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2019

Michigan Technological University

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Articles 1 - 30 of 69

Full-Text Articles in Engineering

High-Temperature Performance Of Polymer-Modified Asphalt Mixes: Preliminary Evaluation Of The Usefulness Of Standard Technical Index In Polymer-Modified Asphalt., Kezhen Yan, Lingyun You, Daocheng Wang Aug 2019

High-Temperature Performance Of Polymer-Modified Asphalt Mixes: Preliminary Evaluation Of The Usefulness Of Standard Technical Index In Polymer-Modified Asphalt., Kezhen Yan, Lingyun You, Daocheng Wang

Michigan Tech Publications

The objectives of this study are to evaluate the high-temperature performance of polymer-modified asphalt and asphalt mixtures, and to investigate if the standard technical indexes are useful in the performance evaluation of the polymer-modified asphalt. There are four typically used polymer-modified asphalt types employed in the study. The standard high-temperature rheological test, such as the temperature sweep test, was used to express the high-temperature performance of the polymer-modified asphalt. Also, considering the non-Newtonian fluid properties of the polymer-modified asphalt, the multiple stress creep recovery (MSCR) and zero-shear viscosity (ZSV) tests were employed for the characterizations. Besides, based on the mixture ...


Stability Analysis On Nonequilibrium Supersonic Boundary Layer Flow With Velocity-Slip Boundary Conditions, Xin He, Chunpei Cai Jul 2019

Stability Analysis On Nonequilibrium Supersonic Boundary Layer Flow With Velocity-Slip Boundary Conditions, Xin He, Chunpei Cai

Michigan Tech Publications

This paper presents our recent work on investigating velocity slip boundary conditions’ effects on supersonic flat plate boundary layer flow stability. The velocity-slip boundary conditions are adopted and the flow properties are obtained by solving boundary layer equations. Stability analysis of two such boundary layer flows is performed by using the Linear stability theory. A global method is first utilized to obtain approximate discrete mode values. A local method is then utilized to refine these mode values. All the modes in these two scenarios have been tracked upstream-wisely towards the leading edge and also downstream-wisely. The mode values for the ...


Thermal Conduction Simulation Based On Reconstruction Digital Rocks With Respect To Fractures, Haiyuan Yang, Li Zhang, Ronghe Liu, Xianli Wen, Yongfei Yang, Roohollah Askari, Et. Al. Jul 2019

Thermal Conduction Simulation Based On Reconstruction Digital Rocks With Respect To Fractures, Haiyuan Yang, Li Zhang, Ronghe Liu, Xianli Wen, Yongfei Yang, Roohollah Askari, Et. Al.

Michigan Tech Publications

Effective thermal conductivity (ETC), as a necessary parameter in the thermal properties of rock, is affected by the pore structure and the thermal conduction conditions. To evaluate the effect of fractures and saturated fluids on sandstone’s thermal conductivity, we simulated thermal conduction along three orthogonal (X, Y, and Z) directions under air- and water-saturated conditions on reconstructed digital rocks with different fractures. The results show that the temperature distribution is separated by the fracture. The significant difference between the thermal conductivities of solid and fluid is the primary factor influencing the temperature distribution, and the thermal conduction mainly depends ...


Electro-Optic Modulator, Microwave Photonic Link Including An Electro-Optic Modulator, And Method Of Communicating A Signal With An Electro-Optic Modulator, Christopher T. Middlebrook, Arash Hosseinzadeh Jul 2019

Electro-Optic Modulator, Microwave Photonic Link Including An Electro-Optic Modulator, And Method Of Communicating A Signal With An Electro-Optic Modulator, Christopher T. Middlebrook, Arash Hosseinzadeh

Michigan Tech Patents

An electro-optic modulator coupled to an optical source providing an optical power and a radio frequency source providing a radio frequency power. The electro-optic modulator includes a waveguide to receive the optical power, a first ring resonator modulator, and a second ring resonator modulator. The first ring resonator modulator and the second ring resonator modulator receives the radio frequency power, and are coupled to the waveguide for modulating the optical power with the radio frequency power. The first ring resonator modulator and the second ring resonator modulator, with the waveguide, substantially suppress third order intermodulation distortion of a combined power ...


