An experimental study on the displacement amplification mechanism driven by piezoelectric actuators for jet dispenser

Ham, Young-Bog; An, Byeung-Cheol; Trimzi, Mojiz Abbas; Lee, Gi-Tae; Park, Jung Ho; Yun, So-Nam

doi:10.1109/marss.2016.7561742

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…One of the reasons behind the reduction in amplified displacement can be misalignment of the needle or piezostack. However, the tappet displacement of more than 420 μm is well suited for multiple dispensing applications [20,21,49]. The feed from the laser sensor represents the needle displacement of jet dispenser as shown in Figure 8.…”

Section: Laser Displacement Sensing Experimentsmentioning

confidence: 99%

Development of a Piezo-Driven Liquid Jet Dispenser with Hinge-Lever Amplification Mechanism

Trimzi

Ham

et al. 2020

Micromachines

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Owing to the quick response, compact structure, high precision, huge blocking force generation, and ease of operation, piezoelectric actuators are urgently being adopted in the field of advanced dispensing for jetting performance improvement and fulfillment of precision requirements in microelectronics packaging, adhesive bonding, and miniaturization industry. This research focuses on the fundamental design and development of a piezo-electrically driven compact fluid dispenser using the principle of a class-one lever for amplification of needle displacement, and enhancement of application areas of the developed jet dispenser. Using fundamental lever principle, geometry-based modelling is carried out to fabricate a working prototype of a normally closed hinge-lever type dispenser. Preliminary experiments are carried out to witness the workability of the fabricated dispenser to deliver 100 dots of working fluid per second that will provide a novel device for dispensing of various fluids, and the proposed amplification mechanism suits various other piezoelectric applications as well.

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Section: Laser Displacement Sensing Experimentsmentioning

confidence: 99%

Development of a Piezo-Driven Liquid Jet Dispenser with Hinge-Lever Amplification Mechanism

Trimzi

Ham

et al. 2020

Micromachines

Self Cite

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“…Depending on the element distribution (masses, springs, damps, and friction forces) in the mechanism, the dynamic behavior of the system varies. A variable dynamic behavior affects the amplified PEA devices, with greater influence when larger loads are applied and time lag increases pursuant to increasing frequency [11]. Additionally, in complex devices the performance is limited by friction, which causes positioning errors [12].…”

Section: Introductionmentioning

confidence: 99%

Sliding Mode Control with Dynamical Correction for Time-Delay Piezoelectric Actuator Systems

et al. 2019

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In piezoelectric actuators (PEAs), which suffer from inherent nonlinearities, sliding mode control (SMC) has proven to be a successful control strategy. Nonetheless, in micropositioning systems with time delay, integral proportional control (PI), and SMC, feedback control schemes have a tendency to overcompensate and, consequently, high controller gains must be rejected. This may produce a slow and inaccurate response. This paper presents a novel control strategy that deals with time-delay micropositioning systems aimed at achieving precise positioning by combining an open-loop control with a modified SMC scheme. The proposed SMC with dynamical correction (SMC-WDC) uses the dynamical system model to adapt the SMC inputs and avoid undesirable control response caused by delays. In order to develop the SMC-WDC scheme, an exhaustive analysis on the micropositioning system was first performed. Then, a mixed control strategy, combining inverse open-loop control and SMC-WDC, was developed. The performance of the presented control scheme was analyzed and compared experimentally with other control strategies (i.e., PI and SMC with saturation and hyperbolic functions) using different reference signals. It was found that the SMC-WDC strategy presents the best performance, that is, the fastest response and highest accuracy, especially against sudden changes of reference setpoints (frequencies >10 Hz). Additionally, if the setpoint reference frequencies are higher than 10 Hz, high integral gains are counterproductive (since the control response increases the delay), although if frequencies are below 1 Hz the integral control delay does not affect the system’s accuracy. The SMC-WDC proved to be an effective strategy for micropositioning systems, dealing with time delay and other uncertainties to achieve the setpoint command fast and precisely without chattering.

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Optimal Design of Jetting Configuration for Robust Performance

Shan

2018

IEEE Trans. Compon., Packag. Manufact. Technol.

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An experimental study on the displacement amplification mechanism driven by piezoelectric actuators for jet dispenser

Cited by 3 publications

References 24 publications

Development of a Piezo-Driven Liquid Jet Dispenser with Hinge-Lever Amplification Mechanism

Development of a Piezo-Driven Liquid Jet Dispenser with Hinge-Lever Amplification Mechanism

Sliding Mode Control with Dynamical Correction for Time-Delay Piezoelectric Actuator Systems

Optimal Design of Jetting Configuration for Robust Performance

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