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 21 for “"vibration measurement"”.
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A wireless sensor network for vibration measurement
Wireless sensor networks (sensornets) enable distributed sensing, opening up sensing possibilities not previously available. One application of sensornets is online, non-intrusive power transformer monitoring.
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Video camera-based vibration measurement of infrastructure
… testing have emerged over time. These include vibration analysis, in which a structure's operational resonant frequencies and mode shapes are measured and compared against a healthy baseline to detect changes. Typically, contact sensors such as accelerometers have been used to measure …
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A distributed data acquisition network for vibration measurement
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Vibration Measurement Based Damage Identification for Structural Health Monitoring
… focus of this research is on the development of vibration response-based damage detection in civil engineering structures. Modal parameter-based and model identification-based approaches have been considered. In the modal parameter-based approach, the flexibility and curvature flexibility …
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The application of laser doppler technique to vibration measurement and position control.
… to investigate the possibilities of remote vibration and motion measurements. The method is noncontacting and operates with unprepared targets, using the diffusely scattered light to measure the axial component of the motion. A full description of the motion requires both magnitude and …
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Design of a non-contact vibration measurement and analysis system for electronic board testing
Traditional vibration measurement methods involve placing accelerometers at discrete locations on a test object. In cases where the test specimen is small in mass, the addition of these measurement transducers can alter its dynamic behavior and lead to erroneous test data. In this thesis a …
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Development of a decision support system for assessment of mobile bridges
… procedure and a previously established vibration measurement technique.;Conforming to the design requirements, the DSS has been developed as an Internet based, interactive application, and is integrated with an automated vibration measurement system. The web-based DSS, which incorporates …
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Experimental characterization of the dynamic response of a mock-up CANDU fuel bundle
This thesis discusses the vibration response of a mock-up CANDU 37M fuel bundle. The experiments are performed using non-invasive methods of vibration measurement by means of high-speed cameras and laser displacement sensors. The contact dynamics between the fuel bundle and the pressure tube are …
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Demonstration of active structural acoustic control of cylinders
… on the cylinder that cancel the noise-generating vibration. This technique is called Active Structural Acoustic Control (ASAC) (Fuller, 1987). Sensors are implemented using piezoelectric film, and actuators are implemented using piezoceramic material. Both analog and digital noise cancellation …
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Operational Modal Analysis of Rolling Tire: A Tire Cavity Accelerometer Mediated Approach
The low frequency (0-500 Hz) automotive noise and vibration behavior is influenced by the rolling dynamics of the tire. Driven by pressing environmental concerns, the automotive industry has strived to innovate fuel-efficient and quieter powertrain systems over the last decade. This has eventually …
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Distributed Vibration Sensing using Rayleigh Backscatter in Optical Fibers
… using OFDR as a means of obtaining distributed vibration measurements using the Rayleigh scatter along a single-mode optical fiber. The effort begins by discussing various distributed measurement techniques currently in use before discussing the OFDR technique. Next, a thorough discussion on how …
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Construção e balanceamento de um cilindro a alta rotação
… of the system. That was obtained through the vibration measurement at each one of the shaft-plates in three different arrangements: 1. the rotor as built up. 2. the rotor with a known weight in one of the shaft-plates. 3. the rotor with the sarne known weight at the other shaft- plate. So we …
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Towards Multiclass Damage Detection and Localization using Limited Vibration Measurements
Traditional vibration-based damage detection methods provide structural health information based on their measured data (i.e., acceleration and displacement response). Over the last few decades, various model-based and time-frequency methods have shown great promises for damage identification and …
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Static Misalignment Effects is a Self-Tracking Laser Vibrometry System for Rotating Bladed Disks
… Whereas full-field three-dimensional velocity measurements can be made on stationary structures, the capability on rotating structures is limited to low speed, one-dimensional, steady state operation. This work describes the implementation of a self-tracking laser vibrometry system which …
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Theoretical and Experimental Studies of Manipulation of Elastic Waves in Helix Metamaterials
… bandgap; Controllable design; Laser vibration measurement; Strong vibration attenuation; Carrera Unified Formulation Abstract Elastic metamaterials exhibit mechanical properties unattainable in natural materials and demonstrate vast potential in vibration and noise reduction, acoustic …
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Dynamic Strain Measurement Using Brillouin Optical Time-Domain Reflectometry
… oil and gas industries. Therefore, the dynamic measurement of strain using the BOTDR system is a very practical and promising topic, especially for the civil engineering related industries. In this study, a BOTDR optical system is set up. A high extinction ratio modulator is chosen to overcome …
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Using vibration-based monitoring to detect mass changes in satellites
Vibration-based structural health monitoring could be a useful form of determining the health and safety of space structures. A particular concern is the possibility of a foreign object that attaches itself to a satellite in orbit for adverse reasons. A frequency response analysis was used to …
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Advanced functional and sequential statistical time series methods for damage diagnosis in mechanical structures
… 30 years have witnessed major developments in vibration based damage detection and identification, also collectively referred to as damage diagnosis. Moreover, the past 10 years have seen a rapid increase in the amount of research related to Structural Health Monitoring (SHM) as quantified by …
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Měření vibrací na obráběcích strojích
Obsah tejto práce je zameraný na všeobecný úvod do vibrodiagnostiky, počínajúc definovaním a rozdelením vibrácií. Ďalej práca opisuje teóriu získavania údajov o intenzite vibrácií. Táto časť zahrňuje aj typy snímačov, ktorými meriame vibrácie. Praktická časť sa zaoberá meraním a vyhodnotením …
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Optimal placement of sensor and actuator for sound-structure interaction system
… and sensors are highlighted by experimental vibration and acoustic noise attenuation for arbitrary disturbance using feedback controllers with optimal placement of actuator and sensor. The disturbance is experimentally set to enter the system via a spatial location different from the …
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