Mechanical and Aerospace Engineering

Permanent URI for this collection

https://hdl.handle.net/20.500.14540/17055

Browse

Recent Submissions

Now showing 1 - 20 of 57
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
    Modeling Electrochemical Corrosion in Magnesium Alloy Using Non-linear Phase Field Methods
    (I.O.E, 2025-04) Shah, Saroj Kumar; Poudel, Laxman
  • Thumbnail Image
    Item
    Hydrodynamic Forces and their Effects on Structural Design of Vertical Lift Gate
    (I.O.E, 2025-04) Twayna, Ranjeet; Poudel, Laxman
  • Thumbnail Image
    Item
    Technical Assessment of Biomass-based Industrial Boilers of Nepal
    (I.O.E, 2025-04) KC, Nirmal; Darlami, Hari Bahadur
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
    Free Vibration Analysis of Circular Tapered Cantilever Microbeams
    (I.O.E, 2025-04) Saud, Dhan Bahadur; Luitel, Mahesh Chandra
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
    Fault Identification in Mechanical Components and Performance Analysis of PROR Hydropower Plants of Nepal Electricity Authority
    (I.O.E, 2025-04) Baral, Karuna Devi; Poudel, Laxman
    One of the main reasons of power cuts is the outage in power plants due to various problems in electro-mechanical components along with civil structure. This report focuses on the reason of power outage due to mechanical problems in powerhouse. The frequent problems in mechanical components were identified in selected hydropower which are Kali Gandaki Hydropower Plant, Middle Marsyangdi Hydro Power Plant and Marsyangdi Hydro Power Plant and found that the desander and the water-cooling system encountered the problems more frequently. This report calculates the outage hours due to maintenance and due to unexpected problems and makes a financial evaluation of the loss occurred in the last four fiscal years along with the performance analysis. The availability of these plants ranges from 70-85% and the reliability is found to be more than 98%. The average plant factor ranges from 68-73% with MHPP at highest (72.13%). The average capacity factor ranges from 93- 110% with MMHPP at highest (109.20%). Similarly, the average performance factor of the plant ranges from 92-98% with KGAHPP at highest (97.52%). Moreover, the generation cost per unit electricity is also calculated from the collected data.
  • Thumbnail Image
    Item
    Impact Analysis of Marsyangdi Corridor 220kV Transmission Line on the Operation of Integrated Nepal Power System
    (I.O.E, 2025-04) Sapkota, Gaurav; Bhattarai, Nawraj
    Despite having an enormous hydropower potential and being one of the early adopters of hydropower as a source of energy, Nepal has not been able to make significant strides in this sector. Since most of the hydropower generating station are located in central hilly regions and majority of load centre are location in Terai region of Nepal, the transportation of power remains a huge challenge in Nepal. Additionally, there is significant power loss in the power system itself. Currently, Nepal is focusing on developing high voltage transmission line to evacuate the power as well as decrease the existing loss in the system. Marsyangdi Corridor 220kV Transmission Line Project (MCTLP) is a project that aims to develop 113 km of double circuit line from Dharapani in Manang to Aaptari in Chitwan to evacuate the power produces in Marsyangdi river basin and its tributaries. The construction of this high voltage line is expected to significantly ease the burden on current Middle Marsyangdi-Markichowk and Damauli-Bharatpur transmission line along with decreasing the overall loss in the system.
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
    Modal Analysis of Multi-Disk Rotor System
    (I.O.E, 2024-06) Pradhan, Sunil; Luitel, Mahesh Chandra
    Controlling Vibration Is essential for the safe and efficient operation of rotating machinery in industries such as aerospace, automotive and power generation. This study focuses on the model behavior of multi-disk rotor system, a critical area in mechanical engineering.
  • Thumbnail Image
    Item
    Analysis of Patient Flow Using Discrete Event Simulation for An Emergency Room: A Case Study of Bhim Hospital Rupandehi, Nepal
    (I.O.E, 2024-06) Khanal, Sudin; Maharjan, Sanjeev