Pseudo-Spectral Method To Control Three-Degree-Of-Freedom Wave Energy Converters, Ossama Abdelkhalik, Giorgio Bacelli, Shangyan Zou, Rush D. Robinett Iii, David G. Wilson, Ryan G. Coe Jul 2019

Pseudo-Spectral Method To Control Three-Degree-Of-Freedom Wave Energy Converters, Ossama Abdelkhalik, Giorgio Bacelli, Shangyan Zou, Rush D. Robinett Iii, David G. Wilson, Ryan G. Coe

Michigan Tech Patents

The invention provides optimal control of a three-degree-of-freedom wave energy converter using a pseudo-spectral control method. The three modes are the heave, pitch and surge. A dynamic model is characterized by a coupling between the pitch and surge modes, while the heave is decoupled. The heave, however, excites the pitch motion through nonlinear parametric excitation in the pitch mode. The invention can use a Fourier series as basis functions to approximate the states and the control. For the parametric excited case, a sequential quadratic programming approach can be implemented to numerically solve for the optimal control. The numerical results show ...


Generating Electrospray From A Ferrofluid, Lyon Bradley King Jun 2019

Generating Electrospray From A Ferrofluid, Lyon Bradley King

Michigan Tech Patents

An electrospray device for generating electrospray from a ferrofluid. The electrospray device includes an emitter, an extraction electrode, and a magnet. The emitter is configured to receive a ferrofluidic liquid. The extraction electrode includes an aperture and is positioned a first distance from the emitter. The magnet generates a magnetic field in a first direction toward the emitter. The magnetic field causes Rosensweig instability in the ferrofluidic liquid, and generates a ferrofluidic peak in the ferrofluidic liquid. The magnet is positioned a second distance from the emitter, and the emitter is positioned between the extraction electrode and the magnet. The ...


Neural Network-Based Diagnostic Tool For Detecting Stator Inter-Turn Faults In Line Start Permanent Magnet Synchronous Motors, Luqman S. Maraaba, Zakariya M. Al-Hamouz, Abdulaziz S. Milhem, M. A. Abido Jun 2019

Neural Network-Based Diagnostic Tool For Detecting Stator Inter-Turn Faults In Line Start Permanent Magnet Synchronous Motors, Luqman S. Maraaba, Zakariya M. Al-Hamouz, Abdulaziz S. Milhem, M. A. Abido

Michigan Tech Publications

Three-phase line-start permanent magnet synchronous motors are considered among the most promising types of motors in industrial applications. However, these motors experience several faults, which may cause significant financial losses. This paper proposed a feed-forward neural network-based diagnostic tool for accurate and fast detection of the location and severity of stator inter-turn faults. The input to the neural network is a group of representative statistical and frequency-based features extracted from the steady-state three-phase stator current signals. The current signals with different numbers of shorted turns and loading conditions are captured using the developed finite element JMAG ™ model for interior mount ...


Correction: Responses Of Deposition And Bioaccumulation In The Great Lakes Region To Policy And Other Large-Scale Drivers Of Mercury Emissions, Judith Perlinger, N. R. Urban, A. Giang, N. E. Selin, A. Hendricks, H. Zhang, Aditya Kumar, S. Wu, Valoree Gagnon, Hugh Gorman, E. S. Norman Jun 2019

Correction: Responses Of Deposition And Bioaccumulation In The Great Lakes Region To Policy And Other Large-Scale Drivers Of Mercury Emissions, Judith Perlinger, N. R. Urban, A. Giang, N. E. Selin, A. Hendricks, H. Zhang, Aditya Kumar, S. Wu, Valoree Gagnon, Hugh Gorman, E. S. Norman

Michigan Tech Publications

Correction for ‘Responses of deposition and bioaccumulation in the Great Lakes region to policy and other large-scale drivers of mercury emissions’ by J. A. Perlinger et al., Environ. Sci.: Processes Impacts, 2018, 20, 195–209.

