SU998891A2 - Article dynamic testing method - Google Patents

Description

The invention relates to a testing technique, in particular to methods for testing products for the effects of dynamic loads.

According to the main author. St. 920425, a method of dynamic testing of products is known, which consists in the fact that by shock loading of each of consecutively arranged and elastically bound bodies, they are excited by their oscillations, and the product under test is installed on one of these temperature points 13.

The oscillations of bodies can be excited by synchronous or consecutive blows, as well as by unilateral or opposite blows. The levels of the amplitude-frequency components of the dynamic load acting on the test product are adjusted according to this method by changing the shock excitation forces of the body oscillations.

The disadvantage of this method is that it does not allow in a given system of elastic bodies to adjust the parameters of the amplitude-frequency components of the vibro-impact process by changing the influence of the masses of oscillating bodies on the body with the product, which limits the range of adjustment of the parameters of dynamic loading of the tested products.

The purpose of the invention is to expand the range of adjustment of the parameters of reproducible dynamic loads.

The goal is achieved by the fact that in the dynamic test method

10 products, which imply oscillations of successively arranged and elastically bound bodies by means of shock loading, on one of which a test product is squeezed, the test product is installed in turn on each of the bodies of different mass.

FIG. Figure 1 shows in principle a diagram of a device that implements the proposed method (a variant of exciting oscillations of elastically coupled bodies by blows of one-sided directionality); in fig. 2 - the same (variant of excitation of oscillations by impacts of the opposite direction).

The device comprises a base 1, to which bodies of 3, 4 and 5 different masses are suspended on flexible connections x 2,

30 interconnected springs

6 and 7, and on tillers 8 are fixed, the strikers 9, 10 and 11.

The method of dynamic testing of products is carried out as follows.

,

From the conditions for obtaining the specified frequency and amplitude characteristics of the vibration process, the masses of bodies 3, 4 and 5, as well as the stiffness of the springs 6 and 7 are selected. The test article 12 is installed on the body 3 with a smaller mass (Fig. 1) or on a body-5 of greater mass (Fig. 2)

The strikers 9, 10, and 11 deflect to given angles, which determine the magnitudes of the forces of the shock excitation of the oscillations of the bodies. 3, 4 and 5, and therefore the amplitudes of the frequency components of the vibro-impact process. In this case, the levels of influence of oscillating bodies on the body with the product depend on the mass ratio of the bodies.

With the simultaneous action of the strikers 9, 10 and 11 on the bodies 3, 4 and 5. Provide simultaneous impact on the product 12 of all. frequency components of the vibro-impact process, and in the case of successive strikes on the product, they are affected by the components of the vibro-impact process with preferential levels and frequencies of the excited bodies with a predetermined and time intervals.

The adjustment of the amplitudes of the frequency components is made by changing the angle of elevation of the corresponding strikers 9, 10 and 11.,

By carrying out synchronous strikes in the opposite direction, an increase in the initial deformations of the springs b and 7 is achieved, which allows. to expand the ability to control the amplitudes of the frequency components. The successive striking of the opposite direction ensures a change in the phases of the frequency-coupled vibro-impact process.

By installing the test article 12 on the body 3 of the minimum mass, provide increased levels of exposure to it and the test body of 4 and 5 large masses, and setting the product on the body 5 of the maximum mass, reduce the influence on it of oscillations of the bodies 3 and 4 of smaller masses.

When the test product is installed on the intermediate mass body 4, an increased effect of body oscillations 5 and a lower impact of body 3 are provided. Thus, when the test product is reinstalled on each of the elastically connected bodies 3, 4 and 5, the amplitudes of the frequency components of the vibro-impact process acting on the test product.

At this level, the influence of oscillating bodies on the body with the product depends on the mass ratio of 3, 4 and 5.

Using the proposed method of dynamic testing of products allows to expand the range of adjustment of the amplitude-frequency components of the dynamic load acting on the test product, which, in turn, expands the possibilities of studying the vibration and impact resistance of products during their testing.

Claims (1)

1. USSR author's certificate No. 920425, cl. G 01 M 7/00, 1980 (prototype). Th