Fatigue Evaluation of a MH-60 Helicopter Input Device

Abstract

A preliminary report from a crew station working group (CSWG) suggested that the 0° orientation (from an aerial view) of a new trackball for the MH-60 may introduce undue fatigue for operators. Feedback from the CSWG suggested that this fatigue may be reduced by rotating the trackball inboard in order to keep the wrist straight. To investigate this, in Experiment 1 participants used the trackball for an extended period of time (90 minutes) from various angles (0°, 12°, and 90°). The results from Experiment 1 suggested that 12° was the preferred angle, but qualitative comments suggested that more cant was needed. To address this, in Experiment 2 the angle of the trackball was adjustable from 15° to 35°. Linear regression models estimated the optimal angle to be approximately 25°, confirming the earlier qualitative comments from Experiment 1. Given the broad range in preferred angles, a rotatable trackball was recommended. Furthermore, the qualitative comments from Experiment 1 and 2 were organized into various categories in order to provide additional recommendations for the design of the trackball.

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References

Batra

Dykstra

Hsu

Radle

K. A.

Wiedenbeck

(1998). Pointing device performance for laptop computers. Proceedings of the Human Factors and Ergonomics Society 42nd Annual Meeting, 536–540.

Dimartino

Doné

Judkins

Morse

Melander

Oleynikov

Hallbeck

M. S.

(2004). Ergonomic laparoscopic tool handle design. Proceedings of the Human Factors and Ergonomics Society 48th Annual Meeting, 1354–1358.

Epps

B. W.

(1987). A comparison of cursor control devices on a graphics editing task. Proceedings of the Human Factors and Ergonomics Society 31st Annual Meeting, 442–446.

Hall

Weaver

Burton

(2006). Usability testing of console components: trackball, number entry, and gross navigation. Proceedings of the Human Factors and Ergonomics Society 50th Annual Meeting, 704–708.

Hedge

(1995). Effects of a fixed-angle, split keyboard with center trackball on performance, posture and comfort compared with a conventional keyboard and mouse. Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting, 957.

Huffman

J. A.

Lehman

K. R.

(1997). Pointing devices in the retail environment. Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting, 415–419.

Klatsky

G. J.

Sargent

Rubacka

Vanjaarsveld

Roggenbaum

Platis

(1998). To mouse or not to mouse, is there an alternative? Proceedings of the Human Factors and Ergonomics Society 42nd Annual Meeting, 1615.

Labio

R. S.

Rowan

C. P.

Shattuck

L. G.

(2006). Assessing the impact of input device, button size, and road condition. Proceedings of the Human Factors and Ergonomics Society 50th Annual Meeting, 694–698.

Morag

Shinar

Saat

Osbar

(2003). Trackball modification based on ergonomic evaluation. Proceedings of the Human Factors and Ergonomics Society 47th Annual Meeting, 1235–1239.