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1500 questions
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2 answers

Unbraced Length for Lateral Torsional Buckling vs. Yield Strength

The AISC 360-10 Specification for Structural Steel Buildings gives provisions for calculating the maximum unbraced length of a compression flange that separates yielding moment from lateral torsional buckling (LTB). This formula is (AISC 360-10,…
grfrazee
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What is the justification for working on such large stretches of road?

I live and work in the UK, a country known for relentless roadworks. Last week I drove through roadworks on the M1 that lasted for 18 miles, necessitating road users driving at 50 mph. Of course, almost all of this impressive stretch was simply…
Phil
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How do I know if I need a pull up or pull down resistor for a GPIO pin?

I've seen many microcontrollers use pull up or pull down resistors either as a setting for GPIO pins or as part of the hardware. How do I know if I need a pull up or pull down resistor for a GPIO pin and if I do, how do I know which is right for my…
Dom
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Flash Corruption - Power Supply or X-ray Radiation?

I work with a system in which the microcontroller is exposed to X-ray radiation from time to time. Exactly how much radiation is hard to say... we've never measured it. Anyway, we've seen a mysterious form of flash corruption on a small sample of…
Nick
8
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1 answer

How can I increase my processor's ADC resolution?

I have an Atmel SAM4S MCU with a 12-bit internal ADC. I would like to achieve 16-bit resolution at a sample rate of 500 Hz. The input to the ADC is fairly low-frequency (about 20 Hz max frequency content), and low noise (less than one 12-bit lsb…
Patrick
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What IPC mechanisms exist for the i.MX 7 (or i.MX 6) multi-core processors?

I'm considering using the i.MX 7 processor for a new design. The overall architecture appears to be similar to the i.MX 6, at least from comparing the block diagrams. What mechanisms exist for communication between the Cortex-M4 core and the…
Patrick
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Is there an FPGA which could "re-wire" itself on the need?

For example, if there is many floating point operations, it could "rewire" the area of some of its integer units to handle floating point instructions, and vice versa. Or if there isn't too many calculations, but there is many I/O need, it could…
peterh
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What is the name of this particular mechanical linear position switch made of perforated spring strip?

I'm writing a few elementary paragraphs about switches and switch technology, and I cannot for the life of me remember what a particular kind is called, to give it an honorable mention. Here is a sketch of the switch in question: It is constructed…
Conrado
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Moment equation from dynamics differs with equations from physics & statics. Where did I go wrong?

In my dynamics class, we're being asked to solve the following problem: My Attempt: Since I'm given the initial velocity, final velocity, and distance, I solved for the acceleration of the plane using kinematics: $a = \frac{v_f^2 - v_i^2}{2d} =…
Chris Forsyth
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Large deflection of a cantilever beam with distributed normal load

I have a strip of stainless steel encastree'd at one end to which is applied a constant pressure on one side, and I need to know what the deflection equation y = f(x) is at equilibrium. If the deflection was small I would be able to use one of the…
Mister Mystère
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What are the meanings of the second argument to the convolution?

I was trying to understand the convolution better and its mathematical properties and interpretations in engineering (specially in the context of computer vision). Recall the convolution: $$ s(t) = (x * w)(t) = \int x(a) w(t-a) da$$ the first…
Charlie Parker
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SOLIDWORKS - 3D Sketch of Trombone

My task is to create a 3D Sketch of a trombone like the one below My professor recommended defining the points 1-4 and putting a spline through them. I did that, but my resulting design looks weird. It curves inward between points 1 and 2 before…
Melanie
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8 answers

Can I weaken a coil spring consisting of spring steel?

I have a steel coil spring that is used by compression. It is too strong, and I would like to reduce its strength by some fraction, ideally keeping its length. Reducing it to roughly half would be nice. Uncontrolled heating and cooling in air would…
Volker Siegel
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How can I find the emission power of a WiFi mobile phone antenna?

I need to find the emission power of a WiFi mobile phone antenna. I have checked the IEEE 802.11 specifications but it says that the power transmission is variable and depends on the mobile phone fabricant and power saving options. I also searched…
agonza1
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How does one become a control systems engineer?

From what I understand, a control systems engineering job is almost always a senior level position. What kind of entry level jobs do most engineers have before they are qualified to actually design control systems? Is a PE license necessary for this…
Guilty Spark
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