NL2034174B1 - Dry ice type temperature control system and method of modem for ground test of rotor system - Google Patents

Dry ice type temperature control system and method of modem for ground test of rotor system Download PDF

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Publication number
NL2034174B1
NL2034174B1 NL2034174A NL2034174A NL2034174B1 NL 2034174 B1 NL2034174 B1 NL 2034174B1 NL 2034174 A NL2034174 A NL 2034174A NL 2034174 A NL2034174 A NL 2034174A NL 2034174 B1 NL2034174 B1 NL 2034174B1
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Prior art keywords
temperature
dry ice
control system
function
difference
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NL2034174A
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Dutch (nl)
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NL2034174A (en
Inventor
Zhang Yongjie
Luo Guisen
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Univ Northwestern Polytechnical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
    • B64F5/60—Testing or inspecting aircraft components or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/12—Devices using other cold materials; Devices using cold-storage bodies using solidified gases, e.g. carbon-dioxide snow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
    • G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
    • G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1917—Control of temperature characterised by the use of electric means using digital means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Transportation (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Control Of Temperature (AREA)

Abstract

The invention provides a dry ice type temperature control system of a modem for a ground test of a rotor system and a method thereof, the dry ice is used as a cold source, no additional energy is needed, the power output burden of the helicopter in the 5 air without ground support and guarantee is reduced, the temperature control method is used for monitoring the temperature of the dry ice in real time, the refrigerating fan can be adjusted in real time according to the temperature of the dry ice, the temperature adjusting process is smooth, and an ideal lO refrigerating effect can be achieved. (+ Fig. 7)

Description

DRY ICE TYPE TEMPERATURE CONTROL SYSTEM AND METHOD OF MODEM FOR
GROUND TEST OF ROTOR SYSTEM
Technical field
The invention belongs to the technical field of temperature control of electric control test equipment, and particularly re- lates to a dry ice type temperature control system and method of a modem for ground test of a rotor system.
Background technology
Rotor is the core component to provide power and control for helicopter, and the dynamic monitoring of blade structure load is the main basis for the dynamic characteristics analysis and blade design verification of rotor blade, which directly affects the strength, performance and flight characteristics of helicopter.
Rotor blade dynamic load test has the characteristics of complex distribution, large range, dense measuring points, sensitive to added mass, high dynamic response, and in the complex environment of rotation and vibration. How to monitor the dynamic load of the blade in the flight state and analyze and evaluate its operation state in real time is the key point of helicopter measurement technology. The rotor blade bending moment is an important parame- ter to identify the blade structural loads, so it is very im- portant to measure the dynamic bending moment of the rotor blade in real time and realize the dynamic monitoring of the blade structural loads.
The traditional rotor load test uses electrical sensors to obtain measurement data, which has a low signal-to-noise ratio and seriously affects the accuracy of rotor load identification; it needs to paste a large number of strain gauges to connect a large number of transmission wires, which will destroy the smoothness and structure of the blade surface when measuring at multiple points on the composite blade surface, resulting in a larger added mass and affecting the aerodynamic flight characteristics of the blade. Fiber Bragg grating sensor has the advantages of small size, light weight, electrical insulation, anti-electromagnetic interference, high precision, high reliability, and high sensitiv- ity of fiber grating, easy to achieve high efficiency of distrib- uted measurement, which breaks through the limitations of tradi- tional measurement methods based on electrical sensors. The fiber grating sensor can directly measure the strain, temperature, vi- bration and other physical quantities, which reduces the complexi- ty of the system, simplifies the system structure, and is conven- ient to monitor the maintenance characteristics of the system it- self.
However, due to the process limitations and principle charac- teristics of the existing photoelectric devices, the working tem- perature range of optical devices or photo-electronic equipment is relatively narrow. The working temperature range of the demodula- tor in the fiber grating demodulation system used in this experi- ment is -20 °C ~ 60 °C. However, the service condition of the rotor is —45 °C ~ 75 °C, as the demodulator can not work at low or high temperature, a thermostat is needed to ensure the normal operation of the equipment. In the aerial test of the helicopter, the volume and weight of the thermostat of the demodulator must be strictly controlled. The demodulator must be installed in the fairing on the top of the helicopter, so the thermostat must have the charac- teristics of small volume, light weight, and good constant temper- ature effect. In the aerial test of helicopter, the power supply provided by the helicopter for the thermal insulation device is low. Using dry ice as a cold source can effectively reduce the de- mand for energy supply.
Rotor is the core component to provide power and control for helicopter, and the dynamic monitoring of blade structure load is the main basis for the dynamic characteristics analysis and blade design verification of rotor blade, which directly affects the strength, performance and flight characteristics of helicopter.
Rotor blade dynamic load test has the characteristics of complex distribution, large range, dense measuring points, sensitive to added mass, high dynamic response, and in the complex environment of rotation and vibration. How to monitor the dynamic load of the blade in the flight state and analyze and evaluate its operation state in real time is the key point of helicopter measurement technology. The rotor blade bending moment is an important parame- ter to identify the blade structural loads, so it is very im- portant to measure the dynamic bending moment of the rotor blade in real time and realize the dynamic monitoring of the blade structural loads.
The traditional rotor load test uses electrical sensors to obtain measurement data, which has a low signal-to-noise ratio and seriously affects the accuracy of rotor load identification; it needs to paste a large number of strain gauges to connect a large number of transmission wires, which will destroy the smoothness and structure of the blade surface when measuring at multiple points on the composite blade surface, resulting in a large addi- tional mass and affecting the aerodynamic flight characteristics of the blade. Fiber Bragg grating sensor has the advantages of small size, light weight, electrical insulation, anti- electromagnetic interference, high precision, high reliability, and high sensitivity of fiber grating, easy to achieve high effi- ciency of distributed measurement, which breaks through the limi- tations of traditional measurement methods based on electrical sensors. And the fiber grating sensor can directly measure a plu- rality of physical quantities such as strain, speed, vibration and the like, thereby reducing the complexity of the system, simplify- ing the structure of the system and being convenient for monitor- ing the maintenance characteristics of the system.
The air dynamic test method is used, and the harsh high and low temperature environment puts forward requirements for the fi- ber grating demodulator. Due to the process limitation and princi- ple characteristics of the existing photo-electronic devices, the working temperature range of optical devices or photo-electronic equipment is relatively narrow. The working temperature range of the demodulator in the fiber grating demodulation system used in this test is -20 °C ~ 60 °C. At the same time, the protection equipment of fiber grating demodulator should consume as little energy as possible when the helicopter loses the ground support in the air test process. Therefore, it is more suitable to use dry ice as a cold source. The traditional temperature control method directly controls the refrigeration and heating device to directly carry out refrigeration or heating to adjust the temperature through the feedback of the temperature sensor. For the refrigera- tion equipment with dry ice as the cold source, the refrigeration efficiency is changing all the time. If the traditicnal tempera- ture control method is used, the time span of temperature adjust- ment will be longer and the response will not be timely. The tem- perature of the helicopter changes dramatically in the process of movement, so it is necessary to adjust the internal temperature according to the external environment in time.
