermocouple temperature sensor; connect the target thermocouple temperature sensor corresponding to the type of target thermocouple temperature sensor with the temperature compensation wire to form a data acquisition device. S2, through at least one acquisition device, acquires in real time the thermocouple voltage signal and thermistor voltage signal of any object under test in the liquid rocket engine under test, and transmits the thermocouple voltage signal and thermistor voltage signal as input data to the processor based on at least one reserved terminal in the temperature compensation cabinet, and determines the thermocouple temperature corresponding to the input data through the preset cold junction compensation algorithm in the processor.

[0026] The beneficial effects of the multi-channel thermocouple temperature compensation method for liquid rocket engine testing provided by this invention are as follows: By selecting the appropriate thermocouple temperature sensor type and its corresponding temperature compensation wires based on the characteristics of the object being measured, the accuracy and reliability of the measurement can be effectively improved, while simplifying the system structure and reducing costs. The collected thermocouple voltage signals and thermistor voltage signals are transmitted to the processor via the terminals in the temperature compensation cabinet. These signals are then processed using a preset cold junction compensation algorithm, achieving real-time compensation of the thermocouple cold junction temperature and thus obtaining accurate thermocouple temperature measurements. This method not only improves measurement accuracy but also enhances the system's stability and adaptability, enabling it to better cope with the complex environmental conditions and varying temperature ranges in liquid rocket engine testing, providing more reliable data support for the performance evaluation and optimization of liquid rocket engines.

[0027] It should be noted that, in this scheme, the object under test in the liquid rocket engine refers to the specific temperature measurement part of the liquid rocket engine and its related systems, such as: the combustion chamber wall, injector panel, turbopump housing, gas duct / valve, thrust chamber cooling channel, and propellant tank or delivery pipeline, etc.

[0028] The characteristics of the object under test refer to the operating conditions of the above-mentioned parts, such as temperature range, medium environment, mechanical vibration, thermal shock, chemical corrosion, and electromagnetic interference. Specifically, these include: temperature range (-200℃ to +1000℃ or higher), temperature gradient and transient rate of change, strong vibration, high pressure or vacuum environment, oxidizing / reducing / corrosive gases or propellants, structural space limitations and installation methods (welding, bolting, flexible armor required, etc.).

[0029] Based on these characteristics, selecting the appropriate thermocouple type (T-type copper-constantan for medium and low temperatures, K-type nickel-chromium-nickel-silicon for high-temperature oxidizing environments, etc.) is essential to ensure accurate and reliable measurements and that the lifespan meets the test requirements.

[0030] The target thermocouple temperature sensor type is a specific type of thermocouple selected based on the specific characteristics of the object being measured (such as temperature range, environmental conditions, measurement accuracy requirements, etc.). There are various types of thermocouples, each with its specific material combination, temperature measurement range, and applicable environment. These include, but are not limited to: Type K (nickel-chromium / nickel-silicon), temperature range: -200℃ to +1350℃; Type T (copper / constantan), temperature range: -200℃ to +350℃; Type J (iron / constantan), temperature range: -40℃ to +750℃; Type E (nickel-chromium / constantan), temperature range: -200℃ to +800℃; and Type S (platinum-rhodium 10-platinum), temperature range: 0℃ to +1600℃.

[0031] The selection criteria for the target thermocouple temperature sensor type include: The temperature, environment, and accuracy are determined sequentially, and the specific process is as follows: Temperature range: If the temperature range of the measured part is -200℃ to +350℃, then the type T thermocouple is marked as the optimal choice; if the temperature range is -200℃ to +1350℃, then the type K thermocouple is marked as the optimal choice.

[0032] Environmental conditions: In high-temperature oxidizing environments, type K or type S thermocouples are marked as the optimal choice; while in reducing environments, type J thermocouples are marked as the optimal choice.

[0033] Measurement accuracy: If high accuracy is not required but high sensitivity is needed, the E-type thermocouple is marked as the optimal choice.

