244 research outputs found
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Application of precision engineering for nanometre focussing of hard X-rays in synchrotron beam lines
This thesis was submitted for the degree of Master of Philosophy and awarded by Brunel University.Many modern synchrotron beamlines are able to focus X-rays to a few microns in size. Although the technology to achieve this is well established, performing routine experiments with such beams is still time consuming and requires careful set up. Furthermore there is a need to be able to carry out experiments using hard X-ray beams with even smaller beams of between 100nm and 10nm. There are focussing optics that are able to do this but integrating these optics into a stable and a usable experimental set up are challenging. Experiments can often take some hours and any change in position of the beam on the sample will adversely affect the quality of the results. Experiments will often require scanning of the beam across the sample and so mechanisms suitable for high resolution but stable scanning are required.
Performing routine experiments with nanometre sized beams requires mechanical systems to be able to position the sample, focussing optics, detectors and diagnostics with significantly higher levels of stability and motion resolution than is required from so called micro focus beam lines.
This dissertation critically reviews precision engineering and associated technologies that are relevant for building nano focus beamlines, and the following key issues are explored:
⢠Long term position stability due to thermal effects
⢠Short term position stability due to vibration
⢠Position motion with nanometre incremental motion
⢠Results of some tests are presented and recommendations given.
Some test results are presented and guidance on designing nano focus beamlines presented.Diamond Light Sourc
Combination Twist Compression and Four-Ball Test Device
Final report and prototype photo for Project 22 of ME450, Fall 2009 semester.Many lubricants contain additives that are designed to improve performance under high pressure conditions. There are a number of test devices that are designed to evaluate these extreme pressure additives, however, they do not always correlate. Two common test devices are the twist-compression test and the four-ball test. The goal of this project is to design a single device that performs both tests.Gordon Krauss (Mechanical Engineering, U of M)http://deepblue.lib.umich.edu/bitstream/2027.42/86215/1/ME450 Fall2009 Final Report - Project 22 - Combination Twist Compression and Four-Ball Test Device.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/86215/2/ME450 Fall2009 Prototype Photo - Project 22 - Combination Twist Compression and Four-Ball Test Device.jp
Alignment of lines in space (with particular reference to laser-fibre coupling)
The object of this work (featuring the study of alignment of lines in
space) is to produce a novel system for automatic production of
optoelectronic components. It begins by reviewing the different
components associated with optical fibre transmission and examines
the existing laser-fibre coupling methods. The manual alignment
technique adopted by STC to align a laser beam with a monomode
optical fibre is then presented.
The various interpretations of alignment are explored. The results
obtained from the analysis determine the type of manipulator required
for laser to optical fibre coupling. The central axis of a divergent
beam emitted by a semi-conductor laser diode is manipulated for
alignment with the axis of the fibre. Such an alignment places
stringent displacement tolerance and accuracy demands on the
manipulator.
To construct a manipulator, actuators need to be coupled together.
The coWling methods are studied and presented. Prior to this study,
commercially available actuators are surveyed leading to the
selecticin of the Oriel Encoder Mike actuator. This actuator exhibits
some inherent control problems but meets the laser-fibre coupling
accuracy demands. Various types of couplings are also examined based
on the expansion of the Kelvin coupling for the construction of a
four degree of freedom manipulator. A computational algorithm
analogous to that used to solve two plane balancing problems is
sucessfully tested on this manipulator for alignment of a
conventional He-Ne laser beam with the centres of two transparent
screens. This algorithm requires linearity for its success. For this
reason and for purposes of completeness, spatial displacement
characteristics of the manipulator are analysed and confirmed
experimentally.
