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1.
Optimal kinematic design of a link-drive mechanism with prescribed velocity characteristics
Bojan Vohar, Karl Gotlih, Jože Flašker, 2003, kratki znanstveni prispevek

Opis: The paper presents an example of a link-drive mechanism for a deep drawing mechanical press. Because of its characteristics such a drive is much more appropriate than conventional crankshaft or eccentric drive. The existing design of the drive has proved unsatisfactory and does not meet all the demands and constraints, which are ideal for deep drawing process. Optimization of the drive is therefore necessary. The intention is to achieve the required velocity characteristics in a defined area of movement. Firstly, the drive is analyzed and a mathematical model is made and prepared for optimization procedure. The process is time-dependent, so it cannot be used directly in the optimization algorithm. Mathematical model is transformed intoa form suitable for the standard non-linear optimization procedure and then optimization is carried out. The method used is sequential quadratic programming. The final objective of the optimization process is to find such dimensions of link-drive members that the given requirements are satisfied in the best possible manner.
Ključne besede: mechanics, dynamics of mechanical systems, closed kinematic chains, mathematical modelling, non-linear optimization, drive optimization, drive dimensioning, kinematic analysis, link-drive mechanism, deep drawing press
Objavljeno: 01.06.2012; Ogledov: 1517; Prenosov: 90
URL Povezava na celotno besedilo

2.
Calculation model for pre-stressed bolted joints of slewing bearings
Péter Göncz, Srečko Glodež, 2009, izvirni znanstveni članek

Opis: The presented paper describes a calculation model for pre-stressed bolted joints used to connect slewing bearings to the adjacent structures. A classical pre-stressed bolted joint calculation model is described and its insufficiencies for direct application on slewing bearings are pointed out. Finally, the suggested stress analysis is done by modelling the most loaded single bolt segment of the slewing bearing assembly, applying the preload and the working load on it. The stress determination in the bolt is done by finite element analysis.
Ključne besede: preiskava materialov, vijačne zveze, aksialni ležaji, dimenzioniranje, matematični modeli, materials testing, bolted joints, slewing bearings, dimensioning, calculation models
Objavljeno: 10.07.2015; Ogledov: 892; Prenosov: 24
URL Povezava na celotno besedilo

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