1. Vodenje in načrtovanje trajektorije 3D mehanizma za testiranje malih UWB radarskih sistemovMatic Robič, 2025, master's thesis Abstract: V magistrskem delu je predstavljeno načrtovanje trajektorije 3D mehanizma, namenjenega testiranju malih UWB radarskih sistemov. Opisana sta zasnova sistema in načrtovanje ravninske in krožne trajektorije v 2D ravnini. Sledi opis vključitve tretje prostostne stopnje, ki poskrbi za želeno orientacijo v posamezni točki 2D ravnine. Tako smo dosegli, da je bilo mogoče testno napravo na mehanizmu ves čas orientirati v želeno smer skozi celotno trajektorijo. Izdelan in predstavljen je tudi uporabniški vmesnik, namenjen vodenju sistema. Na koncu je predstavljeno še testiranje delovanja celotnega sistema.
Keywords: pozicionirni sistem, koračni motor, načrtovanje trajektorije, uporabniški vmesnik
Published in DKUM: 15.10.2025; Views: 0; Downloads: 7
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2. Konstruiranje CNC rezkalnega strojaMiha Ribič, 2025, master's thesis Abstract: V magistrski nalogi je predstavljena zasnova in konstrukcija CNC rezkalnega stroja za lastno uporabo. Osnovni cilj je bil razviti cenovno dostopen, a dovolj tog in natančen stroj za obdelavo različnih materialov, predvsem navadnega jekla ter občasno tudi nerjavnega jekla. V uvodnem delu je podan kratek pregled CNC rezkalnih strojev, njihovih značilnosti in področij uporabe. Sledi utemeljitev izbire ključnih komponent, kot so koračni motorji v zaprti zanki, visokofrekvenčno vreteno, kroglična vretena in linearna vodila glede na zahteve obdelave jekla in razmerje med zmogljivostjo in ceno. V zaključku je predstavljen proces 3D modeliranja konstrukcije v programu Creo 8 ter glavne konstrukcijske rešitve, ki zagotavljajo stabilnost in natančnost. Rezultat je tehnično utemeljena in praktično izvedljiva zasnova kompaktnega triosnega CNC rezkalnega stroja, prilagojenega delovanju v manjšem delavniškem okolju.
Keywords: CNC stroj, rezkanje, koračni motor, vreteno, kroglično vreteno, linearna vodila, 3D modeliranje, Creo
Published in DKUM: 15.10.2025; Views: 0; Downloads: 12
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3. The efficiency of manual editing of high-density surface electromyogram decomposition depends on the recorded muscle and contraction level but less on the operator’s experienceNina Murks, Jakob Škarabot, Matej Kramberger, Matjaž Divjak, Gašper Sedej, Tamara Valenčič, Christopher D. Connelly, Haydn Thomason, Aleš Holobar, 2025, original scientific article Abstract: We investigated the agreement and accuracy of manual editing of the high-density electromyogram (hdEMG) decomposition results by seven human operators with various experience levels. All operators edited the same automatically decomposed experimental hdEMG from the first dorsal interosseous (FDI), tibialis anterior (TA), vastus lateralis (VL), and biceps brachii (BB) muscles, and synthetic hdEMG from soleus (SO) and BB muscles at 10%, 30%, 50% and 70% of maximum voluntary contraction. On average, operators kept 13.7 ± 7.4 motor units (MUs) after editing and demonstrated relatively large disagreement in the calculated MU pulse trains (normalized root mean square difference) but relatively high agreement in the identified MU discharges. Inter-operator agreement positively correlated with the initial MU Pulse-to-Noise Ratio used as a quality measure of automatic MU identification, and negatively correlated with the muscle contraction level. Operators agreed more on the results of the simulated than experimental hdEMG. Among the experimental muscles tested, the greatest agreement was demonstrated for VL and the lowest for BB. We obtained similar results when comparing editing to the results of the most experienced operator and to ground truth in simulated cases: the greatest precision and sensitivity were demonstrated for VL, and the lowest for BB. The level of the operator’s experience had a significant impact on the editing of synthetic hdEMG and the detection of the first MU discharge, but not on the rate of agreement or editing time of experimental hdEMG.
