Showing papers on "Damper published in 1981"

Seismic Effectiveness of Tuned Mass Dampers

Abstract: Time history analysis of 1DOF systems with and without a tuned mass damper, subjected to a set of historical earthquakes, shows that the peak response ratio (ratio between the peak responses with and without damper) depends primarily on damping constants and on earthquake duration The same analysis reveals that response ratio values are widely scattered and that the mean response ratio in underestimated by conventional stationary random vibration calculations Improvement is obtained by considering response movement and broadening of the response spectral density function caused by the damper Based on these considerations, a probabilistic model is developed that gives the distribution of peak response of buildings modified by addition of a tuned mass damper in terms of the same distribution for the unmodified structures For elastic systems tuned mass dampers have small antiseismic effectiveness

Energy control system

Abstract: An energy control system for a dwelling with a plurality of rooms is disclosed wherein said system has a plurality of occupancy sensors, with each sensor adapted to detect the presence of a human being in a room. The occupancy sensors are all connected to a computer with the computer controlling a plurality of dampers that regulate the air flow in the air ducts into the various rooms. Upon the detection of the presence of a human being in a room by the occupancy sensor, the computer sends a signal to the air damper controlling the air flow into that room to open the air flow through that air duct.

The Mechanics of Automotive Hydraulic Dampers at High Stroking Frequencies

Abstract: (1981). The Mechanics of Automotive Hydraulic Dampers at High Stroking Frequencies. Vehicle System Dynamics: Vol. 10, No. 2-3, pp. 82-85.

Central air conditioning equipment

Abstract: Central air conditioning equipment which performs air conditioning for a plurality of rooms, comprises a terminal air quantity control unit which is installed in order to communicate with each room and which controls the quantity of the air stream which is distributed to each room through a duct, and an air quantity control device, attached to an air conditioner, which controls a blower to reduce the blown air quantity until at least one of dampers reaches a first position to allow air flow when all of the dampers are not in the first position, which controls the blower to decrease the blown air quantity when an air quantity detected by an air quantity sensor is smaller than an air quantity set by a setter while at least one of the dampers is located in the first position, and which controls the blower to maintain the blown air quantity when the air quantity detected by the air quantity sensor is equal to the air quantity set by the setter.

Damper for suspension of an engine

Abstract: A damper comprises a plurality of armatures between which an elastic block is interposed. A partition plate divides the interior bore of the elastic block into two chambers. The chambers are filled with a working fluid and communicate with each other through an orifice providing a restricted flow communication and also through holes providing an unrestricted flow communication. A valve is provided to close the holes to prevent the unrestricted flow communication.

Heater unit for use in an air conditioner for automotive vehicles

Abstract: A heater unit for use in an air conditioner for automotive vehicles comprises: a casing formed therein with an air inlet passage, a discharging air passage communicating the air inlet passage with an upper or face-level air outlet or a floor air outlet, a heating air passage extending from the air inlet passage to the inlet of a heater core, and a hot air passage extending from the outlet of the heater core and terminating at least in a side wall of the heater core where it intersects with the discharging air passage; a temperature adjusting damper for adjusting the ratio of air being supplied from the air inlet passage to the discharging air passage and air being supplied from the air inlet passage to the heating air passage; and an auxiliary damper arranged at the intersection of the air discharge passage with the hot air passage or in its vicinity for interrupting the communication between the latter two passages. The auxiliary damper is adapted to be in a position to interrupt the communication of the air discharge passage with the hot air passage when the temperature adjusting damper is in the maximum cooling position, and in a position to allow the communication between the two passages when the temperature adjusting damper is in either of the maximum heating position and an intermediate position between the maximum heating position and the minimum cooling position.

Two-stage torsional vibration damper

Abstract: A torsional vibration damper assembly to provide extended travel for the dampening effect which is achieved by the use of two concentric series of damper springs interconnected through a common housing or intermediate member. A driving plate has two or more drive tangs secured thereon, which tangs extend inwardly into the path of the outer circle of damping springs. One or more floating divider rings are journalled in the assembly and have ears projecting into the path of the springs as do outer drive straps of the intermediate member. Floating wedges or skates are located between the springs of the inner circle along with inner drive straps of the intermediate member and hub arms in the path of the inner springs; the hub being driven through the circles of springs to drive a transmission input shaft.

