Vibratory shock compound sensor for improving low frequency characteristic
A composite sensor and sensor technology, applied in vibration test, shock test, instrument, etc., to achieve the effect of guaranteeing the frequency range
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Embodiment 1
[0076] Assume that the mass of the sensor base of the sensor is M1=16g, the built-in spring mass generalized resonance resonance system of the sensor and the resonance mass of the resonator assembly M2=3g, the spring stiffness of the elastic element K2=4.75×107N / m, and the set resonance damping n2=38Ns / m, the mass of the shell, cable clamp and cable installed on the sensor base is the mass of the upper cover M3=100g, the stiffness of the sensor shell K3=6×105N / m, and the shell damping n3=3Ns / m. Let the machine mass M0=100kg, the original internal cable rigidity K41=7×105N / m, and the internal cable rigidity improved by flexible PCB K42=14000N / m.
[0077] The desired sensor characteristics are: the resonant frequency f0=20±0.5kHz of the internal resonator components, the resonant gain G0=20±1dB, and the passband gain G1=0±1dB within 5.3kHz.
[0078] Before using the flexible PCB technology of the present invention, as attached Figure 13-1 The electromechanical equivalent simu...
Embodiment 2
[0081] On the basis of Example 1, the influence of the classic stud bolt connection and the connection with the tapered bolt of the present invention on the resonance system of the sensor is further tested.
[0082] The sensor base is coupled to a 100kg machine connection via classic nominal M5 studs. The connection stiffness of the classic stud bolts is set to 5×108N / mN / m, which is about 10 times the stiffness of the resonator component of the sensor. The equivalent simulation is shown in the attached Figure 15-1 . The transfer characteristics of the sensor are as attached Figure 15-2 And attached Figure 15-3 : The resonant frequency f0=20.18kHz of the resonator assembly is qualified; but the resonant gain G0=8.483dB is unqualified; the gain exceeds 1dB at 2.8kHz, and there is also elasticity formed by the sensor base mass M1 and the nominal value M5 bolts The resonance peak of 9268Hz and 39.49dB produced by the quality system is unqualified.
[0083] The sensor base o...
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