Reliable, high-frequency miniature valves for smart material electrohydraulic actuators

Larson, John P.; Dapino, Marcelo J.

doi:10.1177/1045389x12438628

Cited by 21 publications

(15 citation statements)

References 17 publications

(26 reference statements)

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“…17 The third peak measured at 950 Hz is due to dynamics of the inlet (low-pressure) side of the system and does not appear in tests with the valves installed.…”

Section: No-reed Blocked Testingmentioning

confidence: 98%

“…[13][14][15][16] Recent work by the authors demonstrated that the miniature valve approach can successfully rectify flow; however, the overall actuator bandwidth remains limited by the pump manifold design. 17 We investigate the effect of the fluid passages in the pumping manifold on the overall bandwidth of the actuator. A model for the fluid passages in the pump is developed and validated against experimental data.…”

Section: Introductionmentioning

confidence: 99%

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Design of a smart material electro-hydraulic actuator with improved frequency bandwidth

Larson

Dapino

2012

Industrial and Commercial Applications of Smart Structures Technologies 2012

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Smart material electro-hydraulic actuators utilize fluid rectification by one-way valves to convert the small, high-frequency, high-force motions of smart materials such as piezoelectrics and magnetostrictives into useful motions of a hydraulic cylinder. These actuators have potential to replace centralized hydraulic pumps and lines with lightweight, compact, power-by-wire systems. This paper presents the design and testing of an improved actuator system. To increase the frequency bandwidth of operation, a lumped-parameter model is developed and validated based on experimental study of a pump with a performance capacity of 18.4 W. The critical parameters for pump performance are identified and their effect on pump performance assessed. The geometry of the hydraulic manifold that integrates the smart material pump and the output hydraulic cylinder is found to be critical for determining the effective system bandwidth.

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“…17 The third peak measured at 950 Hz is due to dynamics of the inlet (low-pressure) side of the system and does not appear in tests with the valves installed.…”

Section: No-reed Blocked Testingmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Design of a smart material electro-hydraulic actuator with improved frequency bandwidth

Larson

Dapino

2012

Industrial and Commercial Applications of Smart Structures Technologies 2012

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“…These single reed-type valves enabled increased performance up to several hundred hertz. In order to expand the performance into the kilohertz range, miniature check valves have been developed [12][13][14][15]. Smaller valves are designed with less mass to increase the frequency response, with multiple valves arranged in an array to decrease flow resistance losses.…”

Section: Smasis2012-8253mentioning

confidence: 99%

“…Smaller valves are designed with less mass to increase the frequency response, with multiple valves arranged in an array to decrease flow resistance losses. While miniature reeds have been shown to successfully rectify fluid flow, their impact on the overall performance of the system was limited due to the limited bandwidth of the fluid system, which includes the pumping chamber, output cylinder, and connecting passages [15].…”

Section: Smasis2012-8253mentioning

confidence: 99%

Performance Modeling of a Smart Material Hydraulic Actuator

Larson

Dapino

2012

Volume 2: Mechanics and Behavior of Active Materials; Integrated System Design and Implementation; Bio-Inspired Materials and S

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Smart Material Hydraulic Actuators (SMEHAs) allow high-energy-density materials, such as piezoelectrics and magnetostrictives, to be used to develop compact, high-power actuators. Hydraulic rectification using check valves converts the high-frequency, small-displacement motion of a smart material to large displacements of a hydraulic actuator. In this paper, the performance of a magnetostrictive actuator is evaluated over a range of input frequencies and loading conditions and compared to model results of the overall system. The system’s dynamic performance is found to depend highly on the response of both the check valves used to rectify the motion of the smart material driver and the fluid system, including the passages connecting the smart material pump to the output hydraulic cylinder. Using AMESim, a model is developed for the response of the system and compared to experimental results.

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“…When the pump discharges liquid, the hysteresis of opening the outlet valve reduces the amount of liquid discharged from the pump chamber, and the hysteresis of closing the inlet valve makes the liquid in the pump chamber return to the inlet pipe again. Researchers have been committed to designing valves with high-frequency response to solve this problem [ 12 , 13 , 14 , 15 , 16 ]. The existing research in this field has become mature, and the response frequency of some high-frequency valves reachs over 1 kHz.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical and Experimental Study of a Piezoelectric Pump with Two Elastic Chambers

Zhao

Guo

2020

Sensors

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The paper is a continuation of our work on the dynamic load in piezoelectric pumps. In the study, the dynamic load of liquid in the pipelines was proposed as a key factor that limits the output performance of piezoelectric pumps. To decrease the dynamic load, a piezoelectric pump with two elastic chambers was proposed in our previous published work. In this paper, the performance and key parameters of the piezoelectric pump with two elastic chambers were studied through theoretical analyses and experimental tests. After establishing the mathematical model of the piezoelectric pump with two elastic chambers, the paper theoretically analyzed the performance of the pump and the effect of different structural parameters on the performance. Then prototypes with a range of structural parameters were developed and tested. As revealed from the test results, the elastic chamber effectively decreased the dynamic load of the liquid in the pipelines and the flow rate of the prototype with two elastic chambers was higher than that of the prototype with one or no elastic chamber. However, the elastic chamber did not lead to the increase in the maximum output backpressure of the prototype. Adopting an elastic diaphragm exhibiting a smaller stiffness or a larger diameter could help decrease the dynamic load of the liquid. The elastic chamber more significantly impacted the flow rate of the piezoelectric pump with long pipelines. The pump chamber height had a significant effect on the output performance of the piezoelectric pump with two elastic chambers, which is consistent with the conventional piezoelectric pump. At the height of 0.2 mm, the flow rate of the prototype with two elastic chambers was peaked at 7.7 mL/min; at the height of 0.05 mm, the output backpressure reached the highest of 28.2 kPa. The dynamic load could decrease the amplitude of the piezoelectric vibrator, whereas the prototype with two elastic chambers could effectively reduce the impact of dynamic load on the piezoelectric vibrator. The flow rate decreased almost linearly with the backpressure. Under the same backpressure, the flow rate of the prototype with two elastic chambers was higher than that of the prototype without elastic chamber, and the flow rate difference between the two prototypes gradually decreased with the backpressure.

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Reliable, high-frequency miniature valves for smart material electrohydraulic actuators

Cited by 21 publications

References 17 publications

Design of a smart material electro-hydraulic actuator with improved frequency bandwidth

Design of a smart material electro-hydraulic actuator with improved frequency bandwidth

Performance Modeling of a Smart Material Hydraulic Actuator

A Theoretical and Experimental Study of a Piezoelectric Pump with Two Elastic Chambers

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