  The kinematic behavior of superluminal components observed at 43 GHz in
blazar 3C454.3 were model-fitted with their light curves interpreted in terms
of their Doppler-boosting effect. The relation between the flux evolution of
superluminal components and their accelerated/decelerated motion or the
increase/decrease in their Lorentz/Doppler factor was investigated. The
precessing jet-nozzle scenario previously proposed by Qian et al. (1991, 2018a,
2021) and Qian (2018b, 2022a, 2022b) was applied to consistently model-fit the
kinematic behavior and light curves for two superluminal components (B4 and B6)
measured by Jorstad et al. (2005). For both B4 and B6 which were ascribed
respectively to the jet-A and jet-B of the double-jet structure assumed for
3C454.3, their kinematic features were well model-fitted with their bulk
Lorentz factor and Doppler factor (as function of time) convincingly derived.
It is shown that the light curves of the radio bursts associated with knot B4
and knot B6 can be well explained in terms of their Doppler boosting effect.
Similarly, for the knot R3 observed at 15GHz (Qian et al. 2014, Britzen et al.
2013) the interpretation of its kinematic behavior and light curve is presented
in the Appendix. We emphisize that the interpretation of the flux evolution of
superluminal components combined with the model-fit of their kinematics is
important and fruitful. This kind of combined investigation not only can
greatly improve the model-simulation of their kinematics with properly
selecting the model parameters (especially the bulk Lorentz factor and Doppler
factor as function of time), but also their light curves can be well
interpreted in terms of their Doppler-boosting effect. Therefore, we can almost
completely (or perfectly) understand the physical nature of these components:
their kinematic/dynamic characteristics and emission properties.
