Smart panel with sweeping and switching piezoelectric patch vibration absorbers: Experimental results

2019 ◽  
Vol 120 ◽  
pp. 308-325 ◽  
Author(s):  
L. Dal Bo ◽  
P. Gardonio ◽  
D.E. Casagrande ◽  
S. Saggini
Keyword(s):  
Experimental Results ◽  
Vibration Absorbers ◽  
Piezoelectric Patch ◽  
Smart Panel

scholarly journals Experimental-Numerical Design and Evaluation of a Vibration Bioreactor Using Piezoelectric Patches

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 436 ◽  
Author(s):  
David Valentín ◽  
Charline Roehr ◽  
Alexandre Presas ◽  
Christian Heiss ◽  
Eduard Egusquiza ◽  
...  
Keyword(s):  
Numerical Model ◽  
Mechanical Vibration ◽  
Cell Types ◽  
Experimental Results ◽  
Cell Behavior ◽  
Frequency Range ◽  
Piezoelectric Patch ◽  
Numerical Design ◽  
Vibration Pattern

In this present study, we propose a method for exposing biological cells to mechanical vibration. The motive for our research was to design a bioreactor prototype in which in-depth in vitro studies about the influence of vibration on cells and their metabolism can be performed. The therapy of cancer or antibacterial measures are applications of interest. In addition, questions about the reaction of neurons to vibration are still largely unanswered. In our methodology, we used a piezoelectric patch (PZTp) for inducing mechanical vibration to the structure. To control the vibration amplitude, the structure could be excited at different frequency ranges, including resonance and non-resonance conditions. Experimental results show the vibration amplitudes expected for every frequency range tested, as well as the vibration pattern of those excitations. These are essential parameters to quantify the effect of vibration on cell behavior. Furthermore, a numerical model was validated with the experimental results presenting accurate results for the prediction of those parameters. With the calibrated numerical model, we will study in greater depth the effects of different vibration patterns for the abovementioned cell types.

Design of Vibration Absorbers for Step Motions and Step Disturbances

2005 ◽  
Vol 127 (1) ◽  
pp. 160-163 ◽  
Author(s):  
Joel Fortgang ◽  
William Singhose
Keyword(s):  
Time Constant ◽  
Mechanical Systems ◽  
Settling Time ◽  
Experimental Results ◽  
Performance Criteria ◽  
Vibration Absorber ◽  
Vibration Absorbers ◽  
Design Strategies ◽  
External Disturbances ◽  
Robotic Applications

Mechanical systems with flexible dynamics often suffer from vibration induced by changes in the reference command or from external disturbances. The technique of adding a vibration absorber has proven useful at eliminating vibrations from external disturbances and rotational imbalances. Traditionally, vibration absorbers have been designed for systems subject to sinusoidal or random excitations. Here the applicability of vibration absorbers to systems with steplike changes in the reference command or similar disturbances is studied. This type of motion is more common in robotic applications. Here absorbers are designed using two methods; the first technique uses a weighting on peak overshoot and settling time to allow tradeoffs between the two performance criteria. The second simpler method utilizes an eigenvalue technique to predict the time constant. Both of these techniques provide the possibility of significant improvement in settling time. The performance of this absorber design strategies is compared with previously proposed vibration absorbers and experimental results verify its utility.

Concurrent Design of Vibration Absorbers and Input Shapers

2004 ◽  
Vol 127 (3) ◽  
pp. 329-335 ◽  
Author(s):  
Joel Fortgang ◽  
William Singhose
Keyword(s):  
Feedback Control ◽  
Computer Simulations ◽  
Performance Feedback ◽  
High Performance ◽  
Experimental Results ◽  
Input Shaping ◽  
Concurrent Design ◽  
Vibration Absorbers ◽  
External Disturbances

Systems with flexible dynamics often vibrate due to external disturbances, as well as from changes in the reference command. Feedback control is an obvious choice to deal with these vibrations, but in many cases, it is insufficient or difficult to implement. A technique that does not rely on high performance feedback control is presented here. It utilizes a combination of vibration absorbers and input shapers. Vibration absorbers have been used extensively to reduce vibration from sinusoidal disturbances, but they can also be implemented to reduce the response from transient functions. Input shaping has proven beneficial for reducing vibration that is caused by changes in the reference command. However, input shaping does not deal with vibration excited by external disturbances. In this paper, vibration absorbers and input shapers are designed sequentially and concurrently to reduce vibration from both the reference command and from external disturbances. The usefulness of this approach is demonstrated through computer simulations and experimental results.

Energy Harvesting Performance of a Wing Panel for Aeroelastic Vibration

2019 ◽  
Vol 19 (09) ◽  
pp. 1950102 ◽  
Author(s):  
Xiaobiao Shan ◽  
Haigang Tian ◽  
Tao Xie
Keyword(s):  
Energy Harvesting ◽  
Output Power ◽  
Structural Parameters ◽  
Experimental Results ◽  
Vibration Energy Harvesting ◽  
Airflow Velocity ◽  
Average Output ◽  
Piezoelectric Patch ◽  
Optimal Output ◽  
Wing Panel

This paper focuses on the aeroelastic vibration energy harvesting performance of a wing panel. A nonlinear mathematical model of fluid-structure-electric coupling field was established based on the aeroelastic vibration equation and piezoelectric equation. Numerical analysis was performed to explore the influences of the airflow velocity and the piezoelectric material structural parameters on both the dynamic response and the energy harvesting performance. A small experimental wind tunnel and several prototypes of energy harvesters of the wing panel were designed and fabricated. The experimental results show that the vibration amplitude and output power of the wing panel increase with the airflow velocity; the average output power first increases until it attains the maximum values, and then decreases with the increase of the dimensionless length ([Formula: see text]/[Formula: see text] and the thickness of the piezoelectric patch. It shows that the theoretical and experimental results are in good agreement. The experimental optimal output power is 3[Formula: see text]mW at the airflow velocity of 12[Formula: see text]m/s, and the piezoelectric patch length, width and thickness of 40, 20 and 0.2[Formula: see text]mm, respectively. This work provides an effective theoretical and experimental basis for studying energy harvesting and vibration control of airfoil aircrafts.

