CN112996354A - Control method for simulated electric load heat dissipation water circulation system - Google Patents
Control method for simulated electric load heat dissipation water circulation system Download PDFInfo
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- CN112996354A CN112996354A CN202110172233.XA CN202110172233A CN112996354A CN 112996354 A CN112996354 A CN 112996354A CN 202110172233 A CN202110172233 A CN 202110172233A CN 112996354 A CN112996354 A CN 112996354A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20845—Modifications to facilitate cooling, ventilating, or heating for automotive electronic casings
- H05K7/20872—Liquid coolant without phase change
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
- H05K7/20281—Thermal management, e.g. liquid flow control
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Abstract
The invention discloses a control method of a simulated electric load heat dissipation water circulation system, which is used in the field of simulated electric loads of airplane shaping test flight subjects and the technical field of gravity center adjustment. The problem that the surface temperature of a load is too high due to the fact that a large amount of heat is generated when an existing electric load system works is solved. The electric load system is connected into the water circulation system, water in the front water tank and the rear water tank is adjusted in real time through a PID incremental control algorithm running on the FPGA, all the water tanks are all involved in adjustment, wherein the water in the front water tank group is adjusted backwards in real time, and the water in the rear water tank group is adjusted forwards in real time. All the water tanks participate in the work at the same time, so that more water participates in the heat dissipation of the analog electric load, larger heat capacity and larger heat dissipation capacity are provided, and the working time of the analog electric load is prolonged; the incremental PID adjusting algorithm based on the liquid level difference has stronger robustness, ensures the working stability of the system, realizes the control logic on the FPGA, and ensures the instantaneity, the stability and the accuracy.
Description
Technical Field
The invention relates to the field of simulated electrical loads of airplane shaping test flight subjects and the technical field of gravity center adjustment, in particular to a method for realizing heat dissipation by controlling circulating flow of water in a gravity center allocation system through a simulated electrical load system.
Background
In the process of aircraft development and test flight, the adjustment of the gravity center position of the aircraft and the detection of the performance of an aircraft generator are very important performance indexes, and the flight safety of the aircraft is directly influenced. The centre of gravity deployment system is an automatic adjustment device based on an aqueous medium, which is widely used by civil airliner companies internationally by arranging a sufficient number and volume of water tanks in the passenger cabin, connecting them by pipes, and changing the position of the centre of gravity of the aircraft by controlling the circulation flow of water. Because the electric power consumed by the airborne electric equipment in the actual test flight process of the airplane is less and the requirements of high load and full load of a single generator are difficult to meet, a set of simulated electric load system needs to be designed for enabling the output power of the generator of the airplane power supply system to reach a specific state so as to meet the requirements of part of test flight subjects. The simulation electric load is mainly used for completing the consumption of the residual power value of the generator by accessing the resistive load, the resistive load can generate a large amount of heat by long-term work to cause overhigh surface temperature of the load, in order to avoid the influence of temperature rise on the load body and the environment of the airplane passenger cabin, the simulation electric load is designed to be safely and reasonably accessed into the gravity center allocation water circulation system of the passenger cabin, and the heat dissipation of the electric load system is realized by controlling the circular flow of water.
Disclosure of Invention
The invention aims to solve the problem that the surface temperature of a load is overhigh due to the fact that a large amount of heat is generated when an existing electric load system works, and provides a simulated electric load heat dissipation water circulation control method.
The control method of the simulated electric load heat dissipation water circulation system comprises the following specific processes:
step one, setting a simulated electric load heat dissipation water circulation system, and starting the simulated electric load heat dissipation water circulation system;
secondly, simulating an electric load heat dissipation water circulation system to monitor the liquid level difference of the front water tank group and the rear water tank group in real time;
step three, judging whether the highest liquid level difference of the front and rear water tank groups is larger than a set value, if so, executing the step four, and if not, executing the step two;
and step four, the water circulation control system adjusts the opening of the electric ball valve by using an incremental PID control algorithm based on the liquid level difference, so that the liquid levels of the front and rear water tank groups are dynamically balanced.
The invention has the beneficial effects that:
1. when the gravity center allocation system performs water circulation adjustment, all water tanks in the front and rear water tank groups are all involved in adjustment. All water tanks participate in work simultaneously, more water can participate in heat dissipation of the simulation electric load, larger heat capacity and larger heat dissipation capacity are provided, the duration of high-power continuous operation of the simulation electric load is prolonged, and the completion degree of the test flight subjects of single test flight shelves is improved.
