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1. Tjepkema, D. Active hard mount vibration isolation for precision equipment.

Degree: Faculty of Engineering Technology, 2012, University of Twente

Floor vibrations and acoustic excitation may limit the performance of precision equipment, that is used for example to produce computer chips or to make images of very tiny structures. Therefore, it is common to mount a vibration isolator in the suspension of such equipment to isolate it from these vibration sources. Most often, a vibration isolator with a low suspension stiffness is used to limit the transmission of floor vibrations onto the suspended equipment. However, a low suspension stiffness introduces problems with leveling of the equipment and it increases its susceptibility to acoustic excitation. The objective of this thesis is to develop an alternative solution based on an active hard mount vibration isolator, which provides a much stiffer suspension such that the problems mentioned before can be circumvented. An active control system, that consists of sensors, actuators and a controller, is used to keep a low transmission of floor vibrations. An additional advantage is that the damping of internal modes of the equipment can be increased, such that its accuracy is improved. Several feedback control strategies for the active hard mount vibration isolator are presented. In both models and experiments it is shown that the best control strategy is using a combination of acceleration and force sensors. Formulas for adjusting the control parameters to obtain the desired vibration isolation performance have been derived. Furthermore, a demonstration setup of a six-axes active hard mount vibration isolator is developed. Unfortunately, due to some hardware problems, the usable control bandwidth is limited and the noise level of the sensors is too high, which results in a vibration isolation performance that is less than desired. Despite these problems, the transmission of floor vibrations is reduced by a factor 18, while simultaneously the suspension stiffness is about 100 times higher as compared to a vibration isolator with a low suspension stiffness. In addition, the damping of the internal modes is increased significantly. Further research should focus on improving the mechanical design of the active hard mount vibration isolator, such that the control bandwidth can be increased, and on using sensors with ultra-low noise levels. Advisors/Committee Members: Soemers, Herman, van Dijk, Johannes.

Subjects/Keywords: METIS-288929; IR-82175; Onderzoek van algemene industriele aardVerbetering van de economische doelmatigheid en van het concurrentievermogenMechanical engineering and technology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Tjepkema, D. (2012). Active hard mount vibration isolation for precision equipment. (Doctoral Dissertation). University of Twente. Retrieved from https://research.utwente.nl/en/publications/active-hard-mount-vibration-isolation-for-precision-equipment(c4bf5887-ef2e-4b31-a544-31a05a3038c9).html ; urn:nbn:nl:ui:28-82175 ; c4bf5887-ef2e-4b31-a544-31a05a3038c9 ; 10.3990/1.9789036534185 ; urn:isbn:9789036534185 ; urn:nbn:nl:ui:28-82175 ; https://research.utwente.nl/en/publications/active-hard-mount-vibration-isolation-for-precision-equipment(c4bf5887-ef2e-4b31-a544-31a05a3038c9).html

Chicago Manual of Style (16th Edition):

Tjepkema, D. “Active hard mount vibration isolation for precision equipment.” 2012. Doctoral Dissertation, University of Twente. Accessed March 06, 2021. https://research.utwente.nl/en/publications/active-hard-mount-vibration-isolation-for-precision-equipment(c4bf5887-ef2e-4b31-a544-31a05a3038c9).html ; urn:nbn:nl:ui:28-82175 ; c4bf5887-ef2e-4b31-a544-31a05a3038c9 ; 10.3990/1.9789036534185 ; urn:isbn:9789036534185 ; urn:nbn:nl:ui:28-82175 ; https://research.utwente.nl/en/publications/active-hard-mount-vibration-isolation-for-precision-equipment(c4bf5887-ef2e-4b31-a544-31a05a3038c9).html.

MLA Handbook (7th Edition):

Tjepkema, D. “Active hard mount vibration isolation for precision equipment.” 2012. Web. 06 Mar 2021.

Vancouver:

Tjepkema D. Active hard mount vibration isolation for precision equipment. [Internet] [Doctoral dissertation]. University of Twente; 2012. [cited 2021 Mar 06]. Available from: https://research.utwente.nl/en/publications/active-hard-mount-vibration-isolation-for-precision-equipment(c4bf5887-ef2e-4b31-a544-31a05a3038c9).html ; urn:nbn:nl:ui:28-82175 ; c4bf5887-ef2e-4b31-a544-31a05a3038c9 ; 10.3990/1.9789036534185 ; urn:isbn:9789036534185 ; urn:nbn:nl:ui:28-82175 ; https://research.utwente.nl/en/publications/active-hard-mount-vibration-isolation-for-precision-equipment(c4bf5887-ef2e-4b31-a544-31a05a3038c9).html.

Council of Science Editors:

Tjepkema D. Active hard mount vibration isolation for precision equipment. [Doctoral Dissertation]. University of Twente; 2012. Available from: https://research.utwente.nl/en/publications/active-hard-mount-vibration-isolation-for-precision-equipment(c4bf5887-ef2e-4b31-a544-31a05a3038c9).html ; urn:nbn:nl:ui:28-82175 ; c4bf5887-ef2e-4b31-a544-31a05a3038c9 ; 10.3990/1.9789036534185 ; urn:isbn:9789036534185 ; urn:nbn:nl:ui:28-82175 ; https://research.utwente.nl/en/publications/active-hard-mount-vibration-isolation-for-precision-equipment(c4bf5887-ef2e-4b31-a544-31a05a3038c9).html


University of South Africa

2. Van Der Watt, Hendrik Herculas. Die toepassing van totale kwaliteitsbestuur aan graadwaardige tersiêre onderriginstellings .

