Abstract: A resiliently suspended mass varies the resistance of a pair of ohmic resors located in a magnetic field by changing the magnetic field by changing position in response to acceleration. The mass may be made of soft iron or contain a magnet to affect the change in the magnetic field.

Abstract: A damping mechanism for a two-degree-of-freedom rate gyroscope of the flexible disk type includes a pair of auxiliary disks, one mounted closely adjacent each side of the rotor disk to provide squeeze film type damping of any axial vibrations of the rotor at the resonant frequencies of the flexible rotor.

Abstract: An accelerometer comprising a member of silicon subjected to physical changes in response to the linear accelerations, elements integrated into the surface of the member for generating, amplifying and supplying an output determined by those changes, and means responsive to said output for overcoming said physical changes.

Abstract: In a gravimeter the measuring mass is supported by springs which are arranged in regular array around the measuring mass and exert pressing forces on the measuring mass along lines of action extending at an angle to the horizontal. The state of equilibrium with a predetermined value of the acceleration due to gravity coincides with an extreme value of the force-versus-deviation characteristic of the spring system, whereby the measuring mass is held practically free from restoring forces by the spring system. A sensor detects deviations from a zero position and controls a restoring force generator. Two counter-acting sets of springs are provided. The springs are tension springs, the tensional force of which acts on the measuring mass as a pressing force through a lever transmission. A measuring range spring permits setting of measuring ranges. An advantageous construction therefor is described.

Abstract: A knocking sensor comprises a casing for receiving a pickup assembly including a transducer, which produces an electrical signal in accordance with engine vibrations, and a connector having at least a single pin electrically connected to the transducer. The casing comprises a threaded projection to be screwed in a screw hole of an engine, and a nut-like periphery to be rotated by a tool. The knocking sensor can be attached to the engine by means of an impact wrench, by rotating the nut-like portion. A plug connected to one end of a shielding code can be plugged in the connector to make an electrical connection between the transducer and a signal processing circuit after the knocking sensor has been attached to the engine, and therefore, the shielding code is prevented from being damaged during installation of the knocking sensor. The use of an impact wrench ensures secure attachment of the sensor, and reduces the installation time.

Abstract: A jogger speedometer and odometer device adapted to travel over a surface while secured to a jogger's body, is provided and consists of a wheel rotateably connected by a shaft between the bifurcations of a forked. The wheel is mechanically connected to an indicator unit attached to a handle that is attached to a flexible shaft. The wheel activates the indicator unit through the flexible shaft in accordance with the relative movement between the wheel and the surface.

Abstract: A procedure and a device are provided for determining the correlation between the unbalance of a rotor in at least one correction plane thereof and the measurement signal generated by such unbalance at one or more of the rotor supports. The vibration signals of the rotor are measured at different bearing support stiffness.

Abstract: The present invention employs a material mass to respond to forces, such as gravity, and the material mass is secured through an intermediate beam, or arm, to a wire coil. The intermediate arm has upper and lower shafts secured thereto, which, when mounted in some form of bearing means, permit the arm, or beam, to rotate, thereby rotating the mass and the wire coil, in response to forces applied to the material mass and forces applied to the wire coil. The coil is formed to pass through a narrow gap between a pair of permanent magnets whereby the coil is subjected to a high density magnetic flux.

Abstract: A method and a device for balancing circular plate-shaped objects, in which the object is centered on means which are movable against spring force. The object is then clamped against a rotatable part which is rotated at a given speed. The object is then released, whereupon it undergoes a deviation from the axis of rotation which is proportional to the unbalance. Subsequently, the object is clamped again and the outer edge is turned to remove the unbalance.

Abstract: A method is provided for selecting the optimum concentration of inhibitors such as soluble salts to effect maximum clay swelling and dispersion inhibition in an aqueous fluid of water-swellable, argillaceous materials including clays as exemplified by bentonite and argillaceous sediments, such as shales, encountered in drilling operations. In this method filtration measurements are first taken to develop a filtration parameter from which the optimum inhibitor concentration is readily determined.

Abstract: An engine vibration sensor for detecting the engine vibration as an electric signal including a vibrator set to resonate at a specific frequency of vibration of an engine to which it is attached, the vibrator being composed of at least one piezoelectric plate and having a root and a vibrator element; means for increasing the cross-sectional area of the vibrator element to make the second moment of area of the root of the vibrator relatively larger than that of the vibrator element; a base to be connected to an engine body; and a clamp for retaining the root firmly between the clamp and the base. The clamp may be provided with a projection having a flat surface for retaining the root of the vibrator. This construction prevents a change in the effective length of the vibrator element, thereby stabilizing the characteristics of the resonant frequency of the vibrator.

Abstract: Methods and apparatus are disclosed for monitoring and controlling potential residual stress relief mechanisms in composite epoxy resin materials. Passive and injected, or active, acoustic signals originating in or propagated through a specimen material during the formation process produce signatures identifiable with known residual stress relief mechanisms. Real-time control of material temperature and external pressure during formation in response to acoustic signals measured or observed in relation to desired acoustic signature minimizes formation of undesired material properties.

