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Articles 1 - 8 of 8
Full-Text Articles in Engineering
Development Of A Multiphase Photon Monte Carlo Method For Spray Combustion And Its Application In High-Pressure Conditions, Somesh Roy, Jian Cai, Michael F. Modest
Development Of A Multiphase Photon Monte Carlo Method For Spray Combustion And Its Application In High-Pressure Conditions, Somesh Roy, Jian Cai, Michael F. Modest
Mechanical Engineering Faculty Research and Publications
In this work the development of a multiphase photon Monte Carlo (PMC) method with a focus on resolving radiative heat transfer in combustion simulations is presented. The multiphase PMC solver can account for description of participating media in both Lagrangian and Eulerian frameworks. The solver is validated against exact solutions in several one-dimensional configurations. The developed solver is then applied to Diesel spray combustions, where liquid spray droplets are assumed to be cold, nonemitting, large, and isotropically scattering. Several formulations for radiative properties of the Diesel spray are first explored. The PMC solver has then been coupled with the multiphase …
A Comparison Of Sensitivity Metrics For Two-Stage Ignition Behavior In Rapid Compression Machines, David Wilson, Casey Allen
A Comparison Of Sensitivity Metrics For Two-Stage Ignition Behavior In Rapid Compression Machines, David Wilson, Casey Allen
Mechanical Engineering Faculty Research and Publications
A rapid compression machine (RCM) multi-zone model is used to simulate the ignition of primary reference fuel (PRF) mixtures that exhibit two-stage ignition behavior. Sensitivity coefficients for each reaction in the PRF mechanism are calculated from four different metrics: (1) first-stage energy release, (2) first-stage pressure rise, (3) first-stage ignition delay time, and (4) total ignition delay time. The sensitivity coefficients are used to provide four unique rankings, and the rankings are compared using Spearman’s rank correlation coefficient. Special emphasis is given to comparing the rankings based on first-stage energy release and total ignition delay time. The level of agreement …
A Bayesian Estimation Model For Transient Engine Exhaust Characterization Using Fourier Transform Infrared Spectroscopy, David Wilson, Casey Allen
A Bayesian Estimation Model For Transient Engine Exhaust Characterization Using Fourier Transform Infrared Spectroscopy, David Wilson, Casey Allen
Mechanical Engineering Faculty Research and Publications
Comprehensive emissions models extensively use engine exhaust data from vehicle experiments to represent the relationship between fuel composition and pollutants. However, the predicted emissions from these models often neglect the effects of transients and speed-load history. Fourier transform infrared (FTIR) spectroscopy is a high frequency measurement technique capable of comprehensive speciation. However, due to long residence times of exhaust within a FTIR spectrometer gas cell, FTIR measurements are contaminated by the effects of historical emissions, precluding the attainment of time-resolved engine exhaust data. This work presents a Bayesian estimation model for processing FTIR measurements to obtain accurate estimations of instantaneous …
Run-Out Based Crossed Roller Bearing Life Prediction By Utilization Of Accelerated Testing Approach And Fe Numerical Models, Luca Quagliato, Dongwook Kim, Nara Lee, Soyoung Hwang, Joseph P. Domblesky, Naksoo Kim
Run-Out Based Crossed Roller Bearing Life Prediction By Utilization Of Accelerated Testing Approach And Fe Numerical Models, Luca Quagliato, Dongwook Kim, Nara Lee, Soyoung Hwang, Joseph P. Domblesky, Naksoo Kim
Mechanical Engineering Faculty Research and Publications
Surface wear and spalling phenomena are the most important factors affecting roller bearing performance and operational lifetime, in terms of number of cycles the bearing can operate. Although bearing life has been traditionally defined by the onset of spalling, as specified by international standard ISO 281, this definition does not always reflect the real operational conditions, since bearing wear can also represent a failure criterion when excessive run-out occurs. In such cases, bearing life needs to be predicted according to the amount of bearing run-out resulting from wear due to load and number of cycles. In the current study, the …
