CN115915735B - Conformal phased array radar heat dissipation method - Google Patents
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Abstract
The invention discloses a heat dissipation method of a conformal phased array radar, which relates to the technical field of heat dissipation of the conformal phased array radar and comprises the steps of judging the working state of each T/R component on the conformal phased array radar; radiating heat of the T/R component in the working state; calculating the actual heat dissipation capacity of the T/R assembly; based on the actual heat dissipation capacity and the flow margin, the invention can perform accurate air-cooled heat dissipation on the T/R components in the working state according to the working state of each TR component, compared with the existing mode of performing heat dissipation on the whole T/R component, the invention can avoid the uniform spreading of wind power generated by a fan, has larger and more concentrated flow and density of air blown to the required heat dissipation T/R component, is beneficial to enhancing the heat dissipation effect, reduces the waste of fan power while guaranteeing the heat dissipation effect, reduces the energy consumption of the fan and prolongs the standby time of the mobile conformal phased array radar, and is beneficial to environmental protection.
Description
Technical Field
The invention relates to the technical field of conformal phased array radar heat dissipation, in particular to a conformal phased array radar heat dissipation method.
Background
The TR component of the array surface of the conformal phased array radar is a main heating element, the heat flux density of the T/R component is high, and meanwhile, the requirement on the environment is high, so that the single component has high requirement on the working temperature, and the temperature balance of each array element after the array surface is formed is required to be good; the common antenna for transmitting and receiving of the common phased array radar is provided with two working states of receiving and transmitting, the T/R assembly can realize switching of transmitting and receiving signals, power amplification and time-sharing working of the two states, and the heating of the T/R assembly mainly consists in the output power of a transmitting signal of a transmitter, and the required power is smaller when the signal is received.
At present, the Chinese patent of application publication number CN 106777715A discloses a self-adaptive growth method and a self-adaptive growth system of a heat dissipation network of a T/R assembly of a phased array radar, wherein the method is used for carrying out layout optimization design of a heat dissipation runner network by simulating growth of plant root systems in soil, which is subject to nutrient concentration. Compared with the traditional heat dissipation method of the conformal phased array radar, the heat dissipation method of the conformal phased array radar also adopts a centralized heat dissipation mode to conduct heat dissipation on the whole T/R assembly, and because wind power generated by a fan is evenly spread, air flow and density of the air blown to the T/R assembly needing heat dissipation are smaller, heat dissipation effect is poor, the fan needs to be opened to higher power to meet heat dissipation requirements, the energy consumption of the fan is too high, the standby time of the mobile conformal phased array radar is affected, and environmental protection is not facilitated.
Disclosure of Invention
The invention solves the technical problems that: the problem that the heat dissipation effect of the concentrated heat dissipation mode is poor, the energy consumption of a fan is high, and the standby time of the maneuvering type conformal phased array radar is further affected.
In order to solve the technical problems, the invention provides the following technical scheme: the heat dissipation method of the conformal phased array radar comprises the steps of judging the working state of each T/R component on the conformal phased array radar; radiating heat of the T/R component in the working state; calculating the actual heat dissipation capacity of the T/R assembly; and adjusting the fan power based on the actual heat dissipation capacity and the flow margin.
As a preferable scheme of the conformal phased array radar heat dissipation method of the invention, wherein: judging the working state of each T/R component on the conformal phased array radar comprises the following steps: and numbering the T/R components, controlling each T/R component to transmit radar signals by a control unit, marking the T/R component transmitting radar signals as an active state, and marking the T/R component not transmitting radar signals as an inactive state by the control unit.
As a preferable scheme of the conformal phased array radar heat dissipation method of the invention, wherein: heat dissipation of the T/R assembly in an operating state includes: the control unit sends a first instruction to the corresponding switch unit according to the number of the T/R component in the active state; the switch unit receives a first instruction and opens an electric control valve on a corresponding heat dissipation pipeline; air is blown from within the heat sink duct to the active T/R assembly.
