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10ТЕХНИЧЕСКИЕ НАУКИ
THE EFFECTS OF VIBRATION IN THE PROCESS OF PROCESSING A LIVING COCON Safarov Zh^.1, Dadaev G.^2, Samandarov D.I.3, Egamberdiyeva Z.4,
Shokirova O.5
1Safarov Zhasur Esirgapovich - Doctor of technical sciences, Dean; 2Dadaev Gani Toshhodzhayevich - Deputy Dean, FACULTY OF MECHANICAL ENGINEERING;
3Samandarov Doston Ishmuhammat ugli - Assistant, DEPARTMENT OF SERVICE ENGINEERING;
4Egamberdiyeva Zilola - Student;
5Shokirova Ozoda - Student, FACULTY OF MECHANICAL BUILDING, TASHKENT STATE TECHNICAL UNIVERSITY, TASHKENT, REPUBLIC OF UZBEKISTAN
Abstract: recommendations have been received on the use of infrared rays and elastic waves (vibrations) in the processing to obtain a high-quality product, reduce the time of carrots and drying, as well as save energy. Based on the results obtained, it can be stated that further improvement of the installation developed by the authors and acceleration of the carving and drying process when using hot air at a temperature of 65 °C for this, which with combinations of vibrations of 1 m/s2 for 2 minutes makes it possible to preserve the natural physical -mechanical and technological indicators of the cocoon shell. Keywords: vibration, drying, cocon.
Man lives in a world of elastic waves. He hears some of them, others he does not perceive at all with his hearing organ. But both audible and inaudible elastic waves play an important role in human life.
If in a continuous medium — gases, liquids, or solids — the particles of the medium are removed from the equilibrium position, then the elastic forces acting on them by other particles will return them to the equilibrium position. In this case, the particles will oscillate. The propagation of elastic vibrations in a continuous medium is a wave-like process.
Oscillations with a frequency from units of Hertz (Hz) to 20 Hz are called infrasonic; at a frequency of 20 Hz to 16-20 kHz, oscillations create audible sounds. Ultrasonic vibrations correspond to frequencies from 16-20 kHz to 108 Hz, and vibrations with a frequency of more than 108 Hz are called hypersounds [1-2].
Vibrational velocity is the speed of movement of a controlled point of equipment during its precession along the measurement axis.
In practice, it is usually measured not the maximum value of the vibration velocity, but its rms value. The physical essence of the parameter is the rms value of the vibration velocity consists in the equality of the energy impact on the machine supports of the real vibration signal and the fictitious constant, numerically equal in value to the rms value. The use of the value of the rms value is also due to the fact that before the vibration measurements were carried out by dial gauges, and all of them are integrating by the principle of operation, and they show exactly the rms value of the variable signal [1].
Of the two widely used in practice representations of vibration signals (vibration velocity and vibration displacement), the use of vibration velocity is preferable, since this is a parameter that immediately takes into account the movement of the controlled point and the energy effect on the supports from the forces that caused the vibration. The information content of vibration displacement can be compared with the information content of vibration velocity only if, in addition to the amplitude of the
oscillations, the frequencies of the entire oscillation and its individual components are taken into account. In practice, this is very problematic.
Vibration acceleration is the value of vibration, directly related to the force that caused the vibration. Vibration acceleration characterizes the force dynamic interaction of elements inside the unit that caused this vibration. Usually displayed by amplitude (Peak, Peak) - the maximum absolute value of the acceleration in the signal. The use of vibration acceleration is theoretically ideal, since the piezoelectric sensor (accelerometer) measures acceleration precisely and does not need to be specially converted. The disadvantage is that for him there is no practical development on the norms and threshold levels, there is no generally accepted physical and spectral interpretation of the features of the manifestation of vibration acceleration. It is successfully used in the diagnosis of defects having an impact nature - in rolling bearings, gearboxes [3].
Vibration acceleration is measured in:
• meters per second squared (m/s2);
• G, where 1G = 9,81 m/s2;
• decibels, the level must be 0 dB. If not specified, then the value is taken. 10-6 m/s2
Convert vibration acceleration to dB.
For a standard level of 0 dB = 10-6 m/s2:
AdB=20*lg10(A)+120;
AdB - decibel vibration acceleration;
lg10 - decimal logarithm (base 10 logarithm);
A - vibration acceleration in m/s2;
120 dB - level 1 m/s2.
The results of the process of the effect of vibration on the carrot and drying of silkworm cocoons are shown in Figure 1 [4].
The results of the process of the effect of vibration on the carrot and drying of silkworm cocoons are shown in Figure 1.
Fig. 1. The dynamics of the vibration velocity used in carrots and drying of silkworms
| 5 | CoBpeMeHHbie мнновацмм № 5(33) 2019
The figure shows the result of repeated experiments and the selected variation in the dynamics of vibration velocity, with which cocoons were fed during the carriage and drying of the silkworm.
Список литературы
1. Khmelov V.N., Slivin A.N., Barsukov R.V., Tsyganok S.N., Shalunov A.V. The use of high intensity ultrasound in industry. Alt. state tech. un-t, BTI. - Biysk: Publishing house Alt. state tech. University, 2010. 203 p.
2. Raj Baldaev Ultrasound Applications. M.: Publishing House Technosphere, Palanichi, 2006. 576 p.
3. [Electronic Resource]. URL: http://vibrocenter.ru/vibroacc.htm/ (date of access: 07.10.2019).
4. Safarov J.E., Sultanova Sh.A., Dadaev G.T. Primary processing of cocoons silkworm (Bombyx mori) procedure with the help infrared heating. 10th World conference on intelligent systems for industrial automation. WCIS-2018. Tashkent, 2018. Р. 396-400.