[0034] In another embodiment of this solution, the process of determining the temperature compensation conductor includes: First, clearly define the calibration type of the target thermocouple temperature sensor, such as Type K (nickel-chromium / nickel-silicon) or Type T (copper-constantan). Then, based on the determined calibration type, select temperature compensation leads of the exact same material to ensure that no additional thermoelectric potential error is introduced during cold junction compensation due to material mismatch. Specifically, for Type K thermocouples, compensation leads made of nickel-chromium and nickel-silicon alloys should be used; for Type T thermocouples, compensation leads made of copper and constantan are required. These compensation leads will extend from the measuring end of the thermocouple to the terminal block inside the temperature compensation cabinet. Their length is usually determined based on the actual measurement layout; for example, in liquid rocket engine testing, the compensation lead length may be around 15 meters. Throughout the process, the wire diameter, insulation performance, and resistance to environmental factors (such as high temperature resistance and corrosion resistance) of the compensation leads must also be considered to ensure stable operation in complex test environments, thereby guaranteeing the accuracy and reliability of the entire temperature measurement system.

[0035] In another embodiment of this solution, the process of determining the thermocouple temperature corresponding to the input data through a preset cold junction compensation algorithm in the processor is as follows: The process of determining the thermocouple temperature corresponding to the input data using a pre-set cold junction compensation algorithm in the processor is a precise calculation flow. Its core lies in calculating the cold junction temperature in real time based on the acquired thermocouple voltage signal and thermistor voltage signal, and then compensating the thermocouple measurement signal accordingly to obtain an accurate thermocouple temperature value. Specifically, this process first involves acquiring thermocouple voltage signals and thermistor voltage signals from the acquisition device. These two signals reflect the potential difference between the thermocouple measuring end and the cold junction, and the actual temperature of the cold junction, respectively. After receiving this input data, the processor starts the calculation according to the pre-set cold junction compensation algorithm. The algorithm first calculates the actual temperature value of the current cold junction based on the thermistor voltage signal and its calibrated conversion formula. Then, using the calculated cold junction temperature and the thermocouple calibration table, it finds the voltage value corresponding to the cold junction temperature, i.e., the cold junction voltage, through linear interpolation or other suitable mathematical methods. Finally, the acquired thermocouple voltage signal is added to the cold junction voltage to obtain the compensated voltage value. This compensated voltage value reflects the actual potential difference at the thermocouple measuring terminals when the cold junction temperature is assumed to be 0 degrees Celsius. Finally, the compensated voltage value is converted back to the corresponding temperature value using the thermocouple calibration table, which is the desired thermocouple temperature. The entire process is completed with extremely high efficiency in the processor, ensuring the real-time nature and accuracy of the measurement data, thus providing a reliable temperature monitoring method for liquid rocket engine testing.

[0036] Furthermore, the preset cold-end compensation algorithm is as follows: Based on the input data, determine the target cold junction temperature, and combine the correspondence between cold junction temperature and voltage value to determine the target voltage value corresponding to the target cold junction temperature; Based on the target voltage value, and combined with the thermocouple voltage value corresponding to the thermocouple voltage signal, the compensation voltage value is determined, and the thermocouple temperature is determined according to the compensation voltage value.

[0037] It should be further explained that the correspondence between cold junction temperature and voltage value is a reference table for different voltage values ​​corresponding to different cold junction temperatures. The reference table is updated according to a preset cycle.

[0038] The cold junction temperature refers to the actual temperature of the cold junction (i.e., the reference junction) of a thermocouple. The working principle of a thermocouple is based on the Seebeck effect, which states that when two different metals (or semiconductors) form a closed circuit, an electromotive force (thermoelectric potential) is generated in the circuit if there is a temperature difference between the two ends. When measuring temperature, one end (the hot junction) is placed at the temperature to be measured, while the other end (the cold junction) is usually kept at a known reference temperature so that the temperature of the hot junction can be determined by measuring the thermoelectric potential.

[0039] Furthermore, it also includes: Feedback and storage are performed on all thermocouple temperatures determined within a fixed period. At the same time, it monitors the feedback process in real time to check for any abnormalities and generates early warning information when abnormalities are found.

[0040] Furthermore, it also includes: The target thermocouple temperature sensor type and corresponding temperature compensation wire are updated according to a preset cycle, while retaining the data before the update. After a preset number of updates, delete the data corresponding to the update time that is furthest from the current time.

