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114th Annual ASEE Conference and Exposition, 2007

作者： Newberry, Byron Baylor University United States Department of Mechanical Engineering Baylor University United States Baylor Great Texts Program United States Texas Tech University University of Texas United States Japan IEEE Society for Social Implications of Technology United States L3 Communications Integrated Systems

In his book Designing Engineers, engineer Louis Bucciarelli answers the question "Do you know how your telephone works?" with the rhetorical rebuttal, "Does anyone know how their telephone works?" At first pass, we might be inclined to assume that engineers, scientists, or computer scientists are by default technologically literate - if anyone knows how the telephone works, surely it is them. But the intent of Bucciarelli's question is to point to a deeper ambiguity about what is means to "know" how something works, even in the case of a technical expert. Essentially what he is asking is "Is anyone really technologically literate?" This is the question I will explore philosophically in this paper, with particular focus on the technological literacy of technological professionals such as engineers. I will begin by examining the definitions of, and criteria for, technological literacy provided by the NAE report Technically Speaking. I will examine the extent to which those criteria might be satisfied, both for lay people as well as technological professionals. The Technically Speaking report describes some general obstacles to achieving technological literacy. I will discuss these challenges and offer some additional ones, including some to which technological professional contribute, and others which primarily affect technological professionals. I will close by offering some general observations from an engineer's perspective on the definition and goals of technological literacy. © American Society for engineering Education, 2007.

关键词： engineering education

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Field study and analytical assessment of two exterior walls in a hot and humid climate 14

Field study and analytical assessment of two exterior walls ...

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14th International Conference on Thermal Performance of the Exterior Envelopes of Whole Buildings 2019

作者： Nieto, Alejandra Desjarlais, Andre Miller, William Rockwool MiltonON Canada Building Envelope Systems Research Program Oak Ridge National Laboratory Oak RidgeTN United States Oak Ridge National Laboratory Oak RidgeTN United States School of Architecture and Design and in the Mechanical Aerospace and Biomedical Engineering Department KnoxvilleTN United States

Two wall systems were exposed for one-full year to the hot and humid climate of Charleston, SC. Both walls were installed on the southern exposure of the Natural Exposure Test (NET) facility. The first wall is a mass wall (CMU), fully grouted with acrylic stucco finish. The interior of the assembly consists of a layer of vapor permeable rigid insulation and gypsum board finished with latex paint. The second wall is a steel framed wall with semi-rigid batt insulation. The exterior of the assembly consists of clay brick cladding, an air space, vapor permeable semi-rigid insulation and exterior gypsum. The interior of the assembly is gypsum board attached to a steel frame and finished with latex paint. Both walls were insulated using vapor permeable stone wool insulation, applicable to the type of construction. The relative humidity, moisture content and overall heat flux within the assemblies was monitored and analyzed. Field data did not reveal evidence for the potential of moisture condensation in either wall assembly. Although, higher levels of relative humidity were found in both walls during certain times, with the highest values observed during the summer months when the partial pressure gradient from outside to inside would drive moisture into the wall and on into the conditioned space. The relative humidity on the interior side of the gypsum board was found to be highest for the steel framed wall with clay brick cladding, as compared to the mass wall. WUFI ORNL simulations were conducted using the measured indoor and outdoor temperatures and relative humidities as boundary conditions. Simulations showed the clay brick was often wet due to nighttime sky radiation which drops the wall temperature below the dew point temperature of the outdoor air. Moisture content for the layers of mass wall construction show that water diffuses primarily from the exterior toward the interior. © 2019 ASHRAE.

