Through the numerical simulation of forced oscillation of liftbody by solving the (N-S) equations, the equilibrium gas effect on damping-in-pitch derivatives is investigated.

In this paper, the supersonic damping-in-pitch derivativesof blunt body were calculated with two methods: (1) harmonic perturbationmethod by solving Euler equations; (2) simulant viscous flow field by solving unsteady N-S equations.

Research on the modeling of pitching moment coefficient in transonic condition for flight vehicle;

In virtue of Fluent of CFD software,we carry though computation of aerodynamics of an air-to-air missile in different Mach meter and different attack angle and gained movement trend of lift coefficient、drag coefficient and pitching moment coefficient with variety of Mach number and attack angle,meanwhile,we also obtain distributing trend of pressure,temperature and weather velocity.

This paper analyzes the causes of DQ5030 bucker stacker reclaimer cantilever lifting failure,through analysis,we knows that the reasons are faults of the components of pitching system,and presents,the detection process of the components,and the inspection process according to the fault parts,to handle the bugs of pitching system.

Selection methods on damping coefficient,stiffness coefficient and time step in granular distinct element method;

Test research on roll damping coefficient of anti-rolling tank testing platform;

Comment on empirical formulas for calculating marine engine damping coefficient;

Influences of Bubbly Oil on the Damping Factors of Journal Bearing;

When well fluids are laminar or turbulent,the damping factor of the different eccentric rod string was calculated respectively.

The transfer function F(s) of the second-order type-2 loop filter is given,the stability and step response of the third-order PLL then presented,followed by a derivation of a proper damping factor.