CN-122021440-A - Method and system for determining slow-vehicle state quick oiling of large-scale conveyor

CN122021440ACN 122021440 ACN122021440 ACN 122021440ACN-122021440-A

Abstract

The invention discloses a method and a system for determining quick refueling of a slow vehicle state of a large-scale transporter, wherein the method comprises the steps of firstly establishing an airport environment database to be implemented irrespective of the vehicle refueling, wherein the database comprises a plurality of groups of airport environment samples, each group of airport environment samples comprises atmospheric pressure, environment temperature, environment wind direction angle and environment wind speed, taking each group of airport environment samples as sample working conditions, taking the nearest oil inlet engine as a calculation object, calculating the flow field temperature and speed under each sample working condition, recording a corresponding safe included angle, fitting the recorded safe included angle, establishing a quick refueling safe included angle calculation expression of the slow vehicle state of the large-scale transporter, and obtaining the atmospheric pressure, the environment temperature, the environment wind direction angle and the environment wind speed of the airport to be implemented irrespective of the vehicle refueling of the large-scale transporter to obtain the quick refueling safe included angle of the slow vehicle state of the large-scale transporter. On the basis of the obtained safety included angle, a slow-vehicle state quick oiling mode and a safety zone of the large-scale conveyor are determined.

Inventors

YANG LIJIAN
LIU KAI
WANG HAN
ZHANG XUAN
ZHU NING
MA XIN
LI MENG
SUN PENG
CHENG HAN

Assignees

中国人民解放军95616部队保障部

Dates

Publication Date: 20260512
Application Date: 20260203

Claims (9)

1. The method for determining the slow-vehicle state quick refueling of the large-scale conveyor is characterized by comprising the following steps of: step one, establishing an airport environment database for filling the vehicle without regard to implementation, wherein the database comprises a plurality of groups of airport environment samples, and each group of airport environment samples comprises atmospheric pressure, environment temperature, environment wind direction angle and environment wind speed; Taking each group of airport environmental samples in the first step as sample working conditions, taking the engine closest to the oil filling port as a calculation object, calculating the temperature and the speed of a flow field under each sample working condition, and recording a corresponding safety included angle; fitting the safety included angle recorded in the second step, and establishing a calculation expression of the quick oiling safety included angle of the slow-running state of the large-scale conveyor: , where null indicates that there is no safe working area, Indicating the temperature of the environment and, Represents the angle of the ambient wind direction, The pressure of the atmosphere is indicated as being, Representing ambient wind speed; 、、、、、 And All of which represent the fitting coefficients, 、 And Set thresholds respectively representing angle, temperature and speed; taking the oil filling port of the target large-sized conveyor as a circle center and the narrowest working distance as a radius to make a circle, and taking the point which is at the tail edge of the engine nacelle and is closest to the engine body as an origin to make a tangent to the circle, wherein the included angle between the tangent and the symmetrical plane of the engine is the maximum safe included angle; and fifthly, based on the calculation expression established in the step three, acquiring the atmospheric pressure, the ambient temperature, the ambient wind direction angle and the ambient wind speed of the airport where the target large-scale transport is to be implemented regardless of the car refueling, and obtaining the slow car state rapid refueling safety included angle of the target large-scale transport.
2. The method of claim 1, further comprising, Step six, if the quick refueling safety included angle of the slow vehicle state of the target large-sized conveyer obtained in the step five is smaller than the maximum safety included angle, the target large-sized conveyer can refuel in a double-engine slow vehicle state, otherwise, the target large-sized conveyer can refuel in an engine slow vehicle state at one side of a non-refueling port, namely, the single-engine slow vehicle state refuel.
3. The method of claim 1, wherein the airport environmental samples in the first step are obtained by sampling by using a uniform distribution method within a set atmospheric pressure range, an ambient temperature range, an ambient wind direction angle range, and an ambient wind speed range.
4. The method of claim 1, wherein the step two comprises the steps of, Step1, establishing a local flow field grid model and a background flow field grid model which wrap an engine nacelle, and embedding the local flow field grid model into the background flow field grid model; Step 2, adjusting the angle of a background grid model, ensuring that the included angle between the symmetrical plane of the engine and the symmetrical plane of the background flow field grid is the angle of the ambient wind direction in the sample working condition, setting the boundary condition of the background flow field inlet as a speed inlet condition, the speed as the ambient wind speed in the sample working condition, the temperature as the ambient temperature in the sample working condition, the outlet condition of the background flow field as a pressure outlet condition, the pressure value as the atmospheric pressure in the sample working condition and the boundary of the rest background flow field as symmetrical boundary conditions; step 3, setting the outlet boundary and the inlet boundary of the engine as a slow vehicle state total pressure condition and a mass flow condition corresponding to the atmospheric pressure in a sample working condition respectively; step 4, performing steady flow calculation by adopting a SIMPLE algorithm; And 5, making an isothermal line graph of the calculation result in the step 4, taking a point which is the tail edge of the engine nacelle and is closest to the engine body as an origin, and taking a T max ℃ isothermal line in the isothermal line graph as a tangent line, wherein an included angle between the tangent line and a symmetrical plane of the engine is a safe included angle, wherein T max represents the highest temperature which can be born by an operator.
5. The method of claim 4, wherein the local flow field mesh model is embedded in the background flow field mesh model in an overlapping mesh fashion.
6. The method of claim 4, wherein the isotherm plot of the results of the calculation of step 4 is made using CFD-POST.
7. The method of claim 2, further comprising, If the target large-sized conveyer can refuel in the double-engine slow-running state, taking the point which is at the tail edge of the engine nacelle and is closest to the engine body as an endpoint, taking an included angle with the symmetrical plane of the engine as a ray which is positioned between the symmetrical plane of the engine and the refuel opening of the target large-sized conveyer and is used for quickly refuelling the engine in the slow-running state, wherein the ray and the surrounding area of the side of the engine body where the refuel opening is positioned are refuel safety areas; if the target large-scale transporter can refuel in a single slow vehicle state, the side of the body where the refuel port is positioned is a refuel safety area.
8. A large-scale transport vehicle slow-moving rapid oiling system applying the method as in any one of claims 1 to 7, which is characterized by comprising a man-machine interaction module, a fitting module, a safety included angle calculation module and a comparison module; the storage module is used for storing airport environment samples, corresponding flow field temperatures and speeds and working condition included angles; The man-machine interaction module is used for selecting a target large-scale transport machine, inputting the atmospheric pressure, the ambient temperature, the ambient wind direction angle and the ambient wind speed of an airport where the target large-scale transport machine is to be used for implementing the car-free refueling, and responding to the instruction of the comparison module; the fitting module is used for establishing a calculation expression of the slow-vehicle state quick refueling safety included angle of the target large-scale conveyor; The safety included angle calculation module is used for calculating and obtaining a slow-vehicle state quick oiling safety included angle of the target large-scale conveyor; the comparison module is used for comparing the calculation result of the slow car state quick refueling safety included angle of the target large-sized conveyer with the maximum safety included angle of the target large-sized conveyer, if the calculation result of the slow car state quick refueling safety included angle of the target large-sized conveyer is smaller than the maximum safety included angle, a display instruction of 'double slow car state refueling' is sent to the man-machine interaction module, and otherwise, a display instruction of 'single slow car state refueling' is sent to the man-machine interaction module.
9. The system of claim 8, wherein the man-machine interaction module is further configured to mark a fueling safety area on the schematic diagram of the target large-scale transporter according to the display instruction sent by the comparison module and the slow-vehicle state fast fueling safety angle calculated by the safety angle calculation module.

