Patent ID: 7650925

Claim:
A method to reduce the causes of variability and defects in thin cast metal strip during a twin roll casting process comprising: continuously measuring a first force-related parameter selected from the group consisting of force, strain, acceleration and pressure, at a first end of a first casting roll of a twin roll caster system, and a second force-related parameter selected from the group consisting of force, strain, acceleration and pressure, at said same first end of a second casting roll of said twin roll caster system to form a first time domain signal and a second time domain signal, respectively; continuously measuring a third force-related parameter selected from the group consisting of force, strain, acceleration and pressure, at an opposite second end of said first casting roll and a fourth force-related parameter selected from the group consisting of force, strain, acceleration and pressure, at said same opposite second end of said second casting roll to form a third time domain signal and a fourth time domain signal, respectively; transforming said first time domain signal into a first frequency domain spectrum, said second time domain signal into a second frequency domain spectrum, said third time domain signal into a third frequency domain spectrum, and said fourth time domain signal into a fourth frequency domain spectrum; and continually calculating a composite intensity value for a given frequency range from the intensity levels of frequency component signals from one of the frequency domain spectrum that are present in the given frequency range.