Keywords: hdEMG, manual editing, decomposition results, human operators, motor unit, človeški operaterji
Published in DKUM: 14.10.2025; Views: 0; Downloads: 4
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4. Primerjava vodenja nizkonapetostnih trifaznih motoriev v razvojnem okolju NXPGašper Zupan, 2025, undergraduate thesis Abstract: Namen te diplomske naloge je bil raziskati principe delovanja sinhronega motorja s trajnimi magneti ter metode, s katerimi je mogoče takšne motorje voditi in primerjati različne pristope vodenja. Osredotočili smo se na zagon motorja in njegovo hitrostno regulacijo. Opisali smo razvito funkcionalno programsko opremo in algoritem, ki omogoča zagon in krmiljenje motorja z nastavljivo hitrostjo vrtenja, ter njegove teoretične osnove. Na koncu smo rezultate prikazali na zaslonu, ki služi kot uporabniški vmesnik, s čimer je demonstracijski model postal uporaben tudi za pedagoške namene. Preizkusili smo 6-koračni algoritem in koračni algoritem z vektorsko modulacijo.
Keywords: sinhroni motor, algoritem vodenja, hitrostna regulacija, vektorski način vodenja.
Published in DKUM: 09.10.2025; Views: 0; Downloads: 2
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5. Rotacijski manipulator za delovne stroje: zamenjava hidravličnega gonila s servo-elektromotornim pogonom : diplomsko deloSrečko Čakš, 2025, undergraduate thesis Abstract: V diplomski nalogi smo analizirali obstoječi hidravlični pogon rotacijskega manipulatorja,
pri katerem hidromotor MR 50 prek polžastega gonila ustvarja navor okrog 2300 Nm in
izhodno hitrost 10 in 15 obr/min. Ugotovili smo, da sistem dosega želeno zmogljivost,
vendar so energijski izkoristki nizki, vzdrževanje drago, natančno pozicioniranje pa
oteženo zaradi mehanskih zračnosti in odsotnosti povratne informacije. Z namenom
izboljšave smo zasnovali digitalni dvojček sistema v okolju SolidWorks Motion Analysis
in izvedli simulacijo togih teles, s katero smo potrdili izračunane navore ter ocenili
mehanske izgube. Na podlagi simulacij smo določili zahtevane parametre za zamenjavo
pogona in izbrali elektromotorno rešitev z motorji Parker GVM ter pripadajočimi
krmilniki serije MCF. Predlagana rešitev ohranja izhodni navor ≥ 2300 Nm, izboljša
energijsko učinkovitost in omogoča natančno elektronsko vodenje hitrosti in položaja. V
zaključku podajamo priporočila za izdelavo prototipa, eksperimentalno validacijo in
nadaljnje optimizacije sistema.
Keywords: rotacijski manipulator, zamenjava hidravlike, trifazni sinhronski motor
s trajnimi magneti, izkoristek pogona, digitalni dvojček
Published in DKUM: 02.10.2025; Views: 0; Downloads: 8
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6. Towards digital twinning of electrical motors – simulation modelsGoran Kurtović, Luka Živković, Tin Benšić, Željko Hederić, Marinko Stojkov, 2025, original scientific article Abstract: This paper presents a methodological framework for building a digital shadow of an induction motor based on standardised tests and a two‑axis (dq) simulation model. The tests were carried out according to IEEE Std 112 and IEC 60034‑2‑1. The parameters of the equivalent circuit were identified and entered into the model. Validation was performed by comparing the torque–speed and current–speed curves at 180 V and 220 V, while the nominal behaviour at 400 V was estimated using the model and voltage scaling. The model was then calibrated to reduce the discrepancy between the simulation and measurements, and the error was quantified using the root‑mean‑square error (RMSE) and mean absolute percentage error (MAPE). An automated load‑simulation setup that reproduces the torque test is also presented, enabling rapid evaluation of parameter influence. The results show a very good match in the current channel, with larger deviations in the prediction of characteristic torque points, indicating the limitations of linearised parameters and motivating nonlinear model extensions. The approach enables summarised reliable estimates at nominal voltage when direct measurements are not feasible.
