# ANNU Digital Library

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## Recent Submissions

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Graduation Project Submitted in Partial Fulfillment of The Requirements for The Degrees of B.Sc. In Mechatronics & Mechanical Engineering
(2023) Ismaeel Sbeih; Yazan Jawwabreh
Robotic exoskeleton systems are one of the hottest subjects in robotic research right now. These systems have undergone extensive development in order to be used in the assessment of human power and robotic rehabilitation. Unlike industrial robots, robotic exoskeleton systems require unique consideration in terms of mechanical and control approaches since they interface directly with humans. Moving ranges, safety, comfort wearing, low inertia, and adaptability should all be taken into account while designing these systems mechanically. The controllers of exoskeleton systems should prioritize controllability, responsiveness, flexible and smooth motion generation, and safety. In addition, the controller should generate motions that are consistent with the human motion goal. The purpose of this report is to provide an overview of exoskeleton systems and design an exoskeleton that provides support when lifting a load so that the human body is not affected by any injury during work. The design will be tested on a load of 70 kg and using different types of materials, type of control for motors and sensors. A prototype arm of the exoskeleton was made and how to transfer movement from the user to the exoskeleton was studied by studying several sensors, but a flex sensor was chosen to transmit movement, but we noticed that there were several problems during work, including that the sensor was poorly made and did not give correct readings, so we resorted to using potentiometer.
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Assessment and Potential of using Passivated Emitter and rear cell (PERC) in Palestine
Palestine has witnessed a great spread in the adaptation of photovoltaic power systems, as it has become an alternative source of energy provider for various applications, due to the low prices of photovoltaic energy. The Palestinian territories are supplied with electricity from neighboring countries, which increases and burdens the Palestinian economy in terms of security in particular. This project presents a 12-month economic and technical evaluation for the year 2021 for an already existing photovoltaic system project located on the rooftop of the Siniora factory building for food products in Jerusalem, connected to the grid with a capacity of 117 KW. The evaluation was carried out by comparing the technical and economic results of the simulated data through the PVsyst program with the real data acquired from the system real outputs, the performance ratio and the present value of the simulated photovoltaic system were 82% and $133,904, respectively, in contrast. The real data was 62% and$111,614 respectively. The main reason for the clear difference between the data is the losses that the PVsyst program does not take precisely because it works on the standard conditions, in contrast to the real data, which takes into account all conditions, including temperatures, solar radiation, and others.