2. By monitoring the liquid level difference of the highest liquid levels of the front and rear water tank groups, the water flows on the two sides of the water circulation system can be ensured to be consistent as much as possible, the water quantity in the front and rear water tank groups is ensured to be balanced, and the circulating water cools the surface of the load, so that the problem that the temperature of the surface of the load is too high due to a large amount of heat generated by the conventional electric load system during working is solved; the incremental PID control algorithm based on the liquid level difference has stronger robustness, and the working stability of the system can be further ensured.
3. All control algorithms are realized based on the design of a Field Programmable Gate Array (FPGA), the rapidity and the stability of complete reconfiguration and hardware timing provided by the FPGA are fully utilized, the real-time performance of the algorithms is ensured, and the accurate synchronization of sensor calculation and execution mechanism implementation is ensured.
Drawings
FIG. 1 is a block diagram of the overall scheme of the invention for connecting an electrical load system to a water circulation system;
FIG. 2 is a layout of water circulation system, wherein 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 are water inlet and outlet holes of each water tank, including (i), (ii), (iii), (iv), (v), (c), (d), (c,
The water tank is composed of a water tank body, water pumps B1, B2, B3 and B4, manual ball valves 17, 18, 23 and 24 and electric ball valves 19, 20, 21 and 22;
FIG. 3 is a schematic view of the water flow direction of the water circulation into the load tank;
FIG. 4 is a flow chart of tank level adjustment.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1, 2, 3, and 4, and the specific process of the method for controlling the simulated electric load cooling water circulation system of the present embodiment is as follows:
the technical scheme adopted for solving the problem is as follows: the water circulation control system collects liquid level information through the liquid level sensor and conducts summary analysis, real-time circulation adjustment of water in the water tank of the gravity allocation system is achieved through control logic, the electric load system is connected into the cabin water circulation system in a safe and reasonable mode, and the overall design scheme is shown in figure 1.
The method comprises the following steps that firstly, a simulated electric load heat dissipation water circulation system is arranged, and the simulated electric load heat dissipation water circulation system is started (when the simulated electric load heat dissipation system starts to work, a water pump set, an electric ball valve and a manual ball valve in the simulated electric load heat dissipation water circulation system are in a starting state, so that water can circulate, and heat generated by a resistive load is taken away);
secondly, simulating an electric load heat dissipation water circulation system to monitor the liquid level difference of the front water tank group and the rear water tank group in real time;
step three, judging whether the highest liquid level difference of the front and rear water tank groups is larger than a set value, if so, executing the step four, and if not, executing the step two;
and step four, the water circulation control system adjusts the opening of the electric ball valve by using an incremental PID control algorithm based on the liquid level difference, so that the liquid levels of the front and rear water tank groups are dynamically balanced.
The second embodiment is as follows: the first embodiment is different from the first embodiment in that the simulated electric load heat dissipation water circulation system in the first step comprises a water circulation system, a simulated electric load system and a water circulation control system;
the water-cooling heat dissipation of the analog electric load system is mainly realized by a water circulation system, fig. 2 is a layout design diagram of a water tank and a pipeline of the water circulation system, and a load box of the analog electric load system is connected to a middle pipeline of the water circulation system, and is positioned as shown by an arrow in fig. 2;
as can be seen from fig. 2, the water circulation system includes a cabin front water tank set and a cabin rear water tank set;
the analog electric load system comprises a load box group 1 and a load box group 2;
the load tank group 1 is positioned between the cabin front water tank group and the cabin rear water tank group;
the load tank group 2 is positioned between the cabin front water tank group and the cabin rear water tank group;
the load box group 1 at least comprises 1 load box;
the load box group 2 at least comprises 1 load box;
the water circulation system also comprises a water pump group 1 and a water pump group 2;
the water pump set 1 is arranged between the load tank set 1 and the cabin rear water tank set;
the water pump set 2 is arranged between the load tank set 2 and the rear water tank set of the passenger cabin;
the water pump group 1 at least comprises 1 water pump;
the water pump group 2 at least comprises 1 water pump;
the water circulation control system collects liquid level data of front and rear water tank groups of the passenger cabin and monitors liquid level difference of the front and rear water tank groups in real time.
Other steps and parameters are the same as those in the first embodiment.
