Abstract: An improved procedure for collecting experimental data reflecting the behavior of a time varying aerodynamic parameter at an airfoil in a cascade of airfoils vibrating harmonically in a fluid stream including the steps of vibrating the center airfoil of the cascade at a selected frequency and amplitude while each of the other airfoils is held rigid, measuring the time varying parameter at the center airfoil and expressing it as a function of the position of the center airfoil in its vibratory cycle, vibrating each of the other airfoils in turn at the selected frequency and any amplitude while maintaining all the remaining airfoils rigid, measuring the time varying parameter at the center airfoil for each individual airfoil vibration and expressing the measurement as a function of the position of the individual vibrating airfoil, expressing the position of each individual vibrating airfoil as a function of the position of the center airfoil, and combining the time varying parameter expressions and position exp

Abstract: A water tank assembly for a pressure resistance measuring apparatus for testing containers comprises a vertical water tank, an auxiliary water tank connected with the vertical water tank at an upper end portion of the vertical tank wherein the vertical tank has a smaller diameter than that of the auxiliary water tank, a cover attached to the vertical water tank, a nozzle assembly connected to the cover wherein a container to be tested is fixed to the lower end of the nozzle assembly, an opening end portion of the vertical water tank protruding into the auxiliary water tank, and wherein the vertical water tank and the auxiliary water tank store water and the water level of the auxiliary water tank is above the upper end portion of the vertical water tank.

Abstract: Method and apparatus for use in balancing the blades of ceiling fans, wherein the pitch angles of the blades and the dihedral angles of the blades are measured and corrected, if necessary, by use of a beam of light reflected from a mirror temporarily flushly affixed to each blade, and wherein indexes are provided for measuring and correcting, if necessary, the circular angularities between the blades. Blades may be tested both individually or in sets connected to a hub.

Abstract: A dual wavelength spectrophotometer for ampoule content inspection, in particular for ampoule leak detection wherein leaks are initially "flagged" via the dye bath immersion technique. Light transmitted through the ampoule is received by a bifurcated fiber optic cable providing via a random mix arrangement substantially identical ampoule optical signature signals. Each is directed through preselected interference filters, chosen on the one hand on the basis of the dye being used and the glass ampoule and its contents on the other hand. Associated with the filters are respective photodetectors, the output signals of which are connected to a difference amplifier stage. The output (if any) of the latter is compared to a preestablished (dye) threshold signal, which represents the minimum level (of dye) from which to effect a reject status. The ampoule contents or a particular component thereof may also be investigated in this manner.

Abstract: An apparatus for testing leaks comprises a steeping bath, a boiling bath at one side of the steeping bath, a water separating bath at the other opposite side of the steeping bath and an overhead vapor bath covering those baths which has a cooling device for condensing a fluorocarbon vapor over the separating bath; the so-condensed liquid fluorocarbon drops into the steeping bath for testing an air tightness of sealed containers, boxes or the likes having an internal pressure, wherein the liquid fluorocarbon overflowing from the steeping bath into the boiling bath is boiled therein for circulation and purification of said liquid.

Abstract: A device for testing an elongated elastic sleeve or balloon. The device has a pair of clamp members which selectively grip opposed ends of the sleeve, and the device inflates the sleeve while retained by the clamp members. The device illuminates the inflated sleeve walls from the inside of the sleeve to permit visual inspection of the sleeve walls. The device also permits rotation of the clamp members and retained sleeve to permit visual inspection of the inflated sleeve walls circumferentially around the sleeve. The device permits submersion of the inflated sleeve into a testing liquid in order to determine whether the sleeve walls leak.

Abstract: A method for leak-testing synthetic separators for interleaved planar electrodes is described. The method includes installing the separator such as a diaphragm or membrane about the electrodes to create an enclosed chamber within the separator, supporting the electrodes from a supportive cell housing, pressurizing the created chamber to a predetermined pressure with a gas, slowly filling the housing with a liquid to a level above the separator and observing the separator during the filling operation to determine if leaks are present in the separator.

Abstract: Vibration of a bladed rotor is reduced by a method that includes:(a) rotating the rotor at a selected power level, at which vibration is produced,(b) detecting an out-of-track condition of a blade being rotated at that power level.

Abstract: A rotating mechanism such as a model aircraft propeller shaft is balanced by a dynamic balancing apparatus comprising a disc rotating with the shaft and a stainless steel O-ring partly filled with mercury lodged in an undercut groove in the face of the disc. The method of manufacture involves placing the ring in the groove and compressing the ring to expand it radially into the undercut area.