Abstract: To sense pressure within the combustion chamber of an internal combustion engine (ICE), a plug element which already extends into the combustion chamber of the ICE, such as a sparkplug, or a glow plug, has a layer-like resistor applied to a ceramic insulator extending into the combustion chamber, for example, directly on the central insulator of a sparkplug or on the side of a ceramic glow plug bushing or plug element. If applied to a sparkplug then, preferably, the heater is shielded by metallic layers, separated from the metallic shielding layers by insulating layers, of which the top metallic layer preferably is platinum or a platinum-type metal to catalyze combustion of residues which, otherwise, might collect on the top layer and interfere with proper sensor operation. The layer-like sensor and conductive tracks may be of thick film construction; stamp-on printing with flexible printing stamps is suitable to apply the layer-like resistors.

Abstract: A dynamic balancing machine having a rotatably driven mounting shaft for articles to be balanced has a fixture upon which known weights are mounted at two known calibration planes ralative to the shaft. Data taken by force sensors coupled to the shaft during two shaft spins with the known weights mounted in each calibration plane are used to calculate sensor output correction factors applied to unbalance data taken during the spin of a mounted unbalanced article for a pair of unbalance measurement planes spaced along the shaft. The unbalance calibration and measurement planes are axially displaced along the shaft from the location of the force sensors. The disclosure is directed toward apparatus and method for obtaining machine calibration.

Abstract: A fault indicator for indicating the occurrence of a fault current in a power distribution system includes a rotatably mounted indicator flag. The indicator flag is actuated through successive 90.degree. trip and reset positions by a compact magnetic pole piece assembly having four radially extending magnetic pole segments which interact with four similarly aligned magnetic poles on the indicator flag. A pair of bidirectional windings on two of the pole segments magnetizes the pole segments to rotate the flag between successive trip and reset positions. Extensions on the two pole segments along the circumference of the indicator flag provide for positive rotation of the flag in a predetermined direction.

Abstract: An optical sensing system for detecting a physical parameter such as acceleration, temperature or pressure through parameter induced motion of an optical element in a fiber optic path. The motion of the optical element varies the light transmission through the path in which the optical element defines the relationship between motion and alteration in light transmission. In one embodiment the optical element includes a focusing system between an input and an output optical fiber to result in an increase in sensitivity by enhancement of the effect of motion of the optical element of the amount of light transmitted to the output fiber. The optical element may include or be attached to a mass to provide acceleration sensitivity for use in geophysical exploration. In addition, the optical element can be adapted to provide acceleration sensitivity in one direction in combination with insensitivity to acceleration in an orthogonal direction of particular use in such geophysical exploration.

Abstract: A random vibrations testing device comprising a noise generator the output whereof is connected to an input of a wide-band filter. An output of the wide-band filter is connected directly and through paralleled narrow-band in-phase signal shaping channels to a means for shaping dips and spikes in the spectrum of a signal being shaped, which is electrically coupled with narrow-band opposite-phase signal shaping channels. The means for shaping the spikes and dips in the shaped signal spectrum is devised in the form of an adder series-connected to the wide-band filter, used commonly by all the narrow-band in-phase signal shaping channels and serving to form spikes in the shaped signal spectrum, and adders also series-connected to said wide-band filter, used individually by each opposite-phase narrow-band signal shaping channel and serving to form dips in the shaped signal spectrum.

Abstract: The disclosure describes a control system in a test device for testing a manual speed change unit, for vehicle, provided with an input shaft driving means for forcibly driving the input shaft of said manual speed change unit and a clutch placed between the input shaft driving means and the input shaft. Reference data are taken from the revolution speed of said input shaft resulted by changing the speed of said manual speed change unit by operating change of a gear shift while rendering said clutch in a disconnected state, to control the revolution speed of said input shaft driving means and said clutch is brought into a connected state when the revolution speed of said input shaft is synchronized with the revolution of said input shaft driving means.

Abstract: A knocking detection apparatus for multi-cylinder engines, capable of detecting knocking through sensing pressure pulsation propagating through the cooling water flowing in a cylinder block surrounding the cylinders. The knocking detection apparatus has a diaphragm facing the space downstream from the detection apparatus as viewed in the direction of flow of the cooling water, and a transducer dixed to the diaphragm.

Abstract: A dynamic combustion characteristic sensor suitable for the detection of the timing of peak combustion pressure or the occurrence of knock in an internal combustion engine comprises an engine headbolt having a piezoelectric disc affixed to the surface of the bolt head. An insulator holds an inner terminal electrically connected to the upper side of the piezoelectric disc and is held by its lower periphery, along with a surrounding electrically conducting outer terminal by a vertical annular wall rising from the surface of the bolt head. The annular wall and outer terminal provide electrostatic shielding and a ground reference for the inner terminal, which is connected electrically by a shielded connector to a charge amplifier with a double pole high pass filter with a half power frequency of 0.5-1.0 Hertz to block signals generated by thermal strains in the engine.