Combined local ventilation control system in a livestock house

The productivity of cows depends on the temperature and humidity of the environment. On farms with the loose-box keeping of cows with local forced ventilation, it is advisable to control the environemnt according to the clinical and physiological indicators of the cows’ conditon. For this purpose, the authors conducted experimental studies to analyze the dependence of the heart rate and respiratory rate of animals on overtemperature and relative air humidity. The study focused on the dynamics of changes in the clinical and physiological parameters of animals under the influence of thermal and humidity factors in the form of a single step impact. To prevent heat stress in animals, it is proposed to control local ventilation according to the combined principle, where the animal acts as the object of control, and the controlled values are the heart rate and respiratory rate. In this system, the role of disturbing influences belongs to air temperature and humidity in the livestock building. At the same time, the temperature and humidity control circuit performs a safeguard function. The command factor making the control action in the steady state is proposed to be considered the product of the scaled deviations of the actual values of the heart rate and the respiratory rate from their normalized values. Based on the analysis results of the dynamic properties of the control object, the authors propose to form the control action according to the proportional-differential law, which requires a periodic rotation of the fans.

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