Showing papers on "Damper published in 1980"

Hysteretic dampers for the protection of structures from earthquakes

Abstract: The development of hysteretic dampers for the protection of structures against earthquake attack, carried out at the Physics and Engineering Laboratory over the past six years, is described. Details of both steel and lead devices and their application to bridges and base isolated buildings are given. Steel devices are designed to absorb energy by plastic deformation in torsion or bending, while lead devices rely on plastic extrusion or shear. The characteristics of PTFE sliding bearings are also described and the possibility of using this type of bearing to permit sliding on base isolated systems, and to allow dissipation of energy in joints in conventional structures, referred to. The most promising development is in the lead rubber bearing in which the properties of load-bearing and damping are combined in one unit.

A review of damping applications of ferrofluids

Abstract: Applications of magnetic liquid technology to damping phenomenon are reviewed. Products utilizing ferrofluids, such as a rotary viscous inertia damper, linear damper, damper/seal assembly, and dashpot are discussed. The rotary dampers are used to enhance stepper motor performance. A magnetic liquid film sheared between a moving and stationary component forms the basis of these devices. The fluid is retained by magnetic forces and does not leak out. Examples of actual use of these dampers on operating systems, along with the test results, are presented.

Microprocessor discharge temperature air controller for multi-stage heating and/or cooling apparatus and outdoor air usage controller

Abstract: An air conditioning system furnishing temperature conditioned air to a plurality of zones each of which has its own zone damper controlled by its own space thermostat. The system has an air discharge temperature sensor downstream of the temperature conditioning heat exchanger which is connected to a microprocessor controller for controlling a plurality of stages of temperature conditioning apparatus such as heating or cooling apparatus and a damper motor control for controlling the entry of outdoor air into the system. A reset thermal comfort sensor located in a representative zone or area is connected to the microprocessor controller for varying the controlled temperature of the supplied discharge air by operating the outdoor air damper motor and the multi-stage temperature conditioning apparatus to maintain the best use of outdoor air for cooling and the most efficient operation of refrigeration cooling apparatus by ensuring maximum air delivery to the heat exchangers during the operation of the mechanical cooling apparatus.

Air flow floor panel

Abstract: An air flow floor panel for a raised access floor system which includes an articulated frame surrounding a light weight grid component in egg-crate form. A laminated top plate having a plurality of holes therethrough is welded to the articulated frame and grid component and a pair of relatively slidable damper plates are secured to the bottom edge of the articulated frame by a plurality of S-shaped clips.

Controller for an air conditioning or heating system

Abstract: An apparatus is disclosed for activating a thermostat for an air conditioning or heating system. The apparatus comprises a control circuit and a controllable switch connected to activate and deactivate the thermostat controlling the air conditioning or heating system. A timing circuit provides a first timing period in which the thermostat is deactivated in addition to providing a second timing period to activate the thermostat. The control also includes a circuit for deactivating the thermostat for a period of time in the event the compressor terminates operation for any reason. An optional occupancy sensor increases the time of deactivation of the thermostat during periods of non-use of the area being air conditioned or heated. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

Viscous/friction damper

Abstract: A friction damper is mounted in series with a viscous damper to accommodate the normal magnitude vibration and the higher magnitude vibration occasioned from a larger imbalance of a jet engine rotor manifested by a bowed rotor and including a loading spring to allow the recentering of said friction damper when the higher magnitude vibrations subside.

Make-up air device for range hood

Abstract: A make-up air device for an overhead exhaust hood for a cooking range including a supply air plenum having a controlled air chamber in the outlet passage of the plenum for controlling the volume, velocity and direction of the flow of make-up air from the plenum over the cooking range. The controlled air chamber includes an upper inlet portion projecting into the air plenum space and including variably controlled damper blades. The lower discharge end of the control chamber includes adjustable louvers for controlling the direction of the discharged air. The adjustable louvers may be mounted in the bottom wall of the control chamber or the side wall. When the adjustable louvers are in the bottom wall, the side wall may be perforated to provide a by-pass flow. Moreover, when the adjustable louvers are in the bottom wall, a transverse perforated plate may be installed in the chamber between the inlet dampers and the discharge louvers in order to dampen the velocity of the air flow.

Air-handling unit

Abstract: The present invention provides an air-handling unit that can supply air, to a desired space, which is cold, which is cooler than the set point of the thermostat for that space and hence is referred to as cool air, which is warmer than that set point and hence is referred to as warm air, or which is hot. That unit can operate even when very low pressure air is supplied to it; and hence it is connectable to a conventional low pressure cold air duct. That unit may have a heat source incorporated into it, may utilize air from that space which is cooler than that set point and hence can be referred as cool air, and may utilize air from the space which is warmer than that set point and hence can be referred to as warm air. Dampers in that unit control the amount of cold air and cold air that is supplied to that space, and a blower and the heat source in that unit control the amount of warm air and hot air which is supplied to that space. Backdraft dampers in that unit permit aspiration of cool or warm air, but can substantially prevent the escape of any air from that unit even if a super-atmospheric downstream pressure develops.