Summary of the invention
The object of the present invention is to overcome the above problems in the prior technology, and to provide a dry ice type temperature control system and method for a modem for a ground test of a rotor system. The dry ice type temperature control sys- tem is simple in structure, small in size, light in weight, and convenient to extend the working temperature range of a fiber grating demodulator, which is the main device of the fiber grating demodulation system. The dry ice is used as a cold source, no ad- ditional energy is needed, the power output burden of the helicop- ter in the air without ground support and guarantee is reduced, the temperature control method is used for monitoring the tempera- ture of the dry ice in real time, the refrigerating fan can be ad- justed in real time according to the temperature of the dry ice, the temperature adjusting process is smooth, and an ideal refrig- erating effect can be achieved.
According to the technical scheme, the dry ice type tempera- ture control system of the modem for the ground test of the rotor wing system comprises a dry ice portable incubator, a fiber Bragg grating demodulator and a control system, wherein a dry ice cham- ber and an equipment chamber are arranged in the incubator, a par- tition board is arranged between the dry ice chamber and the equipment chamber to isolate air flow in the two spaces, and a cold air fan is arranged on the partition board; A first tempera- ture sensor is arranged in the equipment chamber; a second temper- ature sensor is arranged in the dry ice chamber; the fiber grating demodulator is arranged in an equipment chamber; a control system is arranged on an insulating layer arranged on the side wall of the equipment chamber; and the fiber grating demodulator is con- nected with a fiber grating signal input line, and the fiber grat- ing signal input line is connected with a fiber grating tempera- ture sensor arranged on the outer wall of a constant temperature 5 box.
The dry ice chamber and the equipment chamber are positioned in the PU plastic shell, and the insulation layer is positioned between the side wall of the equipment chamber and the PU plastic shell, which is a polyurethane insulation layer.
The fiber grating demodulator is arranged in the equipment room through a fixing clamp.
The invention relates to a temperature control method of a dry ice type temperature control system of a modem for ground test of a rotor system, which comprises the following steps: 1) Detecting the temperature data of each area according to a predetermined period, wherein the area comprises an outer area of a thermotank corresponding to each grating in each fiber grating temperature sensor string, an equipment room corresponding to a first temperature sensor, and a dry ice room corresponding to a second temperature sensor; Wherein the first temperature sensor (13) corresponds to a temperature value Aof an equipment room (11) inside the incubator, wherein the temperature valueAis a tempera- ture collected at each time node; The second temperature sensor (26) corresponds to a temperature valueD of the dry ice chamber (3) inside the incubator, wherein the temperature valueD is a tem- perature collected at each time node; The optical fiber grating temperature sensor (27) corresponds to that external surface tem- perature of the constant temperature box; the control system (12) collects the temperature values detected by each temperature sen- sor according to a predetermined period, wherein the information collected by The optical fiber grating temperature sensors is ana- lyzed and processed by the optical fiber grating demodulation in- strument (14) to obtain a plurality of temperature valuesBy(N = 1, 2.. , 20), N is the number of gratings in the fiber grating tem- perature sensor (27); 2) When that signal of the resistance type temperature sensor is received at each moment, the control system (12) judges the temperature value Ainside the equipment chamber of the constant temperature box, when A is more than 60 deg C or less than -20 deg
C, an alarm is sent out, and an alarm indicator lamp is on; 3) The method to obtain that heat transfer coefficients of the outer wall of the correspond thermotank in each grating tem- perature sensor (27) to the internal environment of the equipment comprises the following steps: heating or refrigerating a position where a grating temperature sensor is arranged on the outer sur- face of the thermotank when the temperatures inside and outside the thermotank are the same, measuring the surface temperature of the same part of the inner and outer walls of the thermotank, and subtracting the absolute value of the inner and outer tempera- tures, wherein the absolute value is the heat transfer coeffi- cient; 4) Setting the target temperature value Swhich needs to be kept in the constant temperature box, wherein the temperature val- ue of S is more than 20 deg C below zero and less than 60 deg C; 5) Determining the cooling efficiencygof the cooling fan; The refrigerating efficiency is determined according to the change of the temperature valueD in the dry ice chamber and is the ratio g= Dor the temperature difference between the dry ice chamber and the equipment chamber at the current moment to the starting moment, and the initial temperature of the dry ice room is -20 deg
C, D is more than -20 and less than A, and g is more than 0 and less than 1; 6) Determining the first difference function elt} = —4 be- tween the temperature in the equipment chamber of the thermostat and the target temperature, wherein the first difference function is a function of the difference between the temperature value A in the equipment chamber of the thermostat and the target temperature value S changing with time; f(t) = § ZO, The method for calculat- ing the second difference function comprises the following steps: firstly obtaining the average value of the temperature value By of each grating temperature sensor multiplied by the corresponding heat transfer coefficiently, wherein the function of the differ- ence between the average value and the target temperature with re- spect to time is the second difference function, and N is the num- ber of outer wall temperature sensors; 7) Determining the first output function by the first differ- ence function, and obtaining the first output function by the ac- cumulation of proportional integral calculation, integral calcula-
PD = Held FE, | {Thr + Ky — tion and differential calculation; 4 ui ; where, Ky e(Dis the proportional integral calculation, that is, the function e(t) of the temperature difference between the inside and outside of the incubator at time t is multiplied by a proportional gainKp, Ky = 0.65K, K¢is the minimum value as far as the steady-state error of the control system (12) reaches PIDe) = Kcelt) under the condition that only proportional link control is adopted; the speed of the thermostat reaching the target temperature can be controlled by adjusting the value of Kp, and the higher of the value of Kp is, the higher the speed of approaching the target temperature is; In the integral calculation step K; [, e(t)dt , namely, consider- ing the past error, integrate the first difference function from the beginning to the current time and multiply the first differ- ence function by an integral gain Ki,Ki= Kp + wherein t is a PID control sampling calculation period andT; an integral time of the control system (12); In the differential calculation step Ke =, calculate the first derivative of the first difference function in consideration of the upcoming error, and multiply the first deriv- ative by a positive constantKa, Kg = Kp +22 wherein t is the differ- ential time of the control system (12), and the three parameters are all adaptive parameters and are greater than O;tis the inde- pendent variable of the time changes; 8) Determining a second output function from the second dif- ference function; A second output function
Pile = Kp fA +E, If {rds + Ky are
Tr ‘9 ZE js obtained through the accumulation of a proportional calculation, an integral calculation and a dif- ferential calculation, wherein the proportional calculation, the integral calculation and the differential calculation are all ob- tained based on the second difference function f(t), the meaning and the method are the same as those of the first output function, and the three calculation links and parameter actions are the same as those of the first output function; 9) Determining an output function; wherein the output func- tion p(t) is obtained by adding the first function and the second function, wherein the output function p(t) isp(t) = aPIDe) + BPIDgy), wherexandfare the fitting parameters of the first output function and the second output function respectively; wherea = |=, p= |E, 0 <a< 1, OD <B< 1,ais the proportional parameter corresponding to the internal ambient temperature difference of the equipment room and the maximum temperature difference of 40 °C.eis the temperature difference between the current internal ambient temperature of the equipment chamber of the incubator and the set target temperature when the system (12) samples, when the change range of the inter- nal ambient temperature of the equipment chamber is below -40 deg
C or abovea770 deg C, 1 is taken, and when the internal ambient temperature in the equipment chamber is the same as the target temperature,dtakes 0; Bisa proportional parameter corresponding to the external ambient temperature difference and the maximum tem- perature difference of 55 deg C, f is the temperature difference between the current external ambient temperature and the set tar- get temperature when the control system (12) is used for sampling, when the variation range of the external ambient temperature is below minus 20 deg C and above 60 deg C, Bis taken as 1, when the external ambient temperature is the same as the target tempera- ture,Bis taken as 0.
