Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"piezoelectric sensors"”.
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Novel Shear Mode Piezoelectric Sensors and Their Applications.
North Carolina State University Theses Mechanical and Aerospace Engineering.
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Robot gripper control system using PVDF piezoelectric sensors
… control system is presented which uses PVDF piezoelectric sensors to actively damp exerted force. By using a low-input-resistance amplifier to sense the current developed by the PVDF sensor, an output proportional to the rate of change of the force exerted by the gripper is obtained. The …
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Structural Health Monitoring Using Multiple Piezoelectric Sensors and Actuators
A piezoelectric impedance-based structural health monitoring technique was developed at the Center for Intelligent Material Systems and Structures. It has been successfully implemented on several complex structures to detect incipient-type damage such as small cracks or loose connections. However, …
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Broadband active structural control using collocated piezoelectric sensors and actuators
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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A feasibility study of PVDF piezoelectric sensors to detect damage in adhesive joints
… easily etched into sensor devices. Since these sensors are relatively inexpensive, thin and light-weight, they can be attached to adhesively bonded joints permanently to measure bond integrity. The present study shows the different steps to design such sensors and proper techniques to attach …
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Design and Fabrication of Piezoelectric Sensors and Actuators for Characterization of Soft Materials
… supports the overall goal of creating piezoelectric measurement technology for the analysis and characterization of soft materials that serve as feedstocks (inputs) and products (outputs) of emerging biomanufacturing processes, including cell and additive biomanufacturing processes. The …
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Toward Wireless Wearable Devices Based on Biocompatible AlN Piezoelectric Sensors for Multiple Biosignal Monitoring
L'abstract è presente nell'allegato / the abstract is in the attachment
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Investigation Into Use of Piezoelectric Sensors in a Wheeled Robot Tire For Surface Characterization
… was used to investigate the potential of using piezoelectric film sensors in small tube-type pneumatic tires to characterize tire-ground interaction.<br />One focus of recent research in the tire industry has been on instrumenting tires with sensors to monitor the tire, vehicle, or external …
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The development of poly(vinylidene fluoride) piezoelectric sensors for measuring peel stresses in adhesive joints
… fluoride) film was used to develop piezoelectric stress sensors. The sensitivities of the film to normal stresses in the three principal material directions of the orthotropic film were accurately measured using a charge amplifier and a storage oscilloscope. These measured …
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Design and Testing of Off-The-Shelf Electronic Components for an Acoustic Emission Structural Health Monitoring System Using Piezoelectric Sensors
… and passive acoustic emission through the use of piezoelectric sensors as the sensing elements. Piezoelectric sensors can be used both as an input device and as a sensing element. This research focuses on the development of the major data acquisition electronic components of the system. These …
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Active control of sound transmission through plates in a reverberant environment
… Active acoustic control is performed using piezoelectric sensors and actuators bonded to the plate. The control technique uses an adaptive control algorithm. Results are presented for harmonic excitation provided by a speaker in the source chamber at two resonant frequencies of the plate. …
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Blast diagnostic tools and techniques: a review
… Thus, it is imperative to choose appropriate sensors and measurement techniques to consistently acquire useful data. Past studies conducted in diagnostics of energetic materials were focused on the energy release and the material properties, but very few, if any, placed an emphasis on the …
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Design of, and initial experiments with, a MIMO plate control testbed
… and initial control experiments. The piezoelectric sensors and actuators are arranged on the plate to control the first five vibration modes. The sensors measure plate positions using a high impedance signal conditioning amplifier. The sixteen-channel design implements a band-pass …
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Piezoelectric active sensor and electric impedance approach for structural dynamic measurement
The increasing use of piezoelectric material in the last decade has led to the new discovery that piezoelectric devices may be used not only as sensors or actuators individually, but also as a sensor and actuator at the same time. This bi-directional phenomenon greatly expands the utility of …
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Monitoring Progressive Damage Development in Laminated Fiber Reinforced Composite Materials
… acoustic waves that are acquired by installed piezoelectric sensors. A numerical method to estimate the arrival of wave modes from ultrasonic signals is presented. Methods are also presented that utilize PLB signals to indicate approaching failure of specimens under monotonic as well as cyclic …
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Vibration Attenuation of Composite Moving Beams using Active Vibration Control Techniques
… vibration control technique that employs the piezoelectric effect. Piezoelectric sensors and actuators are added to the beam to sense and control the vibrational response of the moving beam. The sensors and actuators are made to communicate with each other using negative velocity feedback …
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Dual-Use Strain Sensors for Acoustic Emission and Quasi-Static Bending Measurements
The application of piezoelectric sensors such as the ultrasonic transducer has significantly enhanced the fields of nondestructive evaluation (NDE). Their application of piezoelectric materials allows for the sensing of low energy, high frequency acoustic emission (AE) events such as fatigue …
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QUANTIFICATION OF PRETERM INFANT FEEDING COORDINATION: AN ALGORITHMIC APPROACH
… measured through the use of several different piezoelectric sensors. In addition to feeding signals, electrocardiogram (ECG) signals were obtained as an indicator of overall infant behavioral state during feeding. Event detection algorithms for the individual feeding signals were developed and …
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Characterization, Modeling, and Control of Ionic Polymer Transducers
… is based. The capabilities of ionic polymer sensors and actuators, when used in the cantilevered bender configuration, are discussed and compared to piezoceramic and piezo polymer cantilevered benders. The energy density of all three actuators are within an order of magnitude of one another, …
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Towards a Self-Powered Structural Health Monitoring Smart Tire
… health monitoring (SHM) smart tire using piezoelectric materials. While this work is divided into two components: SHM and energy harvesting, the context of smart tire in this work is defined as the development of a SHM system that (i) has self-powering capabilities, and (ii) addresses the …
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