Automatic fume hood airflow control

Abstract: Laboratory fume hoods with open hood faces closed by door sash are provided with an automatic airflow control regulating the quantity of air drawn into the hood in response to movement of the door sash for maintaining a controlled velocity of air through the hood face to keep fumes within the hood while reducing energy requirements for either heating or cooling the air to maintain safe operation. The open hood face is controlled by a vertically slidable sash or window counterbalanced by a weight that is connected to the sash by a cable which moves directly proportional to the movement of the sash. This cable actuates mechanism for opening and closing a damper in the exhaust system for the fume hood. In one embodiment, the cable drives a pressure regulator which controls an air motor to rotate the damper. In other embodiments the cable may drive reduction gear to the damper or control a servo motor which drives the damper. A plurality of fume hoods may be connected to a single constant static pressure exhaust system with each hood having its own sash controlled damper to maintain an air flow velocity that will provide safe operation of each hood with a minimum energy consumption.

Damper activation in a combined microwave and electric heating oven

Abstract: A combined microwave and electric heating oven including a damper mechanism for selectively and automatically introducing a forced air flow into an oven cavity. A timer is provided for determining a microwave cooking period, wherein a magnetron is energized to perform the microwave cooking operation. The damper mechanism is associated with the timer so that the damper is placed in a first condition wherein the forced air flow is automatically introduced into the oven cavity, when the timer is wound up to select a preferred microwave cooking period. When the preselected time period has been counted by the timer, the microwave generation is terminated, and the damper is placed in a second condition wherein the forced air flow is automatically never introduced into the oven cavity. The damper is placed in the second condition when the electric heating cooking is performed, whereby the interior of the oven cavity is maintained at a high temperature.

Vibration damper ring

Abstract: A damper ring for damping vibration of a structural member. The damper ring includes an annular recess for receiving an extension, such as a flange, of the structural member and can include radially extending tabs to restrict relative axial movement. The damper ring is preferably severed to allow it to be retained radially against the extension of the structural member.

Torsion vibration damper

Abstract: A torsional vibration damper having limit stops to limit the compression of the springs and to avoid overstraining of the springs. Spring retainers which seat on the driving and driven members have protrusions and recesses to minimize relative rubbing motion and wear and provide improved alignment of the spring seats in the assembly with the springs and the driving and driven members.

A method and an apparatus for air conditioning for vehicles by controlling circulation of inside air and introduction of outside air

Abstract: A method for air conditioning for vehicles comprising a step of detecting a temperature of a passenger compartment of a vehicle, an atmospheric temperature and a preset temperature in the initial period of air conditioning, a step of judging the results of comparisons between said temperatures and a step of switching between air conditioning by the circulation of inside air and air conditioning by the introduction of outside air.

Discharge air temperature control device having reference temperature control function for air conditioning system for automotive vehicles

Abstract: A discharge air temperature control device which is provided in an air conditioning system for automotive vehicles, the device comprising a lever assembly for adjusting the angular position of an air-mix damper, a driving circuit for driving the compressor of the air conditioning system, and a switching device for opening or closing the driving circuit in response to an air flow temperature signal supplied from a temperature sensor, characterized in that means is provided which is responsive to a change in the angular position of the lever assembly to vary a reference temperature value with reference to which the switching device opens or closes the driving circuit. The frequency of actuation of the compressor can thus be reduced to thereby save energy to be consumed by the air conditioning system. Further provided is means for selectively changing the above-mentioned reference temperature value into two levels which vary at different rates of variation relative to a change in the angular position of the lever assembly. Provision of this reference temperature changing means permits interruption of the operation of the compressor driving circuit when dehumidifying operation is not required, thus further saving energy to be consumed by the air conditioning system.

Thermally activated, automatic damper and damper operator

Abstract: A damper has a frame with a cross bar and a reciprocal blade. A bimetallic element which moves in response to temperature is coupled to the blade and is hingedly coupled to the cross bar so that movement of the bimetallic element in response to temperature causes the blade to move with respect to the frame. The coupling of the bimetallic operator and the frame is accomplished by a biasing hinge which is coupled to the frame and to the bimetallic element to couple the bimetallic element to the frame and control the temperature movement response of the element. The biasing force of the biasing means is adjustable for controlling the temperature movement response of the damper blade. The bimetallic element is a serpentine spring having a plurality of bends and the biasing means is a hinge. The closed position of the blade of the damper, as well as the biased temperature response of the damper, and adjustable by rotation of adjustment screws.

