Gene Liao - Academia.edu (original) (raw)

Papers by Gene Liao

Http Www Acciontierra Org, 2014

Hermosa escritura-investigacion del pensador-agricultor colombiano Omar Felipe Giraldo, es una ob... more Hermosa escritura-investigacion del pensador-agricultor colombiano Omar Felipe Giraldo, es una obra unica en el panorama del pensamiento critico ambiental en esta tierra llamada por los kunas, Abya Yala. Esta potente palabra caracteriza como utopia, dos acontecimientos inseparables: la manera como habitamos la Tierra, y la manera como la Tierra permite que la habitemos. Abya Yala significa buen vivir-tierra generosa, tierra en florecimiento. Para los quechuas, buen vivir se expresa como sumak (...)

American Journal of Engineering Education (AJEE), 2018

There is a major trend in engineering education to provide students with realistic hands-on learn... more There is a major trend in engineering education to provide students with realistic hands-on learning experiences. This paper reports on the results of work done to develop standardized test instruments to use for student learning outcomes assessment in an experiential hands-on manufacturing engineering and technology environment. The specific outcomes targeted for assessment are those defined under the MILL (Manufacturing Integrated Learning Laboratory) Manufacturing Competency Model. In a unique feature aimed at experiential learning, the test instruments incorporate the use of a physical manipulative to evaluate attainment of particular hands-on skills. The resulting standardized tests have been subjected to extensive psychometric analysis. The results of the analysis indicate excellent structure of the test instruments. The test instruments have shown high levels of stability, internal consistency, and reliability. These tests can be used as instruments for outcomes assessment to...

International Journal of Engineering Education, 2019

The use of biobased materials for industrial and consumer products has received more and more att... more The use of biobased materials for industrial and consumer products has received more and more attention because of theneed for sustainability and to address the climate change. Biobased materials are renewable and derived from agriculture,silviculture, and terrestrial/aquatic microbial systems and have been used by humans for thousands of years in manyaspects. To pursue technological edges and environmental benefits, the United States Government has been pushing forfurther development and applications of biobased materials. For further growth in this area, we have seen that there is astrong need for professionals from various backgrounds, including biology, chemistry, and engineering. However, to ourknowledge, there are no exiting course series or degree programs on biobased materials in the US for engineering studentsand practicing engineers, as compared to the international counterparts. To address this issue, we developed and offered anew series of biobased materials courses to b...

Batteries, 2021

The nail penetration test has been widely adopted as a battery safety test for reproducing intern... more The nail penetration test has been widely adopted as a battery safety test for reproducing internal short-circuits. In this paper, the effects of cell initial State-of-Charge (SOC) and penetration location on variations in cell temperature and terminal voltage during penetration tests are investigated. Three different initial SOCs (10%, 50%, and 90%) and three different penetration locations (one is at the center of the cell, the other two are close to the edge of the cell) are used in the tests. Once the steel cone starts to penetrate the cell, the cell terminal voltage starts to drop due to the internal short-circuit. The penetration tests with higher initial cell SOCs have larger cell surface temperature increases during the tests. Also, the penetration location always has the highest temperature increment during all penetration tests, which means the heat source is always at the penetration location. The absolute temperature increment at the penetration location is always higher...

2005 Annual Conference Proceedings

This paper presents the simulation of Metal-Inert-Gas (MIG) arc welded part distortion and its co... more This paper presents the simulation of Metal-Inert-Gas (MIG) arc welded part distortion and its correlation with test for an automotive engine cradle. A Finite Element Analysis (FEA)-based method is developed to predict the welding distortion. The developed technique has elasticplastic constitutive material model with temperature-dependent material properties. The inherent shrinkage of weld and two weld sequences are simulated. In addition to distortion, residual stress and plastic strain distributions are obtained from the analysis. The heat sink effect is also analyzed using transient thermal-mechanical analysis. The predicted welding distortion is in reasonable accuracy as it correlated with test data.

Energies, 2020

Modelling, simulation, and validation of the 12-volt battery pack using a 20 Ah lithium–nickel–ma... more Modelling, simulation, and validation of the 12-volt battery pack using a 20 Ah lithium–nickel–manganese–cobalt–oxide cell is presented in this paper. The cell characteristics influenced by thermal effects are also considered in the modelling. The parameters normalized directly from a single cell experiment are foundations of the model. This approach provides a systematic integration of actual cell monitoring with a module model that contains four cells connected in series. The validated battery module model then is utilized to form a high fidelity 80 Ah 12-volt battery pack with 14.4 V nominal voltage. The battery cell thermal effectiveness and battery module management system functions are constructed in the MATLAB/Simulink platform. The experimental tests are carried out in an industry-scale setup with cycler unit, temperature control chamber, and computer-controlled software for battery testing. As the 12-volt lithium-ion battery packs might be ready for mainstream adoption in a...

