Mathematical model of the operating process of a mower for mowing vegetation in the near-trunk strip

This article is devoted to a detailed description of the developed physical model of the pneumatic classification process for detecting the rotating suspended layer and ensuring the frequency of loading and unloading of a pneumatic classifier. The related mathematical model is developed for estimating the non-stationary concentration of fine particles in a gas-dispersed flow with respect to time and height of the working space of the apparatus. The research is aimed at developing a pneumatic classification method for granular materials using a rhomb-shaped apparatus and ensuring the reliability of the operating process based on the influence of the flow on the granular material concentrations. The obtained experimental results allow evaluating the rational geometrical parameters of the working space in pneumatic granulators, as well as verifying the proposed mathematical model based on the implementation of the quasi-linear regression procedure. It is shown that the rhomb-shaped pneumatic classifier provides effective separation of granular material, reaching up to 95% of the target fraction. As a result, the proposed methodology can be implemented for optimizing geometrical profiles of pneumatic classifiers in terms of defining the required technological parameters of the pneumatic classification process.

Download Full-text

Reliability Study of Aviation Equipment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.933.428 ◽

2014 ◽

Vol 933 ◽

pp. 428-433

Author(s):

Jun Li ◽

Qing Wei Dong ◽

Ye Zhan ◽

Xiang Bin Yu

Keyword(s):

Mathematical Model ◽

Failure Mode ◽

Failure Probability ◽

Operational Reliability ◽

Reliability Theory ◽

Reliability Study ◽

Model Average ◽

Operating Process ◽

Electrical Components ◽

Operational Time

It is well-known that reliability of equipment is the most important of all performance to all equipments. In order to make the equipments which include mechanical equipments, electrical equipments and so on work normally, reliability theory FMECA is applied in an aviation equipment to study its reliability and improve operational reliability of the product. Through its reliability mathematical model, average of operational time is predicted based on calculating failure probability of all electrical components. According to the process of FMECA, all kinds of the failure mode, reasons, effects and criticality of the products can be determined completely. By comparing these criticality data as shown, the paper analyses adopted method by that the contents, accents and operating process of maintenance may be instituted finally. FMECA-based method for reliability study of the equipment and the equipment maintenance perform well. The results indicate that application of FMECA method can analyze reliability in detail and improve operational reliability of the equipment. Therefore this will supply theoretical bases and concrete measures of maintenance of the products to improve operational reliability of products. FMECA can be feasible and effective for improving operational reliability of all equipments.

Download Full-text

Advanced mathematical model of fuel supply operating process and results of calculations of fuel supply parameters for diesel engine running on composite rapeseed-mineral fuel

E3S Web of Conferences ◽

10.1051/e3sconf/201912600005 ◽

2019 ◽

Vol 126 ◽

pp. 00005 ◽

Cited By ~ 1

Author(s):

Alexander Averyanov ◽

Evgeniy Rotanov ◽

Stanislav Vlasov

Keyword(s):

Mathematical Model ◽

Rapeseed Oil ◽

Sharp Decrease ◽

Theoretical Studies ◽

Theoretical Justification ◽

Fuel Supply ◽

Mineral Fuel ◽

Operating Process ◽

Composite Fuel ◽

The Mean

Results of theoretical studies are presented, their purpose was to assess the effect of heating of diesel composite fuel on cycle fuel supply and fuel pressure in the above-plunger space of a high-pressure fuel pump (HPFP). A refined mathematical model of the fuel supply process is described, which takes into account the concentration of rapeseed oil in composite rapeseed-mineral fuel and its physical properties, and theoretical justification of a method for determining the mean effective flow crosssection of nozzles and pressure fuel tubing is presented. The analysis results showed that with an increase in the concentration of rapeseed oil in composite diesel fuel and the revolution rate of HPFP camshaft at a temperature of 30 °C, a sharp decrease in the cycle fuel supply is observed which is smoother at heating. The same trend is observed with a change in the fuel pressure in the above-plunger space of HPFP.

Download Full-text