Since the rod is rigid, the position of the bob is constrained according to the equation f(x,y)=0, the constraint force is C, and the one degree of freedom can be described by one generalized coordinate (here the angle theta). I am slightly reminded of this when discussing Hamilton’s principle in dynamics We calculate the virtual work done and set it to zero. ![]() When using the principle of virtual work in statics we imagine starting from an equilibrium position, and then increasing one of the coordinates infinitesimally.
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