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Showing 1 to 20 of 65 for “"Isolator"”.
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Active vibration isolation with a distributed parameter isolator
Conventional vibration isolators are usually assumed to be massless for the purpose of modelling. This simplification tends to overestimate the isolator performance because of neglecting the internal resonances (IRs) due to the distributed mass effects in the isolator, which is especially important …
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Growth and characterization of bismuth perovskite thin films for integrated magneto-optical isolator applications
… the motivation for integrated magneto-optical isolators and explain why the orthoferrite is such an attractive materials class for this purpose. We then derive from first physical principles the dependence of Faraday rotation, absorption, and certain figures of merit on the material's …
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Improved seismic isolation for the Laser Interferometer Gravitational Wave Observatory with hydraulic external pre-isolator system
… The system is called the Hydraulic External Pre-Isolator (HEPI), which uses position and geophone sensors, ground seismometers, and hydraulic actuators to suppress payload motion. HEPI prototype was designed and tested in 2003 and installed on site in 2004. The first stage of HEPI commissioning …
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Internal Resonances in Vibration Isolators and Their Control Using Passive and Hybrid Dynamic Vibration Absorbers
Conventional isolation models deal with massless isolators, which tend to overestimate the isolator performance because they neglect the internal resonances (IRs) due to the inertia of the isolator. Previous researches on the IR problem is not adequate because they only discussed this problem in …
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Isolation and transmissibility of shipboard equipment with carbon fiber reinforced polymer mount
… equipment and disrupt normal operations. Isolator pads can be used to dampen transmissions from equipment to the ship and vice versa. In this thesis isolator pads of three different materials were considered: carbon fiber reinforced material (CFRP), steel, and rubber. These isolator pads …
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Mitigating Engine Unstart in Scramjets with Porous Bleeders
… in mitigating unstart phenomena and enhancing isolator effectiveness in a hypersonic scramjet was investigated. Through computational fluid dynamics simulations, the impact of porous bleeder design parameters such as pressure jump coefficient and bleeder size on isolator effectiveness and …
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Dynamics and Control for Vibration Isolation Design
… frequency transmissibility increases when the isolator has passive damping although this does not occur for an isolator implementing active damping. A severe limitation of this system is that it cannot be used when the base and/or equipment are flexible. System flexibility has been considered …
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Development of high power fibre amplifier components, systems and applications
… and the development of a fibre-in beam-out isolator for use with fibre lasers. The first project developed a fibre Raman amplifier which amplified a 10mW narrow linewidth DFB laser at 1651nm to an output power of over 2W. To achieve this high output power from a narrow linewidth Raman …
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Six degree of freedom active vibration isolation using quasi-zero stiffness magnetic levitation.
… mechanical systems. Many traditional vibration isolator designs suffer from the trade-off between load capacity and isolation performance. Furthermore, in providing sufficient stiffness in the vertical direction to meet payload weight requirements, isolators are generally overly stiff in the …
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Experimental and numerical study of hypersonic aeroelastic intakes
… ramp, a cowl, and an internal flow path (isolator). The intake model was designed to be tested under four configurations, each of which explored a unique structural boundary condition. The experiments were conducted at the TUSQ hypersonic facility in Queensland, Australia, at Mach 5.85 …
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Evaluation of on-chip integration of magneto-optic isolators
… of on chip integration of magneto-optic isolators is reviewed. Two major categories of structural designs for waveguide isolator (nonreciprocal mode conversion and nonreciprocal phase shift) have both merits and short comings for integration. The advances in integration techniques and …
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Effectiveness of a closed system device in reducing occupational exposure and environmental concentrations of anticancer drugs
… environmental emissions of these drugs. In the Isolator study, surface contamination arising from the preparation of five anticancer drug infusions (epirubicin, fluorouracil, cisplatin, oxaliplatin and carboplatin) in a pharmaceutical isolator and external surfaces of infusion bags and syringes …
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Optimization of Hypersonic Airbreathing Propulsion Systems through Mixed Analysis Methods
… using three different engine components: the isolator, combustor, and nozzle. For each component a set of intensive properties are iterated to match prescribed conditions, namely the mass flow. These low-fidelity one-dimensional models of hypersonic propulsion systems are used in tandem with …
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Active, Passive and Active/Passive Control Techniques For Reduction of Vibrational Power Flow in Fluid Filled Pipes
… demonstrated. The effectiveness of the rubber isolator in reducing structural waves has been demonstrated. Improved performance of the quarter wavelength tube and Helmholtz resonator was obtained on implementation of the rubber isolator on the experimental rig. Active control experiments using …
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Novel materials for silicon based photonics
… components: a light source, usually lasers, an isolator, a waveguide, a modulator and a photodetector. Limited by material intrinsic properties, silicon alone cannot realize all the above mentioned functions. The development of silicon photonics has found its way through exploiting novel …
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One Dimensional Analysis Program for Scramjet and Ramjet Flowpaths
… flow path into four major components: inlet, isolator, combustor, and nozzle. The inlet module provides two options for supersonic inlet one-dimensional calculations; a correlation from MIL Spec 5007D, and a kinetic energy efficiency correlation. The kinetic energy efficiency correlation also …
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Design and Characterization of Tunable Magneto-Rheological Fluid-Elastic Mounts
… stiffness and damping levels within the isolator to create an adaptable and tunable feature. To achieve this adaptable isolator mount, a mold will be fabricated to construct the mounts. A process will then be devised to manufacture the mounts and place MR fluid inside the mount for later …
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Computational analysis of plasma actuation for control of shock-laden flows in scramjet isolators
… actuators for active flow control in scramjet isolators. A computational framework was developed to model internal supersonic flows with plasma actuation. The Reynolds-averaged Navier-Stokes (RANS) equations coupled with Menter’s Shear Stress Transport (SST) turbulence model were used to …
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Brillouin scattering induced transparency: Coherent optomechanical interaction leading to slow light and non-reciprocal light transmission
An optical isolator is a device that allows only one-way light transmission. It is an essential optical component used for protection of laser sources found in many applications such as undersea optical communication networks, spectroscopy, fluorescence microscopy, and laser cutting. Today, all …
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