A temperature-dependent control technique for a highly sensitive piezoelectric actuator

2016 ◽  
Author(s):  
Didace Habineza ◽  
Mahmoud Zouari ◽  
Micky Rakotondrabe ◽  
Yann Le Gorrec
Keyword(s):  
Piezoelectric Actuator ◽  
Control Technique ◽  
Temperature Dependent ◽  
Highly Sensitive

Active Control of Elastodynamic Vibrations of a Flexible Mechanism With Piezoelectric Actuator

1999 ◽  
Author(s):  
Ching-I Chen
Keyword(s):  
Control Theory ◽  
Active Control ◽  
Piezoelectric Actuator ◽  
Control Strategies ◽  
Piezoelectric Actuators ◽  
Structural Vibration ◽  
Control Technique ◽  
Vibration Modes ◽  
Time Sharing ◽  
Transient Dynamic

Abstract This study focused on the application of active vibration control strategies for flexible moving structures which degrade into transient dynamic vibration problem. These control strategies are based primarily on modal control methods in which the flexible moving structures are controlled by reducing their dominant vibration modes. This work numerically investigated active control of the elastodynamic response of a four-bar mechanical system, using a piezoelectric actuator. A controller based on the modified independent modal space control theory was also utilized. This control theory produced overall excellent performance in terms of achieving the desired closed-loop structural damping. The merits of this technique include its ability to manage the spill-over effect, i.e. eliminate the magnitude of vibrations associated with uncontrolled modes, using only a few selected modes for control. This control was accomplished using a time sharing technique, which reduces the number of piezoelectric actuators required to control a large number of vibration modes. Furthermore, this algorithm implements a procedure for determining the optimal locations for the piezoelectric actuators. The dynamics of a steel four-bar linkage was selected with a flexible coupler separated by six elements and one piezoelectric actuator was used in the numerical simulation. The optimal actuator position was located at the third element from the right to the left. Results in this study demonstrated that a highly desired the structural vibration damping could be achieved. This control technique can be applied to transient dynamic systems.

scholarly journals Random terpolymer based on thiophene-thiazolothiazole unit enabling efficient non-fullerene organic solar cells

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Jingnan Wu ◽  
Guangwei Li ◽  
Jin Fang ◽  
Xia Guo ◽  
Lei Zhu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
High Efficiency ◽  
Temperature Dependent ◽  
Polymer Backbone ◽  
Positive Effects ◽  
Highly Sensitive ◽  
Aggregation Property ◽  
Reduced Temperature

Abstract Developing a high-performance donor polymer is critical for achieving efficient non-fullerene organic solar cells (OSCs). Currently, most high-efficiency OSCs are based on a donor polymer named PM6, unfortunately, whose performance is highly sensitive to its molecular weight and thus has significant batch-to-batch variations. Here we report a donor polymer (named PM1) based on a random ternary polymerization strategy that enables highly efficient non-fullerene OSCs with efficiencies reaching 17.6%. Importantly, the PM1 polymer exhibits excellent batch-to-batch reproducibility. By including 20% of a weak electron-withdrawing thiophene-thiazolothiazole (TTz) into the PM6 polymer backbone, the resulting polymer (PM1) can maintain the positive effects (such as downshifted energy level and reduced miscibility) while minimize the negative ones (including reduced temperature-dependent aggregation property). With higher performance and greater synthesis reproducibility, the PM1 polymer has the promise to become the work-horse material for the non-fullerene OSC community.

scholarly journals Correction: Cubic mesoporous Pd–WO3 loaded graphitic carbon nitride (g-CN) nanohybrids: highly sensitive and temperature dependent VOC sensors

2020 ◽  
Vol 8 (38) ◽  
pp. 20185-20186
Author(s):  
Ritu Malik ◽  
Vijay K. Tomer
Keyword(s):  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Temperature Dependent ◽  
Highly Sensitive ◽  
Cubic Mesoporous

Correction for ‘Cubic mesoporous Pd–WO3 loaded graphitic carbon nitride (g-CN) nanohybrids: highly sensitive and temperature dependent VOC sensors’ by Ritu Malik et al., J. Mater. Chem. A, 2018, 6, 10718–10730, DOI: 10.1039/C8TA02702A.

From structural phase transition to highly sensitive lifetime based luminescent thermometer: multifaceted modification of thermometric performance in Y0.9-xNdxYb0.1PO4 nanocrystals

2021 ◽  
Author(s):  
Kamila Maciejewska ◽  
Marcin Szalkowski ◽  
Artur Bednarkiewicz ◽  
Lukasz Marciniak
Keyword(s):  
Phase Transition ◽  
Structural Properties ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Deep Understanding ◽  
Luminescent Properties ◽  
Host Material ◽  
Temperature Dependent ◽  
Highly Sensitive

The development of highly sensitive luminescent thermometer requires deep understanding of the correlation between structural properties of the host material with temperature-dependent luminescent properties of lanthanide emitters embedded in these...

