A nonlinear resonant mass sensor with enhanced sensitivity and resolution incorporating compressed bistable beam
A nonlinear resonant mass sensor with enhanced sensitivity and resolution incorporating compressed bistable beam
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DOI：
10.1063/1.5050179
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发表时间：
2018-10
影响因子：
3.2
通讯作者：
Jian Zhao;Chen Sun;N. Kacem;Hongxi Wang;Renjing Gao;Pengbo Liu;Yu Huang
中科院分区：
文献类型：
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作者：
Jian Zhao;Chen Sun;N. Kacem;Hongxi Wang;Renjing Gao;Pengbo Liu;Yu Huang
提出了一种新型压电驱动非线性质量传感器，它利用受压双稳态梁的突跳现象来提高灵敏度和分辨率，可通过跟踪分岔频率偏移来称重或检测阈值质量。根据非线性有限元建模技术，对组合非线性结构的非线性动态响应进行了数值计算，结果表明，无论阻尼效应如何，都可通过急剧且大幅的振幅变化准确识别分岔点，从而为跟踪分岔频率提供了一种有效方法。因此，单位质量分岔频率偏移所描述的非线性灵敏度可达到相同尺寸线性质量传感器灵敏度的3.3倍。此外，作为质量开关，当添加质量大于或等于阈值（该阈值取决于激励频率）时，响应振幅会急剧跳跃。同时，为了优化传感器，还获得了梁压缩量和激励电压对灵敏度和最小可检测质量的影响。为了验证概念，制作了一个宏观尺寸的非线性质量传感器，其几何尺寸为长58.0毫米、宽4.0毫米，实验结果表明，其灵敏度约为575.0赫兹/克，而模拟灵敏度为542.0赫兹/克。对于质量开关，最小阈值质量为0.2毫克。模拟与实验之间的良好一致性充分验证了所提出的非线性双稳态质量传感器。
A new piezoelectric actuated nonlinear mass sensor is proposed by using the snap-through phenomenon of a compressed bistable beam to enhance the sensitivity and resolution, which can be used to weigh or detect threshold mass by tracking the bifurcation frequency shift. According to the nonlinear finite element modeling technique, the nonlinear dynamic response of the combined nonlinear structure is numerically calculated, which shows that the bifurcation point can be accurately identified by the sharp and great amplitude change regardless of the damping effect, thus providing an effective way for tracking the bifurcation frequency. Hence, the nonlinear sensitivity depicted by the bifurcation frequency shift per unit mass can reach 3.3 times the sensitivity of linear mass sensors having the same size. Also, as a mass switch, the response amplitude jumps sharply when the added mass is greater than or equal to the threshold value, which is dependent on the excitation frequency. Meanwhile, the influences of the beam compression and excitation voltage on the sensitivity and minimum detectable mass were obtained for sensor optimization. For concept validation, a macro-sized nonlinear mass sensor was fabricated with the geometric size of 58.0 mm long and 4.0 mm wide, and the experimental results show that the sensitivity is around 575.0 Hz/g compared with the simulated sensitivity of 542.0 Hz/g. For a mass switch, the minimum threshold mass is 0.2 mg. The fair agreement between the simulation and experiments adequately validated the proposed nonlinear bistable mass sensor.