Method of damping vertical oscillations of objects

FIELD: machine building.

SUBSTANCE: method is implemented owing to periodic decrease of restoring force of main pneumatic flexible element (3) of suspension. At the beginning of each rebound stroke additional mass of gas is supplied to additional flexible element (4) from an autonomous energy source (7). Also electromagnetic force effecting damped object (1) is additionally and briefly created by means of auxiliary damping electro-magnetic element (5). At the beginning of each compression stroke additional mass of gas is withdrawn from additional flexible element (4) into atmosphere.

EFFECT: raised damping properties of pneumatic suspension in all amplitude-frequency range of external effect.

1 dwg

 

The invention relates to mechanical engineering and can be used for damping oscillations of a vehicle.

There is a method of damping vertical oscillations of vehicles with pneumatic suspension described in A.S. No. 261926, M CL B60G 11/26, consisting in the reduction of the restoring force of the main pneumatic elastic elements by extraction of part of their internal energy.

The main disadvantages of the method include the fact that under forced vibration buffered object with large amplitudes is offset from its mean position down relative to the source due to the continuous accumulation of the energy of compressed gas in additional capacity at the beginning of each compression stroke, which reduces the dynamic suspension travel and reduce the effectiveness of damping.

There is also known a method of damping vertical vibrations of objects with pneumatic elastic elements described in patent No. 2304522 RF, M CL B60G 15/12, F16F 9/05 (prototype), which consists in the fact that it includes periodic reduction of the restoring force of the main pneumatic elastic elements at the beginning of each turn besieged by supply of an additional mass of gas to the additional elastic element from an Autonomous source of energy and its abstraction from the more elastic the element at the beginning of each compression stroke in the atmosphere.

The main disadvantage of this method is the inertia of processes for the creation of elastic counter force additional elastic element, which leads to the fact that directly after changing the suspension mode elastic force of the main elastic member is not compensated by the elastic force of the additional elastic element. This reduces the effectiveness of vibration damping object, especially when a large amplitude and the frequency range of external influences.

Object of the present invention is to improve the damping properties of the suspension in the entire frequency range of the external action.

This object is achieved in that in the method for damping vertical vibrations of objects, including periodic reduction of the restoring force of the main pneumatic elastic elements at the beginning of each turn besieged by supply of an additional mass of gas to the additional elastic element from an Autonomous source of energy and its abstraction of the additional elastic element at the beginning of each compression stroke in the atmosphere, according to the invention, at the beginning of each turn end for periodic reduction of the restoring force of the main pneumatic elastic suspension elements additionally create short-term due to the auxil telego electromagnetic damping element electromagnetic force, acting on depreciable object.

The drawing shows a pneumatic suspension, which implements the proposed method of damping vertical vibrations of objects.

Air suspension set contains between 1 and sprung unsprung 2 main masses 3 and 4 elastic pneumatic elements, with volumes respectively "a" and "b", the auxiliary electromagnetic damping element 5.

For supply of an additional mass of gas through a flexible pipe 6 from the receiver 7 in the cavity "B" at the beginning of each turn the lights out and exhaust gas mass at the beginning of each stroke compression ratio in the atmosphere is electroneurography (EPA) 8. Management of the EPC 8 is a sensor relative speeds of 9, which controls the switching of the switching device (relay) 10. Cavity "In the" additional elastic element 4 through a flexible pipe 6 and EPA 8 is connected in the process or with the receiver 7 of the vehicle, or with the atmosphere.

Auxiliary electromagnetic damping element 5 includes a housing 11, within which moves the rod 12, is rigidly associated with the sprung mass 1, which is the anchor 13 electromagnetic device in the form of a plate with perforations, the tip 14 and the electromagnetic device containing the magnetic core 15 with RA who laid on him the windings 16. Control of auxiliary electromagnetic damping element 5 is made by the sensor relative speeds of 9, which sends a signal to the control circuit of the electromagnetic device 17.

Damping vertical oscillations of depreciable object using the proposed method is as follows.

In a static position pneumatic suspension force of gravity of the sprung mass is balanced only by the excess pressure in the cavity "A", ie:

M·g=P10·S1,

where M is the mass of depreciable property;

P10 - pressure in the cavity "A" in a static position pneumatic suspension;

S1 is the effective area of the main elastic element;

g - free fall acceleration of the body.