Vehicles, 2019

Lithium-ion polymer batteries currently are the most popular vehicle onboard electric energy stor... more Lithium-ion polymer batteries currently are the most popular vehicle onboard electric energy storage systems ranging from the 12 V/24 V starting, lighting, and ignition (SLI) battery to the high-voltage traction battery pack in hybrid and electric vehicles. The operating temperature has a significant impact on the performance, safety, and cycle lifetime of lithium-ion batteries. It is essential to quantify the heat generation and temperature distribution of a battery cell, module, and pack during different operating conditions. In this paper, the transient temperature distributions across a battery module consisting of four series-connected lithium-ion polymer battery cells are measured under various charging and discharging currents. A battery thermal model, correlated with the experimental data, is built in the module-level in the ANSYS/Fluent platform. This validated module thermal model is then extended to a pack thermal model which contains four parallel-connected modules. The ...

Volume 11: New Developments in Simulation Methods and Software for Engineering Applications; Safety Engineering, Risk Analysis and Reliability Methods; Transportation Systems, 2010

The impact of the vehicle fuel economy in tactical convey is amplified due to the fact that much ... more The impact of the vehicle fuel economy in tactical convey is amplified due to the fact that much of the present logistics support is devoted to moving fuel. Fuel economy improvement on medium-duty tactical truck has and continues to be a significant initiative for the U. S. Army. The focus of this study is the investigation and analysis of Automated Manual Transmissions (AMT) that have potential to improve the fuel economy of the 2.5-ton cargo trucks. The current platform uses a seven-speed automatic transmission. This study utilized a combination of on-road experimental vehicle data and analytical vehicle model and simulation. This paper presented the results of (1) establishment of a validated, high fidelity baseline analytical vehicle model, (2) modeling and simulation of two AMTs and their control strategy, and (3) optimization of transmissions shift schedules to minimize the fuel consumption. The fuel economy discrepancy between experimental average and the baseline simulation ...

SAE International Journal of Commercial Vehicles, 2014

Vehicle Engineering, 2015

This paper presents on‐ and off‐road virtual testing of driveability and rideability on the Famil... more This paper presents on‐ and off‐road virtual testing of driveability and rideability on the Family of Medium Tactical Vehicle (FMTV) cargo trucks. Proving ground tests are also conducted to provide some experimental correlation and validation of the simulation results. The front suspension of the current baseline FMTV is a solid axle with leaf springs and shock absorbers. Two other types of suspension systems including passive and semi‐active suspensions are evaluated in solid axle and fully independent configurations. The objective of this study is to evaluate the capability of virtual tests in vehicle performance. The comprehensive experiments also investigate the capabilities of various suspensions which have been considered in future FMTV design for mobility performance improvement.

2011 IEEE Vehicle Power and Propulsion Conference, 2011

This paper presents the traction motor sizing for optimal urban fuel economy in two mild and thre... more This paper presents the traction motor sizing for optimal urban fuel economy in two mild and three strong hybridization powertrains on front-wheel-drive vehicles. The traction motor sizes, by means of motor rated torque and speed, are optimized for maximum urban fuel economy. The two mild hybrids are Belt-Integrated-Starter-Generator (B-ISG) and Crankshaft-Integrated-Starter-Generator (C-ISG) systems. The three strong hybrid configurations include an

Volume 11: Transportation Systems, 2012

Fuel economy improvement on medium-duty tactical truck has and continues to be a significant init... more Fuel economy improvement on medium-duty tactical truck has and continues to be a significant initiative for the U.S. Army. The Crankshaft-Integrated-Starter-Generator (C-ISG) is one of the full hybrid propulsions to improve the fuel economy. The C-ISG configuration is attractive because one electric machine can be used to propel the vehicle, to start the engine, and to be function as a generator. The C-ISG has been implemented in one M1083A1 5-ton tactical cargo truck. This paper presents the experimental evaluation of the C-ISG hybrid truck performance characteristics compared to the conventional truck. The evaluated performance characteristics include all electric range for on- and off-road mission cycles, fuel consumption, as well as the battery charging profile and the silent watch time duration in the static tests.

