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Muscle to motor communication
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The purpose of this study is to examine the parameters influencing the signal to noise ratio in surface electromyography as well as the signals usability as a means of control in mechatronical applications. Electromyography refers to the electrical signals detected in the muscles during activation. Receiving a reliable signal presents a number of challenges as the signals are to their nature very weak. There is also a large amount of ambient noise which will drown the signal if left unprocessed. Removal of the noise was performed by using a series of amplifiers and filters to gradually increase the signal to noise ratio. The processed signal was forwarded to a microcontroller for posttreatment, calculation and presentation. A demonstrator was built in order to underline the validity of the theory presented in the report.

The project resulted in a fully functional circuit for registering sEMG-signals and forwarding them to an Arduino microcontroller. The signal to noise ratio was satisfactory given the scope of the project. The motor-control using the signal as reference was also successfully performed. In sum, this points towards that sEMG is a strong option for a control signal in mechatronical applications already at a small-scale level of integration.

Abstract [sv]

Syftet med denna studie är att undersöka de parametrar som påverkar signal-brusförhållandet i ytelektromyografi samt signalens användbarhet som styrsignal i mekatroniska system. Elektromyografi syftar på de elektriska signaler som uppstår i musklerna när dessa befinner sig i aktivt tillstånd. Att registrera en tillförlitlig signal är i sig en utmaning då signalerna till sin natur är mycket små. Därtill förekommer en stor mängd störningar i omgivningen som tenderar att dränka den önskade informationen i signalen om de lämnas obehandlade. Filtrering av störningarna utfördes genom att signalen skickades genom en serie av förstärkare och filter för att förbättra signal-brusförhållandet. Därefter vidarebefordrades den förbehandlade signalen till en mikrokontroller för efterbehandling, beräkningar och presentation. En prototyp byggdes för att styrka validiteten i den teori som presenteras i rapporten.

Projektet resulterade i en fullt fungerande krets för insamling och analys av sEMG-signaler med fokus på den utvalda muskeln. Även motorkontroll genomfördes med lyckat resultat med EMG-signalen som styrsignal. Detta visar på att sEMG som metod för att generera styrsignal i mekatroniska applikationer är fullt genomförbart, även på mindre skala.

Place, publisher, year, edition, pages
2015. , 50 p.
Series
MMKB 2015:11 MDAB 064
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-192928OAI: oai:DiVA.org:kth-192928DiVA: diva2:973848
Supervisors
Examiners
Available from: 2016-09-23 Created: 2016-09-23 Last updated: 2016-09-23Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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