[0041] Example 1, as Figure 2 As shown, it includes thermocouple sensors, thermocouple compensation plugs, thermocouple compensation wires, thermocouple temperature compensation electrical cabinets, terminal blocks, high-precision temperature sensors, measuring cables, signal acquisition and processing equipment, etc.

[0042] Thermocouple temperature sensors can be selected according to the characteristics of the object being measured.

[0043] The temperature changes significantly before and after the liquid rocket engine test. To avoid errors in the transmission of thermocouple sensor signals, it is necessary to use temperature-compensated wires.

[0044] The appropriate size of the explosion-proof electrical cabinet for temperature compensation should be selected based on the number of measuring points and the number of reserved wiring terminals. Appropriate sealing measures should be used for cable inlets and outlets to avoid disturbance of the internal temperature caused by the flow of internal and external air.

[0045] Terminal blocks are mounted inside the cabinet using standard electrical rails. These terminal blocks connect temperature compensation wires and measuring cables. A high-precision thermistor is installed inside the cabinet near the terminal blocks to measure the cold junction temperature of the thermocouples.

[0046] High-precision data acquisition and processing equipment is used to simultaneously acquire thermocouple voltage signals and thermistor voltage signals.

[0047] The software is used to perform cold junction compensation calculations based on the collected data to obtain the temperature and save the data.

[0048] The cold junction compensation calculation process is as follows: The thermistor output signal voltage is collected, and the corresponding temperature is calculated using the sensor conversion formula; the voltage value V is found using the corresponding thermocouple calibration table based on the cold junction temperature. 冷端 The voltage V collected by the thermocouple 热电偶 After the cold junction voltage is compensated, the voltage V 补偿The temperature measurement value is then obtained according to the calibration table; the calculation principle is shown in the diagram below. Depending on the type of thermocouple, the software can simultaneously run according to the corresponding calibration table to obtain the measured temperature value. Other types of sensors can be selected for the cold junction temperature. Depending on the actual application, multiple cold junction temperature sensors can be installed for averaging or backup purposes.

[0049] Example 2, as Figure 3 As shown, in the liquid rocket engine test, a total of 120 signals from 60 T-type and 60 K-type thermocouple temperature sensors were used according to mission requirements.

[0050] To avoid interference from thermal radiation and other factors, and to reduce errors in the thermocouple sensor signal transmission process, a compensation wire of the corresponding temperature type is used to connect to the temperature compensation cabinet. The compensation wire is approximately 15m long. The temperature compensation cabinet is installed at the rear of the vehicle frame to reduce the effects of vibration and thermal radiation.

[0051] The temperature compensation cabinet is installed inside the explosion-proof electrical cabinet with TH35 electrical rails to fix the terminal block. According to the sensor wiring table, connect both ends of the temperature compensation line to the corresponding acquisition channel. The output end of the terminal block is connected to the back-end acquisition equipment using copper measuring cables.

[0052] The cable inlets and outlets of the junction box are filled with foam to prevent the flow of air inside and outside from disturbing the temperature inside the box.

[0053] A high-precision, room-temperature thermistor is attached and fixed to the side of the terminal block. This thermistor is used with the converter and is installed near the compensation cabinet. This prevents the converter's own heat from affecting the internal temperature. After completing the wiring of the terminal block, aluminum foil insulation material is wrapped around the outside.

[0054] The backend acquisition equipment uses a PXIe acquisition system. Voltage signal acquisition uses the PXIe-4303 board, which can acquire ±100mV 24-bit analog signals. The data acquisition and processing software is developed using LabVIEW.

[0055] The cold junction compensation calculation process is as follows: Configure the cold junction temperature sensor channel information and the corresponding sensor type for each thermocouple channel on the acquisition software.

[0056] The data acquisition software obtains the output signal voltage of the thermistor and calculates the temperature according to the conversion formula calibrated by the sensor. After obtaining the cold junction temperature, the voltage value V is found using a T-type thermocouple calibration table for the T-type thermocouple. 冷端 The voltage V collected by each T-type thermocouple 热电偶 Adding the cold junction voltage V 冷端 After compensation, the voltage V 补偿Then, the temperature measurement value is obtained by looking up the T-type thermocouple calibration table. Similarly, the K-type heat treatment method is basically the same as above. The calibration table lookup uses linear interpolation, with a common interval of 1 degree. To improve lookup efficiency, the linear range in the calibration table can be modified to 10 degrees, 5 degrees, and 2 degrees as the lookup interval. In the experiment, the temperature conversion time for 120 signals was less than 60ms, and temperature data was collected using a sampling rate of 10s / s.

