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Full-Text Articles in Mechanical Engineering

Design Of A Carbon Fiber Composite Monocoque Chassis For A Formula-Style Vehicle, Alexander Carline Apr 2020

Design Of A Carbon Fiber Composite Monocoque Chassis For A Formula-Style Vehicle, Alexander Carline

Honors Theses

Western Michigan University’s Formula SAE team, Bronco Racing, designs and manufactures a formula-style vehicle to compete annually at an international collegiate design and racing competition. In order to remain competitive, Bronco Racing required a lighter chassis for the 2021 vehicle. To achieve this, the full 2020 carbon fiber monocoque chassis system was redesigned to be lightweight while considering packaging constraints, the Formula SAE rules, and design parameters set by Bronco Racing. The monocoque geometry was modeled using SolidWorks and the carbon composite was simulated, tested, and verified using ANSYS and quasi-static load frame testing. The newly designed 2021 monocoque ...


Design Of A Carbon Fiber Composite Monocoque Chassis For A Formula Style Vehicle, Mitchell Hiller Apr 2020

Design Of A Carbon Fiber Composite Monocoque Chassis For A Formula Style Vehicle, Mitchell Hiller

Honors Theses

Western Michigan University’s Formula SAE team, Bronco Racing, designs and manufactures a formula-style vehicle to compete annually at an international collegiate design and racing competition. In order to remain competitive, Bronco Racing required a lighter chassis for the 2021 vehicle. To achieve this, the full 2020 carbon fiber monocoque chassis system was redesigned to be lightweight while considering packaging constraints, the Formula SAE rules, and design parameters set by Bronco Racing. The monocoque geometry was modeled using SolidWorks and the carbon composite was simulated, tested, and verified using ANSYS and quasi-static load frame testing. The newly designed 2021 monocoque ...


Evaporation Rate From Free Water Surface, Safa M. Aldarabseh Apr 2020

Evaporation Rate From Free Water Surface, Safa M. Aldarabseh

Dissertations

This work aims to perform an experiment in the laboratory and investigate the effect of the wave steepness, airflow velocity, air relative humidity, air temperature, and water surface temperature on the evaporation rate from still and wavy water surface. In this investigation, the experimental results are used to quantify an evaporation rate from a still and wavy water surface under different convection regimes that are free, mixed, and forced convection under turbulent airflow conditions. Empirical correlations are also derived using the experimental results based on modified Dalton’s law and Similarity method (analogy between mass and heat transfer equation). In ...


Fatigue Damage Characterization By Surface Roughness And Instrumented Micro – Hardness Measurements, Suraj Sanjay Nikam Apr 2020

Fatigue Damage Characterization By Surface Roughness And Instrumented Micro – Hardness Measurements, Suraj Sanjay Nikam

Master's Theses

Fatigue is an essential consideration in the design of high performance, safety-critical structures, and components, as fatigue failure constitutes more than 70% of failures in dynamically loaded components. This research aims to shed light on the effect of surface roughness on the micro-hardness in metals through experimental techniques (Part 1), the correlation between the traditional fatigue testing and instrumented cyclic micro-hardness testing to determine the material properties modeled by Ramberg - Osgood relationship(Part 2), and the effect of the fatigue damage on micro-hardness and surface roughness (Part 3).

For this research, Al 7075 - T651 and Al 6061 - T651 chosen as ...


Comparison Of Optimal Energy Management Strategies Using Dynamic Programming, Model Predictive Control, And Constant Velocity Prediction, Amol Arvind Patil Apr 2020

Comparison Of Optimal Energy Management Strategies Using Dynamic Programming, Model Predictive Control, And Constant Velocity Prediction, Amol Arvind Patil

Master's Theses

Due to the recent advancements in autonomous vehicle technology, future vehicle velocity predictions are becoming more robust which allows fuel economy (FE) improvements in hybrid electric vehicles through optimal energy management strategies (EMS). A real-world highway drive cycle (DC) and a controls-oriented 2017 Toyota Prius Prime model are used to study potential FE improvements. We proposed three important metrics for comparison: (1) perfect full drive cycle prediction using dynamic programming, (2) 10-second prediction horizon model predictive control (MPC), and (3) 10-second constant velocity prediction. These different velocity predictions are put into an optimal EMS derivation algorithm to derive optimal engine ...


