Mechanical Engineering Commons^™

System Identification And State Estimation For Intake Manifold Charge Flow Temperature Of A Compression Ignition Diesel Engine, Ryle D. Maxson

Master's Theses - Daytona Beach

Intake manifold charge temperature is a factor used in mean value engine models (MVEMs) for the calculation of intake mass air charge and oxygen flow. More stringent emission requirements have led to increased deployment of more advanced engine combustion models onto production engine controllers. Measurement of the temperature via physical thermocouple sensors mounted to the engine intake manifold is both slow, in comparison to the changing conditions of an engine, and undesirable due to the cost and increased complexity of extra sensors. A state estimation model has been evaluated that imitates the function of the intake manifold temperature sensor reading, …

Pilot Evaluation Of Energy Savings And Persistence From Residential Energy Demand Feedback Devices In A Hot Climate, Florida Solar Energy Center, Danny Parker

FSEC Energy Research Center®

According to past studies, providing instantaneous feedback on household electrical demand has shown the promise to typically reduce energy consumption by 5-10%. This paper briefly reviews past research and describes a two year pilot evaluation of a low cost residential energy feedback system installed in twenty case study homes in Florida. Although not a statistical sample (the participants were self-selected and interested in reducing energy use), the study showed an average 7% reduction in energy use from feedback homes in the second year of monitoring after controlling for weather-related influences. However, a follow-up evaluation done three years later found little …

Developing Intelligent Engineering Collaboration Tools Through The Use Of Design Rationale, Jordan David Ryskamp

Theses and Dissertations

This thesis presents a new method that improves upon the existing approaches to developing collaborative tools. The new method uses automatically inferred and manually recorded design rationale to intelligently filter the information that is shared by a collaborative tool. This represents an improvement upon the existing state of the art in collaborative engineering tools. To demonstrate the viability of the method three collaborative tools were created. The first is a multi-user collaborative design environment tool named SimulPart and built upon the NX CAD package. SimulPart uses the new method to limit the amount of communication required to keep every user …

2010 Fall Engr333 Project Assignment, Matthew K. Heun

ENGR 333

The Fall 2010 ENGR333 project focused on heating and air-conditioning in campus dormitories, which are notoriously leaky and inefficient.

I asked the students “What would it take to retrofit the Bolt-Heyns-Timmer (BHT) dormitory heating and air-conditioning systems in a manner that achieves LEED certification?”

Customer

The customer for this project was Calvin’s VP for finance Henry DeVries.

Exploring Cost-Effective, High Performance Residential Retrofits For Affordable Housing In The Hot Humid Climate, Florida Solar Energy Center, Janet Mcilvaine

FSEC Energy Research Center®

In 2009, a Department of Energy Building America team led by the Florida Solar Energy Center began working with partners to find cost-effective paths for improving the energy performance of existing homes in the hot humid climate. A test-in energy audit and energy use modeling of the partner's proposed renovation package was performed for 41 affordable and middle income foreclosed homes in Florida and Alabama. HERS1 Indices ranged from 92 to 184 with modeled energy savings ranging from 3% to 50% (average of 26%). Analyses and recommendations were discussed with partners to encourage more efficient retrofits, highlight health and safety …

Defect Detection Microscopy, Stuart Craig Rogers

Theses and Dissertations

The automotive industry's search for stronger lighter materials has been hampered in its desire to make greater use of Magnesium alloys by their poor formability below 150°C. One current challenge is to identify the complex structure and deformation mechanisms at work and determine which of these are primary contributors to the nucleation of defects. Orientation Imaging Microscopy has been the most accessible tool for microstructural analysis over the past 15 years. However, using OIM to analyze defect nucleation sites requires prior knowledge of where the defects will occur because once the defects nucleate the majority of microstructural information is destroyed. …

Reducing Whole Body Vibration Levels In Off-Road, Heavy-Duty Vehicles: A Case Study With Computer Modelling, Shaun Mcfadden, Matthieu Morhan, Brian Hurley

