Abstract:Atmospheric turbulence motion has a significant impact on the radio waves in time and space. Described refractive index structure constant turbulence is the most important method. Through the establishment of refractive index structure parameter model is to study the effects of atmospheric turbulence on the wireless communication of highspeed rail. Through the use of wind engineering and the basic principles of aerodynamics and the introduction of the train winds is to deduce one refractive index structure constant model in highspeed rail. The main parameters of the model inputs are trains wind, temperature and humidity. Through theoretical analysis and experimental results verify the train winds refractive index structure constant are mainly train the boundary layer thickness, the distance from the side wall of the train, train and train vehicle height. By analyzing model we can know, speed, temperature and humidity have greater impact. in fact,the next of impact is the thickness of the boundary layer of the train, the distance from the side wall of the train and the train height. And for studying the propagation of radio waves at high speed railway we provides a theoretical reference.

Abstract:In order to achieve the intelligent infrared control of common household appliances, we choose to use smartphone instead of traditional infrared remote control. we use the Internet resources to design system, and select Baidu Cloud Development Platform to deploy the project and install the database; Infrared terminal controller is designed to use four 90 degrees infrared lightemitting diodes with a wavelength of 940 nm,plus 2.4 GHz PCB antenna, and set TLN13UA06 outside of the microcontroller development platform to achieve converting between WiFi and serial; CC3200 offers WiFi, using 802.11n protocol stack to achieve WiFi communication with the maximum transmission rate of 600mbps; Eclipse development platform is using to develop mobile control terminal APP interface, and Web Service calls for cloud data with request method. We test it on an air conditioner with many times, and find out the system design is stable, and the experimental results are consistent with the preset function.

Abstract:According to that indicator should move to target location precisely and smoothly, a drive control system is put forward based on vehicle stepper motor 6405 R475. Substep driving principle and microstep driving principle of the vehicle stepper motor are introduced, and a microstep driving model is designed. And then no return to zero of the vehicle stepper motor impact on the followup control is analyzed, and the process of return zero has carried on the design. Finally, the parabolic S curve mathematical model is analyzed, and the algorithm plan based on the parabolic S curve is built for the vehicle stepper motor’s acceleration and deceleration control. Experimental results show that this system of control can meet need for design.

Abstract:The automobile comprehensive braking performance test system based on the existing antiforce rolling brake testing platform, increased the measuring device of brake pedal force, brake pipe pressure, the designed software system had the ability of multichannel data measuring, collecting and processing, measuring the actual ground brake force when simulate the moving vehicle. The system can boost the pressure of brake pipe by hand loading mode to the test vehicle brake pedal, synchronous measure the test vehicle brake pedal force, brake pipe pressure and the variation of the wheel brake force, when brake respond, brake force rise, continuously brake and brake relax, and then apply research achievement to accident vehicle braking performance forensic work that the brake pipe damaged but four wheels and brakes were in good condition.