Introduction. The problem of existing recorders of crane operation parameters in the direction of determining the intensity of work of mechanisms is revealed. The necessity of increasing the number of information sources is determined. Application of current parameters of the electric motor as a source of primary information is suggested.Materials and methods. The characteristics of the experimental setup are presented. The validity of information sources has been evaluated on the lifting mechanism. Formulas for determining the error of calculating the stator current and active power parameters and for determining the coefficient of proportionality of the load on the drive and the information parameter are given.Results. Tables and graphs of calculated mechanism load in terms of stator current and active power over the whole range of operating loads are presented. The dependence of accuracy of load determination on changes of supply mains voltage has been investigated.Conclusions. As information source of the load on the crane hoisting mechanism it is recommended to apply an active drive power. The given parameter has shown the big stability to voltage changes in comparison with a current of stator. It was possible to reach accuracy of definition of a load of 2,6 % at requirement of 3 %.
Introduction. This article describes an algorithm developed by the authors for the operation of a crane anemometer that measures the gust rate and average wind speed and determines the predicted wind speed on the basis of it. The main part. The main influencing parameters and their measurement intervals are defined for the construction of the anemometer algorithm. The method of calculation of gust velocity and average wind velocity from the data of the pulse sensor of the helicopter anemometer is presented. The method of wind speed forecasting based on the construction of an extrapolation function is given.Results. An anemometer program algorithm with extended capabilities relative to existing analogues has been developed. The instrument not only captures the hazard at the moment, but also predicts its future development. On the basis of the analysis of wind dynamics studies, a table has been compiled of the levels of the determined parameters (gust rate, average speed and projected average wind speed) and the signals given to the operator of the crane. For each type of signal, the value of the removal delay is defined.Conclusions. ZAO KROS Engineering and Technical Centre has made a prototype anemometer using the principles described in this article. The device meets all requirements of the regulatory and technical documentation. Further work on the improvement of the algorithm of its work will make it possible to increase the safety of technological processes carried out with the use of elevated structures.
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