关键词： Moisture

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A Method for Determining the Crack Arrest Fracture Toughness of Ferritic Materials 19

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19th National Symposium on Fracture Mechanics

作者： Barker, D.B. Chona, R. Corwin, W.R. Fourney, W.L. Irwin, G.R. Marschall, C.W. Rosenfield, A.R. Wessel, E.T. Department of Mechanical Engineering University of Maryland College ParkMD20742 United States Department of Mechanical Engineering Texas A & M University College StationTX77843 United States Heavy Section Steel Technology Program Oak Ridge National Laboratory Martin Marietta Energy Systems Oak RidgeTN37831 United States Physical Metallurgy Section Battelle Columbus Division ColumbusOH43201 United States Haines City FL33844 United States

ISBN: (纸本)9780803109728

This paper summarizes the results from a round robin test program that was conducted from 1983 through 1985 to evaluate a proposed ASTM standard test method for determining the crack arrest fracture toughness of ferritic materials. The round robin attracted a total of 27 participants from the United States, Canada, Europe, and Japan, each of whom agreed to test three specimens of A514 bridge steel, three specimens of A588 bridge steel, and six specimens of A533 Grade B, Class 1 reactor pressure vessel steel. Twenty-one participants had completed their testing and forwarded test results when this paper was written, which provided a data base consisting of 54 test results for each of the bridge steels at - 30°C, 70 test results for the reactor steel at 10°C, and 65 test resuhs for the reactor steel at 25°C. This paper summarizes the test procedure followed in the round robin, discusses the results obtained, and provides the rationale for the modifications to the test method that were recommended in light of the experience gained from this test program. The test procedure has since been revised and is now proposed as the ASTM Test for Determining the Plane-Strain Crack-Arrest Fracture Toughness, K,,, of Ferritic Steels (E 1221). Copyright 1988 by ASTM International.

关键词： Fracture toughness

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Classification of the Structural Integrity by the General Vibration Method

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Procedia Computer Science 2019年 157卷 382-387页

作者： Fergyanto E. Gunawan Benfano Soewito Nico Surantha Tuga Mauritsius Nobumasa Sekishita Industrial Engineering Department BINUS Graduate Program - Master of Industrial Engineering Bina Nusantara University Jakarta Indonesia 11480 Computer Science Department BINUS Graduate Program - Master of Computer Science Bina Nusantara University Jakarta Indonesia 11480 Information Systems Information Department BINUS Graduate Program - Master of Information Systems Management Bina Nusantara University Jakarta Indonesia 11480 Department of Mechanical Engineering Toyohashi University of Technology Toyohashi Aichi 441-8580 Japan

Traditionally, for the purpose of classifying the integrity of an engineering structure, one may use the information of the natural frequencies or mode shapes or some other measures derived from the two. In this research, we propose a classification method on the basis of the general vibration model. The general vibration model is essentially a set of differential equations describing the dynamics of the structure under consideration. For the purpose of damage detection, a deviation of the general vibration model from the dynamic equilibrium point marks the occurrence of the damage. To demonstrate the effectiveness of the method, we study two simplest dynamical systems consisting of one- and two-concentrated masses subjected to a prescribed dynamic load. The structural damages are introduced artificially by reducing the stiffness of spring in the structures. We find that the general vibration model is more sensitive to damages than the traditional methods.

关键词： General Vibration Model Structural Integrity Structural Health Monitoring Power Spectral Density Damage Index

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A Study of the Sensitivity of the Fuel Consumption to Driving Strategy by Micro Simulation

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Procedia Computer Science 2019年 157卷 375-381页

Global warming due to excessive emission greenhouse gases is a significant issue faced by humanity, and collectively, cars and trucks contribute about 20% to the entire global-warming gases. For a reason, recently, many attempts have been endured to reduce the emission and to increase fuel efficiency, including vehicle platooning, better driving strategy, and increasing engine efficiency. This study intends to provide a more detail assessment regarding the effects of the driving strategy to fuel consumption. For the purpose, the vehicle dynamics are quantified by employing the car-following model based on the optimal velocity model. The fuel consumption is estimated from the regression model of Ahn 18 . The result suggests that the braking distance strongly affects fuel consumption.

关键词： Optimal Velocity Model Micro Simulation Car-Following Model Fuel Efficiency

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Special Session: Re-Imagining engineering Education: Feminist Visions for Transforming the Field

Special Session: Re-Imagining Engineering Education: Feminis...

