玻璃微珠在夹紧弹性板上振动的非线性调谐曲线和双音测试

Proc. Meet. Acoust. Pub Date : 2018-11-01 DOI:10.1121/2.0000896

Emily V. Santos, M. Korman

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引用次数: 0

摘要

土板振子(SPO)装置由两个圆形法兰夹紧一个圆形弹性薄板组成。该装置可以模拟声地雷探测问题。均匀的球形玻璃珠——代表一种非线性介观弹性材料——由亚克力板(直径4.5英寸，1/8英寸厚)和上部法兰的刚性圆柱形侧壁支撑在底部。盘面居中并固定在板的下方，由放置在磁铁下方的交流线圈驱动。通过向恒流放大器施加扫频正弦信号驱动线圈，测量了磁体加速度的非线性调谐曲线。在双音测试中，来自直径3英寸扬声器的空气传播的声音以接近基本共振的紧密间隔频率驱动柱头表面。对每一个磁珠直径实验的非线性合成频率进行了比较。土板振子(SPO)装置由两个圆形法兰夹紧一个圆形弹性薄板组成。该装置可以模拟声地雷探测问题。均匀的球形玻璃珠——代表一种非线性介观弹性材料——由亚克力板(直径4.5英寸，1/8英寸厚)和上部法兰的刚性圆柱形侧壁支撑在底部。盘面居中并固定在板的下方，由放置在磁铁下方的交流线圈驱动。通过向恒流放大器施加扫频正弦信号驱动线圈，测量了磁体加速度的非线性调谐曲线。在双音测试中，来自直径3英寸扬声器的空气传播的声音以接近基本共振的紧密间隔频率驱动柱头表面。对每一个磁珠直径实验的非线性合成频率进行了比较。

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Nonlinear tuning curve and two-tone tests using glass beads vibrating over clamped elastic plate

A soil plate oscillator (SPO) apparatus consists of two circular flanges sandwiching and clamping a thin circular elastic plate. The apparatus can model the acoustic landmine detection problem. Uniform spherical glass beads – representing a nonlinear mesoscopic elastic material – are supported at the bottom by the acrylic plate (4.5 inch diam, 1/8 inch thick) and stiff cylindrical sidewalls of the upper flange. A magnetic disk centered and fastened below the plate is driven by an AC coil placed below the magnet. Nonlinear tuning curves of the magnet’s acceleration are measured by driving the coil with a swept sinusoidal signal applied to a constant current amplifier. In two-tone tests, air-borne sound from 3 inch diameter speakers drive the bead column surface at closely spaced frequencies near the fundamental resonance. Nonlinearly generated combination frequency tones are compared for each of the bead diameter experiments.A soil plate oscillator (SPO) apparatus consists of two circular flanges sandwiching and clamping a thin circular elastic plate. The apparatus can model the acoustic landmine detection problem. Uniform spherical glass beads – representing a nonlinear mesoscopic elastic material – are supported at the bottom by the acrylic plate (4.5 inch diam, 1/8 inch thick) and stiff cylindrical sidewalls of the upper flange. A magnetic disk centered and fastened below the plate is driven by an AC coil placed below the magnet. Nonlinear tuning curves of the magnet’s acceleration are measured by driving the coil with a swept sinusoidal signal applied to a constant current amplifier. In two-tone tests, air-borne sound from 3 inch diameter speakers drive the bead column surface at closely spaced frequencies near the fundamental resonance. Nonlinearly generated combination frequency tones are compared for each of the bead diameter experiments.

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