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Abstract: Zasnovana in izdelana je elektromehanska, demonstracijska, linearna enota. Za doseganje zahtevanega položaja je uporabljena linearna os, ki jo načeloma lahko premika tako koračni motor kot tudi servomotor. Poudarek je na uporabi koračnega motorja. Osrednji namen je enostavno in nazorno prikazati, kako na regulacijo vplivajo posamezni členi regulatorja, vrsta regulatorja, nastavljeni parametri ter izbran pogonski motor. Uporaba sistema je preprosta, saj je potrebno v uporabniški vmesnik le vnesti zahtevane podatke in linearno os pognati. Nato preko grafičnega vmesnika spremljamo obnašanje sistema ter delovanje regulatorja. Možno je tudi analizirati gibanje linearne osi ter primerjati odzive na spremembe vhodnih parametrov. Na ta način je mogoče testirati različne koncepte vodenja oziroma regulatorje do skrajnih meja zmogljivosti, ki jih dopušča uporabljeni motor. Pri tem pa ni bojazni, da bi prišlo do poškodovanja opreme.
Keywords: linearna enota, koračni motor, vodenje osi
Published in DKUM: 12.07.2017; Views: 1762; Downloads: 242
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Abstract: Targeted muscle reinnervation (TMR) is a surgical procedure used to redirect nerves originally controlling muscles of the amputated limb into remaining muscles above the amputation, to treat phantom limb pain and facilitate prosthetic control. While this procedure effectively establishes robust prosthetic control, there is little knowledge on the behavior and characteristics of the reinnervated motor units. In this study we compared the m. pectoralis of five TMR patients to nine able-bodied controls with respect to motor unit action potential (MUAP) characteristics. We recorded and decomposed high-density surface EMG signals into individual spike trains of motor unit action potentials. In the TMR patients the MUAP surface area normalized to the electrode grid surface (0.25 ± 0.17 and 0.81 ± 0.46, p < 0.001) and the MUAP duration (10.92 ± 3.89 ms and 14.03 ± 3.91 ms, p < 0.01) were smaller for the TMR group than for the controls. The mean MUAP amplitude (0.19 ± 0.11 mV and 0.14 ± 0.06 mV, p = 0.07) was not significantly different between the two groups. Finally, we observed that MUAP surface representation in TMR generally overlapped, and the surface occupied by motor units corresponding to only one motor task was on average smaller than 12% of the electrode surface. These results suggest that smaller MUAP surface areas in TMR patients do not necessarily facilitate prosthetic control due to a high degree of overlap between these areas, and a neural information—based control could lead to improved performance. Based on the results we also infer that the size of the motor units after reinnervation is influenced by the size of the innervating motor neuron.
Keywords: target muscle reinnervation, motor unit, controlling muscles
Published in DKUM: 19.06.2017; Views: 1639; Downloads: 395
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Abstract: The term of logistic customer service is defined as the abilities or skills to meet the customer's requirements and expectations, chiefly in terms of the time and place of deliveries, while using all available forms of logistic activity, including transport, storage, and the management of inventories, information and packages. As eac h of the logistic activities has an effect on the customer receiving right product or service, in its proper condition, in the correct time and space, and at reasonable costs, so seeking the proper service comes down to managing logistic activities in such a manner, as to achieve the essential level of customer satisfaction at the lowest possible costs. The identified elements of logistic customer service in an organization are placed on a specific level, as assessed from the perspective of the purchasers' expectations. Among various methods for measuring customer service level, or quality, which are described in the literature on the subject, the SERVQUAL is recognized as one of the most effective. The SERVQUAL method relies on measuring the differences th at exist between the quality, as perceived by a customer, and the quality demanded by that customer from a specific service. In order to determine the difference, both the customer's expectations for the service level, and their fulfilment by a specific or ganization need to be examined at the same time. The elements of logistic customer service of the Silesian Province's (region in southern Poland) commercial cargo motor transport enterprises under study are placed on a measurable level, as evaluated from t he perspective of the recipients of offered transport services. The measurement of the logistic customer service level, as found in the entities examined, was made using the SERVQUAL method. The survey questionnaire used in the study was constructed based on 22 logistic customer service determinants. Questionnaire forms were filled by 294 customers of 147 Silesian Province's commercial cargo motor transport enterprises examined, i.e. two customers of each enterprise. The article presents theoretical basis for the measurement of the logistic customer service level by the SERVQUAL method, description of acquiring the research material, analysis of examination results and conclusions.
Keywords: cargo motor transport company, level of logistic customer service, logistic customer service, SERVQUAL
Published in DKUM: 03.04.2017; Views: 1217; Downloads: 443
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Abstract: V magistrskem delu so zajeti izračuni stroškov in prihrankov ob morebitni menjavi obstoječih elektromotorjev v podjetju Talum d.d. z energetsko varčnimi elektromotorji razreda IE3. Opisani so razredi energetske učinkovitosti, izkoristek različnih prenosov, rezultati popisa elektromotorjev ter predlog elektromotorjev za zamenjavo in prihranki pri zamenjavi. Predstavljeni so rezultati laboratorijskih meritev izkoristka med neposredno priključenim asinhronskim motorjem in asinhronskim motorjem s frekvenčnim pretvornikom. Meritve so bile izvedene v laboratoriju za električne stroje Fakultete za elektrotehniko, računalništvo in informatiko Univerze v Mariboru. Rezultati meritev neposredno priključenega elektromotorja so primerjani z izračuni programskega orodja emLook. S programom emLook smo analizirali vpliv različnih vrst statorskih navitij in različne poševnosti palic kratkostične kletke na višje harmonske komponente polja zračne reže.
Keywords: energetska učinkovitost, asinhronski motor, frekvenčni pretvornik
Published in DKUM: 14.11.2016; Views: 1725; Downloads: 190
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Abstract: Diplomsko delo predstavlja regulacijo kota zasuka gredi elektrohidravličnega rotacijskega servosistema z uporabo sodobnega industrijskega krmilnika. Na začetku smo analizirali sistem. Opisali smo njegovo delovanje v obliki matematičnih diferencialnih enačb. Na podlagi teh enačb smo izdelali simulacijski model. Znotraj računalniške simulacije smo dodali regulator in izbrali njegove optimalne parametre. Na podlagi pridobljenih podatkov iz simulacije smo programirali krmilnik. Krmilnik smo povezali z elektrohidravličnim servosistemom in dodali osciloskop za opazovanje signalov iz merilnika. Izdelali smo delovni program in izvedli regulacijo sistema. V zaključku je bila izvedena primerjava rezultatov, pridobljenih z računalniško simulacijo z rezultati eksperimentov.
Keywords: regulacija kota zasuka, servohidravlika, aksialno batni motor
Published in DKUM: 20.10.2016; Views: 1488; Downloads: 91
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