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37th Annual Frontiers in Education Conference (FIE 2007), vol.3

作者： Donna Riley George Catalano Alice Pawley Jessica Tucker Picker Engineering Program Smith College USA Mechanical Engineering Binghamton University USA Industrial and Systems Engineering University of Wisconsin Madison USA Engineering Education Researcher Technology & Society Stony Brook University USA

The goal of this special session is to explore what engineering education might be like if it were done from a feminist perspective, and how this new vision might influence the profession and society. Feminist perspectives are understood broadly to recognize the connectedness of all forms of social injustice. Thus feminist visions of engineering might address a broad set of concerns such as militarism, racism, and global economic inequality as well as sexism and heterosexism. Outcomes include concrete ideas for future research and institutional transformation, collaboration and mutual support of one another's efforts.

关键词： Feminism Liberative pedagogies Social justice engineering ethics

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Acoustic Absorption Characteristics of Perforated Thin Plate with Air Jets and Cavity

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Open Journal of Fluid Dynamics 2015年第1期5卷 1-9页

作者： Hiromitsu Hamakawa Hiroki Matsuoka Taiki Yamai Kenta Asakura Toru Otsuru Reiji Tomiku Eru Kurihara Hidechito Hayashi Eiichi Nishida Department of Mechanical Engineering Oita University Oita Japan Graduate School Master’s Program of Engineering Oita University Oita Japan Torishima Pump Mfg. Co. Ltd Takatsuki-shi Osaka Japan Department of Architecture Oita University Oita Japan Department of Mechanical Engineering Nagasaki University Nagasaki Japan Department of Mechanical Systems Engineering Shonan Institute of Technology Fujisawa-shi Kanagawa Japan

The present paper focuses on the effect of air jets through a perforated thin plate on the characteristics of an acoustic absorption coefficient. We measured the flow rate, internal pressure, acoustic pressure, and transfer function by using an improved acoustic impedance tube. The normal incidence absorption coefficient was calculated from the measured transfer function using transfer function methods. As a result, the frequency characteristics of the acoustic absorption coefficient against the frequency showed a maximum value at the local frequency. The peak frequency of the acoustic absorption coefficient depended on the thickness of the background air space and the thickness of the perforated plate. As the flow rate increased through the micropores, the peak level of the acoustic absorption coefficient also increased until a flow rate of 80?l /min. As the flow rate further increased, the peak level of the acoustic absorption coefficient decreased and that of the high frequency band increased.

关键词： Acoustic Absorption Coefficient Perforated Plate Cavity Micropores Air Jets Acoustic Impedance Tube

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Molding Compound Effects on Warpage of Fan-out Wafer Level Packaging

Molding Compound Effects on Warpage of Fan-out Wafer Level P...

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International Symposium on Electronic Materials and Packaging

作者： Yan-Cheng Liu Hsien-Chie Cheng Zong-Da Wu Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University Taichung Taiwan ROC Department of Aerospace and Systems Engineering Feng Chia University Taichung Taiwan ROC

ISBN: (纸本)9781538656433;9781538656426

Fan-out Wafer-level Packaging (FOWLP) technology has become one of the most rapid packaging technologies which can meet consumer demand for electronic devices. Since there are many advantages to FOWLP, several important issues remain to be addressed, including yield, reliability, thermal performance, die shift, and warpage. Therefore, the main reasons that cause the yield problem of the FOWLP are the mismatch of temperature loading and coefficient of thermal expansion(CTE) among the components of the package, and the other reason is the chemical shrinkage of liquid type epoxy molding compound during the cure process. In this study, the main goal is to assess the process-induced warpage of FOWLP during the fabrication process. To predict the amount of warpage precisely, a process-dependent simulation model which includes the cure-induced shrinkage of the liquid type of molding compound obtained by measurement is proposed. To confirm the validity of the simulation model, the simulation results are compared to the online warpage measurement data. Finally, the influence of the material properties of molding compound parameters on the process-induced warpage is discussed.

