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Mounting a pcb at a different angle than mold direction

We have a problem with mounting a PCB at a different angle than the mold direction angle. I have graphic below to help explain. If we were to build standoffs at the same angle as the mold direction but we need that PCB to be 90 degrees from the…
Tim T
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How does infill material affects the capacity of a tubular section with H-section inside?

How does one consider the moment capacity of a combined pipe plus H-section if the infill material is: Sand, friction angle 30 degree Grout, C20 Concrete, C45 Eurocode has a section on composite design, which requires use of shear connectors.…
Jennifer
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Laser Cutting backing material instead of grid?

My research group recently purchased a 40W CO2 laser cutter. We work in the biosensing field and some of the materials we wish to cut are very thin nano/micro fibers that will be cut into relatively small pieces. When cutting the material we hope to…
Nick Law
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Holonomic constraint forces using Lagrange multipliers

Consider a multibody robotic system with Lagrangian $$ L =\frac{1}{2} \dot{q}^{T}M\dot{q} - V $$ and equations of motion of the form $$M(q)\ddot{q}+C(q,\dot{q})\dot{q}+A^{T}(q)\lambda+N(q)=0 $$ where $N=\frac{\partial V(q)}{\partial q}$ and…
Leo
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Is it possible to make very large diamonds using a pressure vessel at several GigaPascal pressure?

Nanocrystalline diamonds can be synthesized by direct conversion of graphite or carbon black mixed with low amount of boron (0.1%-10%) at 8-10 GPa, according to US patent No.20120255236. If some scientists decided to make very large monolithic…
anameen
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dSPACE compiler linker error -- fscanf undefined

I'm dealing with a somewhat intractable problem. We're running dSPACE 7.4 (RTI 1006) on MATLAB 2011a, which I understand uses the dSPACE DS1006 C Compiler v. 2.2. When I try to compile one of our models, I wind up with a linker error claiming that…
ZStamler
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Understanding a Caterpillar Excavator Recomendation for Increasing Life

I am trying to understand / interpret one recommendation I read on a Caterpillar website for maximizing excavator life: ** Never dig over final drive. ** Can anyone explain what this means? What's the "final drive" and what does digging over it…
curious_cat
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How they put heavy cranes on top of the building?

I saw crane on very tall building. How do they put such heavy item on such high building?
The Hawk
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Longitudinal impact of steel rod on a steel plate to verify the contact duration

So I'm doing an experiment to verify the contact duration when a steel rod (Material: Mild Steel) is allowed to free fall longitudinally on a steel plate. The arrangement is real simple: The rod is allowed to fall longitudinally on the plate,…
Aswin James
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Why not design a Wind Turbine like an Anemometer?

Anemometer measures wind speed. It's shaped with little cups---hollow half-spheres. That looks very logical as the cups grab the wind and the other side is rather streamligned to cut through the air as it spins. So why are there no wind turbines…
DrZ214
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How to compare dynamic systems of different degree of abstraction?

I'm modelling a vehicle as a multibody system in Matlab/Simulink. My goals are: Have a realistic simulation model so I don't have to do prototype measurements all the time. Solve specific parameter estimation tasks and apply driver assistance…
Marius Oei
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Which one is preferable? Multiple layers of reinforcements or one layer of reinforcement?

For RC beams, which one is preferable to be designed for construction? Is it multiple layer of reinforcements or one single layer? and why? Eg. If the beam required 3T20, is it preferable one layer of 3T20 or multiple layers: 2T16+3t16? Thanks
L4Legit
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Is the viscosity solution of Hamilton-Jacobi equation of practical use in optimal control?

My understanding is, given an optimal control problem, one can show that the optimal cost satisfies a Hamilton-Jacobi PDE and use dynamic programming to figure out the optimal control. However, sometimes this PDE has no strong solution, and the deep…
Isley
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Minimal realization of a MISO system

Given the following system: $$\dot{x} = \begin{bmatrix}1 & 1 & 0 \\ 0 & 1 & 0 \\ 0 & 1 & 1 \end{bmatrix}x + \begin{bmatrix}0 & 1 \\ 1 & 0 \\ 0 & 1 \end{bmatrix} u$$ $$y = \begin{bmatrix}1 & 1 & 1 \end{bmatrix} x$$ I need to find the minimal…
Unnamed
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Quantifying and measuring friction under extreme conditions

I want to quantify friction between a bullet and barrel to test different friction-proofing coatings and treatments. Is there a controlled test I could do at low speeds in a lab between samples of treated copper and steel that would be theoretically…
feetwet
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