During compression of the pneumatic suspension gas pressure in the cavity "A" increases, and in the cavity "b" by EPA 8 is equal to atmospheric, i.e. the elastic force of the suspension is determined by the elastic force of the main pneumatic element:

Ppanel=P1·S1.

At the beginning of turn end of the sensor relative velocity 9 is fed to a switching device 10, which connects the EPA 8 with a source of energy and EPA 8, including, according to the cavity "B" through the pipeline 6 and receiver 7, also a signal to the control circuit of the electromagnetic device 17.

In the initial period of the progress of selection is due to the inertia of the propagation of waves of air through the pipeline and filling the cavity of the additional elastic element 4 in additional elastic element 4, the mass of gas starts to increase, so there is a small elastic force, which is weakly resists significant elastic force of the main elastic pneumatic element 3. During this period, the sensor signal relative speeds of 9 control circuit of the electromagnetic device 17 connects the coil 16 of the electromagnetic device to a power source which generates electromagnetic force F(z), depending on the vertical displacement z (gap between the armature 13 and the magnetic core 15 and pulls the armature 13 to the magnetic circuit 15, acting on the sprung mass 1, reduces the restoring force of the main pneumatic elastic element 3. In the initial period of the stroke end, the electromagnetic force F(z):

P2·S2<<F(z)≤P1·S1,

where P2 is the current pressure in the cavity "B";

S2 - effective area additional elastic element.

Thus the elastic force of the suspension:

Ppanel≈P1·S1-F(z).

When the tip 14 of the rod 12 from the zone of the winding 16 is the electromagnetic force is sharply reduced by the exponential law and the coil 16 are disconnected by the control circuit 17 from the power source. If this is already implemented supply a considerable mass of air in the cavity "B" pressure P2 (P2≤P1) and at a later period of the stroke end of the additional elastic element exerts a substantial opposition to the main elastic element that PR is leads to a sharp decrease of the elastic force of the pneumatic suspension on the value of P2·S2, ie:

Ppanel=P1·S1-P2·S2.

At the beginning of the next compression stroke of the EPC 8 is de-energised and the cavity "B" through EPA 8 communicates with the atmosphere, which leads to the recovery of the elastic force of the pneumatic suspension.

Thus, the creation of additional short-term at the expense of the auxiliary electromagnetic damping element electromagnetic forces in the initial period of the end of each turn reduces the elastic force of the suspension until such time as due to the mass of the gas supply from an Autonomous source of additional energy in the cavity of the additional elastic element, it will not have a significant opposition to the main elastic element. At the beginning of each compression stroke rapid recovery of the elastic force of the main elastic element. All this leads to intense damping vertical oscillations of depreciable object in the entire frequency range of the external action.

Method of damping vertical vibrations of objects, including periodic reduction of the restoring force of the main pneumatic elastic elements at the beginning of each turn besieged by supply of an additional mass of gas to the additional elastic element from an Autonomous source of energy and its abstraction of the additional elastic element at the beginning of each Ho is and compression in the atmosphere, characterized in that at the beginning of each turn end for periodic reduction of the restoring force of the main pneumatic elastic suspension elements additionally create short-term at the expense of the auxiliary electromagnetic damping element electromagnetic force acting on depreciable object.



 

Same patents:

FIELD: transport.

SUBSTANCE: invention relates to machine building. Suspension comprises rubber-cord shell 1 with cover 2 that make main work chamber 3, extra chamber 4 and baffle 5 arranged there between. Baffle 5 accommodates valve device 6 comprising cylinder and radial bypass orifices. Shut-off valve, a piston, is fitted inside said cylinder. Electromagnet winding is connected to control system 7. Cover with radial bypass orifices is arranged above said cylinder and has inner surface provided with concentric sealing element. Extending flange is arranged along bottom edges of the piston. Sealing element is arranged on lower edge of said flange. Piston comprises additionally a rod covered by corrugated metalised jacket. Said rod accommodates return spring and magnetically conducting core. Concentric annular gap is provided between cover inner surface and piston side surface. Valve device control system comprises object travel transducer, object speed signal transducer, power gate control unit, and power gate to connect electromagnet winding to power supply.

EFFECT: higher efficiency of damper.

3 dwg

FIELD: transport.

