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.
Results
Showing 1 to 20 of 51 for “"Mechanical vibration"”.
-
Synthesis of Linear Mechanical Vibration Systems
Made available in DSpace on 2014-12-10T17:25:26Z (GMT). No. of bitstreams: 1 6500850.pdf: 3093824 bytes, checksum: 5b1d766d6320d4323d63ef3446a8f36a (MD5) Previous issue date: 1964
-
Ultrasound shear wave elastography imaging with external mechanical vibration
… on high-end and premium systems. External mechanical vibration (EMV) is an alternative to induce shear waves without expensive electronics, which potentially enables low-cost systems to provide SWE for point of care and low resource settings. In this thesis, an EMV concept of sinusoidally …
-
Nonlinear Behaviors Analysis and Nonlinear Characteristics Diagnosing of Mechanical Vibration Systems
… behaviors are important in dynamical analyses of mechanical systems and may provide crucial guidance to the design and control of mechanical systems. In this research, the nonlinear behavior and stability of an elastic suspended cable under combined parametric and external excitations are studied …
-
Materials and device design for MEMS piezoelectric mechanical vibration energy harvesters
Piezoelectric vibration energy harvesters (PVEHs) for microelectromechanical systems (MEMS) have received considerable attention as an enabling technology for self-powered wireless sensor networks. MEMS-PVEHs are particularly attractive because of the potential to deliver power indefinitely and …
-
Design of a low power VLSI systems powered by ambient mechanical vibration
… implementations of a generator for transducing mechanical vibration to electrical energy using macroscopic and MEMS technology. A DC/DC converter chip has been designed and tested to demonstrate the feasibility of operating a digital system from power generated by vibrations in its environment. …
-
The effect of mechanical vibration on acute power output in the bench press
… of this study was to investigate the effect of mechanical vibration on acute power output in the bench press. A total of 10 male subjects performed 3 sets of 3 reps of bench presses using a load equal to 70% one repetition maximum (1RM) on two occasions separated by 3 days. One occasion served …
-
Electrical analogs for plate equations and their applications in mechanical vibration suppression by P.Z.T. actuators
… equations of which were analogous to the ones of mechanical systems. The mentioned circuits were called ectro-mechanical analogs. They were used as analogical computers for the simulation and the design of mechanical systems. The actual technological development of piezoelectric actuators, which …
-
System identification and control of a miniature external mechanical vibration device towards clinical ultrasound shear wave elastography
… in tissues and electronic components. External mechanical vibration (EMV) is less power-exhaustive compared to ARF. Additionally, EMV-based shear waves have been shown to produce larger, local displacements in comparison to ARF-based shear waves which is beneficial for imaging deeper tissues. …
-
EFFECT OF MECHANICAL VIBRATION ON PLATINUM PARTICLE AGGLOMERATION AND GROWTH IN PROTON EXCHANGE MEMBRANE FUEL CELL CATALYST LAYER
… the current research is to study the effect of mechanical vibration on catalyst layer degradation via Platinum (Pt) particle agglomeration and growth in the membrane electrode assembly (MEA) of a proton exchange membrane fuel cell (PEM Fuel Cell). This study is of great importance, since many …
-
Research on Vibration-AE Fusion Detection Technology for Metal Particle Defect in GIS under Electromechanical Coupling Condition
… simultaneously subjected to electric field and mechanical stress, and there is a correlated influence between its insulation and vibration conditions, making insulation defect and mechanical defect the two main causes of GIS failures. For example, metal particle contamination is a typical …
-
Low Frequency Modeling and Experimental Validation of Passive Noise Attenuation in Ear Defenders
… hearing defender. Past research focused on the mechanical vibration of the cup on the seal as the main source of noise within the ear cup. This mechanical vibration, known as the piston resonance exists, and affected noise attenuation within the ear cup. A reasonably sized air leak of 160 e-7 m2 …
-
The Quantum Mechanical Hamiltonian of Rotating-Vibrating Polyatomic Molecules and an Exact Solution
An exact quantum mechanical vibration-rotation Hamiltonian for an arbitrary polyatomic molecule is obtained using well-established techniques of differential geometry. The difficulties and the ambiguities in the traditional approach to this problem--that of quantization--are then investigated. In …
-
Performance of Nonlinear Mechanical, Resonant-Shunted Piezoelectric, and Electronic Vibration Absorbers for Multi-Degree-of-Freedom Structures
Linear vibration absorbers are a valuable tool used to suppress vibrations due to harmonic excitation in structural systems. Limited evaluation of the performance of nonlinear vibration absorbers for nonlinear structures exists in the current literature. The state of the art is extended in this …
-
Molecular mechanisms involved in cell response to mechanical forces
New devices were designed to generate a localized mechanical vibration of flexible gels where human umbilical vein endothelial cells (HUVECs) were cultured. The stimulation setups were able to apply relatively large strains (30%~50%) at high temporal frequencies (140~207 Hz) in a localized …
-
Design of a fluidic test bed for MEMS piezoelectric energy harvester
… analysis is useful for simulating the vibration spectrum given off in the pipeline due to turbulent flow of the fluid. In the design of Pm pg devices, that transform the mechanical vibration to electrical energy, the scaled down model will be used as a test bed for future prototype PMPG …
-
The effects of Visual Stability Index (VSI) on fresh and hardened properties of Self Consolidating Concrete (SCC) under accelerated curing condition
… place and fills formwork without the need for mechanical vibration. SCC reduces the time and labor cost needed for concrete placement. This study is part of the proposed project by Tennessee Department of Transportation (TDOT) carried out by University of Tennessee at Chattanooga (UTC) to …
-
Development of an inexpensive test system and evaluation of the test procedures for conducting vibration tests on antivibration gloves per Iso Standard 10819
… test system was developed for conducting vibration tests on vibration attenuating gloves using ISO Standard 10819: Mechanical Vibration and Shock--Hand-Arm Vibration--Method for the Measurement and Evaluation of the Vibration Transmissibility of Gloves at the Palm of the Hand. A small …
-
Passive harmonic generation at spring contacts
… paper, a measurement system which uses acoustic vibration to locate passive intermodulation (PIM) sources in base station antennas is presented. This measurement system uses mechanical vibration to modulate the PIM signal. By introducing the acoustic vibration at different locations in the base …
-
Investigation of ultrasonic pressure distribution in a sonoreactor and a washing tank by FEM simulation
… between the acoustic pressure in water and the mechanical vibration of the solid structure. To examine the ultrasound intensity distribution in a sonoreactor with a fixed volume of water, the ultrasonic pressure distribution at different L values, which was the distance between the tip of the …
-
Vibration-to-electric energy conversion using a mechanically-varied capacitor
Past research in vibration energy harvesting has focused on the use of variable capacitors, magnets, or piezoelectric materials as the basis of energy transduction. How- ever, few of these studies have explored the detailed circuits required to make the energy harvesting work. In contrast, this …
Page 1 of 3