SU1362990A1 - Low-frequency vibration stand - Google Patents

Abstract

The invention relates to a vibration technique and is intended for use primarily in the calibration of seismic receivers and other vibration sensors. The purpose of the invention is to increase the accuracy of playback of the specified vibration parameters and reduce the dimensions of the vibrations of the ostend. In a low-frequency vibrostand with a platform 2 lever device and an elastic suspension, the elements of which are made in the form of flat springs 4, the guide device contains at least two pairs, preferably four pairs, of levers 3. The levers of each pair are interconnected in the center elastic hinge 5, and the connection of their ends with the base 1 and the platform 2 is made through flat springs 4. The ends of the levers, located on one side of the hinge, are associated with the platform and the other with the base. Such a structure provides a low reduced rigidity of the suspension and the direction of the excited oscillations and high rigidity in the remaining directions. Due to the possibility of obtaining a low natural frequency when using springs of small dimensions, the dimensions of the vibrating table are reduced. 2 hp f-ly, 4 ill. (L with O5 bo o Jl / Fig. 1

Description

The invention relates to a vibration technique, in particular, to low-frequency vibration stands, which reproduce harmonic oscillations and are primarily intended for the calibration of geophones and other vibration sensors.

The purpose of the invention is to improve the accuracy of reproduction of the specified vibration parameters and reduce the size of the low frequency vibrator.

FIG. 1 shows a diagram of a low-frequency shaker; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows the node I in FIG. 2; in fig. 4 - section

BB in FIG. 3

I.

. The low-frequency vibrostand contains a base 1, a platform 2 for mounting a test article (not shown), a guide device in the form of at least two, in particular four, pairs of levers 3, one end of each of which is connected to the platform

2, and the other with the base 1, and the elastic suspension of the platform, made on flat springs 4, arranged parallel to the direction of reproducible vibrations. The levers 3 are installed on the four sides of the platform 2 and in the center are connected by an elastic hinge 5, and their ends are connected to the base 1 and the platform 2 via flat springs 4, and the ends of the levers located on one side of the hinge 5 are connected with platform 2 a d another is with base 1, the low-frequency shaker also contains a vibrator not shown on the drawings.

The low-frequency vibration trend-works as follows.

When the platform 2 oscillates, the levers 3 rotate around the hinge 5. Since the rigidity of all the springs 4 are the same, the increase in the distance between points A and B is compensated by the same deformation of the springs 4. Consequently, the platform 2 will oscillate strictly in the working direction (along the X axis on the diagram). Sun – CMI parasitic tilts of the vibrating table will be obstructed by elastic hinge 5 and springs 4, which have greater rigidity in the axial and transverse directions and relatively small rigidity in their working direction. The stiffness of the spring 4 in the working direction can be chosen sufficiently large, since it has little effect on the reduced rigidity of the suspension of the platform at small values of the angle if. Reduced stiffness C suspension platform is determined by the formula

C, 2 (2C, + CJ.

Oh

12

Where

. - the length of the lever 3; X is the amplitude of oscillations, Cd and torsional stiffness of hinges Au and C; C, - stiffness of the flat spring 4

in the direction of the levers. At О: Cf 6 ° stiffness of the flat springs in the direction of the levers, you can choose a sufficiently large, obeying at the same time low rigidity of the platform in the working direction and its high stiffness in the remaining directions.

The use of the proposed low-frequency vibrostand (unlike the known ones) allows one to reproduce strictly harmonic vibrations of large amplitude with small parasitic vibrations of the vibroplatform. Mala

the rigidity of the suspension makes it possible to use it in resonant vibrostands differing in much lower energy consumption. In addition, due to the possibility of obtaining a low natural frequency when using small springs, the dimensions of the low-frequency shaker are reduced.

Formula of Invention

Claims (3)

1. A low-frequency shaker containing a base, a platform for mounting the test product, a guide device in the form of levers, one end of each of which is connected to the platform, and the other end is connected to the base, and the elastic suspension of the platform, whose elements are made in the form of flat springs , characterized in that, in order to increase the accuracy of reproduction of given oscillation parameters and reduce overall dimensions, flat springs are arranged parallel to the axis of the excited oscillations, the guide device contains at least two pairs of lever in the levers of each pair ustanovleyy plane parallel to the mounting platform and pivotally coupled together at the center and the ends thereof communicating with 3 the platform and the base are made through flat suspension springs, while the ends of the levers located on one side of the hinge are connected one to the platform and the other to the base, 2. Vibrating stand according to claim 1, characterized in that it sent 1362990 The device contains four pairs of levers mounted on four sides of the platform. 3. Vibrating stand on the PP. 1 and 2, that is, in that the articulation of the levers is made by an elastic articulation. H n Compiled by V. Shekhter Editor A. Revin Tekhred L. Serdyukova Corrector V. Girn to Order 6393/30 Circulation 776 Subscription VNIIPI State Committee SSOR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 FIG.