SUBSTANCE: invention relates to machine building. Suspension comprises main flexible element 2 and additional flexible element fitted inside the former and aligned with it, additional flexible element representing hollow plunger 4 divided by piston 5 into two spaces. Rod 6 is fitted in cover 3 of main flexible element 2. Plunger bottom space is communicated via channel 7 and gas feed electrically driven air valve 8 with receiver 9 at the start of every compression stroke and with atmosphere in rebound stroke. Plunger bottom space is communicated via channel 10 and gas feed electrically driven air valve 11 with receiver 9 at the start of every compression stroke and with atmosphere in rebound stroke. Rod 6 of piston 5 is made solid. Switching devices (12, 13) of electrically drive air valve (8, 11) are controlled by control unit (14) that comprises transducer (15) of main flexible element travel and is connected with relative speed signal generator (16).

EFFECT: higher efficiency of damping.

2 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, primarily for vertical vibration dampers exploiting gas contained in elastic-wall chamber. Proposed suspension comprises main flexible element 2 arranged between spring and no-spring masses and extra flexible element 4 fitted inside the former and aligned with it. Flexible element 4 represents hollow plunger divided by piston 5 into two spaces. Plunger bottom space is communicated via channel 7 and gas feed electrically driven air valve 8 with receiver 9 at the start of every compression stroke and with atmosphere in rebound stroke. Electrically driven air valve supply circuit incorporates switching device 13 connected with speed transducer 12. Plunger top space communicates with atmosphere via axial 10 and radial 11 holes in rod 6 of piston 5. Rod 6 is fitted in cover 3 of main flexible element 2.

EFFECT: higher damping properties.

2 dwg

Hydraulic damper // 2388949

FIELD: machine building.

SUBSTANCE: damper consists of working cylinder wherein there is installed piston. The piston consists of two parts each containing channels bent at direct angle on its external surfaces; also the channels adjoin ribs. Each half of the piston is secured on separate rods by means of screw compression springs. The rods are movably installed one in another. The springs have opposite to each other coiling and linear and twist rigidity different by value. The said screw springs preliminary deformed by compression force are installed on the rods.

EFFECT: increased efficiency of damping vehicles oscillations.

2 dwg

Rubber cord shell // 2369786

FIELD: instrument making.

SUBSTANCE: invention is related to systems of shock absorption, vibration insulation, shock resistance and seismic stability. Shell comprises power frame and internal sealing layer of rubber. Power frame consists of two or more layer of rubbered cord. Cord edges are wrapped around board rings. Cover layer of rubber in shell is either absent or is present partially.

EFFECT: invention provides for improved reliability of operation and service life of rubber cord shell.

3 cl, 5 dwg

FIELD: mechanical engineering; transport engineering.

SUBSTANCE: invention relates to shock absorbing devices for damping vertical vibrations of vehicles using gas in chamber with elastic wall. Pneumatic suspension contains main elastic member installed between sprung and unsprung masses and additional elastic member installed inside main elastic member. Additional elastic member is made in form of hollow plunger divided into two spaces by piston. Rod space of plunger is connected by air channel through electropneumatic valve controlled by speed sensor and switching device to feed mass of mass of gas at beginning of each rebound stroke with receiver, and to bleed mass of gas into atmosphere at beginning of each compression stroke. Second space of plunger also communicates with atmosphere through hole in bottom of inner plunger. Rod of piston is secured in cover of main elastic member.

EFFECT: improved damping properties of pneumatic suspension, provision of control of its elastic damping characteristics over entire amplitude frequency range under external action.

3 dwg

FIELD: mechanical engineering; transport engineering.

SUBSTANCE: invention can be used for damping vibrations of vehicles. Proposed method of damping vertical vibrations of objects with pneumatic elastic members includes periodical reduction of restoring force of main pneumatic elastic element of suspension at beginning of each rebound stroke by delivering additional mass of gas to additional elastic member and subsequent removal of said gas mass at beginning of each compression stroke. Delivery of additional mass of gas to additional elastic member is provided from self-contained power source, for instance, receiver of vehicle, and subsequent bleeding of gas mass at beginning of each compression stroke into atmosphere is provided.

EFFECT: improved damping properties of pneumatic suspension, provision of control of elastic damping characteristics over entire amplitude frequency range under external action.

