Ground full-life-cycle stealth performance maintaining system for stealth aircraft

Abstract

The invention discloses a ground full-life-cycle stealth performance maintaining system for a stealth aircraft, which relates to the technical field of aircraft coating detection and repair and comprises an inflatable storehouse, a complete machine test defect detection device, a coating repair cabin, a coating performance evaluation system and a maintenance environment control system. The inflatable storehouse provides a closed space for the invisible airplane after being inflated and built; the complete machine test defect detection device is used for detecting whether the coating has defects or not; the coating performance evaluation system judges whether the collected coating defects can influence the stealth performance of the airplane or not and the influence degree; the coating repairing cabin is used for repairing coating defects existing in an airplane, and the maintenance environment control system ensures constant temperature, constant humidity and ventilation circulation in the whole maintenance process. The invention provides a constant-temperature and constant-humidity ventilation space required by ground parking, detection and maintenance of an invisible aircraft; and detection, maintenance and evaluation of the aircraft stealth coating are completed in an airport and other base level environments.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft coating detection and repair, and in particular to a stealth performance maintenance system for a stealth aircraft during its entire life cycle on the ground. Background Art

[0002] The integrity of the aircraft's stealth coating directly affects its stealth performance and combat performance. With the gradual application of advanced stealth aircraft, the maintenance and guarantee of stealth aircraft during use is still lacking. How to maintain stealth performance during the life cycle of the aircraft is of great significance. When the aircraft returns to the ground after completing its mission and is parked on the ground, the stealth coating is easily affected by the environment and may be damaged or corroded. When defects occur in the stealth coating, it is difficult for maintenance personnel to judge the changes in stealth performance and whether maintenance is needed.

[0003] At present, stealth coating repair requires returning to the factory for repair, which cannot be performed in an airport environment. As a result, the aircraft has high stealth performance when it leaves the factory, but the stealth performance continues to decline during use, forcing it to be returned to the factory for repair, while the performance of other parts of the fuselage remains good, consuming a lot of manpower and material resources. The existing hangar can only meet the needs of ground parking of aircraft and cannot provide a maintenance environment and conditions. At the same time, the existing method of observing stealth coating defects is mostly visual inspection, which cannot determine whether repair is needed or the defects do not affect performance; and most of the existing stealth coating repair measures are located in overhaul plants, which require the stealth aircraft to be returned to the factory for repair and cannot be applied at the airport. Summary of the invention

[0004] The purpose of the present invention is to provide a stealth performance maintenance system for a stealth aircraft throughout its entire life cycle on the ground, to provide a constant temperature and humidity ventilated space required for the ground parking, inspection and maintenance of the stealth aircraft; and to complete the inspection, maintenance and evaluation of the aircraft stealth coating in a grassroots environment such as an airport.

[0005] In order to solve the above technical problems, the present invention provides a stealth aircraft ground full life cycle stealth performance maintenance system, comprising:

[0006] Inflatable warehouse, whole machine test defect detection device, coating repair cabin, coating performance evaluation system and maintenance environment control system;

[0007] The inflatable warehouse provides a closed space for the stealth aircraft after being inflated and constructed;

[0008] The whole machine test defect detection device is installed in the inflatable warehouse and is used to detect whether there are defects in the coating;

[0009] The coating performance evaluation system determines whether the collected coating defects will affect the aircraft's stealth performance and the extent of the impact;

[0010] The coating repair cabin repairs coating defects on aircraft, and the maintenance environment control system ensures constant temperature, humidity and ventilation circulation throughout the entire maintenance process.

[0011] Furthermore, the inflatable warehouse adopts a non-metallic design to provide a fully wave-transparent low background noise test environment. The inflatable warehouse adopts a high-strength weather-resistant airtight composite membrane material, including a central base material and an airtight layer and a weather-resistant layer sequentially arranged on the outside of the base material.

[0012] Further, the whole machine test defect detection device is composed of a multi-physics field defect detection system and a mobile scanning system;

[0013] The multi-physics field detection system is installed on the mobile scanning system and detects tiny defects in the aircraft surface coating through multi-physics fields such as optics, infrared, radar, and sound waves;

[0014] The mobile scanning system includes track gas columns, supporting gas columns, carbon fiber connecting trusses, mobile tracks and lifting systems;

[0015] The mobile scanning system uses an inflatable structure as the load-bearing structure, and is equipped with a carbon fiber truss to provide support for the mobile track. It can achieve pitch adjustment within a 30° pitch angle. The mobile scanning system is also equipped with a lifting system and supporting gas columns.