Applied Force And Semg Muscle Activity Required To Operate Pistol Grip Control In An Electric Utility Aerial Bucket, Richard W. Marklin Jr., Jonathaon E. Slightam, Mark L. Nagurka, Trent M. Wolff, Casey D. Garces, Lovely Krishen
Applied Force And Semg Muscle Activity Required To Operate Pistol Grip Control In An Electric Utility Aerial Bucket, Richard W. Marklin Jr., Jonathaon E. Slightam, Mark L. Nagurka, Trent M. Wolff, Casey D. Garces, Lovely Krishen
Mechanical Engineering Faculty Research and Publications
Electric utility line workers report high levels of fatigue in forearm muscles when operating a conventional pistol grip control in aerial buckets. This study measured the applied force and surface electromyographic (sEMG) signals from four upper extremity muscles required to operate the pistol grip control in two tasks. The first task was movement of the pistol grip in six directions (up/down, forward/rearward, clockwise/counter-clockwise), and the second task was movement of the bucket from its resting position on the truck bed to an overhead conductor on top of a 40 ft tall pole. The force applied to the pistol grip was …
Effect Of Multiphase Radiation On Coal Combustion In A Pulverized Coal Jet Flame, Bifen Wu, Somesh Roy, Xinyu Zhao, Michael F. Modest
Effect Of Multiphase Radiation On Coal Combustion In A Pulverized Coal Jet Flame, Bifen Wu, Somesh Roy, Xinyu Zhao, Michael F. Modest
Mechanical Engineering Faculty Research and Publications
The accurate modeling of coal combustion requires detailed radiative heat transfer models for both gaseous combustion products and solid coal particles. A multiphase Monte Carlo ray tracing (MCRT) radiation solver is developed in this work to simulate a laboratory-scale pulverized coal flame. The MCRT solver considers radiative interactions between coal particles and three major combustion products (CO2, H2O, and CO). A line-by-line spectral database for the gas phase and a size-dependent nongray correlation for the solid phase are employed to account for the nongray effects. The flame structure is significantly altered by considering nongray radiation and …
Investigation Of The Scanning Microarc Oxidation Process, Linqin Xia, Jianmin Han, Joseph P. Domblesky, Zhiyong Yang, Weijing Li
Investigation Of The Scanning Microarc Oxidation Process, Linqin Xia, Jianmin Han, Joseph P. Domblesky, Zhiyong Yang, Weijing Li
Mechanical Engineering Faculty Research and Publications
Scanning microarc oxidation (SMAO) is a coating process which is based on conventional microarc oxidation (MAO). The key difference is that deposition in SMAO is achieved by using a stainless steel nozzle to spray an electrolyte stream on the substrate surface as opposed to immersing the workpiece in an electrolyzer. In the present study, SMAO discharge characteristics, coating morphology, and properties are analyzed and compared to results obtained from MAO under similar conditions. Results show that MAO and SMAO have comparable spark and microarc lifetimes and sizes, though significant differences in incubation time and discharge distribution were evident. Results also …
Developing A Low-Cost Force Treadmill Via Dynamic Modeling, Chih-Yuan Hong, Lan-Yuen Guo, Rong Song, Mark L. Nagurka, Jia-Li Sung, Chen-Wen Yen
Developing A Low-Cost Force Treadmill Via Dynamic Modeling, Chih-Yuan Hong, Lan-Yuen Guo, Rong Song, Mark L. Nagurka, Jia-Li Sung, Chen-Wen Yen
Mechanical Engineering Faculty Research and Publications
By incorporating force transducers into treadmills, force platform-instrumented treadmills (commonly called force treadmills) can collect large amounts of gait data and enable the ground reaction force (GRF) to be calculated. However, the high cost of force treadmills has limited their adoption. This paper proposes a low-cost force treadmill system with force sensors installed underneath a standard exercise treadmill. It identifies and compensates for the force transmission dynamics from the actual GRF applied on the treadmill track surface to the force transmitted to the force sensors underneath the treadmill body. This study also proposes a testing procedure to assess the GRF …