Visar resultat 1 - 5 av 46 avhandlingar innehållade ordet vakuumteknik.
Sammanfattning : Electronic commerce (E-commerce) is one of the issues that are expected to influence the various logistics and supply chain processes/operations including: production, packaging, warehousing, transportation, etc. Consequently, the environmental implications of E-commerce are of concern and interest. LÄS MER
2. Condition-Based Maintenance: Selection and Improvement of a Cost-Effective Vibration-Based Maintenance Policy for Rolling element Bearings
Sammanfattning : Modern machinery is expensive and therefore must run at high availability and effectiveness which cannot be achieved without an effective maintenance policy. Condition monitoring, (CM), techniques can be utilised to reduce or arrest the rate of deterioration of a component so increasing operating life. LÄS MER
Sammanfattning : The thesis contains three papers that comprise studies of the dynamic behaviour of involute spur and helical gears, and one paper that describes a method to determine the influence of misalignment on the static helical gear tooth stress. In the first study, the influence of the contact ratio on the dynamic response of a spur gear was examined. LÄS MER
Sammanfattning : The activity of robust design of mechanical products and how it can be accomplished in pre-prototype design phases, is discussed in this thesis. It is advocated that to be fully efficient and effective optimization of product robustness should commence already in the conceptual design phase. LÄS MER
Sammanfattning : The overall purpose with this work is to investigate the bubbly flow in a aerated stirred tank using numerical simulations. Aerated stirred tanks are commonly used in chemical processes for producing for example insulin and antibiotics. LÄS MER