Task Display Reading Performance Under Lateral Whole-Body Vibration Due to 12-Hz Thrust Oscillation (Completed)
Last Published:  07/29/22 01:33:24 PM (Central)
Short Title: Lateral Vibration
Responsible HRP Element: Space Human Factors and Habitability
Collaborating Org(s):
Funding Status: Completed - Task completed and produced a deliverable
Procurement Mechanism(s):

The Space Launch System (SLS) vibration profile is different than Ares profiles tested previously. We do not know the impact of lateral vibration on ability to read displays.

  1. Determine observer reading task performance in laboratory experiment (i.e., 1-Gx bias) for lateral vibration bracketing the amplitudes of concern (~ 0.25 gzero-peak) over frequency range of interest (10-13 Hz).

This task addressed HAB-03 interim step bullet 5. Results from this study were provided to SLS and Orion stakeholders and were incorporated into the program’s revised thrust oscillation (TO) requirements and/or technical performance measures. The study informed the development of a new requirement by SLS-Multi-Purpose Crew Vehicle (MPCV) limiting 10-13 Hz TO-driven lateral vibration to ≤ 0.7 g (peak) and ≤ 0.5 g-rms (5-s running window).

The results are also available for inclusion in Human Integration Design Handbook (HIDH) as new information on visual tolerance to 12-Hz lateral vibration. The study also identified needs for future work to be carried out under the appropriate HRP Evidence Report vibration risk statements.

This will close the gap on the effects of 12-Hz lateral vibration on visual performance. A new round of human-in-the-loop testing could become necessary if projected lateral vibration levels were to increase during future vehicle design.

Integration/Unique Aspects:
Orion, Space Launch Systems (SLS) requested this information. Health and Medical Technical Authority (HMTA) and the Astronaut Office were stakeholders.