Vol 15, No 2 (2021)
Articles
Comparative analysis of Russian and foreign regulatory requirements for vibration protection of a tractor operator
Abstract
Influence of the cross-sectional shape and length of the compressible sections on the characteristics of a linear peristaltic pump
Abstract
Development of methodology for calculation of optimal distribution of electric power between power units of condensing power plant
Abstract
Optimization methods are used to solve many problems in the field of energy. One of such tasks is the problem of optimal redistribution of power between power units in order to achieve minimum fuel consumption. This is especially important for powerful condensation power plants, where even relatively small fuel savings have significant economic effect.
The article is devoted to description of developed method of such optimization, based on the application of differential evolution, which has many advantages over the "classical" methods of optimization. In particular, it was the global rather than the local extremum of the objective function that could be found; it was also easy and powerful to use with modern software.
Differential evolution method is organized in the library SciPy of Python programming language, so calculation program was developed in this language to solve the problem. The work considers algorithm and structure of the developed program, as well as the procedure for preparing initial data and calculation process using example of a specific condensing power plant. Modules used in the program to populate the data arrays are mentioned, as well as to output the results in the form of high-quality graphs.
With the help of the program, diagram of the optimal redistribution of capacities between power units for any total capacity of the power station is constructed. Also, for entire power range of the power plant, nominal fuel consumption and fuel economy are calculated when implementing the optimal redistribution of capacity in comparison with an even distribution.
Obtained software product, available to everyone on the website of the authors, allows not only to study the practical application of differential evolution method, but also to create programs based on it to solve other optimization problems, some of which are mentioned in the article.
Study of the combined drive of the road train
Abstract
Investigation of the components of the cornering resistance of a tracked vehicle on a solid support base
Abstract
Selection of the characteristics of the suspension system of the high-speed tracked robot
Abstract
Optimization of transient processes of the pneumatic servo drive taking into account the friction model with the Stribeck effect
Abstract
Study of suspension systems for experimental tanks of the USSR in the second half of the 20th century
Abstract
Algorithm of anti-lock braking system for two-axle vehicles with one driving axle with adaptive redistribution of braking forces
Abstract
The main purpose of active vehicle safety systems is to prevent an emergency situation. If such a situation arises, the system independently (without the participation of the driver) assesses the probable danger and, if necessary, prevents it by actively intervening in the driving process.
One of the ways to increase the active safety of vehicles when braking is the use of anti-lock braking systems (ABS). The main problems in ensuring the operation of the ABS, built on different control principles and with different control parameters, are the impossibility of directly determining the vehicle speed and, as a result, the slip coefficient, as well as the inability to effectively respond to changing road conditions during braking. For example, when braking on a slippery supporting surface and trying to avoid an obstacle in front, there is a risk of losing traction and skidding. The algorithms of the ABS operation developed at present do not ensure the prevention of the occurrence and development of skidding under the conditions indicated above.
The aim of the work is to increase the stability and controllability of two-axle vehicles with one driving axle during braking due to the adaptive redistribution of braking forces on the wheels. An algorithm for the operation of an anti-lock braking system with adaptive redistribution of braking forces on the wheels of a vehicle is proposed. Thanks to this algorithm, when braking on a slippery surface of a two-axle vehicle with one driving axle, the absence of wheel blocking and also skid resistance are ensured. The efficiency and effectiveness of the proposed algorithm when braking a two-axle vehicle with one driving axle on a slippery supporting surface were proved by the methods of simulation.