Applied Mechanics Commons^™

Jun 2004, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Vinod Gupta Gift Camp Creek Swap Meet UNL Signage to Museum

Mar 2004, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Curator's Report Director's Report Treasurer's Report

Jan 2004, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

NE Museum Budget Cuts Selling Farmall H Husker Harvest Days

Investigation Of Four-Wheel Steering Algorithms For A Formula Sae Car, Colm O'Kane, Sean Timoney

Conference Papers

An algorithm was developed for a speed-dependent four-wheel steering system for a Formula SAE car. A linear bicycle model was implemented using the MATLAB and SIMULINK software packages. Various control laws were investigated for the rear steer angle with the objective of reducing the sideslip angle. A full 3D model of the vehicle incorporating weight transfer and tire non-linearity was then developed using the DADS software. An algorithm developed using the linear model with the aim of reducing vehicle sideslip angle was implemented in the nonlinear model. It is shown that this algorithm can improve the dynamic performance for both …

Dec 2003, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Introductions Curator's Report Treasurer's Report

Oct 2003, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Farmall Donation Storage Space Funding Opportunities

Jun 2003, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Rehabilitation of Behlen Building Test Car Location Inside Insulation

Mar 2003, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Foundations Liason Report Development Projects Report Report to the Director

Jan 2003, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Interim Director Report Open House Suggested to Open Museum on Saturdays

Analytical And Fea Analysis Of Silicon Micro-Machined Capacitive Pressure Sensor, Eoghan O'Donoghue

Theses

This thesis is concerned with the electro-mechanical characterisation of MEMS capacitive pressure sensors and the determination of models to describe their behaviour.

The finite element software package ANSYS is validated as a tool for the examination of the electro-mechanical behaviour of capacitive pressure sensors. It is then used to incorporate the effects of applied load, voltage and residual stress into a model of the sensor structure. The capacitive pressure sensor is modelled both in 3D and also in 2D axis-symmetric modes. The error between the 2D and 3D models is quantified.

The behaviour of structures under electrostatic actuation is investigated. …

Dec 2002, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Report from Director on Leave Development Projects Liason Report

Oct 2002, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Husker Harvest Days Fund Raising Interim Director

Apr 2002, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Potential Board Members Conservation Assessment Program Tractor Museum Calender

Jan 2002, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Newsletter Report Museum Open House 149 visitors

Flow Patterns In A Two-Roll Mill, Christopher Hills

Articles

The two-dimensional flow of a Newtonian fluid in a rectangular box that contains two disjoint, independently-rotating, circular boundaries is studied. The flow field for this two-roll mill is determined numerically using a finite-difference scheme over a Cartesian grid with variable horizontal and vertical spacing to accommodate satisfactorily the circular boundaries. To make the streamfunction numerically determinate we insist that the pressure field is everywhere single-valued. The physical character, streamline topology and transitions of the flow are discussed for a range of geometries, rotation rates and Reynolds numbers in the underlying seven-parameter space. An account of a preliminary experimental study of …

Effect Of Residual Thermal Stresses On Fracture Behavior And Mechanical Properties Of Al Sub 2 O Sub 3/Ni Cermets, Guo Jin Li, Da Ming Chen, Xiao Xian Huang, Jing Kun Guo

Faculty Publications

Effect of residual thermal stresses on fracture behavior and mechanical properties of Al₂O₃/Ni cermets was qualitatively explained by using theory on residual thermal stresses. When Ni particles are located within Al₂O₃ grains or Ni content is relatively low, tensile stresses are exerted at Al₂O₃-Al₂O₃ grain boundary. While fracturing, intergranular fracture is easily produced. When Ni particles are dispersed at Al₂O₃ grain boundary or Ni content is relatively high, compressive stresses are exerted at Al₂O₃-Al₂O₃grain boundary. …

Oct 2001, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Software Program Storage Space Needed 16 new members

Jul 2001, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

UN Foundation Tractor Raffle Oliver Tractor Repair

Apr 2001, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Camp Creek Swap Meet Public Relations Get Fordson Running

