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Rotation motion of particles in sound field

Didenkulov I., Ezersky A., Selivanovsky D., Chernov V.

Hydroacoustics

2003

Vol. 6

167--170

It is known that sound field produces longitudinal oscillation motion of medium. If there are floating particles in a medium those particles oscillate together with liquid. In this paper we consider dynamics of floating particles, which have rotational oscillations in acoustic field. This novel phenomena produces additional sound attenuation due to viscous damping. In the present paper this effect is analytically described. The expression for sound attenuation in suspensions of such particles and estimations of the value of the effect are obtained, and possible applications are discussed.

Methodology of the stepper motor rotational motion investigations

Wawszczak W., Towarek Z., Jagiełło B.

Mechanics and Mechanical Engineering

2002

Vol. 6, nr 1

73-80

Advantages and disadvantages of separate studies on dynamic systems using either theoretical or experimental methods have been emphasized, and a standpoint has been expressed dial both methods must definitely be combined. Measurements of vibration in the rotational motion by means of an RWJ instrument served as the methodology of experimental studies, while Lagrange quadratic equations were used for theoretical analysis. The combined experimental-theoretical methodology was adopted for the non-stationary motion of a stepper motor. The analysis and reduction of the system of equations of dynamics for an inverse issue have been presented and selected experimental solutions for the motion of the drive system of a stepper motor has been quoted.