Subharmonic images are becoming interestingly in medical ultrasound, as the improvement of contrastto-tissue ratio (CTR). However, an important part for image enhancement is processing techniques. In this study, frequency response functions (FRFs) of multiple-input-multiple-output (MIMO) Volterra systems were used to investigate potentially possible in separating subharmonic frequency for the q...

Conventional Kelvin probe force microscopy (KPFM) relies on closed loop (CL) bias feedback for the determination of surface potential (SP). However, SP measured by CL-KPFM has been shown to be strongly influenced by the choice of measurement parameters due to non-electrostatic contributions to the input signal of the bias feedback loop. This often leads to systematic errors of several hundred m...

Eddy current testing is quite a popular non-contact and cost-effective method for nondestructive evaluation of product quality and structural integrity. Excitation frequency is one of the key performance factors for defect characterization. In the literature, there are many interesting papers dealing with wide spectral content and optimal frequency in terms of detection sensitivity. However, re...

Touch screen devices have become ubiquitous in modern day-to-day lives. While smaller touchscreen provide enough user engagement with meaningful haptic feedback, large touch still lack stimulation. Existing literature for surface vibrotactile localization uses many actuators and conventional boundary conditions. Previous numerical studies on do not address multi-frequency excitation. This resea...

This paper presents measurement and analysis of the dynamic response of a five-story building to very-high frequency excitation (> 100 Hz) from blasting vibrations originating from a contiguous excavation of rock. Velocity response measurements, in the rock and on the structure, were employed to calculate time correlated dynamic displacement response of the building to blasting. Time correlated...

In this paper, a universal multi–frequency micro-resistivity array imaging (UMMAI) system for subsurface sensing is developed and verified. Different from conventional equipments, UMMAI capable to provide high-resolution fullbore formation images in multiple logging environments including an oil-based mud scene, water-based scene water-oil mixed owning the large dynamic range good linearity of ...

As a multi-source vibration machine, the complex of combine harvester has caused many effects on various components. In this paper, dynamic response plate and shell is studied, influence factors determined. The structure optimized, scheme structural optimization that replaces finite element model with surrogate developed. designed Latin hypercube design (LHD), surface generated based Kriging mo...

Linear system identification of complex nonlinear systems, such as large space structures, can be difficult because such systems are often lightly damped, have dense modal spacing, respond to disturbances over a large frequency bandwidth, and exhibit nonlinear responses. Many excitation signals used to collect frequency response data for linear system identification are poorly suited to systems...