Accession Number : ADA139367

Title :   Evaluation of Ride Quality Prediction Methods for Helicopter Interior Noise and Vibration Environments

Descriptive Note : Technical paper

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER

Personal Author(s) : Leatherwood, Jack D ; Clevenson, Sherman A ; Hollenbaugh, Daniel D

PDF Url : ADA139367

Report Date : Mar 1984

Pagination or Media Count : 46

Abstract : This paper presents the results of a simulator study conducted to compare and validate various ride quality prediction methods for use in assessing passenger/crew ride comfort within helicopters. Included are results quantifying 35 helicopter pilots' discomfort responses to helicopter interior noise and vibration typical of routine flights, assessment of various ride quality metrics including the NASA ride comfort model, and examination of possible criteria approaches. Results of the study indicated that crew discomfort results from a complex interaction between vibration and interior noise. Overall measures such as weighted or unweighted root-mean-square acceleration level and A-weighted noise level were not good predictors of discomfort. Accurate prediction required a metric incorporating the interactive effects of both noise and vibration. The best metric for predicting crew comfort to the combined noise and vibration environment was the NASA discomfort index.

Descriptors :   *AIRCRAFT NOISE, *HELICOPTERS, *RIDE QUALITY, *VIBRATION, FLIGHT CREWS, HUMAN FACTORS ENGINEERING, INTERACTIONS, INTERNAL, NOISE REDUCTION, PASSENGERS, PREDICTIONS, QUESTIONNAIRES, RATINGS, REACTION(PSYCHOLOGY)

Subject Categories : Helicopters
      Acoustics
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE