Research On The Strength Test Node And Transmission Algorithm Of Aircraft Fuselage Based On ZigBee Technology

Aircraft's body, especially the wing fuselage section will encounter very complex stress situation during the flight. When the aircraft was flying at high speed, lift and gravity is to give the body a lot of pressure, resulting in overload. To be able to withstand high overload capacity, ensure stable flight, we need aircraft fuselage with a very good strength. Therefore, under all kinds of circumstances in the aircraft fuselage, especially deformation and strength characteristics of the test under extreme conditions, aircraft flight and styling work important content.The current aircraft strength test scenarios are divided into two types, one is testing class test to use laser, ultrasonic nondestructive testing and other means-based; and in the wind tunnel, static, impact test, which require dynamic, large-area the case of data, usually using a piezoelectric element(strain gauge, etc.) together with the signal line, the bridge circuit, operational amplifier, wired measurement program ADC chip, a microprocessor chip configuration. The main disadvantage of such programs is that the system of strain gauges and other sensors are connected by a signal line, so the whole line test system is very complicated, which makes installation and removal of the system becomes very difficult, to a certain extent, affected the aircraft speed and efficiency strength test work.Zig Bee is a more popular recently, and relatively mature networking solutions. It has a low power consumption, large network capacity, communication confidentiality, channel more support many types of topological series of advantages, is very suitable for use in large, very large test network. This provides a foundation for the aircraft fuselage communications technology strength testing system wireless network.The main work of this paper is the innovative Zig Bee wireless sensor network applications in the aircraft fuselage strength testing in this area, and has developed a full-featured intelligent test End_Device.In order to improve test accuracy, we have optimized in terms of ADC chip selection test circuit debugging, the physical structure of the measuring unit; and in order to make the measurement system when you upgrade to VLSI node still feasible(there may be practical 10K level The measurement node), we do a lot more design and simulation work in Zig Bee network topology design, communication optimization algorithm, designed the "tree network broadcast time on the" program and the "tree network + subnet daisy chain" two signals transmission or network topology scenarios; in the test, using the plastic plate simulates the aircraft fuselage, and the installation and testing of the deformation nodes actual test; node actually used in order to overcome an insufficient number of difficulties, the use of software emulation of our network topology and the actual production of a number of nodes, network communications test carried out; communication, the use Packet_Sniffer capture software for testing wireless nodes capture data were analyzed for program design were compared and corrected to ensure that our small-scale experiments normal Zig Bee test network for communicating, testing the feasibility of the scheme.Ultimately, our software simulation(NS2-based software under Linux), the actual test(to modify the software protocol is based on Z-Stack protocol stack), communications capture test results have been more in line with expectations, and proved the feasibility of the program, wireless sensor network airframe strength test work has made its own exploration.