Specification • The following sections define some important design constraints that the program will levy on the system. The constraints will drive many of the choices in designing the mechanical system.
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Design Thickness
Specification • For strength and buckling analyses, minimum material thickness shall be used. Minimum thickness is defined as the nominal thickness minus the lower tolerance and applies to metallic and nonmetallic structural elements. For modeling purposes and stiffness calculations, use nominal or expected values. For flexures the Maximum blade thickness shall be...
Design Ultimate Load
Specification • The JAS mechanical structure shall have sufficient strength to simultaneously withstand design ultimate loads, the corresponding temperature, pressure and accompanying environmental phenomena without failure.
Design Yield Load
Specification • The JAS mechanical structure shall withstand design yield loads, the corresponding temperature, pressure and associated environmental phenomena without permanent deformations, or permanent misalignments, of all components.
Device Access Service
Specification • The device access service, service type address 128, is used to request parameters from or command parameters to a specific device. The currently defined device access service parameters are shown in the following table. Service Type Service Subtype Subtype Description Cmd Tlm Service Parameters Data Types and Description 128 1...
Discrete Signaling
Profile • SMAC Discrete I/O and Data Bus Signaling The SMAC has capabilities to read and drive both discrete I/O values and data buses. The FPGA I/O dedicated for this purpose can be either configured as dedicated inputs and outputs or can be bi-directional with input or output behavior configured through the...
ECSS Packet Utilization Standard
Specification • The figures below show a PUS telecommand and telemetry packet and their utilization within the CCSDS space packet specification. The PUS specification uses the user-definable fields of the CCSDS space packet in order to create a PUS packet. The specification defines a secondary header that provides additional metadata such as...
Electrical Bonding
Specification • Each equipment design shall provide electrical continuity across mechanical interfaces in accordance with the design requirements of this specification. Electrical continuity will be achieved to the maximum practical extent by direct metal-to-metal contact across the entire interface surface. If the electrical resistance across mechanical interfaces is measured to be less...
Electrical Interconnects
Specification • JAS electrical design shall utilize commercial interconnect standards when applicable. The following sections are some examples of commercial interconnect standards that are recommended but not required.
Electrical Specification
Specification • The Electrical Specification provides details about power distribution, electrical interconnects, and communication data links that are used within a JAS-based system. The figure below provides context of where the Electrical Specification resides in the JAS standard. JAS Standard Hierarchy
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