Development Of A Finite Element Model Of The Stamping Process To Predict The Natural Frequencies Of Dimpled Beams, Varad Vasudeo Pendse Apr 2020

Development Of A Finite Element Model Of The Stamping Process To Predict The Natural Frequencies Of Dimpled Beams, Varad Vasudeo Pendse

Master's Theses

Creating dimples on beams has been proven to be an effective way of altering their vibrational behavior. The objective of this research is to simulate the process of stamping using the finite element (FE) method to create a model of a dimpled beam. This dimple has non-uniform thickness, so it shows close agreement with its real-life counterpart.

ANSYS® Parametric Design Language (APDL) is used to build a three-dimensional (3-D) finite element model and simulate the process of stamping used to create the dimple. The structural simulation is validated by calculating the thickness and width of the deformed geometry of the ...


Mechanical And Aerospace Engineering, 2019-2020, College Of Engineering And Applied Sciences Jan 2020

Mechanical And Aerospace Engineering, 2019-2020, College Of Engineering And Applied Sciences

Mechanical and Aerospace Engineering News

  • Letter from the Chair
  • The MAE Staff
  • Dr. Zachary Asher
  • Alumni Excellence Academy Inductees
  • From Sunway University to Success in America
  • Student Experience at the Oshkosh Airventure
  • Parker-Hannifin Donates New Hydraulic Trainers
  • Electric Ducted Fan Lab for the Aircraft Propulsion Course
  • MAE Faculty


Lightweight Racing Suspension, Colin Haynes Dec 2019

Lightweight Racing Suspension, Colin Haynes

Honors Theses

The purpose of this senior design project is to design and optimize the new suspension system for Western Michigan University’s 2020 solar car. The current solar car was 43% heavier than the average solar car, and was the heaviest single occupant vehicle competing in the American Solar Challenge. The scope of the project is to reduce the weight as much as possible from the old 2016 suspension. The new suspension weighed 34.91 lbs less than the 2016 suspension system while maintaining a minimum factor of safety greater than 1.5, compliant with American Solar Challenge regulations. The design ...


A Reinforcement Learning Approach To Spacecraft Trajectory Optimization, Daniel S. Kolosa Dec 2019

A Reinforcement Learning Approach To Spacecraft Trajectory Optimization, Daniel S. Kolosa

Dissertations

This dissertation explores a novel method of solving low-thrust spacecraft targeting problems using reinforcement learning. A reinforcement learning algorithm based on Deep Deterministic Policy Gradients was developed to solve low-thrust trajectory optimization problems. The algorithm consists of two neural networks, an actor network and a critic network. The actor approximates a thrust magnitude given the current spacecraft state expressed as a set of orbital elements. The critic network evaluates the action taken by the actor based on the state and action taken. Three different types of trajectory problems were solved, a generalized orbit change maneuver, a semimajor axis change maneuver ...


Estimation Of The Fatigue Life Of Additively Manufactured Metallic Components Using Modified Strain Life Parameters Based On Surface Roughness, Grohs Dec 2019

Estimation Of The Fatigue Life Of Additively Manufactured Metallic Components Using Modified Strain Life Parameters Based On Surface Roughness, Grohs

Master's Theses

In this study, a method is developed to estimate the effects of surface roughness on the fatigue life of additively manufactured titanium Ti6Al4V, aluminum 7075–T6, and steel 4340 alloys through modified strain life parameters using finite element analysis (FEA). This method is highly beneficial to the fatigue analysis of as-built additively manufactured metal components, which possess rough surfaces that reduce fatigue life significantly but are challenging to analyze directly using finite element simulation because of complex geometries, i.e., modeling an exact surface profile is arduous.

An effective stress concentration factor, incorporating roughness data, is defined to quantify their ...


Gearbox Baffle Optimization, Arduin Dec 2019

Gearbox Baffle Optimization, Arduin

Master's Theses

Current literature reveals there is limited consensus on the placement of baffles within a gearbox to reduce churning losses. Thus, there is a need for a process to identify baffle clearances that result in maximum and minimum churning losses. There are two types of baffles: axial and radial. While both axial and radial baffles cause reductions in churning losses to various degrees, the focus is on the effect of radial baffles. The effect of a board (rectangular plate) baffle location on the churning losses of a single gear gearbox are evaluated using computational fluid dynamics (CFD) implemented in Ansys. Several ...


3d Printing Robotic Arm On Linear Rails, Thomas T. Steele Apr 2019

3d Printing Robotic Arm On Linear Rails, Thomas T. Steele

Honors Theses

Typical 3D printers are bound by the printing bed volume relative to the printer frame volume. A 3D printing robotic arm set upon sliding linear rails was designed and built. The arm was 3D printed with a traditional 3D printer designed using Autodesk Inventor. This product reduces printer size while increasing bed area and reduces cost with use of 3D printed parts.


