RemoveDEBRIS, a low Earth orbit test bed for determining the efficacy of activedebrisremoval (ADR) systems, is a multinational effort involving space agencies, aerospace experts, and technologies from throughout Europe, Asia, Africa, and the U.S.
This Extra Vehicular Activity (EVA) removal of Foreign Object Debris (FOD) was performed on January 15, 2003. The concern began during post-flight inspections of the Passive Common Berthing Mechanism (PCBM) on the Utility Flight (UF) UF-2 (STS-111) Multipurpose Logistics Module (MPLM). ...Material analysis determined the debris contained Starblast™, a sandblasting material used to clean the launch pad. Debris corresponding to the MPLM CBM debris was found on the International Space Station (ISS) Node 1 Nadir CBM sealing surface during a Space Station Remote Manipulator System (SSRMS) camera survey of the Node 1 Nadir CBM. ...Since this MPLM had mated to Node 1 Nadir CBM during the UF-2 berthing, a conclusion was drawn that the debris was deposited on the Active Common Berthing Mechanism (ACBM) sealing surface (Node 1 Nadir CBM) from the UF-2 MPLM and that the ISS Node 1 Nadir CBM FOD contained the sandblasting material Starblast™.
The purpose of this SAE Aerospace Information Report (AIR) is to disseminate qualitative information regarding foreign object debris (FOD) damage to the gas path of rotorcraft gas turbine engines and to discuss methods of FOD prevention.
Numerous benefits are found in using an electrical discharge handheld machine for removal. Ergo-Tech® fasteners can be removed in seconds instead of minutes. The removal process is silent, FOD free, and requires minimal force to be applied by the technician. ...All liquids and debris created by the removal process are contained within the system, and collected within the internal filtration system for simple operation. ...A new fastener removal system which utilizes the principle of electrical discharge machining is evaluated. The system is portable, and includes a handheld gun which is approximately the size of a typical fastener installation tool.
The current design utilizes the Volatile Removal Assembly (VRA) which operates at 125°C to catalytically oxidize these contaminants. Since decomposition of these organics under milder conditions would be beneficial, several ambient temperature biocatalytic and catalytic processes were evaluated in our laboratory. ...Importantly, both alcohols and glycols were efficiently oxidized at ambient temperature using a highly active, bimetallic noble metal catalyst. Adsorption onto activated carbon formed from pyrolyzed polymeric beads was shown to be the most practical method for acetone removal. ...Adsorption onto activated carbon formed from pyrolyzed polymeric beads was shown to be the most practical method for acetone removal.
This SAE Aerospace Information Report (AIR) provides information on the possible methods of sealant removal. The discussion will focus on the methods of sealant removal and give the strengths and weaknesses of each method.
No ethylene removal by the biofilter receiving air containing 1 ppm ethylene was observed, perhaps, because the loading rate was insufficient to maintain an active culture. ...No ethylene removal by the biofilter receiving air containing 1 ppm ethylene was observed, perhaps, because the loading rate was insufficient to maintain an active culture. Work is underway to further investigate these limits to enable improvement in biofilter performance.
A savings in launch weight, storage volume and life cycle cost may be achieved by incorporating a regenerable CO2 removal system into the EMU. This paper will discuss regenerable CO2 sorbents and their impact on the life support system of an EMU.
Shortcomings in these critical maintenance actions, and/or wear modes which result in product failure between scheduled inspection intervals, compromise the effectiveness of this method of wear debris monitoring. The General Electric GE90 engine utilizes the Quantitative Debris Monitor (QDM ®), developed by Vickers, Tedeco Division. ...The QDM system - the first and only advanced, remote-indicating lube debris monitor qualified for commercial flight service - continuously monitors the lube oil for the presence of wear debris. The system is capable of counting individual debris particles and distinguishing their size relative to a preset “target” threshold. ...Wear debris monitoring is the most effective technique available for detecting impending failure of oil-wetted components.