1 dwg

The invention relates to a device vibration protection technology and can be used in the suspensions of seats in vehicles to protect the operator from accidental fluctuations

The invention relates to vibration protection technology and can be used for protection of various objects, mostly of the human operator on the transport and technological tools

FIELD: machine building.

SUBSTANCE: anti-vibration platform consists of rigid frame, of floor and of flexible elements joining frame with base. The flexible elements are tied with the frame by means of hinged lever coupling the frame with a support element of a bumper. The bumper is equipped with flexible and damping elements and with a pendulum suspension all arranged in the case of the anti-vibration assembly. The case is formed with upper and lower bases rigidly connected to side plates and forming an aperture for projection of a bearing plate. With its one end the bearing plate is connected with the pendulum suspension, while with its another end it is connected with an object protected from vibration. An aperture for pendulum suspension rod passage is made in the upper base of the case. Diametre of the aperture coincides with diametre of internal cylinder surface of the damping element.

EFFECT: upgraded efficiency of vibration isolation and simplified design.

3 dwg

FIELD: machine building.

SUBSTANCE: anti-vibration system consists of at least four bumpers of different stiffness. A platform rests on two vertically arranged bumpers and of a bumping element. One bumper is installed over a free end of the platform and with another end it is attached to a lever. At least two bumpers are fastened to the lever on opposite sides relative to the free end of the platform. The bumping element formed with two axial cylinder sleeves is mounted on the opposite end of the platform. A pressure tight circular cavity is formed between external and internal sleeves. An upper part of the cavity is closed with a movable circular flange, while the lower one is closed with a circular washer. A circular piston with throttling holes is arranged in the circular cavity. The piston is hinged by means of at least three rods with the circular flange whereupon a spring rests. An upper base of the spring thrusts against a cover rigidly connected with a rod of the damper. A bushing is rigidly tied with the cover and operates as a guide for the spring. The rod is installed coaxially to sleeves. A lower end of the rod is connected with a vibration protected object, while an upper one is connected with the cover.

EFFECT: increased efficiency of anti-vibration in resonance mode.

3 dwg

FIELD: machine building.

SUBSTANCE: tuning to required damping frequency is performed. Dynamic rigidity or transfer factor dip is experimentally determined at first breadboard specimen. Then on increasing damper slit width, tuning frequency is increased along with increasing damping. Thereafter, tuning frequency is decreased by decreasing damper slit width. Aforesaid reduction is performed by increasing the number of slit pairs. Proposed device comprises interconnected pendulums pivoted to protected object. Each pendulum comprises weight suspended to aforesaid object. One object is located above the points of attachment of its suspension to the object, the others being located below aforesaid points. Tight cylindrical barrel is covered with cap and filled with hydraulic fluid. Movable modular hollow piston is arranged inside aforesaid cylindrical barrel fixed between two cylindrical springs. There is a system of channels inside aforesaid piston. It consists of top and bottom covers and uneven number of round plates. Aforesaid slits are formed by flat round rings arranged between aforesaid covers and plates. Former and latter comprise central bores, while even plates have peripheral orifices arranged nearby inner cylindrical surfaces of round rings.

EFFECT: higher efficiency.

2 cl, 3 dwg

FIELD: mechanics.

SUBSTANCE: support surface of rotor trunnion is made in the form of toroidal surface and installed on spherical support surface in cavity of support toe. The latter is installed on a damping element arranged in cavity of housing with lubricating liquid. Radius of toroidal surface of trunnion is 0.4÷0.95 of the radius value of spherical support surface of the toe, and distance between axial line of toroidal surface and trunnion axis is 0.05÷0.6 of the radius value of spherical support surface of the toe. Geometrical parametres of the support meet the ratio: , but not less than 1, where: r - radius of the toe sphere, m; ρ - radius of torodial surface, m; δ- distance between axial line of torodial surface and trunnion axis, m; P - axial load, H; F - radial load, H; β - slope angle of figure end from rotation axis under influence of radial load, rad.

EFFECT: increasing carrying capacity of support and decreasing costs for manufacturing and repairing thereof.

9 cl, 3 dwg

FIELD: mechanics.