As a preferable scheme of the conformal phased array radar heat dissipation method, the method for acquiring the actual heat dissipation capacity of the T/R component comprises the following steps:
acquiring the heating value Φ=of the T/R componentφ v ·v；
Acquisition of heat flux density of T/R componentφ=Φ/A 1 ；
Obtaining radiant heat dissipation pf=a of T/R assembly 1 ·φ/2C 0 ；
Acquiring actual heat dissipation quantity delta s=phi-Pf of the T/R assembly;
wherein ,φ v power density for T/R assembly;vrepresenting the volume size of the T/R assembly, A 1 Represents the surface area of the T/R assembly, C 0 Indicating the blackbody radiation constant.
As a preferable scheme of the conformal phased array radar heat dissipation method, the specific method for adjusting the fan power based on the actual heat dissipation capacity and the flow margin comprises the following steps:
according to Φ1=q v ·ρ·Cp·ΔtAcquiring the flow q of air v ；
Setting a flow margin delta k;
obtaining the air flow w=deltak+q in the heat dissipation pipeline v ；
Acquiring the wind speed V=w/f of the blowing of the fan;
acquiring the power vkw =w·pa/ef·ej of the fan;
wherein Φ1 represents the heat absorbed by air, Φ1=Δs, cp represents the specific heat capacity of air, ΔtThe temperature rise of air is represented, ρ represents the density of air, f represents the cross-sectional area of a heat dissipation pipe, pa represents the wind pressure, ej represents the mechanical transmission efficiency, and ef represents the fan efficiency.
The invention also provides a conformal phased array radar heat dissipation system, which comprises a control unit, wherein the control unit is used for controlling the working state of the T/R component and is connected with the switch unit; the heat dissipation unit comprises a heat dissipation pipeline, an electric control valve and a case, wherein one end of the heat dissipation pipeline is connected with the case, a heat dissipation screen plate is arranged on the case, the end head of the heat dissipation pipeline faces towards the T/R assembly, the T/R assembly is arranged on the case, and the electric control valve is arranged on the heat dissipation pipeline and connected with the switch unit.
As a preferred embodiment of the conformal phased array radar heat dissipation system of the present invention, wherein: the control unit is connected with the temperature sensing module, the temperature sensing module is used for collecting the internal temperature of the case and inputting the collected temperature information into the control unit, a temperature threshold value is preset in the control unit, and when the temperature information is larger than the temperature threshold value, the control unit controls the fan to increase the output power.
The invention has the beneficial effects that: according to the invention, the T/R assembly in the working state can be subjected to accurate air cooling heat dissipation according to the working state of each TR assembly, compared with the existing mode of carrying out heat dissipation on the whole T/R assembly, the invention can avoid the uniform spreading of wind power generated by a fan, has larger and more concentrated flow and density of air blown to the T/R assembly requiring heat dissipation, is beneficial to enhancing the heat dissipation effect, reduces the waste of fan power while guaranteeing the heat dissipation effect, reduces the energy consumption of the fan and prolongs the standby time of the maneuvering conformal phased array radar, and is beneficial to environmental protection.
Drawings
Fig. 1 is a schematic diagram of a basic flow of a heat dissipation method of a conformal phased array radar according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a conformal phased array radar structure of a method for dissipating heat of a conformal phased array radar according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a cylindrical array structure in a heat dissipation method of a conformal phased array radar according to an embodiment of the present invention.
Fig. 4 is a schematic flow control diagram of a heat dissipation method of a conformal phased array radar according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a heat dissipation unit structure and a T/R assembly of a heat dissipation method for a conformal phased array radar according to an embodiment of the invention.
Fig. 6 is a schematic diagram of a heat dissipating unit of a heat dissipating method of a conformal phased array radar according to an embodiment of the present invention.
Description of the embodiments
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.
Example 1
Referring to fig. 1 to 6, for one embodiment of the present invention, there is provided a conformal phased array radar heat dissipation method, including:
s1, judging the working state of each T/R assembly 4 on the conformal phased array radar.
Referring to fig. 3, the conformal phased array radar is preferably composed of 64 TR assemblies 4, including a cylindrical array and a tile-shaped array, and because of the "shielding effect" existing on the array surface of the conformal phased array radar, as the beam is directed differently, the transmitting signals and the incident signals at certain angles can generate a "dark area", for example, the beam is located on one side of the conformal phased array radar, the subarray on the other side cannot receive information, and the 64T/R assemblies 4 on the array surface of the conformal phased array radar do not work at the same time most of the time, so that in actual work, one TR assembly 4 or several TR assemblies 4 often work, and high temperature is generated.
