Part 2: Self-driving Cars Expand the Fight Over Airwaves

2018-11-26T09:53:05+00:00

Engineers Say Public is Hungry for More Wi-Fi Capacity, the telecom industry is looking to snatch control of underutilized airwaves reserved for the auto industry. But this is coming just as carmakers begin to make progress on developing and adopting technologies for connected and autonomous cars that currently rely on that spectrum. The Big Picture: Tech and telecom companies have been fighting for years over spectrum to support exploding demand for mobile services and smartphones. Automakers have had exclusive access to a band of spectrum for almost 20 years but haven't done much with it, prompting telecom providers to argue, "Use it or lose it." The Dilemma: Some safety advocates and automakers worry that commercial Wi-Fi will interfere [...]

Part 2: Self-driving Cars Expand the Fight Over Airwaves 2018-11-26T09:53:05+00:00

Engineers Develop Ways to Ventilate Your Home

2018-09-25T15:38:05+00:00

Why ventilate? For centuries homes weren’t ventilated, and they did all right, didn’t they? Why do we need to go to all this effort (and often considerable expense) to ventilate houses today?  Engineers have developed several reasons that ventilation is more important today than it was long ago. Most importantly, houses 100 years ago were leaky. Usually they didn’t have insulation in the walls, so fresh air could easily enter through all the gaps, cracks, and holes in the building envelope., the building materials used 100 years ago were mostly natural products that didn’t result in significant off gassing of volatile organic compounds (VOCs), formaldehyde, flame retardants, and other chemicals that are so prevalent in today’s building materials, furnishings, [...]

Engineers Develop Ways to Ventilate Your Home 2018-09-25T15:38:05+00:00

Material Engineers : Pros and Cons of Solar Powered Cars

2018-07-25T09:17:33+00:00

Figure 1.  Solar Powered Cars in the Future Although a solar power car may not be commercially viable right now, there are ways that solar power can be added to existing designs to make vehicles more efficient. Material Scientist examine the pros and cons of this technology, it can continue to move forward in development to help save on fossil fuels, and the electric grid and pollutions. Solar-powered vehicles (Solar Cells ) have zero emission level, as they don’t utilize non-renewable resources and burn fuel. The electric motors generate electricity (See Figure 1.) that doesn't emit any greenhouse gases or any other pollutants. These cars are quieter than the vehicles powered by conventional fuels, which don't cause noise pollution as well. Lets [...]

Material Engineers : Pros and Cons of Solar Powered Cars 2018-07-25T09:17:33+00:00

Electric Vehicle Batteries: Recycled

2018-07-18T14:04:45+00:00

  Material Scientist Ponder What to Do With Used EV Batteries  As electric vehicles become mainstream, mechanical engineers and chemical engineers are trying to address the big environmental question: what do we do with the used lithium-ion batteries? The batteries used in electric cars are physically large, last 8 to 10 years, and will account for 90 per cent of the lithium-ion battery market by 2025.  This will increase lithium demand fourfold, and more than double the demand for cobalt — two of their essential elements.  The price of cobalt has already risen by more than 80 per cent in 2018.   Most expert Material Scientists agree that a replacement hybrid car battery can range from $1,000 to more than $6,000.  The [...]

Electric Vehicle Batteries: Recycled 2018-07-18T14:04:45+00:00

Semiconductor Worldwide: Samsung Takes Over

2018-06-22T11:44:20+00:00

Samsung topples Intel as top dog semiconductor market share  Gartner beancounters say price rises driven by memory shortages propelled Samsung into the lead based on semiconductor vendor revenue, vaulting past Intel and its CPUs. The largest memory supplier, Samsung Electronics, gained the most semiconductor market share and took the No. 1 position from Intel – the first time Intel has been toppled since 1992. Memory accounted for more than two-thirds of all semiconductor revenue growth in 2017, and became the largest semiconductor category.  DRAM prices rose 44 per cent from 2016 to 2017, and NAND flash prices went up 17 per cent year-over-year for the first time. (See Figure Below)   A Gartner table provides the numeric nitty-gritty [...]

