Acoustic performance calculation device, acoustic performance calculation method, and acoustic performance calculation program

An acoustic performance calculation method executed by a processor, the method comprising:

• calculating acoustic performances of an acoustic material for each of a plurality of values existing within a pre-specified numerical range for one type of material parameter among a plurality of material parameters characterizing the acoustic material based on a mathematical model for mathematically representing the acoustic material;
• drawing a contour map, which represents the calculated acoustic performance by contours with different colors differing according to values of the acoustic performance by using the values of the one type of material parameter and a frequency as values taken on two axes, and drawing, on the contour map, a straight line-shaped cursor parallel to a frequency axis of the contour map and a display of the value of the one type of material parameter indicated by the cursor;
• drawing performance curves which represent a relationship between the frequency and the acoustic performance for one value within the numerical range on a plot;
• changing a position of display of the cursor on the contour map and a display of the value of the one type of material parameter according to a user input;
• and
• drawing performance curves corresponding to the display of the changed value of the one type of material parameter on the plot.

A nontransitory computer readable medium encoded with an acoustic performance calculation program including instructions which, when executed by an acoustic performance calculation device, cause the acoustic performance calculation device to perform operations comprising:

• calculating acoustic performances of an acoustic material for each of a plurality of values existing within a pre-specified numerical range for one type of material parameter among a plurality of material parameters characterizing the acoustic material based on a mathematical model for mathematically representing the acoustic material;
• drawing a contour map, which represents the calculated acoustic performance by contours with different colors differing according to values of the acoustic performance by using the values of the one type of material parameter and a frequency as values taken on two axes, and drawing, on the contour map, a straight line-shaped cursor parallel to a frequency axis of the contour map and a display of the value of the one type of material parameter indicated by the cursor;
• drawing performance curves which represent a relationship between the frequency and the acoustic performance for one value within the numerical range on a plot;
• changing a position of display of the cursor on the contour map and a display of the value of the one type of material parameter according to a user input;
• and
• drawing performance curves corresponding to the display of the changed value of the one type of material parameter on the plot.

An acoustic performance calculation device comprising:

• a processor configured to:
• calculate acoustic performances of an acoustic material based on respective values of a plurality of material parameters characterizing the acoustic material based on a mathematical model which mathematically represents the acoustic material and determine an evaluation function by which one specific selected material parameter is to be optimized, based on a relationship between the calculated acoustic performances and another acoustic performance for comparison;
• and
• calculate an optimum solution for the one specific selected material parameter by solving an optimization problem for minimizing or maximizing the determined evaluation function by using a specific optimization method,
• wherein determination of the evaluation function and calculation of optimum solutions are executed for each of the plurality of material parameters,
• wherein the processor is configured to calculate a cross correlation function of the calculated acoustic performance and another acoustic performance for comparison, configured to calculate acoustic performance differences between the calculated acoustic performance and another acoustic performances for comparison, and configured to determine the evaluation function based on the cross correlation function and the acoustic performance differences.

An acoustic performance calculation method comprising executing the following steps on each of a plurality of material parameters characterizing an acoustic material:

• an evaluation function determination step of calculating acoustic performances of the acoustic material based on respective values of the plurality of material parameters based on a mathematical model which mathematically represents the acoustic material and of determining an evaluation function by which one specific selected material parameter is to be optimized, based on a relationship between the calculated acoustic performances and another acoustic performance for comparison;
• and
• an optimization step of calculating an optimum solution for the one specific selected material parameter by solving an optimization problem for minimizing or maximizing the evaluation function determined by the evaluation function determination step by using a specific optimization method,
• wherein the evaluation function determination step comprises calculating a cross correlation function of the calculated acoustic performance and another acoustic performance for comparison, calculating acoustic performance differences between the calculated acoustic performance and another acoustic performances for comparison, and determining the evaluation function based on the cross correlation function and the acoustic performance differences.

A nontransitory computer readable medium encoded with an acoustic performance calculation program including instructions which, when executed by an acoustic performance calculation device, cause the acoustic performance calculation device to perform executing the following steps on each of a plurality of material parameters characterizing an acoustic material:

• an evaluation function determination step of calculating acoustic performances of the acoustic material based on respective values of a plurality of material parameters based on a mathematical model which mathematically represents the acoustic material and of determining an evaluation function by which one specific selected material parameter is to be optimized, based on a relationship between the calculated acoustic performances and another acoustic performance for comparison;
• and
• an optimization step of calculating an optimum solution for the one specific selected material parameter by solving an optimization problem for minimizing or maximizing the evaluation function determined by the evaluation function determination step by using a specific optimization method,
• wherein the evaluation function determination step comprises calculating a cross correlation function of the calculated acoustic performance and another acoustic performance for comparison, calculating acoustic performance differences between the calculated acoustic performance and another acoustic performances for comparison, and determining the evaluation function based on the cross correlation function and the acoustic performance differences.