The third concrete implementation mode: the difference between the first embodiment and the second embodiment is that the water circulation system further comprises an electric ball valve 19, an electric ball valve 20, an electric ball valve 21 and an electric ball valve 22;
the electric ball valve 19 and the electric ball valve 20 are positioned between the load tank group 1 and the rear water tank group of the passenger cabin;
the electric ball valve 21 and the electric ball valve 22 are located between the load tank group 2 and the cabin rear water tank group.
Other steps and parameters are the same as those in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is that the water circulation system further includes a manual ball valve 17, a manual ball valve 18, a manual ball valve 23, and a manual ball valve 24;
the manual ball valve 17 is positioned between the load tank group 1 and the rear water tank group of the passenger cabin;
the manual ball valve 18 is positioned between the load tank group 2 and the rear water tank group of the passenger cabin;
the manual ball valve 23 is connected with a front water tank group of the passenger cabin;
the manual ball valve 24 is connected with a water tank group at the rear part of the passenger cabin.
Other steps and parameters are the same as those in one of the first to third embodiments.
The fifth concrete implementation mode: the difference between the first embodiment and the fourth embodiment is that the front water tank group of the passenger cabin comprises 8 water tanks which are respectively (i), (ii), (iii), (iv), (v), (c), (v), and (v);
the rear water tank group of the passenger cabin comprises 8 water tanks which are respectively ninthly, r,
The front part of the passenger cabin is divided into 2 rows, and the 1 st row is provided with water tanks (I), (II), (III) and (IV) from left to right; the water tank in row 2 is divided into a fifth row, a sixth row, a seventh row and a sixth row from left to right;
the water tanks are communicated with one another, and the water tanks are communicated with one another;
the rear part of the passenger cabin is provided with 2 rows of water tanks ninthly, the R,
Row 2 from left to right is a water tank
The water tank ninthly, the water tank,
Are communicated with each other and the water tank
Are communicated with each other;
the water tank is divided into 8 groups, namely, a water tank and a water tank are divided into a water tank group, namely, a water tank group
R and
and
and
each group can discharge water and also can enter water; each group is communicated with each other; the air holes are connected, and the principle of communicating vessels is adopted;
the water flow direction in the water circulation system is as follows:
water tank in front of cabinWater tank, water tank, and sound in water tank set at rear part of cabin
Water tank in water tank group at rear part of passenger cabin
Discharging water, and pumping water into a water tank in a water tank group at the front part of the passenger cabin;
when the water circulation system works, the water pump set 1 pumps the water in the front water tank set of the passenger cabin to the water tank in the rear water tank set of the passenger cabin for the water in the water tank (ninon) in the front water tank set of the passenger cabin
The water pump set 2 is used for filling water in the water tank group at the rear part of the passenger cabin
The discharged water is pumped to a water tank in a water tank group at the front part of the passenger cabin through a load tank group 2.
As shown in fig. 3, the water flow direction connected to the load box is that the water inlet pipeline is used for introducing the circulating water of the water circulating system into the load box, and the water outlet pipeline is used for introducing the water flow after heat absorption into the next load box or the water circulating system.
The inside water-cooling wire winding resistance of load box is vertical to be placed, adopts the circulation to advance the mode of going up out under water and realizes the heat dissipation, can guarantee that the water-cooling resistance is inside to be full of the cooling water.
Other steps and parameters are the same as in one of the first to fourth embodiments.
The sixth specific implementation mode: the difference between the first embodiment and the fifth embodiment is that the water circulation control system in the fourth step adjusts the opening of the electric ball valve by using an incremental PID control algorithm based on the liquid level difference, so that the liquid levels of the front and rear water tank groups are dynamically balanced; the specific process is as follows:
when the water circulation works, the water pump B1 or B2 pumps the water in the front water tank group to the rear water tank group, and the water pump B3 or B4 pumps the water in the rear water tank group to the front water tank group. In order to ensure that the water flows on the two sides are consistent, the control module controls the difference between the highest liquid level of the front water tank group and the highest liquid level of the rear water tank group based on a PID algorithm.
The core purpose of the control is to ensure the water quantity balance of the front and the rear water tank groups, namely, the optimal state is that the water quantity in the front and the rear water tank groups is kept unchanged during operation, but the system cannot be completely designed according to symmetry due to the limitation of the layout area of the system. In addition, an attitude angle exists in the flying process of the airplane, and the factors cause uneven water flow speed of each water tank when the center of gravity is adjusted. There may be some tanks with a rapid drop in level and some tanks with a rapid rise. Even if the flow rates of the forward adjustment and the backward adjustment are completely consistent, the liquid level of some water tanks can be quickly raised, and the falling speed of some water tanks is quick.
