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This work presents a model of a transducer array suitable for particle transportation. The transducer array is excited by sine function in voltage. The distributions of horizontal acoustic radiation forces are simulated using ANSYS and MATLAB-base program. The underlying motion equation is described in this paper. According to this equation, the motion trajectory of a levitated particle is calculated...
We propose an indirect stiffness estimation method of flexible joint based on system function approximation in this paper. At first, an alternative system function is constructed. Then a system function estimation method based on saturation function is introduced to estimate its output. Taking the estimated system function as prior model, the least square method is finally introduced to identify the...
This paper presents the design and modeling of a novel torsion spring-based actuator (TSA) with variable stiffness. The mechanical structure of stiffness regulation contains two opposite-handed torsion springs and two cam bearing followers (CFs). The operational principle is by changing the contact point of the torsion spring and the CF to regulate the stiffness. The proposed design allows for the...
This paper performs a theoretical and experimental analysis of the pressure sensitivity of Brillouin frequency shift (PSoBFS) in silica optical fibers with double-layer polymer coatings. It is predicted numerically that the coated fibers have enhanced (ideally over 20 times) PSoBFS as compared with a bare fiber. In addition, the enhancement becomes obvious while the outer coating has a lower Young's...
This paper demonstrates theoretically and experimentally the effects of polymer coatings on temperature sensitivity of Brillouin frequency shift (TSoBFS) within double-coated silica optical fibers. A theoretical analysis of TSoBFS has been made by considering geometrical, thermal, and mechanical properties of the outer polymer coating. It is shown that TSoBFS increases with Young's modulus, thickness,...
The paper presents a novel measurement method for a piezoelectric transducer mechanical resonant frequency. A transducer natural frequency is obtained through analyzing residual vibration signals spectrum based on the Morlet wavelet transform, and subsequently the transducer mechanical resonant frequency is calculated against the relationship of the natural frequency and the mechanical resonant frequency,...
To make out a reasonable reference to the choice of sensor in the field of optical fiber temperature sensing, these temperature measurement experiments were carried out, including fiber Bragg grating, optical fiber Brillouin scattering, Raman Scattering Fiber Optic sensors, which are all packaged with FRP suitable for engineering applications. Then temperature measurement results are obtained. Meanwhile,...
A new kind of FBG displacement sensor is developed which can be temperature self-compensation. Experiments were carried out to validate characters of the sensor which has good linearity and repetition.The displacement resolution is 0.01mm, and the correlation coefficient is within 0.9999. The sensor is fit for the optical sensing system.
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