摘要
运用等效理论对矩形镍铬钢薄板和铝蜂窝夹层板弯曲振动进行分析,并通过实验验证:辐射板的最低本征频率正相关于换能器的起始发射频率,辐射板的模态密度正相关于换能器带宽.采用铝蜂窝夹层板作为辐射板的超声换能器,在5 V的信号激励下,起振频率为15 kHz,带宽为15～45 kHz,辐射声压级为95 dB,声压级起伏不超过±5 dB.而且具有薄型的优点,厚度不大于2 mm,辐射面积不大于500 mm2,水平辐射声压级无指向性.
The equivalent theory was used to analyze the flexural vibration of the nickel steel plate and the aluminum honeycomb sandwich plate. Experimental research proves that the lowest eigen frequency of the plate is proportional to the start transmitting frequency of transducers, and the modal density of the plate is proportional to the bandwidth of transducers. A ultrasonic transducer has been designed with an aluminum sandwich plate： under the 5 V signal, the start transmitting frequency is 15kHz, the bandwidth is 15 ~ 45 kHz, the sound pressure level is 95 dB, and the fluctuation of SPL is less than 5dB. However, the transducer is thin, the thickness is less than 2ram, the transmitting area is less than 500 mm2, and the transmitting sound signal is omnidirectional.
出处
《广东工业大学学报》
CAS
2012年第4期33-38,共6页
Journal of Guangdong University of Technology
基金
国家自然科学基金资助项目(41176034)
广东省自然科学基金资助项目(10151009001000052)
关键词
薄型换能器
铝蜂窝夹层板
本征频率
模态密度
弯曲振动
thin panel transducers
aluminum honeycomb sandwich plate
eigen frequency
modal density
flexural vibration