High efficiency ventilation system

Abstract: A ventilation system for institutional and commercial cooking equipment includes a hood which is placed over the equipment and which attaches to an exhaust duct and fan that removes a relatively constant volume of air from beneath the hood. A make-up air supply divides to form a fresh air duct that connects to the hood and a tempered air duct which also connects to the hood. The fresh air is directed beneath the hood by fresh air registers and the tempered air is directed into the surrounding room by tempered air registers. The relative amounts of fresh air and tempered air can be changed by a damper, but the damper does not significantly alter the total amount of supplied make-up air. The system can thus be adjusted to use more or less tempered air as various combinations of cooking equipment are used without affecting the overall balance of exhaust air and make-up air.

Nutation Dampers vs Precession Dampers for Asymmetric Spacecraft

Abstract: The energy dissipation efficiencies of ball-in-tube dampers oriented with their sensitive axes orthogonal to (nutation) and parallel to (precession) the nominal spin axis of an asymmetric spacecraft are studied using the energy-sink method and numerical integration. Energy-sink equations for each of the two types of dampers are obtained in the forms of damped, periodically forced Hill-type equations. The stability of solutions to Mathieu equation approximations to these equations is considered. An approximate analytical expression for the ratio of the average energy dissipation rates of the two types of dampers is obtained. Results for ideally tuned, identical (except for their spring constants and orientations) dampers are presented and compared with those of a previous study. For a particular spacecraft configuration, analytical results for the energy dissipation ratio are compared with numerical results, and excellent agreement is achieved.

Air conditioning device for automobile

Abstract: PURPOSE:To adjust upper and lower blown air temperatures respectively in accordance with a season, weather and individual fondness in an air-mixing air conditioning device, by providing both bypass passages above and below a heater core and air mixing dampers above and below the downstream side of the heater core respectively CONSTITUTION:There are provided a heater core 10 almost in the central portion, bypass passage 25, 26 respectively above and below said core, simultaneously upper and lower layer air mixing chambers 17 and 18 in places after passing the bypass passages 25, 26 with the border of a partition plate 14 Further upper and lower layer air mixing dampers 15, 16 are provided respectively in outlets of the bypass passages 25, 26, and an end part of the partition plate 14 at the heater core side is arranged to the intersecting point of the dampers 15, 16 Accordingly, air sucked by a fan 4 from inside and outside air introduction ports 2, 3 passes the heater core 10 and the bypass passage 25, 26 through a cooler case 5, and is blown by control of the dampers 15, 16 at temperature suitable for each mode of summer, intermediate and winter seasons, defrosting operation or the like

Noise damping device

Abstract: A noise damping device is proposed for reducing and smoothing pressure fluctuations in a damping medium, especially in fuel supplied by fuel supply pumps, which serves to reduce pressure fluctuations downstream of the fuel supply pump The noise damping device includes a diaphragm fluctuation damper which is disposed directly downstream of the pump compression collar and by means of which, by rotating the diaphragm fluctuation damper, an annular fitting is fixable in its axial position between the diaphragm fluctuation damper and the pump compression collar A check valve in the connection extension of the diaphragm fluctuation damper or in the annular fitting prevents the return flow of fuel out of the fuel circulatory system after the termination of fuel supply

Air flow damping system

Abstract: A control device for a triple-plenum air conditioning apparatus having a by-pass air duct, a hot air duct and a cold air duct. A first shaft mounted through the by-pass and hot air ducts carries a first by-pass air damper blade and a hot air damper blade at right angles to each other. A second shaft mounted through the by-pass air duct and the cold air duct carries a second by-pass damper blade and a cold air damper blade at right angles to each other. The control device includes a first geneva link on the first shaft, a second geneva link on the second shaft and a third shaft carrying a drive plate with pins for independently actuating the geneva links and a geneva cam for holding one of the geneva links against rotation while the other is being independently actuated. Rotation of the third shaft through one hundred degrees results in rotation of each of the first and second shafts through ninety degrees.

Heater with adjustable mix regulating damper for bilevel operation

Abstract: An air treatment assembly through which flows an air flow. The air flow is introduced into a ducting system, at an intermediate part of which a heater element is mounted. A first damper upstream of the heater divides the air flow into a first air flow portion passing through the heater and a second air flow portion bypassing the heater. First and second air outlets downstream of the heater element pass air out of the ducting system. A second damper, downstream of the heater element and upstream of the outlets, is movable between a first position in which it hinders the first and second air flows from mixing, so that the air passed out from the first outlet is primarily air from the first air flow, and the air passed out from the second outlet is primarily air from the second air flow; and a second position, in which it does not substantially hinder mixing of the first and second air flows, which meet downstream of the heater and mix well before being passed out from the air outlets.