The T/R module 4 preferably adopts a time-sharing operation mode, the transmission and the reception of which operate according to a certain pulse operation mode, the operation states of the T/R module 4 include a transmission state and a reception state, and the T/R module 4 is used for transmitting and receiving signals and amplifying, phase-shifting and attenuating microwave signals according to external control signals. In the transmitting state: the transmitting signal is input from the collecting port, is divided into 4 paths of radio frequency signals through the power dividing network, and then achieves functions of numerical control phase shifting, power amplification and the like through the silicon-based TR chip and is output from the antenna port. In the receiving state: the received signal is sent into the T/R component 4 from the antenna port, and is subjected to numerical control phase shifting, numerical control attenuation and power amplification, and finally is output from the collecting port through the synthesizer.
The T/R modules 4 are numbered, and each T/R module 4 may be controlled to scan a target area, the control unit 1 controls each T/R module 4 to transmit radar signals, the control unit 1 marks the T/R module 4 transmitting radar signals as active, and the T/R module 4 not transmitting radar signals as inactive. The control unit 1 preferably adopts a control chip of the model AM26LV31EIRGYR, and a program can be written in the control chip in advance.
S2, radiating the heat of the T/R assembly 4 in the working state.
The control unit 1 sends a first instruction to the corresponding switch unit 2 according to the number of the T/R component 4 in the active state.
Referring to fig. 6, the switch unit 2 receives a first instruction, and opens the electric control valve 32 on the corresponding heat dissipation pipe 31; after the electric control valve 32 is opened, wind of the heat dissipation pipeline 31 can be blown to the T/R assembly 4, and after the electric control valve 32 is closed, the inside of the heat dissipation pipeline 31 is sealed.
Air is blown from within the heat dissipation duct 31 towards the active T/R assembly 4.
Referring to fig. 6, the end of the heat dissipation pipe 31 may be connected to a fan through a main pipe, and wind generated during operation of the fan is blown to the T/R assembly 4 through the main pipe and the heat dissipation pipe 31, that is, the T/R assembly 4 in a transmitting state, because the heat productivity of the T/R assembly 4 in the transmitting state is large, the heat dissipation is performed on the T/R assembly according to the state of the T/R assembly 4, compared with the existing heat dissipation method for the whole T/R assembly, the wind generated by the fan is prevented from being uniformly spread, the flow and the density of the air blown to the T/R assembly 4 in a required heat dissipation are more concentrated, which is beneficial to enhancing the heat dissipation effect, reducing the energy consumption of the fan, prolonging the standby time of the mobile conformal phased array radar, and being beneficial to environmental protection. The cooling air flows to the adjacent T/R assembly 4 after blowing to the T/R assembly 4, so that flowing air flow is generated, and heat is dissipated. And compare the current mode of waiting until the temperature of T/R subassembly 4 rises to certain threshold value and just carrying out the forced air cooling, can just cool down to T/R subassembly 4 at just beginning entering active state, avoided the process that T/R subassembly 4 was heated up, can slow down the whole speed that heats up of conformal phased array radar, be favorable to avoiding its high temperature, guarantee its performance, increase of service life.
And S3, calculating the actual heat dissipation capacity of the T/R assembly 4.
Calculating the heat flux density of the T/R assembly 4 includes:
the power density of the T/R component 4 is calculated by the following expression:
Φ=φ v ·v
where phi represents the heat generation amount of the T/R assembly 4,vindicating the size of the T/R assembly 4,φ v the calculation formula for the power density and the heat flux density is as follows:
φ=Φ/A 1
wherein ,φrepresenting the density of the heat flow,A 1 representing the surface area of the T/R assembly 4.
The radiation heat dissipation of the T/R assembly 4 is calculated, and the calculation expression is as follows:
Pf=A 1 ·φ/2C 0
wherein ,C0 The blackbody radiation constant is represented by Pf, and the radiation heat dissipation amount is subtracted from the heat generation amount Φ of the T/R module 4 to obtain the actually required heat dissipation amount.
