CN117016270A - Liquid nitrogen sowing control system of rain-increasing airplane - Google Patents

Abstract

The application provides a liquid nitrogen sowing control system of a rain-increasing airplane, which belongs to the technical field of artificial rain increase, and a specific display control computer obtains sensor data of each liquid nitrogen tank through a bus to obtain a pressure value and a liquid nitrogen allowance; the display control computer calculates the average sowing rate through the allowance; the pressure change graph of the liquid nitrogen storage tank and the change graph of the average liquid nitrogen sowing speed are displayed in real time through the human-computer interaction interface, weather staff are assisted to control sowing operation, calculate sowing quantity and analyze the rain increasing catalytic effect. The control decision method can reflect the current liquid nitrogen sowing condition, realize the purpose of sowing liquid nitrogen and condensing the air to increase the rain, and effectively improve the efficiency of artificially influencing the weather.

Description

A rain-enhancing aircraft liquid nitrogen spreading control system

Technical field

The present application relates to the field of artificial rainfall, and in particular, to a liquid nitrogen seeding control system for rainfall enhancement aircraft.

Background technique

At present, the use of artificial rainfall technology has become more and more widespread. It can make the weather change in the direction predetermined by humans and avoid or mitigate meteorological disasters. That is, based on the atmospheric environment and cloud physics observation information as professional criteria, meteorologists propose catalytic A comprehensive plan for the operation, including catalyst type, catalytic time, catalytic area, etc., uses aerial operation equipment to spread catalyst in the clouds to achieve precipitation.

The application of cold cloud catalyst is an important technology for artificial weather modification. Its principle is to put an appropriate amount of refrigerant or artificial ice nuclei into cold clouds with a temperature below 0°C, so that the cold clouds produce a certain number of ice crystals, thereby achieving the precipitation effect. . Both dry ice and liquid nitrogen are effective catalysts in cold cloud catalysis, but dry ice has limitations in aircraft transportation and storage, so liquid nitrogen is widely used in aircraft rain enhancement technology. Among them, liquid nitrogen has a low vaporization temperature, a stable nucleation rate, and is cheap and easy to prepare. Since nitrogen accounts for a large proportion of the air, liquid nitrogen is an economical, green and environmentally friendly catalyst. The flow control of liquid nitrogen and the actual spreading amount also affect the rain formation process and precipitation range. However, with the existing technology, meteorologists can only obtain the remaining percentage in the liquid nitrogen storage tank and cannot obtain the accurate spreading amount in real time.

Contents of the invention

In view of this, this application provides a rain-enhancing aircraft liquid nitrogen spreading control system, which solves the problems in the existing technology. Meteorologists can grasp the actual liquid nitrogen spreading situation in a timely manner, and can better determine the actual liquid nitrogen spreading situation based on the actual meteorological data of the current area. Ground analysis of rainfall enhancement effect.

The rain-enhancing aircraft liquid nitrogen seeding control system provided by this application adopts the following technical solution:

A rain-enhancing aircraft liquid nitrogen seeding control system, including a liquid nitrogen tank, a display control computer responsible for human-computer interaction, and a liquid nitrogen controller. The display control computer communicates with the liquid nitrogen controller through a serial port, and the liquid nitrogen The controller is connected to multiple liquid nitrogen tanks, and the liquid nitrogen controller uploads the status data, pressure data and residual data of the liquid nitrogen tanks to the display and control computer through sensors;

The display and control computer sends operating instructions to the liquid nitrogen controller for controlling the liquid nitrogen controller. After receiving the operating instructions, the liquid nitrogen controller controls the spreading state of the liquid nitrogen tank;

The software configuration of the display and control computer includes a main module responsible for the human-computer interaction interface and a liquid nitrogen spreading sub-module that processes liquid nitrogen controller information. The main module and the liquid nitrogen spreading sub-module interact through Ethernet. The main module Send the operating instructions to the liquid nitrogen spreading sub-module. The liquid nitrogen spreading sub-module receives the instructions from the main module and passes them to the liquid nitrogen controller. After receiving the operating instructions, the liquid nitrogen controller controls the spreading status of the liquid nitrogen tank. , and receives the response of the liquid nitrogen controller and passes it to the main module for status display.

Optionally, the human-computer interaction interface of the main module displays a graph of the average liquid nitrogen spreading rate changing with time.