In the original article, there were errors in some numerical values in Table 3 and in the text in Sections 3.1 and 4.1. The corrected Table and Sections are shown below. The changes are to the magnitudes of mercury species deposition to the Great Lakes region, the Upper Peninsula of Michigan, and the Adirondack region of the Lakes basin. The changes to the ...


Mapping Modeled Exposure Of Wildland Fire Smoke For Human Health Studies In California, Patricia Koman, Michael Billmire, Kirk Baker, Ricardo De Majo, Frank Anderson, Sumi Hoshiko, Brian Thelen, Nancy H. F. French Jun 2019

Mapping Modeled Exposure Of Wildland Fire Smoke For Human Health Studies In California, Patricia Koman, Michael Billmire, Kirk Baker, Ricardo De Majo, Frank Anderson, Sumi Hoshiko, Brian Thelen, Nancy H. F. French

Michigan Tech Publications

Wildland fire smoke exposure affects a broad proportion of the U.S. population and is increasing due to climate change, settlement patterns and fire seclusion. Significant public health questions surrounding its effects remain, including the impact on cardiovascular disease and maternal health. Using atmospheric chemical transport modeling, we examined general air quality with and without wildland fire smoke PM2.5. The 24-h average concentration of PM2.5 from all sources in 12-km gridded output from all sources in California (2007–2013) was 4.91 μg/m3. The average concentration of fire-PM2.5 in California by year ...


Mechanical Properties And Applications Of Recycled Polycarbonate Particle Material Extrusion-Based Additive Manufacturing, Matthew J. Reich, Aubrey Woern, Nagendra Gautam Tanikella, Joshua M. Pearce May 2019

Mechanical Properties And Applications Of Recycled Polycarbonate Particle Material Extrusion-Based Additive Manufacturing, Matthew J. Reich, Aubrey Woern, Nagendra Gautam Tanikella, Joshua M. Pearce

Michigan Tech Publications

Past work has shown that particle material extrusion (fused particle fabrication (FPF)/fused granular fabrication (FGF)) has the potential for increasing the use of recycled polymers in 3D printing. This study extends this potential to high-performance (high-mechanical-strength and heat-resistant) polymers using polycarbonate (PC). Recycled PC regrind of approximately 25 mm2 was 3D printed with an open-source Gigabot X and analyzed. A temperature and nozzle velocity matrix was used to find useful printing parameters, and a print test was used to maximize the output for a two-temperature stage extruder for PC. ASTM type 4 tensile test geometries as well as ...


Agent-Based Microgrid Architecture For Generation Following Protocols, Steven Goldsmith May 2019

Agent-Based Microgrid Architecture For Generation Following Protocols, Steven Goldsmith

Michigan Tech Patents

A system for predicting power and loads over a single, relatively short time horizon. More specifically, a system comprising a Storage Agent (S-agent) Cohort within a grid control society, wherein the system expands G and L intra-cohort protocols to allow the S-cohort to participate in power management of the grid by scheduling storage components in source or load roles as determined by the time-varying state of the power imbalance and by the risk-adjusting capacity margin relationship between the G and L cohorts.


