Accession Number:

AD0701735

Title:

A NON-GAUSSIAN TURBULENCE SIMULATION

Descriptive Note:

Final technical rept. Oct 1967-May 1969

Corporate Author:

WASHINGTON UNIV SEATTLE DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s):

• Reeves, Paul M.

Report Date:

1969-11-01

Pagination or Media Count:

76.0

Abstract:

A comparison of the statistical properties of low altitude atmospheric turbulence and the characteristics of presently used simulation techniques shows that these techniques do not satisfactorily account for the non-Gaussian nature of turbulence. A non-Gaussian turbulence simulation, intended to be used in conjunction with piloted flight simulators, is developed. The simulation produces three simultaneous random processes which represent the three orthogonal gust components. The probability distribution of each component is characterized by a modified Bessel function. The rms intensity and scale length of each component are independent parameters. A general method of introducing cross spectra between components is demonstrated. The multiplication of independent random processes is used to generate each of the gust components. Gaussian white noise generators, analog multipliers, and linear filters are used throughout the simulation. A complete analog circuit diagram is presented.

Descriptors:

• *ATMOSPHERIC MOTION
• *VERTICAL TAKEOFF AIRCRAFT
• FLIGHT SIMULATORS
• GUSTS
• LOW ALTITUDE
• MATHEMATICAL ANALYSIS
• MATHEMATICAL MODELS

Subject Categories:

• Aerodynamics
• VSTOL

Distribution Statement:

APPROVED FOR PUBLIC RELEASE