Digital Commons Network^™

Measurement Method For Dynamic Flow Characteristics Of Hydraulic Bushing Features, Michael S. Kennedy, Kenneth B. Degarmo, Luke T. Fredette

Scholars Symposium

Hydraulic bushings are soft mechanical joint components which provide excellent vibration damping for a low-frequency band. These properties emerge from a tuned dynamic interaction between several features which either store or dissipate energy when the joint is flexed. In order to design and predict the dynamic properties of a hydraulic bushing, an understanding of the underlying physics governing each feature is needed. Typical feature models are based on many assumptions which are unlikely to be physically realistic under in situ loadings, so this study seeks to investigate the dynamic properties of hydraulic bushings’ flow passages under unsteady flow conditions.

In …

The Regression Of The Flood In Virginia, James C. Rakestraw, Jim Melnick

Proceedings of the International Conference on Creationism

The geology, tectonics, and hydraulics of the regression of the Flood formed much of the geomorphology of Virginia. Opportunities to view and study geology and geomorphology are available through visiting parks, traveling on public roads, and viewing geographic information system (GIS) resources.

Virginia is part of the North American Plate. A series of “blocks” of basement rocks within the plate underlie the geomorphological provinces of Virginia. These “blocks” form a series of steps between the Atlantic Ocean Basin and the Blue Ridge. The “Fall Line” found in Virginia is a fault between two blocks of basement rock. The basement rocks …

How To Treat Alzheimer’S Disease By Boosting Glymphatic Flow: Simulations In A New Computational Model, Charles F. Babbs

Weldon School of Biomedical Engineering Faculty Working Papers

This study exercises a new mathematical model to search for unappreciated therapeutic targets in Alzheimer’s disease. The model describes detailed mechanisms underlying the glymphatic pump mechanism, which removes toxic proteins of Alzheimer’s disease from the interstitial fluid of the brain. It shows that the glymphatic pump is driven by the amplitude of intracranial pressure pulsations in the subarachnoid space, which are correlated with the arterial pulse and modulated by many other factors. Implementing ways to increase intracranial pressure pulses quickly comes to mind as a potential treatment strategy. Specific interventions include drugs that increase arterial pulse volume and small devices …

Simplified Demonstration Of A New Perivascular Pump Mechanism For Glymphatic Flow Of Interstitial Fluid In The Brain, Charles F. Babbs

Weldon School of Biomedical Engineering Faculty Working Papers

In a previous paper the author presented details of a new mechanism for the perivascular pump driving glymphatic flow—the brain’s waste removal system. The goal was to capture the essence of complex three-dimensional anatomy and physiology of the brain in a reduced order geometric model. The complexity required to make the model even approximately brain-like tended to obscure the most basic features of the perivascular pump. Here a bare-bones, “simplissimo” model of the perivascular pump is presented. It highlights only the most essential features of the pump mechanism. It also reveals components of brain anatomy and physiology that are not …

A New Mechanism For Glymphatic Flow Of Interstitial Fluid In Branched Perivascular Spaces Of The Brain, Charles F. Babbs

Weldon School of Biomedical Engineering Faculty Working Papers

Objective. To explore the biophysics of interstitial tissue fluid flow in the brain, based upon the anatomy and mechanics of the perivascular spaces, in order to better understand how glymphatic flow happens. Methods. The dynamics of fluid flow at cardiac frequencies are investigated in rapidly computable, branched, geometric models of brain tissue at multiple scales. The models are supplied by intermingled trees of penetrating arteries and veins. They include pulsatile changes in intracranial pressure and intravascular pressure, elastic expansion of brain tissue, and nonlinear changes in resistance to flow of cerebrospinal fluid along the axis of the Virchow-Robin space. Resulting …

3d Hydrostratigraphic And Hydraulic Conductivity Modeling Using Supervised Machine Learning, T. A. Tilahun, Jesse T. Korus Dr.

Conservation and Survey Division

No abstract provided.

