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Prototyping and Modeling of a Temperature Controlled Sleeping Surface in a Child Pram
KTH, School of Industrial Engineering and Management (ITM).
KTH, School of Industrial Engineering and Management (ITM).
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Accurate temperature control is important for various applications and products. This would also be the case in an electrically heated child pram, since children are vulnerable to both cold and warm environments. There will be high demands that a heated/cooled child pram maintains stable temperatures on the sleeping surface.

The purpose of this thesis is to explore the feasibility of model-based control design for an electrically heated child pram. To realize this, a prototype is developed as well as a thermodynamic model of the child pram's sleeping surface. Finally, a temperature controller is proposed and later implemented on the real plant, using PI tuner on the thermodynamic model.

A white-box modeling approach is selected to construct a model of the heat system. The model is developed in MATLAB Simulink/Simscape environment. Based on measured data from system testing, Simulink Design Optimization Tool is employed to estimate and verify some important parameters of the developed model. Consequently, a grey-box model of improved accuracy is generated, which is then used for controller design. The controller is tested and refined in simulation environment, before being implemented on the prototype. After this, its performance is validated against the simulated controller as well as the initial system requirements.

The proposed controller shows high equivalence in simulation and in practise. It also meets thedesign specifications for this specific temperature controlled child pram. The results show that model-based design is a suitable method to develop temperature controllers for an electrically heated child pram. This thesis also highlights how to improve the accuracy of a white-box model, which plays a significant role in controller design.

Abstract [sv]

Noggrann temperaturreglering har stor betydelse för olika applikationer och produkter. Detta gäller till exempel för en eluppvärmd barnvagn, eftersom barn är känsliga mot både kalla- och varma temperaturer. Det är därför viktigt att en temperaturreglerad barnvagn kan hålla en stabil yttemperatur.

Syftet med det här arbetet är att utveckla en prototyp och en termodynamisk modell av en elektriskt uppvärmd barnvagn. Med hjälp av modellen ska temperaturregulatorer designas. Forskningen i arbetet gör gällande att utvärdera modell-baserad temperaturreglering av ett sådant system.

En "white-box model"-ansats är vald och modellen utvecklas i MATLAB Simulink/Simscape. Modellens noggrannhet förbättras genom att använda uppmätta data i Simulink Design Optimization toolbox för att estimera utvalda parametrar. Den slutliga modellen är därför en "grey-box model". Modellen används sedan för att utveckla temperaturreglering för systemet.

Regulatorn implementeras på prototypen och utvärderas mot den simulerade regulatorn samt de ursprungliga kraven på systemet. Den utvecklade regulatorn visar hög ekvivalens mellan simulerade- och uppmätta tester på prototypen. Regulatorn motsvarar de härledda reglerkraven. Resultatet visar att modell-baserad design är en rimlig metod för att utveckla temperaturreglering åt en eluppvärmd barnvagn. Arbetet visar även på hur man kan förbättra noggrannheten på modellen genom att tillämpa uppmätta data från prototyptester.

Place, publisher, year, edition, pages
2019. , p. 99
Series
TRITA-ITM-EX ; 2019-131
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-262492OAI: oai:DiVA.org:kth-262492DiVA, id: diva2:1361439
External cooperation
Emmaljunga Barnvagnsfabrik
Supervisors
Examiners
Available from: 2019-10-17 Created: 2019-10-16 Last updated: 2019-10-17Bibliographically approved

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