Analysis to diagonal branches in a ventilating and air conditioning project for negative pressure isolation wards

Automatic identification of diagonal branches and automatic plotting of ventilation network characteristic graph are the particular functions of the simulation system.

Compared with similar achievements both at home and abroad, automatic identification of diagonal branches, network simplification and automatic plotting of ventilation network characteristic graph are the particular functions of the simulation system.

Based on the analysis to current mathematical model of diagonal branches automatic identification, by using the method of graph theory and set theory, a further study is performed, a serial of new concept correlative to the stability analysis of diagonal branches, such as key influence branch and non-key influence branches of diagonal branches, are put forward.

The present paper introduces a new method on easier identification of diagonal branches in a complicated mine ventilation network, in which a mathematical model of automatic identification is discussed emphatically.

Taking several kinds of typical diagonal link ventilated networks as the example in this article,analyzed the reverse condition of the airflow direction qualitatively,and discussed the application of diagonal branches in providing disaster relief in coal mine,it has an important meaning to ventilation management in coal mines,especially to the prevention and treatment of fire.

An investigation is reported in which a model based upon fabric geometry is developed to predict the thread volume fraction and elastic constants of three dimentional angle interlock fabric composites.