Fire damper and method of fabrication

Abstract: A butterfly damper with a plurality of blades which can be locked in the open position, and which, when released, rotate about a hinge to the closed position A pawl member, attached to one blade, extends away from the blade and through an opening in a second blade when the blades are in the open position A mounting member attached to the second blade restrains the pawl member thereby holding the blades in the open position A bimetallic link attached to the mounting member causes the pawl member to be released when the temperature of the air passing through the duct increases beyond a preselected level A closure spring attached to the blades acts on the blades tending to force them apart against the action of the mounting member and the pawl member when the blades are restrained in the open position The damper blades can be insulated to prevent the heat from a fire on one side of the damper from being conducted by the damper to the other side when the blades are in the closed position A method of fabricating a butterfly damper is described which minimizes welding and riveting thereby simplifying fabrication

Blade to blade vibration damper

Abstract: Apparatus for dampening rotor blade vibratory energy in a rotary machine is disclosed. Concepts employing blade to blade damping are discussed. In one detailed form, a damper (52) is disposed to seat against the undersides of adjacent blade platform sections (20) and a seal (42) is spaced sufficiently close to the damper so as to be deflected against the damper under centrifugal loads to augment dampening of the rotor blades by the damper.

Steady-State Analysis of a Permanent Magnet Synchronous Motor Drive with Current Source Inverter

Abstract: A steady-state analysis of a permanent magnet (PM) synchronous motor drive with a voltage-source inverter (VSI) is presented. The torque-speed profile required of the drive is a constant torque region from zero to base speed and a constant power region above base speed. Assuming position feedback control from a shaft-position sensor, optimum strategies are obtained for the two regions of the torque-speed profile. Using these optimum strategies, performance curves of the drive are predicted and experimentally verified. The harmonic distortion in the motor is strongly dependent on the presence and configuration of dampers in the motor. An expression is obtained for the equivalent inductance seen by the harmonics for different damper configurations. A Fourier series approach is used to predict the line current waveforms. Since dampers are not otherwise essential to the operation of this type of drive and since the line current without dampers is nearly sinusoidal, it is concluded that it is advantageous not to have dampers in the motor.

Proportional motor drive control

Abstract: An air conditioning control system has inputs for room temperature and air velocity voltage signals. Both signals are scaled and compared to determine which signal is larger, and the magnitude of the difference. The control circuit drives a variable speed damper motor in a direction determined by the greater of the two scaled input signals. The motor is driven at a rate proportional to the magnitude of the difference between the two signals. Means for setting the maximum and minimum open damper positions are provided within the control circuit.

Variable venturi, variable volume, air induction input for an air conditioning system

Abstract: A unit for heating or cooling multiple rooms including a plenum diffuser mounted parallel within a ceiling runner and supported by hangars within the ceiling plenum. Each unit includes a round inlet collar, an elongated plenum to form a "Venturi," hinged volume dampers, secondary air openings, a bottom plenum chamber, and a pattern controller. The volume dampers housed within the Venturi work in unison. When the volume dampers are open, the unit functions similar to any conventional heating or cooling plenum diffuser. Primary air (heating air or cooling air) will enter the unit and leave through a discharge opening with no change in the air quantity or temperature. As space cooling or heating requirements are met, the volume dampers close at a preset distance, the primary air is reduced (variable volume), the velocity is increased and induces (induction) warm return air through the secondary air openings from the ceiling plenum, or ducted room return, into the primary air stream. This maintains effective room air motion and varies the air discharge temperature (variable discharge temperature) to bring the space to the desired temperature quicker. A pattern controller is located at the discharge opening of the unit, which when rotated, will adjust the air system to numerous air patterns.

Compound damper assembly for an automatic transmission

Abstract: A damper assembly for cushioning the application of a torque delivery clutch in a torque converter transmission wherein the converter provides a complementary hydrokinetic torque delivery path, the damper assembly including a pair of cushioning springs acting in parallel and a third spring arranged in series relationship with respect to the paired cushioning springs, the spring rates being chosen to provide dampening forces that vary nonlinearly with the magnitude of the torque delivered through the damper.

Leveling system for motor vehicles

Abstract: A leveling system for motor vehicles including leveling dampers at front and rear road wheels, a solenoid-operated selector valve assembly connected between an air compressor and the leveling dampers, and a central processing unit programmed so as to be responsive to command signals from level sensors or a manual override control switch for controlling the selector valve assembly to direct pressurized air through selected pneumatic circuits to the level dampers, thus adjusting the riding height of the vehicle frame, even in opposite directions, at the front and rear road wheels. A drier is disposed in the pneumatic circuit downstream of the air compressor to remove water from the pressurized air for preventing the leveling system from malfunctioning due to the presence of water in the system.