The total output function isy(t) = p(t) *xg,y =0, which is ob- tained by multiplying the output functionp(t) by the refrigeration efficiencyg, the purpose is to compensate for the weakening of the refrigeration effect of dry ice by increasing the fan output in the process of temperature change in the dry ice chamber;
10) The control system drives the cooling fan to rotate ac- cording to the total outputy(t); By adjusting the fan voltage, the fan speed is adjusted to deliver the cold air in the dry ice room to the equipment room, so as to reduce the ambient temperature in the equipment room.
The beneficial effects of the invention lies that it disclos- es a dry ice type temperature control system and a dry ice type temperature control method of the modem for the ground test of a rotor system.
The dry ice type temperature control system has the following beneficial effects: 1. The working temperature range of the demodulator of the fiber grating demodulation system is from -20 °C to 60 °C, and the service environment of the device is from -45 °C to 75 °C, so the present invention provides a constant temperature device for ex- panding the working temperature range of the fiber grating demodu- lator. 2. In the aerial test of the helicopter, the demodulator is located in the fairing on the top of the helicopter rotor. Under this condition, the demodulator will be affected by the rotation and vibration of the rotor movement, so the demodulator needs not only a suitable temperature working environment, but also a fixed device to prevent the collision damage of the demodulator. The ex- isting demodulator heat preservation device adopts a semiconductor refrigeration mode to maintain the temperature fluctuation in a constant temperature box, and has a large volume; because the fairing on the top of the helicopter is small, the device cannot be used for the air test of the helicopter rotor; and the device adopts a dry ice refrigeration mode to control the temperature in the constant temperature box, and has the advantages of small vol- ume and light weight. 3. The existing demodulator heat preservation device uses the semiconductor refrigeration mode to maintain the temperature fluc- tuation in the thermostat, when the ambient temperature is high, the refrigeration efficiency of the semiconductor refrigeration device will decrease for a long time, and finally the thermostat can not maintain the specified working temperature, the device can add dry ice according to the working hours of the demodulator, so that the temperature in the thermostat can be maintained within the working temperature range. 4. The existing demodulator insulation device does not take measures to fix the demodulator, so that the existing thermostat can only be used in the static test environment on the ground, and can not be used in the dynamic test in the air. Therefore, the in- vention provides a device for fixing a fiber grating demodulator, so that the device has the capability of air dynamic test. 5. The existing thermostat of the demodulator adjusts the cooling or heating to keep the temperature of the internal envi- ronment stable according to the change of the temperature signal of the internal environment, which has the problems of untimely adjustment and large fluctuation of the internal temperature. Ac- cording to the internal and external temperature signals, the de- vice demodulates the analysis signal and inputs it into the con- trol system, and calculates the required cooling capacity to bal- ance the external and internal influences by using PID algorithm.
At the same time, the cooling capacity is determined by the tem- perature sensor of the dry ice room, so as to adjust the fan speed to control the internal temperature of the equipment room.
The temperature control method of the dry ice type tempera- ture control system of the invention has the following technical advantages:
According to the invention, an active constant temperature control method is adopted, and the fiber grating demodulation in- strument is a part of the control system and provides temperature parameters outside the constant temperature box for the control system; and refrigeration or heating power is actively controlled in advance, so that the constant temperature efficiency is im- proved, the service time is prolonged, and the temperature fluctu- ation in an equipment room is reduced. The device solves the prob- lem that the temperature of the constant temperature box fluctu- ates violently in the adjusting process under the conditions of external high and low temperature environment and internal heating by firstly independently calculating the required output of inter-
nal and external temperature variables and then synthesizing the required output. At the same time, according to the temperature difference between the dry ice room and the equipment room, the speed of the cold air fan is adjusted at any time to ensure the refrigeration power.
According to the invention, an active constant temperature control method is adopted, a fiber grating demodulator is used as a part of a control system, and the fiber grating demodulator is used for analyzing signals of a fiber grating sensor outside a constant temperature box and outputting a function f£ (t) of exter- nal temperature change; And the temperature control system is used for adjusting the refrigerating power according to the f (t) to counteract the influence of the external environment of the con- stant temperature box on the fiber grating demodulator. The tem- perature sensor in the equipment room provides the internal tem- perature information of the equipment room, and the internal tem- perature of the equipment room outputs a function e (t); And ac- cording to the e (t), the control system eliminates the influence caused by the self-generated heat of the fiber grating demodulator in the constant temperature box equipment room. A temperature sen- sor in that dry ice chamber provides the temperature information of the dry ice chamber; the output efficiency of the temperature of the dry ice chamber is G; A temperature control system (12) in- creases or decreases the rotational speed of a fan accord toy(t), so as to achieve the best refrigeration efficiency; and the usage time is prolonged, and the temperature fluctuation in the equip- ment chamber is reduced. The device solves the problem that the temperature of the thermostat fluctuates violently in the adjust- ment process under the conditions of external high and low temper- ature environment and internal heating by firstly independently calculating the required output of the internal and external tem- perature variables and then synthesizing the required output. At the same time, according to the temperature change in the dry ice chamber, the fan speed is reasonably adjusted to maintain the re- frigeration power in a reasonable range and prolong the service life of the equipment.
Description of attached drawings
Fig. 1 is a schematic diagram of the external structure of the dry ice portable incubator of the present invention;
Fig. 2 is a distribution diagram of the internal structure of the dry ice portable incubator of the present invention;
Fig. 3 is a schematic diagram of the internal structure of the dry ice portable incubator of the present invention;
Fig. 4 is a structural diagram 1 of the fixing fixture of the present invention;
Fig. 5 is a structural diagram 2 of the fixing fixture of the present invention;
Fig. 6 is a temperature control flow of the temperature con- trol system of the present invention;
Fig. 7 is a schematic block diagram of the control relation- ship of the temperature control system of the present invention.
