Showing papers on "Damper published in 1982"

Single zone HVAC controlled for operation in multiple zone arrangement

Abstract: A monitoring and control system for a heating, ventilating and air conditioning (HVAC) unit which provides zone control in plural zones in which each zone includes a control thermostat that is interfaced with the monitoring system so that each zone thermostat controls the HVAC unit as well as a damper unit for that particular zone thereby enabling independent zonal control in a multiple zone system which uses a single zone HVAC unit. The monitor considers individual zone needs, damper positions, amount of demand in the zone, mode of the zone damper and other factors which affect the comfort of zone occupants and, in response to signals from the thermostats, decides how and when to control the HVAC unit so that, in effect, a single zone HVAC unit becomes a multiple zone system. The system is comprised of two or more computerized thermostats which control both the HVAC unit through the monitoring control and the air distribution system of each zone through the damper for each zone, creating a heating, cooling, variable air volume and variable temperature control system. The thermostats also operate under control of signals received from the monitor.

Variable air volume building ventilation system

Abstract: A variable air volume ventilation system (10) is disclosed in which the output air flow from a supply fan (13), delivered through a supply duct (11) to various places within a building, is returned by a return duct (15) through a return fan (17) and then through a connecting duct (18) back to the inlet (20) of the supply fan (13). The static pressure in the supply duct (11) is sensed by a static pressure sensor (40), and the output signal indicative of pressure is used by a variable frequency power supply (44) to provide power to drive the fan motors (36, 37) at a frequency inversely proportional to the difference between the sensed static pressure and a desired static pressure, thereby adjusting the flow through the ventilation system to match demand. Outside make-up air is provided through an outside air duct (50) and is fed into the return duct (15) at a position (52) near the inlet (16) of the return fan (17). The air flow through the outside air duct is controlled to a constant flow rate which matches the expected rate of exhaust air from the building so that the flow of air into and out of the building is balanced despite changes in the rate of flow through the ventilating system in response to demand.

Damped bearing device

Abstract: A damped bearing for damping the vibration generated in a bearing supporting a rotary shaft and shaft system, by a fluid film damper and by a resilient bearing support. The damped bearing is characterized by having a means in the fluid film damper for adjusting the damping coefficient of the fluid film damper.

Air temperature control system for vehicles

Abstract: An air cooling temperature control system for use in vehicles including a cooler having a compressor, a heater having an air-mix damper and a room air temperature regulator, in which feedback control is effected so that a room air temperature may coincide with a preset temperature value. The output of the heater is regulated to respond to sudden changes in the room air temperature by controlling the opening of the air-mix damper. The duty cycle of the compressor is regulated by a controller so as to respond to gradual changes in room air temperature while the output of the heater is at a low level and to incrementally decrease the duty cycle of the compressor when the output of the heater is above the low level, thereby driving the output of the heater down so as to minimize the counteracting effects of concurrent heating and cooling, so that the desired room air temperature is maintained with minimal energy.

Zone air-conditioning control system for motor vehicle compartment

Abstract: A portion of an air-conditioning unit is divided into two so as to provide first and second air-mixing chambers each following first and second temperature adjustment mechanisms. The temperature of air in the first chamber is controlled independently of the temperature of air in the second chamber, while the first chamber communicates with a first group of air-conditioning zone or zones and the second chamber communicates with a second group of remaining zone or zones. Thus, the temperature of air fed to the first group can be controlled in a manner different from the temperature of air fed to the second group. A plurality of distributing valves are provided at air discharging outlets communicating with the first or second chambers, and the opening degree of each damper may be controlled so that air distribution amount may be controlled. The temperature of the air in each of the first and second chambers and the opening degree of each damper may be automatically controlled in accordance with temperature measurement signals, temperature settings and other information such as the intensity of sun light.

Multi-blade automatic air register damper

Abstract: An automatically controlled multi-blade damper device for use in air registers installed over furnace duct boots terminating in recesses of floors, ceilings, or walls of dwellings; said boots being part of a central heating and/or air conditioning system. The several damper blades are attached to a gear train and pivotably mounted in a damper housing assembly; said blades being rotatable between open and closed positions by motor driven damper blade attached to gear means and motor means; said motor means, electrically connected to furnace control means and to individual room thermostat, cooperate to maintain the preferred temperature environment in subject room.

