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Virtual forces and stresses as variations of the real forces and stresses. Virtual forces be zero on the part of the surface that has prescribed forces, and thus only surface (reaction) forces on (where displacements are prescribed) would do work. The virtual work equation becomes the principle of virtual forces:
Generalized forces can be obtained from the computation of the virtual work, δW, of the applied forces. [1]: 265 The virtual work of the forces, F i, acting on the particles P i, i = 1, ..., n, is given by = = where δr i is the virtual displacement of the particle P i.
This was a useful warning of a dangerous flight condition. Servo systems tend to be "one-way", meaning external forces applied aerodynamically to the control surfaces are not perceived at the controls, resulting in the lack of this important sensory cue. To address this, the missing normal forces are simulated with springs and weights.
The inputs to the classical washout filter are vehicle-specific forces and angular rate. Both of the inputs are expressed in the vehicle-body-fixed frame. Since low-frequency force is dominant in driving the motion base, force is high-pass filtered, and yields the simulator translations. Much the same operation is done for angular rate.
In such a situation, a force is applied in the direction of motion while the kinetic friction force exactly opposes the applied force. This results in zero net force, but since the object started with a non-zero velocity, it continues to move with a non-zero velocity. Aristotle misinterpreted this motion as being caused by the applied force.
Static force fields are fields, such as a simple electric, magnetic or gravitational fields, that exist without excitations.The most common approximation method that physicists use for scattering calculations can be interpreted as static forces arising from the interactions between two bodies mediated by virtual particles, particles that exist for only a short time determined by the ...
Basset force for describing the effect of the body's relative motion history on the viscous forces in a Stokes flow; Basset–Boussinesq–Oseen equation for the description of the motion of – and forces on – a particle moving in an unsteady flow at low Reynolds numbers; Darwin drift for the relation between added mass and the Darwin drift ...
The virtual displacements, δr k, are by definition infinitesimal changes in the configuration of the system consistent with the constraint forces acting on the system at an instant of time, [22] i.e. in such a way that the constraint forces maintain the constrained motion. They are not the same as the actual displacements in the system, which ...