Air-conditioning apparatus for motor vehicles

Abstract: Air conditioning apparatus for conditioning the air supplied to a vehicle passenger space is provided which includes an air conditioning air cooling evaporator and an air heater unit arranged in series. An evaporator bypass duct extends in bypassing relationship to the evaporator and a heater bypass duct extends in bypassing relationship to the heater. To control the temperature of the air conditioned by the apparatus two temperature mixing air flaps are provided, one air flap controlling the proportion of air flow through the evaporator and its bypass duct and the other air flap controlling the proportion of air through the heater and its bypass duct.

Air regulating device

Abstract: An automatic air regulating device for use in a forced air heating or cooling system whereby air vents or ducts leading to various rooms within a building may be automatically opened or closed to conserve energy. The automatic air regulating device of the present invention utilizes airfoil shaped dampers rotatable between open and closed positions within the building's air ducts. This airfoil shape thus provides for efficient and inexpensive operation of the dampers by utilizing the forced air flowing through the system for its operating forces. The dampers are further controlled by operation of restraining means which establish opening and closing conditions of the dampers in response to programmed or timed parameters set according to desired occupancy or use patterns within the building.

Shock absorber and air spring assembly

Abstract: A shock absorber sub-assembly (16) and an air spring sub-assembly (18) constituting an assembly (16, 18) which assembly (16, 18) is particularly adapted for use in a tilt cab suspension system. It provides the capability of remotely adjusting the amount of damping on the down stroke of a damper piston (28).

Extended travel damper in a lock-up clutch for a torque converter

Abstract: An extended travel vibration damper for a lock-up clutch utilized in a torque converter where both the clutch friction surfaces and the damper structure are located radially outwardly in the torque converter housing, with the damper being formed of a plurality of annular members with damper springs to provide a compact structure where there is limited space in the torque converter.

Full extension locking device of damper

Abstract: Full extension locking device which securely maintains the fully extended state of the stay damper, etc. for closing and opening of the back door of a car and which assures smooth contraction of the damper when an external force is added. An elastic cover (8) along the cylinder is fixed to the piston rod (3) and this cover is deformed and blocked by the stopper (6) provided on the cylinder at the time of full extension of the damper, and the locking is released at the time of contraction. It is possible to see whether the lock is working or not at the time of full extension locking, and there is no danger of hands being caught or hurt when the lock is released, and also the structure is simplified.

Air conditioning system for motor truck

Abstract: An air conditioning system for a motor truck for establishing thermally confortable conditions for an occupant sleeping on a berth provided in a driver's cab. The system includes an air duct for distributing part of the conditioned air to vicinity of the berth and a damper adapted to open or close the inlet of the air duct. The system may include a microcomputer for automatically controlling the temperature of the introduced air and distributing the temperature-controlled air optimumly by automatically causing the damper to open or close the inlet of the air duct depending upon whether the berth is occupied or not, the temperature outside the driver's cab and the temperature in the vicinity of the berth.

Hydraulic vibration damper with noise reduction damping valves

Abstract: A hydraulic vibration damper featuring reduced noise characteristics wherein a first and a second damping valve system operate in response to fluid pressure to control flow of damping fluid in each direction of movement, respectively, of a piston of the damper. The first and second damping valve systems include a preliminary throttling aperture, an aperture disc defining a preliminary aperture located downstream relative to the direction of fluid flow through the respective damping valve systems, and a noise reduction mechanism for producing a post-throttling effect downstream of the preliminary aperture, the noise reduction mechanism being formed by a baffle plate located to be impinged by fluid flowing through the preliminary aperture, the baffle plate being arranged to define a quieting duct immediately adjacent the baffle plate upstream thereof.

Air distributor with automatically closable damper

Abstract: A reciprocating pneumatic actuator moves the damper of an air diffuser between open and closed positions and is automatically vented to atmosphere if fire or high heat occurs in the vicinity of the diffuser. When the actuator is vented, the return spring of the actuator snaps the damper to its closed position. A heat responsive latch automatically holds the damper in its closed position and prevents the damper from dropping open in the event the return spring is weakened by heat.