    The Emergency Room experiences a daily influx of patients, putting significant strain on departmental resources. Concurrently, treatment duration for patients has risen, leading to dissatisfaction and prolonged wait times. Hospital management is exerting maximum effort within existing resources to mitigate these issues, with a primary focus on reducing wait times. To address these challenges, a Discrete Event Simulation is employed to simulate real-world scenarios and identify optimal solutions for reducing length of stay, wait times, and other contributing factors, thus bolstering the foundation for robust decision-making. Bhim Hospital's Emergency Room serves as the case study, assessing wait times, length of stay, and bed utilization. Experimental scenarios are applied to the model, aiding the hospital management team in decision-making processes. Selection and rejection of strategies are based on paired test analyses, comparing real-world hospital data with results generated by the simulation model. Given the feasibility of all scenarios in decreasing length of stay, and bed occupancy rates, the results are recommended to the hospital for implementation. The time to stay for Red zone, Green zone and Yellow zone patients is 6 hours according to hospital data and simulation suggest of 3,4 and 5 hours respectively, this also suggest on decreasing of length of stay in the hospital
  • Thumbnail Image
    Item
    Performance Analysis of Solar PV System installed in Chitwan Medical College
    (I.O.E, 2024-06) TIMILSINA, NISHAN; Bhattarai, Nawaraj
    In various places of the world grid-connected and off-grid rooftop solar PV systems have been installed, either to export energy to the grid or to reduce electricity bills in an industry, hospitals, etc. A 201.96 kWp solar PV plant with 7, identical 25 KW offgrid inverters was installed in the Chitwan Medical College, Chitwan. The plan of the study was to carry out the performance analysis of installed multi-crystalline solar panels for a period of one year and to evaluate the results with the results simulated in the PVsyst. The generation data has been extracted using the Wattmon Cloud Portal. The main aim of this work was to evaluate and determine various performance characteristics of an already-existent solar system that has been installed at Chitwan Medical College, Chitwan. It was found that annual energy generation of 236.99 MWh, Performance ratio was 79.80 %, Capacity Utilization Factor 13.58%, and specific Yield was 1173.24 kWh per kWp per Year. The difference between the actual and simulated generation (54.30 MWh) suggests there may be factors impacting the system's performance. These could include equipment inefficiencies, shading, maintenance issues, or inaccuracies in the simulation model used.
  • Thumbnail Image
    Item
    Design Simulation and Experimental Verification of Optimized Savonius Wind Turbine Profile
    (I.O.E, 2024-06) Paudel, Anuj; Shrestha, Rajendra
    Nepal possesses significant hydropower potential but has not fully harnessed this resource, leading to limited power production capacity. To bridge the gap between energy demand and generation, Nepal can leverage wind energy, which can produce up to 3000 MW, with 448 MW readily and commercially exploitable. Historically, Nepal has focused on horizontal axis wind turbines (HAWTs), with minimal exploration of vertical axis wind turbines (VAWTs). VAWTs offer several advantages over HAWTs, such as lower mounting height, omni-directional capability, and efficiency at low wind speeds. The Savonius wind turbine was selected for its simple design and effective performance in low wind speeds and turbulent airflow. The report details the design process, including material selection, dimensions, and assembly process, with the use of SOLIDWORKS 17. A model was simulated, fabricated, and tested to obtain experimental data. The maximum rotational speed, torque and angular velocity generated were experimentally determined to be 266 rpm, 0.305 Nm and 27.841 ω, respectively, at wind velocities of 6.3 m/s.
  • Thumbnail Image
    Item
    MODEL PREDICTIVE CONTROL-BASED OPTIMAL TRAJECTORY TRACKING IN AUTONOMOUS QUADROTOR SYSTEM
    (I.O.E, 2024-03) Simkhada, Dipesh; Bhatta, Hemant; Karki, Krishna Bahadur; Thapa, Prasanna Pratap; Luitel, Mahesh Chandra
    Optimal trajectory tracking through nonlinear optimization is a computational process that aims to track the reference path for a system, considering the dynamics and objectives of system along with the constraints that are provided. Among current approaches in trajectory tracking formulation as an optimization problem, this paper describes Model Predictive Control( MPC), an approach that provides a continually evolving optimized trajectory tracking system that also respects system dynamics and constraints. The project showcases both the numerical simulation for the MPC implemented for reference trajectory tracking followed by an implementation on the actual quadcopter. However, in the actual hardware implementation flight test have been conducted in the quadrotor where only the attitude has been controlled in the PX4 firmware directly using Model Predictive Control. In this paper, the MPC-based control technique is used for trajectory tracking of the quadrotor model in different types of trajectories. For numerical simulation, non linear model has been developed and analyzed using the Finite-length time horizon control referred to as Model Predictive Control whereas, for SITL(Software-in-The-Loop) simulation, linear model of MPC have been used. For the flight test, to achieve efficient computational cost for the Pixhawk Flight Controller, the linear model has been implemented to analyze the attitude control shown by the quadrotor system.