Selecting Soil Hydraulic Properties As Indicators Of Soil Health: Measurement Response To Management And Site Characteristics, D. K. Bagnall, C.L.S. Morgan, G. Mac Bean, D. Liptzin, Andrew E. Suyker Et Al.

School of Natural Resources: Faculty Publications

No abstract provided.

Development Of Tractor Instrumentation System: Hydraulics, And Controller Area Network (Can) Data Analysis Of Agricultural Machinery, Chee Town Liew

Department of Biological Systems Engineering: Dissertations and Theses

The tractor is a very important piece of machinery in agriculture, and it has been evolving and progressing over the years with improved and increasingly complex functionality. Controller Area Network (CAN) has been incorporated into tractors and other machinery with SAE J1939 and ISO 11783 standards, serving as the communication bus for various on-board electronic controller units (ECUs), and carries various machine operation data that can be used for analyzing machine performance. Investigation of data extraction from CAN messages was conducted by examining the SAE J1939 and ISO 11783 standards. A case study on CAN bus data analysis for a …

Half-Barrel Planter Mover, Mihir Shah, Natalie Lewis, Mason James Hughes

Mechanical Engineering

A device for transporting heavy barrel planters is needed. Barrel planters are wooden wine barrels that have been cut in half along the circumference. They are used to store and grow a variety of plants. As such, they can contain more than 300 pounds of soil. The products currently on the market are not designed for such heavy planters, are cost prohibitive, and do not take advantage of the tapered design of a wine barrel half. A solution is needed that is durable, easy to use, and low cost. This final design report will show the steps used to find …

Hydraulic Balsa Wood Rising Bridge, Kaitlyn Greenfield

All Undergraduate Projects

What is the solution to allowing tall vessels to navigate past a vehicle bridge that is less than 10 [ft] above the water? To answer this question, a balsa wood bridge was designed, constructed, and tested. The bridge needed to articulate by mechanical means, allow for travel through the bridge, and be able to withstand ample force while the main structure only being constructed of balsa wood and glue. The project was analyzed in sections. These sections include: the bridge structure and its members, the hydraulic lift, and the pins needed for the bridge and hydraulic lift to operate. The …

Fluid Power Vehicle Challenge, Jacob Torrey, Kayla Londono, Bryson Chan, Aaron Trujillo

Mechanical Engineering

The FPVC combines mechanical engineering disciplines to design and manufacture a vehicle that utilizes hydraulic power. The FDR covers the final manufacturing process and verification processes developed during the front end of research and analysis built upon the Critical Design Review (CDR) and the PDR (Preliminary Design Review). This report showcases the design decisions and extensive research that supports the continuing efforts by the Team Pump My Ride, to build upon the accomplishments of Cal Poly’s previous team, The Incompressibles. The FDR presents how Team Pump My Ride produced the design changes from the CDR and PDR to achieve improvements …

Can Hydraulic Conductivity Of Fluvial Sediments Be Informed By Spectral Reflectance?, Li Yao Li, Can Liu, Gengxin Ou, Zhaowei Wang, Jesse Korus, Ran Jiang

School of Natural Resources: Faculty Publications

No abstract provided.

The Role Of Particle Shape On The Hydraulic Conductivity Of Granular Soils Captured Through Kozeny-Carman Approach, Thanh Trung Nguyen, Buddhima Indraratna

Faculty of Engineering and Information Sciences - Papers: Part B

Previous studies indicate that particle shape plays an important role in the hydraulic conductivity (k) of granular materials, often represented through the Kozeny-Carman (KC) concept. Several recent studies have improved the accuracy of the KC approach using the particle size distribution (PSD) to estimate the specific surface area of particles but overly simplifying the effect of particle shape. This current study innovatively adopts the Micro-Computed Tomography (CT) technique to compute particle shape parameters of different granular materials (e.g., glass beads, sand and crushed gravel) and then incorporate these parameters into the KC equation to estimate k more accurately, which is …