Semiconductor Worldwide: Samsung Takes Over 2018-06-22T11:44:20+00:00

A Mechanical Engineer Designs Ways to Give Your Canine Friend a Lift Up: Dog Ramps

2018-02-15T10:34:21+00:00

A Mechanical Engineer Designs Ways to Give Your Canine Friend a Lift Up  A Mechanical Engineer designs ways to give your "Best Friend" easy access to your vehicle and different higher surfaces. Read more to find out what kind of options are available for your dog.  A properly sized and installed dog ramp eases a dog's boarding dilemmas.  Ramps are divided into several categories: folding, telescoping, fixed, moveable and those that are stored under the back bumper of a car.  This article describes the different types of dog ramps available and the engineering required to properly design them.    Fig. 1 Mechanical Engineers Design Easy Car Access for Dogs Mechanical Design, Materials Science,  Weight, and Ease [...]

A Mechanical Engineer Designs Ways to Give Your Canine Friend a Lift Up: Dog Ramps 2018-02-15T10:34:21+00:00

Licensed Mechanical Engineers Help You Ditch Suburbia

2018-02-13T23:41:15+00:00

Licensed Mechanical Engineers Help You Ditch Suburbia Licensed Mechanical Engineers Ensure Vehicle Safety and Comfort The recreational vehicle industry (Fig. 1) is flourishing.  People can use their RVs full time part, part time or travel the country for months at a time. A Licensed Mechanical Engineer (Licensed Mechanical Engineers Role in Manufacturing) makes certain that travel is safe and comfortable at the same time, without missing out on the comforts of home and your favorite kitchen. (Fig. 2)  Recreational vehicles' kitchens are designed with adequate ventilation to ensure that no fires occur.    Across that spectrum, the RV industry is enjoying an unprecedented growth.  Who are these RVers? They love the beauty and solace of being outdoors, abiding [...]

Licensed Mechanical Engineers Help You Ditch Suburbia 2018-02-13T23:41:15+00:00

Wind Load Calculations and Modeling

2018-02-20T12:26:27+00:00

 Part 1 of our Wind Load Series “Wind load” is a calculated value representing the total force on a structure or object cause by pressure from wind moving over it.  In this blog series, we will discuss different methods for wind load calculations, the factors that influence its magnitude, and the effects a high wind load can have on a structure.  Wind load is most commonly addressed by civil and structural engineers when designing buildings, but mechanical engineers can encounter the effect when designing tall objects like cranes, telescoping communications masts or wind turbine towers. Wind Load Essentials As a force, wind load is the product of pressure distributed over an area (psf times ft2 or Pa times m2).  In [...]

Wind Load Calculations and Modeling 2018-02-20T12:26:27+00:00

Layered Composite Heaters for Semiconductor Processing

2018-02-20T12:34:14+00:00

Figure 1: Composite layered heater from patent  US 9,224,626 B2 Alexander Glew, Ph.D., P.E. recently contributed to a new patent on an advanced thin-film electric heaters, layered composite heaters, for CVD semiconductor processing and related technologies titled “Composite substrate for layered heaters”.  Watlow Electric, based in St. Louis, hired Glew Engineering and Dr. Glew to help develop this heater technology due to his experience in the Silicon Valley’s semiconductor industry.  As a semiconductor equipment expert and materials engineering consultant, Dr. Glew’s familiarity with semiconductor manufacturing meant he understood both the limitations of common semiconductor chuck heating methods and the techniques that could be used to construct a better heater.  In this post, we review how this composite heater capitalizes on semiconductor [...]

Layered Composite Heaters for Semiconductor Processing 2018-02-20T12:34:14+00:00

Italian Masters: Leonardo da Vinci – Artist, Engineer, Scientist

2018-02-20T13:14:29+00:00

Figure 1: Leonardo da Vinci, by Francesco Melzi Over the course of this blog series, I have written about a number of Italian Masters of science and engineering, from astronomers like Galileo and Cassini to physicists like Torricelli and Venturi.  I’ve saved the best for last, however: Leonardo da Vinci.  He is the quintessential renaissance man who fits both our running definition of “Italian Master” as well as being included in the standard list of Masters with Rafael, Donatello and Michelangelo  Leonardo’s incredibly broad array of talents and interests have long been the subjects of movies, books, TV shows, and, of late, video games.  Throughout his life, he had one hand in the arts, ranging from painting, sculpting, music, history, and literature, [...]

