Investigation of the Dynamic Characteristics of a Piezohydraulic Actuator

Sirohi, Jayant; Cadou, Christopher P.; Chopra, Inderjit

doi:10.1177/1045389x05051072

Cited by 35 publications

(28 citation statements)

References 22 publications

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“…Thus, their frequency characteristics are more complex due to resonances associated with the hydraulic cylinder volume and the piping connections which may cause pressure reflections. Some researchers have successfully modeled these fluid line dynamics using fluid transmission line models to predict frequency response of the entire system [24].…”

Section: Discussionmentioning

confidence: 99%

Development of a low-voltage piezohydraulic pump for compact hydraulic systems

Valdovinos

Carman

2015

Smart Mater. Struct.

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Frequency-leveraged electrohydraulic and piezohydraulic pumps represent an alternative technology to traditional electromagnetic motors. The development of a 45 cm 3 piezohydraulic pump utilizing a 2 g low-voltage piezoelectric stack is presented. The piezohydraulic pump flow rate and performance were measured and compared to existing pumps in the literature. The flow rate produced by piezohydraulic pump was a non-linear function of pump operational frequency showing multiple peaks. These flow rate peaks were a function of accumulator size and hydraulic line resonance. The piezohydraulic pump was capable of producing a 125 kPa stall pressure, 186 mL/min no-load flow rate, and 0.14 W of power. This pump constitutes one of the two miniature piezohydraulic pumps capable of outputting useful mechanical work. In addition, these results demonstrate that the external hydraulic lines and hydraulic accumulators have a significant effect on the flow and power output of this technology.

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Section: Discussionmentioning

confidence: 99%

Development of a low-voltage piezohydraulic pump for compact hydraulic systems

Valdovinos

Carman

2015

Smart Mater. Struct.

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“…A no-load velocity of 30.5 mm/s was achieved, and the blocked force was 155.7 N at a pumping frequency of 300 Hz. In addition, many researchers (Chaudhuri et al, 2009; Cadou and Zhang, 2003; Ellison, 2005; John et al, 2008; Sirohi et al, 2005; Tan et al, 2005) have developed actuators using smart materials.…”

Section: Introductionmentioning

confidence: 99%

High actuation force of piezoelectric hybrid actuator with multiple piezoelectric pump design

Yong-zhe

Goo

et al. 2017

Journal of Intelligent Material Systems and Structures

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The piezoelectric hybrid actuator is a new electro-hydrostatic actuator with broad prospects for development. Compared with the traditional hydraulic pump, the piezoelectric hybrid actuator is characterized by a simple structure, small size, lightweight, and low power. However, it has a well-known weakness: It produces only a small actuation force and then cannot be used in real applications. Because the maximum force produced by a one-piezoelectric pump design cannot be increased much due to limitations in the power supply and piezoelectric materials, researchers have moved to the use of multiple piezoelectric pumps. In this research, a double-piezoelectric pump-hydraulic cylinder hybrid actuator was designed, manufactured, and tested in order to increase the actuation force. Key design factors such as the connection method and driving method were investigated to realize the double-piezoelectric pump design and achieve a high level of performance. A total of three kinds of double-piezoelectric pump-hydraulic cylinder hybrid actuator designs were selected by a theoretical approach and implemented using two identical piezoelectric pumps. A manual valve system was installed for switching the connection method (series and parallel modes). The driving method, phase, or voltage was controlled by a LabVIEW program. The maximum blocking force of 4615 N was measured at 250 Hz for cross driving, series connection and φ30-mm cylinder. The maximum velocity of 68.3 mm/s was measured at 300 Hz for cross driving, series connection and φ21-mm cylinder. Fluid structural interaction analysis using ANSYS software confirmed the experimental results. The performance of double-piezoelectric pump-hydraulic hybrid actuator meets the minimum requirements for mechanical and aerospace actuator applications.

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“…With liquid medium converting and delivering power, several kinds of cylinder systems driven by piezostack pump are under development based on the frequency rectification principle (Nasser and Leo, 2000). The developed hydraulic cylinder system are called piezohydraulic actuators (Cadou and Zhang, 2003;Lindler and Anderson, 2003;Sirohi and Chopra, 2003;Sirohi et al, 2005;John et al, 2009), piezohydraulic motors (Kan et al, 2008a;Tang et al, 2009), or piezohydraulic pumps directly Lynch, 1999, 2000;Oates and Lynch, 2001). In this article, they are called entirely piezohydraulic actuators.…”

Section: Introductionmentioning

confidence: 99%

Development of piezohydraulic actuator driven by piezomembrane pump

Kan

Wang

Zhang

et al. 2011

Journal of Intelligent Material Systems and Structures

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A piezohydraulic actuator (piezopump-driven cylinder system) has the advantage over the conventional contact/non-contact piezoelectric motors in terms of achieving large thrust, high velocity, and long traveling distance. In this study, a serial-connection 5-chamber piezomembrane pump (SCCPP) was introduced and used for replacing piezostack pumps so as to decrease cost of piezohydraulic actuators. The border-upon piezomembranes work in anti-phase, a SCCPP is equivalent to several single-chamber pumps running in series. The theoretical study suggests that the performance of a SCCPP-driven actuator depends mainly on the efficiency of check valves, structural parameters of piezomembrane/pump chamber/cylinder, the number of pump chambers, and liquid bulk modulus. A piezomembrane has an optimal thickness ratio (metal to piezoelectric) for the actuator to achieve maximal power. A SCCPP-driven actuator was fabricated and tested under three/four/five chambers running. The testing results show that the thrust, velocity, power, and even optimal frequency of the piezohydraulic actuator all increase linearly with number of working chambers and driving voltage. At 180 V and 280 Hz, the achieved thrust, velocity, power, and step length from the actuator under five piezomembranes running are 75 N, 9.8 mm/s, 184.5 mW, and 35.2 µm, respectively, which are about 2.1/2.7/5.7/2.7 times than those of three piezomembranes running.

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Investigation of the Dynamic Characteristics of a Piezohydraulic Actuator

Cited by 35 publications

References 22 publications

Development of a low-voltage piezohydraulic pump for compact hydraulic systems

Development of a low-voltage piezohydraulic pump for compact hydraulic systems

High actuation force of piezoelectric hybrid actuator with multiple piezoelectric pump design

Development of piezohydraulic actuator driven by piezomembrane pump

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