Apparatus and method for generating, measuring, and evaluating vibrational modes in cylindrical objects

An apparatus for determining a structural quality of a cylindrical element, comprising:

• processing circuitry configured to
• measure, as a result of a single applied force, surface vibrations of the cylindrical element via four or more surface transducers arranged on the cylindrical element along a circumference of the cylindrical element, the four or more surface transducers being equally spaced along the circumference of the cylindrical element,
• process digital signals corresponding to each of the four or more surface transducers in order to generate a composite digital signal,
• transform the composite digital signal to a frequency domain,
• compare the transformed composite digital signal to a reference composite digital signal, and
• determine, based on the comparing, the structural quality of the cylindrical element.

A non-transitory computer-readable storage medium storing computer-readable instructions that, when executed by a computer, cause the computer to perform a method for determining a structural quality of a cylindrical element, comprising:

• measuring, as a result of a single applied force, surface vibrations of the cylindrical element via four or more surface transducers arranged on the cylindrical element along a circumference of the cylindrical element, the four or more surface transducers being equally spaced along the circumference of the cylindrical element;
• processing digital signals corresponding to each of the four or more surface transducers in order to generate a composite digital signal;
• transforming the composite digital signal to a frequency domain;
• comparing the transformed composite digital signal to a reference composite digital signal;
• and
• determining, based on the comparing, the structural quality of the cylindrical element.