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Micromanipulation provides researchers a new way to fabricate complex structures through assembling small components, and it is also a useful tool for single cell manipulation. Many micromanipulation methods have been proposed, but only the few are capable of rotation of the micro targets. In this paper, we present a simple non-contact high-speed rotation method based on the local flow generated by...
In this article the vibration suppression of a beam under heavy fluid loading will be addressed. The main novelty of this study is suppressing the beam vibrations in contact to the fluid utilizing piezoelectric sensors and actuators. The piezoelectric sensors and actuators are attached to the beam and utilized to suppress the beam vibrations. In this study, the fluid has a free surface which complicate...
Jet dispenser driven by piezoelectric actuators, based on diamond-shape shell structure without any hinges, was designed and their static and dynamic characters were investigated. The amplifier makes the dispenser small and compact, and operated in a wide range of frequency. In this study, a method to accumulate the amplifyer displacement will present firstly. In the following, dynamic model of a...
Jet dispenser driven by piezoelectric actuators, based on diamond-shape shell structure without any hinges, was designed and their static and dynamic characters were investigated. The amplifier makes the dispenser small and compact, and operated in a wide range of frequency. In this study, a method to accumulate the amplifyer displacement will present firstly. In the following, dynamic model of a...
In this paper, MEMS based polymeric drug delivery system for the treatment of cardiovascular disorder such as hypertension is presented. The major components of proposed system are drug delivery device, blood pressure sensor, flow sensor, electronic module, and power supply. Drug delivery device consists of piezoelectric actuator and reservoir integrated with side open polymeric microneedles. The...
A new piezoelectric/ electrorheological hybrid hydraulic ultra-precision step actuator that uses a hybrid mode of piezoelectric stack pump hydro-drive and electrorheological valve control to the precision hydraulic cylinder is presented. It achieves high frequency, ultra-precision hydraulic step drive. The working principle of the step actuator is analyzed and its experimental characteristics are...
This paper presents a piezoelectric stack pump for precise actuator. The piezoelectric pump is characterized by long travel range, precise flow, large driving force, etc. The actuator is controlled by PC and Data Acquisition and Control System (DACS). Simulations and experiments showed that the piezoelectric pump has high efficiency and good performance. With a voltage of 100 V, the flow rate is linear...
In this paper a piezoelectrically actuated microsensor for simultaneous measurement of fluids viscosity and density is presented. The sensor consist of a beam with two piezoelectric layers, which are located on the upper and lower surfaces of it and a sensing plate at the end of it which is immersed in a fluid. In the developed model, the governing coupled partial differential equations of longitudinal...
Research has been undertaken to explore the possibility of using smart materials for the actuation of screw-in cartridge valves. Four types were considered and a piezoelectric (PZT) stack was selected as the most appropriate actuator. The concept of a spool valve piloted by a PZT valve was chosen for investigation. A mathematical model of a hydraulic system with a spool valve piloted by a PZT valve...
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...
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