[0057] Depending on the type of thermocouple, the software can simultaneously run according to the corresponding calibration table to obtain the measured temperature values. The software's computational efficiency can be further optimized; using NI MAX configuration can improve data processing speed.

[0058] In the above embodiments, although the steps are numbered S1, S2, etc., they are only specific embodiments given by the present invention. Those skilled in the art can adjust the execution order of S1, S2, etc. according to the actual situation, which is also within the protection scope of the present invention. It can be understood that in some embodiments, some or all of the above embodiments may be included.

[0059] This invention also provides a multi-channel thermocouple temperature compensation system for liquid rocket engine testing, the specific technical solution of which is as follows: The construction module is used to: determine the type of target thermocouple temperature sensor based on the characteristics of the object under test in the liquid rocket engine under test, and determine the corresponding temperature compensation wire based on the type of target thermocouple temperature sensor; connect the target thermocouple temperature sensor corresponding to the type of target thermocouple temperature sensor with the temperature compensation wire to form a data acquisition device; The compensation module is used to: acquire thermocouple voltage signals and thermistor voltage signals of any object under test in the liquid rocket engine under test in real time through at least one acquisition device, and transmit the thermocouple voltage signals and thermistor voltage signals as input data to the processor based on at least one reserved terminal in the temperature compensation cabinet, and determine the thermocouple temperature corresponding to the input data through a preset cold junction compensation algorithm in the processor.

[0060] It should be noted that the beneficial effects of the multi-channel thermocouple temperature compensation system for liquid rocket engine testing provided in the above embodiments are the same as those of the multi-channel thermocouple temperature compensation method for liquid rocket engine testing described above, and will not be repeated here. Furthermore, the system provided in the above embodiments is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the system can be divided into different functional modules according to the actual situation to complete all or part of the functions described above. In addition, the system and method embodiments provided in the above embodiments belong to the same concept, and their specific implementation process is detailed in the method embodiments, and will not be repeated here.

[0061] like Figure 4 As shown, an electronic device 300 according to an embodiment of the present invention includes a processor 320 coupled to a memory 310. The memory 310 stores at least one computer program 330, which is loaded and executed by the processor 320 to enable the electronic device 300 to implement any of the above-mentioned methods. Specifically: The electronic device 300 can vary considerably due to differences in configuration or performance. It may include one or more processors 320 (Central Processing Units, CPUs) and one or more memories 310. The memories 310 store at least one computer program 330, which is loaded and executed by the processors 320 to enable the electronic device 300 to implement the multi-channel thermocouple temperature compensation method for liquid rocket engine testing provided in the above embodiment. Of course, the electronic device 300 may also have wired or wireless network interfaces, a keyboard, and input / output interfaces for input and output. It may also include other components for implementing device functions, which will not be elaborated upon here.

[0062] An embodiment of the present invention provides a computer-readable storage medium storing at least one computer program, which is loaded and executed by a processor to enable a computer to implement any of the above-described methods.

[0063] Alternatively, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc read-only memory (CD-ROM), magnetic tape, a floppy disk, and an optical data storage device, etc.

[0064] In an exemplary embodiment, a computer program product or computer program is also provided, which includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform any of the methods described above.

[0065] It should be noted that the terms "first" and "second" in the specification and claims of this application are used to distinguish similar objects and represent a limitation on a specific order or sequence. Where appropriate, the order of use for similar objects can be interchanged so that the embodiments of this application described herein can be implemented in an order other than that shown or described.

[0066] Those skilled in the art will recognize that this invention can be implemented as a system, method, or computer program product. Therefore, this disclosure can be specifically implemented in the following forms: it can be entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of hardware and software, generally referred to herein as a "circuit," "module," or "system." Furthermore, in some embodiments, the invention can also be implemented as a computer program product contained in one or more computer-readable media, which includes computer-readable program code.

