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Introduction
Introduction
The Harness subsystem focuses on how to physically connect hardware using wires and connectors. All off-from-board components connections and inter-modular connections will be taken into consideration. Harness subsystem ensures the safety and reliability of power/data interactions between subsystems. The selections of harnessing components (wires, connectors, and etc.) will conform to NASA standard EEE-INST-002. This page contains general harnessing information. For mission-specific information, see the following links:
Design Philosophy
Design Philosophy
The function of harnessing is to electrically connect all subsystems. The overall harness will be divided into two: power distribution and data transmission. Power cables and data cables will be separated so that the noises in the data bus due to currents in the power cable will be eliminated.
The following system block diagram outlines the logic of the harness design.
Figure 1: Harnessing system block diagram
The functions of the harnessing system are shown in the following functional flow block diagram.
Figure 2: Harnessing functional flow block diagram
Key Risks
Key Risks
The key risks of harnessing are collected in the table below:
Risk registry.docxSingle Point Failure Analysis
Single Point Failure Analysis
The single point failure mode on harness's perspective is the failure of connection components (connectors and wires). In this case, every single failure of the inter-modular connectors would fail the whole satellite. If the satellite is properly assembled and the whole satellite assembly is able to pass through the ground test then the likelihood of connector failure is sufficiently low for us to accept this risk.
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