Management Transition To The Great Lakes Nearshore: Insights From Hydrodynamic Modeling, Chenfu Huang, Anika Kuczynski, Martin T. Auer, David M. O'Donnell, Pengfei Xue May 2019

Management Transition To The Great Lakes Nearshore: Insights From Hydrodynamic Modeling, Chenfu Huang, Anika Kuczynski, Martin T. Auer, David M. O'Donnell, Pengfei Xue

Department of Civil and Environmental Engineering Publications

The emerging shift in Great Lakes management from offshore to nearshore waters will require attention to complexities of coastal hydrodynamics and biogeochemical transformations. Emphasizing hydrodynamics, this work resolves transport processes in quantifying discharge plume and pollutant of concern (POC) footprint dimensions, the latter being the portion of the plume where water quality standards are not met. A generic approach, isolated from pollutant-specific biokinetics, provides first-approximation estimates of the footprint area. A high-resolution, linked hydrodynamic-tracer model is applied at a site in the Greater Toronto Area on Lake Ontario. Model results agree with observed meteorological and hydrodynamic conditions and satisfactorily simulate ...


Management Transition To The Great Lakes Nearshore: Insights From Hydrodynamic Modeling, Chenfu Huang, Anika Kuczynski, Martin Auer, David M. O'Donnell, Pengfui Xue May 2019

Management Transition To The Great Lakes Nearshore: Insights From Hydrodynamic Modeling, Chenfu Huang, Anika Kuczynski, Martin Auer, David M. O'Donnell, Pengfui Xue

Michigan Tech Publications

The emerging shift in Great Lakes management from offshore to nearshore waters will require attention to complexities of coastal hydrodynamics and biogeochemical transformations. Emphasizing hydrodynamics, this work resolves transport processes in quantifying discharge plume and pollutant of concern (POC) footprint dimensions, the latter being the portion of the plume where water quality standards are not met. A generic approach, isolated from pollutant-specific biokinetics, provides first-approximation estimates of the footprint area. A high-resolution, linked hydrodynamic-tracer model is applied at a site in the Greater Toronto Area on Lake Ontario. Model results agree with observed meteorological and hydrodynamic conditions and satisfactorily simulate ...


Systems Analysis For Pet And Olefin Polymers In A Circular Economy, David R. Shonnard, Emily Tipaldo, Vicki Thompson, Joshua M. Pearce, Gerard T. Caneba, Robert Handler May 2019

Systems Analysis For Pet And Olefin Polymers In A Circular Economy, David R. Shonnard, Emily Tipaldo, Vicki Thompson, Joshua M. Pearce, Gerard T. Caneba, Robert Handler

Michigan Tech Publications

Polyethylene terephthalate (PET #1) and polyolefin plastics such polyethylene (HDPE #2, LDPE #4) and polypropylene (PP #5) are major products from the chemical industry, and they comprise a significant fraction of municipal solid waste that ends up in landfills or as litter and marine debris. The reuse of these polymeric materials can be optimized through systems analysis with a view on materials flow analysis, techno-economics, environmental life cycle assessment, and consequential societal impacts. This contribution will present the overall research approach for this exploratory project within the DOE- and industry-funded REMADE Institute and end with a proposed systems analysis framework.


Capillary Penetration Method For Measuring Wetting Properties Of Carbon Ionomer Films For Proton Exchange Membrane Fuel Cell (Pemfc) Applications, Sofyane Abbou, Kazuya Tajiri, K. T. Alofari, Ezequiel F. Medici, A. T. Haug, Jeffrey S. Allen Apr 2019

Capillary Penetration Method For Measuring Wetting Properties Of Carbon Ionomer Films For Proton Exchange Membrane Fuel Cell (Pemfc) Applications, Sofyane Abbou, Kazuya Tajiri, K. T. Alofari, Ezequiel F. Medici, A. T. Haug, Jeffrey S. Allen

Michigan Tech Publications

In this work, capillary rise experiments were performed to assess the wetting properties of carbon-ionomer (CI) films. The samples were attached to a micro-balance and then immersed into liquid water to (i) measure the mass gain from the liquid uptake and (ii) estimate the (external) contact angle to water (typical value around 140°). The results showed that drying the CI films under low vacuum significantly impacted the CI film wettability. The influence of the ionomer content on the CI films’ wettability was investigated with various ionomer to carbon (I/C) ratios: 0.8, 1.0, 1.2 and 1.4 ...