Optimal Energy Management For Forward-Looking Serial-Parallel Hybrid Electric Vehicle Using Rule-Based Control Strategy, Jadhav Apr 2019

Optimal Energy Management For Forward-Looking Serial-Parallel Hybrid Electric Vehicle Using Rule-Based Control Strategy, Jadhav

Master's Theses

In today’s sophisticated era of technology, resolving environmental problems is a matter of grave concern. Developing hybrid electric vehicles is a good step towards environmental preservation, since they use less fuel compared to conventional vehicles because of the combination of electric and mechanical energy. A hybrid electric vehicle reduces dependence on fossil fuels and hence lowers emissions. Specifically, a hybrid powertrain that includes a conventional gasoline engine and a brushless DC motor offers great potential to meet stringent CO2 regulations and fuel economy requirements. This thesis focuses on the effects of initial state of charge (SOC) stored in ...


Training Set Density Estimation For Trajectory Predictions Using Artificial Neural Networks, Reinke Apr 2019

Training Set Density Estimation For Trajectory Predictions Using Artificial Neural Networks, Reinke

Master's Theses

Demand on earth orbiting surveillance systems in increasing as more equipment is put into orbit. These systems rely on predictive techniques to periodically track objects. The demand on these systems may be reduced if object trajectory data to develop scalable training sets used for training artificial neural networks (ANNs) to predict trajectories of a dynamic system. These methods use multi-variable statistics to analyze data energy content to provide the ANN with low density, feature-rich, training data. The developed techniques have been shown to increase ANN prediction accuracy while reducing the size of the training set when applied to a linear ...


Modeling And Simulation With Optimal Gear Ratio For A Forward-Looking, Velocity-Driven, Power-Split Hybrid Electric Vehicle, Kanap Apr 2019

Modeling And Simulation With Optimal Gear Ratio For A Forward-Looking, Velocity-Driven, Power-Split Hybrid Electric Vehicle, Kanap

Master's Theses

Increases in vehicle demand and fossil fuel consumption are major contributors to environmental problems, such as air pollution and climate change. This has led to research on alternative, energy-efficient vehicle technologies. Automobile users are now preferring comfortable vehicles with minimal fuel consumption and with more efficient engines. Hybrid cars are becoming common because of their advantage of running cleaner and with better gas mileage. A hybrid car runs on the power of both an electric motor and a gasoline engine. This mechanism helps cut fuel consumption and conserve energy. An additional advantage is a regenerative braking system that helps recharge ...


Design Of A Portable Biogas Purification And Storage System, Anikumar Kosna, Bade Shrestha Mar 2019

Design Of A Portable Biogas Purification And Storage System, Anikumar Kosna, Bade Shrestha

Faculty Research and Creative Activities Award (FRACAA)

The objective of this study is to propose and design a commercial portable purification and storage system to commercialize biogas (which mainly consists of 45 - 75 % of methane and 15 - 16% of carbon dioxide), produced from household/non-commercial biogas plants. The selection of purification process is based on the portability of the purification system.


Mechanical And Aerospace Engineering, 2018-2019, College Of Engineering And Applied Sciences Jan 2019

Mechanical And Aerospace Engineering, 2018-2019, College Of Engineering And Applied Sciences

Mechanical and Aerospace Engineering News

  • Letter from the Chair
  • Introducing Dr. Zachary D. Asher
  • Department of Mechanical and Aerospace Engineering develops an engineering flight simulator
  • Gear Sliding Loss Prediction
  • Ph.D. student receives the prestigious NASA Earth and Space Science Fellowship
  • NSF grant allows important materials research
  • Student receives scholarship from gear industry
  • Development of low cost/high volume micro/nano sensors and actuators
  • Liou receives $204,000 NSF grant for neurological research
  • Alexander Porter inducted into the Alumni Excellence Academy


Finite Element Modeling And Experimental Characterization Of Knot Configuration Effect On The Mechanical Performance Of Surgical Suture, Arz Y. Qwam Alden Dec 2018

Finite Element Modeling And Experimental Characterization Of Knot Configuration Effect On The Mechanical Performance Of Surgical Suture, Arz Y. Qwam Alden

Dissertations

Tendon injuries in orthopedic surgery and sports medicine are escalating; hence there is great interest in improving tendon repair. The integrity of tendon repair depends in part on a combination of suture material, suture size and knot configuration. Recent studies have indicated the failure of surgical knots as a failure mode during surgical repair. Further, there is still no consensus on the ideal (best/safest) surgical knot techniques. Also, this failure mode is related to stress concentrations, which cannot be easily established with traditional tensile testing. Most researchers have focused on the measurement and comparison of the gross structural response ...