Volume 7: Engineering Education and Professional Development, 2007

World competition and stringent United States fuel economy goals and emission regulations for the... more World competition and stringent United States fuel economy goals and emission regulations for the 21st Century vehicle have pressured the automotive industry to design and evaluate advanced automobiles at an accelerated rate. The industry consensus is that the Hybrid Electric Vehicle (HEV) is the currently available technology for increasing propulsion system efficiency and decreasing pollutant emissions. However, HEVs operate much differently than conventional vehicles. Therefore, existing design techniques and guidelines developed for conventional powertrains do not apply well to hybrid vehicles. There is a need for training automotive technicians and engineers as well as educating students in this new and emergent technology of HEV. This paper describes a funded project whose goal is to fill this need by developing multidiscipline learning materials for HEV technology. This project targets engineering/engineering technology students in 4-year universities, automotive technology students in community colleges, automotive engineers and technicians in industries, and technology teachers in secondary schools.Copyright © 2007 by ASME

Dynamic Systems and Control, Parts A and B, 2004

This paper describes four conceptual designs of strong hybrid vehicle powertrains. These concepts... more This paper describes four conceptual designs of strong hybrid vehicle powertrains. These concepts enable conversion of conventional powertrains into strong hybrid powertrains with minimal tear-up to the existing architecture. These concepts are configured as follows: (1) incorporates an electric machine attached to the front axle of a conventional rear-wheel-drive vehicle; (2) a Flywheel-Alternator-Starter (FAS) system with a motor placed between the torque converter and the transmission; (3) same as previous one but where the torque converter is replaced by a starting clutch; and (4) a dual mode Electric Variable Transmission (EVT). These concepts provide extensive hybrid functionality such as, electric motor-only drive; launch assist, braking energy recovery and regeneration. Simulation results indicate that the proposed strong hybrid concepts have the potential to provide fuel economy gains of 19% to 26% over conventional powertrains.Copyright © 2004 by ASME

2012 IEEE Transportation Electrification Conference and Expo (ITEC), 2012

Volume 6: ASME Power Transmission and Gearing Conference; 3rd International Conference on Micro- and Nanosystems; 11th International Conference on Advanced Vehicle and Tire Technologies, 2009

This paper reports the planning efforts on reducing fuel consumption rate in the current fleet of... more This paper reports the planning efforts on reducing fuel consumption rate in the current fleet of medium-duty tactical truck. A strategic plan was developed through investigation of current and future technology offerings from original equipment manufacturers and aftermarket suppliers. Research efforts consisted of an initial phase where a broad range of integration candidates were collected and a secondary phase where in-depth analysis was conducted to target those to consider for inclusion in the strategic plan. Each product was evaluated on its technical merits with consideration given to the needs and strategic goals of government agencies. The strategic plan lays out the integrated technologies in the near-term including hydrogen injection and auxiliary electrification of engine cooling fan. For the mid-term timeframe, the plan involves implementing an engine stop/start system and electrifying other auxiliaries. The final step in the plan is the development and implementation of a full (strong) hybrid population.Copyright © 2009 by ASME

41st North American Power Symposium, 2009

... The engine has the feature of being turned ON/OFF automatically. Generator Single phaseAC gen... more ... The engine has the feature of being turned ON/OFF automatically. Generator Single phaseAC generator, 60 Hz, 4 pole, 1800 RPM, 5 kVA, 120 V. GSCM Receiving either automatic or manual commands to start or stop an ICE/generator set. ...

Innovations in Engineering Education: Mechanical Engineering Education, Mechanical Engineering/Mechanical Engineering Technology Department Heads, 2004

The Learning Factory concept was first developed as part of the TRP/NSF funded Manufacturing Engi... more The Learning Factory concept was first developed as part of the TRP/NSF funded Manufacturing Engineering Education Partnership (MEEP). The objective of the Learning Factory (LF) is to integrate a practice-based engineering curriculum that balances analytical and theoretical knowledge with physical facilities for product realization in an industrial-like setting. The LF model emphasizes practical experience and consequently, Engineering Technology (ET) and other programs that emphasize hands-on experiences for students are well suited to implementing the LF model. This paper describes a project whose goal is to adapt the LF model for implementation in regular academic programs oriented to practical applications without having to build an actual factory. This work is being accomplished by modifying five carefully selected courses in our programs, leading to the use of coordinated projects across those courses. The projects focus on the making of functional model engines. In the variou...

33rd Annual Frontiers in Education, 2003. FIE 2003.

The objective of the Learning Factory is to integrate a practice-based engineering curriculum tha... more The objective of the Learning Factory is to integrate a practice-based engineering curriculum that balances analytical and theoretical knowledge with physical facilities for product realization in an industriallike setting. The Learning Factory model emphasizes practical experience and consequently, all programs that stress hands-on experiences for students are well suited to implementing the model. This paper describes a project whose goal is to adapt the model for implementation in regular academic programs without having to build an actual factory. This was accomplished by modifying five carefully selected courses, leading to the use of coordinated projects across those courses. The projects focus on the making of functional model engines. In these courses, students generate engineering drawings of engine components, produce process plans for and make the components, and assemble and test the engines. This affords students practical experience and understanding of the full range of issues involved in product design, manufacturing planning, fabrication, assembly and testing of functional products.