The influence of dopant concentration on temperature dependent emission spectra in LiLa1−x−yEuxTbyP4O12 nanocrystals: toward rational design of highly-sensitive luminescent nanothermometers

2016 ◽  
Vol 18 (23) ◽  
pp. 15584-15592 ◽  
Author(s):  
L. Marciniak ◽  
A. Bednarkiewicz
Keyword(s):  
Temperature Sensitivity ◽  
Rational Design ◽  
Dopant Concentration ◽  
Emission Spectra ◽  
Temperature Dependent ◽  
Sensing Range ◽  
Highly Sensitive

Luminescence nanothermometry is gaining great interest, and different excitation and readout schemes have been sought to improve temperature sensitivity and sensing range, or to simplify the readout.

Pulsed–Raman Measurements of Temperature When Large Temperature Variations and Gradients are Present

1981 ◽  
Vol 4 ◽  
Author(s):  
R. F. Wood ◽  
M. Rasolt ◽  
G. E. Jellison
Keyword(s):  
Laser Annealing ◽  
Pulsed Laser ◽  
Surface Region ◽  
Large Temperature ◽  
Temperature Dependent ◽  
Pulsed Laser Annealing ◽  
Highly Sensitive ◽  
Experimental Parameters ◽  
Anti Stokes ◽  
Straightforward Interpretation

ABSTRACTPulsed Raman temperature measurements by Lo and Compaan on Si samples have been interpreted as proving that the surface region does not melt during intense pulsed laser irradiation. In this paper, it is shown by detailed calculations with the melting model that the choice of experimental parameters in the Raman measurements can severely compromise a straightforward interpretation of the data. Moreover, it is demonstrated that temperatures extracted from Raman measurements are highly sensitive to the temperature-dependent optical properties of the material. Finally, it is pointed out that the very large temperature gradients present during pulsed laser annealing may entirely invalidate the Stokes/anti-Stokes ratio as an accurate temperature probe.

Highly sensitive, temperature-dependent gas sensor based on hierarchical ZnO nanorod arrays

2015 ◽  
Vol 3 (43) ◽  
pp. 11397-11405 ◽  
Author(s):  
Xiaomei Wang ◽  
Fazhe Sun ◽  
Yongqing Duan ◽  
Zhouping Yin ◽  
Wei Luo ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Process Parameters ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Optimal Process ◽  
Temperature Dependent ◽  
Measuring Range ◽  
Highly Sensitive ◽  
Gas Response

The hierarchical ZnO-NAs sensor shows highly sensitive, repeatable on–off cycles and temperature dependent response to NO2. The optimal process parameters of the MES-CHSM are presented to achieve optimal morphology, enlarge gas response and measuring range.

Vibration Control of Truss Structure by Piezoelectric Actuator

1994 ◽  
Vol 6 (3) ◽  
pp. 208-213
Author(s):  
Yuzo Shibayama ◽  
◽  
Koji Sekine ◽  
Takuma Sakata ◽  
Takayoshi Hatayama ◽  
...  
Keyword(s):  
Vibration Control ◽  
Piezoelectric Actuator ◽  
Active Vibration Control ◽  
Truss Structure ◽  
Control Technique ◽  
Type Ii ◽  
Large Space ◽  
Electric Actuator ◽  
The One ◽  
Piezo Electric

An active vibration control technique is one of the important technical subjects for the large space structures (LSS). In the LSS, the one-board instruments need more strict directional precision as the sizes and flexibility of structures increase. With this background, a piezoelectric actuator Type-II for vibration control has been experimental developed, which has five multilayered piezo-electric devices. An attempt has been made to incorporate the actuator Type-II into active members of a truss structure, which is a 6-bay, 1.8m-high truss, and to control its vibration. This paper presents an outline of the piezo-electric actuator Type-II and some experimental results which show the vibration control capabilities of the actuator Type-II.

Monitoring of environmental loading effect on the steel with different plastic deformation by diffuse ultrasound

2018 ◽  
Vol 18 (2) ◽  
pp. 602-609 ◽  
Author(s):  
Fan Xie ◽  
Weibin Li ◽  
Yuxiang Zhang
Keyword(s):  
Plastic Deformation ◽  
Mechanical Load ◽  
Early Stage ◽  
Coda Wave ◽  
Temperature Dependent ◽  
Plastic Deformations ◽  
Highly Sensitive ◽  
High Manganese Steels ◽  
Velocity Changes ◽  
Diffuse Ultrasound

Diffuse ultrasound is highly sensitive to changes in mechanical properties. Based on the coda wave interferometry analysis, we investigate the environmental temperature-induced wave velocity variations in high-manganese steels with plastic deformations by diffuse ultrasound. We observe the velocity changes in the materials at test with [Formula: see text] relative resolution. We propose the temperature-dependent coefficient as the key parameter for damage assessment in the specimens with different plastic deformations. The results show that the early-stage damage caused by plastic deformation in the specimens at test varying from 6% to 14% are successfully characterized by temperature-dependent coefficients in the absence of external mechanical load. The theoretical analysis on the sensitivity of the temperature-dependent coefficient to plastic deformation as well as the potential on-site application is discussed in this article.

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