Modeling And Simulation Of The Dynamic Effects Of Pressure Variations On Hydraulic Bladder And Piston Style Accumulators, Colin Loudermilk

Masters Theses

Hydraulic accumulators, being critical for system control, must meet performance parameters depending on system requirements. Multiple types of accumulators exist which provide varying levels of performance. These levels are not well-defined in most technical literature. A mathematical model was developed and computer simulation was used to fill some of the gap. Multiple accumulator systems were mathematically modeled in the Simulink environment and their performance characteristics were determined. Gas-charged bladder and double-acting piston accumulators were simulated with varying degrees of damping due to friction, the main factor that separates the two types. It is shown that a bladder accumulator will in …

Heat: Hydraulic And Electric Animation Team, Tyler J. Couvrette, Michael J. Cain, Sara T. Novell, Dexter K. Yanagisawa

Mechanical Engineering

Each New Years’ Day, the Cal Poly Rose Float presents a flower-covered float to the world at the Tournament of Roses parade. This floral display, paired with moving mechanical animations, shows off Cal Poly to the world. This project strove to keep Cal Poly on the cutting edge of technology both in parade floats, and in engineering, by creating a completely electric-powered animation system.

To accomplish this, a group of students set out to make the fully electric animation system that can power both the hydraulic and electric mechanisms on the Float. This was accomplished through months of planning and …

Solar Greenhouse With Polyethylene Film In Semi-Cylinder Form, Shavqi Kulaganovich Niyozov, Rustam Ummatqulovich Elmuratov, Raximjon Shokir OʼGʼLi Daminov, Аmirbek Umarbekovich Jumaniyozov

Bulletin of Gulistan State University

This article presents the results of a pilot study of greenhouses with a semi-cylindrical, two-layer, transparent barrier for farmers, farmers and entrepreneurs. According to the analysis, the difference between the proposed greenhouse and the greenhouse is different from other greenhouses. When the air temperature inside the solar chamber reaches 25-300 °C, the electric fan is turned on, and the heated air is removed from the pipe and transferred to a short-lived battery underground. Solar panels are used as a current source for this fan. This technology shows the amount of energy stored in the greenhouse to meet the needs of …

Investigation Of Dredge Material Dewatering Through Hydraulic And Ground Improvement Methods, Monica Moody

Williams Honors College, Honors Research Projects

Every year almost 1.5 million tons of material is dredged from Lake Erie to allow passage for boat traffic. In the past, this material has been placed back into the open waters of the lake. However, starting July 2020 this will no long be permitted due to the passing of Senate Bill 1. Therefore, secondary uses of this dredging material are being investigated. To be used, the material needs to be quickly dewatered and stabilized. This project consists of literary reviews of two methods of rapid dewatering, hydraulic placement and ground improvement methods. Hydraulic placement dewatering requires the use of …

Investigating Mechanisms Of Hydraulic Conductivity Transience In Sandy Streambeds, Wilhelm Fraundorfer

School of Natural Resources: Dissertations, Theses, and Student Research

Streambed hydraulic conductivity (K) is known to be spatially and temporally heterogeneous, but few attempts to understand the controls on temporal variability have been made. This study documents temporal K transience and demonstrates how hydraulic, geophysical, and sedimentological methods can be combined to understand the processes that give rise to changes in streambed K. Falling head permeameter tests and slug tests were conducted to determine vertical K (K_v) and K (slug test K), respectively. These tests were repeated three times over a twelve-week period on the same grid at a depth of 0.5 …

Hydraulic Fracturing In The United States: A Framing Analysis, Kenneth Stephen Cardell Jr.

