Eccentric mass vibrating system

A method for the control of an eccentric mass vibrating system having a first motor with a first eccentric mass and a second motor with a second eccentric mass, the method comprising the steps of:

• positioning said system on an object to be vibrated, wherein the object to be vibrated is a structure made of electrowelded composite fabrication work, and the eccentric mass vibrating system is configured to reduce residual tensions in the object to be vibrated;
• associating at least one sensor with the object to be vibrated, wherein said at least one sensor is an accelerometer or an ammeter or a microphone;
• positioning said first eccentric mass and said second eccentric mass phase shift from each other by a first predefined angle;
• varying the speed of said first motor and said second motor between a first number of revolutions and a second number of revolutions, wherein the speed of said first motor and said second motor is varied within a predefined range;
• checking a value measured by said at least one sensor;
• varying said first predefined angle if the value measured by said at least one sensor exceeds a predefined value;
• reducing the phase shift between the first eccentric mass and the second eccentric mass in a case of a resonance in which vibrations, noise, or motor absorption is excessive and exceeds predefined reference values;
• and
• obtaining resonance frequencies of the object to be vibrated corresponding to the speed of said first motor and said second motor, and relative maximum phase shift angles between the first eccentric mass and the second eccentric mass.

An eccentric mass vibrating system comprising:

• a first motor having a first shaft;
• a first eccentric mass connected to said first shaft;
• a second motor having a second shaft;
• a second eccentric mass connected to said second shaft;
• said first motor and said second motor are adapted to be associated with an object to be vibrated;
• wherein:
• said object to be vibrated is a structure made of electrowelded composite fabrication work;
• said eccentric mass vibrating system is configured to reduce residual tensions in said object to be vibrated;
• said first motor and said second motor being electrically adjustable so as to arrange said first eccentric mass and said second eccentric mass at a predefined angle therebetween;
• said first motor and said second motor being adapted to be positioned on said object to be vibrated;
• and
• said first motor and said second motor are made to rotate from a first speed to a second speed, wherein the speed of said first motor and said second motor is varied within a predefined range;
• at least one sensor associated with said object to be vibrated, wherein said at least one sensor is an accelerometer or an ammeter or a microphone;
• and
• a control computer of said system adapted to modify said predefined angle if the value measured by said at least one sensor exceeds a predefined value, wherein:
• the control computer is adapted to reduce a phase shift between the first eccentric mass and the second eccentric mass in the case of a resonance in which vibrations, noise, or motor absorption is excessive and exceeds predefined reference values;
• the control computer is adapted to obtain resonance frequencies of the object to be vibrated corresponding to the speed of said first motor and said second motor, and relative maximum phase shift angles between the first eccentric mass and the second eccentric mass;
• and
• the object to be vibrated is adapted to start a treatment cycle in an automatic mode, wherein the treatment cycle comprises automatically applying maximum phase shift values for each vibration frequency to be treated to the first eccentric mass and the second eccentric mass.