Description

Method and system for determining slow-vehicle state quick oiling of large-scale conveyor Technical Field The invention relates to a method and a system for determining slow-driving quick oiling of a large-scale conveyor, and belongs to the field of conveyor application research. Background Conventional large-scale conveyor refuelling is performed after the engine is shut down, which greatly increases the conveyor ground residence time. If the engine is in a slow vehicle state and simultaneously oiling is implemented, the ground operation efficiency is greatly improved. And the large-scale transport machine usually adopts a wing hanging engine, and the individual large-scale transport machine oil filler is positioned at one side of the tail part of the machine body. Although personnel enter laterally from the fuselage and approach the fuselage from directly below the slow-running engine have proven safe. However, when the operator arrives at the position of the machine body and approaches the tail oil filler along the machine body, the airflow of the tail nozzle of the slow-running engine blows backwards at a certain expansion angle, and although the wake flow does not affect the machine body, the high-speed high-temperature airflow still brings potential safety hazards to the operator approaching the tail oil filler. At the same time, the complex external environment exacerbates the uncertainty of the potential safety hazard. Therefore, the difficulty of the slow-vehicle-state oiling technology of the large-scale conveyor is greatly higher than that of the slow-vehicle-state quick oiling of other machine types. In summary, the core technical difficulty in realizing the slow-loading quick oiling of the large-scale conveyor is how to determine a safety zone capable of bearing temperature and air flow speed in the process that an operator approaches to the tail oiling port along the machine body in a complex external environment. Disclosure of Invention The invention aims to solve the technical problem of providing a method and a system for determining the slow vehicle state quick refueling of a large-scale conveyor, which are used for quickly determining a slow vehicle state quick refueling mode and a safe area under the condition of fully considering the influence of external environment for the first time. The invention adopts the following technical scheme for solving the technical problems: A method for determining slow-vehicle rapid fueling of a large-scale conveyor, the method comprising the steps of: step one, establishing an airport environment database for filling the vehicle without regard to implementation, wherein the database comprises a plurality of groups of airport environment samples, and each group of airport environment samples comprises atmospheric pressure, environment temperature, environment wind direction angle and environment wind speed; Taking each group of airport environmental samples in the first step as sample working conditions, taking the engine closest to the oil filling port as a calculation object, calculating the temperature and the speed of a flow field under each sample working condition, and recording a corresponding safety included angle; fitting the safety included angle recorded in the second step, and establishing a calculation expression of the quick oiling safety included angle of the slow-running state of the large-scale conveyor: where null indicates that there is no safe working area, Indicating the temperature of the environment and,Represents the angle of the ambient wind direction,The pressure of the atmosphere is indicated as being,Representing ambient wind speed;、、、、、 And All of which represent the fitting coefficients,、AndSet thresholds respectively representing angle, temperature and speed; Taking the oil filling port of the target large-sized conveyor as a circle center and the narrowest working distance as a radius to make a circle, and taking the point which is at the tail edge of the engine nacelle and is closest to the engine body as an origin to make a tangent to the circle, wherein the included angle between the tangent and the symmetrical plane of the engine is the maximum safe included angle; and fifthly, based on the calculation expression established in the step three, acquiring the atmospheric pressure, the ambient temperature, the ambient wind direction angle and the ambient wind speed of the airport where the target large-scale transport is to be implemented regardless of the car refueling, and obtaining the slow car state rapid refueling safety included angle of the target large-scale transport. As a further optimization of the invention, the method further comprises, Step six, if the quick refueling safety included angle of the slow vehicle state of the target large-sized conveyer obtained in the step five is smaller than the maximum safety included angle, the target large-sized conveyer can refuel in a double-engine slow vehicle state, o