In the figure: PU plastic shell 1, polyurethane insulation layer 2, dry ice chamber 3, fan 4, partition board 5, fiber grat- ing signal line 6, network cable 7, fiber grating demodulator pow- er line 8, control system power line 9, implementation hole 10, equipment chamber 11, control system 12, first temperature sensor 13, fiber grating demodulator 14, thermostat cover 15, buckle 16, a hinge 17, a temperature alarm lamp 18, a fixing clamp 19, a lug 20, a nut 21, a heat insulating pad 22, a limiting column 23, a lug support 24, a bottom plate 25, a second temperature sensor 26, and a fiber grating temperature sensor 27.
Specific embodiments
One embodiment of the present invention will be described in detail below with reference to the drawings, but it should be un- derstood that the scope of the present invention is not limited by the specific embodiment.
In the description of the present invention, it is to be un- derstood that, the orientation or positional relationship of the terms "center", "longitudinal" , "transverse", "length", "width"," thickness”, "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axi- al", "radial" and so on are indicated by "circumferential direc- tion" and the like is based on the orientation or positional rela-
tionship shown in the drawings, which is only for the convenience of describing the technical scheme of the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orienta- tion, be constructed and operate in a specific orientation, so it should not be understood as a limitation to the present invention.
Referring to figs. 1 to 7, an embodiment of the present in- vention provides a dry ice type temperature control system and method of a modem for ground test of a rotor system.
The invention provides a modem dry ice type temperature con- trol system for a ground test of a rotor system, which comprises a dry ice portable constant temperature box, wherein a box body shell is made of PU plastic, and a polyurethane insulating layer 2 is filled between the shell and an inner cavity; A first tempera- ture sensor 13 is arranged in the equipment chamber; A second tem- perature sensor 26 is arranged in the dry ice chamber; A fiber grating demodulator 14 is placed in the equipment chamber 11 and is fixed by a fixing clamp 19; The bottom of the constant tempera- ture box is provided with four fixing clamps 19 which are connect- ed with the constant temperature box through nuts 21, and the cov- er of the constant temperature tank is provided with four fixing clamps 19 which are connected with the cover 15 of the same through nuts; The fixing clamp 19 consists of a lug 20, a nut 21, a heat insulation pad 22, a limiting column 23, a lug supporting column 24 and a bottom plate 25, wherein the lug 20 is provided with a central shaft, the lug supporting column 24 is provided with a rotating hole, the central shaft of the lug 20 is arranged in the rotating hole, and the limiting column 23 is arranged at the bottom of the lug 20. A lug support 20 and a limiting post 23 are welded on a bottom plate 25, and a heat insulation pad 22 is laid on the surface of the lug 20; a control system 12 is in- stalled in a heat insulation layer 2 between an equipment chamber 11 and an outer shell 1; and a fiber grating demodulator 14 is connected with a fiber grating signal wire 6, a network cable 7 and a fiber grating demodulator power wire 8, and the power wire 9 of the control system is connected with the outside through an im- plementation hole. The fiber grating signal line 6 is arranged on the outer surface of the constant temperature box, and the fiber grating signal input line 6 is connected with a fiber grating tem- perature sensor 27 arranged on the outer wall of the constant tem- perature box. The thermostat cover 15 is connected to the thermo- stat by means of a buckle 16 and a hinge 17. The execution core of the control system 12 is a PLC controller.
Working principle: firstly, the device reduces the heat ex- change between the internal environment and the external environ- ment of the equipment room of the incubator through the polyure- thane PU plastic shell and the thermal insulation layer, thus re- ducing the influence of the external high and low the temperature environment on the temperature of the environment in the incuba- tor. The dry ice in the dry ice chamber evaporates to form a cold source, and the air in the dry ice chamber is cold air with lower temperature; The demodulator in the equipment chamber generates heat when working, and the influence brought by the low tempera- ture environment is offset by combining with the constant tempera- ture heat insulation layer, so that only the high temperature en- vironment needs to be controlled; The temperature in the thermo- stat is measured by the resistance temperature sensor, and when the temperature in the thermostat exceeds a specified range value, the control system 12 controls the rotating speed of the fan ac- cording to the temperature signal of the demodulator and the tem- perature sensor signals of the dry ice chamber and the equipment chamber, and controls the flow rate of cold air flowing from the dry ice chamber to the equipment chamber, so as to maintain the temperature of the equipment chamber within the working tempera- ture range of the demodulator. When the external ambient tempera- ture is low, the heating of the integrated thermostatic insulation layer and the internal demodulator equipment during operation can offset the influence of the external low temperature.
When the demodulator is installed, the lug piece at the bot- tom can be pressed under the action of gravity, the lug piece ro- tates, and the side lug piece and the bottom lug piece can clamp the demodulator, so that the horizontal movement of the demodula- tor is limited under the action of the four fixed clamps; When the thermostat cover is closed, the demodulator can press the fixing clamp on the box cover, the horizontal movement of the demodulator is limited under the action of the side lug and the bottom lug of the fixing clamp, and the horizontal and vertical movement of the demodulator is limited under the combined action of eight fixing clamps on the box floor and the box cover; Because the fixing clamp on the box cover adopts a rota-table mode, the situation of
Jamming when the thermostatic box cover is closed is avoided.
Working process: First install the demodulator in the equip- ment room, and connect the power line, network cable and fiber grating signal line of the demodulator. The optical fiber grating temperature sensor and that signal line are arranged on the outer surface of the constant temperature box; The door of the constant temperature box is closed, and the buckle is locked; In a high and low temperature environment, the polyurethane heat insulation lay firstly weakens the influence of the external high and low temper- ature environment on the internal environment of an equipment room of the constant energy box; The resistance-type temperature sensor can always detect the temperature in the thermostat, the demodula- tion instrument can always output an external ambient temperature signal of the thermostat and transmit the signal to the control system 12, the signal is continuously compared with a threshold value through the control system 12, when the temperature in the thermostat is higher than the set threshold value, the control system 13 controls the rotation of the fan to convey the cold air in the dry ice chamber into the equipment chamber, the temperature in the equipment room decreases until it reaches the specified value.
The temperature control process of the device is shown in
Figure 6, input the target temperature to be maintained by the semiconductor incubator, the temperature sensors inside and out- side the incubator detect the ambient temperature and input it to the control system, the control system judges whether the ambient temperature alarms. When the temperature in the equipment room of the thermostat is lower than the set temperature, the fan does not work, and the equipment room relies on the heat generated by the demodulator to balance the internal temperature; When the tempera- ture in the equipment room of the thermostat is higher than the set temperature, the cooling fan starts to work to ensure that the temperature of the room is at the target temperature.