[0016] Furthermore, the coating repair cabin includes coating removal equipment, substrate grinding equipment, coating preparation equipment, coating spraying equipment, a ventilation system and a main control box.

[0017] Furthermore, the coating performance evaluation system is developed based on the NET platform for measurement control and data processing software, adopts a multi-layer structure, and separates the interface from the implementation, and includes the following processes:

[0018] S1. Calculation and evaluation of stealth performance such as RCS and infrared radiation intensity based on aircraft defects;

[0019] S2. Accurately and quickly calculate electromagnetic scattering of various types of targets such as aircraft and ground targets;

[0020] S3. Battlefield situation simulation and deduction: according to actual combat conditions and scenarios, construct offensive and defensive targets and scenarios, and study the penetration process.

[0021] Furthermore, the maintenance environment control system includes a main control box, an environmental control air inlet, a non-combustible airtight fiber air duct, an environmental control exhaust, and a temperature and humidity sensor. The main control box, the environmental control air inlet, and the environmental control exhaust are integrated in a comprehensive environmental control cabin, located in the middle of both sides of the inflatable warehouse.

[0022] Furthermore, the environmental control air inlet end is composed of a salt spray purification section, a temperature and humidity control section, a fan section and an explosion-proof section.

[0023] Compared with the prior art, the beneficial effects of the present invention are to realize coating detection and repair of stealth aircraft at the grass-roots level, to maintain the stealth performance throughout the life cycle of the aircraft, to ensure that the stealth performance of the aircraft is maintained within a certain range during overhaul, to ensure that the aircraft has good stealth performance during emergency combat missions, to avoid frequent returns to the factory, and to save manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the material structure of the inflatable hangar in the present invention;

[0026] Figure 3 is a schematic diagram of a mobile scanning system in the present invention;

[0027] Figure 4 is a schematic diagram of a coating repair cabin;

[0028] Figure 5 It is a diagram of the coating performance evaluation system in the present invention;

[0029] Figure 6 This is a schematic diagram of the maintenance environment control system of the present invention;

[0030] Figure 7 It is a system diagram of the air inlet end of the environmental control in the present invention;

[0031] Figure 8 It is a system diagram of the temperature and humidity control section in the present invention;

[0032] Fig. 9 It is a system diagram of the environmental control exhaust end in the present invention;

[0033] Fig.10 This is a schematic diagram of the recovery device in the exhaust end of the environmental control;

[0034] Fig.11 It is a schematic diagram of the structure of the non-combustible airtight fiber air duct in the present invention.

[0035] In the figure: 1. Inflatable warehouse; 2. Whole machine test defect detection device; 3. Coating repair cabin; 4. Coating performance evaluation system; 5. Maintenance environment control system. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] refer to Figure 1 , a stealth performance maintenance system for stealth aircraft throughout its life cycle on the ground, comprising:

[0038] Inflatable warehouse 1, whole machine test defect detection device 2, coating repair cabin 3, coating performance evaluation system 4 and maintenance environment control system 5;

[0039] The inflatable warehouse 1 provides a closed space for the stealth aircraft after being inflated. The inflatable warehouse 1 adopts a non-metallic design to provide a fully transparent low background noise test environment. Figure 2 The inflatable warehouse 1 adopts high-strength weather-resistant airtight composite membrane material, including a central base material and an airtight layer and a weather-resistant layer sequentially arranged on the outside of the base material. The inflatable warehouse 1 is used to mount the test system, with an internal width of ≥30m, a length of ≥23m, and a height of ≥9m. It provides test conditions with a circumferential angle of not less than 40° and a pitch angle of 30°. The hangar adopts a non-metallic design to provide a fully transparent and low background noise test environment.

[0040] The whole machine test defect detection device 2 is installed in the inflatable warehouse 1 and is used to detect whether there are defects in the coating.

[0041] The whole machine test defect detection device 2 is composed of a multi-physics field defect detection system and a mobile scanning system;

[0042] The multi-physics field detection system is installed on the mobile scanning system. It detects tiny defects in the aircraft surface coating through optical, infrared, radar, sound waves and other multi-physics fields. The multi-physics field comprehensive test can quickly identify defects such as blistering, cracks, scratches, peeling and other defects on the coating surface, and quickly mark the defective parts. The single position detection time does not exceed 2 minutes;

[0043] refer to Figure 3 The mobile scanning system includes a track air column, a supporting air column, a carbon fiber connecting truss, a mobile track and a lifting system. The mobile scanning system uses an inflatable structure as a load-bearing structure and a carbon fiber truss to provide support for the mobile track. It can achieve pitch adjustment within a 30° pitch angle. The lifting system and supporting air columns ensure that the test operation is reliable and stable.

