The Evaluation System Of Guitar Soundboard Based On EMI And ANN Technology

The EMI technology was mainly used for the crack damage degree of the beam,the degree of corrosion of the workpiece,the fracture degree of the concrete block and so on.The study of EMI technology at present is the impedance characteristics of the same object in different states.The research on the impedance characteristics of different objects under the same state and the same attribute is basically not.In this paper,the natural frequency under the dynamic characteristics of the object is used as the basic parameter for the identification of the structure.1)The piezoelectric equations of a piezoelectric material under both positive effect and negative effect was analyzed.The relationship between the coupling electrical impedance of the circular PZT,the coupling mechanical impedance and the mechanical impedance of the guitar was analyzed.The two degree of freedom model and the motion equation of the guitar soundboard are given.The main parameters affecting the nature frequency of the guitar soundboard are obtained from motion equation.2)The guitar string of harmonic was analyzed,the frequency and amplitude of the 1st string are obtained.The modal of the guitar soundboard was analyzed.The guitar soundboard material and the sound hole size of the guitar soundboard as variables for modal analysis,the influence of the guitar structure parameters on the natural frequency of the soundboard is obtained.3)The simple voice analysis system was built by using INV5633A sound level meter and NI high speed acquisition card.Impedance analysis of the guitar soundboard was carried out in the frequency range of the bass area,the middle tone area,the high tone area and the two region of the high tone using WK6500B precision impedance analyzer.4)The neural network technology was used to quantify the measured impedance data,digital impedance data with dynamic characteristics as a standard for evaluating the same type of guitar soundboard.The amplification effect of the guitar soundboard was evaluated according to the frequency range of the bass area,the middle tone area,the high tone area and the two region of the high tone.