Because the T/R component 4 radiates a part of heat through blackbody radiation, the actually required heat radiation amount of the T/R component 4 needs to be calculated, so that the heat radiation of the T/R component 4 is controlled more, and the power waste of wind is reduced.
The heat absorbed by the air is calculated, and the calculation expression is as follows:
Φ1=q v ·ρ·Cp·Δt
wherein Φ1 represents the heat absorbed by air, cp represents the specific heat capacity of air, Δt represents the temperature rise of air, q v The flow rate ρ of the air is represented as the density of the air, and since the heat quantity Φ1 absorbed by the air, the specific heat capacity Cp of the air, wen Sheng t of the air, and the density ρ of the air are known parameters, the flow rate qv of the air can be calculated as the air flow rate in the heat radiation pipe 31, that is, the theoretical air flow rate of the blower.
The total heat taken away by the air can be calculated by calculating the heat absorbed by the air and the flow rate of the air, and the air flow rate in the heat dissipation pipeline 31, that is, the theoretical air quantity of the fan can be calculated by the total amount of the air and the area of the cross section of the heat dissipation pipeline 31.
And S4, adjusting the fan power based on the actual heat dissipation capacity and the flow margin.
The temperature difference between the air inlet position and the air outlet position of the chassis 33 can be used as the actual heat dissipation amount Δs, the actual heat dissipation amount Δs is smaller than the heat generation amount of the T/R assembly 4 because the air flow in the heat dissipation pipeline cannot completely act on the heat dissipation of the T/R assembly 4, and a certain flow margin is reserved for the flow qv of the air.
By reserving a certain flow margin for the flow qv of air, the heat dissipation effect can be ensured, and the specific flow margin value can deviate the heat dissipation effect due to different wiring patterns in the conformal phased array radar, and the air flow required by heat dissipation and temperature reduction of the T/R component 4 to the normal temperature can be measured through actual measurement, namely, the deltaz is measured and calculated.
The flow margin is calculated by the following expression:
Δk=Δz-Δs
wherein Δk represents a flow margin, and the sum w of the flow margin Δk and the flow qv of air is taken as the air flow in the heat dissipation pipeline, namely the actual air volume of the fan;
V=w/f
wherein w represents the actual air volume of the fan, v represents the air speed, f represents the cross-sectional area of the heat dissipation pipeline, and the power calculation expression of the fan is as follows:
vkw=w·pa/ef·ej
wherein vkw denotes the power of the blower, pa denotes the wind pressure, ej denotes the mechanical transmission efficiency, pa denotes the wind pressure, ef denotes the blower efficiency, wherein the wind pressure pa can be obtained by measuring the wind pressure in the heat dissipation pipeline of the blower at a unit power, the blower efficiency ef and the mechanical transmission efficiency ej are known constants, the power vkw of the blower is calculated and obtained, and the output power of the blower is adjusted according to the actual heat dissipation amount deltas.
The power vkw of the fan required by heat dissipation of the T/R component 4 is calculated, and then the output power of the fan is adjusted according to the actual heat dissipation amount delta s, so that the heat dissipation of the T/R component 4 is controlled more accurately, the heat dissipation effect is ensured, the waste of the fan power is reduced, and the energy consumption of the fan is reduced.
Referring to fig. 2, in order to verify that the method performs a comparative experiment, specifically, calculates the power of a certain conformal phased array radar when the T/R components 4 of the array surface transmit, where the array surface of the conformal phased array radar has 64 TR components 4 and corresponds to four subarrays, one subarray includes 16 TR components 4, the array surface of the conformal phased array radar is a tile-shaped array, the TR components 4 on the left side, that is, the right side, of the conformal phased array radar are in a "dark area", the TR components 4 on the right side are in an inactive state,
the dissipation power of the TR module 4 in the active state was calculated to be 13.2W, and then the heat flux density was calculated to be 0.28W/cm 2 As can be seen from the system environment adaptability index, the highest working environment temperature of the equipment is +45 ℃, the air temperature of the air inlet is 45 ℃, the temperature rise of the air inlet and the air outlet is 10 ℃ generally, and the air temperature of the air outlet of the case 33 is 55 ℃. The available air flow qv was 0.035m3/s. At the moment, the air physical characteristic parameters are substituted into a power calculation table of the fan, the power of the fan is calculated to be 0.63kw, and then the output power of the fan is adjusted.
