This paper details the no-load step peculiarity simulation,which uses the Jingmen electric power plant 6 genetor as an example,analyses the influence from avr parameter on the generator no-load step peculiarity,this study mainly aims at choosing a correct mathematical model in the excitation system medeling.

Application of having step characteristic bifurcation valve was explained in the paper.

Elastic-plastic dynamic response mechanism of a variablecross-section cantilever beam subjected to step load;

Deformation mechanism and energy dissipation of an elastic-plastic cantilever beam subjected to step loading;

The thermal transient behaviour of the thrust bearing under a step load was studied by use of one-dimensional adiabatic thermal model.

Through simultaneously considering geometric non-linear and material non-linear,the dynamic responses of single-layer spherical latticed shells subjected to harmonic loads and step loads were researched respectively,and the most unfavorable dynamic loads of the structure were analyzed.

This paper mainly focuses on dynamic response analysis of single-layer spherical shells subjected to harmonic loads, step loads and earthquake excitation, thereafter some important conclusions are drawn, such as those about the most unfavorable loads, the collapse type and the failure mechanism.

The method to study the dynamic stability of frame structure by time-history analysis is discussed in this paper,and an example for a frame under step load is given.

Use the throttle speed governing system with by-pass oil way in which the hydraulic cylinder was the executive as research object in this thesis , the trial research about the effect on the pressure p1 of the hydraulic cylinder chamber without piston-rod when series-connecting throttle or timing valve on the by-pass oil way under the step load changing have made.

Used the metering-out control system in which the hydraulic cylinder was the executive element as research object in this thesis, the experimental research about the effect on the pressure P1, P2 of the hydraulic cylinder chambers when series-connecting throttle valve or governor valve on the return oil-line under the step load changing have made.