This work ends with the ocnstruction. and testing of a program based
on a hill climbing technique for the control of a three degree of
freedom (Oriel Encoder Mike) manipulator to align a laser beam
emitted by a semi-conductor laser diode with a monomode optical fibre
Final Design Report: Allergen Mixing Assistant (AMA) Micro-Refrigeration Redesigning
Abstract
Allergen Mixing Assistant (AMA) by Xtract Solutions is a device designed to more âeffectively refrigerate, organize, and mix allergenic extractsâ. Although Xtract Solutions intended the product to be fully automated, the company has decided against its automation and declared its current design as a minimum viable product whose components are too expensive, difficult to source and complex. Therefore, Cal Poly AMA design team - Mitchell Parks and Minwoo Suh - has decided to replace these expensive components with much more economical alternatives as shown below:
Stirling cooler
â
Thermoelectric (Peltier) cooler
Custom Arduino
Controller Card
â
TEC Thermostat ***
Original Housing with Wasted Space *
â
New Housing **
The cost analysis of the new design quotes the Allergen Mixing Assistant at 830. Beyond its cost-effectiveness, the new Allergen Mixing Assistant has been improved from its previous design in following categories: 1, more effective cooling; and 2, better packaging - its overall physical dimensions have been reduced. Testing proved that a larger focus on heat rejection is needed to maintain the desired set temperature. Due to insufficient heat dissipation our new unit is unable to run for extended periods of time, but will be a viable option if a larger heat sink can be obtained
Voyager spacecraft phase B, task D. Volume 2 - System description. Book 4 - Engineering mechanics, propulsion, planet scan platform Final report
Structural design and engineering mechanics of baseline Voyager spacecraft, propulsion support, and planetary scan platfor
Conference on Thermal Issues in Machine Tools: Proceedings
Inhomogeneous and changing temperature distributions in machine tools lead to sometimes considerable quality problems in the manufacturing process. In addition, the switching on and off of aggregates, for example, leads to further fluctuations in the temperature field of machine tools. More than 100 specialists discussed these and other topics from the field of thermal research at the 1st Conference on Termal Issues in Machine Tools in Dresden from 22 to 23 March.:Efficient modelling and computation of structure-variable thermal behavior of machine tools
S. Schroeder, A. Galant, B. Kauschinger, M. Beitelschmidt
Parameter identification software for various thermal model types
B. Hensel, S. Schroeder, K. Kabitzsch
Minimising thermal error issues on turning centre
M. MareĹĄ, O. HorejĹĄ, J. Hornych
The methods for controlled thermal deformations in machine tools
A. P. Kuznetsov, H.-J. Koriath, A.O. Dorozhko
Efficient FE-modelling of the thermo-elastic behaviour of a machine tool slide in lightweight design
C. Peukert, J. Mßller, M. Merx, A. Galant, A. Fickert, B. Zhou, S. Städtler, S. Ihlenfeldt, M. Beitelschmidt
Development of a dynamic model for simulation of a thermoelectric self-cooling system for linear direct drives in machine tools
E. Uhlmann, L. Prasol, S.Thom, S. Salein, R. Wiese
System modelling and control concepts of different cooling system structures for machine tools
J. Popken, L. Shabi, J. Weber, J. Weber
The electric drive as a thermo-energetic black box
S. Winkler, R. Werner
Thermal error compensation on linear direct drive based on latent heat storage
I. Voigt, S. Winkler, R. Werner, A. Bucht, W.-G. Drossel
Industrial relevance and causes of thermal issues in machine tools
M. Putz, C. Richter, J. Regel, M. Bräunig
Clustering by optimal subsets to describe environment interdependencies
J. Glänzel, R. Unger, S. Ihlenfeldt
Using meta models for enclosures in machine tools
F. PavliÄek, D. P. Pamies, J. Mayr, S. ZĂźst, P. Blaser, P. HernĂĄndez-Becerro, K. Wegener
Model order reduction of thermal models of machine tools with varying boundary conditions
P. HernĂĄndez-Becerro, J. Mayr, P. Blaser, F. PavliÄek, K. Wegener
Effectiveness of modelling the thermal behaviour of the ball screw unit with moving heat sources taken into account
J. Jedrzejewski, Z. Kowal, W. Kwasny, Z. Winiarski
Analyzing and optimizing the fluidic tempering of machine tool frames
A. Hellmich, J. Glänzel, A. Pierer
Thermo-mechanical interactions in hot stamping
L. Penter, N. Pierschel
Experimental analysis of the heat flux into the grinding tool in creep feed grinding with CBN abrasives
C. Wrobel, D. Trauth, P. Mattfeld, F. Klocke
Development of multidimensional characteristic diagrams for the real-time correction of thermally caused TCP-displacements in precise machining
M. Putz, C. Oppermann, M. Bräunig
Measurement of near cutting edge temperatures in the single point diamond turning process
E. Uhlmann, D. Oberschmidt, S. Frenzel, J. Polte
Investigation of heat flows during the milling processes through infrared thermography and inverse modelling
T. Helmig, T. Augspurger, Y. Frekers, B. DĂśbbeler, F. Klocke, R. Kneer
Thermally induced displacements of machine tool structure, tool and workpiece due to cutting processes
O. HorejĹĄ, M. MareĹĄ, J. Hornych
A new calibration approach for a grey-box model for thermal