Jan 2001, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

New Personel Area rearrangement Missouri Valley Wrench Club

Finite Element Analysis And Active Control For Nonlinear Flutter Of Composite Panels Under Yawed Supersonic Flow, Khaled Abdel-Motagaly

Mechanical & Aerospace Engineering Theses & Dissertations

A coupled structural-electrical modal finite element formulation for composite panels with integrated piezoelectric sensors and actuators is presented for nonlinear panel flutter suppression under yawed supersonic flow. The first-order shear deformation theory for laminated composite plates, the von Karman nonlinear strain-displacement relations for large deflection response, the linear piezoelectricity constitutive relations, and the first-order piston theory of aerodynamics are employed. Nonlinear equations of motion are derived using the three-node triangular MIN3 plate element. Additional electrical degrees of freedom are introduced to model piezoelectric sensors and actuators. The system equations of motion are transformed and reduced to a set of nonlinear …

Eddy Structures Induced Within A Wedge By A Honing Circular Arc, C. P. Hills

Articles

In this paper we outline an expeditious numerical procedure to calculate the Stokes flow in a corner due to the rotation of a scraping circular boundary. The method is also applicable to other wedge geometries. We employ a collocation technique utilising a basis of eddy (similarity) functions introduced by Moffatt (1964) that allows us to satisfy automatically the governing equations for the streamfunction and all the boundary conditions on the surface of the wedge. The circular honing problem thereby becomes one-dimensional requiring only the satisfaction of conditions on the circular boundary. The advantage of using the Moffatt eddy functions as …

Eddies Induced In Cylindrical Containers By A Rotating End Wall, Christopher Hills

Articles

The flow generated in a viscous liquid contained in a cylindrical geometry by a rotating end wall is considered. Recent numerical and experimental work has established several distinct phases of the motion when fluid inertia plays a significant role. The current paper, however, establishes the nature of the flow in the thus far neglected low Reynolds number regime. Explicitly, by employing biorthogonality relations appropriate to the current geometry, it is shown that a sequence of exponentially decaying eddies extends outward from the rotating end wall. The cellular structure is a manifestation of the dominance of complex eigensolutions to the homogeneous …

Oct 2000, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Open House Pedestrian Door Installed Collection of Hand Tools

Jul 2000, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

Midwest Tool Collectors Annual Meeting Camp Creek Thresher's Event North Door Replaced

Apr 2000

Lester F. Larsen Tractor Museum: Planning and Development Documents

State Museum Report Raffle Committee Book Sales Plans

Diffusion Problems In Wound Healing And A Scattering Approach To Immune System Interactions, Julia Suzanne Arnold

Mathematics & Statistics Theses & Dissertations

A theoretical model for the existence of a Critical Size Defect (CSD) in certain animals is the focus of the majority of this dissertation. Adam [1] recently developed a one-dimensional model of this phenomenon, and chapters I–V address the exist the CSD in a two-dimensional model and a three-dimensional model. The two dimensional (or 1-d circular) model is the more appropriate for a study of CSD's. In that model we assume a circular wound of uniform depth and develop a time-independent form of the diffusion equation relevant to the study of the CSD phenomenon. It transpires that the range of …

A Comparison Of Quasi-Static Indentation Testing To Low Velocity Impact Testing, Michael J. Douglas

Mechanical & Aerospace Engineering Theses & Dissertations

A static test method for modeling low-velocity foreign object impact events to composites would prove to be very beneficial to researchers since much more data can be obtained from a static test than from an impact test. In order to examine if this is feasible, a series of static indentation and low velocity impact tests were carried out and compared. Square specimens of many sizes and thicknesses were utilized to cover the array of types of low velocity impact events. Laminates with a rt/4 stacking sequence were employed since this is by far the most common type of engineering laminate. …

Feb 2000, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

M.H. Pony Raffle Promotional Brochere Inventory and Displays

Jan 2000, Tractor Museum

Lester F. Larsen Tractor Museum: Planning and Development Documents

By-Law Amendments Nominations Potential New Signs