Sinteza upravljačkog algoritma za antenu za praćenje satelita u niskozemnoj orbiti

master's thesis

• Title (english): Synthesis of control algorithm for LEO satellite tracking antenna
• Author: Mario Bosnar
• Mentor: Zdravko Terze (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2019-12-05, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; General Mechanical Engineering (Construction)

Abstract

Ovaj rad prezentira osmišljavanje osnovnog modela upravljanja i regulacije antenom za
satelitsku komunikaciju. Idejni model integriran je u software MSC Adams koji se upotrebljava
za izračun dinamike sustava. U radu je primijenjen 3D model antene sa svim inercijskim
značajkama, napravljen prema geometrijskim i inercijskim izmjerama realne antene. Poradi što
vjerodostojnije simulacije izrađen je osnovni simulacijski model elektromotora. Mogućnost
sprega simulacije između Matlab Simulink-a i Adams-a iskorištena je da bi se došlo do što
točnijih rezultata. Pri tome MSC Adams računa dinamiku sustava, a Simulink obavlja
upravljačke funkcije. Ispitana je stabilnost regulatora i konačna dobivena točnost pri
nastrujavanju vjetra određene brzine. Koristi se PID regulacija iz razloga jer se radi o sporim
gibanjima jednostavnog sustava. Integriran je matematički algoritam za usklađivanje brzine
rotacije satelita čime su poništeni nagli skokovi izlaznog momenta aktuatora u početnom
trenutku praćenja satelita. Dobiveni rezultati zadovoljavaju traženu točnost što pokazuju kutna
odstupanja manja od 0,1° (stupanj). U radu su dotaknuti mnogi problemi kao što je modeliranje
sile vjetra, podešavanje pojačanja regulatora, opterećenje zglobnih ležajeva, generiranje realne
putanje satelita i nužnih kutova orijentacije antene i slično, koji traže dodatna istraživanja i
rješenja. U zaključku se analiziraju dobiveni rezultati, iznose napomene s ciljem poboljšanja
sustava i prikazuju moguće mane ovog modela.

Abstract (english)

This paper presents the design of a basic model of antenna control and regulation for
satellite communication. The conceptual model is integrated into MSC Adams software and
used to calculate system dynamics. The 3D model of antenna, made from geometric dimensions
of a real antenna, with all inertial features, was applied in this paper. For the sake of credible
simulation, the basic simulation model of an electric motor was created. The possibility of joint
simulation of Matlab Simulink and Adams was used to obtain as accurate results as possible. In
doing so, MSC Adams calculates system dynamics, and Simulink performs control functions.
The stability of the controller and the final accuracy obtained with wind gusts of a certain speed
were tested. PID regulation is used as this is a simple system with slow motions. A mathematical
algorithm for synchronizing the rotation speed of satellites has been integrated, which
eliminates sudden jumps of actuator output at the initial moment of satellite tracking. The
obtained results satisfy the required accuracy, angular deviations less than 0,1° (degree). The
paper touches on many problems such as modeling of wind force, adjusting the gain of the
controller, load of the articulated bearings, generation of realistic satellite path and necessary
antenna orientation angles, etc., which require additional research and solutions. In conclusion,
the results obtained are analyzed, notes are made to improve the system and the possible
disadvantages of this model are presented.

• Keywords: Antena za komunikaciju sa satelitom; LEO satelit; PID regulator; MSC Adams; spreg simulacija; Matlab Simulink
• Keywords (english): Satellite communication antenna; LEO satellite; PID regulation; MSC Adams; co-simulation; Matlab Simulink
• Language: croatian
• URN:NBN: urn:nbn:hr:235:725915
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-11-25 14:13:21