Hybrid Processes In Material Removal Of Hard And Brittle Materials, Hossein Mohammadi Dec 2018

Hybrid Processes In Material Removal Of Hard And Brittle Materials, Hossein Mohammadi

Dissertations

New technologies demand new materials with better mechanical, optical, and thermal properties. Materials that are light weight, strong with high resistance to high temperatures, and compatible with a predetermined condition. Such materials usually are challenging to manufacture and process compared to widely available materials such as metals. Ceramics and semiconductors are considered extremely hard and brittle, making them very difficult to cut and manufacture. The other major and fast-growing type of materials are composites (including Ceramic Matrix Composites, CMC) that are also considered very challenging to machine. All these materials have many applications in major industries (i.e. electronics, aerospace ...


Design Of A Portable Biogas Purification And Storage System, Kosna Dec 2018

Design Of A Portable Biogas Purification And Storage System, Kosna

Master's Theses

Biogas is produced from the decomposition of organic materials like manure, sewage sludge or crop fodders in anaerobic digesters. It consists mainly of 40 – 75 % of methane (CH4), 15 – 60 % of carbon dioxide (CO2) and trace amounts of other components. The principle constituents of biogas are similar to natural gas. Natural gas has 87 – 97 % of methane (CH4) and 0.1 – 1 % of carbon dioxide. Natural gas is known to be an alternative fuel with a wide range of applications. The commercial purification technologies exist for large-scale biogas units. However, there are no such commercial purification technologies ...


Optimization Of Analytical Inverse Heat Transfer Recovery Solution, Schick Dec 2018

Optimization Of Analytical Inverse Heat Transfer Recovery Solution, Schick

Master's Theses

This thesis describes the different methods used when trying to solve inverse heat transfer problems, particularly those involving recovering heat flux. There are currently several techniques to measure the temperature history in an object subjected to heat transfer using various temperature sensors, however these types of sensors are gradually being replaced by Temperature Sensitive Paints (TSP), a technique that is more accurate and provides a better spatial resolution. TSP is a polymer that is applied on a base object. Changes in temperature in the polymer result in variations of the luminescence intensity in the paint. These variations can be captured ...


Liquid-To-Liquid Low Grade Waste Heat Recovery Using A Two-Channel Loop, Farwana Dec 2018

Liquid-To-Liquid Low Grade Waste Heat Recovery Using A Two-Channel Loop, Farwana

Master's Theses

The use of thermoelectric generators (TEGs) for producing electric energy from low grade “waste heat” has been theorized to provide a sustainable and low-cost energy source for electric power plants. The purpose of this study is to model and experimentally validate a TEG device that takes advantage of low grade waste heat (approximately 100-150 degrees Celsius) in liquid form in order to generate power that can be used for various applications in the surrounding environment. This research aims to demonstrate that optimized TEG designs bear the potential to compete with other methods of low grade waste heat energy harvesting in ...


Decomposition And Ionization Of Ionic Liquids, Forrest Grady Kidd Iii Aug 2018

Decomposition And Ionization Of Ionic Liquids, Forrest Grady Kidd Iii

Dissertations

The United States Air Force is interested in developing a situationally responsive space environment. In order to achieve this, dual-mode-propulsion will be utilized. A new class of propellants is being developed for this application based on energetic ionic liquids. Two ionic liquids of current interest are Hydroxylammonium Nitrate (HAN) and Hydroxyethylhydrazinium Nitrate (HEHN) due to their beneficial performance characteristics. The decomposition and ionization chemistry of these two species is investigated in this work. Using GAUSSIAN09 software, reactions with important radicals are explored through quantum chemistry. The energetics of reactions as well as the identity of key product complexes are given ...


Experimental Comparison Between Hollow Cathodes With Cermet, Lanthanum Hexaboride, And Barium Oxide Insert Materials, Simmons Aug 2018

Experimental Comparison Between Hollow Cathodes With Cermet, Lanthanum Hexaboride, And Barium Oxide Insert Materials, Simmons

Master's Theses

This thesis compares two different hollow cathode assemblies (HCA) using three different insert materials. NASA’s Jet Propulsion Laboratory (JPL) provided the H6 HCA and the Lanthanum Hexaboride (LaB6) insert. A barium oxide (BaO) insert was purchased from Ebeam and used with the H6 HCA. The novel Cermet material was purchased from Plasma Controls, LLC and the HCA was based on the JPL H6 HCA. Plasma properties in the external region of all three inserts and the internal region of the LaB6 were determine using two separate Langmuir probes. Various operating points were tested at a combination of ...


