Dynamic damper

FIELD: machine building.

SUBSTANCE: invention relates to devices of vibroprotective technology and is provided for reduction of oscillation intensity of object connected by bearing resilient member with basis. Damper contains oscillator, control assembly, the first and the second speed transducer, executive setting, electrically connected to outlet of control assembly. Oscillator is implemented in the form of mass connected to object by resilient member. The first speed transducer is installed on object and is connected to the first outlet of control assembly. The second speed transducer is installed on the basis and is connected to the second inlet of control assembly. Executive device is implemented in the form of hydraulic cylinder with pin and rod. Over-piston and under-piston cavities of hydraulic cylinder are connected to the first channel with built-in electric valve and the second channel with built-in throttle. Electric valve is electrically connected to outlet of control assembly. Hydraulic cylinder is pivotally fixed on object. Rod is pivotally fixed on the basis.

EFFECT: increasing the efficiency of object vibroprotection.

2 dwg

 

The proposed dynamic damper relates to a device vibration protection technology and can be used in vibration protection systems of vehicles, in particular in the suspensions seats tractors, road and agricultural vehicles to protect the operator from accidental fluctuations.

Known dynamic damper [1], designed to reduce the intensity fluctuations of the object connected to the supporting elastic element with a base containing an oscillator, connected to the elastic element with the object, the control unit and the Executive body, electrically connected with the control unit.

In this arrangement, the dynamic damper has no sensors for tracking a component of the state system of protection against vibration - velocity of the object and the base. Without the relevant information, the dynamic damper may not generate an optimal compensatory effects that reduce the intensity fluctuations of the object. Optimal compensation effect is realized only in the case of stationary out-of-phase oscillations of the oscillator and the base, when the amplitude of oscillation of the oscillator reaches a sufficiently large value.

Closest to the proposed technical solution is the dynamic damper [2], designed to reduce the intensity of the vibrations is the second object, United bearing elastic element with a base that contains the oscillator, made in the form of mass associated with the object by the elastic element, the control unit, the first speed sensor mounted on the object and connected to the first input of the control unit, and an Executive body, electrically connected with the output of the control unit.

The disadvantage of this dynamic damper is that the compensation effect is formed without using information about the components of the state Foundation. Executive body, which is installed between the object and the oscillator, blocking oscillator relative to the object on and off from the dynamic damper on the first and second resonant frequencies of the system, i.e. when the frequency of forced vibrations of the base coincides with one of the natural frequencies of the system. Since the mass of an object is much greater than the mass of the oscillator, the intensity of vibrations of the object together with the oscillator at a first resonance frequency decreases slightly. In addition, the compensation effect is formed only under the action of the restoring force of the elastic element, i.e. without taking into account dissipative forces. It is not possible to provide the required maximum value of compensatory effects on the intervals of movement, where the movement of the object is otnositelno base a little.

All this affects the quality indicators of the dynamic damper device as vibration protection technology.

The problem to which the invention is directed, is to increase the efficiency of protection against vibration of the object due to the formation of the dynamic damper optimum exposure compensation as the sum of two component - restoring force and dissipative forces, taking into account the information about the components of the state system of protection against vibration - velocity of the object and the base.

This dynamic damper that is designed to reduce the intensity fluctuations of the object connected to the supporting elastic element with a base that contains the oscillator, made in the form of mass associated with the object by the elastic element, the control unit, the first speed sensor mounted on the object and connected to the first input of the control unit, and an Executive body, electrically connected with the output of the control unit is further provided with a second speed sensor mounted on the base and connected to the second input of the control unit and the actuator is made in the form of a hydraulic cylinder with a piston and rod above and podpisniye cavity of the hydraulic cylinder is connected the first channel with built-in solenoid, electrically connected with the output of the control unit and the second Caen the scrap with integrated inductor moreover, the hydraulic cylinder is pivotally attached to the object, and a rod pivotally attached to the base.

The invention is illustrated by drawings. 1 shows a General view of the dynamic damper is installed in the vibroprotection system: an object - carrying elastic element base; figure 2 shows graphs of the vibrations of the object and the base when the kinematic perturbation, as well as graphs of compensation effects.

The dynamic damper includes an oscillator 1, the Executive body 2, the control unit 3, the speed sensors 4, 5 and the arms 6, 7.

The oscillator 1 is made in the form of weight 8, which is connected to the elastic element 9 with the bracket 6.

The Executive body 2 made in the form of a hydraulic cylinder 10 with a piston 11 and piston rod 12. Over - and podpisniye cavity of the hydraulic cylinder 10 is connected by channels 13 and 14. In the channel 13 has a built-solenoid 15, and in the channel 14 has a built-throttle 16. The hydraulic cylinder 10 is pivotally mounted on the bracket 7, and the rod 12 pivotally mounted on the bracket 6.

The speed sensor 4 is mounted on the bracket 6 and is connected to the first input of the control unit 3. The speed sensor 5 is mounted on the bracket 7 and is connected to the second input of the control unit 3. The solenoid 15 is electrically connected to the output control unit 3.

The bracket 6 is fixed on the object 17, and the bracket 7 on the base 18. The object 1 is connected to the base 18 by means of bearing of the elastic element 19.

