220 results about "Incompressible flow" patented technology

Tools for compacting composite parts are disclosed. These tools are used while layers of composite material, such as tows or laminae, are being deposited onto a fabricating surface, such as a mold or other forming tool. The compacting tool is typically divided into a series of narrow segments, each segment able to advance or retreat individually so as to conform to the surface of a composite part being formed. Pressurized fluid, such as air or hydraulic fluid, or non-pressurized internal bladders with incompressible fluid, are used to evenly apply pressure to the segments in order to compact the material with which the tool and the segments are in contact. The compacting tool thus helps eliminate voids and helps the material conform to the desired shape on the forming tool.

An implant for treating obstructive sleep apnea includes a first chamber containing an incompressible fluid, a second chamber containing a compressible fluid, and a flexible diaphragm separating the first and second chambers. The incompressible fluid is in communication with the compressible fluid via the flexible diaphragm. The first chamber has a first volume that remains constant in response to an external force applied upon the implant and the second chamber has a second volume that is changeable when the external force is applied upon the implant. The flexible diaphragm is extendible into the second chamber for reducing the second volume of the second chamber and compressing the compressible fluid within the second chamber. The compressible fluid within the second chamber provides less resistance to flexing during initial flexing of the implant and more resistance to flexing during further flexing of the implant.

A solenoid plunger (36) is disposed for reciprocation in a plunger pocket that is formed by the stationary parts of a solenoid-type actuator (10). A flexible diaphragm (22) closes the plunger pocket's open mouth and is deformed by movement of a plunger (36) between an open position, in which it is displaced from a valve seat (20), and a closed position, in which it is seated on the valve seat and thereby prevents flow from a valve inlet (16) to a valve outlet (18). The diaphragm thereby isolates the plunger from the fluid thereby being controlled, but a separate, incompressible fluid fills the chamber in which the plunger reciprocates. A through-plunger passage (44, 56) provides a low-flow-resistance path for the incompressible fluid to flow into and out of the portion (52) of the plunger chamber behind the plunger as the plunger moves. This reduces actuation time and thus the energy required for an actuation. The chamber in which the plunger reciprocates is formed by elements (22, 26, 32, and 34) through which the incompressible fluid can diffuse only very slowly, so the actuator can be long-lived even if it small in size.

A fluid pump for pumping a subject fluid. The fluid pump including, a pump body, a first cavity within the pump body, a second cavity within the pump body, a flexible member, an incompressible fluid, a subject fluid chamber, and a piston. Piston may include a piston head and an elongated piston shaft. The piston may be configured to amplify a first pressure experienced on a first side of the piston head and exerted by a pressurized drive fluid to a second pressure experienced on an end surface of the elongated piston shaft and exerted on the incompressible fluid within the flexible member. The subject fluid may in turn be pressurized to a third pressure substantially equal to the second pressure.

A dispensing apparatus has a motor drive that moves an output member along an axis in a first chamber. A shuttle valve controls flow between a first chamber and either a reservoir of material or an output port. Extending the output member discharges precise volumes of material through an output port. Retracting the output member fills the first chamber.

The invention belongs to the field of electric power systems and relates to a two-dimensional numerical simulation method for an icing process of a power transmission line. Based on the lagrangian method, the invention provides the two-dimensional numerical simulation method for a surface rime icing process of the power transmission line. A Reynolds-averaged Navier-Stokes (RANS) equation and shear-stress-transport-k-omega (SST-k-omega) turbulence model of non-steady incompressible flow is solved by adopting a semi-implicit method for pressure linked equations (SIMPLE) algorithm on a staggered grid so as to obtain an air flow field; movement tracks of super-cooled water droplets in the flow field are tracked by adopting the lagrangian method to obtain the transient local collision rate of all control volumes on the surface of the power transmission line; solving is performed based on an icing thermodynamic equation established by a Messinger control volume method so as to obtain the rime icing temperature of all the control volumes, and the icing process is simulated by combining an icing time marching method. Indicated by results, predicted ice shapes are better fitted with test measurement data in literature, and therefore, the two-dimensional numerical simulation method for the icing process of the power transmission line is feasible and effective.

