Investigation of Characteristics of Contact Bandages and Support Rollers of Rotating Technological Drums

Shrubchenko, Ivan; Hurtasenko, A.; Sharapov, Rashid; Duyun, Tatiana; Shchetinin, Nikolay A.

doi:10.5539/mas.v9n1p195

Cited by 6 publications

(2 citation statements)

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“…After appropriate transformations, it can be represented as follows: (10) Assessing the contribution of individual components and after some simplifications, the expression (6) can be written as: (13) In the transition from one spectral component to another (ω i.. -ω it1 = ω t ) amplitudes of them will be maximum if: (14) After transformation the expression (9) A 2 can be represented as follows:…”

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Analysis of the spectrum distribution of oscillation amplitudes of the concrete mix at shock vibration molding

Sharapov

Vasiliev

2017

MATEC Web Conf.

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Abstract. In the production of concrete structures widespread shaking tables of various designs. The effectiveness of vibroforming concrete items largely depends on the choice of rational modes of vibroeffect to the compacting mixture. The article discusses the propagation of a wave packet in the concrete mixture under shock and vibration molding. Studies have shown that the spectrum of a wave packet contains a large number of harmonics. The main parameter influencing the amplitude-frequency spectrum is the stiffness of elastic gaskets between mold and forming machine vibrating table. By varying the stiffness of the elastic gaskets can widely change the spectrum of the oscillations propagating in the concrete mix. Thus, it is possible to adjust the intensity of the process of vibroforming.The theory and practice of vibratory compaction of concrete mixtures are still relevant in the production of concrete items and structures [1][2][3]. The main tasks in easel forming concrete items are the choice of effective modes of vibration effects and rational parameters of the shaking tables.Unfortunately, when using standard molding conditions of existing construction vibrating equipment does not meet modern requirements. This is due to their large resource consumption over the low quality of manufactured concrete items, low operational reliability, as well as the excess of admissible norms of noise and vibration [4,5].To compact firm concrete mix B. V. Gusev [6] developed the theoretical foundations of shock and vibration technology. Staff members of his school were created and installed equipment for implementing low-frequency modes forming concrete items [1,7]. In other works [8,9], as effective modes of compaction of firm mixes it is proposed to use the socalled asymmetrical shock-free oscillations. The advantage of applying these oscillations is the absence of oscillating vibrotable with the balancing frame.In articles [10, 11] described optimization of parameters of shock and vibration shaking tables for efficient modes of forming concrete items of firm concrete.It is interest to consider the process of propagation of a wave packet in concrete mix under shock and vibration effects on the mold and explore a range of pulses, which propagate in the mixture.

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“…It is known [13] that the spectrum of some almost periodic functions y(t) is determined by the formula:…”

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confidence: 99%