The increasing concern in the space debris to spacecraft, above all long-term missions as the international space station, has increased the demand of reliable analysis tools, raised from industry and agencies. ...The improvement of environment models and hypervelocity impact predictions has increased the physical available knowledge to software designers. The DEBRIS application of ESABASE is a software simulation tool to assess the number of impacts and the resulting damage from meteoroids and space debris particles to spacecraft in low Earth orbit for user specified mission parameters and shielding designs. ...The DEBRIS application of ESABASE is a software simulation tool to assess the number of impacts and the resulting damage from meteoroids and space debris particles to spacecraft in low Earth orbit for user specified mission parameters and shielding designs.
The latest innovations in sensor technology now permit on-line oil debris based diagnostics to attain the same status as such more traditionally monitored system parameters as vibration, oil quantity, pressure and temperature. ...This technology will permit the early detection of fluid system component failures and the reduction of “no-fault-found” indications to an extent never before possible using conventional debris monitoring methods. This paper will discuss the details of this technology - in the form of new sensors, supporting integrated circuits and novel oil debris separator/filter combinations - for engine applications. ...This paper will discuss the details of this technology - in the form of new sensors, supporting integrated circuits and novel oil debris separator/filter combinations - for engine applications.
Hamilton Standard has developed a non-venting Metal Oxide Regenerable EMU CO2 Removal Subsystem (MORES) for the NASA Johnson Space Center. This system has the potential for application to an Advanced EMU or retrofit to the existing Shuttle EMU. ...The MORES system uses a catalyzed, silver based metal oxide to achieve the CO2 removal during Extravehicular Activity (EVA) and uses no supplemental cooling. Regeneration is easily accomplished using cabin air in a simple hot air regeneration process. ...However, total system weight, volume and complexity will increase with incorporation of an active cooling system. This paper details the history and current status of the MORES development activity at Hamilton Standard.
Improved understanding of the orbital debris environment in recent years and the prospect of significantly increased extravehicular activity (EVA) for the assembly and maintenance of Space Station Freedom have resulted in increased focus on the potential hazards to the EVA crewmembers from the micrometeoroid and orbital debris environments. ...Improved understanding of the orbital debris environment in recent years and the prospect of significantly increased extravehicular activity (EVA) for the assembly and maintenance of Space Station Freedom have resulted in increased focus on the potential hazards to the EVA crewmembers from the micrometeoroid and orbital debris environments. While the hazards associated with any individual EVA remain extremely small, some estimates of the cumulative risks over the anticipated duration of the Space Station Program have been appreciable. ...These estimates, based on analytical models which treat the micrometeoroid and debris environments as isotropic, suggest the desirability of substantially modifying either the extravehicular mobility unit (EMU) or the planned EVA profiles for space station to reduce these hazards.
The British Royal Navy is currently deploying a new CO2 removal system for use in disabled submarines when the air circulation and monitoring system is shutdown. ...The reaction model is designed to depend only on the surrounding CO2 concentration and the quantity of active material remaining in the RPCs, and so can be applied to any simulation involving RPCs. The RPC reaction model has been validated against experimental data from RPC performance trials in a hyperbaric chamber.
The debris dispersion model during launch is so heterogeneous and interrelated with various factors; 3D graphics combined with physical models are useful in understanding the complexity of launch and range operations.
This paper presents the active thermal control architecture of Columbus Pressurized Modules. APM (Attached Pressurized Module) and PM-MTFF (Pressurized Module, coupled to the Resource Modute to form the MTFF, Man Tended Free-Flyer). ...APM (Attached Pressurized Module) and PM-MTFF (Pressurized Module, coupled to the Resource Modute to form the MTFF, Man Tended Free-Flyer). Active thermal control architecture consists of: module- internal water loops collecting heat from directly interfacing P/L's and S/S's, avionic and cabin air loops external freon loop (PM MTFF only) providing removal and transportation of water loop heat loads to the heat rejection system SS (Space Station) based thermal bus providing removal and rejection of docked element water loops heat loads loop control and monitoring functions provided by modulating pumps and valves, temperature, pressure sensors interfacing with an intelligent control unit. ...Active thermal control architecture consists of: module- internal water loops collecting heat from directly interfacing P/L's and S/S's, avionic and cabin air loops external freon loop (PM MTFF only) providing removal and transportation of water loop heat loads to the heat rejection system SS (Space Station) based thermal bus providing removal and rejection of docked element water loops heat loads loop control and monitoring functions provided by modulating pumps and valves, temperature, pressure sensors interfacing with an intelligent control unit.