(Figure 1 - Electric Vehicle on Fire) Electric Vehicle Battery Materials Most electric vehicle batteries are lithium based and rely on a mix of cobalt, manganese, nickel, and graphite and other primary components, can be very dangerous, battery fires could occur (See Figure 1. Above). Some of these materials are harder to find than others, though none should be classified as "rare earth metals" ( http://glewengineering.com/the-impact-of-chinese-export-restrictions-on-rare-earth-elements/) . Over 60% of the global supply for cobalt comes from the Democratic Republic of Congo (DRC), which has a poor human rights track record; international organizations have denounced for years the exploitative labor practices involved in cobalt production. Cobalt deposits can be found throughout the world and are most prominent in the African Copper [...]
Think You Know NAND Flash? NAND flash has become the de facto memory standard in the years since Toshiba first introduced it almost three decades ago. However, many misconceptions remain to this day about its use. A wide variety of NAND flash-memory products are available, all with significantly different features and capabilities. All NAND flash has the same interface. NAND flash, introduced by Toshiba more than 20 years ago, is available in both the asynchronous and toggle-mode interfaces. The original asynchronous interface is found mostly in lower-density devices (<32 Gb), while high-density NAND flash (≥64 Gb) is typically used in the toggle-mode interface.( http://glewengineering.com/tester-prober-interfaces-direct-probe-part-1/ UFS memory is primarily just for smartphones. Universal Flash Storage (UFS), while smartphones [...]
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Italian Masters: Leonardo da Vinci – Artist, Engineer, Scientist GalleryElectrical Engineering, Engineering Consulting, Expert Witness, Finite Element Analysis, Licensed Mechanical Engineer, Mechanical Engineering, Mechanical Engineering Consulting
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, [...]
12 Years a Martian: Engineering Challenges on the Red Planet GalleryCAD, Electrical Engineering, Engineering Consulting, Expert Witness, Licensed Mechanical Engineer, Materials Science, Mechanical Engineering, Mechanical Engineering Consulting, Thermal Management
Figure 1: Mars Exploration Rover By NASA/JPL/Cornell University, Maas Digital LLC [Public domain], via Wikimedia Commons Depending on which Facebook pages or Twitter feeds you follow, some of you may have caught wind that Opportunity (Mars Exploration Rover B, Figure 1) recently passed its twelfth anniversary of its landing on the red planet. Opportunity’s ongoing trek across Mars represents a fantastic accomplishment in engineering. At the time I’m writing this, the rover has been in continual operation for over 4,300 Earth days (that’s about 4,185 Sols, or Martian days). Considering its original planned mission time of 92 Earth days, Opportunity has exceeded its design lifetime by 4,700%. Imagine having a car that, instead of a [...]
Figure 1: Giovanni Domenico Cassini We’ve been taking a break from hard-hitting mechanical engineering and materials science blogs with some pieces on the Italian masters of science, mathematics and engineering in the 16-19th centuries. In previous blogs, I explored the lives and contributions of mathematician/physicist Evangelista Torricelli and physicist/engineer Giovanni Venturi. For this blog, I'm focusing on Giovanni Domenico Cassini (Figure 1), a structural engineer and astronomer extraordinaire in the late 17th century. Cassini started small, studying astrology (not astronomy!) early on in his career, but his fascination with the actual scientific properties of our celestial neighbors and his lifelong dedication to watching the night sky led him to a number of great discoveries. Giovanni Domenico Cassini (1625-1712) Giovanni Domenico Cassini [...]
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 [...]
Figure 1: Giovanni Battista Venturi [i] Glew's News is doing a short series highlighting the lives and accomplishments of the Italian Masters of science, engineering, and mathematics. In the last blog, I wrote about Evangelista Torricelli, a mathematician and physicist from the 17th century. In this blog, I'm focusing on Giovanni Venturi (Figure 1), an accomplished physicist, hydrodynamicist and engineer. Giovanni Battista Venturi (1746-1822) Giovanni Venturi was born to a wealthy family in Reggio, Italy in 1746. A talented young student, by the age of 23 the local seminary had already ordained him as a priest and professor. His talents in mathematics didn’t long escape notice at the nearby University of Modena, which appointed him as a professor of geometry and [...]
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 [...]
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 [...]
Valve specification and design for high purity semiconductor equipment.
Mechanical engineers at MIT created a new material made from polyurethane foam and wax, which may find application for "soft" robots.
The Engineer's kitchen this week discusses the using liquid nitrogen as it pertains to the thermal management of ingredients in the culinary arts.
The Engineer’s Kitchen: Wine and Pepper Tri-Tip GalleryCooking for Engineering, Electrical Engineering, Energy Efficiency, Engineering Consulting, Finite Element Analysis, Heat transfer, Licensed Mechanical Engineer, Materials Science, Mechanical Engineering Consulting, Mechanical Engineers
Here in our weekly cooking blog, The Engineer's Kitchen, we create summer BBQ with a recipe for wine and pepper tri-tip with a creamy potato salad