Showing papers on "Damper published in 1969"
TL;DR: In this article, the exact solution for the symmetric two impacts/particle/cycle motion of an n-unit impact damper attached to a sinusoidally excited primary system is derived analytically, and its asymptotically stable regions are determined.
Abstract: The exact solution for the symmetric two impacts/particle/cycle motion of an n‐unit impact damper attached to a sinusoidally excited primary system is derived analytically, and its asymptotically stable regions are determined. Simulated motion on a digital computer and experimental studies with a mechanical model are presented, and they show good agreement with theoretical results. It is found that properly designed multiple‐unit impact dampers are more efficient than equivalent single‐unit impact dampers in regard to vibration reduction and noise level of operating units.
77 citations
TL;DR: In this article, the authors analyzed the dynamic characteristics of the self-damped air spring on the basis of the linear theory from the standpoint of the design of air suspension bogies.
Abstract: In this paper, at first the authors analyze the dynamic characteristics of the self-damped air spring on the basis of the linear theory from the standpoint of the design of air suspension bogies. The equivalent mechanical model of the self-damped air spring is obtained, which is a kind of socalled elastically supported damper systems, and the relationship among the elements of the model and the design parameters of the air spring are given. Then, using the mechanical model, both natural vibration and transient response of the air suspension bogie are analyzed numerically. As the result, it is shown that the natural frequency and the damping ratio of the self-damped air suspension bogie scarcely vary with the car body weight, and the self-damped air suspension can reduce the magnitude of the transient response compared with a conventional mechanical suspension with oil-dampers.
47 citations
Patent•
27 Jun 1969
TL;DR: In this article, the authors describe a system for a VARIABLE NATURAL FREQUENCY MACHINE TOOL MEMBER where a series or multiple sets of independent DAMPERS are arranged so that there is an effective DAMPing of a member over a range of USABLE FREQUENCY RANGE.
Abstract: A SERIS BIBRATION DAMPER UNIT FOR A VARIABLE NATURAL FREQUENCY MACHINE TOOL MEMBER WHEREIN A SERIES OR SEVERAL TANDEM SETS OF INDIVIDUAL DAMPERS, EACH COMPRISING A DAMPING MASS EFFECTIVELY SUPPORTED BY TWO VISCOELASTIC ABSORBER ELEMENTS, ARE ARRANGED SO THAT THERE IS EFFECTIVE DAMPING OF SAID MEMBER OVER THE USABLE FREQUENCY RANGE OF SAID VARIABLE NUTURAL FREQUENCY MEMBER.
39 citations
Patent•
04 Jun 1969
TL;DR: An automatic damper for use in the exhaust flue of combustion devices such as furnaces and the like to prevent undesirable loss of hot or cold air out the flue during periods when no combustion is taking place as discussed by the authors.
Abstract: An automatic damper for use in the exhaust flue of combustion devices such as furnaces and the like to prevent undesirable loss of hot or cold air out the flue during periods when no combustion is taking place and to assure that no combustion can take place unless and until the flue is open or unrestricted. The damper has a rotatable damper plate normally biased to a closed position for preventing flow communication through the flue, motor means which when energized move the damper plate to an alternate open position to allow substantially unrestricted communication through the flue, and switch means connected in a circuit with the means that supply fuel to the combustion means, said switch means being closed when the damper plate moves to its open position to enable a combustion cycle to take place.
27 citations
Patent•
24 Jul 1969
TL;DR: In this article, dampers in the air inlet of a ventilation system for a relatively closed room or building are adjustably positioned by a reversible electric motor controlled so that although the velocity at which air is exhausted from the building may vary, the dampers regulate the inflow of air to provide a substantially constant pressure differential between the interior and exterior of the building.
Abstract: Dampers in the air inlet of a ventilation system for a relatively closed room or building are adjustably positioned by a reversible electric motor controlled so that although the velocity at which air is exhausted from the building may vary, the dampers regulate the inflow of air to provide a substantially constant pressure differential between the interior and exterior of the building.
24 citations
TL;DR: In this paper, the Damper-bar currents of a synchronous machine induced during transient asynchronous operation are studied and the results of calculations and measurements are presented and compared, both for the synchronous machines with a squirrel cage and with a grill (open end rings).
