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Environmental Specification

Specification • The Environmental Specification provides details about environmental design considerations that should be considered for space applications of JAS. The figure below provides context of where the Environmental Specification resides in the JAS standard. JAS Standard Hierarchy

Environmental Specification

Environmental Test Flow

Specification • Programs using JAS should practice testing per industry standards wherever possible. The following tests and operational environments shall be applied to the components or structure in the following order. Events 1 through 5 shall be used for qualification acceptance testing. Events 1-6 shall be considered for fatigue calculations. 1) 24ea,...

Environmental Specification > Environmental Test Flow

Humidity

Specification • The JAS housing shall meet all performance specifications during exposure to relative humidity varying from 0% to 60%.

Environmental Specification > Humidity

Loads

Specification • Loads shall be determined per the program Strength Qualification Plan.

Environmental Specification > Loads

Operating Temperatures

Specification • Operational temperatures are provided in thermal study for the nominal orbit. Excursions from predicted operational temperatures shall be increased by 11C (bilateral) when these temperatures are utilized in all fatigue analysis. For the purposes of fatigue the temperature excursion within an orbital season may be considered. For the purposes of...

Environmental Specification > Operating Temperatures

Operational Vibrations

Specification • The JAS housing shall meet all of the displacement budgets, while subjected to the operational environment produced by the acceleration in file, TBD. These shall be used as base inputs.

Environmental Specification > X,Y, and Z Axis Random Vibration > Operational Vibrations

Orientation

Specification • The JAS housing shall meet mechanical alignment performance specifications in any direction.

Environmental Specification > Orientation

Pressure

Specification • The JAS structure shall meet all performance specifications during and after exposure to pressures varying from atmospheric to the space environment of 10-14 Torr. All thermal-vacuum ground based testing shall be conducted at pressures less than 10-6 Torr.

Environmental Specification > Pressure

Pressure Change

Specification • The structure shall be designed to survive the change of pressure specified in the figure below. The launch and ascent pressure environment will lie between Pc(Max) and Pc(MIN). Pressure Change Within the envelope defined in figure above, the local rates of change will remain between the values shown in the...

Environmental Specification > Pressure > Pressure Change

Quasi-Static Loads

Specification • Quasi-static loads shall be applied per the program Strength Qualification Plan. The axial and radial acceleration loads are to be applied simultaneously for an 11 g (TBD?) load in the worst case direction.

Environmental Specification > Loads > Quasi-Static Loads

Radiation Effects Mitigation

Specification • The primary space effect requiring mitigation is the radiation environment, which causes gradual degradation of electronic devices and single event effects (SEE). Parts that have demonstrated destructive SEE, such as SEL or SEGR, should not be incorporated into the node unless absolutely necessary. It is equally important to test the...

Environmental Specification > Radiation Effects Mitigation

Survival Temperatures

Specification • The JAS support shall meet all performance specifications after being exposed to a minimal temperature range from -40 C to +60 C.

Environmental Specification > Survival Temperatures

Vibration (Random)

Specification • The JAS housing support shall meet all performance specifications after being subjected to the vibration level prescribed by figure 5.5.1. This spectrum shall be applied, to the mounting brackets.

Environmental Specification > Vibration (Random)