Comparing the power required by the fan in the traditional heat dissipation method with the power of the fan in the method, the TR assemblies 4 usually comprise 16 TR assemblies 4 according to a single subarray, and the 16 TR assemblies 4 work synchronously, and comparing the power of the fan required by heat dissipation of the single subarray with the traditional heat dissipation mode of the whole array surface.
Table 1: fan power comparison table of traditional method and present method.
| 1 |
2 |
3 subarrays | All subarrays | |
| Conventional method | 2.6kw | 2.6kw | 2.6kw | 2.6kw |
| The method | 0.32kw | 0.63kw | 1.3kw | 2.6kw |
According to the table, the method can accurately cool and dissipate heat of the T/R assembly 4 in the working state according to the working state of each TR assembly 4, compared with the existing mode of dissipating heat of the whole T/R assembly, the method can avoid the uniform spreading of wind power generated by a fan, and the flow and the density of air blown to the required heat-dissipating T/R assembly 4 are larger and more concentrated, so that the heat dissipation effect is enhanced, the waste of fan power is reduced, the energy consumption of the fan is reduced, the standby time of the mobile conformal phased array radar is prolonged, and the environment protection is facilitated.
Example 2
Referring to fig. 1 to 6, another embodiment of the present invention is different from the first embodiment in that:
the conformal phased array radar heat dissipation system comprises a control unit 1, wherein the control unit 1 is used for controlling the working state of a T/R assembly 4, and the control unit 1 is connected with a switch unit 2; the heat dissipation unit 3, the heat dissipation unit 3 includes heat dissipation pipeline 31, automatically controlled valve 32 and quick-witted case 33, the quick-witted case 33 is connected to heat dissipation pipeline 31 one end, is provided with the heat dissipation otter board 331 on the quick-witted case 33 to heat dissipation pipeline 31 end is towards T/R subassembly 4, and T/R subassembly 4 installs on quick-witted case 33, be provided with automatically controlled valve 32 on the heat dissipation pipeline 31, automatically controlled valve 32 connects switch unit 2.
In this embodiment, preferably, the end of the heat dissipation pipe 31 may be connected to the fan through a main pipe, for the T/R assembly 4 that is working, the electric control valve 32 on the corresponding heat dissipation pipe 31 is in an open state, at this time, wind generated when the fan works is blown to the T/R assembly 4 through the main pipe and the heat dissipation pipe 31, and the electric control valves 32 on the remaining heat dissipation pipes 31 are in a closed state, that is, all wind generated by the fan is blown to the T/R assembly 4 that is in a transmitting state, so that accurate air cooling and heat dissipation can be performed on the T/R assembly 4 according to the state of the T/R assembly 4, and after the wind blows to the T/R assembly 4 that is working, the wind escapes to the outside through the heat dissipation screen 331 provided on the chassis 33. The control unit 1 preferably adopts an AM26LV31EIRGYR chip, the switch unit 2 comprises a connecting wire and a flowmeter, the connecting wire is used for connecting the control unit 1 and the electric control valve 32, the flowmeter is arranged inside the heat dissipation pipeline 31 and used for checking whether air flows inside the heat dissipation pipeline 31 and confirming the opening and closing states of the electric control valve 32, so that accurate air cooling and heat dissipation are guaranteed according to the states of the T/R components 4, and air in the heat dissipation pipeline 31 is prevented from blowing to the T/R components 4 which are not in an active state, and the concentration of wind power is guaranteed.