Abstract: Damper-bar currents of a synchronous machine induced during transient asynchronous operation are studied in this paper. Experimental and mathematical methods are used in analyzing an actual synchronous machine. Results of calculations and measurements are presented and compared. All analyses are carried out both for the synchronous machine with a squirrel cage and with a grill (open end rings).
23 citations
Patent•
08 Jan 1969
TL;DR: In this paper, the authors discuss the effect of a VIRBRATION DAMPER on a VISCOUS DAMPING FLuid in a SHEAR FILM COUPLING BETWEEN MEMBERS.
Abstract: A VIRBRATION DAMPER HAS MEANS FOR ATTACHING IT TO A STRUCTURE SUBJECT TO VIBRATIONS, I.E., A CRANKSHAFT, AND COMPRISING RELATIVELY MOVABLE MEMBERS ONE OF WHICH IS AN INERTIA MASS AND ONE OF WHICH DEFINES A HOUSING RELATIVE TO THE OTHER MEMBER TO RETAIN A VISCOUS DAMPING FLUID IN A SHEAR FILM COUPLING BETWEEN THE MEMBERS, ELASTOMERIC TUNING SPRING BEARING MEANS UNDER PRECOMPRESSION BETWEEN AND FRICTIONALLY ENGAGING WITH THE MEMBERS FUNCTIONING TO EFFECT TUNING AND DAMPING BY RESILIENT FLEXING SPRING ACTION FO THE BEARING MEANS IN ADDITION TO VISCOUS SHEAR DAMPING BY SAID VISCOUS FLUID AND TO ENABLE GUIDED STRESS RELIEF SAFETY RELATIVE SLIDING DISPLACEMENT OF THE MEMBERS ON THE BEARING MEANS, WHILE CONSTANTLY MAINTAINING THE SHEAR FILM SPACED RELATION BETWEEN THE MEMBER. EFFICIENT TUNING AND SHEAR DAMPING BY A VISCOELASTIC MATERIAL IS ENABLED.
21 citations
Patent•
21 Aug 1969
TL;DR: A rotary damper having rotor and spacer plates with relatively close spacing there between and a viscous fluid to provide a fluid coupling between the rotor and stator plates and a combination with the damper connected to damp the movement of the valve member of a swing check valve is described in this article.
Abstract: A rotary damper having rotor and spacer plates with relatively close spacing therebetween and a viscous fluid to provide a fluid coupling between the rotor and stator plates and a combination with the damper connected to damp the movement of the valve member of a swing check valve.
20 citations
Patent•
03 Mar 1969
TL;DR: In this paper, a controlled volume air terminal outlet for use at a room discharge of an air distribution system for a building is described. But the terminal outlet includes a first damper section which is thermostatically controlled for throttling air passing therethrough and a second damper part which is manually or otherwise controlled.
Abstract: This disclosure is directed to a controlled volume air terminal outlet for use at a room discharge of an air distribution system for a building. The terminal outlet includes a first damper section which is thermostatically controlled for throttling air passing therethrough and a second damper section which is manually or otherwise controlled. Discharge through the terminal outlets passes through a diffuser for air pattern control. A pressure and temperature branch control is also disclosed.
17 citations
TL;DR: In this article, the effects of the control parameters on the damping characteristics of synchronous machines were analyzed for a one-field and two-field machine connected through a line impedance to an infinite bus.
Abstract: Damping of synchronous machines by means of rapid response excitation control is analyzed for a one-field and two-field machine connected through a line impedance to an infinite bus. Emphasis is placed on the influence of the control parameters upon the damping characteristics of a conventional one-field machine. Regions of instability which may occur due to improper controller design or adjustment are established. Optimization of controller parameters and the effect of controller compensation are considered. Also, the damping characteristics of a two-field machine are presented and compared with those of a one-field machine. The application of the two-field machine to damp frequency oscillations in power systems has the potential of being of practical importance. Damping by excitation control ("forced" damping) is compared to damping due to the action of damper windings. The advantages of forced damping are clearly established; particularly in systems where long line lengths exist between large generating units.
