Aim To establish the mathematical model of auto compensation pneumatic equalizer. Methods On the basis of existing formula of equalizer moment

caking accoant of the comprehensive influences of the angle of elevation and ambience temperature on the hand wheel force is establish the formula of the hand wheel force induding gas pressure in equalizeras a parameter. Results According to a certain howitzer

calculate the hand wheel force under different angle of elevation and ambient temperature

and analyze caculation. Conclusion On the basis of these analyses

the control system can be designed.