A novel duct silencer was developed using dielectric elastomer absorbers (DEAs). Dielectric elastomer, a lightweight,
high elastic energy density and large deformation under high DC/AC voltages smart material, was used to fabricate this
new generation actuator. The acoustic performances of this duct silencer were experimentally investigated in a
transmission loss (TL) measurement system using two-load method. It was found that the resonance peaks of this new
duct silencer could be controlled by applying various DC voltages, a maximum resonance shift of 59.5Hz for the
resonance peaks was achieved which indicated that this duct silencer could be adjusted to absorb broadband range noise
without any addition mechanical part. Furthermore, the resonance shift and multiple resonances mechanisms using DEAs
were proposed and discussed in the present paper which was aiming to achieve broadband noise reduction. The present
results also provide insight into the appropriateness of the absorber for possible use as new acoustic treatment to replace
the traditional acoustic treatment.
A novel approach based on microforce sensing for coarse alignment in active fiber pigtailing is proposed. It is shown that the microforce due to contact between a specially designed force sensor and a geometrical feature on the input surface of an optical device provides useful clues in guiding the fiber to rapidly locate the actual optical path of the optical device. The effectiveness of this approach was demonstrated on a photonic alignment system. These results suggest that microforce sensing can be an effective technique in augmenting conventional approaches for fast and accurate fiber pigtailing in photonic assembly.
We aim to optimize the Hamiltonian algorithm for fiber alignment by simulation and experiments. We develop (1) a three-step optimization method to adjust two relevant parameters in the Hamiltonian algorithm in order to effectively make the alignment process faster and more stable, and (2) two methods to terminate Hamiltonian searching in order to preserve successful alignments under the influence of noise. We demonstrate the effectiveness of all these practical methods through experiments using an alignment system.
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