[0067] Any combination of one or more computer-readable media may be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0068] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for temperature compensation of multi-channel thermocouples in liquid rocket engine testing, characterized in that, include: Based on the characteristics of the object under test in the liquid rocket engine, determine the type of target thermocouple temperature sensor, and at the same time determine the corresponding temperature compensation wire based on the type of target thermocouple temperature sensor. The target thermocouple temperature sensor corresponding to the target thermocouple temperature sensor type is connected to the temperature compensation wire to form a data acquisition device. Thermocouple voltage signals and thermistor voltage signals of any object under test in the liquid rocket engine under test are acquired in real time through at least one of the acquisition devices. Based on at least one reserved terminal in the temperature compensation cabinet, the thermocouple voltage signals and the thermistor voltage signals are used as input data and transmitted to the processor. The thermocouple temperature corresponding to the input data is determined by a preset cold junction compensation algorithm in the processor.

2. The method for temperature compensation of multi-channel thermocouples in liquid rocket engine testing according to claim 1, characterized in that, The preset cold end compensation algorithm is as follows: Based on the input data, the target cold junction temperature is determined, and the target voltage value corresponding to the target cold junction temperature is determined by combining the correspondence between the cold junction temperature and the voltage value. Based on the target voltage value, and in conjunction with the thermocouple voltage value corresponding to the thermocouple voltage signal, a compensation voltage value is determined, and the thermocouple temperature is determined according to the compensation voltage value.

3. The method for temperature compensation of multi-channel thermocouples in liquid rocket engine testing according to claim 1, characterized in that, Also includes: Feedback and storage are performed on all thermocouple temperatures determined within a fixed period. At the same time, it monitors the feedback process in real time to check for any abnormalities and generates early warning information when abnormalities are found.

4. The method for temperature compensation of multi-channel thermocouples in liquid rocket engine testing according to claim 1, characterized in that, Also includes: The target thermocouple temperature sensor type and corresponding temperature compensation wire are updated according to a preset cycle, while retaining the data before the update. After a preset number of updates, delete the data corresponding to the update time that is furthest from the current time.

5. A multi-channel thermocouple temperature compensation system for liquid rocket engine testing, characterized in that, include: The construction module is used to: determine the type of target thermocouple temperature sensor based on the characteristics of the object under test in the liquid rocket engine under test, and determine the corresponding temperature compensation wire based on the type of target thermocouple temperature sensor; connect the target thermocouple temperature sensor corresponding to the type of target thermocouple temperature sensor with the temperature compensation wire to form a data acquisition device; The compensation module is used to: acquire in real time the thermocouple voltage signal and thermistor voltage signal of any object under test in the liquid rocket engine under test through at least one of the acquisition devices, and transmit the thermocouple voltage signal and the thermistor voltage signal as input data to the processor based on at least one reserved terminal in the temperature compensation cabinet, and determine the thermocouple temperature corresponding to the input data through a preset cold junction compensation algorithm in the processor.

6. The multi-channel thermocouple temperature compensation system for liquid rocket engine testing according to claim 5, characterized in that, The preset cold end compensation algorithm is as follows: Based on the input data, the target cold junction temperature is determined, and the target voltage value corresponding to the target cold junction temperature is determined by combining the correspondence between the cold junction temperature and the voltage value. Based on the target voltage value, and in conjunction with the thermocouple voltage value corresponding to the thermocouple voltage signal, a compensation voltage value is determined, and the thermocouple temperature is determined according to the compensation voltage value.

7. A multi-channel thermocouple temperature compensation system for liquid rocket engine testing according to claim 5, characterized in that, Also includes: Feedback and storage are performed on all thermocouple temperatures determined within a fixed period. At the same time, it monitors the feedback process in real time to check for any abnormalities and generates early warning information when abnormalities are found.

8. A multi-channel thermocouple temperature compensation system for liquid rocket engine testing according to claim 5, characterized in that, Also includes: The target thermocouple temperature sensor type and corresponding temperature compensation wire are updated according to a preset cycle, while retaining the data before the update. After a preset number of updates, delete the data corresponding to the update time that is furthest from the current time.

9. An electronic device, characterized in that, The electronic device includes a processor coupled to a memory storing at least one computer program, which is loaded and executed by the processor to enable the electronic device to perform the method as described in any one of claims 1 to 4.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one computer program, which is loaded and executed by a processor to enable the computer to perform the method as described in any one of claims 1 to 4.

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