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Of the numerous applications of computers in agriculture induced by the overall advancement in IT and produced in response to the demand for cutting-edge agricultural technologies required to secure high quality products, one application which has become a classic and which definitely deserves a mention is numerical processing. A special place among numerical processing methods applied in agricultural...
In the recent years sandwich constructions, most often in the form of plates and shells, have been widely used in many fields of technology. Composite materials, due to their physicalproperties, are often used in agricultural buildings. Howewer the basic resistance parameters of these materials, which greatly influence the deformation of a plate under load, change in a random manner. The objective...
Accumulation of thermal energy involves three operational phases: loading, storage and unloading of a storage unit. All the three phases deal with heat transfer, and randomness is a pertinent feature of the process. In this paper an attempt was made to identify physical quantities contributing to the stochastic character of the thermal energy storage in a pebble bed. Probalistic models were developed...
Artificial neural networks, or neural networks for short, are a rapidly growing field of knowledge with applications in many areas of science. Their properties are ideal for many practical applicants. In order to demonstrate the scope for applications of neural networks in agricultural engineering, we have focused on one aspect of using such networks, which is to solve a regressive problem.
In performing their work in the field, tractor operators are exsposed to dust , noice and mechanical vibrations. The vibrations affecting the driver may be detrimental to human body organs. The objective of the project was a model of the tractor unit based on the side plane of the tractor. The presented model was designed to illustrate the vertical and pitch vibrations and to illustrate influence...
Jednym z najczęściej spotykanych w praktyce źródeł ciepła, wykorzystywanych w procesie ładowania kamiennego magazynu energii cieplnej, są baterie słoneczne. Urządzenia te, wykorzystując zjawisko fotoelektryczne, transformują energię emitowaną przez słońce, do postaci umożliwiającej jej efektywne magazynowanie np. w akumulatorach kamiennych. Ze względu na stochastyczny charakter zjawisk meteorologicznych...
Among the numerous of computers in agricultural technology, which results from the general development of computer technology and the demand for modern technologies in agriculture guaranteeing high quality of the final product, one cannot forget about the standard application of computers, i.e. computing. A special position among computing methods applied in agricultural technology is occupied by...
The sollar collectors take advantage of photoelectric energy to transform solar energy into a form effectively storable in e.g. pebble bed stores. Due to the stochastic nature of meteorological phenomena and the random character of electromagnetic wave propagation in the atmosphere (Sobczyk, 1982), one must consider the thermal parameters of the absorbed energy collected using the method to be random...
The efficiency of the system composed of a rock bed heat storage system depends on the degree of the non-uniformity of air flow through the rock bed. The subject of the article is focused on this phenomenon occurring in a horizontal rock bed heat storage system. The experiment was performed on a test stand where the velocity of the heat front was measured. The results were used to determine the relative...
A parallel processing algorithm was developed to salve transient, three-dimensional, quasi-linear transport problems in nonhomogeneous agricultural products of irregular geometry, and also to estimate uncertain coefficient values for the corresponding mathematical model. The algorithm was grounded on the inverse problem approach, optimization procedures, the mathematical model for the direct heat...
As a continuation of research on 'effective interacting diameter' in screw joints [4], the changes of this diameter for various materials and form of thread contours have been presented. The flat model of the interacting contours of thread (with the 'equivalent moment of inertia', in the current cross-section) was built and analysed by photo-elasticity method.
The paper presents the procedure which aims at the construction of a numeric algorithm of a multidimensional random function generator. As the suggested field of application is agricultural technology, the scope has been limited to functions in the form of a discrete Gaussian random field function (a two-dimensional geometric problem), whose values in the individual nodes show a certain level of correlation...
The driver of a farm tractor is exposed to vibrations generated by the engine, collisions with obstacles and the machines attached to the tractor. Kinematic analysis shows that operators of tractors with no trailer or semi-trailer attachments are exposed primarily to vibrations which are vertical and lateral relative to the direction of the tractor's motion. To account for the substanical differences...
Due to the distribution of the geometric dimensions of pebbles inside the heat storage system, the mathematical model describing the charging process of the above mentioned storage system must be verfied. Taking account of the stochastic nature of the parameters of the pebble bed in the calculations implies the occurrence random results. The paper presents the use of the numeric simulation technique...
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