Abstract: Apparatus for testing pressurized sealed containers for leakage including a fluid filled tank for receiving the container to be tested. The tank is comprised of a transparent side wall, a bottom wall and a top wall. Means are provided for piercing the container to be tested. Means are further provided for attachment to the piercing means for providing communication between the interior of the container and a source of pressure fluid operable to pressurize the container being tested only when the top wall of the tank is in a closed position.

Abstract: The output of an aircraft propulsion or lift rotor blade out-of-track pick-up is processed in such a way as to enable quick determination of need for blade pitch adjustment, the approximate amount of such adjustment to optimize reduction of out-of-track vibration, and the need for blade substitution when such optimized reduction is insufficient.

Abstract: A method and apparatus for testing the pressure venting characteristics of canning jar lids. A pressure chamber in the form of a mock jar finish has a canning jar lid fastened to it in the manner which the lid will be fastened under actual canning conditions. The chamber and the lid are then placed in a liquid bath which reproduces temperature conditions present during canning, and the chamber and the lid are allowed to stand in the bath until they come to the temperature of the bath. The chamber is then pressurized, and the pressure monitored until the canning jar lid is observed to vent gas; bubbles in the liquid in the bath indicating that venting is occurring. This pressure is then noted and serves as a measure of venting characteristics of the jar lid. Also disclosed is an apparatus for practicing the method.

Abstract: A turbine blade indexing assembly adapted for variably adjusting the pitch of the turbine blades in a turbine wheel. The indexing assembly includes a housing secured to a turbine hub and an indexing ring contained between the housing and the hub and adapted for limited rotational movement relative to the housing. A plurality of radial bores are formed around the periphery of the housing and each bore is adapted to receive a cylindrical shank of the turbine blade therethrough. A blade retainer ring, having a transverse bore adapted to register with a transverse bore formed through the turbine blade shank, is positioned on each turbine blade shank so that a pin member inserted through the registering bores in the shank and retainer ring rotatably secures the turbine blade to the housing. One end of the pin member is received in an actuator slot formed in the indexing ring so that rotational movement of the indexing ring produces a corresponding axial rotation of the turbine blades.

Abstract: A method and apparatus are provided for the inspection of nuclear fuel rods to detect defects or failures in such rods. Assemblies of fuel rods are immersed in water and means are provided for causing a change in the relative pressures in the water and within the fuel rod such that material is expelled from the rod through any defects that may exist. Means are provided for detecting the emission of bubbles, or other material expelled from the rod, and for locating the position of the defective rod in the assembly. The method is also applicable to detection of contaminants in new fuel rods which may result in the development of defects in the rod.

Abstract: Vibration in the helicopter fuselage produced through the helicopter rotor at a frequency of one for each rotation of the rotor (commonly identified in the art as a one-per-rev vibration) is controlled by applying a correction signal to the primary cyclic control system of the rotor assembly. To generate the correction signal, a transducer responds to the one-per-rev vibrations to generate a signal coupled to circuitry for generating a vibration related signal dependent upon the amplitude and phase of the one-per-rev vibrations. The vibration related signal is applied to a sample and store network wherein it is demodulated by a reference signal related to the rotational speed of the helicopter to establish a control voltage which varies at a rate in dependence upon variation in the maximum amplitude of the one-per-rev vibrations. This control voltage is integrated and modulated by the reference signal thereby resulting in the correction signal for application to the primary cyclic control system.

Abstract: A helicopter rotor blade having at least one ramp tab of selected span and chord dimensions, weight and shaped to define an outer surface of selected angularity with respect to the blade chord and being selectively positioned along the blade trailing edge and bonded to its upper or lower surface so as to be totally within the blade chord profile and be effective to eliminate or reduce to within acceptable limits blade pitching moment dynamic unbalance.

Abstract: An improved aerosol can testing apparatus including an endless belt carrying a plurality of can suspending members on either side, the aerosol cans being suspended vertically by a spring load plastic finger assembly, and with further automatic can discharge means.

Abstract: The method of balancing a rotor having multiple blades and defining an axis of rotation, and wherein structure proximate the rotor is subject to vibratory motion due to dynamic unbalance of the rotating rotor and an out-of-track condition of the rotor blades, the method employing two vibration pickups, the method including:A. operating the pickups to produce vibratory signals corresponding to up and down vibratory motion of the structure at port and starboard sides of said axis,B. combining said signals to produce a resultant oscillatory output signal characteristic of rotor vibratory motion due substantially to only one of said conditions,C. using said resultant output signal to alleviate said one condition.