The following is a comprehensive description of the maintenance details for the navigation expansion module, combined with its mobile operation characteristics and complex working conditions, proposing a systematic maintenance plan from multiple dimensions:
1、 Basic cleaning and protection
Cleaning of shell and heat dissipation port
After daily homework, it is necessary to use a soft bristled brush to remove dust from the surface of the equipment, with a focus on cleaning the heat dissipation pores to prevent dust accumulation from blocking the heat dissipation efficiency. If encountering mud or corrosive substances adhering, neutral cleaning agents can be used to wipe, and strong acidic and alkaline solvents are prohibited.
For modules that have been operated in water environments, it is necessary to disassemble removable and washable components (such as filters), air dry them, and then reassemble them to avoid residual moisture causing circuit short circuits.
Interface and connector protection
All data cables and power interfaces must be coated with silicone grease to prevent moisture and equipped with dust caps. It is recommended to check the oxidation status of the pins of frequently inserted and unplugged aviation plugs every month. Mild oxidation can be wiped lightly with an isopropanol cotton swab.
The bending radius of cable should be ≥ 8 times the wire diameter to avoid excessive twisting and internal breakage. The exposed part should be wrapped in a dedicated storage tray and stored away from sharp objects.
2、 Special maintenance of electrical system
Power supply unit management
The lithium battery pack undergoes a deep charge discharge cycle once a month (fully charged after low voltage alarm) to prevent capacity degradation caused by memory effects. Before long-term idle, the battery should be maintained at 50% -60% and stored in a cool and dry place.
The surface of the solar charging panel should be cleaned of bird droppings and oil stains every week. If there are more than 3 scratches on the glass cover, it needs to be replaced to ensure the photoelectric conversion efficiency.
Circuit status monitoring
The power on self-test program runs daily, with a focus on voltage fluctuation alarms (normal within ± 15% threshold). If there is intermittent power outage, it is necessary to check for poor contact of the fuse holder or virtual soldering points in the circuit.
The surge protection module is tested quarterly for its on-off function, simulating lightning strikes to verify whether its response speed meets the design standards.
3、 Mechanical structure stability guarantee
Inspection of fastening components
Screws and buckles working in a vibrating environment need to be checked for torque every week (according to the values indicated in the manual), with a focus on inspecting the load-bearing parts such as bracket connections and sensor mounting brackets. Replace the stainless steel material with a substitute immediately upon discovering the sliding wire.
Inject low-temperature grease into sliding rails, hinges, and other movable joints every month to avoid sticking caused by metal fatigue.
Efficiency evaluation of shock absorber device
Check the degree of cracking of rubber shock absorbers every six months, and replace them when the compression deformation exceeds 10%. Hydraulic dampers are tested for piston rod sealing every year, and any oil leakage exceeding 5 drops per minute is considered a failure.
4、 Calibration of sensors and functional modules
Interdisciplinary parameter joint debugging
The GPS positioning module undergoes dual-mode static/dynamic calibration every month, with a differential signal error of less than 0.5m. The calibration of the six degree of freedom attitude angle of the inertial navigation unit (IMU) needs to be completed in two states: horizontal plane and 45 ° tilt.
The temperature and humidity sensor is calibrated using the standard salt spray box comparison method. When the error exceeds ± 2% RH or ± 0.5 ℃, the compensation algorithm is activated for correction.
Data collection link verification
The full-scale input test of the AD acquisition card should be performed monthly, and the nonlinearity should be less than 0.1% FS. The CAN bus communication error rate test should last for 48 hours without packet loss, and the baud rate matching degree should reach 100%.
5、 Special environmental response strategies
High humidity/salt spray protection
The PCB board is sprayed with three proof paint (IPC-CC-830B standard), and the connectors are replaced with gold finger contacts. Place a color changing silicone indicator inside the cabin and replace it promptly after saturation with moisture.
After working in coastal areas, rinse the shell with clean water and blow dry it, with a focus on treating salt crystal deposition in the gaps.
Adaptability to drastic temperature changes
Simulate rapid temperature changes from -40 ℃ to+70 ℃ in a cold and hot shock test chamber to verify the display delay of the LCD screen and the read/write stability of the hard disk. The optical window is made of quartz glass to avoid stress cracks caused by thermal expansion and contraction.