... direction (fig. 2 ). Mathematically, position x(t), velocity v(t) and acceleration a(t) for sinusoidal vibration are described as x(t) = A sin ( ω t),   v(t) = A ωcos ( ω t),   a(t) = – A ω 2 sin ( ω t) (5) Hemofiltration Hemodiafiltration Vibration Mechanical stress...