Vibration excitation equipment for entire acoustic vibration of violin and system and method for measuring frequency spectrum

Abstract

The invention discloses vibration excitation equipment for the entire acoustic vibration of a violin and a system and method for measuring a frequency spectrum. The vibration excitation equipment comprises a voice frequency signal generator, a power amplifier, a giant magnetostrictive transducer, a string pulling arm and a violin case attaching clamp. According to the measuring method, the method that strings are pulled by the giant magnetostrictive transducer to excite the vibration of violin bridges is introduced, firstly, the giant magnetostrictive transducer and the string pulling arm respectively pull the G string, the D string, the A string and the E string and excite the vibration of a violin case under the control of voice frequency signals, and then a spectrogram is generated by means of acoustic measurement and a computer spectral analysis technique. The vibration excitation equipment for the entire acoustic vibration of the violin and the system and method for measuring the frequency spectrum simulate the motion states, such as the torsional pendulum vibration in the horizontal direction and the alternate vibration in the perpendicular direction, of the violin when the violin is played and the violin bridges are pulled under the vibration of the violin strings, the measuring environment is similar to the actual playing state of the violin, and the accuracy and scientificity of the frequency spectrum measurement result are improved. Meanwhile, feasible technological approaches are offered to tone adjustment, acoustical quality objective evaluation and the like in the manufacturing processes of the violin.

Description

technical field [0001] The invention relates to the fields of musical instrument production and acoustic quality testing, in particular to a violin string pulling excitation device and an overall acoustic vibration spectrum measurement system and measurement method. Background technique [0002] With the application of computer technology and digital signal technology in the field of violin acoustic research, people have a deeper understanding of the vibration principle of the violin. American physicist C.M. Hutchins used finite element analysis to obtain the data results of the overall hologram of the violin case. In 2006, Dr. George Bissinger of East Carolina University in the United States used a three-dimensional laser vibration measuring instrument to draw the vibration of three famous Italian violin cases. These studies have comprehensively explained the process of violin vibration and its acoustic principles, and promoted the application and popularization of modern s...

AI Technical Summary

Problems solved by technology

It is not difficult to see that this method ignores the vibration of the strings, and the introduction point of the excitation is the saddle. Although no additional mass is added to the saddle, the measurement results basically reflect the composite vibration of the saddle and the piano case, but this This measurement method still has certain limitations. People have found that in use, the pulse hammer is used to strike the bridge from different angles, and the measurement results are somewhat different. The reason for the measurement uncertainty lies in: the four strings of the violin The tension of the piano is about 50 pounds. When the strings vibrate, the saddle is pulled by the strings, and there is not only a forward and backward twisting movement (the direction of the strings), but also an up and down movement of the saddle feet (vertical direction of the panel), Joseph Curtin's excitation method can only make the saddle vibrate up and down in the vertical direction of the panel, but cannot simulate the torsional vibration of the saddle before and after, so it cannot fully reflect the real situation of the overall vibration of the violin in the playing state

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