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The Global ETD Search service is a free service for researchers
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Showing 1 to 10 of 10 (0.02 seconds)Spelling suggestions: "subject:"vacuum pump"" "subject:"vacuum jump""
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Synchronized Motion Control of Dual MotorsHsueh, Po-Wen 04 July 2001 (has links)
Coordinated or synchronized tasks can always
be found in various manufacturing processes,
e.g., machining along spatial trajectories,
coordinated operations of multi-manipulators, and
vacuum pumps, etc. The vacuum pump is a typical
device with synchronized motion among those
examples. The vacuum pump has played an important
role in current semiconductor manufacturing
processes. Its pumping feature is achieved by
synchronized motion of two mating pump rotors. A
common approach to accomplish the synchronized
motion is by idle gears. Nevertheless, this
design cannot meet serious requirements of vacuum
systems demanded by growing manufacturing
techniques.
In order to provide a complete and proper
control strategy for synchronized motion, and to
overthrow traditional architecture of vacuum
pumps by raising a better control scheme for new
generation oil-less products, the paper focuses
on synchronized motion control for dual motors.
The first objective of here is to develop a
control method for synchronized motion of two
separated motors. Both system uncertainties and
unknown disturbances occurring in actual
implementation need to be carefully considered.
An experimental setup will also be established
for examinations and verifications. And then
synchronized motion control of dual motors
including two mating screw rotors then will be
investigated. During this period, the emphasis
will be on solution finding for unexpected
contact collision between two rotors. An
effective and efficient control strategy will be
developed for synchronized motion control of dual
motors. Longer operation time and better
synchronization performance for two motors can
therefore be anticipated.
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Synchronized Motion Control with Impact Model for Dual MotorsWang, Yu-Wen 03 July 2002 (has links)
Abstract
Coordinated or synchronized tasks can always be found in various manufacturing processes, e.g., machining along spatial trajectories, coordinated operations of multi-manipulators, and vacuum pumps, etc. The vacuum pump is a typical device with synchronized motion among those examples. The vacuum pump has played an important role in current semiconductor manufacturing processes. Its pumping feature is achieved by synchronized motion of two mating pump rotors. A common approach to accomplish the synchronized motion is by idle gears. Nevertheless, this design cannot meet serious requirements of vacuum systems demanded by growing manufacturing techniques.
In order to provide a complete and proper control strategy for synchronized motion, and to overthrow traditional architecture of vacuum pumps by raising a better control scheme for new generation oil-less products, the paper focuses on synchronized motion control for dual motors. The first objective of here is to develop a control method for synchronized motion of two separated motors. Both system uncertainties and unknown disturbances occurring in actual implementation need to be carefully considered. An experimental setup will also be established for examinations and verifications. And then synchronized motion control of dual motors including two mating screw rotors then will be investigated. During this period, the emphasis will be on solution finding for unexpected contact collision between two rotors. An effective and efficient control strategy will be developed for synchronized motion control of dual motors. Longer operation time and better synchronization performance for two motors can therefore be anticipated.
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BYU Diesel Engine Lab Setup and Parasitic Losses of the Water Pump and Vacuum Pump on a Cummins 2.8L EngineJessup, Eric Ashton 05 June 2020 (has links)
The need to minimize carbon dioxide (CO2) emissions is becoming increasingly important with the total number of vehicles throughout the world exceeding one billion. Carbon dioxide emissions can be reduced by improving vehicle fuel efficiency. While electric transportation is gaining popularity, most passenger vehicles are still powered by gasoline or diesel engines. The main objective of this work was to provide opportunities for studying and improving the fuel efficiency of internal combustion engines (ICE). This was achieved by 1) Designing, building and testing auxiliary systems necessary to run a Cummins 2.8 L engine in a an engine test cell; 2) Creating educational labs for the ICE class; and 3) Measuring the parasitic losses of the vacuum pump and water pump on the installed Cummins 2.8 L diesel engine. All auxiliary systems were completed at a hardware cost of $8100 and are rated to support an engine with the power output capacity of 233 kW (312 hp). The educational laboratories enable future engineers to measure and assess the efficiency of internal combustions engines. The parasitic losses of the vacuum pump and water pump were found to impact the relative brake fuel conversion efficiency by 1.3% and 1.5% respectively over the Federal Test Procedure (FTP) cycle.
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Návrh aplikační cisterny pro nosič výměnných nástaveb MEGA 33 / The application tanker for the trailer MEGA 33Koukal, Vojtěch January 2017 (has links)
This diploma thesis deals with conceptual design of application tanker for swap carrier MEGA 33. The first part of the thesis is focused on filling and emptying process possibilities, material alternatives used for the tankers manufacturing and evaluation of tankers with similar construction solution. The main part of this thesis describes conceptual design of tanker carrier. On the basis of this concept the stress analysis using finite element method has been completed. This thesis also includes relevant drawing documentation.
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Zvýšení sací schopnosti hasičské stříkačky / Improvement of the suction capacity of the fire-engine pumpArchalous, Jakub January 2011 (has links)
This diploma thesis deals with reducing the time of sucking water into the rotating impeller of the centrifugal pump as used in firesport. The suction is carried out by the ejector, which is powered by combustion engine exhaust gases. A mathematical model was created, which shows the flow in the ejector. It was also used as a basis for the creation of a new ejector, which has an increased airflow when getting closer to atmospheric pressure.
