Multi-Channel Active Control System and Methods for the Reduction of Tonal Noise from an Axial Fan

A method of optimizing placement of a control source relative to a primary noise source, comprising:

• establishing a first pool of constructive chromosomes, each constructive chromosome defining a potential spatial position for the control source in an acoustic space and each constructive chromosome including a plurality of constructive genes, each constructive gene having a value-based value that represents an ordinate related to the potential spatial position;
• establishing a second pool of constructive chromosomes by manipulating the value-based values of a portion of the plurality of constructive genes from at least a portion of the plurality of constructive chromosomes of the first pool to create a plurality of modified constructive chromosomes;
• mutating a portion of the plurality of constructive genes from a portion of the constructive chromosomes from the first pool and/or the second pool by randomly changing at least one of the values of the value-based values;
• evaluating a fitness characteristic of at least some of the constructive chromosomes from the first pool and/or at least some of the constructive chromosomes from the second pool;
• eliminating a portion of the constructive chromosomes from the first pool and/or the second pool based on the fitness characteristic;
• and
• repeating steps of establishing the second pool, evaluating, and eliminating to obtain an optimized placement for the control source.

A method of optimizing placement of a control source relative to a primary noise source in an active noise control system, comprising:

• establishing a first pool of constructive chromosomes, each constructive chromosome defining a potential spatial position for the control source in an acoustic space and each constructive chromosome including a plurality of constructive genes, each constructive gene having a value-based value that represents an ordinate related to the potential spatial position;
• establishing a second pool of constructive chromosomes by manipulating value-based values of constructive genes from at least a portion of the plurality of constructive chromosomes of the first pool to create a plurality of modified constructive chromosomes, wherein manipulating includes applying a function to at least one of the value-based value from parent chromosome to create one child chromosome;
• evaluating a fitness characteristic of at least some of the constructive chromosomes from the first pool and/or at least some of the constructive chromosomes from the second pool;
• eliminating a portion of the constructive chromosomes from the first pool and/or the second pool based on the fitness characteristic;
• and
• repeating steps of establishing the second pool, evaluating, and eliminating until an optimized placement for the control source is determined.