Research in Agricultural Engineering, 2003 (vol. 49), issue 1
Verification of continual measuring methodology of ammonia emissions in animal husbandry
A. Jelínek, J. Pecen
Res. Agr. Eng., 2003, 49(1):1-6 | DOI: 10.17221/4944-RAE
Measuring of the burden gases emissions within the agricultural activity is increasingly significant with respect to the international obligations of the Czech Republic. For the principal agricultural burden gas - ammonia - there was suggested and tested a continual measuring method including concrete, precise, single measurement for verification of its accuracy. In the paper are presented first results of measuring emissions from litter in chicken broilers farming.
A fine desintegration of plants suitable for composite biofuels production
J. Souček, I. Hanzlíková, P. Hutla
Res. Agr. Eng., 2003, 49(1):7-11 | DOI: 10.17221/4945-RAE
In case of pressed composite biofuels production the important part of the production process is the input row materials disintegration. In dependence on disintegrated material properties, disintegration device, grinding stage and technological process there is in practice necessary for disintegration of culm materials 0.5-7% and of wooden species even 0.75-10% of total energetical content of material. A wide range of these figures means that in this sphere of raw materials adaptation can be reached relative high savings through correct choice of technological process and device. The authors of the paper have measured energy consumption of fine disintegration...
Results of the development of biodegradable oils suitable for forest machines
M. Rousek
Res. Agr. Eng., 2003, 49(1):12-21 | DOI: 10.17221/4946-RAE
The paper is a response to the problem of the environment pollution by oil product spills from mechanisms of forest and agricultural machines. The problem can be dealt with through the replacement of mineral oils by biodegradable oils. Information concerning the measurement of parameters of these oils was published by the author. It has been demonstrated that the parameters are broadly suitable with the exception of thermooxidation stability. The paper is, therefore, aimed at improving the thermooxidation stability of biodegradable oils of HETG type. Oil raffinates based on rape oil, methyl esters are delivered in various quality, mostly with a service...
Anticorrosive efficiency of preservants for farming machinery
M. Augustin, M. ©čerbejová
Res. Agr. Eng., 2003, 49(1):22-26 | DOI: 10.17221/4947-RAE
Selected anticorrosion preserving agents were subjected to a comparison on the basis of tests made under operating conditions. Resistance of materials to corrosion markedly varies with operating conditions and impact of outer environment with the most important factors influencing the corrosion rate being SO2 content, temperature and humidity. Relative protective efficiency of preserving agents was assessed on the basis of weight losses of protected and unprotected samples. It was found out that the material's resistance to corrosion is significantly depending on warehousing conditions (SO2, temperature, humidity, etc.) and on...
Properties of threads created by thread inserts
J. Poąta, P. Veselý, T. Hladík
Res. Agr. Eng., 2003, 49(1):27-31 | DOI: 10.17221/4948-RAE
Several techniques are at disposal for production or repair of internal threads. The repair of threads by means of flexible thread inserts and the repair of threads by means of sold thin walled thread inserts belong to the most important ways. The properties of threads repaired using flexible and solid thin-walled thread inserts were experimentally verified and compared. Laboratory comparison of loading capacity of the threads according to observance of specified technological procedures was carried out. Durability and reliability of the repaired threads were verified in operation, while the threads endured long-time variable mechanical and temperature load.
Optimization of frameworks by means of fem use
J. Gaduą
Res. Agr. Eng., 2003, 49(1):32-36 | DOI: 10.17221/4949-RAE
The paper presents an application of an optimization procedure for a mass optimization of a welded framework of a special tractor trailer designed for transport of seeding machines. The used optimization procedure, so-called Fully Stressed Design (FSD), is based on an indirect approach utilizing optimum criteria. The aim of the optimization was to achieve the lowest possible mass of the construction taking into consideration the allowed resistance. As the paper shows, on the basis of the optimization procedure we achieved more than 35% savings of the material mass. In this way the optimization procedures have an important and unreplaceable role in...