Nonlinear Transient Dynamics of Pendulum Torsional Vibration Absorbers—Part II: Experimental Results

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
Ryan J. Monroe ◽  
Steven W. Shaw
Keyword(s):  
Torsional Vibration ◽  
Companion Paper ◽  
Experimental Results ◽  
Circular Path ◽  
Vibration Absorbers ◽  
Automotive Engine ◽  
Engine Order ◽  
Applied Torque ◽  
Centrifugal Pendulum Vibration Absorbers ◽  
Nonlinear Transient

This paper presents results from an experimental investigation of the transient response of centrifugal pendulum vibration absorbers, including a comparison with the analytical results derived in the companion paper, Part I. The focus of the study is the overshoot experienced by pendulum-type torsional vibration absorbers when a rotor running at a constant speed is suddenly subjected to an applied fluctuating torque. The experiments are carried out using a fully instrumented spin rig controlled by a servo motor that can provide user-specified engine order disturbances, including those that simulate automotive engine environments. The absorber overshoot depends on the absorber tuning relative to the excitation order, the absorber damping, the amplitude of the applied torque, and on the system nonlinearity, which is set by the absorber path and/or kinematic coupling between the rotor and the absorber. Two types of absorbers are used in the study, a simple circular path pendulum, for which the path nonlinearity is dominant, and a nearly tautochronic path pendulum with a bifilar support, for which the path and coupling nonlinearities are both small. It is found that the experimental results agree very well with the analytical predictions from the companion paper. In addition, it is confirmed that the general path pseudoenergy prediction (which depends on a single parameter) provides a useful, conservative upper bound for most practical absorber designs, provided the absorber damping is small.

Tautochronic Vibration Absorbers for Rotating Systems

2006 ◽  
Vol 1 (4) ◽  
pp. 283-293 ◽  
Author(s):  
Steven W. Shaw ◽  
Peter M. Schmitz ◽  
Alan G. Haddow
Keyword(s):  
Experimental Results ◽  
Test Facility ◽  
Vibration Absorbers ◽  
Response Curves ◽  
Rotating Systems ◽  
Response Dynamic ◽  
Applied Torque ◽  
Analytical Work ◽  
Centrifugal Pendulum Vibration Absorber ◽  
And Performance

This paper describes an analytical and experimental investigation of the dynamic response and performance of a special type of centrifugal pendulum vibration absorber used for reducing torsional vibrations in rotating systems. This absorber has the property that it behaves linearly out to large amplitudes, and thus experiences no frequency detuning. Previous analytical work on such tautochronic absorbers has considered the response, dynamic stability, and performance of single- and multi-absorber systems. In particular, it is known that these absorbers, when perfectly tuned to the order of the applied torque, do not exhibit hysteretic jumps in the response, but multi-absorber systems can experience instabilities that destroy the symmetry of their synchronous response. In this work we extend the theory to include linear de-tuning of the absorbers, which can be used as a design parameter to influence absorber performance, both in terms of rotor vibration reduction and operating range. This paper reviews the basic analysis, which employs scaling and averaging, and extends it to include the detuning. In addition, systematic experiments of systems with one and two absorbers are carried out. The experimental results are unique in that the test facility is capable of varying the excitation order, thereby allowing one to obtain order-response curves that are useful for design purposes. The experimental results are found to be in excellent agreement with the analytical predictions, and these clearly demonstrate the tradeoffs faced when selecting absorber tuning.

Vibration Absorber and Harvester for Energy Efficient Structures

2013 ◽  
Author(s):  
A. Gonzalez-Buelga ◽  
L. Clare ◽  
S. A. Neild ◽  
A. Cammarano ◽  
D. J. Wagg ◽  
...  
Keyword(s):  
Energy Efficient ◽  
Vibration Suppression ◽  
Experimental Results ◽  
Vibration Absorber ◽  
Vibration Absorbers ◽  
Tuned Mass Dampers ◽  
Sufficient Energy ◽  
Self Tuning ◽  
Self Powered

Most work has been conducted on vibration absorbers, such as tuned mass dampers, where significant energy is extracted from a structure. We investigate the concept of recovering some of this energy electrically. We present experimental results from a vibration absorber/harvester. Our results suggest that sufficient energy might be harvested such the device can be self tuning and self powered to optimize vibration suppression.

Experimental Investigation of a System With Multiple Nearly Identical Centrifugal Pendulum Vibration Absorbers

2003 ◽  
Author(s):  
Tyler M. Nester ◽  
Alan G. Haddow ◽  
Steven W. Shaw
Keyword(s):  
Experimental Investigation ◽  
Theoretical Background ◽  
Experimental Results ◽  
Circular Path ◽  
Vibration Absorbers ◽  
Test Apparatus ◽  
Controlled Experiments ◽  
Theoretical Predictions ◽  
Centrifugal Pendulum Vibration Absorbers ◽  
First Time

This paper presents experimental results from tests completed on a rotor system fitted with nearly-identical circular path centrifugal pendulum vibration absorbers. A brief review of theoretical background for the absorbers is given along with an overview of the test apparatus. The experimental results for one absorber and for four absorbers are presented and compared with theoretical predictions and expectations. To the best knowledge of the authors, this is the first time that systematic, controlled experiments that monitored both the response of the absorbers and the rotor have been undertaken.

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