The input-output control relationship of the temperature con- trol system (12) is as follows: y(t) = u(t) x g u(t) = aPID gp + BPIDy) £ de(t)
PIDe) = Kpelt) + K; | e(T)dT + K4 ar t
PIDs = Kp f(t) + K; [ f(T)dT + K, JO e(t) =S-—A fi) =S — BE ln By(N=12,..20), (y(N=1,2,..20)
Ky = 0.65K, ; K; = Kp»; Ka = Kp * 2
Pp ce: hi Pr; d [I e: Temperature error inside the equipment room of the incuba- tor; f: External temperature error of the incubator; g:Refrigeration efficiency;
S: Temperature set value;
A: Temperature of the sensor temperature of the equipment room inside the incubator;
By: Temperature of the sensor temperature in the Thermostat surface;
L¥: Heat transfer coefficient at the position of each grating of the surface temperature sensor of the incubator; p, Dry ice chamber temperature:
T: PID control sampling calculation period
Ti: Integration time of the control system
Ta: Differential time of the control system
Specifically, the temperature control method of the modem dry ice type temperature control system for the ground test of the ro- tor system comprises the following steps: 1) Detecting the temperature data of each area according to a predetermined period, wherein the area comprises an outer area of a thermotank corresponding to each grating in each fiber grating temperature sensor string, an equipment room corresponding to a first temperature sensor, and a dry ice room corresponding to a second temperature sensor; Wherein the first temperature sensor (13) corresponds to a temperature value Aof an equipment room (11) inside the incubator, wherein the temperature valueAis a tempera- ture collected at each time node; The second temperature sensor (26) corresponds to a temperature value D of the dry ice chamber (3) inside the incubator, wherein the temperature value Dis a tem- perature collected at each time node; The optical fiber grating temperature sensor (27) are corresponding to that external surface temperature of the constant temperature box; The control system (12) collects the temperature values detect by each temperature sensor according to a predetermined period, wherein the infor- mation collected by the optical fiber grating temperature sensors is analyzed and processed by the optical fiber grating demodula- tion instrument (14) to obtain a plurality of temperature val- uesBy iN = 1, 2... , 20), N is the number of gratings in the fiber grating temperature sensor (27); 2) When that signal of the resistance type temperature sensor is received at each moment, the control system (12) judges the temperature value A inside the equipment chamber of the constant temperature box, when A is more than 60 deg C or less than -20 deg
C, an alarm is sent out, and an alarm indicator lamp is on; 3) The method to Obtain that heat transfer coefficients of the outer wall of the correspond thermotank in each grating tem- perature sensor (27) to the internal environment of the equipment comprises the following steps: heating or refrigerating a position where a grating temperature sensor is arranged on the outer sur- face of the thermotank when the temperatures inside and outside the thermotank are the same, measuring the surface temperature of the same part of the inner and outer walls of the thermotank, and taking an absolute value obtained by subtracting the inner and outer temperatures, wherein the absolute value is the heat trans- fer coefficient; 4) Setting a target temperature value Swhich needs to be kept in the constant temperature box, wherein the temperature S is more than20 deg C below zero and less than 60 deg C;
5) Determining the cooling efficiencygof the cooling fan; The refrigerating efficiency is determined according to the change of the temperature value Din the dry ice chamber and is the ratiog= tiog=|8Dlot the temperature difference between the dry ice cham- ber and the equipment chamber at the current moment to the start- ing moment, and the initial temperature of the dry ice room is -20 deg C, D is more than -20 and less than A, and g is more than and less than 1; 6) Determining a first difference value function lel = 5 —4 of the temperature in the equipment chamber of the constant tempera- ture box and the target temperature, wherein the first difference value function is a functionf(t) = § — Noe the difference value between the temperature value A in the equipment chamber of the constant temperature box and the target temperature value 5 chang- ing with time; The method for calculating the second difference function comprises the following steps: firstly obtaining an aver- age value of the temperature valueBy of each grating temperature sensor multiplied by the corresponding heat transfer coefficient
Cn, wherein the function of the difference between the average value and the target temperature with respect to time is the sec- ond difference function, and N is the number of outer wall temper- ature sensors; 7) Determining the first output function by the first differ- ence function, and obtaining the first output function by the ac- cumulation of proportional integral calculation, integral calcula-
PID, = Kei) + EK, [otras + Ky ze tion and differential calculation; or = gr where, Ky e(Dis the proportional integral calculation, that is, the function e(t) of the temperature difference between the inside and outside of the incubator at time t is multiplied by a proportional gainKp, Kp, = 0.65K, K¢is the minimum value as far as the steady-state error of the control system (12) reaches PIDe) = Kcelt) under the condition that only proportional link control is adopted; the speed of the thermostat reaching the target temperature can be controlled by adjusting the value of Kp, and the higher of the value of Kp is, the higher the speed of approaching the target temperature is; In the integral calculation step K; { e(Ddt , namely, consider- ing the past error, integrate the first difference function from the beginning to the current time and multiply the first differ- ence function by an integral gain Ki Ki = Kp » - wherein t is a PID control sampling calculation period andT; an integral time of the control system (12); In the differential calculation step Kan, calculate the first derivative of the first difference function in consideration of the upcoming error, and multiply the first deriv- ative by a positive constantKy, Ka = Kp +=, wherein t is the differ- ential time of the control system (12), and the three parameters are all adaptive parameters and are greater than 0; tis the inde- pendent variable of the time change; 8) Determining a second output function from the second dif- ference function; A second output function
PID = Rf KE, { pinyin + KX, zo ’ ~ ® js obtained through the accumulation of a proportional calculation, an integral calculation and a dif- ferential calculation, wherein the proportional calculation, the integral calculation and the differential calculation are all ob- tained based on the second difference function f(t), the meaning and the method are the same as those of the first output function, and the three calculation links and parameter actions are the same as those of the first output function; 9) Determining an output function; wherein the output func- tion p(t) is obtained by adding the first function and the second function, wherein the output function u(t) isu(t) = aPIDe) + BPID, wheredandBare the fitting parameters of the first output function and the second output function respectively; wherea = 2,8 = |E. 0 <a< 1, 0 <B< 1,ais the proportional parameter corresponding to the internal ambient temperature difference of the equipment room and the maximum temperature difference of 40 °C.eis the temperature difference between the current internal ambient temperature of the equipment chamber of the incubator and the set target temperature when the system (12) samples, when the change range of the inter- nal ambient temperature of the equipment chamber is below -40 deg
C or abovea70 deg C, 1 is taken, and when the internal ambient temperature in the equipment chamber is the same as the target temperature,atakes 0; Bisa proportional parameter corresponding to the external ambient temperature difference and the maximum tem- perature difference of 55 deg C, f is the temperature difference between the current external ambient temperature and the set tar- get temperature when the control system (12) is used for sampling, when the variation range of the external ambient temperature is below minus 20 deg C and above 60 deg C, Bis taken as 1, when the external ambient temperature is the same as the target tempera- ture, Bis taken as 0.
