3 Dimensional
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2021 ◽  
Vol 18 ◽  
pp. 418-429
Toshiki Saotome ◽  
Naoki Shimada ◽  
Kumiko Matsuno ◽  
Koichiro Nakamura ◽  
Yasuhiko Tabata

2021 ◽  
Jonathan P. BENNETT ◽  
Devon CATALDI ◽  
Brandon K. QUON ◽  
Yong En LIU ◽  
Nisa N. KELLY ◽  

Wei Zhu ◽  
Feifei Liu ◽  
Fufeng Yang ◽  
Xiaoting Rui

A controller composed of a feed-forward loop based on a novel dynamic Prandtl–Ishlinskii (P-I) model and a PID feedback control loop is developed to support a 3-dimensional piezo-driven micro-positioning system for high-bandwidth tracking control. By considering the dynamic characteristics of the power amplifier, the dynamic P-I model can accurately describe the rate-dependent hysteresis of piezoelectric stack actuators (PSAs). To ensure that the hysteresis model is independent of system load, the P-I hysteresis operator in that model characterizes the relationship between the output force and the input voltage of PSAs. The dynamics equation of the mechanical is established by using the cutoff modal method. The feedforward control is designed based on the dynamic hysteresis model to reduce the rate-dependent hysteresis. The PID control is incorporated with the feedforward control to increase the tracking accuracy. Experimental results indicate that the controller can overcome the hysteresis efficiently and preserve good positioning accuracy in 1–100 Hz bandwidth. Just by introducing the dynamic characteristics of the power amplifier, which can be expressed as a first-order differential equation, the P-I model can accurately describe the rate-dependent hysteresis of the PSA, which provides a simple method to describe and control piezoelectric actuators and piezo-driven systems in a wide frequency.

2021 ◽  
pp. 1-54
Zhi Li ◽  
Guoxin Wei ◽  
Gangyi Chen

In this paper, we obtain the classification theorems for 3-dimensional complete [Formula: see text]-translators [Formula: see text] with constant squared norm [Formula: see text] of the second fundamental form and constant [Formula: see text] in the Euclidean space [Formula: see text].

Pancreas ◽  
2021 ◽  
Vol Publish Ahead of Print ◽  
Sandeep Kumar ◽  
Daria Jach ◽  
Wendy Macfarlane ◽  
Tatjana Crnogorac-Jurcevic

Jason A. Ellis ◽  
Omer Doron ◽  
Julia R. Schneider ◽  
Catherine M. Higbie ◽  
Kay O. Kulason ◽  

2021 ◽  
Vol Publish Ahead of Print ◽  
Yuki Tsuruta ◽  
Tomoyuki Yano ◽  
Yukiko Kuramoto ◽  
Nobuko Suesada ◽  
Yuma Fuse ◽  

2021 ◽  
Vol 127 (11) ◽  
Valeria Rodríguez-Fajardo ◽  
Carmelo Rosales-Guzmán ◽  
Othmane Mouane ◽  
Daniel Wamwangi ◽  
Elias Sideras-Haddad ◽  

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