## Category Archives: Varius

## Lability and hyperstaticity of a structure

A structure is labile if is possible to have a rigid cinematism, it is isostatic if is possible to calculate the reaction forces by the static equilibrium equations only, and it is statically indeterminate if it has an overabundance of … Continue reading

## Frequency Response – Nastran SOL 111

Frequency response is the quantitative measure of the output spectrum of a system or device in response to a stimulus, and is used to characterise the dynamics of the system. It is a measure of magnitude and phase of the … Continue reading

## Bending Moments and Deflections – 8

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## Bending Moments and Deflections – 7

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## Beam Bending Moments and Shear

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## Basic Constants

Mathematical Constants 3.141592653589793 e 2.718281828459045 Physical Constants Speed of light (c) 299,792,458 m/s Constant of gravitation (G) 6.67259×10-11 N-m2/kg2 Universal gas constant (R) 8,314.510 N-m/kmol-K Stefan-Boltzmann constant (s) 5.6704×10-8 W/m2-K4 Acceleration of gravity (g) 9.80665 m/s2 Standard atmosphere, sea level … Continue reading

## Vectors

This is a basic introduction to the mathematics of vectors. Vectors are defined as mathematical expressions possessing magnitude and direction, which add according to the parallelogram law. Forces, displacements, velocities, accelerations, and momenta are examples of physical quantities that … Continue reading

## Magnetic Propulsion

Today, electromagnetic propulsion (EMP) for submarines — a propellerless and therefore silent and maintenance-free way to drive a craft through water — is getting new attention. A hypothetical design for a 15-ton sub using this form of propulsion was presented … Continue reading

## Silent Sea Engine for Nuclear Subs

In the silent world of underwater warfare, the slightest noise can bring sudden death to a submarine. The electronic eats of the enemy can detect conventional engines and screw propellers as far as 100 miles away. A computer interprets the … Continue reading