Theses and Dissertations

This research considers the issue of hydraulic fracturing, a controversial method of extracting natural gas from shale and coal deposits. The technology, commonly referred to as “fracking,” has only been employed on an industrial scale since the late 1990s and is increasingly becoming the focus of news coverage. In this thesis research, a representative sample of both national and regional newspaper coverage on the issue of hydraulic fracturing is analyzed, looking at several key elements of framing. This study also examines differences in issue framing between the national elite press and regional news sources, as well as based upon partisanship. …

A Novel Mode-Switching Hydraulic Hybrid For An On-Highway Vehicle: A Study Of Architecture And Control, Hiral Jayantilal Haria

Open Access Theses

Increasing demand for fossil fuels, their limited reserves and the environmental effects resulting from the transportation sector has raised severe concerns to government agencies, transportation industry as well as the end-users. This has raised interests in improving the fuel economy of road vehicles. One of the promising technologies in this regard is hybridization of vehicle transmission. Hydraulic hybrids have progressively gained acceptance due to their high power density and low component costs relative to their electric counterpart.

Many different hydraulic hybrid architectures have been developed to achieve better power management and regenerative braking and have been tested for performance and …

An Automated Syringe Pump System For Improving The Reproducibility Of Dynamic Hyperpolarized Mri Phantoms, Harlee G. Harrison

Dissertations & Theses (Open Access)

AN AUTOMATED SYRINGE PUMP SYSTEM FOR IMPROVING THE REPRODUCIBILITY OF DYNAMIC HYPERPOLARIZED MRI PHANTOMS

Harlee Grace Harrison, B.S.

Advisory Professor: James Bankson, Ph.D.

Magnetic Resonance Imaging (MRI) is a powerful tool in the diagnosis of cancer due to its ability to provide good soft tissue contrast and image resolution without the use of ionizing radiation. The use of hyperpolarized pyruvate as a contrast agent for tumor metabolism during MR scans has the potential to provide information about tumor metabolism in vivo that is not available from traditional imaging measurements or any other method. Hyperpolarization is achieved through dynamic nuclear polarization. …

Effects Of Hydraulic Pressure On Wrinkling And Earing In Micro Hydro Deep Drawing Of Sus304 Circular Cups, Liang Luo, Dongbin Wei, Xiaogang Wang, Cunlong Zhou, Qingxue Huang, Jianzhong Xu, Di Wu, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part A

Influences of hydraulic pressure on forming features in micro hydro deep drawing are different from those in normal drawing due to the small size of specimens. In this study, micro hydro deep drawing of SUS304 sheets was carried out in order to study the impacts of the hydraulic pressure on the quality of the drawn cup. Experimental results indicate that there is a critical hydraulic pressure range from 3 to 6 % of the blank's initial yield stress, where wrinkling and earing development trends change twice. The wrinkling and the earing of the drawn cup also reach their local extremes …

Mechanical Characterization Of Sicf-Sicm Nuclear Fuel Cladding By A Novel Hydraulic Internal Pressurization Method, Kirill Shapovalov

Theses and Dissertations

Ceramic Matrix Composites (CMC) have been actively researched for applications requiring high temperature strength and damage tolerance. Examples are turbine engine hot section components, leading edges for hypersonic vehicles, nuclear fusion reactor first wall and blanket, and recently nuclear fuel claddings. Predictable material damage behavior is desirable for these applications so early damage accumulation can be detected before a catastrophic failure occurs. Many ceramic materials can withstand high temperature environments, but due to inherent brittleness of ceramics the high damage tolerance and the predictable damage behavior are difficult to achieve. Ceramic fiber reinforced ceramic composites (CFCC) have demonstrated the above …

Hydraulic Conductivity As A Proxy For Drainage System Connectivity In A Subglacial Hydrology Model, Jacob Z. Downs

Graduate Student Theses, Dissertations, & Professional Papers

The link between subglacial hydrology and basal sliding has prompted work on basal hydrology models with water pressure and storage as prognostic variables. We find that a commonly used model of distributed drainage through linked cavities underpredicts winter water pressure when compared to borehole observations from Issunguata Sermia in Western Central Greenland. Possible causes for this discrepancy including unrealistic model inputs or unconstrained parameters are investigated through a series of modeling experiments on both synthetic and realistic ice sheet geometries. We find that conductivity acts as a proxy for the connectivity of the linked cavity system and should therefore change …