Multizone air-conditioning system for motor vehicles

Abstract: A multizone air-conditioning system for a motor vehicle includes a single air-conditioning unit and an air distribution conduit. The air distribution conduit has multiple conduit portions with outlets respectively open to horizontally spaced apart zones of the passenger compartment. Each outlet has a switching damper for diverting a variable amount of conditioned airflow in response to a feedback control signal to vertically spaced apart zones of the compartment to automatically operate the system in one of different air-conditioned modes. The control signal is derived from temperature measurement data and a reference setting establised with respect to each horizontally spaced apart zone. The air-conditioning unit includes air mixing dampers respectively located in the conduit portions and a heating radiator having half portions thereof located respectively downstream of the mixing dampers. A correction signal is obtained from the result of comparison between the settings of air mixing dampers to control the setting of each switching damper to minimize the effect of thermal interferences which might exist between the conduit portions.

Rotor blade for a gas turbine engine

Abstract: A rotor blade for a gas turbine engine is provided with an internal tip damper comprising a damper weight which rotates under centrifugal load to cam itself into engagement between two components of the aerofoil, in particular the interior surface of the hollow aerofoil and the tip of a cooling air entry tube. By altering the degree of offset between the center of gravity of the weight and its support the frictional engagement may be varied.

Extended travel vibration damper assembly

Abstract: A torsional vibration damper assembly for extended travel of the damping assembly where the assembly is utilized in the limited space found in a housing of a torque converter between the forward converter housing wall and the turbine shell. The damper assembly is compact with an internal splined connection to the turbine hub and having an annular clutch plate secured to the periphery of the damper assembly to engage the other clutching components for a lock-up clutch. Three floating equalizers (13, 14, 15) are journalled on a hub plate, with each equalizer and the hub having three radial arms (35, 41, 44), and damper springs (64, 65, 66, 67) in groups of four are positioned between the hub arms and/or equalizer arms. A spring retainer housing provides the torque input from the torque converter housing and has three pairs of axially aligned drive straps in the path of the damper springs.

Linear and nonlinear analysis of fluid slosh dampers

Abstract: A vibrating structure and a container partially filled with fluid are considered coupled in a free vibration mode. To simplify the mathematical analysis, a pendulum model to duplicate the fluid motion and a mass-spring dashpot representing the vibrating structure are used. The equations of motion are derived by Lagrange's energy approach and expressed in parametric form. For a wide range of parametric values the logarithmic decrements of the main system are calculated from theoretical and experimental response curves in the linear analysis. However, for the nonlinear analysis the theoretical and experimental response curves of the main system are compared. Theoretical predictions are justified by experimental observations with excellent agreement. It is concluded finally that for a proper selection of design parameters, containers partially filled with viscous fluids serve as good vibration dampers.

Deployable folded multi-element satellite subsystems

Abstract: A solar panel satellite subsystem includes a first and second set of solar panels and booms joined together end to end in series and to opposite sides of the spacecraft by spring bias hinges These hinges include viscous fluid dampers Each damper has its own heater and thermostat coupled thereto to maintain essentially the same damper temperature as the ground test temperature at each hinge and maintain essentially the same desired rate of deployment at each hinge

Hrsg damper control

Abstract: A method of and apparatus for controlling a steam turbine system for a combined cycle power plant using measured parameters to control the position of dampers regulating heat flow to steam generating equipment so as to limit thermal stresses, drum level surge and to provide load-following capabilities.

Industrial process control apparatus and method

Abstract: The present control system and method for controlling the combustion chamber pressure in a non-linear combustion process is operative in relation to one or more combustion chambers each having a flue gas damper In the case of a plurality of such chambers, the outlet duct associated with each chamber is connected to a common exhaust stack This operation is in relation to a desired damper position control characteristic provided by a combination of process signals in a microprocessor computer apparatus Information in the form of the combustion and pressure levels as supplied in an anticipative feed-forward control manner by a particular combustion chamber is utilized in conjunction with a variable gain characteristic determined by the actual position of the damper operative with that combustion chamber to determine the correct damper position for that chamber

Automobile air conditioner

Abstract: An automobile air conditioner of a reheat air mix type, having an evaporator disposed in a duct and a heater core disposed in the duct at the downstream side of the evaporator. Chilled air passages are formed between both sides of the heater core and the surfaces of opposing walls of the duct. The chilled air passages are extended to form a first duct leading to an upper air outlet to the room of automobile and a second duct leading to a lower air outlet opening to the room. A part of the warmed air coming from the heater core is delivered to the first duct while the other part is delivered to the second duct. The air conditioner further has a first air mix damper for controlling the ratio between the flow rate of chilled air flowing into the heater core and the flow rate of the chilled air flowing into the first duct, and a second air mix damper for controlling the ratio between the flow rate of chilled air introduced into the second duct and the flow rate of warmed air flowing from the heater core into the second duct.

Method of operating a variable volume multizone air conditioning unit

Abstract: A variable volume multizone unit is disclosed for simultaneously supplying variable amounts of cool, warm or neutral air to each zone, as required. The unit is under the overall control of a computer and controls dampers located at the unit to regulate the flow of cool and neutral or warm air to each zone individually and to control the total amount of air supplied to all of the zone.

