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Research and Publications - Department of Mechanical Engineering

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A Lightweight Exoskeleton-Based Portable Gait Data Collection System

Haque, Md Rejwanul; Imtiaz, Masudul H.; Kwak, Samuel T.; Sazanov, Edward; Chang, Young-Hui; Shen, Xiangong (2021)

For the controller of wearable lower-limb assistive devices, quantitative understanding of human locomotion serves as the basis for human motion intent recognition and joint-level motion control. Traditionally, the required ...
Modelling and Experimental Study of Fatigue of Powder Metal Steel (FC-0205)

Allison, P. G.; Hammi, Y.; Jordon, J. B.; Horstemeyer, M. F. (2013)

The microstructure sensitive multistage fatigue model captured the fatigue life of a powder metal FC-0205 steel alloy. Uniaxial strain controlled fatigue data and microstructure information from sets of high and low porosity ...
Development of Control Quality Factor for HVAC Control Loop Performance Assessment-II: Field Testing and Results (ASHRAE RP-1587)

Liu, Ran; Li, Yanfei; O'Neill, Zheng D.; Zhou, Xiaohui (2019)

This article is the third paper from the research project RP-1587, focusing on presenting a comprehensive field test of the proposed control quality factors (CQFs; i.e., CQF-Harris and CQF-exponentially weighted moving ...
Energy Savings and Ventilation Performance from CO2-Based Demand Controlled Ventilation: Simulation Results from ASHRAE RP-1747 (ASHRAE RP-1747)

O'Neill, Zheng D.; Li, Yanfei; Cheng, Hwakong C.; Zhou, Xiaohui; Taylor, Steven T. (2019)

This is the first journal paper from the ASHRAE research project RP-1747 “Implementation of RP-1547 CO2-based Demand Controlled Ventilation for Multiple Zone HVAC Systems in Direct Digital Control Systems.” HVAC designers ...
HVAC Control Loop Performance Assessment: A Critical Review (1587-RP)

O'Neill, Zheng; Li, Yanfei; Williams, Keith (2016)

This article presents a comprehensive review of control loop performance assessments in the context of building HVAC controls. Few studies are available for assessing HVAC control loop performance using a single control ...
Assessing the Validity, Reliability, and Practicality of ASHRAE’s Performance Measurement Protocols (ASHRAE Research Project 1702)

Wang, Liping; Mcmorrow, Gabrielle; Zhou, Xiaouhui; O'Neill, Zheng D. (2019)

The objective of this study was to provide a basis for future updates to the 2010 ASHRAE Performance Measurement Protocols for Commercial Buildings (PMP) through case studies. The PMP defines a standardized method of ...
Numerical Modelling of the Magnus Force and the Aerodynamic Torque on a Spinning Sphere in Transitional Flow

Volkov, Alexey N. (2007)

Three dimensional transitional flow over a spinning sphere is studied numerically by the direct simulation Monte Carlo method. The flow is assumed to be steady-state, gas molecules interact with each other as hard spheres ...
3D Numerical Modelling of a Rarefied Gas Flow in the Nearby Atmosphere around a Rotating Cometary Nucleus

Volkov, Alexey N.; Lukyanov, German A. (2007)

A combined 3D model of a nearby atmosphere around an arbitrary rotating spherical cometary nucleus is developed. The model includes a 3D unsteady model of solar radiation absorption and heating of the nucleus material ...
Kinetic Model of a Collisional Admixture in Dusty Gas and its Application to Calculating Flow Past Bodies

Volkov, Alexey N.; Tsirkunov, Yury M. (2000)

Using the methods of statistical physics, the basic kinetic equation describing the dynamics of a polydisperse admixture of solid particles in a dilute dusty-gas flow is derived. Particle rotation, inelastic collisions, ...
Fluid/Kinetic Hybrid Simulation of Atmospheric Escape: Pluto

Tucker, Orenthal J.; Erwin, Justin T.; Johnson, Robert E.; Volkov, Alexey N.; Cassidy, Timothy A. (2011)

A hybrid fluid/molecular kinetic model was developed to describe the escape of molecules from the gravitational well of a planet's atmosphere. This model was applied to a one dimensional, radial description of molecular ...
Kinetic Simulations of Thermal Escape from a Single Component Atmosphere

Volkov, Alexey N.; Tucker, Orenthal J.; Erwin, Justin T.; Johnson, Robert E. (2011-06-06)
Effect of Bending Buckling of Carbon Nanotubes on Thermal Conductivity of Carbon Nanotube Materials

Volkov, Alexey N.; Shiga, Takuma; Nicholson, David; Shiomi, Junichiro; Zhigilei, Leonid V. (2012-03-01)
Atomistic Simulations, Mesoscopic Modeling, and Theoretical Analysis of Thermal Conductivity of Bundles Composed of Carbon Nanotubes

Volkov, Alexey N.; Salaway, Richard N.; Zhigilei, Leonid V. (2013-09-10)

The propensity of carbon nanotubes (CNTs) to self-organize into continuous networks of bundles has direct implications for thermal transport properties of CNT network materials and defines the importance of clear ...
Heat Conduction in Carbon Nanotube Materials: Strong Effect of Intrinsic Thermal Conductivity of Carbon Nanotubes

Volkov, Alexey N.; Zhigilei, Leonid V. (2012-07-24)

Computational study of thermal conductivity of interconnected networks of bundles in carbon nanotube (CNT) films reveals a strong effect of the finite thermal conductivity kT of individual nanotubes on the conductivity ...
Thermally Driven Atmospheric Escape: Transition from Hydrodynamic to Jeans Escape

Volkov, Alexey N.; Johnson, Robert E.; Tucker, Orenthal J.; Erwin, Justin T. (2011-02-16)
Thermal Escape in the Hydrodynamic Regime: Reconsideration of Parker's Isentropic Theory Based on Results of Kinetic Simulations

Volkov, Alexey N.; Johnson, Robert E. (2013-03-10)
Molecular-Kinetic Simulations of Escape from the Ex-Planet and Exoplanets: Criterion for Transonic Flow

Johnson, Robert E.; Volkov, Alexey N.; Erwin, Justin T. (2013-12-06)

The equations of gas dynamics are extensively used to describe atmospheric loss from solar system bodies and exoplanets even though the boundary conditions at infinity are not uniquely defined. Using molecular-kinetic ...
Volatile Loss and Classification of Kuiper Belt Objects

Johnson, R. E.; Oza, A.; Young, L. A.; Volkov, A. N.; Schmidt, C. (2015-08-10)

Observations indicate that some of the largest Kuiper Belt Objects (KBOs) have retained volatiles in the gas phase (e.g., Pluto), while others have surface volatiles that might support a seasonal atmosphere (e.g., Eris). ...
A Criterion for the Validity of Parker's Model in Thermal Escape Problems for Planetary Atmospheres

Volkov, Alexey N. (2015-10-01)

Mass escape rate of mon- and diatomic gases from a planetary atmosphere is studied based on Parkerʼs model for a broad range of surface conditions. The escape rate is found to follow two asymptotic regimes, namely, high- ...

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Research and Publications - Department of Mechanical Engineering

Research and Publications - Department of Mechanical Engineering

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