The total output function isy(t) = ult) *g,y 20, which is ob- tained by multiplying the output function p(t) by the refrigeration efficiencyg, the purpose is to compensate for the weakening of the refrigeration effect of dry ice by increasing the fan output in the process of temperature change in the dry ice chamber; 10) The control system drives the cooling fan to rotate ac- cording to the total outputy(t); By adjusting the fan voltage, the fan speed is adjusted to deliver the cold air in the dry ice room to the equipment room, so as to reduce the ambient temperature in the equipment room.
The temperature control algorithm of the device is based on the PID algorithm, and the parameters of two temperature sensors inside and outside the thermostat are respectively calculated by
PID and then superposed; When the temperature of the equipment room is lower than the target temperature, the cold air fan stops working; A temperature control algorithm of the device is based on a PID algorithm, after a target temperature is set, an internal temperature sensor detects an internal temperature, a detection result Ais input into the control system 12 to calculate to obtain a difference function between the current internal ambient temper- ature and the target temperaturee(t), ande(t),the difference function is substituted into the PID algorithm, after the proportional al- gorithm, the integral algorithm and the differential algorithm are superimposed, the output function required internally is obtained as followsPIDgwy; And that Bycontrol system 12 add an influence factor Cy according to the influence of the temperature of each temperature sensor on the inside of the thermotank and calculate the temperature difference between the external environment and the internal environment to obtain a temperature difference func- tionf(t), the output function obtained by f(t) substituting into the
PID algorithm is PIDgy, and the total output of the heating and cooling system obtained by combining the influence of the internal heat source and the external heat source/cold source on the inter- nal temperature environment is u(t). Kp, Ki, Ka, a. B are suitable ad- jJustment parameters, which shall be determined through repeated tests. And obtain a current dry ice chamber temperature difference function through that dry ice chamber temperature sensor, wherein the rotating speedy(t) of the fan is a function of the temperature difference between the total output and the dry ice chamber. The fan rotates and cold air is input into the equipment room to re- duce the temperature of the equipment room. The control relation- ship principle block diagram of the temperature control system of the present invention is shown in fig. 7.
However, the examples of the present invention are not lim- ited thereto, and any changes that can be considered by those skilled in the art should fall within the scope of the present in- vention.

Claims (4)

CONCLUSIESCONCLUSIONS 1. Temperatuurcontrolesysteem van het type droog ijs van een modem voor grondtests van een rotorsysteem, dat wordt gekenmerkt door het bestaan van een met droog ijs draagbare incubator, een vezel- roosterdemodulator {14} en een controlesysteem (12), waarin de in- cubator een droogijskamer (3) en een apparatuurkamer (11) omvat; tussen de droogijskamer (3) en de machinekamer (11) wordt een scheidingsplaat gebruikt om de luchtstroom van de twee ruimten te isoleren, en op de scheidingsplaat wordt een ventilator voor koude lucht (4) geplaatst; een eerste temperatuursensor (13) is opge- steld in de apparatenkamer (11); een tweede temperatuursensor (26) is opgesteld in de droogijskamer (3); een optische vezeldemodula- tor (14) is opgesteld in de apparatenkamer (11); een regelsysteem (12) is opgesteld in een isolerende laag (2) die op de zijwand van de uitrustingsruimte (11) is aangebracht; het vezelroosterdemodu- latie-instrument (14) is verbonden met een vezelroostersignaalin- voerlijn (6); en de fiber grating signaal ingangslijn (6) is ver- bonden met een fiber grating temperatuursensor (27) opgesteld op de buitenwand van de constante temperatuur box.A dry ice modem type temperature control system for soil testing of a rotor system, characterized by the existence of a dry ice portable incubator, a fiber lattice demodulator {14} and a control system (12), in which the incubator comprises a dry ice chamber (3) and an equipment chamber (11); between the dry ice chamber (3) and the machine room (11), a partition plate is used to isolate the airflow of the two rooms, and a cold air fan (4) is placed on the partition plate; a first temperature sensor (13) is arranged in the equipment room (11); a second temperature sensor (26) is arranged in the dry ice chamber (3); an optical fiber demodulator (14) is arranged in the equipment room (11); a control system (12) is arranged in an insulating layer (2) applied to the side wall of the equipment room (11); the fiber grating demodulation tool (14) is connected to a fiber grating signal input line (6); and the fiber grating signal input line (6) is connected to a fiber grating temperature sensor (27) arranged on the outer wall of the constant temperature box. 2. Het temperatuurregelsysteem met droogijs van een modem voor grondtests van een rotorsysteem volgens conclusie 1, waarin de droogijskamer (3) en de apparatuurkamer (11) zich bevinden in de PU-kunststofschaal (1), de isolatielaag (2) zich bevindt tussen de zijwand van de apparatuurkamer (11) en de PU-kunststofschaal (1), en de isolatielaag (2) een polyurethaan-isolatielaag is.The dry ice temperature control system of a soil test modem of a rotor system according to claim 1, wherein the dry ice chamber (3) and the equipment chamber (11) are located in the PU plastic shell (1), the insulation layer (2) is located between the side wall of the equipment room (11) and the PU plastic shell (1), and the insulation layer (2) is a polyurethane insulation layer. 3. Het droogijstemperatuurregelsysteem van modem voor grondtest van rotorsysteem volgens conclusie 1, waarin de vezelroosterdemo- dulator (14) via een bevestigingsklem (19) in de technische ruimte (11) is geplaatst.The dry ice temperature control system of soil test rotor system modem according to claim 1, wherein the fiber grating demodulator (14) is located in the equipment room (11) via a mounting clip (19). 4. Temperatuurregelmethode voor het droogijstemperatuurregelsys- teem van de modem voor de grondtest van het rotorsysteem volgens conclusie 1, waarin de methode de volgende stappen omvat:A temperature control method for the dry ice temperature control system of the soil test modem of the rotor system according to claim 1, wherein the method comprises the steps of: 1) temperatuurgegevens van elk gebied detecteren volgens een voor- af bepaalde periode, waarbij het gebied bestaat uit een buitenge- bied van een thermotank die overeenkomt met elk rooster in elke vezelroostertemperatuursensorreeks, een uitrustingsruimte die overeenkomt met een eerste temperatuursensor, en een droogijsruim- te die overeenkomt met een tweede temperatuursensor; Waarbij de eerste temperatuursensor (13) overeenkomt met een temperatuurwaar- de A van een technisch lokaal (11) in de incubator, waarbij de temperatuurwaarde A een temperatuur is die op elk tijdsknooppunt wordt verzameld; De tweede temperatuursensor (26) komt overeen met een temperatuurwaarde D van de droogijskamer (3) in de incubator, waarbij de temperatuurwaarde D een temperatuur is die op elk tijdsknooppunt wordt verzameld; de