error compensation of a C-Axis
C. Brecher, R. Spierling, M. Fey
Investigation of passive torque of oil-air lubricated angular contact ball bearing and its modelling
J. Kekula, M. Sulitka, P. KolĂĄĹ, P. KohĂşt, J. Shim, C. H. Park, J. Hwang
Cooling strategy for motorized spindle based on energy and power criterion to reduce thermal errors
S. Grama, A. N. Badhe, A. Mathur
Cooling potential of heat pipes and heat exchangers within a machine tool spindleo
B. Denkena, B. Bergman, H. Klemme, D. Dahlmann
Structure model based correction of machine tools
X. Thiem, B. Kauschinger, S. Ihlenfeldt
Optimal temperature probe location for the compensation of transient thermal errors
G. Aguirre, J. Cilla, J. Otaegi, H. Urreta
Adaptive learning control for thermal error compensation on 5-axis machine tools with sudden boundary condition changes
P. Blaser, J. Mayr, F. PavliÄek, P. HernĂĄndez-Becerro, K. Wegener
Hybrid correction of thermal errors using temperature and deformation sensors
C. Naumann, C. Brecher, C. Baum, F. Tzanetos, S. Ihlenfeldt, M. Putz
Optimal sensor placement based on model order reduction
P. Benner, R. Herzog, N. Lang, I. Riedel, J. Saak
Workpiece temperature measurement and stabilization prior to dimensional measurement
N. S. Mian, S. Fletcher, A. P. Longstaff
Measurement of test pieces for thermal induced displacements on milling machines
H. HĂśfer, H. Wiemer
Model reduction for thermally induced deformation compensation of metrology frames
J. v. d. Boom
Local heat transfer measurement
A. Kuntze, S. Odenbach, W. Uffrecht
Thermal error compensation of 5-axis machine tools using a staggered modelling approach
J. Mayr, T. Tiberini. P. Blaser, K. Wegener
Design of a Photogrammetric Measurement System for Displacement and Deformation on Machine Tools
M. Riedel, J. Deutsch, J. MĂźller. S. Ihlenfeldt
Thermography on Machine Tools
M. Riedel, J. Deutsch, J. MĂźller, S. Ihlenfeldt
Test piece for thermal investigations of 5-axis machine tolls by on-machine measurement
M. Wiesener. P. Blaser, S. BĂśhl, J. Mayr, K. Wegene
A novel setup for trapping and cooling Barium ions for atom-ion experiments
L'abstract è presente nell'allegato / the abstract is in the attachmen
Proceeding Of Mechanical Engineering Research Day 2016 (MERDâ16)
This Open Access e-Proceeding contains a compilation of 105 selected papers from the Mechanical Engineering Research Day 2016 (MERDâ16) event, which is held in Kampus Teknologi, Universiti Teknikal Malaysia Melaka (UTeM) - Melaka, Malaysia, on 31 March 2016. The theme chosen for this event is âIDEA. INSPIRE. INNOVATEâ.
It was gratifying to all of us when the response for MERDâ16 is overwhelming as the technical committees received more than 200 submissions from various areas of mechanical engineering. After a peer-review process, the editors have accepted 105 papers for the e-proceeding that cover 7 main themes. This open access e-Proceeding can be viewed or downloaded at www3.utem.edu.my/care/proceedings. We hope that these proceeding will serve as a valuable reference for researchers.
With the large number of submissions from the researchers in other faculties, the event has achieved its main objective which is to bring together educators, researchers and practitioners to share their findings and perhaps sustaining the research culture in the university. The topics of MERDâ16 are based on a combination of fundamental researches, advanced research methodologies and application technologies.
As the editor-in-chief, we would like to express our gratitude to the editorial board and fellow review members for their tireless effort in compiling and reviewing the selected papers for this proceeding. We would also like to extend our great appreciation to the members of the Publication Committee and Secretariat for their excellent cooperation in preparing the proceeding of MERDâ16
Laser cooling and trapping with electronically stabilized grating-feedback diode lasers
We have developed simple and inexpensive laser systems
using grating-feedback diode lasers with electronic feedback to the
injection current. These grating-feedback lasers can be
continuously scanned up to 10 GHz and have a linewidth of 150 kHz.
The three electronic frequency-stabilization systems we developed
use polarization spectroscopy, etalon transmission and modified
heterodyne signals as the frequency discriminators to drive an
integrating servo control circuit. These laser systems are used for
laser cooling and trapping of rubidium and atomic beam diagnostics.
The rubidium Dâ line at 780 nm is a strong, cycling transition
that can be used for laser cooling and trapping. We use chirped
cooling and Zeeman-tuned cooling to slow atoms from a thermal
atomic beam. These atoms are loaded into a two-dimensional
magneto-optic trap, or funnel. Using a frequency offset of the
trapping lasers, the atoms are ejected from the funnel at a
controllable velocity. The diode laser systems we have developed
are a central component of this rubidium atomic funnel. We will
use the funnel's bright, cold atomic beam as a source for matter-wave
interferometry. We also developed an ionization detector to
measure the flux and the spatial profile of the atomic beam when
the background of scattered light makes fluorescent detection
difficult
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