The invention relates to a computational simulation method of a flow slide catastrophe of a rock and soil material, belonging to the technical fields of computational rock and soil mechanics, geologic hazard prevention and control and geologic environment protection. Aiming at the limitation that the conventional grid-based computing method is only suitable for small-deformation analysis, the invention discloses a computational simulation method of an entire flow slide catastrophe process of the rock and soil material based on smoothed particle hydrodynamics (SPH). According to the method, a Navier-strokes equation is used as a control equation, solid phase and liquid phase of the rock and soil material are described by using a sub-load face Cambridge model and an incompressible fluid constitutive model respectively, porous medium theory and darcy law are introduced to calculate solid-liquid coupling acting force, and a computation model, which considers the full coupling of water and soil, of the flow slide catastrophe of the rock and soil material, is established. According to the computational simulation method, the entire process of large-deformation flow damage of the rock and soil material can be effectively represented, and the fluidization characteristic of the rock and soil material is captured, so that powerful scientific basis is provided for engineering design, engineering construction, disaster prevention and reduction and the like of high-risk areas of the flow slide disaster, and meanwhile, application of the computational rock and soil mechanics in the technical fields of actual engineering construction, geologic hazard prevention and control and the like is forcefully promoted.

A speed limiting mechanisms for turbine-driven fluid distribution apparatus usable with compressible fluid such as compressed air and incompressible fluid such as water. Dynamic viscous damping of the turbine output power train is used to control the rotational speed of the turbine. This prevents overspeeding when the turbine is air driven, and also when the turbine is water driven, under abnormal conditions such as blockage of a bypass area designed to control the turbine speed by limiting flow to the turbine. The same mechanism can be used to impose a lower rotational speed in the turbine during normal operation in conjunction with a turbine optimized for lower speed operation to reduce the required gear reduction in the power train.

The invention provides a surgical electrocautery method and apparatus that achieves sealing along the entire tissue length, and that also is able to deliver adequate force to produce an effective electrocautery seal. This problem is solved by using an incompressible fluid contained in a sac or sacs positioned to support the one or more electrodes used for electrocauterization. The profile of the electrodes thus conforms to the tissue surface and thickness variations, while exerting an optimized pressure along the entire length of the surface.

The present disclosure provides a numerical simulation method for obtaining a flow field of an incompressible flow. The method comprises the steps: reading computational mesh information of a simulation object, physical property parameters of a fluid working medium and flow initial boundary value condition information, and calculating mesh parameters and time step parameters; initializing the velocity field and the pressure field; using m-step explicit Runge-Kutta to solve the momentum equation of incompressible fluid to obtain the virtual velocity field of the simulated object, where m represents the number of steps used and m>=2; based on the virtual velocity field and the read parameters and information, deducing the pressure equation from the continuity equation, and determining the next pressure by the pressure equation; when the last step of the m-step explicit Runge-Kutta is carried out, correcting the velocity field by the obtained pressure, and obtaining the next velocity; using the convergence criterion to judge whether the numerical solution is convergent or not, and if so, outputting the flow field data information, and if it is not convergent, repeating the iterative process until the numerical solution converges.

A fluid-filled vibration damping device including: a rubber elastic body interposed between and elastically connecting an inner shaft and an outer cylinder; a pair of fluid chambers having an non-compressible fluid sealed therein and formed facing on both sides, in the inner shaft axis-perpendicular direction; an orifice passage through which the pair of fluid chambers communicate with each other; a through hole formed through the inner shaft in the axis-perpendicular direction; and a movable rubber layer fluid-tightly closing the through hole and being exposed at opposite major surfaces thereof to the pair of fluid chambers, respectively so that pressure in the respective fluid chambers are exerted against the major surfaces of the movable rubber layer.

A power unit support structure adapted to provide vibration-damped support of an power unit of an automobile of FR longitudinal engine design on a vehicle body via engine mounts situated at two locations towards a vehicle front end and one location towards a vehicle back end, respectively. Of the engine mounts disposed at the three locations, a fluid-filled vibration-damping device exhibiting vibration-attenuating action based on flow action of non-compressible fluid filling the interior thereof is employed as a rear engine mount disposed at the vehicle back end, and the vibration-attenuating action based on the flow action of the non-compressible fluid is exhibited against vibration input in a vehicle longitudinal direction.