Method and system for controlling a vehicle-mounted air conditioner

Abstract: A vehicle-mounted air conditioner includes a compressor which, when powered by the vehicle engine, supplies pressurized refrigerant to an evaporator to increase its cooling capacity, a heating unit located downstream of the evaporator and partially occupying the passage of air cooled and directed toward vehicle interior by the evaporator, and a mixing damper pivoted at a point upstream of the heating unit to adjust the amount of cool air presented thereto in relation to the air directed toward the vehicle interior. The compressor is coupled to the engine when the temperature in the vehicle interior indicates a demand for a temperature decrement, or decoupled from the engine when the interior temperature indicates a demand for a temperature increment. A control system detects when the compressor is switched from a first operating state to a second state and initiates a timing action to measure the elapse of time from the time of detection of the occurrence of the transient condition. A time-varying signal is generated when the measured amount of time reaches a predetermined value for controlling the mixing damper to gradually vary the amount of air presented to the heating unit in relation to the air directed to the vehicle interior.

Torsional vibration damper with path conversion stage

Abstract: Torsional vibration dampers are increasingly being installed in the clutch discs of friction clutches. These dampers perform a damping function between the hub and the friction facings of the clutch disc, damping torsional vibrations, which originate from the internal combustion engine and should not reach the driving wheels via the gearbox. These torsional vibration dampers customarily consist of a spring device and of a damping device, e.g. a frictional damping device. At the same time, large angular deflections are increasingly being demanded. For this purpose, it is proposed to provide a path conversion stage between the hub and the facing carrier, it being possible to a large extent to retain the remaining components of the torsional vibration damper and there is likewise essentially no need for changes in relation to the prior art as regards the space provided for the spring device. The path conversion itself can, for example, be effected via two-armed levers or via an epicyclic gear arrangement.

Resilient mountings for machines or machine components, particularly engines in motor vehicles

Abstract: In an arrangement according to this disclosure, a spring element (3, 7) is arranged between a mounting core member (2) and a support (6) and is connected to a damper mass (9, 12). The damper mass has a container (10) which is filled with pressure liquid and/or gas and closed by a diaphragm (13). The spring rate of the diaphragm can be varied as desired, particularly in dependence on the speed of rotation of the machine or engine. For varying the spring rate of the diaphragm, a pressure plate (15) is associated with the diaphragm, and is displaceable relative to the diaphragm by way of an adjusting arrangement (16, 17) dependent on the speed of rotation of the machine or engine, and the relative configurations of the pressure plate and the facing diaphragm are such that this displacement reduces or increases the free area of the diaphragm, and thus varies its spring rate.

Combination vibration damper and fastener for union of two panels

Abstract: A combination vibration damper and fastener comprises head portions of the shape of a suction disc opposed back to back to each other across a space and adapted to collide with two separate panels, shanks extended in opposite directions from the head portions and provided with engaging means, damper pieces extended aslant from the head portions so as to be opposed to each other, and a connecting piece serving to connect the two head portions to each other. Insertion of the opposite shanks into the fitting holes bored in advance in the two panels fastens the two panels as separated by a fixed distance from each other. Vibration arising in one of the panels is absorbed by the damper pieces and prevented from reaching the other panel.

Damper in particular for suspension of an engine

Abstract: A damper comprises a plurality of armatures (1, 2) between which an elastic block (3) is interposed. A partition plate (5) divides the interior bore of the elastic block into two chambers (A, B). The chambers are filled with a working fluid and communicate with each other through an orifice (4) providing a restricted flow communication and also through holes (14) providing an unrestricted flow communication. Valve means (15, 16) is provided to close the holes to prevent the unrestricted flow communication.

Bumper for vehicles, particularly motor vehicles

Abstract: A bumper for vehicles, in particular automobiles, having a beam and dampers secured to the beam by means of retention devices in a manner so as to eliminate the use of auxiliary attachment devices, such as washers, cotter pins, etc., in order to prevent dislodgment of a bolt securing each retention device to the beam. In accordance with the preferred embodiments, each retention device and damper is provided with a bore. Within this bore a bolt is inserted that extends from an upper portion of the retention device, through the damper into a lower portion of the retention device. The bolt is retained in this bore either exclusively by bumper flanges overlying the opposite ends of the bore, or by the use of only one such flange and a blind bore having a check wall in the lower portion of the retention device.