Acoustic waves at microwave frequencies are widely used in wireless communication and potential information carriers quantum applications. However, most acoustic devices passive components, the development of phononic integrated circuits is limited by inability to control a low-loss, scalable manner. Here we report electrical gigahertz travelling room temperature millikelvin temperatures. We ac...

The scale parameters of bubbles produced by underwater exhaust influence the effect acoustic insulation. According to dynamic characteristics in process and design criteria equal flow per unit area, two-dimensional equation was established. analytical expressions orifice position geometric device were obtained. finite element models established compare two vent patterns uniform distribution fix...

A design optimization procedure of a noise-vibrationharshness (NVH) problem of a complicated vehicle structure is presented by assuming the acoustic pressure does not affect the structural vibration. The steady-state dynamic behavior of the vehicle is calculated from the frequency response finite element analysis, while the sound pressure level within the acoustic cavity is calculated from the ...

This paper presents a new control structure to reduce torque ripple in switched reluctance motor. Although SRM possesses many advantages in motor structure, it suers from large torque ripple that causes some problems such as vibration and acoustic noise. In this paper another control loop is added and torque ripple is de ned as an objective function. By using fuzzy sliding mode strategy, the DC...

acoustic neuromas (an) are schwann cell-derived tumors that commonly arise from the vestibular portion of the eighth cranial nerve also known as vestibular schwannoma(vs) causes unilateral hearing loss, tinnitus, vertigo and unsteadiness. in many cases, the tumor size may remain unchanged for many years following diagnosis, which is typically made by mri. in the majority of cases the tumor is s...

The primary source of aircraft noise is the fan noise from the engines; natural approaches to reducing this noise involve acoustic shape optimization of the inlet and impedance optimization of the liner. This project will use optimal control to systematically determine the inlet shape and the linear material impedance factor that minimize the fan noise. A novel feature of this approach is that ...