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 18 of 18 for “"Bushing"”.
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Structure-thermal coupling in viscoelastic material in rubber bushing of vehicle system
… and characterize the dynamic response of rubber bushing under external excitation. Furthermore, with appropriate modeling, two heat generation mechanisms of rubber bushing are explored and their thermal fields are investigated. Due to the nonlinear force-deflection relationship of the …
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Seismic response of transformer bushing systems and their rehabilitation using frictional pendulum system
… the description of the transformers, attached bushings, and some typical examples of substation failures in earthquake loading. This is followed by the development of finite element model of three different sizes of transformers. Finite element models consist of several thousand degrees of …
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Active control of an automobile suspension system for reduction of vibration and noise
… into the automobile primary through a single bushing (the "point 4 bushing") on each of the front suspension control arms. An electromagnetic actuator was designed, built, and tested on a Lincoln LS with simulated roads noise. The actuator applies a force across the point 4 bushing, in …
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Measurement of air temperatures and velocities in the fiber glass forming environment
… through an array of small orifices in a heated bushing plate and then drawing the glass onto a winder. Upon exiting the orifices, the fibers pass through a cloud of atomized water to assist in the cooling of the fibers and then over a surfactant applicator before they are wound. The rate at …
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Protection of High-Voltage Transformer Bushings and Other Brittle Structures Against Impact
… of porcelain high-voltage (HV) transformer bushings under high-velocity impact, with a focus on their protection with feasible methods which could be quickly applied in service to prevent vandalism and other undesirable impact situations. The bushings are brittle and pressurized; prone to …
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Partial discharge signal propagation, modelling and estimation in high voltage transformer windings
… PD propagation signal towards the neutral and bushing tap-point. At the source, a D’Alembert solution is employed to estimate the oscillation level and found to be in very good agreement with measured data using rectangular wave signal injection. PD signal behaviour is then considered using a …
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The role of system dynamics on the behavior of elastomeric friction
… an epoxy coated shaft rotating in an elastomeric bushing is investigated. This study investigates the manner in which system dynamics and friction mechanisms are responsible for friction induced vibration and noise generation. A test method was developed to measure the friction torque and the …
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Finite Element Procedures in Modelling the Dynamic Properties of Rubber
… the first two papers, a radially loaded rubber bushing was modelled in the third paper. The material properties of the finite element model were based on dynamic shear tests. The dynamic response of the finite element model of the bushing was then compared to measurements of a real bushing. …
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LUBRICATION STUDY OF AN OSCILLATING BEARING
… at various loads and speeds in a hardened steel bushing. From the results it was concluded that there were possibly four regimes of operation. The coefficient of friction with constant load and increasing speed was found to decrease and then to increase. Three methods were used in the …
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A financial analysis of producing pellets from the encroacher bush Senegalia Mellifera as a potential livestock feed: A cost benefit analysis approach
… should also provide encroacher bush de-bushing programms to help with high de-bushing costs.
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A theoretical and experimental investigation of the BTA deep hole tool support in the machining zone
… support pads and the surrounding hole as a guide bushing to steer itself along the hole being machined. The piloting hole, in conjunction with the two support pads, provides for the tool balance in the hole transverse cross-section. However, in the axial section plane, the tool alignment with the …
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Dispersion of water sprays in a transverse air jet and the aging of spray nozzles
… glass through an array of holes in a heated bushing plate. Before the fibers can be wound onto a spool, the fibers must be coated with a sizing compound. In order for the sizing compound to be applied, the glass fibers must be cooled to a temperature below 90°C or so. Heat losses through …
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Improvement of distribution transformer fault analysis using FRA method
… other failures such as winding deformation, bushing and short circuit faults. In addition, the tap changer fault and weakness of clamping structure are also investigated by examining an 11/0.433 kV, 500KVA distribution transformer. Additionally, the transformer ageing and degradation of …
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Transformer Thermal Assessment under Geomagnetically Induced Current Conditions
… approach is proposed to determine the HST of OIP bushing based on the FEM-modified thermal equivalent circuit (TEC) model. The proposed model can accurately estimate the HST of the bushings under normal and GIC conditions. Furthermore, a detailed thermal analysis is performed to investigate the …
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Investigation and analysis of the causes of 11/0.4 kV distribution transformers' high failure rate : case study - Swaziland Electricity Company
… failed unit, for instance, winding damage and bushing damage. Footing resistances were also recorded at the transformer structures and if there was a need, they were reduced to 10 Ω or less using the crowfoot earthing method or a combination of the crowfoot earthing method and conductive cement.
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Frictional oscillations in elastomeric sliding
… stabilizer bar, rotating in an elastomeric bushing. The focus of the research is to determine the conditions under which noise or stick-slip occurs. Elastomers tested include natural rubber with 0,5,10, 20, and 50 phr (parts per hundred rubber) carbon black, butyl, polydimethyl siloxane, and …
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Energy and Thermodynamically Based Approaches for Analysis of Damage in Contact Problems
… pin-on-flat reciprocating dry sliding and pin-bushing grease-lubricated oscillatory sliding. It is shown that the wear rate is linearly related to the power dissipation as well as the entropy generation rate. The linear correlations are verified experimentally. Degradation coefficient is …
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Creation and Validation of a Dynamic, EMG-Driven Cervical Spine Model
… turned into 3D models. The discs were modeled as bushing forces. The ligaments were modeled as single vector forces. Each ligament consisted of three vectors, which enables the model to calculate shear as well as force on the ligament. The muscles were modeled as straight line force vectors …