[0044] a) Track air column

[0045] The track air column is a circular air column centered on the aircraft to be tested. The arc radius is not less than 30m, which meets the test space requirements. It includes a 1m diameter air column and a 1.5m diameter air column. The 1.5m diameter air column is mainly used to increase the structural rigidity of the track air column to ensure structural stability during testing. The 1m diameter air column is used to install the carbon fiber truss to provide track support for the operation of the test system.

[0046] b) Support gas column

[0047] The supporting air columns use multiple independent vertical air columns to support the track air columns. After the track air columns are lifted, the supporting air columns are inflated to form and support the track air columns to improve the structural stability.

[0048] The track air column adopts a modular design. Each air column contains multiple modules. The number of inflation modules varies according to the lifting pitch height. Different modules can be inflated according to the test pitch angles of 5°, 10°, 15°, 20°, 25°, and 30°.

[0049] c) Carbon fiber connecting trusses

[0050] The carbon fiber connecting truss is installed on the 1m diameter track air column to provide a stable mounting platform for the mobile track.

[0051] d) Moving track

[0052] The mobile track uses high-precision brushed aluminum alloy as the base. The servo motor drives the ball screw to achieve the translation of the slide on the guide rail. The peak straightness is better than 167μm and the maximum speed is not less than 50mm / s. It is also equipped with a protective cover to prevent dust and sand.

[0053] The moving track keeps moving smoothly during the whole scanning process, so the eccentric load design and verification of the linear module are carried out under the condition of ignoring the influence of dynamic load. The scanning rail is mounted horizontally, and then the slide and antenna move left and right during the scanning process to form eccentric load, and finally the track will also deform under the action of its own gravity. Based on the above analysis, it can be seen that when the antenna moves to the left and right extreme positions, it is in the extreme stress state. This design adopts the HK210 model wide aluminum alloy base (7075T6). Due to its special-shaped cross-section shape, the finite element method is used for simulation analysis.

[0054] The lifting system consists of a winch, a rotating mechanism, a sling, a lifting ring and other components. The lifting system is fixed to the inflatable hangar through the lifting ring. The winch tightens the sling to lift the track air column at a preset pitch angle. The rotating mechanism is used to adjust the lifting and lowering direction of the sling to make lifting more convenient.

[0055] refer to Figure 4 The coating repair cabin 3 repairs the coating defects on the aircraft. The maintenance environment control system 5 ensures constant temperature, humidity and ventilation circulation throughout the maintenance process. The coating repair cabin 3 is based on the maintenance process and reasonable layout design, and the maintenance tools and materials are reasonably laid out to achieve convenient and rapid maintenance of the stealth coating. The coating repair cabin 3 includes coating removal equipment, substrate grinding equipment, coating preparation equipment, coating spraying equipment, ventilation system and main control box, etc. Rapidly repair the coating with a damaged area not exceeding 0.1 square meters.

[0056] refer to Figure 5 The coating performance evaluation system 4 determines whether the collected coating defects will affect the stealth performance of the aircraft and the degree of the impact. The coating performance evaluation system 4 is based on the .NET platform for measurement control and data processing software development, adopts a multi-layer structure, and a design concept of separation of interfaces and implementations. The software has high horizontal and vertical expansion capabilities.

[0057] Information extraction and fault diagnosis, accurately identify fault characteristics using deep learning-based intelligent diagnosis technology, match fault type, area and location, shorten troubleshooting time, improve diagnosis efficiency, build a performance repair technology solution system under different support systems and mission states, have the ability to quickly detect, diagnose and evaluate and repair stealth performance, and support stealth performance on-site rapid recovery solutions.

[0058] Specifically:

[0059] S1. Calculation and evaluation of stealth performance such as RCS and infrared radiation intensity based on aircraft defects;

[0060] S2, accurately and quickly calculate electromagnetic scattering of various types of targets such as aircraft and ground targets;

[0061] S3. Battlefield situation simulation and deduction: according to actual combat conditions and scenarios, construct offensive and defensive targets and scenarios, and study the penetration process.