Conference Papers

This paper describes a case study involving the dynamic ride performance of a 30-ton, articulated dumper vehicle. The vehicle in question was originally fitted with a front-end, solid axle with leading arm mechanism. After an engineering design program, the vehicle was custom-fitted with a Timoney Independent suspension system. Extensive testing and modelling activities using LMS Virtual.lab Motion® were undertaken to determine the productivity levels of each vehicle. It was demonstrated that the vehicle fitted with a Timoney suspension could achieve a productivity increase of up to 50%. A health analysis is also presented which shows the Timoney Independent suspension system …

Earth Systems Lesson Plan: Size And Forces Of The Solar System, Getaway Special Team 2010

Education and Outreach

No abstract provided.

Physics Lesson Plan: How Far And Fast Does It Travel?, Getaway Special Team 2010

Education and Outreach

No abstract provided.

Elementary And Middle School Science Lesson Plan: Solid, Liquid, Gas, What Is It?, Getaway Special Team 2010

Education and Outreach

No abstract provided.

Evaluation Of Bias Issues Within Regression-Based Inverse Modeling Methods Against Climate And Building Characteristics Using Synthetic Data, Florida Solar Energy Center, Jamie Cummings

FSEC Energy Research Center®

Typically, a model of the energy use of a building is created using the building's characteristics and climate information for its location. However, models of existing homes can be created using monitored energy and climactic data in a process called inverse modeling. Such a technique has potential for those seeking to evaluate the savings a home before and after a retrofit (Meier, Busch, & Conner, 1988).Several programs use an inverse modeling technique to model a home's energy use based on total home energy use, heating and cooling energy use, and indoor/outdoor temperature data from a home (Kissock, Haberl, & Claridge, …

Modeling Of Micro-Diaphragm For Optical Pressure Sensor For Human Artery Pulse Wave Detection., Khairunnisa Hasikin

Student Works (2010-2019)

This thesis presents the development of a micro-diaphragm for an optical pulse pressure sensor using Micro-electro-mechanical Systems (MEMS) technology. Modelling of the micro-diaphragm was conducted and the comparison of its performance was simulated for silicon nitride and polyirnide materials. In addition. diaphragm's radius and thickness were varied to further analyze the performance of the micro-diaphragm. There are three design parameters that affecting the micro-diaphragm performance namely diaphragms radius. thickness and material. Thus, an optimization analysis using Taguchi method was done to attain significant design parameters that give the best micro-diaphragm performance. Findings indicated that the best performance of the micro-diaphragm …

User's Guide To Mbc3: Multi-Blade Coordinate Transformation Code For 3-Bladed Wind Turbine, G. S. Bir

Publications (E)

The dynamics of wind turbine rotor blades are conventionally expressed in rotating frames attached to the individual blades. The tower-nacelle subsystem though, sees the combined effect of all rotor blades, not the individual blades. Also, the rotor responds as a whole to excitations such as aerodynamic gusts, control inputs, and tower-nacelle motion—all of which occur in a nonrotating frame. Multi-blade coordinate transformation (MBC) helps integrate the dynamics of individual blades and express them in a fixed (nonrotating) frame. MBC involves two steps: transforming the rotating degrees of freedom and transforming the equations of motion. Reference 1 details the MBC operation. …

Sae Baja: Final Drive Gearbox, Michael Mccausland, Michael Watkins, Ian Masterson, Andrew Sommer

Mechanical Engineering

This paper presents the results of a manual transmission project for SAE Baja. A full engineering process is documented, including problem definition, scheduling, conceptualization, decision theory, synthesis, analysis, manufacturing, and testing. A comparison is made between existing and potential mechanical power train solutions. The final design is analyzed in dynamic simulations, AGMA stress, predicted FFT spectrums, and shifting rod buckling. A number of complicated parts are manufactured through investment casting and direct CNC machining. Issues in the final assembly have prevented the project from being fully realized, recommendations are made for future SAE Baja teams.