Patent•
08 Jan 1969TL;DR: In this article, a vehicle suspension device in which the spring and damper are connected to the body of the vehicle by different elastically yieldable connecting means is described, such that the damper is connected with the body less rigidly than the spring.
Abstract: Vehicle suspension device in which the spring and damper are connected to the body of the vehicle by different elastically yieldable connecting means The arrangement is such that the damper is connected to the body less rigidly than the spring
Patent•
13 Feb 1969
TL;DR: In this paper, a temperature compensating damper structure adapted to be used to control flow of fluid and subject to extreme temperature changes in which the structure comprises a fluid control damper means such as a plurality of dampers mounted in a frame and movable between open and closed position.
Abstract: A temperature compensating damper structure adapted to be used to control flow of fluid and subject to extreme temperature changes in which the structure comprises a fluid control damper means such as a plurality of dampers mounted in a frame and movable between open and closed position, stop means against which the damper means bear when in the closed position and yieldable operating means such as springs for moving the damper means to this closed position, the yieldable operating means having a path of travel extending beyond the corresponding closed position of the damper structure against the stop means regardless of expansion and contraction of the damper structure parts during temperature changes therein.
Patent•
26 Aug 1969
TL;DR: In this paper, a vibration damper of the type having relatively movable parts with spaced confronting surfaces disposed to move in parallel relation during movement of the parts is provided with reinforced viscoelastic material in the space between the parts in engagement with the surfaces and shearingly resisting the relative movement.
Abstract: A vibration damper of the type having relatively movable parts with spaced confronting surfaces disposed to move in parallel relation during movement of the parts is provided with reinforced viscoelastic material in the space between the parts in engagement with the surfaces and shearingly resisting the relative movement.
Patent•
06 Oct 1969
TL;DR: In this article, dampers are adjusted to fully enclose the heat exchange surfaces to reduce the heating effect without reducing the flow of heat exchange medium, thereby eliminating the risk of damage to the coil from freezing.
Abstract: Apparatus for heating outside air having dampers which can be adjusted to fully enclose the heat exchange surfaces to reduce the heating effect without reducing the flow of heat exchange medium. The risk of damage to the coil from freezing is thereby eliminated.
Patent•
08 May 1969
TL;DR: An air damper ventilator combines a fixed blade ventilators with means adaptable to check the flow of air in a plurality of directions or regulate the flow as it passes therethrough.
Abstract: An air damper ventilator combines a fixed blade ventilator with means adaptable to check the flow of air in a plurality of directions or regulate the flow of air as it passes therethrough.
Patent•
27 Jan 1969
TL;DR: In this paper, the authors present an air distribution system wherein polluted air is withdrawn and fresh replenishing air is brought into the system, desirably with heat exchange and temperature adjustment to that of a conditioned space, and is distributed alternately as an air screen over any open doorway or conveyor opening and when the doorway or opening is closed, the fresh air flow is shifted by damper means to a central distribution point.
Abstract: Air distribution system wherein polluted air is withdrawn and fresh replenishing air is brought into the system, desirably with heat exchange and temperature adjustment to that of a conditioned space, and is distributed alternately as an air screen over any open doorway or conveyor opening and when the doorway or conveyor opening is closed, the fresh air flow is shifted by damper means to a central distribution point.
Patent•
28 Mar 1969
TL;DR: In this article, a damper is combined with a vehicle suspension spring, which also compresses the shot by an amount which varies as the rod reciprocates, and the resulting shot is filled with powdered or granular material (e.g. shot 18).
Abstract: 1280301 Friction dampers ASSOCIATED ENG Ltd 24 March 1970 [28 March 1969] 16504/69 Heading F2S In a damper comprising a casing 11, 12 and a rod 16 extending into or through the casing for movement relative thereto and provided with projecting parts (e.g. corrugated vanes 17), the casing is filled with powdered or granular material (e.g. shot 18). The damper is combined with a vehicle suspension spring 22, which also compresses the shot by an amount which varies as the rod reciprocates.
Patent•
29 Jan 1969
TL;DR: In this article, a damper mechanism for tall and tower-like structures, such as smokestacks and antennas, is described. Butler et al. describe a suspended mass such as a chain confined in an enclosure fastened to the primary structure.