SUBSTANCE: support surface of rotor trunnion is made in the form of toroidal surface and installed on spherical support surface in cavity of support toe. The latter is installed on a damping element arranged in cavity of housing with lubricating liquid. Radius of toroidal surface of trunnion is 0.4÷0.95 of the radius value of spherical support surface of the toe, and distance between axial line of toroidal surface and trunnion axis is 0.05÷0.6 of the radius value of spherical support surface of the toe.

EFFECT: increasing carrying capacity of support and decreasing costs for manufacturing and repairing thereof.

12 cl, 3 dwg

FIELD: mechanics.

SUBSTANCE: invention relates to machine building and is designed to absorb impact and vibration loads applied onto the base. The shock absorber incorporates an intermediate flexible-link weight arranged on the base and communicating with the damper representing a jet element with a cover and casing. The latter is furnished with tangential and axial channels, the latter communicating the aforesaid flexible link while the former communicates with the hydraulic-and-pneumatic accumulator.

EFFECT: higher damping efficiency.

4 dwg

Damper // 2313012

FIELD: mechanical engineering.

SUBSTANCE: invention relates to devices for suppressing mechanical vibrations of rotary systems. Proposed damper has housing and main movable element installed in housing filled with damping liquid. Main movable element is made in form of solid of revolution, is furnished with additional damping element and is hinge-rested by lower part through support needle and step bearing onto elastic member. Alignment springs are secured in upper part of main movable element. Additional damping element is fitted with damping clearances in ring groove of housing, it encloses main movable element and is connected to main movable element through elastic hanger whose vertical arrangement depends on adjustment of damper in frequency.

EFFECT: increased efficiency of damping and enlarged range of frequency damping in radial direction, provision of additional damping in axial direction.

10 cl, 9 dwg

FIELD: mechanical engineering.

SUBSTANCE: fluid-operated shock absorber comprises intermediate mass with flexible link made on high-pressure hoses. The intermediate mass is mounted on the high-pressure hoses connected with the vibration damper. The vibration damper has check valve and controlled throttle connected in parallel with the fluid accumulator.

EFFECT: expanded functional capabilities.

2 dwg

FIELD: mechanical engineering.

SUBSTANCE: damper comprises housing mounted in its space filled with damping fluid, main movable member made of a rotation body and provided with additional damping member, bearing for the rotor, and centering springs secured in the top part of the main movable member pivotally connected with the bottom part through the bearing needle and bearing thrust. The additional damping member is connected with the main movable member and is set in the groove in the housing that defines damping spaces around the additional damping member.

EFFECT: expanded functional capabilities.

6 cl, 5 dwg

Damping unit // 2292500

FIELD: mechanical engineering.

SUBSTANCE: damping unit comprises housing with a space filled with viscous liquid and movable vertical member submerged in the liquid. The top section of the movable member receives pivot for the end of the rotor shaft and ends of the centering springs. The other ends of the centering springs are secured to the housing. The bottom section of the movable member is mounted on the pivot of the flexible diaphragm whose periphery is secured to the housing. The damping member is connected to the diaphragm and interposed between the diaphragm and bottom of the space.

EFFECT: expanded frequency band of damping.

12 cl, 2 dwg

FIELD: mechanical engineering.

SUBSTANCE: device comprises mechanism of carrying the reciprocation of the power plant and balancer. The carrying mechanism is made of a rod with double-action piston. The double-action piston is mounted in the oil chamber and rigidly connected with the working rods of the power plant. The balancer is made of cylindrical bushing set on the side surface of the double-action piston of the carrying mechanism. The balancer is also in a contact with the inner surface of the oil chamber for permitting rectilinear reciprocation under the action of the oil pressure in the direction opposite to that of the rod of the carrying mechanism.

EFFECT: simplified structure and enhanced reliability.

1 cl, 2 dwg

Damping unit // 2292499

FIELD: mechanical engineering.

SUBSTANCE: damping unit comprises main damper and additional damper. The main damper is provided with movable member having bearing for the flexible support of the rotor and centering springs mounted in the top section. The damper is pivotally mounted in the tank filled with damping fluid. The additional damper has damping step cylinder whose bottom section of greater diameter is mounted in the space filled with damping fluid, and top section of smaller diameter receives the adjusting ring that embraces the semiaxle of the flexible support with a spaced relation. The damping cylinder is suspended in the space by means of additional centering springs secured to the top section of smaller diameter.

EFFECT: enhanced damping.

19 cl, 12 dwg

Up!