Motor operated fire damper

Abstract: A fire and smoke damper having an electric motor coupled with the damper to hold the damper blades open when the motor is energized. A spring associated with the motor provides torque for closing the blades when the supply of electrical energy to the motor is interrupted. A thermal responsive electrical switch is mounted on the damper and incorporated in the electric circuit which supplies energy to the motor so that the motor is de-energized and the damper is closed when the ambient temperature reaches a predetermined level.

Investigation of a Rotor Bearing Assembly Incorporating a Squeeze-Film Damper Bearing

Abstract: Squeeze-film damper bearings, when properly designed, are a simple means of curbing instabilities and reducing vibration in rotor-bearing assemblies. This paper describes vibration tests carried ou...

Dry viscous spring damper

Abstract: A dry viscous spring damper is provided particularly adapted for absorbing shocks, dissipating energy and load carrying and leveling of a vehicle. The spring damper is comprised of a first housing member at least partially received in a second housing member and joined at the second housing member with an elastomeric shear spring. The spring damper has a first chamber separated from a second chamber by an elastomeric diaphragm. A valve is provided for selectively pressurizing the second chamber with pressurized gas or air. A plurality of elastomeric particles are included in the first chamber whereby relative movement between the housing members operates to stress the shear spring and the elastomeric particles, and vary the volumes of the first and second chambers.

Component Mode Synthesis of Large Rotor Systems

Abstract: A scheme is presented for calculating the vibrations of large multi-component flexible rotor systems based on the component mode synthesis method. It is shown that, by a modal expansion of the elastic interconnecting elements, the system modal equation can be conveniently constructed from the undamped eigen representations of the component subsystems. The capability of the component mode method is demonstrated in two examples: a transient simulation of a two-spool gas turbine engine equipped with a squeeze-film damper; and an unbalance response analysis of the Space Shuttle Main Engine oxygen turbopump in which the dynamics of the rotor and the housing are both considered.

Fuel combustion control system

Abstract: Estimated fuel flow rate is calculated by reading first data of the relationship between the opening degree of a fuel control valve and a fuel flow rate. Then, a compensation coefficient is calculated based on the estimated fuel flow rate, and the actual fuel flow rate is controlled on the basis of the compensation coefficient. Estimated excess air ratio is calculated by reading second data representing the relationship between the opening rate of an air control damper and the air flow rate. Then, the actual fuel flow rate and the air flow rate are controlled depending on the predetermined relationship of values between the estimated excess air ratio and the desired excess air ratio.

Furnace stack damper control apparatus

Abstract: A furnace stack damper control apparatus has a motor for connection to a stack damper to open the damper upon a call for heat by a space thermostat. The motor is driven in a closed direction by electrical energization and in an open direction by a spring return. A relay having two normally open switches and a normally closed switch is energized when a space thermostat calls for heat. The normally closed switch then opens to allow the damper motor to open the damper by the spring return. The motor has an end switch having a normally open and a normally closed circuit. The normally open circuit is used with one of the normally open switches of the relay to energize a gas valve when the damper is open. The normally closed end switch is used to provide the energization circuit for the relay by the space thermostat and the relay is maintained energized when the damper is open by the other normally open switch of the relay connected in parallel to the normally closed end switch. The circuit provides for additional safety in that normal operation of the gas valve control apparatus does not take place if the normally open or normally closed end switches stick in either position.

Vibration damper arrangement for vehicles

Abstract: In a vibration damper arrangement for vehicles, an axially extending vibration damper of the piston rod-cylinder type is mounted in a receptacle in a vibration damper support. The damper includes an axially extending jacket tube which is removably secured in the receptacle by a fastening device attached to one end of the tube. The fastening device exerts a tension force on the damper causing a stop surface on the jacket tube to be biased against another stop surface on the receptacle. At least one of the stop surfaces extends obliquely of the jacket tube axis.

Magnetic fluid damper

Abstract: PURPOSE:To optionally change the spring constant of a damper and more finely control its absorption of vibration, by such constitution that a magnetic fluid is sealed in the damper part simultaneously a flow of this fluid is electrically controlled. CONSTITUTION:In case of constitution as an engine mount 2, a rubber member 7 is deformed by vibration in a state when an electromagnet 8 is not electrically conducted, then a magnetic fluid in chambers 4, 14 moves through a small hole 6, located in a gap part 13 in both end parts of an iron core 9, by deforming a rubber plate 5. At this time, the small hole 6 being fixed in its size can not finely control absorption of vibration. On the contrary, if the electromagnet 8 is electrically conducted, magnetic flux is concentrated to a part of the small hole 6, and a virtual viscosity value of the magnetic fluid in this small hole part 6 is changed in accordance with a level of electric current. Accordingly, circulative resistance of the small hole 6 can be optionally changed to more finely control absorption of vibration.

