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Acoustic radiation force has many applications. One of the related technologies is the ability to noninvasively expel stones from the kidney. To optimize the procedure it is important to develop theoretical approaches that can provide rapid calculations of the radiation force depending in stone size and elastic properties, together with ultrasound beam diameter, intensity, and frequency. We hypothesize...
Miniaturized actuators are a key element for the manipulation and automation at small scales. Here, we propose a new miniaturized actuator, which consists of an array of micro gas bubbles immersed in a fluid. Under ultrasonic excitation, the oscillation of micro gas bubbles results in acoustic streaming and provides a propulsive force that drives the actuator. The actuator was fabricated by lithography...
Wireless power transfer (WPT) and electromechanical power conversion are traditionally accomplished with magnetic (inductive) techniques for a wide range of applications. Electrostatic (capacitive) approaches to WPT for electric machinery have had limited success over the history of power conversion due to the low power density, low mechanical robustness and cost that could not compete with magnetic...
Ultrasonic particle manipulation tools have many promising applications in life sciences research, expanding on the capabilities of current manipulation technologies. In this paper the feasibility of ultrasonic manipulation of particles and cells along a microfluidic channel with an array is investigated. An array integrated into a multilayer resonator structure drives particles towards the pressure...
In recent years, the research and development of piezoelectric pumps have become an increasingly popular topic. Minimization, structure simplification and stronger output became the focus of piezoelectric pumps research due to its possible application in MEMS technology. The valveless fishtailing piezoelectric pump with rectangular vibrator, neither a volumetric nor a rotating pump, was invented according...
The characteristics of microcantilevers vibrating in the in-plane flexural mode (also known as lateral vibration) in viscous liquid media are investigated. A numerical model was utilized to determine a correction to Stokes' solution for an infinite plate to obtain an analytical expression for the hydrodynamic forces acting on a laterally vibrating microcantilever as a function of both Reynolds number...
Coriolis mass flowmeter(CMF) is significant in many industrial and commercial areas. The Coriolis mass flow sensor is one of the CMF components, which is essential to the performance and precise. The objectives of the work to be presented here were to investigate the vibration characteristics of Coriolis mass flow sensor by experiment, using commercial meters (U-shape tubes). By applying an external...
In this paper a structure model of Micro Electro Mechanical System (MEMS) ultrasonic separator which is based on the two-dimensional normal vibration modes is presented and the resonance frequencies of the two-dimensional normal vibration modes and lateral standing wave are explored. First, in accordance with the theory of electricity-sound analogy, a two-dimensional equivalent network of the ultrasonic...
Nano-electro-mechanical resonators used for sensing, data storage, and nano-fabrication applications are often operated as feed-back control systems. To determine the transfer function of silicon cantilevers with a width of 5.0 mum, a thickness of 800 nm, and lengths of 10, 15, 30, and 45 mum, the damping in air and liquid was simulated numerically using an integrated fluid- structure solver. Bode...
We developed several underwater robots by using macro fiber composite(MFC), a new type of piezo-electric actuator with the merits of being soft and capable of large displacement, developed by NASA recently. MFC is made by processing PZT into a fiber-like state, hence yielding better flexibility, and structural actuation is possible by pasting it to thin structures since it is covered by polyimide...
In this paper, a first prototype of a multifunctional tactile sensor using ionic polymer metal composites (IPMCs) is proposed, designed, and tested. Two IPMC strips are used, one as an actuator and one as a sensor, both positioned in a cantilever configuration; working together they enable the system to detect the presence of a material in contact with it and to measure its stiffness. These sensing...
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