RU2481504C2 - Antivibration system - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: proposed system comprises coaxial rod supporting elastic element and slide displacing vertically along said rod between stroke limiters. Levers accommodating compensating weights creating dynamic force are pivoted to springs. Dynamic force equals that of inertia originating in forced vibrations of bearing elastic element. Said dynamic force is transferred by said levers via slide to aforesaid rod to act at protected element in counter phase with the force of inertia that results in their compensation.

EFFECT: higher efficiency.

1 dwg

Description

The invention relates to transport engineering, in particular to means of protection against noise and vibration in a wide frequency range.

A known device "Dynamic vibration damper" (RF patent No. 49937, 2005, F16F 15/00) containing a supporting elastic element and additional masses installed between the vibrating and protected objects.

The disadvantage of the described device is the narrow frequency range at which it is effective.

Closest to the technical nature of the claimed device is a stiffener (AS USSR No. 1411216, 1986, B63H 21/30) containing a rod and a supporting elastic element located between the vibrating and protected objects, parallel to which springs mounted on vibrating object. The adjustment mechanism is made in the form of sliders mounted on springs with the possibility of slipping. The sliders are connected through prismatic knives to the stem of the protected object. There are travel limiters installed on the protected object.

The disadvantage of this device is the lack of elements to reduce the dynamic forces of inertia arising from the deformation of the bearing elastic element, directly proportional to the acceleration of the vibrating object.

The task of the invention is to increase the efficiency of vibration isolation by reducing the dynamic forces of inertia acting on the protected object from the side of the supporting elastic element.

The problem is solved in that in a vibration-isolating system containing a rod bearing an elastic element, springs, adjustment mechanism, travel stops, according to the invention, levers are installed with compensating masses located on their consoles and pivotally mounted to the springs and a slider moving along the stem between the travel stops .

During vibrations of a vibrating object in the supporting elastic element, forced vibrations with variable acceleration arise, creating a dynamic inertia force acting on the protected object and causing it to vibrate. To compensate for this force, the device includes levers containing compensating masses, the movement of which creates a dynamic inertia force acting on the protected object in antiphase. Thus, the total dynamic effect on the protected object, including the inertia force of the bearing elastic element, is compensated in a wide frequency range, limited by the natural frequencies of the device elements.

The drawing shows a General view of the device.

The device - vibration isolation system - is located between the vibrating 1 and protected 2 objects and contains pivotally connected rod 3 and bearing elastic element 4 located on the same axis. The adjustment mechanism is implemented in the form of a slider 5, which slides at a certain force along the rod 3 in contact with stroke limiters 6 and 7, mounted on the protected object 2. The travel stops 6 and 7 are simultaneously the guides of the rod 3. To the slider 5, the levers 8 and 9 are pivotally mounted, having spans AE and CE and cantilever parts AB and CD, on which the compensating masses (m) 10 and 11 are located. At points A and C, the levers 8 and 9 are pivotally attached to the springs 12 and 13, mounted on the protected object 2.

The device operates as follows. The vibrating object 1 generates vibrations in the vertical direction, which are transmitted through a rod 3 fixed to it and a bearing elastic element 4 pivotally attached to the rod 3, and through the slider 5 to the levers 8 and 9, which, under the action of the rod 3 vibrations, begin to make angular oscillations relative to the points A and C, driving the compensating masses 10 and 11, which are located on the cantilever departures AB and CD of the levers 8 and 9. The accelerated movement of the compensating masses 10 and 11 causes dynamic inertial forces transmitted to the protected object 2 along the springs 12 and 13. The total value of the arising dynamic inertia forces of the compensating masses 10 and 11 at any moment of the oscillation cycle is equal to the inertia force from the side of the supporting elastic element 4. Since these forces act in antiphase, the inertial effect on the protected object 2 is compensated.

To calculate each of the compensating masses, the following formula is used:

,

,

where m is the compensating mass - kg;

M - mass of the movable part of the spring - kg;

l ₁ - the length of the lever to the place of fixing the elastic element - m;

l ₂ - the length of the console extension of the lever - m

The proposed device has a simple design, reliable in operation and provides increased efficiency of vibration isolation in a wide frequency range by reducing the stiffness and inertia forces transmitted to the protected object from the side of the bearing elastic element.

Claims (1)

A vibration-isolating system containing a coaxially located rod, bearing an elastic element, a slider moving vertically along the rod between the travel stops, levers and springs, characterized in that levers having cantilevered parts are mounted pivotally to the springs, on which there are cantilevered parts calculated so that so as to create a dynamic force transmitted by the levers through the slider to the rod and then acting on the protected object, equal to the inertia force arising from forced oscillations existing elastic element, but acting in antiphase, which leads to their mutual compensation and, as a result, to increase the efficiency of vibration isolation.