In this paper a bio-based epoxy with outstanding thermal and mechanical properties was synthesized using rosin-based monomer curing agent.The chemical structures of rosin based agent were confirmed by Nuclear Magnetic Resonance (NMR) Fourier Transform Infrared (FT-IR) spectra.The flexural dynamic as well stability the cured investigated.The results showed that exhibited glass transition temperature (T g ) 164°C its strength modulus high 70 2200 MPa, respectively.This indicated wholly resin...

The acoustic black hole (ABH) phenomenon in thin-walled structures with a tailored power-law-profiled thickness allows for gradual change of the phase velocity flexural waves and energy focalization. However, ideal ABH are difficult to realize suffer from potential structural problems practical applications. It is therefore important explore alternative configurations that can eventually alleviate deficiency structures, while maintaining similar ability wave manipulation. In this study,...

Abstract A previously proposed planar axisymmetric dynamic vibration absorber (DVA), with embedded acoustic black hole (ABH) features, has been shown to suffer from the very selective coupling host structure, thus compromising its reduction performance. To tackle problem, an eccentric ABH-based circular DVA whose thickness profile is tailored according a circumferential gradient variation proposed. This new configuration preserves ABH in radial direction and breaks of original design at same...

In the operational planning of electric power communication networks, a well-structured service scheduling scheme based on established network topology can significantly enhance risk prevention capabilities these networks. Since routing policies directly influence data transmission paths, optimization serves as an effective strategy for improving performance by mitigating risks and threats. This paper introduces Intelligent Tuning Method Service Scheduling in Electric Power Communication...

In this paper, an approach is proposed to broaden the low-frequency bandwidth of sound insulation by regulating dynamic effective parameters acoustic metamaterials (MAMs). First, a flexible membrane-type MAM sample consisting homogenous polyimide membrane and perforated ethylene vinyl acetate copolymer (EVA) plate designed, in which within each hole represented as local resonator without any additional mass. Next, formation mechanisms trough, peak transmission loss (STL) are profoundly...

Acoustic Black Hole (ABH) plate structure has shown promising potentials of vibration suppression above a cut on frequency. For energy dissipation below the frequency, however, ABH is less effective due to absence wave focusing effect. This work reports simultaneous optimization plates for broadband dissipation. Two sets design variables plates, that is, geometry profile and topology damping layer, are optimized in an alternatively nested procedure. A novel objective function, namely upper...

The acoustic black hole (ABH) is a feature commonly found in thin-walled structures that characterized by diminishing thickness and damping layer with an efficient wave energy dissipation effect, which has been extensively studied. additive manufacture of polymer ABH shown promise as low-cost method to ABHs complex geometries, exhibiting even more effective dissipation. However, the used elastic model viscous for both ignores viscoelastic changes occur due variations frequency. To address...

With the rapid development of modern precision manufacturing industry,actuators with high resolution and long stroke are needed in many application fields. Linear piezoelectric motors adopting inertial impact driving mechanism has been interests researchers for simple structure compact size. To increase efficiency this type stepping linear motor, a motor using two stacks was proposed work. Two were placed vertical pre-tightened by an elastic thin plate. Support stator designed. Operation...

A type of drive foot with displacement amplification was proposed based on analysis the friction principle non-resonant linear piezoelectric motors. Firstly, mechanism carried and elliptical trajectory equation tip deduced through model foot. The optimization design main structure parameters conducted finite element software to analyze influences amplification. simulation results showed that maximum magnification factor can be obtained when H(the thickness flexible arm) is 0.8mm θ (the...

Locally resonant phononic crystals (LRPCs) beam is characterized by the band gaps; some frequency ranges within which flexural waves cannot propagate freely. So, LRPCs can be used for noise or vibration isolation. In this paper, a with distributed oscillators proposed, and general formula of gaps transmission spectrum are derived transfer matrix method (TMM) element (SEM). Subsequently, parameter effects on investigated in detail. Finally, rubber concrete designed to demonstrate application...

Abstract Being an important semiconductor material for high power applications, silicon carbide (SiC) faces the problems while used as a gate oxygen layer in traditional Si MOS devices. In view of this, innovative approach was adopted present work to replace conventional SiO 2 with high-k (ZrO ) investigate its effect on electrical characteristics particular ZrO films were deposited and SiC substrates by atomic deposition (ALD), Al electrode. The force microscopy (AFM) microregion scan...

This paper uses embedded Acoustic Black Hole (ABH) on the wallboard for structure lightening and improving performance in broadband vibration reduction. The distribution size of multiple ABHs affect generalized static stiffness (GSS) upper limit structure's maximum kinetic energy (ULMKE) practical applications, which express ability to resist load reduction performance, respectively. In this research, GSS ULMKE are considered optimization objectives due trade-off between them. method based...