In order to further ensure the stability of the system operation, the control system keeps the forward-regulated flow rate unchanged, and when the liquid level difference between the highest liquid levels of the front and rear water tank groups is monitored, the backward-regulated flow rate is controlled based on an incremental PID algorithm, namely the opening degree of the electric ball valve 19 or 20 is regulated, and the regulation flow is shown in FIG. 4.
The water circulation system also comprises an electric ball valve 19, an electric ball valve 20, an electric ball valve 21 and an electric ball valve 22;
the electric ball valve 19 and the electric ball valve 20 are positioned between the load tank group 1 and the rear water tank group of the passenger cabin;
the electric ball valve 21 and the electric ball valve 22 are positioned between the load tank group 2 and the rear water tank group of the passenger cabin;
when the water circulation system works, the water pump set 1 pumps the water in the front water tank set of the passenger cabin to the water tank in the rear water tank set of the passenger cabin for the water in the water tank (ninon) in the front water tank set of the passenger cabin
The water pump set 2 is used for filling water in the water tank group at the rear part of the passenger cabin
The discharged water is pumped to a water tank in a water tank group at the front part of the passenger cabin through a load tank group 2;
when the liquid level of the water tank in the front water tank group of the passenger cabin is higher than that of the water tank in the rear water tank group of the passenger cabin, the water circulation control system increases the opening degrees of the electric ball valve 19 and the electric ball valve 20 to increase the backward adjusting speed of the water flow;
the control quantity of the opening degree is obtained by an incremental PID algorithm, the control algorithm based on the liquid level difference has stronger robustness, at the moment, the liquid level of the front water tank group can be gradually reduced, and the liquid level of the rear water tank group can be gradually increased;
when the liquid level of the water tank in the water tank group at the front part of the passenger cabin is lower than that of the water tank in the water tank group at the rear part of the passenger cabin, the water circulation control system reduces the opening degree of the electric ball valve 19 and the electric ball valve 20 to reduce the speed of backward regulation of water flow; at the moment, the liquid level of the front water tank group can be gradually increased, and the liquid level of the rear water tank group can be gradually decreased;
the dynamic balance of the liquid levels of the front and rear water tank groups in the adjusting process is ensured.
Realization of water circulation control algorithm of electric load heat dissipation system based on FPGA
The control strategy is the core of the water circulation control algorithm of the electric load heat dissipation system, but the real-time performance of the algorithm is the key of the efficiency, and in order to ensure that the calculation of the sensor and the implementation of the actuating mechanism can be accurately and synchronously, all the control algorithms are designed based on a field programmable logic device (FPGA), the control logic is realized in a digital chip, and the real-time performance and the accuracy of the automatic control logic are further ensured.
Other steps and parameters are the same as those in one of the first to fifth embodiments.
The present invention is capable of other embodiments and its several details are capable of modifications in various obvious respects, all without departing from the spirit and scope of the present invention.
Claims (6)
1. The control method of the simulated electric load heat dissipation water circulation system is characterized in that: the method comprises the following specific processes:
step one, setting a simulated electric load heat dissipation water circulation system, and starting the simulated electric load heat dissipation water circulation system;
secondly, simulating an electric load heat dissipation water circulation system to monitor the liquid level difference of the front water tank group and the rear water tank group in real time;
step three, judging whether the highest liquid level difference of the front and rear water tank groups is larger than a set value, if so, executing the step four, and if not, executing the step two;
and step four, the water circulation control system adjusts the opening of the electric ball valve by using an incremental PID control algorithm based on the liquid level difference, so that the liquid levels of the front and rear water tank groups are dynamically balanced.
2. The method of claim 1, wherein the method further comprises: the simulated electric load heat dissipation water circulation system in the first step comprises a water circulation system, a simulated electric load system and a water circulation control system;
the water circulation system comprises a cabin front water tank group and a cabin rear water tank group;
the analog electric load system comprises a load box group 1 and a load box group 2;
the load tank group 1 is positioned between the cabin front water tank group and the cabin rear water tank group;
the load tank group 2 is positioned between the cabin front water tank group and the cabin rear water tank group;
the load box group 1 at least comprises 1 load box;
the load box group 2 at least comprises 1 load box;
the water circulation system also comprises a water pump group 1 and a water pump group 2;
the water pump set 1 is arranged between the load tank set 1 and the cabin rear water tank set;
the water pump set 2 is arranged between the load tank set 2 and the rear water tank set of the passenger cabin;
the water pump group 1 at least comprises 1 water pump;
the water pump group 2 at least comprises 1 water pump;
the water circulation control system collects liquid level data of front and rear water tank groups of the passenger cabin and monitors liquid level difference of the front and rear water tank groups in real time.