Italian Masters: Leonardo da Vinci – Artist, Engineer, Scientist 2018-02-20T13:14:29+00:00

Thermal Expansion in a Glass and Aluminum Window: Part 2

2018-02-20T13:29:14+00:00

Figure 1: Simplified model of an aluminum-glass window   In last week’s blog, Thermal Expansion in a Glass and Aluminum Window: Part 1, we introduced the basic concept of thermal expansion in solid materials.  Since CTE mismatch can impose extremely high stress, during mechanical engineering design one must consider the temperature exposure and expansion or contraction of a material.  In order to help the read gain insight, we used a simplified aluminum-framed window to demonstrate that a hot summer day would be enough to shatter glass if the window wasn’t equipped with a flexible gasket between the frame and the glass.  For this entry, we utilize a finite element analysis (FEA) to elucidate the stress effects caused by both high and [...]

Thermal Expansion in a Glass and Aluminum Window: Part 2 2018-02-20T13:29:14+00:00

Thermal Expansion in a Glass and Aluminum Window: Part 1

2018-02-21T10:38:23+00:00

Equipment designers must accommodate thermal expansion (CTE)of dissimilar materials, especially when they are subject to large temperature changes.  This problem is often called "CTE mismatch."  In this blog, we give the fundamentals of thermal expansion calculations used in thermo-mechanical analysis. These calculations are simple but useful, and easy enough to perform by hand or with a spread sheet. For more complicated shapes, one must use computer modeling.  As an example, we perform a finite element analysis (FEA) in a later blog http://glewengineering.com/thermal-expansion-in-a-glass-and-aluminum-window-part-2/, of a glass and aluminum window and frame to show where the stress is excessive.  This points to the obvious need for a gasket to perform as a thermal interface material, in order to lessen [...]

Thermal Expansion in a Glass and Aluminum Window: Part 1 2018-02-21T10:38:23+00:00

Italian Masters: Galileo’s Stellar Science and Engineering

2018-02-21T10:55:17+00:00

Portrait of Galileo Galilei Justus Sustermans [Public domain], via Wikimedia Commons I’d like to return to our previous series on the Italian Masters, focused not on the usual masters or painting and sculpture but on the masters or science, mathematics, and engineering.  So far in the series I’ve written about the accomplishments of Volta, Cassini, Venturi and Torricelli.  Today, I’d like to look at one of the greats: Galileo Galilei.  Galileo is most famous today for standing up for heliocentrism against the Catholic Church and spending the last years of his life under house arrest as punishment.  However, Galileo didn’t let controversies or confinement stop him, and accomplished a great amount of research in not only [...]

Italian Masters: Galileo’s Stellar Science and Engineering 2018-02-21T10:55:17+00:00

12 Years a Martian: Mechanical Engineering on Mars, The Red Planet

2018-04-10T16:24:41+00:00

Figure 1: Mars Exploration Rover mobility testing By NASA

12 Years a Martian: Mechanical Engineering on Mars, The Red Planet 2018-04-10T16:24:41+00:00

FEA Consulting Part 6: Analyzing Results

2017-11-08T16:44:21+00:00

Figure 1: Shear stress results for our concrete slab simulation.  The red area of high compression is where the corner of the square-shaped supporting column holds up the slab. © Glew Engineering Consulting, 2016 Welcome to the final entry in our finite element analysis (FEA) blog series, in which I'll discuss a little about analyzing and evaluating FEA results.  Over the course of this blog series, I've covered tips on setting up the model in CAD and in the FEA program, configuring the analysis, and generating results.  The final step in the process is the analysis of the results, both to get the answers to whatever problem inspired the FEA simulation and to ensure that the final results are [...]

