Ultrasonic linear piezomotors have several advantages compared to electromagnetic motors in specific applications such as in high-vacuum conditions and where no magnetic field is allowed. These compact directdrive motors are fast, but low speeds and high-resolution positioning are difficult to obtain. On the other hand, several non-resonant piezosteppers were developed, resulting in very accura...

We present measurements of the acoustic vibrations of single gold nanorods deposited on a glass substrate immersed in air and water by ultrafast pump-probe spectroscopy. The nanorods display two vibration modes, the breathing mode and the extensional mode. The damping time of the two modes is influenced by the environment, and a reduction of the quality factor is observed when the particles are...

Intelligent techniques are versatile in signal classification and estimation. Prominent techniques like fuzzy logic, artificial neural networks, genetic algorithms plays a significant role in signal classification and are helpful in developing various continuous control schemes. This chapter presents the effectiveness of fuzzy logic concept in classifying the vibration signals based on their fr...

Recently the Time Delay Control with Switching Action (TDCSA) method has been proposed as a promising technique in the robust control area, where the plant has unknown dynamics with parameter variations and substantial disturbances are present. When TDCSA is applied to nonlinear system having frequency resonances, TDCSA reveals chattering problem or undesired vibration. This undesired vibration...

To effectively control the horizontal vibration of high-speed elevator car system caused by factors such as irregularity guide rail and nonlinearity spring-damping in shoes, this paper proposes an active disturbance rejection (ADR) method based on fuzzy sliding mode. Firstly, considering nonlinear characteristics dynamic model is established. Then, excitation linear disturbances are summarized ...

background many industrial devices have an excessive vibration which can affect human body systems. the effect of vibration on cochlear histology has been as a debatable problem in occupational health and medicine. objectives due to limitation present in human studies, the research was conducted to survey the influence of vibration on cochlear histology in an animal model. materials and methods...

OBJECTIVES/HYPOTHESIS This study used air-conducted sound (ACS) and bone-conducted vibration (BCV) stimuli in eliciting ocular vestibular-evoked myogenic potential (oVEMP) and cervical VEMP (cVEMP) in guinea pigs. STUDY DESIGN Prospective study. METHODS Ten guinea pigs were treated with gentamicin (4 mg) on the left ear, whereas the right ear served as a control. One week after treatment, e...

A novel design of force to rebalance control for a hemispherical resonator gyro (HRG) based on FPGA is demonstrated in this paper. The proposed design takes advantage of the automatic gain control loop and phase lock loop configuration in the drive mode while making full use of the quadrature control loop and rebalance control loop in controlling the oscillating dynamics in the sense mode. Firs...

Several types of microfabricated mechanical filters are analyzed for RF communications applications and their advantages over the traditional SAW or FBAR filters are described. GHz frequency operation requires sub-micron dimensions. This work focuses on the modeling of a filter with torsional mode vibration. Ansys finite element simulation has been performed to make comparison with the analytic...

This paper investigates the lateral vibration of single-layered graphene sheets based on a new theory called doublet mechanics with a length scale parameter. After a brief reviewing of doublet mechanics fundamentals, a sixth order partial differential equation that governs the lateral vibration of single-layered graphene sheets is derived. Using doublet mechanics, the relation between natural f...