[0062] refer to Figure 6 and Figure 7 The maintenance environment control system 5 includes a main control box, an environmental control air inlet end, a non-combustible airtight fiber air duct, an environmental control exhaust end, and a temperature and humidity sensor. The main control box, the environmental control air inlet end, and the environmental control exhaust end are integrated in the comprehensive environmental control cabin, which is located in the middle of both sides of the inflatable warehouse 1.

[0063] The environmental control air inlet end is composed of a salt spray purification section, a temperature and humidity control section, a fan section and an explosion-proof section.

[0064] a) Environmental control air intake end

[0065] The salt spray purification section mainly uses anti-salt filters to remove salt from the hangar air intake, ensuring that the air intake inside the hangar is clean air without salt spray. The diameter of the salt spray is mostly less than 5μm, and the number of particles with a diameter of 1 to 5μm accounts for more than 90% of the total. Figure 7 , the salt mist removal filter element can achieve discrete separation of salt particles, and a tightly folded filter is designed for optimized filtration, with an efficiency level of EN779 or higher. The anti-salt filter can remove 90% of salt mist particles with a particle size of more than 1μm, achieving a good salt mist removal effect.

[0066] refer to Figure 8The temperature and humidity control section mainly includes temperature control equipment and dehumidification equipment, which control the temperature and dehumidify the air at the air intake end to ensure that the air entering the hangar is dry air at a preset temperature. Wet air contains a lot of moisture. When it passes through the evaporator of the refrigeration system, a large amount of moisture in the air condenses and dehumidifies on the fin surface of the evaporator because the surface temperature of the evaporator is lower than the dew point temperature of the wet air. The low-temperature dry air flows through the condenser of the refrigeration system. The surface temperature of the condenser is relatively high. After being heated by the condenser at a high temperature, it forms dry air at a preset temperature.

[0067] The fan section uses an axial flow blower to blow salt-free, low-humidity, temperature-controlled air into the hangar. The explosion-proof section connects the environmental control air intake end and the non-flammable airtight fiber air duct, and uses explosion-proof dust removal fiber cloth to prevent dust and other gases generated by maintenance operations inside the hangar from entering the environmental control air intake end and causing explosion accidents.

[0068] b) Environmental control exhaust end

[0069] refer to Fig. 9 The environmental control exhaust end is composed of an explosion-proof section, an air purification section, and a fan section. The explosion-proof section connects the environmental control air intake end and the non-flammable airtight fiber duct to prevent dust and other gases generated by maintenance operations inside the hangar from entering the environmental control exhaust end and causing explosion accidents. The air purification section is located after the explosion-proof section, and purifies the exhaust to eliminate possible waste gas and prevent environmental pollution. The fan section uses an axial flow suction fan, which is the power section for exhaust inside the hangar.

[0070] The explosion-proof section uses explosion-proof fiber cloth for dust removal and adopts weight control design. After the weight of the explosion-proof fiber cloth reaches the set value, high-pressure dust removal is carried out. The small high-pressure fan installed above the explosion-proof fiber cloth is started, and the particles accumulated on the fiber cloth are blown down to the recovery device below with high-pressure wind to ensure the long-term use of the explosion-proof section. The recovery device can refer to Fig.10 .

[0071] c) Non-combustible airtight fiber duct

[0072] The non-combustible airtight fiber duct includes an air inlet duct and an air outlet duct. It is based on a non-combustible permeable fabric surface, and holes are punched on the non-combustible grade permeable fabric surface to obtain effective air supply from a longer distance and sufficient mixing of air in a larger area. The air inlet duct is installed on the top of the hangar and consists of three non-combustible airtight fiber ducts with a diameter of 2000mm. Its main function is to supply air from the top. The air outlet duct is installed on both sides of the bottom of the hangar. Through the continuous exhaust of the fan at the environmental control exhaust end, the gas and dust inside the hangar are continuously discharged to achieve air circulation.

[0073] refer to Fig.11The non-combustible airtight fiber duct is based on non-combustible permeable fabric, has a B1 fire rating, and is lightweight, making it suitable for use in mobile inflatable hangars. The non-combustible airtight fiber duct uses holes in the fabric to distribute air evenly, without a sense of wind, and the airflow generated is laminar airflow.

