Apparatus and method for controlling the frequency of...

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G - Physics

05

D

341/71

G05D 19/02 (2006.01) E01C 19/28 (2006.01)

Patent

CA 2039751

Abstract of the Disclosure Apparatus and Method for Controlling the Frequency of Vibration of A Compacting Machine An apparatus and a method are provided for controlling the frequency of vibration of a compacting machine. The frequency contxol is carried out by the apparatus which determines the actual time at which a ground contacting member of the compacting machine is at its true vertically lowest position. This is determined by measuring the time at which the vertical acceleration of the ground contaoting member has a maximum value during one rotation of an eccentrically mounted, vibration inducing mass. The time difference between the tims at which the vibration inducing eccentric mass is at a predetermined position and the time at which the acceleration of the ground contacting member is at the maximum value is used to calculate a phase angle relationship (?) between the ground contacting member and the eccentrically attached member. This method of determining the phase angle relationship (?) between the two members provides an accurate parameter for controlling the frequency of vibration imparted to a compactible material by the compacting machine. T:\RAM\89-350.doc

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