optische vezelroostertempera- tuursensor (27) komt overeen met die externe oppervlaktetempera-1) detect temperature data of each area according to a predetermined time period, the area consisting of an outer area of a thermotank corresponding to each grid in each fiber grid temperature sensor array, an equipment room corresponding to a first temperature sensor, and a dry ice room corresponding to a second temperature sensor; wherein the first temperature sensor (13) corresponds to a temperature value A of a technical room (11) in the incubator, the temperature value A being a temperature collected at each time node; The second temperature sensor (26) corresponds to a temperature value D of the dry ice chamber (3) in the incubator, the temperature value D being a temperature collected at each time node; the optical fiber grating temperature sensor (27) corresponds to that external surface temperature tuur van de constante temperatuurdoos; Het regelsysteem (12) ver- zamelt de door elke temperatuursensor gedetecteerde temperatuur- waarden volgens een vooraf bepaalde periode, waarbij de door de optische vezelroostertemperatuursensoren verzamelde informatie wordt geanalyseerd en verwerkt door het optische vezelroosterdemo-ture of the constant temperature box; The control system (12) collects the temperature values detected by each temperature sensor according to a predetermined period, the information collected by the optical fiber grating temperature sensors being analyzed and processed by the optical fiber grating demo. dulatie-instrument (14) om een veelheid van temperatuurwaarden By(N = 1, 2... , 20) te verkrijgen, waarbij N het aantal roosters in de vezelroostertemperatuursensor (27) is;dulation tool (14) to obtain a plurality of temperature values By(N = 1, 2..., 20), where N is the number of gratings in the fiber grating temperature sensor (27); 2) wanneer dat signaal van de weerstandstemperatuursensor op elk moment wordt ontvangen, beoordeelt het regelsysteem (12) de tempe-2) when that signal is received from the resistance temperature sensor at any time, the control system (12) judges the temperature ratuurwaarde A binnen de apparatuur van de constante temperatuur- kast, wanneer A meer dan 60 deg C of A minder dan -20 deg C is, wordt een alarm uitgezonden en gaat een alarmindicatorlampje bran- den;ture value A within the equipment of the constant temperature cabinet, when A is more than 60 deg C or A is less than -20 deg C, an alarm will be emitted and an alarm indicator light will light up; 3) methode voor het verkrijgen van die warmteoverdrachtscoéfficiént3) method for obtaining said heat transfer coefficient Ys van de buitenwand van de corresponderende thermotank in elke roostertemperatuursensor (27) naar de interne omgeving van de ap- paratuur omvat de volgende stappen:het verwarmen of koelen van een positie waar een roostertemperatuursensor op het buitenoppervlak van de thermotank is aangebracht wanneer de temperaturen binnen en buiten de thermotank gelijk zijn, het meten van de oppervlaktetem- peratuur van hetzelfde deel van de binnen- en buitenwand van de thermotank en het aftrekken van de absolute waarde van de binnen- en buitentemperatuur, waarbij de absolute waarde de warmteover- drachtscoëfficiënt is; 4) Instellen van een doeltemperatuurwaarde S die in de constante temperatuurbox moet worden gehouden, waarbij de temperatuurwaarde S meer dan 20 deg C onder nul en minder dan 60 deg C bedraagt; 5) Bepaling van het koelrendement g van de koelventilator; Het koelrendement wordt bepaald aan de hand van de verandering van de temperatuurwaarde D in de droogijskamer en is de verhouding g= |] van het temperatuurverschil tussen de droogijskamer en de machinekamer op het huidige moment en het beginmoment, en de be- gintemperatuur van de droogijsruimte is min 20 deg C, min 20 is meer dan D en minder dan A, en g is meer dan 0 en minder dan 1; 6) Bepaling van een eerste verschilfunctie sltl=%-4 tussen de tem- peratuur in de kamer van het thermostaatapparaat en de doeltem- peratuur, waarbij de eerste verschilfunctie het verschil is tussen de temperatuurwaarde A in de kamer van het thermostaatapparaat en de doeltemperatuurwaarde S als functie van de tijd;Bepaling van de tweede verschilfunctie f(t) = 5 — ZC tussen de temperatuur van de buitenwand van de thermostaat en de doeltemperatuur;waarbij de tweede verschilfunctie wordt berekend door eerst de gemiddelde waarde van de temperatuurwaarde By van elke roostertemperatuursen- sor te verkrijgen, vermenigvuldigd met de overeenkomstige warmte- overdrachtscoëfficiënt Cy, het verschil tussen deze gemiddelde waarde en de doeltemperatuur als functie van de tijd, en N het aantal roosters van de buitenwandtemperatuursensor is. 7) Bepaling van de eerste uitgangsfunctie uit de eerste verschil- functie; de eerste uitgangsfunctie wordt verkregen door de accumu- latie van de proportionele integrale berekening, de integrale be- rekening en de differentiële berekening: PIR, > Kel) + K, | et id + Ky seit) ot © Jg St , waarin Kpe(t) een proportionele in- tegraalberekening is, d.w.z. de temperatuurverschilfunctie e(t) bin- nen en buiten de thermostaat op tijdstip t vermenigvuldigd met een proportionele versterking K,,K,=0.65K. , K« is de K,-waarde in deYs from the outer wall of the corresponding thermotank in each grid temperature sensor (27) to the internal environment of the equipment includes the following steps: heating or cooling a position where a grid temperature sensor is mounted on the outer surface of the thermotank when the temperatures inside and outside the thermotank are equal, measuring the surface temperature of the same part of the inner and outer walls of the thermotank and subtracting the absolute value from the inner and outer temperature, the absolute value being the heat transfer coefficient; 4) Setting a target temperature value S to be kept in the constant temperature box, where the temperature value S is more than 20 deg C below zero and less than 60 deg C; 5) Determination of the cooling efficiency g of the cooling fan; The cooling efficiency is determined from the change of the temperature value D in the dry ice chamber and is the ratio g= |] of the temperature difference between the dry ice chamber and the machine room at the current time and the initial time, and the initial temperature of the dry ice room is minus 20 deg C, minus 20 is more than D and less than A, and g is more than 0 and less than 1; 6) Determination of a first difference function sltl=%-4 between the temperature in the room of the thermostat device and the target temperature, where the first difference function is the difference between the temperature value A in the room of the thermostat device and the target temperature value S as a function of time; Determination of the second difference function f(t) = 5 — ZC between the temperature of the outer wall of the thermostat and the target temperature; where the second difference function is calculated by first calculating the average value of the temperature value By of each grid temperature - to obtain sor multiplied by the corresponding heat transfer coefficient Cy, the difference between this average value and the target temperature as a function of time, and N is the number of grilles of the outside wall temperature sensor. 