Abstract: This disclosure concerns a damper mechanism for tall and towerlike structures, such as smokestacks and antennas, etc., and comprises a suspended mass such as a chain confined in an enclosure fastened to the primary structure. Vibrations of the primary structure produce opposing movements of the mass and resulting impacts of the mass with the enclosure sides in turn produce a damping force on the primary structure.
Patent•
04 Jun 1969
TL;DR: In this article, AABERG describes a ventilating room with two axial and two centrifugal fan units, one within a duct 28 and below a duct 8, located within the vent pipe (not shown) of a stable.
Abstract: 1,154,235 Ventilating rooms C P N AABERG 6 July, 1966 [8 July, 1965; 5 April, 1966], No 30367/66 Heading F4V In a stable, some air is extracted and some recirculated by a fan unit loacted in a vent pipe in the roof of the stable The fan unit comprises a fan 11 within a duct 28 and below a duct 8 which is located within the vent pipe (not shown) Part of the air withdrawn from the stable flows axially upwardly into the vent pipe and part is deflected by a baffle 24 to return radially into the room In an alternative embodiment two fans are employed, one axial fan within the duct 8 and one centrifugal fan below the duct 8, which fans may be driven independently by thermostatically controlled motors Air may be let into the room by means of up-turned inlet pipes (7, Fig 1) or by means of an annular passage 33 around the duct 8 The rate of outflow of air is controlled by simultaneously operable dampers 13, which are lifted by the air flow to an extent which is controlled manually (Fig 2) or by a thermostatically controlled servomotor 39 The rate of in-flow of air may be controlled by a slidable duct length 34 which protrudes beyond the inner end of the annular passage 33
Patent•
01 Oct 1969
TL;DR: In this paper, a preference is an automatic DAMPER control to open SUCTION LINES that REMOVE CHIPS, DUST, and other debris during the operation of WOOD WOOD WORKING TYPE MACHINES.
Abstract: IN ABSTRACT, A PREFERED EMBODIMENT OF THIS INVENTION IS AN AUTOMATIC DAMPER CONTROL TO OPEN SUCTION LINES THAT REMOVE CHIPS, DUST AND OTHER DEBRIS DURING OPERATION OF WOOD WORKING TYPE MACHINES AND TO CLOSE THE SUCTION LINES WHEN THE MACHINE IS SHUT DOWN.
Patent•
IBM1
TL;DR: In this paper, an air reader is used to operate binary latch valves through an air hydraulic interface, and an incremental paper tape feed with a four motion rack with toggle action operates the air reader.
Abstract: A digital hydraulic system converts binary digital input information into displacement of a digital drive. An air reader is used to operate binary latch valves through an air hydraulic interface. A flow-sensing system and a hydraulic logic unit cooperate to provide high-speed exchange between the piston adders of the digital drive prior to displacement of the load. A hydraulic cylinder sweeps the load about a vertical axis. A selfcooling, air-driven hydraulic pump with an accumulator provides relatively constant pressure. A damper secured to the piston adders has an additional drive for providing precise location at the end of damping. An incremental paper tape feed with a four motion rack with toggle action operates the air reader.
Patent•
06 Nov 1969TL;DR: In this paper, the authors describe a scenario where a large, fast, and unpredictable air flow leads to large, unstable models and possible damage to the model and test balancing on the model.
Abstract: A DAMPER SYSTEM FOR ALLEVIATING AIR FLOW SHOCK LOADS ON A WIND TUNNEL MODEL DURING THE STARTING AND SHUTDOWN PHASES OF A WIND TUNNEL WHERE UNSTEADY FLOW NORMALLY EXISTS LEADING TO LARGE, UNSTEADY MODEL LEADS AND POSSIBLE DAMAGE TO THE MODEL AND TEST BALANCES ON THE MODEL.
Patent•
03 Dec 1969
TL;DR: In this paper, an electromechanical transducer coupled to a rotating shaft was used to damp the torsional oscillations of a rotating-shaft, which can then be readily dissipated by applying it to load resistors.
