Virtual environment in control and programming system for reconfigurable machining robot

Robotski obradni sustavi imaju značajnu ulogu u modernoj proizvodnji. Radom se predlaže primjena virtualnih robota za off-line programiranje. Prikazan je rekonfigurabilni robot za obradu, programiran u G-kôdu, koji se može izravno koristiti od strane programera i operatora CNC alatnih strojeva. Predmet istraživanja su petoosni i šestoosni roboti vertikalne zglobne konfiguracije koji mogu biti konfigurirani tako da emuliraju alatne strojeve s petoosnim vertikalnim i horizontalnim gibanjem glavnog vretena. Razmatrani obradni sustavi su podržani ekvivalentnim virtualnim robotima u CAD/CAM okruženju i sustavu upravljanja. U cilju demonstracije učinkovitosti predložene arhitekture, obrađeno je nekoliko probnih izradaka.Robotic machining systems play an important role in modern manufacturing. The paper proposes the application of virtual robots for off-line programming. The reconfigurable machining robot, programmed in G-code, which can be directly used by CNC machine tool programmers and operators, is presented. The subject of study are 5- and 6-DOF vertical articulated robots that can be configured to emulate vertical and horizontal 5-axis spindle tilting machine tools. The considered machining systems are supported by equivalent virtual robots in the CAD/CAM environment and control system. Several test workpieces were machined to demonstrate the effectiveness of the proposed architecture

MKE analiza sigurnosnog rama voćarskog traktora pri prevrtanju

This paper describes a design of the protective frame orchard tractors and tractor power up to 65kW for use in fruit production on sloping ground for mechanical harvesting (shaking) of stone fruits. Shown protective frame can be mounted on existing models of tractors, primarily domestic production. This paper presents an analysis of the stress state of the observed protective frame mode unwanted case overturning tractor. A common practice in the examination and approval of protective frames to be loaded twice the force of gravity of the tractor. Analysis of the protective frame was done using the software package SolidWorks gain and methods of FEM analysis. Ram is loaded with a horizontal and vertical force of 38,2 kN on the side and from above. The results obtained show a satisfactory security.U ovom radu prikazano je jedno konstruktivno rešenje sigurnosnog rama za voćarske traktore i traktore snage do 65 kW koji se koriste u voćarskoj proizvodnji na nagnutim terenima za mašinsko ubiranje (trešenje) koštičavog voća. Prikazani sigurnosni ram može se montirati na postojeće modele traktora, pre svega domaće proizvodnje. U radu je izvršena analiza naponskih stanja posmatranog sigurnosnog rama u režimu neželjenog slučaja prevrtanja traktora. Uobičajena praksa pri ispitivanju i homologaciji sigurnosnih ramova je da se opterete dvostruko većom silom od težine samog traktora. Analiza sigurnosnog rama vršena je pomoću softverskog paketa SolidWorks korišćenjem metode MKE analize. Ram je opterećen silom od 38,2 kN sa bočne strane i sa gornje strane. Dobijeni rezultati ispitivanja ukazuju na zadovoljavajuću bezbednost

Personalization of Search Results Representation of a Digital Library

The process of discovering appropriate resources in digital libraries within universities is important, as it can have a big effect on whether retrieved works are useful to the requester. The improvement of the user experience with the digital library of the University of Novi Sad dissertations (PHD UNS) through the personalization of search results representation is the aim of the research presented in this paper. There are three groups of PHD UNS digital library users: users from the academic community, users outside the academic community, and librarians who are in charge of entering dissertation data. Different types of textual and visual representations were analyzed, and representations which needed to be implemented for the groups of users of PHD UNS digital library were selected. After implementing these representations and putting them into operation in April 2017, the user interface was extended with functionality that allows users to select their desired style for representing search results using an additional module for storing message logs. The stored messages represent an explicit change in the results representation by individual users. Using these message logs and ELK technology stack, we analyzed user behavior patterns depending on the type of query, type of device, and search mode. The analysis has shown that the majority of users of the PHD UNS system prefer using the textual style of representation rather than the visual. Some users have changed the style of results representation several times and it is assumed that different types of information require a different representation style. Also, it has been established that the most frequent change to the visual results representation occurs after users perform a query which shows all the dissertations from a certain time period and which is taken from the advanced search mode; however, there is no correlation between this change and the client’s device used