7) Determination of the first output function from the first difference function; the first output function is obtained by the accumulation of the proportional integral calculation, the integral calculation and the differential calculation: PIR, > Kel) + K, | et id + Ky seit) ot © Jg St , where Kpe(t) is a proportional integral calculation, i.e. the temperature difference function e(t) inside and outside the thermostat at time t multiplied by a proportional gain K,,K, =0.65K. , K« is the K, value in the PID. = Kcelt) van het regelsysteem (12) uitsluitend onder proportio- neel-koppelingsvoorwaarden, waarbij de fout in de stationaire toe- stand zo klein mogelijk is; De snelheid waarmee de thermostaat de doeltemperatuur bereikt, kan worden geregeld door de Kp aan te passen; hoe groter de Kp; hoe sneller de doeltemperatuur wordt be- naderd; De Ki J, e(Ddt integratieberekening, d.w.z. de eerste ver- schilfunctie wordt geïntegreerd van het begin tot het huidige mo- ment en vermenigvuldigd met de integratiewinst K;, rekening houdend met fouten uit het verleden; Ki=Kp*g it is de berekeningsperiode van de PID-regelingsbemonstering en T; is de integratietijd van het regelsysteem (12) Ka differentiële berekeningsverbinding,PID. = Kcelt) of the control system (12) under proportional-coupling conditions only, where the steady-state error is as small as possible; The speed at which the thermostat reaches the target temperature can be controlled by adjusting the Kp; the greater the Kp; the faster the target temperature is approached; The Ki J, e(Ddt integration calculation, i.e. the first difference function is integrated from the beginning to the present moment and multiplied by the integration gain K;, taking past errors into account; Ki=Kp*g it is the calculation period of the PID control sampling and T; is the integration time of the control system (12) Ka differential calculation connection, d.w.z. rekening houdend met de dreigende fout, voor het berekenen van de eerste-orde-afgeleide van de eerste verschilfunctie en deze te vermenigvuldigen met een positieve constante Kg, Ke=K,*2,,t is de differentiële tijd van het regelsysteem (12); alle drie de parameters zijn aanpassingsparameters en zijn groter dan 0; t is de in de tijd variërende onafhankelijke variabele. 8) tweede uitgangsfunctie wordt bepaald door de tweede verschil- PID = RF HK [ rme 228 functie; de tweede ultgangsfunctie A BL wordt verkregen door de accumulatie van proportionele, integrale en differentiële berekeningen, waarbij de proportionele, integrale en differentiële berekeningen worden verkregen op basis van de tweede verschilfunctie f(t), met dezelfde betekenis en methode als de eerste uitgangsfunctie, en de drie berekeningsschakels en - parameters op dezelfde manier werken als de eerste uitgangsfunc- tie; 9) de uitgangsfunctie bepalen; de uitgangsfunctie u{t) wordt verkre- gen door de eerste functie en de tweede functie op te tellen; waarbij de uitgangsfunctie p(t) = aPIDy + PIDs is, waarbij o en 8 de fitnessparameters van respectievelijk de eerste en de tweede uitgangsfunctie zijn; waarvan a=|E|8=|El O<a<1,0<B<1, « is de schaalparameter die overeenkomt met het verschil in omgevingstem- peratuur binnen de ruimte van de apparatuur en het maximale tempe-i.e. taking into account the impending error, to calculate the first order derivative of the first difference function and multiply it by a positive constant Kg, Ke=K,*2,,t is the differential time of the control system (12 ); all three parameters are adjustment parameters and are greater than 0; t is the time-varying independent variable. 8) second output function is determined by the second difference PID = RF HK [ rme 228 function; the second output function A BL is obtained by the accumulation of proportional, integral and differential calculations, where the proportional, integral and differential calculations are obtained on the basis of the second difference function f(t), having the same meaning and method as the first output function, and the three calculation links and parameters operate in the same way as the first output function; 9) determine the output function; the output function u{t) is obtained by adding the first function and the second function; where the output function is p(t) = aPIDy + PIDs, where o and δ are the fitness parameters of the first and second output functions, respectively; where a=|E|8=|El O<a<1.0<B<1, « is the scaling parameter corresponding to the difference in ambient temperature within the equipment room and the maximum temperature ratuurverschil van 40°C, e is het temperatuurverschil tussen de huidige omgevingstemperatuur in de ruimte van de thermostaat en de ingestelde doeltemperatuur op het moment dat het regelsysteem (12) wordt bemonsterd, wordt genomen als 1 wanneer de omgevingstem- peratuur in de technische ruimte varieert tussen -40°C en 70°C, « wordt genomen als 0 wanneer de interne omgevingstemperatuur van de ruimte voor apparatuur dezelfde is als de doeltemperatuur; B is de proportionele parameter die overeenkomt met het verschil tussen de externe omgevingstemperatuur en het maximale temperatuurverschil van 55°C. f is het temperatuurverschil tussen de huidige externe omgevingstemperatuur en de ingestelde doeltemperatuur wanneer het regelsysteem (12) wordt bemonsterd, B neemt 1 wanneer de externe omgevingstemperatuur verandert in het bereik onder -20°C en boven 60°C, en neemt 0 wanneer de externe omgevingstemperatuur gelijk is aan de doeltemperatuur; de totale outputfunctie is y(t) = u(t) xg, y 20, verkregen door de out- putfunctie H(£) te vermenigvuldigen met de koelefficiéntie g.temperature difference of 40°C, e is the temperature difference between the current ambient temperature in the room of the thermostat and the set target temperature at the time the control system (12) is sampled, is taken as 1 when the ambient temperature in the technical room varies between -40°C and 70°C, « is taken as 0 when the internal ambient temperature of the equipment room is the same as the target temperature; B is the proportional parameter corresponding to the difference between the external ambient temperature and the maximum temperature difference of 55°C. f is the temperature difference between the current external ambient temperature and the set target temperature when the control system (12) is sampled, B takes 1 when the external ambient temperature changes in the range below -20°C and above 60°C, and takes 0 when the external ambient temperature is equal to the target temperature; the total output function is y(t) = u(t) xg, y 20 obtained by multiplying the output function H(£) by the cooling efficiency g. Het doel is het effect van verminderde koeling door droogijs te com- penseren door de ventilatoroutput te verhogen bij veranderingen in de temperatuur van de droogijskamer. 10) het regelsysteem stuurt de rotatie van de koelventilator aan volgens het totale vermogen y(t); door de ventilatorspanning en dus de ventilatorsnelheid aan te passen, wordt de koude lucht uit de droogijskamer in de technische ruimte gebracht om de omgevingstem- peratuur in de technische ruimte te verlagen.The aim is to compensate for the effect of reduced dry ice cooling by increasing the fan output with changes in the temperature of the dry ice chamber. 10) the control system controls the rotation of the cooling fan according to the total power y(t); by adjusting the fan voltage and thus the fan speed, the cold air from the dry ice chamber is brought into the technical room to lower the ambient temperature in the technical room.
NL2034174A 2022-12-12 2023-02-16 Dry ice type temperature control system and method of modem for ground test of rotor system NL2034174B1 (en)

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