Optionally, the liquid nitrogen seeding sub-module calculates the average seeding rate by combining the volume, time difference and margin difference of the liquid nitrogen storage tank. Average rate = liquid level change/liquid level change time. The liquid nitrogen seeding sub-module will average The rate points are fed back to the main module, and the average rate is displayed on the interface in the form of a curve graph.

Optionally, the human-computer interaction interface of the main module displays a graph of the pressure value of each liquid nitrogen tank changing with time, and the liquid nitrogen spreading sub-module periodically queries the liquid nitrogen controller to obtain the pressure of each liquid nitrogen tank. The current pressure value of each liquid nitrogen tank is periodically fed back to the main module. The human-computer interaction interface of the main module intuitively reflects the pressure changes of each liquid nitrogen tank with curves of four different colors.

Optionally, the human-computer interaction interface of the main module has a pressure satisfaction status light, indicating whether the current pressure allows liquid nitrogen seeding. The liquid nitrogen seeding sub-module periodically queries the pressure status of all liquid nitrogen tanks. If the liquid nitrogen seeding sub-module is The nitrogen controller returns that the current pressure is satisfied, and the liquid nitrogen spreading sub-module uploads the message to the main module. The pressure-satisfied status light of the main module is green, informing meteorologists that liquid nitrogen can be spread; if the liquid nitrogen controller returns that the current pressure If not, the spreading sub-module uploads the message to the main module, and the main module's pressure-satisfying status light turns red, informing the meteorological personnel that liquid nitrogen cannot be spread.

Optionally, the display and control computer background will form a sowing log record after each sowing operation is completed. The record is named after the year, month, day and the start time of the main module. The specific content of the log record includes the catalyst type, sowing time, stop Time and spreading amount.

Optionally, the human-computer interaction interface of the main module includes a liquid nitrogen spreading sub-interface and a setting and maintenance sub-interface;

The recommended catalytic scheme is displayed on the liquid nitrogen spreading sub-interface, showing the current best liquid nitrogen spreading rate and current catalytic level to the operator. The displayed best liquid nitrogen spreading rate includes one of fast, medium and slow, and the catalytic level Including excellent, good, medium, low and none;

The setting maintenance sub-interface displays the cold cloud catalytic condition criterion configuration table. Meteorologists enter the matching ratios of cloud particle number concentration and ice crystal number concentration under different catalytic levels in the cold cloud catalytic condition criterion configuration table, and then enter different catalytic conditions. Appropriate liquid nitrogen spreading rate for grade;

The display control computer obtains the ambient temperature of the aircraft's comprehensive meteorological measurement system. If it is greater than 0°C, it is not suitable for spreading liquid nitrogen. The recommended catalytic solution for the liquid nitrogen spreading interface shows a spreading rate of 0; if it is less than 0°C, the display control computer obtains the number of cloud particles. concentration and water content. When the cloud particle number concentration is greater than 0.5 or the water content is greater than 0.001, the current environment meets the cold cloud conditions and is suitable for liquid nitrogen seeding; when the cold cloud conditions are met, the display control computer obtains the ice crystal number concentration and automatically The cloud particle number concentration and ice crystal number concentration are compared with the concentration information in the cold cloud catalytic condition criterion configuration table input by the meteorologist, and the current catalytic level is determined. The catalytic level and optimal spreading rate are automatically displayed on the liquid nitrogen interface.

To sum up, this application includes the following beneficial technical effects:

The on-board liquid nitrogen spreading, stop and rate are controlled through human-computer interaction; a simple algorithm is used to display the average liquid nitrogen spreading rate change chart in real time, providing calculation conditions for meteorologists to obtain the real spreading amount. The main module of the display and control computer displays the pressure value change chart of each liquid nitrogen tank in real time, making it easier for meteorologists to grasp the liquid nitrogen spreading conditions and analyze the impact of liquid nitrogen pressure on the rainfall enhancement effect.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. Those skilled in the art can also obtain other drawings based on these drawings without exerting creative efforts.

Figure 1 is a structural block diagram of the liquid nitrogen seeding control system of the rain-enhancing aircraft of this application.

Detailed ways

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The following describes the implementation of the present application through specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. This application can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, as long as there is no conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

To illustrate, the following describes various aspects of embodiments that are within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is illustrative only. Based on this application, those skilled in the art will appreciate that one aspect described herein can be implemented independently of any other aspect, and that two or more of these aspects can be combined in various ways. For example, apparatuses may be implemented and/or methods practiced using any number of aspects set forth herein. Additionally, such apparatus may be implemented and/or methods practiced using other structures and/or functionality in addition to one or more of the aspects set forth herein.

