Vaughn College of Aeronautics and Technology

About: Vaughn College of Aeronautics and Technology is a education organization based out in New York, New York, United States. It is known for research contribution in the topics: Gravitational microlensing & Planetary system. The organization has 727 authors who have published 708 publications receiving 14082 citations. The organization is also known as: College of Aeronautics.

Chapter 8 – statistical methods

Abstract: Publisher Summary This chapter discusses the statistical methods of all measurement techniques. Probability is concerned with the measured outcomes of experiments that are individually unpredictable. The general shape of a probability density diagram indicates a feature known as the probability distribution of which there is an infinite variety. However, certain types of probability distribution arise from theoretical concepts, and many practical situations in nature can be regarded as approximating to one or other of these special distributions. A basic form is the binomial distribution that is associated with events having only a binary or go-no-go outcome. Auto-correlation analysis is seen to describe the variability of a function. However, when an experiment results in the production of an irregular waveform it is not unreasonable to try to break it down in terms of a Fourier series. If the waveform is truly random noise it is essentially aperiodic, and no fundamental frequency can be present.

Disturbance observer design for nonaffine nonlinear systems with possibly unbounded or non-differentiable conditions

Abstract: A novel adaptive disturbance observer design method is presented for a class of nonaffine nonlinear systems in the presence of disturbances possibly being unbounded or non-differentiable. Sliding mode differentiator is constructively introduced to estimate the compound disturbance without any prior knowledge. The general assumption needed for the traditional method dealt with the nonaffine functions is relaxed and meanwhile, the restrictive assumption is removed so that the compound disturbance is no longer necessarily to be bounded or differentiable. The tracking error can be render to arbitrarily small through stability proof and meanwhile, the tracking performance can be guaranteed. Finally, simulation result is given to demonstrate the effectiveness of designed approach.

Some effects of sweep direction and strakes for wings with sharp leading edges

Abstract: An experimental investigation has been carried out to compare the effects of sweep direction upon the aerodynamic characteristics of three wing planforms. The wings have biconvex aerofoil sections which allow them to be tested in both the forward-swept and backward-swept configurations without changing the section profile. Measurements of lift, drag and pitching moment have been made for angles of incidence in the range —5° to +50° at a mean chord Reynolds number of approximately 1·5 × 10 5 and a Mach number of 0·1. To complement the force and moment data a comprehensive series of oil-flow visualisations are also presented. In addition the aerodynamic characteristics of simple strakes (wing root fillets) have been studied for both the swept-forward and swept-back configurations.

A New Robust Control Method for Switched Reluctance Motor

Abstract: A new robust control method for switched reluctance motor is presented in this paper. Since the high uncertainty and non-linearity of the SRM model, an adaptive synergetic control method is introduced to guarantee the robustness and reduce the chattering of the control system, fuzzy logic is applied to estimate the model to simplifies the design of the controller. In this study, the basic principle and the control law is analyzed, the controller is designed and the system response is proposed. Simulation and experimental results verify the good starting performance and strong robustness and adaptability to external load disturbance and given speed change of the SRM system under the proposed control method.