Differential Regulation Of Immature Articular Cartilage Compressive Moduli And Poisson’S Ratios By In Vitro Stimulation With Igf-1 And Tgf-Β1, Gregory M. Williams, Kristin J. Dills, Christian R. Flores, Michael E. Stender, Kevin M. Stewart, Lauren M. Nelson, Albert C. Chen, Koichi Masuda, Scott J. Hazelwood, Stephen M. Klisch, Robert L. Sah

Mechanical Engineering

Mechanisms of articular cartilage growth and maturation have been elucidated by studying composition-function dynamics during in vivo development and in vitro culture with stimuli such as insulin-like growth factor-1 (IGF-1) and transforming growth factor-beta 1 (TGF-β1). This study tested the hypothesis that IGF-1 and TGF-β1 regulate immature cartilage compressive moduli and Poisson’s ratios in a manner consistent with known effects on tensile properties. Bovine calf articular cartilage from superficial-articular (S) and middle-growth (M) regions were analyzed fresh or following culture in medium with IGF-1 or TGF-β1. Mechanical properties in confined (CC) and unconfined (UCC) compression, cartilage matrix composition, and explant …

Pole Arrangements That Introduce Prismatic Joints Into The Design Space Of Four- And Five-Position Rigid-Body Synthesis, David H. Myszka, Andrew P. Murray

Mechanical and Aerospace Engineering Faculty Publications

Although a general five-position, rigid-body guidance problem admits a discrete number of revolute–revolute (RR) dyads, this paper identifies arrangements of five task positions that result in a center-point curve. For these special arrangements, a one-dimensional set of revolute-prismatic (RP) dyads exist to achieve the task positions. Other five-position arrangements are identified where a one-dimensional set of prismatic-revolute (PR) dyads exist to achieve the task positions. For a general case of five task positions, neither PR nor RP dyads are possible. In a general case of four-position rigid-body guidance problems, a unique PR dyad and RP dyad exist. Four-position arrangements are …

"Pull-In" Of A Pre-Stressed Thin Film By An Electrostatic Potential: A 1-D Rectangular Bridge And A 2-D Circular Diaphragm, Gang Duan, Kai Tak Wan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A one-dimensional (1-D) rectangular pre-stressed thin film clamped at two opposite ends is actuated by an electrostatic voltage applied to a pad directly underneath. the pre-stress is allowed to be either tensile or compressive in nature. at a critical applied voltage, the film becomes unstable and makes direct contact with the pad, leading to "pull-in". an elastic model is constructed to account for the phenomenon over ranges of film pad gap and residual stress. the results compare favorably with finite element analysis (FEA) in literature and experimental data and possess distinct advantages over other available closed-form solutions. the model is …

The Relation Between The Arterial Stress And Restenosis Rate After Coronary Stenting, Linxia Gu, Shijia Zhao, Aswini K. Muttyam, James M. Hammel

Department of Mechanical and Materials Engineering: Faculty Publications

Two commercially available stents (the Palmaz–Schatz (PS) and S670 stents) with reported high and low restenosis rates, respectively, have been investigated in this paper. Finite element models simulating the stent, plaque, and artery interactions in 3 mm stenosed right coronary arteries were developed. These models were used to determine the stress field in artery walls after stent implantation. The material properties of porcine arteries were measured and implemented in the numerical models. The stress concentration induced in the artery by the PS stent was found to be more than double that of the S670 stent. It demonstrated a good correlation …

State Space Model Of A Light Weight Flexible Telescope, Chi-Yeh Hsu

Master's Theses

The accuracy of optical telescope in the past was dominated by the construction of the telescope body and the precision of optical surface. This thesis fits into a larger project with a goal of controlling a flexible telescope in order to help a cheaper telescope achieve higher accuracy. In order to understand the internal motion of telescope, the goal of this thesis is to build a state space model of a two-degree-of-freedom telescope using a known star location as feedback. The model presented in this thesis may be used for the telescope simulation and the control design in the future. …

Me-Em Enewsbrief, September 2010, Department Of Mechanical Engineering-Engineering Mechanics, Michigan Technological University

Department of Mechanical and Aerospace Engineering eNewsBrief

No abstract provided.