  • Thumbnail Image
    Item
    Experimental Analysis on Vapour Compression Refrigeration System
    (I.O.E, 2024-04) Shrestha, Jeena; Thapa, Niraj; Pradhan, Rejisha; Baniya, Sujit Sah; Amatya, Vishwo Prasad
    Vapour Compression Refrigeration system (VCRs) has been extensively used in Refrigeration and HVAC sectors due to its beneficial characteristics like higher COP and Refrigerating Effect. However, these sectors and consequently VCRs contribute to a substantial and rapidly increasing global energy consumption which has raised huge concerns. This project aimed to experimentally analyse the vapour compression refrigeration system and compare performance of the system with and without heat addition. It was conducted by fabricating a VCR unit and adding extra heat to the unit before and after the compression process. The COP of the system increased by 46.07% when heat was added before compressor while the current consumption of the compressor decreased by 12.07%. However, COP of the system decreased by 22.7% when heat was added to the system after compressor with 32.6% increase in current consumption.
  • Thumbnail Image
    Item
    NUMERICAL SIMULATION OF HYPERSONIC FLUID-STRUCTURE INTERACTION ON CANTILEVER PLATE WITH OSCILLATING SHOCK IMPINGEMENT
    (I.O.E, 2024-03) Paudel, Prabin; Shahi, Sanskar Chandra; Pandey, Sarthak; Kharel, Sashakta; Bhattarai, Sudip
    When an entity surpasses the velocity of sound, it undergoes a process where it compresses the air molecules preceding it, resulting in the formation of a region characterized by heightened pressure called a shock wave. When this shock wave encounters a physical framework, the framework becomes exposed to a load of pressure, potentially leading to structural deformation. These scenarios, wherein the interaction between a fluid medium and structures is involved, are effectively tackled through the discipline of fluid-structure interaction (FSI). In the case of hypersonic vehicles, shock waves impact the structures of control surfaces, thereby instigating fluid-structure interaction within said structures. The scope of this study is to carry out a numerical simulation of Hypersonic Fluid-Structure Interaction on a Cantilever plate with oscillating shock impingement location using the UNSW Canberra’s HyMAX benchmark test case. The numerical simulation is carried out in two approaches i.e. Low Fidelity Modeling (LFM) and High Fidelity Modeling (HFM). In LFM, the problem is modeled based on shockwave Expansion Theory , Piston Theory and Euler Bernoulli Model. Whereas in HFM, the problem is solved by coupling a fluid solver, OpenFOAM, with a structural solver, CalculiX, via a coupling library, preCICE. The shock-generating wedge was given a predefined oscillating rotating motion with a frequency of 42 Hz.
  • Thumbnail Image
    Item
    DEVELOPMENT AND TESTING OF AUTONOMOUS MOBILE ROBOT FOR MATERIAL HANDLING
    (I.O.E, 2024-04) Panta, Nirmal Prasad; Shrestha, Pawan; Panta, Prince; Basnet, Saki; Adhikari, Surya Prasad
    The adoption of autonomous mobile robots (AMRs) for material handling has witnessed significant growth in various industries, including manufacturing, healthcare, and the service sector. To stay competitive in this era of automation, businesses are increasingly transitioning from human labor to AMRs for efficient transportation and material handling. This project involves developing and testing AMR that utilizes Simultaneous Localization and Mapping (SLAM) and Nav2 (Navigation2) for precise navigation and Computer Vision (CV) for enhanced material handling capabilities. In the first phase, design and development of the mobile robot is done. The second phase involves incorporating SLAM and Nav2 for autonomous mobility of the robot, enabling it to navigate complex environments with accuracy and efficiency and finally, in the third phase, OpenCV is integrated into the autonomous mobile robot for ArUco tag detection for material handling operations. Therefore, in these three phases, we have developed and tested an AMR for material handling purpose using ROS2, SLAM, Nav2 and OpenCV. The process used in this project can be a clear guideline on completing similar projects related to autonomous mobile robots using ROS2 in various areas ranging from manufacturing industries to service industries.