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The human engineering aspects for manned spacecraft systems, like the Columbus Attached Pressurized Module (APM) as part of the Space Station, request that the audible noise environment for the crew does not exceed certain specified limits. Airborne and structure-borne noise is generated in manned spacecraft systems by several sources and transmitted via a number of transmission paths into the habitable area. The Columbus APM system level audible noise control model is described. The air loops of the Environment Control and Life Support System (ECLS) form a group of major noise sources. The design implications and solutions selected for the ECLS subsystem are presented. A sound power flow model is used for system and subsystem design analysis and verification tasks. Preliminary results about the achievable audible noise environment are given.

The ESA study “Microgravity Payload Disturbances” has the general objective to work out and define a guideline for the design and development and the verification of payloads/experiments with respect to adequate and appropriate microgravity environment compatibility. The guideline shall be made available to the payload contractors and designers as a reference for their planning, design, development, operation and verification of the compatibility of their equipment with the microgravity environment conditions. The aim of the guideline is to establish a comprehensive payload design compliant with the stringent microgravity environment requirements. Therefore the paper addresses the description of computational models for the payload disturbance sources which are classified into rotational, translational, acoustical and shock type disturbance sources. The description of these sources includes a suitable interface to the payload and spacecraft.