Hibridni sustav daljinskog upravljanja lebdjelicom

This article presents one solution to a quadrotor control problem that is based on a discrete automaton. This automaton combines classical PID and more sophisticated LQ controllers to create a hybrid control system. This closed loop control concept is expanded with an open loop controller that enables the aircraft to perform aggressive flying maneuvers. The combination of open and closed loop controllers builds a hybrid controller concept that allows directed and autonomous flying of the quadrotor aerial vehicle. Proposed control concept was tested on an elaborate mathematical model. The article discusses these test results and presents the means to develop such a controller.U radu je opisan hibridni upravljački koncept bespilotne letjelice pogonjene s četiri rotora, koji objedinjuje klasične PID regulatore i naprednije LQ regulatore primjenom Mooreova automata. Takav je hibridni koncept upravljanja u zatvorenoj petlji nadograđen upravljanjem u otvorenoj petlji koje omogućuje ostvarenje agresivnih letačkih manevara. Osim toga, kombinacija upravljanja u otvorenoj I zatvorenoj petlji omogućuje i daljinsko upravljanje letjelicom zasnovano na vizualnoj povratnoj vezi. Predloženi sustav upravljanja letjelicom testiran je na iscrpnom matematičkom modelu letjelice

Grabbing power line conductors based on the measurements of the magnetic field strength

This paper presents the method for the localization and grabbing of the long straight conductor based only on the magnetic field generated by the alternating current flowing through the conductor. The method uses two magnetometers mounted on the robot arm end-effector for localization. This location is then used to determine needed robot movement in order to grab the conductor. The method was tested in the laboratory conditions using the Schunk LWA 4P 6-axis robot arm.Comment: 2021 Aerial Robotic Systems Physically Interacting with the Environment (AIRPHARO). arXiv admin note: text overlap with arXiv:2206.0916

Towards Intuitive HMI for UAV Control

In the last decade, UAVs have become a widely used technology. As they are used by both professionals and amateurs, there is a need to explore different control modalities to make control intuitive and easier, especially for new users. In this work, we compared the most widely used joystick control with a custom human pose control. We used human pose estimation and arm movements to send UAV commands in the same way that operators use their fingers to send joystick commands. Experiments were conducted in a simulation environment with first-person visual feedback. Participants had to traverse the same maze with joystick and human pose control. Participants' subjective experience was assessed using the raw NASA Task Load Index.Comment: 2022 International Conference on Smart Systems and Technologies (SST

Application of UAVs for assessment of bridge infrastructure

Nedostatci klasičnih metoda pregleda građevina prometne infrastrukture doveli su do razvoja učinkovitijih, pouzdanijih, bržih i jeftinijih postupaka za ocjenu stanja te procjenu nosivosti i uporabnog vijeka građevina. U tom kontekstu, najistaknutiju ulogu imaju različiti autonomni sustavi razvijeni u posljednjih desetak godina, čiji se napredak neprestano ubrzava. U radu je dan pregled stanja područja upotrebe bespilotnih letjelica za pregled konstrukcija s naglaskom na preglede mostova. Rad uključuje sljedeće: prikaz aktualne zakonske regulative koja propisuje tipove i učestalost izvođenja pregleda; osvrt na trenutačno zastupljene klasične metode pregleda te njihove prednosti i nedostatke; analizu prednosti i nedostataka upotrebe bespilotnih letjelica za preglede mostova te pregled opreme koja se najčešće koristi prilikom njihova razvoja.The shortcomings of classical methods for inspection of transport infrastructure objects have led to the development of more efficient, more reliable, faster and cheaper procedures for condition assessment and load-bearing capacity and service life estimation of objects. In this context, different autonomous systems developed in the last decade have the most notable role and their development is continuously speeding up. This paper provides a state of the art review of the unmanned aerial vehicles application for structural inspection with a focus on bridges. The paper comprises the following: a review of the current regulations prescribing the types and frequency of inspections; a review of the current classical inspection methods with their advantages and disadvantages; analysis of advantages and disadvantages in application of unmanned aerial vehicles for bridge inspections and a review of the equipment commonly used in their development

Laboratorij za robotiku i inteligentne sustave upravljanja LARICS

U ovom radu predstavljen je Laboratorij za robotiku i inteligentne sustaveupravljanja (LARICS) Fakulteta elektrotehnike i računarstva Sveučilišta u Zagrebu

Development of an autonomous system for assessment and prediction of structural integrity

Kako bi se osiguralo racionalnije, plansko održavanje prometne infrastrukture uz smanjenje troškova te u konačnici minimalizirao rizik od katastrofalnih posljedica, nužan je razvoj inovativnih rješenja u području održavanja građevina prometne infrastrukture. Kroz projekt ASAP razvija se sustav za autonomni pregled građevina, koji se zasniva na naprednim mjernim metodama integriranim na robota penjača i bespilotnu letjelicu. Cilj ovog rada je dati osvrt i upozoriti na nedostatke konvencionalnog načina ispitivanja materijala i konstrukcija za potrebu ocjene stanja, koji su bili osnovna motivacija okupljanja multidisciplinarnog tima kroz projekt ASAP. U radu su također prikazane mogućnosti i izazovi razvoja autonomnog sustava za pregled građevina, a sve u svrhu povećanja pouzdanosti i efikasnosti sustavnog pregleda građevina.Development of innovative solutions for the maintenance of transport infrastructure facilities is needed in order to ensure a more rational, planned and lower-cost maintenance of transport infrastructure, and to ultimately minimise the risk of catastrophic consequences. A system for an autonomous inspection of structures, based on advanced measuring methods integrated on a wall-climbing robot and an unmanned aerial vehicle, is currently developed in the scope of the ASAP project. The objective of this paper is to provide an overview and draw attention to disadvantages of conventional methods for testing materials and structures in order to assess their condition. This objective was the main motivation for forming a multidisciplinary team through the ASAP project. Possibilities and challenges in the development of an autonomous structural-assessment system are also presented in the paper, with the purpose of increasing the reliability and efficiency of systemic assessment of structures

Safe local aerial manipulation for the installation of devices on power lines: Aerial-core first year results and designs

Article number 6220The power grid is an essential infrastructure in any country, comprising thousands of kilometers of power lines that require periodic inspection and maintenance, carried out nowadays by human operators in risky conditions. To increase safety and reduce time and cost with respect to conventional solutions involving manned helicopters and heavy vehicles, the AERIAL-CORE project proposes the development of aerial robots capable of performing aerial manipulation operations to assist human operators in power lines inspection and maintenance, allowing the installation of devices, such as bird flight diverters or electrical spacers, and the fast delivery and retrieval of tools. This manuscript describes the goals and functionalities to be developed for safe local aerial manipulation, presenting the preliminary designs and experimental results obtained in the first year of the project.European Union (UE). H2020 871479Ministerio de Ciencia, Innovación y Universidades de España FPI 201