In the position of static equilibrium of the object 17 on the raw elastic element 19, or in case of equality of displacements of the object 17 and the base 18 (when x-y=0), the piston 11 is located in the middle part of the hydraulic cylinder 10.

On the headways and...and...e the object 17 and the weight 8 of the oscillator 1 move in antiphase. While restoring force of the elastic element 9 forms a compensatory effect Pdthat through the bracket 6 is transmitted to the object 17 and seeks to shift it to the position of static equilibrium.

On the interval of movement and...with the object 17 and the base 18 draw near to each other, and their relative speed is negativeand on the interval of movement...e they are removed from each other, and their relative velocity is positive.

The speed sensor 4 converts the vibrations of the bracket 6 into an electric signal u1which is proportional to the speed of the object 17. The signal u1is fed to the first input of the control unit 3.

The speed sensor 5 converts the vibrations of the bracket 7 into an electrical signal u2which is proportional to the speed of the base 18. The signal u2is applied to a second input of the control unit 3.

By means of the control unit 3 signals u1and u2compare snakey value. The information obtained in the form of a signal.

served with output control unit 3 to the solenoid 15.

On the interval and b...the speed of the object 17and the relative velocitytherefore , the control unit 3 generates a signal u=u0under the action of which the valve 15 closes the channel 13 and engages the Executive body 2. The working fluid of the hydraulic cylinder 10 is extruded from its podpornoy cavity in nadporshnevaya cavity through the channel 14. When the throttle 16, the built-in channel 14, generates a dissipative force, which is transmitted through the piston 11, the piston rod 12 and the bracket 6 on the object 17. This dissipative force, as a compensatory effect Pudirected against the movement of the object 17 and reduces its speedin absolute value.

Because the range of motion and...b displacement x and velocityobject 17 is negative, then the compensatory effects of Pdand Pudevelop and determine the optimal compensation effect Pk=Pd+Pu, upward.

In the interval b...with the speed of the object 17and the relative velocitytherefore , the control unit 3 generates a signal u=0, under the action is receiving which the solenoid 15 is de-energized and opens the channel 13. The working fluid of the hydraulic cylinder 10 flows freely from his podpornoy cavity in nadporshnevaya cavity through the channel 13. As a consequence, the Executive body 2 is turned off from work, and the compensation effect Pu=0. Thus, on the interval of movement b...is formed with a compensatory effect Pk=Pd, upward.

In the interval c...d the speed of the object 17and the relative velocitytherefore , the control unit 3 generates a signal u=u0under the action of which the valve 15 closes the channel 13 and engages the Executive body 2. The working fluid of the hydraulic cylinder 10 is extruded from its podpornoy cavity in nadporshnevaya cavity through the channel 14. When the throttle 16, the built-in channel 14, generates a dissipative force, which is transmitted through the piston 11, the piston rod 12 and the bracket 6 on the object 17. This dissipative force, as a compensatory effect Pudirected against the movement of the object 17 and reduces its speedin absolute value.

Because the range of motion c...d the displacement x and velocityobject 17 is positive, the compensatory effects of Pdand Pudevelop and determine the optimal compensation effect Pk/sub> =Pd+Puaimed down.

On the interval d...e the speed of the object 17and the relative velocitytherefore , the control unit 3 generates a signal u=0, under which the solenoid 15 is de-energized and opens the channel 13. The working fluid of the hydraulic cylinder 10 flows freely from his podpornoy cavity in nadporshnevaya cavity through the channel 13. As a consequence, the Executive body 2 is turned off from work, and the compensation effect Pu=0. Thus, the movement interval d...e is formed compensatory effect Pk=Pdaimed down.

Upon further movement of the object 17 and the base 18 describes the sequence of operation of the dynamic damper is repeated.

Describes the sequence of work of the Executive body 2 together with the oscillator 1, if there is information about the components of the state system of protection against vibration - velocity of the object 17 and the base 18 provides a dynamic damper compensation exposure as the sum of the restoring force of the elastic element 9 and dissipative forces, implemented by the throttle 16. Because of the unfavorable situation, when the dissipative force increases the speed of the object 17 to be excluded, this compensatory effect is optimal), the government increases the efficiency of vibration protection.

This device allows to increase the efficiency of vibroprotection object, to improve the quality characteristics of vibration protection technology.

Sources of information

1. Copyright certificate 1469223, CL F16F 15/03, 1989.

2. The description of the utility model patent of the Russian Federation 48604, CL F16F 15/00 prototype.

Applicant: State educational institution of higher professional education "Omsk state technical University" (the Oryol state technical University)

A dynamic damper that is designed to reduce the intensity fluctuations of the object connected to the supporting elastic element with a base that contains the oscillator, made in the form of mass associated with the object by the elastic element, the control unit, the first speed sensor mounted on the object and connected to the first input of the control unit, and an Executive body, electrically connected with the output of the control unit, characterized in that it further provided with a second speed sensor mounted on the base and connected to the second input of the control unit and the actuator is made in the form of a hydraulic cylinder with a piston and rod above and podpisniye cavity a hydraulic cylinder connected to the first channel with built-in solenoid, electrically connected with the output of the control unit, and a second channel with a built-in the dross is eat, moreover, the hydraulic cylinder is pivotally attached to the object, and a rod pivotally attached to the base.



 

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