It should also be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present application. The drawings only show the components related to the present application and are not based on the number, shape and number of components during actual implementation. Dimension drawing, in actual implementation, the type, quantity and proportion of each component can be arbitrarily changed, and the component layout type may also be more complex.

Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, one skilled in the art will understand that the described aspects may be practiced without these specific details.

The embodiment of the present application provides a rain-enhancing aircraft liquid nitrogen seeding control system.

As shown in Figure 1, a rain-enhancing aircraft liquid nitrogen seeding control system includes a liquid nitrogen tank, a display control computer responsible for human-computer interaction, and a liquid nitrogen controller. The display control computer and the liquid nitrogen controller communicate through RS -485 serial port communication, the liquid nitrogen controller is connected to multiple liquid nitrogen tanks, and the liquid nitrogen controller uploads the status data, pressure data and residual data of the liquid nitrogen tanks to the display and control computer through sensors;

The display and control computer sends operating instructions to the liquid nitrogen controller for controlling the liquid nitrogen controller. After receiving the operating instructions, the liquid nitrogen controller controls the spreading state of the liquid nitrogen tank;

The software configuration of the display and control computer includes a main module responsible for the human-computer interaction interface and a liquid nitrogen spreading sub-module that processes liquid nitrogen controller information. The main module and the liquid nitrogen spreading sub-module interact through Ethernet. The module receives the heartbeat frame of the main module every second to confirm the running status of the main module. If the sub-module cannot receive the heartbeat frame of the main module, it will automatically exit. The main module queries the running status of the sub-module in the task manager every minute. If it is not found, The submodule process restarts the submodule to ensure normal communication between the two modules. Meteorological personnel operate the liquid nitrogen controller on the main module interface. The main module sends operating instructions to the liquid nitrogen spreading sub-module. The liquid nitrogen spreading sub-module receives the instructions from the main module and passes them to the liquid nitrogen controller. The liquid nitrogen controller controls the spreading state of the liquid nitrogen tank after receiving the operation command, and receives the response of the liquid nitrogen controller and transmits it to the main module for status display.

Specific operation instructions include start spreading instructions, stop spreading instructions, and rate control instructions. On the main module interface, they correspond to the "spread" button, the "stop" button, and the three speed gears of "fast", "medium", and "slow". Direct user operation. The liquid nitrogen spreading sub-module automatically and periodically issues controller status query instructions, pressure satisfaction query instructions, first tank remaining capacity query instructions, second tank residual capacity query commands, and third tank residual capacity query commands to the liquid nitrogen controller. Instructions: query the fourth tank balance command, query the first tank pressure command, query the second tank pressure command, query the third tank pressure command, query the fourth tank pressure command. The response of the liquid nitrogen controller specifically includes seeding response, abort response, rate response, pressure state response to meet the seeding conditions, pressure value response of each liquid nitrogen tank, margin value response of each liquid nitrogen tank, and fault information.

The human-computer interaction interface of the main module displays a graph showing the change of the average rate of liquid nitrogen spreading with time.

The liquid nitrogen spreading sub-module combines the volume, time difference and margin difference of the liquid nitrogen storage tank to calculate the average spreading rate. The average rate = liquid level change/liquid level change time. The liquid nitrogen spreading sub-module feeds back the average rate point to The main module and displays the average rate on the interface in the form of a graph.

The human-computer interaction interface of the main module displays a graph of the pressure value of each liquid nitrogen tank changing with time. The liquid nitrogen spreading sub-module periodically queries the liquid nitrogen controller to obtain the current pressure value of each liquid nitrogen tank. , and periodically feeds back the pressure value of each liquid nitrogen tank to the main module. The human-computer interaction interface of the main module intuitively reflects the pressure changes of each liquid nitrogen tank with curves of four different colors.

The human-computer interaction interface of the main module has a pressure satisfaction status light, indicating whether the current pressure allows liquid nitrogen seeding. The liquid nitrogen seeding sub-module periodically queries the pressure status of all liquid nitrogen tanks. If the liquid nitrogen controller replies When the current pressure is satisfied, the liquid nitrogen spreading sub-module uploads the message to the main module. The pressure-satisfying status light of the main module is green, informing the meteorological personnel that liquid nitrogen can be spread; if the liquid nitrogen controller replies that the current pressure is not satisfied, the The spreading sub-module uploads the message to the main module, and the pressure-satisfaction status light of the main module is red, informing the meteorological personnel that liquid nitrogen cannot be spread.

