Abstract:
The invention relates to the use, in an acoustic transducer (1) of an ER fluid as the working fluid; to an acoustic transducer (1) using an ER fluid as its working fluid; to the use of an ER fluid as the working fluid of a vibrator; to a vibrator employing an ER fluid as its working fluid.
Abstract:
A device to provide buoyancy comprising a flexible envelope which can be attached to the object to be manipulated, a supply of gas sufficient to keep the envelope full at all times and a means whereby excess gas can escape.
Abstract:
A piston and cylinder viscometer suitable for investigating the rheological properties of Newtonian fluids and Bingham plastics. An undersized piston (18) is accelerated from rest down through a hollow cylinder (6) in a cylinder block (1) containing a fluid (7) under investigation, by the action of a piston rod (19) driven from above by a piston driving means (50). Both the instantaneous pressure ahead of the piston (18) and instantaneous velocity of the piston rod (19) are measured and recorded in phase to determine the relationship between shear stress and shear strain induced in the fluid (7) throughout the piston stroke.
Abstract:
A pressure-operated linear actuator uses Electro-Rheological (ER) fluid as the working liquid, with a single flow path between the inlet and outlet of the pump (5) and the pressures generated within two or more ER valves (11, 12, 13, 14) connected in series within this flow path are applied to two or more pistons (9, 10) acting in opposition.
Abstract:
A variable displacement pump (3) comprises a piston (4) reciprocable within a cylinder (2), a displaceable inlet valve (5) adapted to control admission of lower pressure hydraulic fluid (9) to the swept volume area (10) of the piston (4) and cylinder (2), a displaceable outlet valve (7) adapted to control delivery of higher pressure fluid (9) from the swept volume area (10), and means (13, 13A, 26-28, 29-44) to control the position of the inlet valve (5) so as to control the volume of fluid (9) delivered by the pump (3) in accordance with demand.
Abstract:
Fluides electrovisqueux (EV) se composant de particules hydrophiles solides dispersees dans des liquides hydrophobes, le liquide contenant un composant de derives de diaryle correspondant a la formule generale I: (FORMULE) dans laquelle R represente CY2, O, S, SO, SO2, SiF2, ou O-SiY2-O, Y1 et X2 sont des halogenes, (m + n) est compris entre 1 et 3 en moyenne, et (p + q) est compris entre 0 et 1 en moyenne. Les fluides EV contenant ces nouveaux composants possedent generalement des proprietes ameliorees en ce qui concerne les viscosites inferieures, les conductivites electriques, les toxicites et les points de congelation. Dans un mode de realisation preferentielle, le composant est un melange de diphenylmethanes bromes dans lequel R represente CH2, n = 0, X1 = Br, (m + n) est approximativement 1, et (p + q) = 0.
Abstract:
A pressure-operated linear actuator uses Electro-Rheological (ER) fluid as the working liquid, with a single flow path between the inlet and outlet of the pump (5) and the pressures generated within two or more ER valves (11, 12, 13, 14) connected in series within this flow path are applied to two or more pistons (9, 10) acting in opposition. 00000
Abstract:
A twin-hulled (1) boat comprises two parallel, relatively narrow and relatively long hulls (2) interconnected by a central bridge section (3) and each hull (2) having a bow section (4) and a stern section (5), characterised in that the hulls (2) have virtually flat-bottoms (6) apart from the bow sections (4).
Abstract:
A flexible envelope, of fabric, plastic sheet or similar material, is made buyoant by being filled with water of lower salinity than the surrounding medium, and used to lift loads underwater. The lift can be generated in situ by pumping water into the envelope after it has been attached to the load through a hose from the surface , and reduced by either releasing the water from within the envelope or pumping it back to the surface again. By combining these two operations, the lift can be exactly controlled. Several envelopes can be used to lift a single load, and the load itself can be made up of small objects placed in a suitable container by other means. The envelopes may be towed into position, or may be provided with their own means of propulsion.