Engineering topics
Forgrave, J.
Publications and source records attributed to Forgrave, J..
Review and Assessment of JPL's Thermal Margins
JPL has captured its experience from over four decades of robotic space exploration into a set of design rules. These rules have gradually changed into explicit requirements and are now formally implemented and verified. Over an extended period of time, the initial understanding of intent and rationale for these rules has faded and rules are now frequently applied without further consideration. In the meantime, mission classes and their associated risk postures have evolved, coupled with resource constraints and growing design diversity, bringing into question the current "one size fits all" thermal margin approach. This paper offers a systematic review of the heat flow path from an electronic junction to the eventual heat rejection to space. This includes the identification of different regimes along this path and the associated requirements. The work resulted in a renewed understanding of the intent behind JPL requirements for hot thermal margins and a framework for relevant considerations, which in turn enables better decision making when a deviation to these requirements is considered.
Development of a Micro-Isolation Valve
A feasibility investigation for a newly proposed microfabricated, normally-closed isolation valve was initiated.
Cassini Environmental Test and Analysis Program Summary
This paper presents an overview of the Cassini Project's environmental test and analysis program during the spacecraft development phase - October 1989 to launch in October 1997.
The Micro-Isolation Valve Concept: Initial Results of a Feasibility Study
A feasibility investigation for a newly proposed microfabricated, normally-closed isolation valve was initiated.
Finite Element Analysis of the Microisolation Valve
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Finite Element Analysis of the Microisolation Valve
Agenda: Design and Use of the Microisolation Valve; Geometry of the Microisolation Valve; FEA Model Objectives; Results of the 10 and 50 microns Thick Wall Models; Results of the Thermally-Induced Stresses.
The Micro-Isolation Valve: Introduction of Concept and Preliminary Results
Strong recent interest with the aerospace community to build smaller spacecraft necessitates the development of space hardware able to fit the unique requirements with respect to mass, size, and power.