Task Space Craft Internal Acoustic Environment (Completed)
Last Published:  11/23/20 11:55:12 AM (Central)
Short Title: Acoustics Modeling
Responsible HRP Element: Space Human Factors and Habitability
Collaborating Org(s):
Funding Status: Completed - Task completed and produced a deliverable
Procurement Mechanism(s):
Directed
Aims:

Acoustic modeling can be used to identify key noise sources, determine/analyze sub-allocated requirements, keep track of the accumulation of minor noise sources, and to predict vehicle noise levels at various stages in the development, first with estimates of noise sources, later with experimental data.  Bench testing of isolated systems alone is not sufficient as the installation effects are often not known. 
Acoustic modeling will be used:

  1. Determined installation effects, reverberation (room geometry) effects, and used to identify propagation paths and possible noise controls, as well as develop an understanding of the resulting acoustic levels in the composite environment. 
  2. Assisted with the development and implementation of spaceflight acoustic materials and  predicted their effectiveness including sound containment, absorption and vibration isolation.

The Acoustics Modeling Task completed all if its aims, contributing to closure of the HAB acoustic model gap as written. Acoustic modeling capability to predict resultant levels and spacecraft reverberation characteristics from bench testing of isolated systems, acoustic material sample data, and vehicle geometry has been validated for air-borne noise propagation.  Results from this research were provided to the Constellation Program including Crew Exploration Vehicle (CEV) and Altair Lunar Lander Projects so that a more informed oversight of the vehicle development could be implemented with insertion of critical information such as validation of noise allocations for sub-systems, estimation of vehicle noise levels, and identification of potential acoustic problem areas and possible solutions. The capability developed under this project has been used to validate acoustic models and noise control approaches for application to the Orion Crew Exploration Vehicle and Altair Lunar Lander. In addition, applications of the acoustics modeling to interior space design were provided for addition to the Human Interface Design Handbook (HIDH) in the form of recommendations and guidelines. Structural damping measurement, structure-borne noise modeling, and human body acoustic modeling are still in need of development.

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