[0074] d) Analysis of air inlet and outlet volume

[0075] The internal clear span of the inflatable hangar is greater than 30m, the longitudinal length is greater than 40m, and the height is greater than 11m; the external height is less than 16m, and the internal space is greater than 8400m 3 According to the relevant provisions of GB50019-2003:

[0076] The factory should be equipped with a compensating exhaust system, maintain indoor downward pressure or ensure that each person is no less than 30m 3 The maximum value of fresh air volume / h is determined frequently;

[0077] For public buildings with larger spaces and tall factories with room temperature fluctuation range greater than or equal to ±0.1℃, nozzles or swirl vents can be used for air supply;

[0078] When the room height is greater than 6m, the circulating air volume can be designed as 6m3 / h·m2. The wind speed should not be greater than 0.5m / s.

[0079] According to the hangar size, the total volume is > 8400m 3 , determine the circulating air volume setting value is 8400m 3 / h, the fresh air volume generally accounts for about 10% of the circulating air volume, and the final fresh air volume is set at 840m 3 / h. The adsorption component of the dehumidifier needs ventilation regeneration, and the air volume is calculated as one-third of the fresh air volume, so the regeneration air volume is 280m 3 / h.

Claims

1. A stealth performance maintenance system for a stealth aircraft during its entire life cycle on the ground, characterized in that: Include: Inflatable warehouse (1), whole machine test defect detection device (2), coating repair cabin (3), coating performance evaluation system (4) and maintenance environment control system (5); The inflatable warehouse (1) provides a closed space for the stealth aircraft after being inflated and constructed; The whole machine test defect detection device (2) is installed in the inflatable warehouse (1) and is used to detect whether there are defects in the coating; The coating performance evaluation system (4) determines whether the collected coating defects will affect the stealth performance of the aircraft and the degree of the impact; The coating repair cabin (3) is used to repair coating defects on the aircraft, and the maintenance environment control system (5) ensures constant temperature, humidity and ventilation circulation throughout the entire maintenance process.

2. A stealth aircraft ground-based full life cycle stealth performance maintenance system as claimed in claim 1, characterized in that: The inflatable storehouse (1) adopts a non-metallic design to provide a fully wave-transparent low background noise test environment. The inflatable storehouse (1) adopts a high-strength weather-resistant airtight composite membrane material, including a central base material and an airtight layer and a weather-resistant layer sequentially arranged on the outside of the base material.

3. A stealth aircraft ground full life cycle stealth performance maintenance system as claimed in claim 2, characterized in that: The whole machine test defect detection device (2) is composed of a multi-physical field defect detection system and a mobile scanning system; The multi-physics field detection system is installed on the mobile scanning system and detects tiny defects in the aircraft surface coating through multi-physics fields such as optics, infrared, radar, and sound waves; The mobile scanning system includes track gas columns, supporting gas columns, carbon fiber connecting trusses, mobile tracks and lifting systems; The mobile scanning system uses an inflatable structure as the load-bearing structure, and is equipped with a carbon fiber truss to provide support for the mobile track. It can achieve pitch adjustment within a 30° pitch angle. The mobile scanning system is also equipped with a lifting system and supporting gas columns.

4. A stealth aircraft ground-based full life cycle stealth performance maintenance system as claimed in claim 3, characterized in that: The coating repair cabin (3) comprises coating removal equipment, substrate grinding equipment, coating preparation equipment, coating spraying equipment, a ventilation system and a main control box.

5. A stealth aircraft ground-based full life cycle stealth performance maintenance system as claimed in claim 4, characterized in that: The coating performance evaluation system (4) is developed based on the NET platform for measurement control and data processing software, adopts a multi-layer structure, and separates the interface from the implementation, and includes the following processes: S1. Calculation and evaluation of stealth performance such as RCS and infrared radiation intensity based on aircraft defects; S2. Accurately and quickly calculate electromagnetic scattering of various types of targets such as aircraft and ground targets; S3. Battlefield situation simulation and deduction: according to actual combat conditions and scenarios, construct offensive and defensive targets and scenarios, and study the penetration process.

6. A stealth aircraft ground-based full life cycle stealth performance maintenance system as claimed in claim 5, characterized in that: The maintenance environment control system (5) comprises a main control box, an environmental control air inlet, a non-combustible airtight fiber air duct, an environmental control exhaust, and a temperature and humidity sensor. The main control box, the environmental control air inlet, and the environmental control exhaust are integrated in a comprehensive environmental control cabin, and are located in the middle of both sides of the inflatable warehouse (1).

7. A stealth aircraft ground-based full life cycle stealth performance maintenance system as claimed in claim 6, characterized in that: The environmental control air inlet end is composed of a salt spray purification section, a temperature and humidity control section, a fan section and an explosion-proof section.

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