3. The method of claim 2, wherein the method further comprises: the water circulation system also comprises an electric ball valve 19, an electric ball valve 20, an electric ball valve 21 and an electric ball valve 22;
the electric ball valve 19 and the electric ball valve 20 are positioned between the load tank group 1 and the rear water tank group of the passenger cabin;
the electric ball valve 21 and the electric ball valve 22 are located between the load tank group 2 and the cabin rear water tank group.
4. The method of claim 3, wherein the method further comprises: the water circulation system also comprises a manual ball valve 17, a manual ball valve 18, a manual ball valve 23 and a manual ball valve 24;
the manual ball valve 17 is positioned between the load tank group 1 and the rear water tank group of the passenger cabin;
the manual ball valve 18 is positioned between the load tank group 2 and the rear water tank group of the passenger cabin;
the manual ball valve 23 is connected with a front water tank group of the passenger cabin;
the manual ball valve 24 is connected with a water tank group at the rear part of the passenger cabin.
5. The method of claim 4, wherein the method further comprises: the front water tank group of the passenger cabin comprises 8 water tanks which are respectively a first water tank, a second water tank, a third water tank, a fourth water tank, a fifth water tank, a sixth water tank, a seventh water tank and a seventh water tank;
the rear water tank group of the passenger cabin comprises 8 water tanks which are respectively ninthly, r,
The front part of the passenger cabin is divided into 2 rows, and the 1 st row is provided with water tanks (I), (II), (III) and (IV) from left to right; the water tank in row 2 is divided into a fifth row, a sixth row, a seventh row and a sixth row from left to right;
the water tanks are communicated with one another, and the water tanks are communicated with one another;
the rear part of the passenger cabin is provided with 2 rows of water tanks ninthly, the R,
Row 2 from left to right is a water tank
The water tank ninthly, the water tank,
Are communicated with each other and the water tank
Are communicated with each other;
the water tank is divided into 8 groups, namely, a water tank and a water tank are divided into a water tank group, namely, a water tank group
R and
and
and
each group can discharge water and also can enter water; each group is communicated with each other;
the water flow direction in the water circulation system is as follows:
water tank in front of cabin
Water tank in water tank group at rear part of passenger cabin
The water is discharged out of the water tank,seventhly, water is filled into a water tank in the front water tank group of the passenger cabin;
when the water circulation system works, the water pump set 1 pumps the water in the front water tank set of the passenger cabin to the water tank in the rear water tank set of the passenger cabin for the water in the water tank (ninon) in the front water tank set of the passenger cabin
The water pump set 2 is used for filling water in the water tank group at the rear part of the passenger cabin
The discharged water is pumped to a water tank in a water tank group at the front part of the passenger cabin through a load tank group 2.
6. The method of claim 5, wherein the method further comprises: the water circulation control system in the fourth step adjusts the opening of the electric ball valve by using an incremental PID control algorithm based on the liquid level difference, so that the liquid levels of the front and rear water tank groups are dynamically balanced; the specific process is as follows:
when the water circulation system works, the water pump set 1 pumps the water in the front water tank set of the passenger cabin to the water tank in the rear water tank set of the passenger cabin for the water in the water tank (ninon) in the front water tank set of the passenger cabin
The water pump set 2 is used for filling water in the water tank group at the rear part of the passenger cabin
The discharged water is pumped to a water tank in a water tank group at the front part of the passenger cabin through a load tank group 2;
when the liquid level of the water tank in the front water tank group of the passenger cabin is higher than that of the water tank in the rear water tank group of the passenger cabin, the water circulation control system increases the opening degrees of the electric ball valve 19 and the electric ball valve 20 to increase the backward adjusting speed of the water flow;
the control quantity of the opening degree is obtained by an incremental PID algorithm;
when the liquid level of the water tank in the water tank group at the front part of the passenger cabin is lower than that of the water tank in the water tank group at the rear part of the passenger cabin, the water circulation control system reduces the opening degree of the electric ball valve 19 and the electric ball valve 20 to reduce the speed of backward regulation of water flow;
the dynamic balance of the liquid levels of the front and rear water tank groups in the adjusting process is ensured.
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