&lt;title&gt;System dynamic modeling of a piezoelectric hydraulic pump&lt;/title&gt;

Oates, William S.; Mauck, Lisa D.; Lynch, Christopher S.

doi:10.1117/12.475210

Cited by 10 publications

(7 citation statements)

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“…A variety of models for this coupling have been developed based on quasi-static approaches (Mauck et al , 2001Cadou and Zhang, 2003) lumped parameter approaches using electrical (Nasser and Leo, 2000) and mechanical analogies (Oates et al 2002), lossless-line (Sirohi et al 2005) approaches, and integration of the mass conservation equations (Regelbrugge et al 2003). All of these approaches treat the flow in an essentially one dimensional (1D) manner in which the pressure losses through orifices are related to the volume flow rate using a loss coefficient.…”

Section: Introductionmentioning

confidence: 99%

Application of CFD in the Design and Analysis of a Piezoelectric Hydraulic Pump

John¹,

Cadou²,

Yoo

et al. 2006

Journal of Intelligent Material Systems and Structures

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The ability of smart materials to deliver large block forces in a small package while operating at high frequencies makes them extremely attractive for converting electrical power into mechanical power. This has led to the development of hybrid actuators consisting of co-located smart material actuated pumps and hydraulic cylinders. The overall success of the hybrid concept hinges on the effectiveness of the coupling between the smart material and the fluid. This study presents the results of two and three-dimensional (3D) simulations of fluid flow in a prototype hybrid actuator being developed for aerospace applications. The steady simulations show that losses in the device result primarily from three-dimensional effects like radial acceleration of the fluid in the pumping chamber, and the formation of vortex ring structures that block the flow. The effects of varying design parameters like pumping chamber height, discharge tube location, and discharge tube chamfer are explored and are found to have significant impacts on performance. Analytical expressions for the scaling of pressure losses with driving frequency are presented.

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Section: Introductionmentioning

confidence: 99%

Application of CFD in the Design and Analysis of a Piezoelectric Hydraulic Pump

John¹,

Cadou²,

Yoo

et al. 2006

Journal of Intelligent Material Systems and Structures

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“…Compared with the piezomembrane pumps, the piezostack pumps can achieve high backpressure, and are suitable for high-power applications, such as linear piezohydraulic actuators for structural control. However, present investigations focus mainly on the overall performance of the system consisting of a piezostack pump and cylinder [3,4]. Research on the piezostack pumps in terms of design method as well as energy efficiency has not been widely explored to the author's best knowledge.…”

Section: Introductionmentioning

confidence: 98%

“…Because of their precisely controlled flowrate, piezoelectric pumps present promising applications in analytical chemistry, medical treatment, pharmacy, bioengineering, fuel-drop generator for automobile heaters, and structural control applications [1][2][3][4][5]. Since one of the early piezoelectric pumps for insulin delivery was fabricated [6], more efforts have been made in the research of piezoelectric pumps.…”

Section: Introductionmentioning

confidence: 99%

Efficiency characteristics of piezostack pump for linear actuators

Kan

Peng

Tang

et al. 2009

Front. Mech. Eng. China

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A piezostack pump for linear actuators is presented and studied in terms of mechanical energy efficiency (MEE), energy conversion efficiency (ECE) and design method. MEE is defined as the ratio of the output mechanical energy to that converted from input electrical energy, and ECE is the ratio of output mechanical energy to input electrical energy. The analysis results show that both MEE and ECE decrease with the increase of stiffness of the chamber diaphragm (k s ), which is a function of the radius ratio (rigid disk radius to chamber radius). There is respective optimal external load (F c ) for them to achieve peak value for a given piezostack with blocked force (F b ) and stiffness (k a ). The optimal force ratio (F c /F b ) is a constant of 0.5 for maximum MEE, and between 0.57 and 0.5 for maximum ECE. Considering the deflection of the pump chamber and dynamic response of the piezostack, the stiffness ratio (k s /k a ) should be limited between 0.3 and 1, and the relative radius ratio is between 0.7 and 0.8. With the increase of the radius ratio in the range, the maximal MEE decreases from 0.38 to 0.25, and the peak ECE decreases from 0.20 to 0.14.

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“…In other words, the area ratio of pump chamber to cylinder piston is a performance effect factor of piezohydraulic system. For a given displacement of piezostack, the piezostack piston pump with a single piston (Nasser and Leo, 2000;Oates et al, 2002) can achieve larger volume deflection than a piezostack membrane pump with a flexible chamber diaphragm (Li et al, 2005) or a combination of piston and flexible membrane (Yoo et al, 2005). But, an accessional accumulator and preloaded liquid are necessary for the piston pump to shrink the piezostack rapidly.…”

Section: Introductionmentioning

confidence: 99%

Study on a Piezohydraulic Motor for Maximal Energy Efficiency

Kan

Wen

Zhang

et al. 2010

Journal of Intelligent Material Systems and Structures

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A piezohydraulic linear motor driven by a piezostack diaphragm pump is presented and studied. The diaphragm of pump chamber consists of a membrane and rigid disk, instead of a single piston or membrane. An analytical model is established to evaluate piezohydraulic motor performance in terms of velocity, pushing force, mechanical energy conversion efficiency (MEE), and electromechanical energy conversion efficiency (EMEE). The involved effect factors of motor performance are radius ratio (rigid-disk radius to chamber radius), area ratio (pump-chamber area to cylinder-piston area), force ratio (external load to blocked force of piezostack), and step ratio (cylinder-piston stroke to free displacement of piezostack). Analytical results show that there are optimal structural parameters (radius ratio and area ratio) for property parameters (force ratio, step ratio, MEE, and EMEE) to obtain maximal values. Considering the achievable peak MEE and EMEE, the design method was introduced for different purpose of applications. A piezohydraulic motor was fabricated and tested to examine the influence of radius ratio on performance of the piezohydraulic motor. The experimental results show that both the motor velocity and driving force can be enhanced with optimizing radius ratio.

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<title>System dynamic modeling of a piezoelectric hydraulic pump</title>

Cited by 10 publications

References 0 publications

Application of CFD in the Design and Analysis of a Piezoelectric Hydraulic Pump

Application of CFD in the Design and Analysis of a Piezoelectric Hydraulic Pump

Efficiency characteristics of piezostack pump for linear actuators

Study on a Piezohydraulic Motor for Maximal Energy Efficiency

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