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Fault Tree Analysis and Reliability Block Diagram
Published in Hamed Fazlollahtabar, Seyed Taghi Akhavan Niaki, Reliability Models of Complex Systems for Robots and Automation, 2017
Hamed Fazlollahtabar, Seyed Taghi Akhavan Niaki
The robot system under consideration consists of a drive unit, software control system, laser navigation system, safety system, attachments, batteries, brake system, steering system, and manual buttons. Among these subassemblies, the drive unit, usually a brushless DC electric motor, provides power for motion and operation. The laser navigation system, developed by Macleod and Chiarella (1993), is in essence a position measurement system to locate the robot. It comprises a rotating laser installed on the board of the robot and three beacons mounted along the border of the area to be covered. The safety system, with the aid of a laser detection system installed on the robot, is designed to avoid obstacles that could appear on the pathway. Attachments refer to those additional components that are used to assist in moving and carrying items, and batteries—usually the common lead–acid batteries—are used to supply power to the whole robot system.
Imaging System Components
Published in Harry E. Martz, Clint M. Logan, Daniel J. Schneberk, Peter J. Shull, X-Ray Imaging, 2016
Harry E. Martz, Clint M. Logan, Daniel J. Schneberk, Peter J. Shull
The choices for the type of and the control protocol for the stages are large, and some of the distinctions are not consequential for system performance but can impact scan time. For the most part, there are three types of motor operation: stepper motor, AC servomotor, and DC servomotor. A stepper motor or step motor or stepping motor is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can then be commanded to move and hold at one of these steps without any feedback sensor (an open-loop controller), as long as the motor is carefully sized to the application with respect to torque and speed. A servomotor is a rotary or linear actuator that allows for precise control of angular or linear position, velocity, and acceleration. It consists of a suitable motor coupled to a sensor for position feedback. It also requires a relatively sophisticated controller, often a dedicated module designed specifically for use with servomotors.
A conceptual design of a solar powered UAV and assessment for continental climate flight conditions
Published in International Journal of Green Energy, 2022
Irem Turk, Emre Ozbek, Selcuk Ekici, T. Hikmet Karakoc
UAVs obviously require less power in flight than an airliner. Brushless DC electric motor technology has been improved on performance and efficiency (Bolam, Vagapov, and Anuchin 2020). Electric motors and battery technology have been improved with high energy density electro-chemistries, such as Li-Po and Li-Ion (Kulova T 2020). UAVs have been used for various applications, such as surveillance, agriculture, road inspection, and mining throughout the world and are seen as reliable platforms (Outay, Mengash, and Adnan 2020; Park and Choi 2020; Radoglou-Grammatikis et al. 2020). The endurance of the UAV is a key performance parameter that increases operating time (Stahl, Roessler, and Hornung xxxx). For electric-powered UAVs, on-board energy generation is an important topic due to current limitations on energy storage technology (Papis et al. 2020). As one of the major on-board energy generation options, photovoltaic panels have been applied to UAVs of different categories (van Nguyen C, van Quyen T, Le AM, Truong LH, Nguyen MT. Advanced Hybrid Energy Harvesting Systems for Unmanned Ariel Vehicles (UAVs). Adv. sci. technol. eng. syst. j 2020).