Abstract: Apparatus for damping the torsional oscillations of a rotating shaft, is provided which includes an electromechanical transducer coupled to said shaft for converting a substantial portion of the mechanical energy generated by the torsional oscillations of the shaft to electrical energy which can then be readily dissipated by applying it to load resistors.
Patent•
08 Aug 1969
TL;DR: In this article, an end-weighted pendulum is suspended on a torsion wire which extends parallel to the spin axis of a spacecraft and restrains the pendulum to swing in a plane normal to the spinning axis, if the spacecraft is nutating.
Abstract: An end-weighted pendulum is suspended on a torsion wire which extends parallel to the spin axis of a spacecraft and restrains the pendulum to swing in a plane normal to the spin axis, if the spacecraft is nutating. The end of the pendulum is a vane member formed of electrically conductive, nonmagnetic material which swings between the pole faces of a magnetic structure and creates eddy-current losses within the vane member to dissipate the nutation energy. Means are provided for changing both the eddy-current damping coefficient and the mechanical resonance of the nutation damper structure so that the damper is effective in dissipating nutations at more than one spacecraft spin rate.
Patent•
08 Aug 1969
TL;DR: In this article, a thermohydraulic control device for a ventilation or air supply damper consisting of a hydraulic motor, comprising a cylinder in which a plunger piston is movably disposed, the volume of the cylinder being of such a size relative to its cross-sectional area that the cylinder can at the same time act as a temperature responsive element, the piston pin is coupled to the damper shaft by means of a single-toothed rack and pinion wheel connection having engagement surfaces which lock thedamper in the open or the closed position, respectively, when the tooth
Abstract: A thermohydraulic control device for a ventilation or air supply damper consisting of a hydraulic motor, comprising a cylinder in which a plunger piston is movably disposed, the volume of the cylinder being of such a size relative to its cross-sectional area that the cylinder can at the same time act as a temperatureresponsive element, the piston pin of the plunger piston being coupled to the damper shaft by means of a single-toothed rack and pinion wheel connection having engagement surfaces which lock the damper in the open or the closed position, respectively, when the tooth of the rack is out of engagement with the single toothspace of the tooth wheel.
Patent•
19 Aug 1969
TL;DR: In this article, a control unit for an active vehicle suspension system of the kind in which hydraulic struts acting on the wheel suspension linkages are in series with springs and have hydraulic fluid fed to and from them in response to vehicle body movements comprises a pendulum device connected to a rotary damper.
Abstract: A control unit for an active vehicle suspension system of the kind in which hydraulic struts acting on the wheel suspension linkages are in series with springs and have hydraulic fluid fed to and from them in response to vehicle body movements comprises a pendulum device connected to a rotary damper which is in parallel with a spring The body of the damper is rotatably mounted in bearings in a mounting plate for securing to the vehicle bodywork and adapted to be rotated by movements of the suspension linkage and the damper spindle carries the pendulum and acts on hydraulic valves controlling the fluid flow The spring can be a leaf spring interconnecting the damper body and the pendulum
Patent•
30 Jun 1969TL;DR: A relatively quiet back draft damper for an exhaust fan constructed as a casting of a vibration absorbing, synthetic, plastic material including integrally formed pivot pins and a stop and being sufficiently resilient to permit the endwise assembly or removal of the pivot pins from fixed journals is described in this paper.
Abstract: A relatively quiet, back draft damper for an exhaust fan constructed as a casting of a vibration absorbing, synthetic, plastic material including integrally formed pivot pins and a stop and being sufficiently resilient to permit the endwise assembly or removal of the pivot pins from fixed journals.
Patent•
[...]
TL;DR: An inlet vane damper has a rigid ring interconnecting the vane shafts for closing or opening the vanes simultaneously as discussed by the authors, and a crank arm of spring material interconnects each shaft with the ring to tolerate minor variations in the movement of the various arms with respect to the ring.
Abstract: An inlet vane damper having a rigid ring interconnecting the vane shafts for closing or opening the vanes simultaneously. A crank arm of spring material interconnects each shaft with the ring to tolerate minor variations in the movement of the various arms with respect to the ring to obviate the necessity for precision in the manufacture and assembly of the damper control elements.