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Quantifying the impact of pump performance, chemical conversion, and material properties on solar hydrogen productionJarrett, Colby Lewis 07 January 2016 (has links)
As renewable energy production becomes more prevalent, the challenge of producing renewable dispatchable fuel for the transportation sector remains unresolved. One promising approach is to produce hydrogen from solar energy with a two step thermochemical cycle which utilizes an oxygen storage material (OSM) to split water through two reversible reactions. Due to the strong coupling between reactor design, operational parameters, and OSM properties, the direct comparison of two OSMs is not straightforward. In order to guide the designs of OSMs for two-step thermochemical hydrogen production, a methodology is developed to model the max performance possible for a two-step thermochemical cycle. The novel contribution of this model considers the strong coupling between reactor operation, OSM properties, and reactor performance. Next, a method for screening and evaluating new OSMs which utilizes thermogravimetric analysis (TGA) is proposed. With this data, the modeling method previously developed is applied to determine maximum reactor efficiency possible with new materials. This allows many materials to be evaluated quickly, and facilitates further characterization new OSMs. Additionally, by comparing the predicted maximum efficiency of a new material with the efficiency of current ones, this method facilitates the comparison of two different OSMs on equal footing.
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Modeling and model based fault diagnosis of dry vacuum pumps in the semiconductor industryChoi, Jae-Won, active 2013 11 February 2014 (has links)
Vacuum technology is ubiquitous in the high tech industries and scientific endeavors. Since vacuum pumps are critical to operation, semiconductor manufacturers desire reliable operations, ability to schedule downtime, and less costly maintenance services. To better cope with difficult maintenance issues, interests in novel fault diagnosis techniques are growing. This study concerns model based fault diagnosis and isolation (MB-FDI) of dry vacuum pumps in the semiconductor industry. Faults alter normal operation of a vacuum pump resulting in performance deviations, discovered by measurements. Simulations using an appropriate mathematical model with suitably chosen parameters can mimic faulty behavior. This research focuses on the construction of a detailed multi-stage dry vacuum pump model for MB-FDI, and the development of a simple and efficient FDI method to analyze common incipient faults such as particulate deposition and gas leak inside the pump. The pump model features 0-D thermo-fluid dynamics, scalable geometric representations of Roots blower, claw pumps and inter-stage port interfaces, a unified pipe model seamlessly connecting from free molecular to turbulent regimes, sophisticated internal leakage model considering true pump geometry and tribological aspects, and systematic assembly of a multi-stage configuration using single stage pump models. Design of a simple FDI technique for the dry vacuum pump includes staged fault simulations using faulty pump models, parametric study of faulty pump behaviors, and design of a health indicator based on classification. The main research contributions include the developments of an accurate multi-stage dry pump model with many features not found in existing pump models, and the design of a simple MB-FDI technique to detect and isolate the common faults found in dry vacuum pumps. The proposed dry pump model can pave the way for the future development of advanced MB-FDI methods, also performance improvement of existing dry vacuum pumps. The proposed fault classification charts can serve as a quick guideline for vacuum pump manufactures to isolate roots causes from faulty symptoms. / text
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名古屋大学タンデトロンAMS14Cシステムの現状と利用(2012)Tomiyama, Shinji, Hase, Kazuma, Soda, Aoi, Kato, Tomomi, Jyomori, Yuka, Ikemori, Kazufumi, Nishida, Masami, Ohta, Tomoko, Miyata, Yoshiki, Hakozaki, Masataka, Itoh, Kazumi, Hitoki, Eri, Ikeda, Akiko, Oda, Hirotaka, Minami, Masayo, Nakamura, Toshio, 冨山, 慎二, 長谷, 和磨, 早田, 葵, 加藤, ともみ, 城森, 由佳, 池盛, 文数, 西田, 真砂美, 太田, 友子, 箱崎, 真隆, 宮田, 佳樹, 伊藤, 一充, 一木, 絵理, 池田, 晃子, 小田, 寛貴, 南, 雅代, 中村, 俊夫 03 1900 (has links)
名古屋大学年代測定総合研究センターシンポジウム報告
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Vyhodnocení vlivu tlaku v komoře vzorku a velikosti clonek na výsledný tlak u scintilátoru detektoru pomocí systému Cosmos FloWorks / Using Cosmos FloWorks for analyse the detector.Bordovský, Petr January 2010 (has links)
This work deal with the analysis of influence of pressure‘s sizes in vacuum chamber of specimen Evironmental Scanning Electron Microscope and the influence of sizes of aperture diaphragm by scintillation detector. The analysis proceeds in detector of secondary electrons. The detector is modelled by system 3D CAD SolidWorks with the help of system CAE Cosmos FloWorks.
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Johann Friedrich von Uffenbach. Sammler – Stifter – Wissenschaftler / Johann Friedrich von Uffenbach. Collector - Donor - ScientistMeyerhöfer, Dietrich 28 January 2020 (has links)
No description available.
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