Abstract:
To prevent propeller overshoot, a propeller governor control (18, 20, 34) modifies a speed command issued to the speed setpoint actuator of a propeller governor. The control (34) establishes a false setpoint that causes the propeller governor to change pitch before the propeller reaches the speed ordered by the speed command. The propeller governor control (20) also compensates for small calibration errors in the propeller governor.
Abstract:
The process for rectification of phenol, said phenol prepared from crude phenol being the product of decomposition of cumene hydroperoxide and having previously been distilled to remove large portions of acetone, cumene and alpha methylstyrene, comprising withdrawing the overhead vapors from the column overhead and feeding said overhead vapors to a condenser, thereby condensing a major portion of said vapors; withdrawing a small portion of said overhead vapors from said condenser while still in a vapor state, said small portion being relatively enriched in lights and laden with light acids; returning the condensate from said condenser to the phenol distillation column as reflux; and withdrawing product phenol from at least one theoretical stage below the top of the phenol distillation column, said product phenol having improved clarity when dispersed in water, said clarity being at least 93 percent light transmission as measured by an electrophotometer in a water light test. It is preferred that the condenser in step (c) is a steam generating condenser, thereby condensing a major portion of said vapors while vaporizing water circulating through the steam generating condenser to produce steam.
Abstract:
The brake piston adjuster mechanism includes an expandable or deformable tube (80) which is attached to the piston (60) and engaged by a deforming member comprising a pin (190) having a threaded end (194) receiving thereon a nut (193) and tube expander (192). The nut (193) biases the tube expander (192) against a chamfered pin shoulder (191). The tube expander (192) has at least one inner diameter chamfer (198) which engages the chamfered pin shoulder (191) in order to impose preload forces upon the chamfered pin shoulder (191) and reduce stresses at smaller diameter portion (195) of the pin. The nut (193) may be a castellated nut (193) which receives a locking wire or pin (200) extending through an opening (199) in the threaded end (194) of the pin (190). Alternatively, the tube expander and nut may comprise a one-piece expander nut (293, 393, 493) having an enlarged radially extending end portion (294, 394, 494) and the nut (293, 393, 493), when advanced along the threads of the pin (190), causes a chamfer (298, 398, 498) of the end portion (294, 394, 494) to advance along the chamfered pin shoulder (191) and cause the end portion (294, 394, 494) to deform elastically, improving the preload retention of the connection.
Abstract:
A process for shaping parts from ceramic powder that comprises the steps of (1) forming a concentrated mixture in excess of 40 % ceramic solids by volume, the mixture comprising ceramic powder, a gel forming material chosen from the class of polysaccharides known as 'agaroids', and a gel forming material solvent and being formed in a blender that provides a shearing action and is heated to raise the temperature of the mixture to about 70 to 100 °C; and (2) molding the mixture at a temperature sufficient to produce a self-supporting structure comprising the powder and gel. The parts exhibit excellent green strength and are rapidly fired without cracking, distortion or shrinkage problems.
Abstract:
An apparatus to be employed within a precision distance measuring system for estimating pulse time-of-arrival. The apparatus facilitates the use of an Adaptative Fixed Threshold method for such estimation. The invention compensates for pulse time detection errors induced by variations in incident pulse amplitude and shape by adjusting the estimated time-of-arrival. This adjustment is performed as a function of the measured pulse slope between two low-amplitude threshold levels through the use of a predetermined reference table of error adjustment times.
Abstract:
In a valve having a housing with a cavity therein with an entrance port connected to a source of fluid and an outlet port connected to a fluid system. The valve has a body with first and second poppet members which control the flow of fluid from the entrance port to the outlet port. An actuation member connected to the body moves the first and second poppets with respect to first and second seats, respectively, to control the flow of fluid from the entrance port to the cavity and correspondingly the flow of fluid to the outlet port. The actuation member sequentially moves the first and second poppets toward the first and second seats, respectively, by initially moving the second poppet into engagement with the second face to partially interrupt the flow of fluid through cavity and thereafter moving the first poppet into engagement with the first face to completely interrupt the flow of fluid through the cavity to the outlet port. The first and second seats each have a cylindrical member located in said cavity with a first end having a flange and a conical surface thereon and a second end that engages the housing, the conical surface defining the contact for the seating of the corresponding first and second poppets on the body. A flexible member located in grooves in the housing engages the cylindrical members of the first and second seats and a locking ring attached to the housing retains the cylindrical members in the housing while compressing the flexible member to form seals between the cylindrical members and the housing. The flexible member allows some dimensional changes to occur in the housing without effecting the sealing to assure that the flow of fluid through the cavity to the outlet port is interrupted when the first and second poppets engage said first and second seats.
Abstract:
Silica microsphere having a mean diameter in the range of about 0.1 to 10 νm are provided with a thin surface layer, often a monolayer, of a metal to provide the appearance of a solid particle of the metal as its oxide. The microspheres are contacted with an aqueous or alcoholic solution of a metal compound to deposit the surface layer.
Abstract:
A rapidly solidified brazing alloy consists essentially of about 14 to 45 weight percent magnesium and 0 to 10 weight percent of at least one element selected from the group consisting of silicon, bismuth, strontium, lithium, copper, calcium, zinc and tin, the balance being aluminum and incidental impurities. The alloy has the form of a foil (liquidus temperature
Abstract:
A system and method of controlling the operation of a brake such as a drum brake (20) in either a parking or service braking mode of operation. A cable (50) is attached to one end of a brake shoe and the tension in the cable is varied under control of a motor (60) and associated gear device (62) to produce a desired brake torque responsive to a signal indicative of operator applied brake activity during service brake operation. To operate as a parking brake the motor is controlled to produce a determinable tension in the cable to lock the brake.
Abstract:
The disc brake (10, 106, 108, 206) with powered integral parking mechanism comprises a twin piston disc brake (106, 108, 206) having a screw member (22, 24; 122, 124; 222, 224) and nut (28, 29; 228, 229) adjuster mechanism. The twin pistons (16, 18; 216, 218) receive service braking hydraulic pressure to effect a service braking application, and also may be displaced mechanically for a parking application by way of the rack (80, 280) and pinion (47, 48; 247, 248) parking mechanism that is operated by hydraulic pressure. The rack (80, 280) and pinion (47, 48; 247, 248) parking mechanism may be located within the caliper housing (20, 220) such that the rack (80) extends between respective drive pinions (47, 48) located about the screw members (22, 24) in order to effect rotation of the screw members (22, 24) in opposite directions, or the rack (280) may extend longitudinally across the same side of both drive pinions (247, 248) to effect rotation of the drive pinions (247, 248) and associated screw members (222, 224) in the same direction of rotation. The drive pinions (47, 48; 247, 248) have ratchet teeth (49) which engage corresponding ratchet teeth (39) on screw member flanges (32, 34) such that during release the height (B) of a flange ratchet tooth (39) determines the running clearance of the disc brake pads.