Occupational Silica Exposure For The Fuel Distributing Company On Hydraulic Fracturing Locations, Caleb Moore

Graduate Theses & Non-Theses

This report investigates the potential exposure to respirable crystalline silica experienced by fuel distributing employees on hydraulic fracturing locations. Hydraulic fracturing is an oil and gas technique used to develop shale formations all across the United States of America. This is done by injecting large volumes of water, sand, and treatment chemicals under high pressure into oil wells within the shale formation. This well stimulation is possible due to the high pressure of the fluid, which creates and opens cracks and fissures in the formation. The sand contained inside the fluid flows into these opened fissures and becomes wedged, holding …

Fracking And The Rural Poor: Negative Externalities, Failing Remedies, And Federal Legislation, Matthew Castelli

Indiana Journal of Law and Social Equality

This Note examines the relationship between the rural poor and the negative externalities of hydraulic fracturing (“fracking”). It asserts that the rural poor are disproportionately burdened with fracking’s negative externalities and that comprehensive, national regulation is needed because current legal methods are insufficient to internalize these costs. The argument is made in four parts: describing fracking’s externalities; assessing their impact on the rural poor; analyzing current legal regimes; and proposing an equitable regulatory framework based on cooperative federalism.

Fracking produces three main categories of negative externalities: water, air, and land contamination. Water contamination can be caused by migration of fracking …

Sustainable Finance - A Blueprint For Severance Taxes In The Marcellus Shale, Ryan Pulver

Kentucky Journal of Equine, Agriculture, & Natural Resources Law

No abstract provided.

The Effect Of Geometry And Material Properties On The Performance Of A Small Hydraulic Mckibben Muscle System, Danial Sangian, Sina Naficy, Geoffrey M. Spinks, Bertrand Tondu

Faculty of Engineering and Information Sciences - Papers: Part A

Fluidic McKibben artificial muscles are one of the most popular biomimetic actuators, showing similar static and dynamic performance to skeletal muscles. In particular, their pneumatic version offers high-generated force, high speed and high strain in comparison to other actuators. This paper investigates the development of a small-size, fully enclosed, hydraulic McKibben muscle powered by a low voltage pump. Hydraulic McKibben muscles with an outside diameter of 6 mm and a length ranging from 35 mm to 80 mm were investigated. These muscles are able to generate forces up to 26 N, strains up to 23%, power to mass of 30 …

High Resolution Bathymetric Lidar Data To Hydraulic - Modelling A Mountain Stream By Bathymetric Lidar Data, Wolfgang Dobler, Frank Steinbacher, Ramona Baran, Markus Aufleger

International Conference on Hydroinformatics

Knowledge about the hydraulic situation in a mountain torrent is relevant to quantify flood risks, to study sediment transport and to assess the waterbodies’ ecology. To conduct reliable calculations, high-quality terrain data of riverbeds, riverbanks and floodplains are required. Typically, digital terrain models (DTMs) of floodplains are derived from classical airborne laserscanning (red wavelength) together with terrestrial surveys along riverbeds and riverbanks. Usually these are restricted to a limited number of cross sections. The terrestrial surveys are necessary because those laser systems cannot penetrate through the water column of the observed waterbodies. Consequently, data for the geometry of riverbeds and …

Hydraulic Fracturing And The Baseline Testing Of Groundwater, Keith B. Hall

University of Richmond Law Review

This article discusses some of the legal and practical issues relating to baseline testing of groundwater and the rules designed to encourage or require such testing. Part I of the article discusses basic background material why this issue is important, what fracturing is and why it is used, the basic types of fracturing, why it can be challenging to determine the cause of alleged contamination, and why baseline testing might help. Part II examines different approaches to increasing the use of baseline testing, including regulations that require such testing and legislation that creates presumptions that provide incentives to conduct such …