SU1392417A1 - Device for vibration testing of articles - Google Patents

Abstract

This invention relates to a technique for vibration testing of articles. The purpose of the invention is to expand the operating frequency range of the device. To do this, in the device containing the vibration exciter 1, the movable part 2 of which and the table 3 for installing the test article 4 form an unconsolidated double piston pair with hydrofill 11, a spacer 9 of antifriction material is installed between the table and the movable part. The gasket provides a constant small thickness of the hydrofilling layer, as a result of which the upper limit of the operating frequency range increases. The lower limit is reduced by eliminating the elastic suspension of the table. From above, the movable part can be made in the form of an open container 8, and the upper part 6 is a pillar - in the form of a truncated cone, partially immersed in a hydraulic fill. The ends of the piston (cylinder) can be made conical. 3 hp F-Py, 3 Il. "Cl

Description

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The invention relates to a test apparatus, in particular to devices for testing test products for vibration.

The aim of the invention is to expand the operating frequency range.

Figure 1 shows the device with a partial longitudinal section; Figs, 2 and 3 - cylinder-piston pair, options.

The device for testing products for vibration contains vibration exciter I, preferably electrodynamic with sub-part 2, and table 3 for mounting the test article 4.

The lower central part of the table is made in the form of a cylinder 5, and the peripheral upper part 6 has a frusto-conical shape. The moving part 2 of the vibration exciter 1 near the axis of the device has the shape of a piston 7, and the upper part is designed as an open container 8. The cylinder 5 and the piston 7 form an unconsolidated cylinder piston pair, in the working space of which a spacer 9 is installed along the device axis, which is made of antifriction material and fixed on the pin 10, the ends of which are inserted with a small gap into the holes of the table 3 and the movable part 2. The area of the spacer 9 is less than 1% of the area of the piston. The working volume of the cylinder-piston pair and the chamber 8 are filled with hydraulic filling 11.

The end face 12 of the piston 7 may be made tapered with a top in the center of the end face 13 of the cylinder (FIG. 2). According to another variant, both ends 12 and 13 can be made conical with a common point for both cones (FIG. 3).

The device works as follows.

The test article 4 (FIG. 1) is mounted and fixed on the table 3 along the axis of the device. For precise alignment of the center of mass of the product and the axis of the device, the table 3 is provided with levels (not shown), when the vibration exciter 1 switches the moving part 2 back and forth. The GNP 11, closed in the working space of the cylinder-piston pair, has a high rigidity in the working axis of the device and in a wide frequency range of transmission 924

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There is a distortion key for each table 3 with test item 4.

In addition to the main climb (51 o reverse-translational motion, the movable part of the vibration exciter 2 also receives parasitic oscillations — lateral linear and angular. These oscillations are practically not transmitted to the table due to the fact that the sealer has high rigidity only in one direction — along the axis of the device, The spacer 9, made of an antifriction material, does not transmit lateral vibrations and, due to its small size and compliance of its material, does not transmit angular oscillations.

This ensures a strictly uniaxial movement of the table 3.

The peripheral part 6 of table 3, partially immersed in hydraulic filling 11, serves as a float supporting table 3 in a horizontal position, prevents the cylinder-piston pair from closing (touching piston 7 and cylinder 5). To increase the tilt angle of the table, at which emergency closure of the cylinder-piston pair is possible, without increasing the volume of the working space, the end face 12 of the piston 7 is made in the form of a cone with the tip on the end face of the cylinder 5. Both ends 12 and 13 can be made in the form of conical surfaces with a common top.

The installation of the remote gasket 9 provides a constant small thickness of the hydraulic fill layer 11 in the gap between the ends 12 and 13 of the piston 7 and the cylinder 5. This increases the resonant frequency of the hydraulic fill layer and the upper limit of the working frequency range. In addition, the presence of a spacer eliminates the need for an elastic table hanger in the known device, the final rigidity of which in the transverse direction limits the operating frequency range from below.

Claims (1)

1. Device for testing products for vibration, containing a vibration exciter, a table for installing the test product, forming with the movable part a vibration exciter a cylinder / piston 12/3 Rig.2 Fig.Z