Control-Oriented Automatic Transmission- Based Powertrain Modeling And Simulation With Judder, Kundale Aug 2018

Control-Oriented Automatic Transmission- Based Powertrain Modeling And Simulation With Judder, Kundale

Master's Theses

This work presents automatic transmission-based powertrain modeling. The powertrain consists of an engine, torque converter with lock up clutch, transmission gearbox, propeller shaft, and vehicle body. Simplified powertrain component models are developed for vehicle powertrain dynamic response analysis and future control work. The powertrain components are modeled with algebraic and first order non-linear differential equations. A MATLAB-based powertrain simulation system is developed to investigate the transient characteristics during lock up of torque converter. Simulation results are used in the determination of effects of judder on torque and angular velocity. Clutch judder is a self-excited vibration that occurs during the clutch ...


Measurements Of Fluid Structures And Mass Transport In Channel With Fabric Base, Karl David Mcallister Jun 2018

Measurements Of Fluid Structures And Mass Transport In Channel With Fabric Base, Karl David Mcallister

Dissertations

This thesis studies the relationships between flow structures and mass transport (dye concentration) within a Poiseuelle water flow glass chamber using optical flow experimental techniques in turbulent conditions. Through optical flow methods, velocity, vorticity, kinetic energy, Reynolds stress and turbulent production metrics where determined by laser illuminated glass beads and Rhodamine 6G dye removing from three different fabric substrates for multiple horizontal planes and one vertical plane. From the dye intensity, mass concentration metrics were determined providing visualization of velocity and mass transport simultaneously along with kinetic energy, mass flux, and concentration fluctuations.


Structural Reinforcement Of Streamline Tubing, Peter Grohs Apr 2018

Structural Reinforcement Of Streamline Tubing, Peter Grohs

Honors Theses

Structural integrity of suspension components is important to the safety and the longevity of vehicles. Streamline tubing, an aerodynamically shaped material used in high performance vehicle controls, can be prone to failure if not properly analyzed for its asymmetric geometry. The component was redesigned as a composite structure using modern materials to make a highly aerodynamic product stiffer, stronger, and lighter per unit weight than a conventional all steel design. Finite element analysis was conducted and five prototypes using different materials were constructed and tested. This method of maximizing component lightness and stiffness using the beneficial properties of each material ...


Design Of Force Versus Displacement Test Stand, Andrew Fritchley Apr 2018

Design Of Force Versus Displacement Test Stand, Andrew Fritchley

Honors Theses

Performing mechanical design around sensors is a critical skill which all engineering students should be familiar with. Of equal importance is gathering and correctly interpreting electrical data from engineering tests. The aim of this project is to design a force versus displacement test stand for applications related to the measurement of spring force-displacement correlation. The design uses a strain gauge load cell, and a magnetic linear encoder to provide accurate, repeatable force and travel measurements. A mechanical design to mount each sensor was created based initial project constraints. Finite element analysis was performed on all critical components to ensure that ...


Virtual Reality Power Chair Simulator For Human Operator Modeling And Tremor Filtering, Rick Meyer Apr 2018

Virtual Reality Power Chair Simulator For Human Operator Modeling And Tremor Filtering, Rick Meyer

Faculty Research and Creative Activities Award (FRACAA)

Approximately 180,000 persons who have a need for a powered wheelchair (PWC) suffer from Parkinson's’ hand tremor that makes it difficult, even potentially dangerous, for them to operate it. Persons with hand tremor that attempt to operate a PWC have to try to compensate for their tremor, which may not be realistically possible if the tremor is severe enough. Hand tremor can lead to sudden changes in PWC joystick commands that could result in unsafe PWC movements and collisions resulting in injury and/or property damage. These tremor sufferers are candidates for an assistive PWC. As a step ...


Forward-Looking, Velocity-Driven, Powertrain Modeling And Optimal Control For Continuous Variable Transmission, Deshmukh Apr 2018

Forward-Looking, Velocity-Driven, Powertrain Modeling And Optimal Control For Continuous Variable Transmission, Deshmukh

Master's Theses

This thesis is the second part of a two-part study focused on improving Continuous Variable Transmission (CVT) ratio management and control. The objective of the overall project was to develop a methodology for a vehicle with a CVT and a downsized gasoline engine to deliver the maximum vehicle fuel economy within drivability and performance constraints. The first part of this study, as described in [1], focuses on developing a cycle driven model for optimizing the CVT ratio. The study presented in this paper focuses on developing a velocity driven model to simulate the real-time behavior of a vehicle. The results ...