... strategy, the error of the poppet displacement is reduced from 4.9% to 2.1% by adjusting the spool displacement in the pilot stage in real-time and the flow error is reduced from 5.3% to 2.3%. The dead zone of the poppet displacement and the flow is eliminated. The hysteresis is reduced from 5.3% to 2.6...

... Zou. 10 10 2012 16 07 2014 Piezo-electric actuators (PEAs) have been widely used in nanopositioning applications due to their high stiffness, fast responses, and large actuating forces. However, the existence of nonlinearities such as hysteresis can greatly deteriorate...

... actuator can achieve force and stroke comparable to a contractile PAM tested under the same conditions. pneumatic artificial muscle blocked force free contraction pressure dead band hysteresis nonlinear elastic analysis Pneumatic artificial muscles (PAMs) harness pressurized air...

... EASUREMENT, AND C ONTROL . Manuscript received November 3, 2011; final manuscript received June 13, 2013; published online August 23, 2013. Assoc. Editor: Nader Jalili. 03 11 2011 13 06 2013 This paper describes an H ∞ control method for controlling hysteresis in a piezoelectric stack...

..., the effects of the temperature must be considered, given the particularly critical position of the injectors near the engine. A modeling approach of piezoelectric injectors, including hysteresis and temperature effects as well as the electromechanical dynamic, is described in this paper. The model is based...

.... It is shown that hub friction increases with the applied force with the end-point force exhibiting significant hysteresis behavior. A friction model is presented for capturing these phenomena and compared with the widely used LuGre friction model. Effectiveness of the proposed model for friction compensation...

... units having pronounced hysteresis and long latency time in transient response. It will be shown that slow response and poor stability due to the hysteresis and latency time can significantly be improved by coordinating the multitude of cellular units, which are in diverse phases in the hysteresis loop...

... distributed signal, many of the data points are clustered near zero. This is an advantage for observing hysteresis but somewhat limits the amount of data postyield. Distribution of a sample velocity signal (left) and a sample current signal (right). The current signal especially shows the effect...

...Qingsong Xu; Yangmin Li This paper presents a new control scheme for the hysteresis compensation and precise positioning of a piezoelectrically actuated micromanipulator. The scheme employs an inverse Dahl model-based feedforward in combination with a repetitive proportional-integral-derivative...

...Saeid Bashash; Nader Jalili A set of memory-based properties is employed in this paper for modeling multiple-path hysteresis response of piezoelectric actuators. These properties, namely, targeting turning points, curve alignment, and wiping-out effect, are applied in a linear mapping strategy...

...T.-J. Yeh; Shin-Wen Lu; Ting-Ying Wu In this paper, a model and the associated identification procedure are proposed to precisely portray the hysteresis behavior in piezoelectric actuators. The model consists of basic physical elements and utilizes a Maxwell-slip structure to describe hysteresis...

...Ying-Shieh Kung, Associate Professor,; Rong-Fong Fung, Professor, In this paper, a control method combining the feedforward and feedback controllers is proposed to precisely control the dynamic performance of the piezoceramic actuator (PA). In the feedforward controller design, the hysteresis...

... displacement. Since in this algorithm the current to each coil is cyclic as the rotor tooth advances, several cycles can be used to achieve the desired angular displacement of the motor. This process can result in a reduction or “scaling down” of magnetic nonlinearities such as hysteresis and saturation...

...Meng-Shiun Tsai; Jin-Shin Chen A new approximate model, which consists of a variable gain and a variable time-delay, is proposed to describe the hysteresis behavior of a piezoactuator. The variable gain is assumed to be a function of the magnitude of the input command, while the time-delay...