关键词： Compounds Semiconductor device modeling Fabrication Packaging Solid modeling Wafer scale integration

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Firefly approach optimized wavenets applied to multivariable identification of a thermal process

Firefly approach optimized wavenets applied to multivariable...

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IEEE EUROCON

作者： Leandro dos Santos Coelho Carlos Eduardo Klein Luiz Guilherme J. Luvizotto Viviana Cocco Mariani Industrial and Systems Engineering Graduate Program (PPGEPS) Pontifical Catholic University of Parana Volvo do Brasil Veiculos Ltda Department of Mechanical Engineering (PPGEM) Pontifical Catholic University of Parana

ISBN: (纸本)9781467322331

The combination of wavelet theory and feedforward artificial neural networks has resulted in wavelet neural networks or wavenets (WNNs). In these networks, the activation functions are described by discrete wavelet functions. Due to the promising properties of time-frequency localization and multi-resolution signal processing of the wavelet transform combined with the approximation capability of artificial neural networks, WNNs have found applications in dynamic system identification field during the past years. The paper aims at the development of the WNN based on traditional firefly algorithm (FA). The proposed FA is based on Tinkerbell map to tune the spread of wavelets and number of selected wavelet bases. The FA is a stochastic metaheuristic approach based on the idealized behaviour of the flashing characteristics of fireflies. In FA, the flashing light can be formulated in such a way that it is associated with the objective function to be optimized, which makes it possible to formulate the firefly algorithm. The efficacy of WNN with FA tuning is tested on the identification of a multivariable thermal process.

关键词： Wavelet neural network System identification Firefly optimization Chaotic sequences Metaheuristics

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Formation flying techniques for the virtual telescope for X-ray observations 69

Formation flying techniques for the virtual telescope for X-...

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69th International Astronautical Congress: #InvolvingEveryone, IAC 2018

作者： Kyle, Rankin Neerav, Shah John, Krizmanic Steven, Stochaj Asal, Naseri Department of Mechanical and Aerospace Engineering New Mexico State University United States Goddard Space Flight Center NASA United States CRESST NASA GSFC University of Maryland Baltimore County United States Klipsch School of Electrical and Computer Engineering New Mexico State University United States Program Manage/Systems Engineer Space Dynamics Laboratory United States

The Virtual Telescope for X-Ray Observations (VTXO) is an Astrophysics SmallSat mission being developed to demonstrate 10-milliarcsecond X-ray imaging using a Phase Fresnel Lense (PFL)-based space telescope. PFLs promise to provide several orders of magnitude improvement in angular resolution over current state of the art X-ray optics. However, PFLs for astronomical applications requires a very long focal length, for VTXO the focal length is estimated to be in the range of 0.5 km to 4 km. Since these focal lengths are not feasible on a single spacecraft, the proposed solution is to use two separate spacecraft, one with the lense(s), and the second with an X-ray camera. These two spacecrafts will then fly in a formation approximating a single rigid telescope. In order to achieve this configuration, the two spacecraft must maintain the formation a focal length distance apart, with centimeter level control, and sub-millimeter level knowledge requirements. Additionally, for the telescope to achieve sufficient exposure time, the system must keep the telescope axis pointed at a fixed target on the celestial sphere for durations on the order of a few hours. VTXO's system architecture calls for two CubeSats to operate in a highly eccentric Earth orbit with one of the spacecraft's traveling on a natural keplarian orbit. The second spacecraft will then fly on a â€œpseudoâ€¥ orbit maintaining a fixed offset relative to the celestial sphere during observations. Observations with this system will occur near apogee where differential forces on the spacecrafts are minimal which in turn minimizes fuel consumption. The â€œpseudoâ€¥ orbit where the second spacecraft is located is not quite a stable orbit requiring small continuous propulsion to maintain formation. This paper and presentation will overview VTXO's system architecture, additionally it will look in depth at the formation flying techniques, including fuel consumption, and methods for establishing, and maintaining the form

关键词： Orbits

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