Degree: 1997, University of South Africa

Die noodsaaklikheip om produktiwiteit en kwaliteit in hoer onderwys te verbeter, het aanleiding gegee tot die relatief nuwe totale kwaliteitbestuur (TQM)-beweging by tersiere onderriginstellings soos universiteite en technikons. Die integrering van die totale kwaliteitverwante konsepte van strategiese TOM -intensie, eksterne omgewingsfaktore, bestuur se reaksie, kwaliteitstelseleffektiwiteit en deurlopende verbetering in 'n model, dui die gekombineerde gevolge van genoemde konsepte op die institusionele verbetering van technikons en • universiteite aan. Die belangrikste veranderlikes (binne bogenoemde dimensies van die model) wat vir institusionele verbetering by onderskeidelik universiteite en technikons verantwoordelik is, toon ooreenstemming - universiteite en technikons verskil egter ten opsigte van ander minder belangrike veranderlikes. Die funksionering van die model is soos volg: Die bestuur (akademies en administratief) van die tersiere onderriginstelling identifiseer en erken, onderhewig aan aspekte soos leierskap, kennis, ervaring, en aanvaarding, sekere eksterne omgewingsfaktore wat verband hou met die klientebehoeftes (ekstern en intern) en institusionele verbetering. Gegewe genoemde beperkings en faktore besluit bestuur op die (suboptimale) strategiese TQM-intensie om aan klientebehoeftes te voldoen. Die strategiese TQM-intensie sal nou saam met bestuur se reaksie (deur die toepassing van die TQM-beginsels en -filosofie) wat die effektiwiteit van die kwaliteitstelsel bepaal, bepaal op watter kwaliteitvlak die instelling sal opereer. Die kwaliteitstelsel bestaan uit die bestuur-, tegniese. en sosiale stelsel, en is weer eens I aan deurlopende verbetering onderhewig. (Die bestuurstelsel dien as integreerder van die ander twee stelsels.) Die eindresultaat van die toepassing van die TQMfilosofie en -beginsels is institusionele verbetering. Verder kan die model en die resultate van hierdie studie deur universiteite en technikons gebruik word by die verbetering/implementering van hulle eie, unieke totale kwaliteitimplementeringsmodel(le) - 'n uitgebreide implementeringsmodel is vir die rede voorgehou. Laastens kan die (verkorte) meetinstrumente wat vir universiteite en technikons onderskeidelik bepaal is, gebruik word om die sukses met die implementering van TQM by 'n individuele instelling te meet.; The necessity to improve productivity and quality in higher education has resulted in the relatively new movement of Total Qua~ity Management(TQM) at tertiary institutions such as universities and technikons. The integration of the total quality-related concepts of_ strategic TQM intent, external environmental factors, reaction of management, effectiveness of the quality system and continuous improvement in a model, can be used to indicate their combined results on the institutional improvement of technikons and universities. The most important variables (within the above-mentioned dimensions of the model) responsible for institutional improvement at universities and… Advisors/Committee Members: Van den Bergh, P. H. (Pieter Heinrich), 1940- (advisor).

Subjects/Keywords: Quality; Total quality (TQ); Total quality management (TQM); Total quality implementation (TQI) in (tertiary) education; Productivity; Efficiency; Effectiveness in (tertiary) education; Kwaliteit; Totale kwaliteit (TQ); Totale kwaliteitsbestuur (TQM); Totale kwaliteitimplementering (TQI) in (tersiere) Onderrig; Produktiwiteit; Doelmatigheid; Effektiwiteit in (tersiere) onderrig

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Van Der Watt, H. H. (1997). Die toepassing van totale kwaliteitsbestuur aan graadwaardige tersiêre onderriginstellings . (Doctoral Dissertation). University of South Africa. Retrieved from http://hdl.handle.net/10500/16288

Chicago Manual of Style (16th Edition):

Van Der Watt, Hendrik Herculas. “Die toepassing van totale kwaliteitsbestuur aan graadwaardige tersiêre onderriginstellings .” 1997. Doctoral Dissertation, University of South Africa. Accessed March 06, 2021. http://hdl.handle.net/10500/16288.

MLA Handbook (7th Edition):

Van Der Watt, Hendrik Herculas. “Die toepassing van totale kwaliteitsbestuur aan graadwaardige tersiêre onderriginstellings .” 1997. Web. 06 Mar 2021.

Vancouver:

Van Der Watt HH. Die toepassing van totale kwaliteitsbestuur aan graadwaardige tersiêre onderriginstellings . [Internet] [Doctoral dissertation]. University of South Africa; 1997. [cited 2021 Mar 06]. Available from: http://hdl.handle.net/10500/16288.

Council of Science Editors:

Van Der Watt HH. Die toepassing van totale kwaliteitsbestuur aan graadwaardige tersiêre onderriginstellings . [Doctoral Dissertation]. University of South Africa; 1997. Available from: http://hdl.handle.net/10500/16288

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