After the liquid nitrogen spreading sub-module queries whether the pressure status is satisfied, it periodically queries the liquid nitrogen controller for the pressure values of the four tanks and receives the pressure value response in real time. After analyzing and integrating the pressure values, the sub-module feeds back the pressure values of multiple liquid nitrogen tanks to the main module every second, and the main module draws curves. The x-axis of the curve is time (mm:ss), and the y-axis is pressure (-0.01MPa-0.2MPa). The pressures of multiple liquid nitrogen tanks are distinguished by different colors, which can intuitively and truly display liquid nitrogen on the display and control computer interface. The pressure changes in the tank help meteorologists analyze the impact of current pressure, spreading amount, and catalytic effect. Since the rate of the liquid nitrogen spreading interface is uniformly controlled by all liquid nitrogen tanks, when the interface shows that the pressure value of a certain tank is abnormal (overpressure or too low pressure), the valve of the liquid nitrogen tank can be manually controlled to control the pressure, and then control a certain tank. Spreading rate and amount.

Although the rate control has three gears: fast (6L/min), medium (4L/min), and slow (2L/min), since four tanks can be spread at the same time, it is more accurate to obtain the average rate sum of the four liquid nitrogen tanks. Useful for calculating liquid nitrogen spreading dosage. When the meteorologist starts spreading liquid nitrogen, the main module interface displays the average spreading rate curve of the liquid nitrogen tank in real time. The x-axis of the curve is time (mm:ss), and the y-axis is the spreading rate (0L/min-10L/min). . The liquid nitrogen spreading sub-module periodically queries the liquid nitrogen controller for the remaining amount of each tank. If the sub-module detects a change in the balance of tank n, the sub-module automatically calculates the overall average rate of all liquid nitrogen tanks, first calculating the rate of each liquid nitrogen tank at the current moment:

The rate is the ratio of the balance difference to the time difference (min), where T _2n and T _1n are the current time and the previous cycle time, L _2n and L _1n are the balance percentage of the nth tank at the current time and the nth tank in the previous cycle. The remaining percentage, L _is the liquid nitrogen tank volume (in liters), and V _n is the speed of the n tank. Then the average total spreading speed at the current time is the sum of the speeds of the four liquid nitrogen tanks:

V _total =V ₁ +V ₂ +V ₃ +V ₄

The liquid nitrogen seeding sub-module feeds back the rate point to the main module for curve drawing. As long as the balance of any liquid nitrogen tank changes, the sub-module will automatically calculate and output the rate point. If there is no change in the balance, the rate of the liquid nitrogen tank at the current moment will remain consistent with the rate at the previous moment.

After the plane takes off, the meteorological personnel start the mission system, and the liquid nitrogen seeding sub-module actively shakes hands with the liquid nitrogen controller and queries the remaining amount of each liquid nitrogen tank, obtains the initial controller status and initial remaining amount, and sends it to the human-computer interaction The main module of the interface is displayed. If the liquid nitrogen controller status light on the main module interface is green, it means the controller status is normal. If it is red, it means there is no communication or there is a fault. Specific fault information (overpressure alarm, nozzle blockage, power overload) will be displayed below the status light. The initial balance will be displayed on the main module interface as a percentage of the liquid nitrogen storage tank volume.

The backend of the display and control computer will form a sowing log record after each sowing operation is completed. The record is named after the year, month, day and the startup time of the main module. The specific content of the log record includes the type of catalyst (liquid nitrogen), sowing time (hh :mm:ss), stop time (hh:mm:ss), spreading amount (volume percentage). Based on this record, meteorologists can calculate the actual amount of liquid nitrogen sowing by combining it with the average spreading rate curve. Combined with the pressure change, they can evaluate the impact of liquid nitrogen status and flow control on artificial precipitation, which will help to better complete the human shadow operation task in the future.

