# Are Lagrangians and Hamiltonians used by Engineers?

Analytical Mechanics (Lagrangian and Hamiltonian) are useful in Physics (e.g. in Quantum Mechanics) but are they also used in application, by engineers? For example, are they used in designing bridges or buildings?

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This question appears to be off-topic because it is about what tools engineers (not physicists) choose to use. –  Chris White Jul 5 '13 at 21:45

For static problems engineers use Strain Energy (see Castigliano's method). You might call it negative lagrangian. –  ja72 Jul 5 '13 at 14:36