SU1456056A1 - Method of determining vibration-absorbing properties of loose materials - Google Patents

Abstract

The invention relates to agriculture, in particular to fodder production. The purpose of the invention is to increase accuracy and reduce costs. The method for determining the vibration-absorbing properties of a granular material involves the installation of a plate 1 with a main 2 and an additional 5 exciters on the material to be tested. The static moment of the shaft 6 with the unbalance of 7 additional vibration exciter 5 is less than the static moment of the main vibration exciter. The shafts 3 and 6 of the main and additional vibration exciters are brought into rotation and synchronize their rotation. Then the forced rotation of the shaft 6 is stopped and, after stabilization of the frequency of its rotation, the phase angle of movement of the shafts 3 and 6 is measured. (aa))) where a is the oscillation amplitude of plate 1; CO is the frequency of rotation of the main vibration exciter shaft; с — constant of the slab with vibration stimuli. 2 Il. (L

Description

The invention relates to agriculture, in particular to fodder production.

The purpose of the invention is to increase accuracy and reduce costs.

The method is carried out as follows.

On the test bulk material is placed a plate on which to install the main and additional vibration exciters. Each of them has a shaft with unbalance. A shaft with an unbalance of an additional exciter has a smaller static moment than a shaft with an unbalance of the main exciter. Drive the primary and secondary shafts into rotation and synchronize their movement. Then stop the forced rotation of the shaft with unbalance additional vibration exciter.

After stabilization of the rotation of the latter, the angle of phase shift of the main and additional shaft movements is measured; vibration exciters. At the same time, the amplitude of the plate oscillations is measured. The phase shift ot of the movement of the main vibration exciter shaft and the plates determine

according to the formula. g; / L

EC J - arcsin (c / (a-co} J,

where I is the measured phase angle of movement of the shafts of the main and additional vibration exciters;

a is the amplitude of the plate oscillations; O is the frequency of rotation of the main vibration exciter shaft; с — plate constant with exciters.

Figure 1 shows a device for determining the vibration-absorbing properties of bulk materials; figure 2 is water And figure 1.

The device contains a plate 1, on which an exciter 2 is installed with a shaft 3 and unbalance 4 and an additional exciter 5 with a shaft 6 and unbalance 7. On plate 1, circles 8 and 9 are fixedly aligned with shafts 3 and 6, and on the shafts are fixed Pointers 10 and 11. A stroboscopic lamp 12 is installed opposite the wheels 8 and 9. The shaft 3 of the vibration exciter 2 is electrically connected through the rotational speed sensor 13 to the lamp 12. The plate 1 is installed in the tank 14 for the material under study with the possibility of vertical reciprocating movement . The device works as follows.

e way.

The shafts 3 and 6 of the main 2 and an additional 5 exciters are driven into rotation and synchronize their movement. Then, the forced rotation of the shaft 6 of the additional vibration exciter 5 is stopped and, after stabilization of its movement, the stroboscopic lamp 12 is switched on. The frequency of the latter flashes corresponds to

5 the frequency of rotation of the shaft 3. Mark the division into circles 8 and 9, which are directed to the indicators W and P.

The difference in the values of the marked divisions indicates the phase shift angle of the shafts of the main and additional vibration exciters. Using the sensor 13, the frequency of rotation of the shaft 3 of the main exciter 2 is determined.

5 The oscillation amplitude of the plate is measured by known methods.

Claims (1)

Invention Formula 0 A method for determining the vibration-absorbing properties of bulk materials, including the installation of a plate with a unbalanced vibration exciter on the test material, the initiation of vibrations of the plate, the measurement of plate vibration parameters and the determination of the phase difference of plate vibrations and unbalance vibration exciter, characterized in that, in order to improve the accuracy 0 and reducing costs, an additional unbalance exciter with a static moment less than the main unbalance exciter is placed on the plate, forcibly synchronize the oscillations of the main and additional unbalance exciters, then stop the forced movement of the additional unbalance exciter after 50 of stabilization of the oscillations of the latter measure the phase angle of the oscillations of the main and additional unbalanced exciters, and the phase difference of the main unbalance movement 55 vibrator and plate oscillations ei, are determined by the formula cC "y- arcsin c / (a W), Y - measured phase shift angle oscillations of the main and additional unbalanced vibration exciters; a is the amplitude of the plate oscillations; frequency of oscillations of the main unbalanced vibration exciter; constant slab with unbalanced vibration stimulators. 1