The human-computer interaction interface of the main module includes a liquid nitrogen spreading sub-interface and a setting and maintenance sub-interface;

The recommended catalytic scheme is displayed on the liquid nitrogen spreading sub-interface, showing the current best liquid nitrogen spreading rate and current catalytic level to the operator. The displayed best liquid nitrogen spreading rate includes one of fast, medium and slow, and the catalytic level Including excellent, good, medium, low and none;

The setting maintenance sub-interface displays the cold cloud catalytic condition criterion configuration table. Meteorologists enter the matching ratios of cloud particle number concentration and ice crystal number concentration under different catalytic levels in the cold cloud catalytic condition criterion configuration table, and then enter different catalytic conditions. Appropriate liquid nitrogen spreading rate for grade;

The display control computer obtains the ambient temperature of the aircraft's comprehensive meteorological measurement system. If it is greater than 0°C, it is not suitable for spreading liquid nitrogen. The recommended catalytic solution for the liquid nitrogen spreading interface shows a spreading rate of 0; if it is less than 0°C, the display control computer obtains the number of cloud particles. concentration and water content. When the cloud particle number concentration is greater than 0.5 or the water content is greater than 0.001, the current environment meets the cold cloud conditions and is suitable for liquid nitrogen seeding; when the cold cloud conditions are met, the display control computer obtains the ice crystal number concentration and automatically The cloud particle number concentration and ice crystal number concentration are compared with the concentration information in the cold cloud catalytic condition criterion configuration table input by the meteorologist, and the current catalytic level is determined. The catalytic level and optimal spreading rate are automatically displayed on the liquid nitrogen interface.

Specifically, the meteorological data collected by each meteorological probe can be uploaded to the display and control computer through Ethernet. The meteorological probes include Aircraft Integrated Meteorological Measurement System (AI MMS), Cloud Particle Spectrum Probe (CDP), Fast Cloud Droplet Probe (FCDP), Liquid Water content meter (LWC). When preparing to start rainfall enhancement operations, meteorologists need to enter the matching ratio of cloud particle number concentration and ice crystal number concentration under different catalytic levels in the cold cloud catalytic condition criterion configuration table, and then enter the appropriate liquid nitrogen seeding under different catalytic levels. rate, and finally click the OK button under the cold cloud catalytic condition criterion configuration in the maintenance interface. The display control computer actively obtains the ambient temperature of the AI MMS. If it is greater than 0°C, it is not suitable for spreading liquid nitrogen. The recommended catalysis of the liquid nitrogen spreading interface The plan shows that the spreading rate is 0; if it is less than 0°C, the display control computer will actively obtain the cloud particle number concentration and water content. CDP is the first choice for cloud particle number concentration. If CDP fails, FCDP is the second choice. CDP is the first choice for water content data. If CDP fails, LWC is the second choice. When the cloud particle number concentration is greater than 0.5 or the water content is greater than 0.001, the current environment meets cold cloud conditions and is suitable for liquid nitrogen seeding.

When the cold cloud conditions are met, the display and control computer obtains the ice crystal number concentration of the meteorological probe. The probe priority for obtaining the ice crystal number concentration is the same as the cloud particle number concentration, and automatically compares the cloud particle number concentration and ice crystal number concentration with those entered by the meteorologist. Lengyun catalytic condition criteria compares the concentration information in the configuration table to determine the current catalytic level. The catalytic level and optimal spreading rate are automatically displayed on the liquid nitrogen interface, and meteorologists can operate according to the catalytic plan. This system embodies the high degree of automation of rainfall enhancement operations. The display and control computer obtains meteorological data and decides on the best operation plan, without the need for meteorological personnel to manually decide on the operation plan.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. All are covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (7)

1. The liquid nitrogen sowing control system of the rain-increasing airplane is characterized by comprising a liquid nitrogen tank, a display control computer responsible for man-machine interaction and a liquid nitrogen controller, wherein the display control computer is communicated with the liquid nitrogen controller through a serial port, the liquid nitrogen controller is connected with a plurality of liquid nitrogen tanks, and the liquid nitrogen controller uploads state data, pressure data and residual data of the liquid nitrogen tanks to the display control computer through sensors;

the display control computer sends an operation instruction to the liquid nitrogen controller for controlling the liquid nitrogen controller, and the liquid nitrogen controller receives the operation instruction and then controls the broadcasting state of the liquid nitrogen tank;

the software configuration of the display control computer comprises a main module responsible for a man-machine interaction interface and a liquid nitrogen broadcasting submodule for processing information of a liquid nitrogen controller, wherein the main module and the liquid nitrogen broadcasting submodule interact through Ethernet, the main module transmits an operation instruction to the liquid nitrogen broadcasting submodule, the liquid nitrogen broadcasting submodule receives the instruction of the main module and transmits the instruction to the liquid nitrogen controller, and the liquid nitrogen controller receives the operation instruction and then controls the broadcasting state of a liquid nitrogen tank, receives the response of the liquid nitrogen controller and transmits the response to the main module for state display.