Preliminary Automated Determination Of Edibility Of Alternative Foods: Non-Targeted Screening For Toxins In Red Maple Leaf Concentrate, Joshua M. Pearce, Maryam Khaksari, David C. Denkenberger Apr 2019

Preliminary Automated Determination Of Edibility Of Alternative Foods: Non-Targeted Screening For Toxins In Red Maple Leaf Concentrate, Joshua M. Pearce, Maryam Khaksari, David C. Denkenberger

Department of Materials Science and Engineering Publications

Alternative food supplies could maintain humanity despite sun-blocking global catastrophic risks (GCRs) that eliminate conventional agriculture. A promising alternative food is making leaf concentrate. However, the edibility of tree leaves is largely uncertain. To overcome this challenge, this study provides the methods for obtaining rapid toxics screening of common leaf concentrates. The investigation begins with a non-targeted approach using an ultra-high-resolution hybrid ion trap orbitrap mass spectrometer with electrospray ionization (ESI) coupled to an ultra-high pressure two-dimensional liquid chromatograph system on the most common North American leaf: the red maple. Identified chemicals from this non-targeted approach are then cross-referenced with ...


Preliminary Automated Determination Of Edibility Of Alternative Foods: Non-Targeted Screening For Toxins In Red Maple Leaf Concentrate, Joshua M. Pearce, Maryam Khaksari, David C. Denkenberger Apr 2019

Preliminary Automated Determination Of Edibility Of Alternative Foods: Non-Targeted Screening For Toxins In Red Maple Leaf Concentrate, Joshua M. Pearce, Maryam Khaksari, David C. Denkenberger

Michigan Tech Publications

Alternative food supplies could maintain humanity despite sun-blocking global catastrophic risks (GCRs) that eliminate conventional agriculture. A promising alternative food is making leaf concentrate. However, the edibility of tree leaves is largely uncertain. To overcome this challenge, this study provides the methods for obtaining rapid toxics screening of common leaf concentrates. The investigation begins with a non-targeted approach using an ultra-high-resolution hybrid ion trap orbitrap mass spectrometer with electrospray ionization (ESI) coupled to an ultra-high pressure two-dimensional liquid chromatograph system on the most common North American leaf: the red maple. Identified chemicals from this non-targeted approach are then cross-referenced with ...


Bathymetric Surveying In Lake Superior: 3d Modeling And Sonar Equipment Comparing, Eugene Levin, Guy Meadows, Roman Shults, Utku Karacelebi, Hasan Salih Kulunk Apr 2019

Bathymetric Surveying In Lake Superior: 3d Modeling And Sonar Equipment Comparing, Eugene Levin, Guy Meadows, Roman Shults, Utku Karacelebi, Hasan Salih Kulunk

School of Technology Publications

This paper represents the overview of hydrographic surveying and different types of modern and traditional surveying equipment, and data acquisition using the traditional single beam sonar system and a modern fully autonomous underwater vehicle (AUV) IVER3. During the study, the data sets were collected using the vehicles of the Great Lake Research Center at Michigan Technological University. This paper presents how to process and edit the bathymetric data on SonarWiz5. Lastly, it compares the accuracy of the two different sonar systems in the different missions and creates 3D models to display and understand the elevations changes. Moreover, the 3D models ...