Keywords: induction motor, digital shadow, standardised tests, dq model, torque test, automated load simulation, model calibration
Published in DKUM: 01.10.2025; Views: 0; Downloads: 2
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7. Motor efficiency in relation to body weight status and gender in preschool childrenMiran Muhič, 2024, original scientific article Abstract: Deficits in motor skills and function are associated with overweight and obesity in children. This study aimed to investigate the development of motor efficiency in 3-4-year-old children over seven months and to identify possible gender and body weight status differences in motor efficiency. In the study, there were 45 children (21 girls, 24 boys), the mean age of whom was 39 months. Analysis of the results of testing for differences in motor efficiency according to body weight status and movement components showed no statistically significant differences (p>0.05) between healthy weight and overweight children.
Keywords: motor efficiency, motor abilities, body weight status, preschool children
Published in DKUM: 29.07.2025; Views: 0; Downloads: 8
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8. Differences in students’ physical selfperception in PE classes according to gender and nutritional statusDonata Vidaković Samaržija, Lara Pavlić Karamatić, Jelena Alić, 2023, original scientific article Abstract: The purpose of the study was to examine the level of physical self-perception (PSP) in the Physical Education class, and to determine differences in dimensions of PSP according to gender and nutritional status. On a sample of 283 4th- and 8th-graders in primary school, an anonymous questionnaire was applied. Fourth-graders made higher assessments of their coordination, sport competences, strength, flexibility and endurance than 8th graders. Moreover, significant differences were obtained in certain dimensions of PSP with regard to gender and nutritional status. A low level of PSP may be an obstacle to physical activity. These results indicate that PSP decreases by age and by gender.
Keywords: individual perception, motor abilities, primary school, BMI, physical activity
Published in DKUM: 29.07.2025; Views: 0; Downloads: 1
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9. The effects of spinal manipulation on motor unit behaviorLucien Robinault, Aleš Holobar, Sylvain Crémoux, Usman Rashid, Imran Khan Niazi, Kelly Holt, Jimmy Lauber, Heidi Haavik, 2021, original scientific article Abstract: Over recent years, a growing body of research has highlighted the neural plastic effects of
spinal manipulation on the central nervous system. Recently, it has been shown that spinal manipulation improved outcomes, such as maximum voluntary force and limb joint position sense, reflecting
improved sensorimotor integration and processing. This study aimed to further evaluate how spinal
manipulation can alter neuromuscular activity. High density electromyography (HD sEMG) signals
from the tibialis anterior were recorded and decomposed in order to study motor unit changes in
14 subjects following spinal manipulation or a passive movement control session in a crossover study
design. Participants were asked to produce ankle dorsiflexion at two force levels, 5% and 10% of
maximum voluntary contraction (MVC), following two different patterns of force production (“ramp”
and “ramp and maintain”). A significant decrease in the conduction velocity (p = 0.01) was observed
during the “ramp and maintain” condition at 5% MVC after spinal manipulation. A decrease in
conduction velocity suggests that spinal manipulation alters motor unit recruitment patterns with an
increased recruitment of lower threshold, lower twitch torque motor units.
Keywords: high-density surface electromyography, chiropractic, electromyography decomposition, motor unit
Published in DKUM: 20.06.2025; Views: 0; Downloads: 6
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10. Evaluation of an integrated programme of physical exercise with nursey-aged children : impact on motor achievementsVilko Petrić, Lucija Kostadin, Mirela Peić, 2018, original scientific article Abstract: The aim was to determine if there is a possibility of conducting an integrated programme of physical exercise with nursery-aged children, as well as to evaluate its impact on their motor achievement. The sample consisted of nursery-aged children. The sample of variables comprises four tests for evaluating motor achievement based on the various movement structures that allow mastery of space, obstacles and resistance, as well as the manipulation of objects. The differences between the experimental and control groups were tested with Student’s t-test. The results show that these programmes yielded exceptional results with regard to motor achievement.
Keywords: children of an early age, integrated programme of physical exercise, comprehensive motor development
Published in DKUM: 04.06.2025; Views: 0; Downloads: 1
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