2. The system of claim 1, wherein the man-machine interface of the main module displays a graph of average liquid nitrogen spreading rate over time.

3. The liquid nitrogen sowing control system of the rain-increasing aircraft according to claim 1, wherein the liquid nitrogen sowing submodule calculates an average sowing rate by combining the volume of the liquid nitrogen storage tank, the time difference and the margin difference, the average rate=liquid level change/liquid level change time, and the liquid nitrogen sowing submodule feeds back an average rate point to the main module and displays the average rate in a graph form on an interface.

4. The liquid nitrogen sowing control system of the rain-increasing airplane according to claim 3, wherein a graph of the pressure value of each liquid nitrogen tank changing with time is displayed on a man-machine interaction interface of the main module, the liquid nitrogen sowing submodule periodically inquires a liquid nitrogen controller to obtain the current pressure value of each liquid nitrogen tank, the pressure value of each liquid nitrogen tank is periodically fed back to the main module, and the man-machine interaction interface of the main module intuitively reflects the pressure change of each liquid nitrogen tank by four curves with different colors.

5. The liquid nitrogen broadcasting control system of the rain-increasing airplane according to claim 1, wherein a pressure-meeting status lamp is arranged on a man-machine interaction interface of the main module, and indicates whether the current pressure can allow liquid nitrogen broadcasting, the liquid nitrogen broadcasting submodule periodically inquires the pressure states of all liquid nitrogen tanks, and if the current pressure is met by the liquid nitrogen controller, the liquid nitrogen broadcasting submodule uploads a message to the main module, the pressure-meeting status lamp of the main module is green, and informs weather personnel that liquid nitrogen can be broadcasted; if the liquid nitrogen controller replies that the current pressure is not met, the broadcasting submodule uploads the message to the main module, and the pressure meeting status lamp of the main module is red, so that weather staff is informed that liquid nitrogen cannot be broadcasted.

6. The liquid nitrogen dispensing control system of the rain-increasing airplane according to claim 1, wherein the background of the display control computer forms a dispensing log record after each dispensing operation is completed, the record is named by the year, month and day and the starting time of the main module, and the specific content of the log record comprises the type of the catalyst, the dispensing time, the stopping time and the dispensing amount.

7. The rain-increasing airplane liquid nitrogen sowing control system according to claim 1, wherein the man-machine interaction interface of the main module comprises a liquid nitrogen sowing sub-interface and a setting maintenance sub-interface;

the liquid nitrogen sowing sub-interface displays a recommended catalysis scheme, and displays the current optimal sowing rate of liquid nitrogen and the current catalysis level to operators, wherein the displayed optimal sowing rate of liquid nitrogen comprises one of fast, medium and slow, and the catalysis level comprises excellent, good, medium, low and none;

the setting maintenance sub-interface displays a cold cloud catalysis condition criterion configuration table, a weather person inputs matching ratios of cloud particle number concentration and ice crystal number concentration under different catalysis levels in the cold cloud catalysis condition criterion configuration table, and then inputs proper liquid nitrogen sowing rates under different catalysis levels;

the display control computer acquires the environmental temperature of the comprehensive meteorological measurement system of the aircraft, if the environmental temperature is higher than 0 ℃, liquid nitrogen is not suitable for being sown, and the recommended catalysis scheme of the liquid nitrogen sowing interface displays the sowing rate of 0; if the temperature is lower than 0 ℃, the display control computer acquires the cloud particle number concentration and the water content, and when the cloud particle number concentration is higher than 0.5 or the water content is higher than 0.001, the current environment meets the cold cloud condition, and the liquid nitrogen sowing machine is suitable for liquid nitrogen sowing; when the cold cloud condition is met, the display control computer acquires the ice crystal number concentration, automatically compares the cloud particle number concentration and the ice crystal number concentration with concentration information in a cold cloud catalysis condition criterion configuration table input by a weather person, decides out the current catalysis grade, and automatically displays the catalysis grade and the optimal sowing rate on a liquid nitrogen interface.