Piano soundboard ultrasonic vibration stress relief method based on impedance technique and experiment device

Abstract

The invention discloses a piano soundboard ultrasonic vibration stress relief method based on impedance technique and an experiment device. The experiment device is characterized in that the experiment device comprises an impedance analyzer, a piano soundboard, a first piezoelectric sensor, a second piezoelectric sensor, a third piezoelectric sensor, a fourth piezoelectric sensor, a four-channel signal generator and a computer and software processing system thereof. The experiment device is simple in structure and reasonable in design; the excitation frequency is characterized by scanning thepiano soundboard in an ultrasonic band through the impedance analyzer, and accurately finding inherent frequency of the piano soundboard in the ultrasonic band; during ultrasonic vibration stress relief, the inherent frequency in the ultrasonic band is directly loaded to the piezoelectric sensors, thereby reducing damage of the ultrasonic vibration stress relief to the piano soundboard; since no power amplifier is adopted, energy consumption of ultrasonic vibration stress relief is only 10% of that of ordinary vibration stress relief, and energy consumption of ultrasonic vibration stress relief is greatly reduced; and meanwhile, the ultrasonic vibration stress relief is carried out in the ultrasonic band, so that noise is very small and working environment is greatly improved.

Description

technical field [0001] The invention relates to the fields of impedance technology and piano production technology, in particular to a piano soundboard ultrasonic vibration aging method and experimental device based on impedance technology. Background technique [0002] First of all, the piano soundboard is very important. It is composed of a wooden soundboard with nearly 230 strings and its cast iron frame. The amplification of the piano volume depends on the piano soundboard. More than 220 strings are divided into several groups to form a string system: the average tension of each string is about 90 kg, and the total tension of the whole piano is about 20 tons. Since the strings, the iron frame and the soundboard are all elastic, they become a comprehensive elastic body with great internal stress after the strings are tightened. It vibrates and produces pleasant music. Because the internal stress of this comprehensive elastic body is very large, and it will be affected by...

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Problems solved by technology

If this change is not standardized and corrected, the term change will make the pitch of the whole piano in a state of confusion.

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