Engineering topics
Publications and source records attributed to Nayadley, J. R., Sr..
Braking system, which employs angular accelerometer to control wheel braking and results in low level of tire slip, has been developed and tested. Tests indicate that system is feasible for operations on surfaces of different slipperinesses. System restricts tire slip and is capable of adapting to rapidly-changing surface conditions.
An investigation was made to determine the feasibility of an automatic braking system for arresting the motion of an airplane by sensing and controlling braked wheel decelerations. The system was tested on a rotating drum dynamometer by using an automotive tire, wheel, and disk-brake assembly under conditions which included two tire loadings, wet and dry surfaces, and a range of ground speeds up to 70 knots. The controlling parameters were the rates at which brake pressure was applied and released and the Command Deceleration Level which governed the wheel deceleration by controlling the brake operation. Limited tests were also made with the automatic braking system installed on a ground vehicle in an effort to provide a more realistic proof of its feasibility. The results of this investigation indicate that a braking system which utilizes wheel decelerations as the control variable to restrict tire slip is feasible and capable of adapting to rapidly changing surface conditions.
An experimental investigation of the use of a high frequency spark to promote early boundary layer transition on a wind tunnel model was conducted at a Mach number of 8.5. Test variables included four electrode configurations, a frequency range from 10 kHz to 50 kHz, and various power inputs to the spark. The general conclusion obtained from this investigation is that over the parameter range, the high frequency spark is ineffective in inducing early transition at the test Mach number.