Comparative Study Of Ethanol Foamed Asphalt Binders And Mixtures Prepared Via Manual Injection And Laboratory Foaming Device, Mohd Rosli Mohd Hasan, Zhanping You Apr 2019

Comparative Study Of Ethanol Foamed Asphalt Binders And Mixtures Prepared Via Manual Injection And Laboratory Foaming Device, Mohd Rosli Mohd Hasan, Zhanping You

Michigan Tech Publications

The consistency of the ethanol foamed binders and mixtures prepared using asphalt binders foamed by the manual injection technique and laboratory foaming device were evaluated and compared in this study. The asphalt binders foamed using both methods was prepared at 120 °C, 130 °C and 140 °C. The performance of ethanol-foamed binders was evaluated in terms of rotational viscosity, expansion ratio, and low temperature cracking. Meanwhile, the performance of foamed WMA mixtures was tested using semi-circular bending (SCB), disk-shaped compact tension (DCT), and tensile strength ratio (TSR) tests. In order to conduct the TSR test, the samples were conditioned using ...


Moisture Susceptibility Of Warm Mix Asphalt (Wma) With An Organic Wax Additive Based On X-Ray Computed Tomography (Ct) Technology, Jie Ji, Zhikai Yuan, Zhi Suo, Ying Xu, Pengfei Li, Zhanping You Apr 2019

Moisture Susceptibility Of Warm Mix Asphalt (Wma) With An Organic Wax Additive Based On X-Ray Computed Tomography (Ct) Technology, Jie Ji, Zhikai Yuan, Zhi Suo, Ying Xu, Pengfei Li, Zhanping You

Department of Civil and Environmental Engineering Publications

The warm mix asphalt was fabricated with different moisture contents (0%, 1%, 2%, and 3%) of limestone aggregates using the Superpave gyratory compactor. The moisture susceptibility of asphalt mixtures with an organic wax additive RH was studied. The samples were compacted and tested using the modified Lottman test AASHTO T283, and the X-ray computed tomography technology was used to capture the internal structure images before and after the freeze-thaw cycles. The test results show that the air voids were distributed in the size range of 0–5 mm3 and 5–10 mm3. The number of air voids decreased ...


A Discrete Curvature Estimation Based Low-Distortion Adaptive Savitzky-Golay Filter For Ecg Denoising, Hui Huang, Shiyan Hu, Ye Sun Apr 2019

A Discrete Curvature Estimation Based Low-Distortion Adaptive Savitzky-Golay Filter For Ecg Denoising, Hui Huang, Shiyan Hu, Ye Sun

Department of Mechanical Engineering-Engineering Mechanics Publications

Electrocardiogram (ECG) sensing is an important application for the diagnosis of cardiovascular diseases. Recently, driven by the emerging technology of wearable electronics, massive wearable ECG sensors are developed, which however brings additional sources of noise contamination on ECG signals from these wearable ECG sensors. In this paper, we propose a new low-distortion adaptive Savitzky-Golay (LDASG) filtering method for ECG denoising based on discrete curvature estimation, which demonstrates better performance than the state of the art of ECG denoising. The standard Savitzky-Golay (SG) filter has a remarkable performance of data smoothing. However, it lacks adaptability to signal variations and thus often ...


Lowering Emissivity Of Concrete Roof Tile's Underside Cuts Down Heat Entry To The Building, Xuejun Chen, Lei Wang, Zhikui Liu, Yinghong Qin, Ting Bao Apr 2019

Lowering Emissivity Of Concrete Roof Tile's Underside Cuts Down Heat Entry To The Building, Xuejun Chen, Lei Wang, Zhikui Liu, Yinghong Qin, Ting Bao

Department of Civil and Environmental Engineering Publications

Buildings in Southern China widely use a double-skin roof to reduce heat entry through the roof to the building interior during summertime. Concrete roof tiles are preferably installed as the outmost layer of the double-skin roof due to their resistance to hail and wind damages and their attractive price. However, after construction, the tile’s top tends to be darkened by dust deposit and algae growth, increasing the heat entry through the roof to the building. Here, we show that this heat entry can be curtailed by lowering the emissivity at the tile’s underside. Temperatures and heat fluxes at ...


