Engineering topics
Man, K.
Publications and source records attributed to Man, K..
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.
Tests and Guidelines for Deep Dielectric Charging in Spacecraft
Spacecraft electric insulators are sources of spacecraft anomalies especially as the spacecraft experiences the radiation belts around Earth.
MEMS Reliability for Space Applications by Elimination of Potential Failure Modes Through Testing and Analysis
As the design of Micro-Electro-Mechanical System (MEMS) devices matures and their application extends to critical areas, the issues of reliability and long-term survivability become increasingly important. This paper reviews some general approaches to addressing the reliability and qualification of MEMS devices for space applications.
Surface Tension Measurements of Liquid Metals by the Quasi-Containerless Pendant Drop Method
The surface tension of liquid metals, Zr, Ni, Ti, Mo, and Nb, have been measured using the quasi-containerless pendant drop method.
Environmental Testing of MEMS for Space Applications
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Environmental Testing of MEMS for Space Applications (Viewgraph Presentation)
Agenda: Environmental Verification Objectives; Test Sequencing; Environmental Design & Test Requirements.
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.
Evaporation Studies of the Metals and Alloys Used in the TEMPUS Flight Experiments
Evaporation rates have been measured for the metals and alloys to be used in the TEMPUS flight experiments in order to facilitate a rational assingnment of a flight sequence that will minimize the effects of particulate and cross contamination.
Resonant Attachment Method for Trace Oxygen Detection
A technique for detecting trace quantities of oxygen has been developed. It utilizes the resonant electron dissociative attachment process.
Resonant Attachment Method for Trace Oxygen Detection
Gaseous contaminants, such as oxygen and water vapor, are often present in containerless materials processing and in semiconductor device fabrication.
UV Fluorescence of Buckminsterfullereness
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Electrostatic Levitator for High-Temperature Containerless Materials Processing
This paper discusses recent developments in high-temperature electrostatic levitation technology for containerless processing of metals and alloys.