Torque transmission device

Abstract: A torque transmission device particularly for a clutch disc unit to be used in a clutch assembly of an internal combustion engine comprises a hub member rotatable about an axis and a torque input member mounted on the hub member for angular movement with respect to the hub member about the axis of the hub member. A main damping unit and an idling damping unit are arranged for torque transmission from the torque input member to the hub member. A main damper input unit of the main damping unit is connected to the torque input member. A main damper output unit of the main damping unit is connected to an idling damper input unit of the idling damper unit and an idling damper output unit of the idling damper unit is connected to the hub member. A centrifugal mass-controlled locking member is provided for selectively permitting or locking angular relative movement of the main damper output unit with respect to the hub member. The angular movement of the main damper output unit with respect to the hub member is limited by interengaging abutment members having an angular play with respect to each other. The centrifugal mass-controlled locking member cooperates with these abutment members so as to selectively permit or lock this play.

Air conditioning economizer control method and apparatus

Abstract: An air conditioning economizer control method and apparatus for integrating the operation of the economizer (40) with an air conditioning system is disclosed. An economizer position control arrangement is further disclosed incorporating a rotor locking circuit (RLC) for maintaining the damper (43) in position against a bias applied by mechanical means such as a spring (90). A multiple position indicator (SW-1, SW-2) or multiple temperature sensor (MAT-1, MAT-2) is utilized to modulate the position of the damper utilizing the motor for opening the damper, a spring for returning the damper and a rotor locking circuit for maintaining the damper in position. Multiple temperature sensors (OAT, CLS) are also disclosed for making effective use of outdoor air when cooling through economizer operation is available. Staged cooling loads relative to outdoor ambient temperatures are utilized to select the appropriate mode of operation.

Add-on catalytic damper assembly

Abstract: An add-on catalytic damper assembly is provided which is adapted to be positioned between the flue outlet pipe of a wood burning stove and the chimney pipe, and which provides catalytic combustion of the normally unburned portions of the flue gas. The assembly is of a very simple five part construction comprising upper and lower housing members adapted to be connected to the chimney and stove pipes, respectively; a plate nestingly mounted within the lower housing member and including a pair of side by side openings therein providing two paths for the flue gas; a catalytic converter mounted in one of the openings; and a damper plate mounted over the other opening and movable by means of an integral handle between blocking and unblocking positions.

Combustion air trim control method and apparatus

Abstract: Air trim control actuator mechanically connects a fuel flow device to an air flow device for setting the air to fuel ratio in combustion apparatus. An air to fuel ratio control unit is responsive to electrical input signals from an oxygen sensor that monitors the combustion products in the stack emissions. The air trim actuator includes a pivotally mounted input arm that is mechanically connected to the control unit and is pivoted to a preselected position corresponding to the selected boiler load. The input arm is connected by a link to an output arm which is pivoted through a preselected range of movement to control the position of the damper. The output arm has an elongated arcuate slot for receiving the end of the link. The output arm is pivoted to a position corresponding to the pivoted position of the input arm for selectively positioning the damper to provide air flow to the boiler for the desired air/fuel ratio. Adjustments made to the boiler load automatically adjust the damper position for insuring that the proper air/fuel ratio is attained. The position of the link in the slot of the output arm is adjustable by a correction signal transmitted by the control unit to a motor, or the like, which moves the position of the second end of the link in the slot of the output arm. Thus, the range of movement of the output arm is adjustable in relation to the range of movement of the input arm. By adjusting the position of the end of the link in the slot in response to variations in the boiler load condition or other factors that effect the air/fuel ratio, the damper is automatically moved to continuously maintain the optimum combustion conditions.

Torsional vibration damper with laterally displaceable damping element

Abstract: The torsional vibration damper, which is suitable, in particular, for the clutch disc of a motor vehicle friction clutch, has two damper parts (2, 3), which can be twisted relative to one another about a common axis of rotation and are coupled to one another via an axial thrust face and a coupling part (5). During relative rotation of the damper parts (2, 3), the coupling part (5) is displaced counter to the axial force of springs (7). The coupling part can be firmly connected to one of the damper parts in the axial direction, but is preferably coupled to it in a manner which allows axial displacement but not relative rotation. The coupling part (5) expediently divides a space sealed off from the outside and at least partially filled with damping fluid into two subspaces (6, 6') which are connected to one another via a restriction passage (17). Torsional vibration dampers of this kind can be used to achieve large damping angles of rotation.