According to the calculation principle of low-voltage power supply system,the paper analyzes the problems occurred during the calculation in low-voltage power supply design and puts forward to use the advantages of using new equipment and new technology,which solves the difficulties in power supply design.

Based on a discussion of some key problems in structural design,such as the constitutive relationship,element model,crack model,material strength,and load determination,the calculation principle,which should be followed in hydraul.

According to the calculation principle of low-voltage power supply system, the paper analyzes the problems occurred during the calculation in low-voltage power supply design and puts forward to use the advantages of using new equipment and new technology, which solves the difficulties in power supply design.

The measuring calculation principle and simulationof non-lens laser wire diameter measurement system;

The calculation principles, advantages and disadvantages of six models including calculation model for HMX/AP (1:1) burning rate, “Two Zone” steady combustion model,composite multiple-flame model,neural network model,free radical splitting model and semi-empirical prediction model of double-base propellant are introduced and evaluated.

According to secular construction experiences,it sums up a set of methods of using vertical curve to calculate circular curve,analyses the calculation principles of vertical curve,introduces the measure and set up steps of circular curve,discusses the application field of the method.

An approach to calculating principle and examples about the cost of production;