The chassis 33 is mainly formed by screwing parts such as an upper panel, a lower panel, a left panel, a right panel, an air inlet/outlet duct board and the like, 64T/R assemblies 4 are screwed on the back side of the conformal antenna substrate, heat conducting glue is coated at a gap between two contact planes, and all parts and modules are processed by adopting AL6061 materials with high heat conducting performance. According to the requirements of the adaptability index of the electronic environment, the external environment temperature of the conformal phased array radar is between minus 30 ℃ and plus 45 ℃, the storage temperature of equipment is between minus 20 ℃ and plus 60 ℃, and the relative humidity is (95+/-3)% (+40 ℃)
The control unit 1 is connected with the temperature sensing module 5, the temperature sensing module 5 is used for collecting the internal temperature of the chassis 33 and inputting the collected temperature information into the control unit 1, a temperature threshold value is preset in the control unit 1, and when the temperature information is larger than the temperature threshold value, the control unit 1 controls the fan to increase the output power.
When the conformal phased array radar continuously works for a long time, accumulated heating of other parts also causes the temperature inside the whole chassis 33 to become high, and when the temperature information is greater than a temperature threshold value, the control unit 1 controls the fan to increase output power, so that heat dissipation is performed inside the T/R assembly 4 and the chassis 33, and the temperature is prevented from being too high.
Claims (1)
1. A conformal phased array radar heat dissipation method is characterized by comprising the following steps of
Judging the working state of each T/R component (4) on the conformal phased array radar;
radiating heat of the T/R assembly (4) in the working state;
calculating an actual heat dissipation capacity of the T/R assembly (4);
adjusting fan power based on the actual heat dissipation capacity and flow margin;
the judging of the working state of each T/R component (4) on the conformal phased array radar comprises the following steps:
numbering the T/R components (4), controlling each T/R component (4) to transmit radar signals by a control unit (1), marking the T/R component (4) transmitting radar signals as active state by the control unit (1), and marking the T/R component (4) not transmitting radar signals as inactive state;
heat dissipation of the T/R-assembly (4) in operation comprises:
the control unit (1) sends a first instruction to the corresponding switch unit (2) according to the number of the T/R component (4) in the active state;
the switch unit (2) receives a first instruction and opens an electric control valve (32) on a corresponding heat dissipation pipeline (31);
blowing air from within the heat dissipation duct (31) towards the active T/R assembly (4);
the method for acquiring the actual heat dissipation capacity of the T/R component (4) comprises the following steps:
acquiring the heating value phi = of the T/R component (4)φ v ·v；
Obtaining the heat flux density of the T/R component (4)φ=Φ/A 1 ；
Obtaining the radiant heat dissipation pf=a of the T/R assembly (4) 1 ·φ/2C 0 ；
Acquiring the actual heat dissipation quantity delta s=phi-Pf of the T/R assembly (4);
wherein ,φ v a power density for the T/R component (4);vrepresenting the volume size of the T/R assembly (4), A 1 Represents the surface area, C, of the T/R component (4) 0 Representing a blackbody radiation constant;
the specific method for adjusting the fan power based on the actual heat dissipation capacity and the flow margin comprises the following steps:
according to Φ1=q v ·ρ·Cp·ΔtAcquiring the flow q of air v ；
Setting a flow margin delta k;
obtaining the air flow w=deltak+q in the heat dissipation pipeline v ；
Acquiring the wind speed V=w/f of the blowing of the fan;
acquiring the power vkw =w·pa/ef·ej of the fan;
wherein Φ1 represents the heat absorbed by air, Φ1=Δs, cp represents the specific heat capacity of air, ΔtThe temperature rise of air is represented, ρ represents the density of air, f represents the cross-sectional area of a heat dissipation pipe, pa represents the wind pressure, ej represents the mechanical transmission efficiency, and ef represents the fan efficiency.
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| CN105208830B (en) * | 2015-09-23 | 2017-08-29 | 西安电子工程研究所 | A kind of radar TR components multitube pinpoints jet air-cooled radiating device |
| KR102131342B1 (en) * | 2018-04-13 | 2020-07-07 | 국방과학연구소 | Aesa radar cooling device and aesa radar comprising thereof |
| CN112038745B (en) * | 2020-08-17 | 2021-07-30 | 中国人民解放军空军工程大学 | Active phased array radar antenna array surface autonomous heat dissipation device based on Peltier effect |
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2023
- 2023-03-09 CN CN202310219457.0A patent/CN115915735B/en active Active
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