Model-based precision position and force control of SMA actuators with a clamping application

Pai, Arathi; Riepold, Markus; Trächtler, Ansgar

doi:10.1016/j.mechatronics.2017.08.011

Cited by 16 publications

(12 citation statements)

References 31 publications

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“…In addition, the displacement for a given voltage is not symmetric, which means the filter central wavelength peak is different in both cycles, i.e., increasing and decreasing sweeping voltages as it can be observed in Figure 5a. This nonlinearity can be compensated by either calibrating the filter on both up and down cycles separately or by using complex schemes of hysteresis linearization [40,41]. Furthermore, as the temperature increases, the average DC capacitance increases while the contact resistance decreases, leading to measurement errors [42].…”

Section: Resultsmentioning

confidence: 99%

Perrogator: A Portable Energy-Efficient Interrogator for Dynamic Monitoring of Wavelength-Based Sensors in Wearable Applications

Díaz

Leal‐Junior

Avellar

et al. 2019

Sensors

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In this paper, we report the development of a portable energy-efficient interrogator (Perrogator) for wavelength-based optical sensors. The interrogator is based on a compact solution encompassing a white light source and the spectral convolution between the sensor and a tunable filter, which is acquired by a photodetector, where a microcontroller has two functions: (i) To control the filter tuning and to (ii) acquire the photodetector signal. Then, the data is sent to a single-board computer for further signal processing. Furthermore, the employed single-board computer has a Wi-Fi module, which can be used to send the sensors data to the cloud. The proposed approach resulted in an interrogator with a resolution as high as 3.82 pm (for 15.64 nm sweeping range) and maximum acquisition frequency of about 210 Hz (with lower resolution ~15.30 pm). Perrogator was compared with a commercial fiber Bragg grating (FBG) interrogator for strain measurements and good agreement between both devices was found (1.226 pm/µε for the commercial interrogator and 1.201 pm/µε for the proposed approach with root mean square error of 0.0144 and 0.0153, respectively), where the Perrogator has the additional advantages of lower cost, higher portability and lower energy consumption. In order to demonstrate such advantages in conjunction with the high acquisition frequency allowed us to demonstrate two wearable applications using the proposed interrogation device over FBG and Fabry-Perot interferometer (FPI) sensors. In the first application, an FBG-embedded smart textile for knee angle assessment was used to analyze the gait of a healthy person. Due to the capability of reconstructing the FBG spectra, it was possible to employ a technique based on the FBG wavelength shift and reflectivity to decouple the effects of the bending angle and axial strain on the FBG response. The measurement of the knee angle as well as the estimation of the angular and axial displacements on the grating that can be correlated to the variations of the knee center of rotation were performed. In the second application, a FPI was embedded in a chest band for simultaneous measurement of breath and heart rates, where good agreement (error below 5%) was found with the reference sensors in all analyzed cases.

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Section: Resultsmentioning

confidence: 99%

Perrogator: A Portable Energy-Efficient Interrogator for Dynamic Monitoring of Wavelength-Based Sensors in Wearable Applications

Díaz

Leal‐Junior

Avellar

et al. 2019

Sensors

View full text Add to dashboard Cite

show abstract

“…However, the model proved useful for hysteretic effects in general and was used in numerous applications. Although the model is shown to yield highly accurate results, parameterization is challenging and it demands quite intensive processing [2,[5][6][7].…”

Section: Hysteresis In Piezoelectric Actuatorsmentioning

confidence: 99%

“…Sigmoid functions exhibit an 'S'-shaped curve with a pair of horizontal asymptotes and have been used to describe processes in numerous research fields, often with modifications to take into account specific effects [5,8,9]. Corresponding inverse models were developed and successfully used to compensate the nonlinearities [7,10].…”

Section: Sigmoid-based Hysteresis Modelmentioning

confidence: 99%

“…The approach in this work is similar to [7]. A forward model based on asymmetric sigmoid functions is used to model the piezo actuator's hysteresis.…”

Section: Sigmoid-based Hysteresis Modelmentioning

confidence: 99%

“…The forward models' parameters are optimized for good correlation with experimental data and hold for the inverse as well. For further details, please refer to [7].…”

Section: Sigmoid-based Hysteresis Modelmentioning

confidence: 99%

See 2 more Smart Citations

Open-loop linearization for piezoelectric actuator with inverse hysteresis model

Riepold¹,

Maslo²,

Ge³

et al. 2019

Vib. proced.

Self Cite

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For developing an active workpiece holder, piezo actuators are used to apply compensation forces and displacements. These actuators suffer from hysteresis effects which impair accuracy and performance. The focus of this work is the modelling of the actuator's hysteresis and establishing a corresponding inverse model to compensate the effect in an open-loop approach. The model, on the basis of easy to calculate sigmoid functions, is shown to yield good linearization of the actuator's behavior.

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Parameters Identification of a Generalized Prandtl-Ishlinskii Model for a Micro-Positioning Stage Using Mutual Shape Memory Alloy Actuators

Rahbari,

Fathi,

Dardel

2023

Exp Tech

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Model-based precision position and force control of SMA actuators with a clamping application

Cited by 16 publications

References 31 publications

Perrogator: A Portable Energy-Efficient Interrogator for Dynamic Monitoring of Wavelength-Based Sensors in Wearable Applications

Perrogator: A Portable Energy-Efficient Interrogator for Dynamic Monitoring of Wavelength-Based Sensors in Wearable Applications

Open-loop linearization for piezoelectric actuator with inverse hysteresis model

Parameters Identification of a Generalized Prandtl-Ishlinskii Model for a Micro-Positioning Stage Using Mutual Shape Memory Alloy Actuators

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