Electrically-controlled damper

Abstract: A novel fluid-flow control damper is disclosed. The damper comprises a freely pivotable closure situated in a fluid-flow conduit, such as an air duct. The closure is maintained in a closed position by a simple latching means, and may be maintained in an open condition by means of fluid flow through the conduit. Several of these dampers may be used in combination with a single fluid temperature control device, resulting in a simple, low-cost multizone heating or cooling system.

System and method for controlling the conditioning and delivery of air to a conditioned space

Abstract: Air flows to the conditioned space through a cool air duct and a warm air duct which feed a common delivery duct. The inlet of the cool air duct is connected to a cool air supply duct of a parent system; and inlet of the warm air duct communicates with the return air plenum. Flow control components are air actuated and are controlled by actuators responding to a varying air pressure control signal, which is the output of a thermostat in the conditioned space producing a varying signal pressure signal related to varying temperatures. Dampers in the cool air duct and warm air duct provide for alternative air flow from either of these ducts to the delivery duct. The volume of air flow in the cool air duct is controlled by a modulating damper which responds to a selected signal pressure range. The air flow in the warm air duct is controlled by a fan and dampers, controlled through change of the signal pressure in either direction relative to a selected signal level. An electric heater in the delivery duct is energized and de-energized in response to change of the signal pressure in either direction relative to another selected signal level, whereby this heater is energized only in conjunction with air flow through the warm air duct.

Vehicle alarm shaker device with spring damper

Abstract: A shaker device for automobile alarm systems in which there is a vibratory member for making contact when the vehicle is disturbed and in which the vibratory member is damped by means of a relatively stiff cantilever supported member made out of spring wire.

Stabilizing structures against oscillation

Abstract: A device for stabilizing structures such as chimneys and like stacks against transverse oscillation, comprising a mass connected to the structure by a pendulum suspension so as to oscillate in a direction transverse to the axis of the structure. The pendulum suspension includes a damper. The oscillation frequency of the mass/pendulum/damper assembly is matched to the natural frequency of the structure's vibrations, whereby the latter are attenuated. The mass may be in the form of a ring, suspended from the top of the structure by at least three pendulum/damper units spaced around the periphery. The units may also include springs or other devices to modify the natural frequency of oscillation of the device. In one version of the invention the mass comprises a first ring suspended from the structure, and a second ring similarly suspended from the first ring.

Rubber/viscous torsional vibration dampers

Abstract: Tuned rubber/viscous torsional vibration damper assemblies of the kind having a supporting rotor disk mounting an inertia mass coupled to the disk by viscous damping medium and elastic tuning spring, spacing and sealing rubber rings located in rubber ring accommodating grooves. A viscous damping medium working chamber is defined within the inertia mass radially outwardly about the rings. The rubber rings are molded and vulcanized in situ in said grooves and to the rotor disk and the inertia mass. The dampers may be provided with rubber spacer and bumper fingers extending from the rubber rings into the working chamber of the damper. The rubber rings may also be keyed to the inertia mass by means of integral lugs extending into socket apertures in the inertia mass. The dampers may be coated with a rubber skin on outside areas, the skin being connected to exposed areas of the rubber rings.

Collision sensing system for vehicles and associated method

Abstract: A method and apparatus for operating a seat-occupant restraining device in response to collision of a vehicle, comprising a front bumper on the vehicle adapted for receiving impact in the course of a collision and supported by a damper which opposes rearward displacement of the bumper. The damping is a function of the change of velocity of the vehicle during the collision and is used to displace a normally stationary part of the damper when the collision force exceeds a predetermined value. The displacement of the stationary part of the damper serves to close a switch to actuate the seat-occupant restraining device. The switch can be an acceleration detection switch in which case the stationary part is supported by the vehicle body by a deformable structure or the switch can be made as a deformable unit which undergoes deformation by the application of force thereto from the stationary part of the damper.

Damped mounting for tractor hitch - has hydraulic angled damper to smooth vibrations and maintain wheel grip

Abstract: The mounting for a front or rear tractor hitch has an hydraulic damper (17) set at an angle between the vehicle and the load. The damper absorbs road vibrations so that the system can be driven at speed over rough ground. The dampened mounting ensures max. wheel grip without allowing the vehicle to pitch. The damper operation is tuned to the type of use by special flow control valves with adjustable flow.

Vibration absorber of vehicle

Abstract: PURPOSE: To efficiently absorb any low frequncy vibration generated on a vehicle, by elastically supporting a such as a radiator on a front end of a vehicle body so that its inherent vibration frequency becomes a prescribed value to have the part actuated as a dynamic damper. CONSTITUTION: A heavy weight part 1 such as a radiator or a battery on a front end of a vehicle body is mounted so that its inherent vibration frequency is kept within the range of 20W30Hz, by means of an elastic body 21, etc. is suppressed by a dynamic damper, so that vibrations of a steering post 8 and a seat 9 can be reduced. COPYRIGHT: (C)1982,JPO&Japio