Method for calculating and analyzing working frequency on basis of sound transmission channel of drill string

The invention provides a method for calculating and analyzing the working frequency on the basis of a sound transmission channel of a drill string. The method for calculating and analyzing the working frequency on the basis of the sound transmission channel of the drill string includes simplifying a drill string model structure according to a drill string structure form; creating a calculation and analysis model according to the simplified drill string model structure; creating a model solution process on the basis of a transfer matrix process according to the calculation and analysis model and coupling the model solution process with influencing factors of underground drilling fluid to obtain a calculation and analysis formula; calculating and analyzing the drill string model structure to obtain a transmission band; and optimally selecting the working frequency according to the condition of a drilling construction site. The method for calculating and analyzing the working frequency on the basis of the sound transmission channel of the drill string has the advantages that shortcomings of the traditional method on the basis of a periodic string structure model in aspects of calculation applicability and calculation precision are overcome, and theoretical support is provided for designing relevant underground instruments and equipment, suppressing attenuation of signals in a sound signal transmission procedure, reducing interference of an underground environment and detecting effective sound signals.