FEA Consulting Part 6: Analyzing Results 2017-11-08T16:44:21+00:00

FEA Consulting Part 5: Generating Results

2017-05-03T15:37:10+00:00

Figure 1: Displacement results for our concrete slab simulation.  The slab is supported in the center by a square column, and on the sides by a theoretical wall. © Glew Engineering Consulting, 2016 Time now for the last in our blog series on FEA.  I’ve previously discussed how to set up CAD for FEA, how to mesh that CAD model and the different types of analysis that FEA programs can run.  The next step in the process is generating results from the FEA simulation, like the displacement illustration in Figure 1.  These are fantastic tools for generating useful reports, and are also very useful in helping an FEA consultant or engineer check the accuracy of the own results. As a [...]

FEA Consulting Part 5: Generating Results 2017-05-03T15:37:10+00:00

FEA Consulting Part 4: Simulation and Analysis

2017-05-05T10:07:54+00:00

Figure 1: Mesh, loads and constraints, ready for analysis © Glew Engineering Consulting, inc. 2016 Welcome again to our series on finite element analysis (FEA).  In the last blogs, I covered steps on setting up a computer-aided design (CAD) model and how to set up the mesh and boundary conditions, the most crucial steps in FEA simulation.  In this blog, I’ll look at the actual simulation and analysis, which can be the most time-consuming stage in the process. As a reminder, for an example I’ve been using a recent project we worked on involving punching shear in reinforced concrete.  We were examining the effectiveness of reinforcing a column-supported concrete slab against the possibility of that column punching through the concrete. Types of [...]

FEA Consulting Part 4: Simulation and Analysis 2017-05-05T10:07:54+00:00

FEA Consulting Part 3: Meshing and Boundary Conditions

2018-03-27T15:27:13+00:00

We'll continue on now with our blog series on finite element analysis (FEA).  After discussing how to best set up a computer-aided design (CAD) model for FEA simulation, in this blog I'll cover the next step: meshing the model and applying boundary conditions.  "Meshing" is the process by which the CAD model is separated into discrete finite elements; it can be done in the same program that runs the FEA numerical simulation later, or it might be performed in a standalone program, depending on your software.  Boundary conditions are the loads (forces, movements, impacts, etc) and constraints that interact to actually cause deformation and stress in each element, and in turn the model as a whole. Mesh Generation The mesh essentially [...]

FEA Consulting Part 3: Meshing and Boundary Conditions 2018-03-27T15:27:13+00:00

FEA Consulting Part 2: CAD Model Preparation

2017-05-02T16:56:01+00:00

Figure 1: Reinforced concrete mesh © Glew Engineering Consulting Welcome back to our blog series on FEA.  In the last blog entry, we introduced some of the fundamental concepts in finite element analysis (FEA).  This entry in the blog series focuses on the initial steps in preparing a computer-aided design (CAD) model ready for use in an FEA program.  Since FEA programs are very sensitive to the data they have to work with, it's important that the CAD models being analyzed are compatible with the analysis methods the FEA program uses. In order to illustrate my points throughout the blog series, I will introduce a recent FEA consulting project that we completed. Modeling Punching Shear in a Concrete Slab We were recently approached by an academic, who was examining [...]

FEA Consulting Part 2: CAD Model Preparation 2017-05-02T16:56:01+00:00

FEA Consulting Part 1: Introduction

2018-03-23T10:52:25+00:00

Figure 1: FEA mesh and shear stress results for a reinforced concrete slab © Glew Engineering Consulting, 2016 Finite Element Analysis Consulting (FEA) In this series of blogs on FEA, we will first cover some basic elements common to many FEA projects, and then in subsequent blogs in this series, illustrate those methods through examples. One of the services that Glew Engineering Consulting provides is finite element analysis consulting (FEA).  FEA consulting has been a great boon to the engineering profession, allowing mechanical engineers and civil engineers to accurately model the stress and strain behavior of complicated parts and assemblies prior to building physical prototypes.  FEA programs are capable of predicting the effects of loads and impacts, variations in temperature, changes in pressure, and [...]

FEA Consulting Part 1: Introduction 2018-03-23T10:52:25+00:00