A Discrete Curvature Estimation Based Low-Distortion Adaptive Savitzky⁻Golay Filter For Ecg Denoising., Hui Huang, Shiyan Hu, Ye Sun Apr 2019

A Discrete Curvature Estimation Based Low-Distortion Adaptive Savitzky⁻Golay Filter For Ecg Denoising., Hui Huang, Shiyan Hu, Ye Sun

Michigan Tech Publications

Electrocardiogram (ECG) sensing is an important application for the diagnosis of cardiovascular diseases. Recently, driven by the emerging technology of wearable electronics, massive wearable ECG sensors are developed, which however brings additional sources of noise contamination on ECG signals from these wearable ECG sensors. In this paper, we propose a new low-distortion adaptive Savitzky-Golay (LDASG) filtering method for ECG denoising based on discrete curvature estimation, which demonstrates better performance than the state of the art of ECG denoising. The standard Savitzky-Golay (SG) filter has a remarkable performance of data smoothing. However, it lacks adaptability to signal variations and thus often ...


Could 79 People Solarize The U.S. Electric Grid?, Joshua M. Pearce, Emily Prehoda Mar 2019

Could 79 People Solarize The U.S. Electric Grid?, Joshua M. Pearce, Emily Prehoda

Department of Materials Science and Engineering Publications

Although wealth inequality has many established negatives, this study investigates a potential positive, unprecedented wealth concentration makes it possible for solutions to large and seemingly intractable problems to be deployed by convincing a relatively small number of individuals to invest. In order to probe this potential outcome of inequality, this study quantifies the number of people necessary to radically reduce the greenhouse gas emissions responsible for global climate destabilization from the U.S. electric grid, which is one of the largest sources of emissions. Specifically, this study determined that 1544 GW of solar photovoltaic (PV) technology must be deployed to ...


Mechanical Properties Of Michigan Basin's Gypsum Before And After Saturation, Mohammadhossein Sadeghiamirshahidi, Stanley Vitton Mar 2019

Mechanical Properties Of Michigan Basin's Gypsum Before And After Saturation, Mohammadhossein Sadeghiamirshahidi, Stanley Vitton

Michigan Tech Publications

The stability analysis of an abandoned underground gypsum mine requires the determination of the mine pillar's strength. This is especially important for flooded abandoned mines where the gypsum pillars become saturated and are subjected to dissolution after flooding. Further, mine pillars are subjected to blast vibrations that generate some level of macro- and micro-fracturing. Testing samples of gypsum must, therefore, simulate these conditions as close as possible. In this research, the strength of gypsum is investigated in an as-received saturated condition using uniaxial compressive strength (UCS), Brazilian tensile strength (BTS) and point load index (PLI) tests. The scale effect ...


A Novel Correlation Model For Horizontal Axis Wind Turbines Operating At High-Interference Flow Regimes, Anurag Rajan, Fernando L. Ponta Mar 2019

A Novel Correlation Model For Horizontal Axis Wind Turbines Operating At High-Interference Flow Regimes, Anurag Rajan, Fernando L. Ponta

Department of Mechanical Engineering-Engineering Mechanics Publications

Driven by economics-of-scale factors, wind-turbine rotor sizes have increased formidably in recent years. Larger rotors with lighter blades of increased flexibility will experiment substantially higher levels of deformation. Future turbines will also incorporate advanced control strategies to widen the range of wind velocities over which energy is captured. These factors will extend turbine operational regimes, including flow states with high interference factors. In this paper we derive a new empirical relation to both improve and extend the range of Blade Element Momentum (BEM) models, when applied to high interference-factor regimes. In most BEM models, these flow regimes are modeled using ...


Unified Strength Model Of Asphalt Mixture Under Various Loading Modes, Chengdong Xia, Songtao Lv, Lingyun You, Dong Chen, Yipeng Li, Jianlong Zheng Mar 2019

Unified Strength Model Of Asphalt Mixture Under Various Loading Modes, Chengdong Xia, Songtao Lv, Lingyun You, Dong Chen, Yipeng Li, Jianlong Zheng

Department of Civil and Environmental Engineering Publications

Although the rutting resistance, fatigue cracking, and the resistance to water and frost are important for the asphalt pavement, the strength of asphalt mixture is also an important factor for the asphalt mixture design. The strength of asphalt mixture is directly associated with the overall performance of asphalt mixture. As a top layer material of asphalt pavement, the strength of asphalt mixture plays an indispensable role in the top structural bearing layer. In the present design system, the strength of asphalt pavement is usually achieved via the laboratory tests. The stress states are usually different for the different laboratory approaches ...


Evaluation Of Photogrammetry And Inclusion Of Control Points: Significance For Infrastructure Monitoring, Renee Oats, Rudiger Escobar-Wolf, Thomas Oommen Mar 2019

Evaluation Of Photogrammetry And Inclusion Of Control Points: Significance For Infrastructure Monitoring, Renee Oats, Rudiger Escobar-Wolf, Thomas Oommen

Department of Civil and Environmental Engineering Publications

Structure from Motion (SfM)/Photogrammetry is a powerful mapping tool in extracting three-dimensional (3D) models from photographs. This method has been applied to a range of applications, including monitoring of infrastructure systems. This technique could potentially become a substitute, or at least a complement, for costlier approaches such as laser scanning for infrastructure monitoring. This study expands on previous investigations, which utilize photogrammetry point cloud data to measure failure mode behavior of a retaining wall model, emphasizing further robust spatial testing. In this study, a comparison of two commonly used photogrammetry software packages was implemented to assess the computing performance ...


Polydopamine And Collagen Coated Micro-Grated Polydimethylsiloxane For Human Mesenchymal Stem Cell Culture, Dhavan Sharma, Wenkai Jia, Fei Long, Shweta Pati, Qing-Hui Chen, Yibing Qyang, Bruce P. Lee, Chang Kyoung Choi, Feng Zhao Feb 2019

Polydopamine And Collagen Coated Micro-Grated Polydimethylsiloxane For Human Mesenchymal Stem Cell Culture, Dhavan Sharma, Wenkai Jia, Fei Long, Shweta Pati, Qing-Hui Chen, Yibing Qyang, Bruce P. Lee, Chang Kyoung Choi, Feng Zhao

Department of Biomedical Engineering Publications

Natural tissues contain highly organized cellular architecture. One of the major challenges in tissue engineering is to develop engineered tissue constructs that promote cellular growth in physiological directionality. To address this issue, micro-patterned polydimethylsiloxane (PDMS) substrates have been widely used in cell sheet engineering due to their low microfabrication cost, higher stability, excellent biocompatibility, and most importantly, ability to guide cellular growth and patterning. However, the current methods for PDMS surface modification either require a complicated procedure or generate a non-uniform surface coating, leading to the production of poor-quality cell layers. A simple and efficient surface coating method is critically ...


A Hamiltonian Surface-Shaping Approach For Control System Analysis And The Design Of Nonlinear Wave Energy Converters, Shadi Darani, Ossama Abdelkhalik, Rush D. Robinett Iii, David Wilson Feb 2019

A Hamiltonian Surface-Shaping Approach For Control System Analysis And The Design Of Nonlinear Wave Energy Converters, Shadi Darani, Ossama Abdelkhalik, Rush D. Robinett Iii, David Wilson

Department of Mechanical Engineering-Engineering Mechanics Publications

The dynamic model of Wave Energy Converters (WECs) may have nonlinearities due to several reasons such as a nonuniform buoy shape and/or nonlinear power takeoff units. This paper presents the Hamiltonian Surface-Shaping (HSS) approach as a tool for the analysis and design of nonlinear control of WECs. The Hamiltonian represents the stored energy in the system and can be constructed as a function of the WEC’s system states, its position, and velocity. The Hamiltonian surface is defined by the energy storage, while the system trajectories are constrained to this surface and determined by the power flows of the ...