44 results about "Transient kinetics" patented technology

The invention discloses a method for reducing a transient impact load of a switch operating mechanism insulating pull rod and belongs to the field of high-voltage switch and digital simulation study. The method comprises a first step of establishing a transient dynamics finite element model according to a geometric model of a switch, implementing dynamic calculation of the high-voltage switch separating brake process, and extracting a transient impact load peak of the insulating pull rod; a second step of parameterizing a contact surface shape; a third step of performing design of experiment (DOE) calculation and sensitivity analysis; and a fourth step of utilizing an optimization algorithm to search an optimal reference point and producing an optimal spline. According to the method, impact stress generated on the insulating pull rod during switch motion can be effectively reduced, and switch reliability is improved.

The invention discloses a visual modeling method for simulating stress change of a building in a moving process, which comprises the following steps of: establishing a model for simulating the building moving by using ANSYS software, adding restriction and application conditions with different substeps according to the rail unevenness for carrying out transient kinetic analysis on the model, storing node displacements of substep analysis results; and establishing a three-dimensional solid model of the building moving by using 3DMAX (three-dimensional animation), endowing the material attributes, storing as an ASE (Active Seeker Electronics) format. Compared with the prior art, the invention can more accurately predict the position of a danger point of the building, greatly reduce the readdata volume, lighten the load of a CPU, highlighting key parts, and solve the problem of incontinuous read numbers by adopting a successive reading method and a segmented displaying method through defining a structure body and a map structure. Meanwhile, the successive reading method and the segmented displaying method are used for displaying stress change of the building, i.e. read displacement variable and color depth.

The invention discloses a derrick steel structure damage identification method based on an IMF (Intrinsic Mode Function) instantaneous energy curvature difference value. The method comprises the following steps of: carrying out modal analysis on a derrick steel structure to determine the low-order vibration modal of the derrick steel structure, and carrying out transient dynamic analysis on the derrick steel structure to extract the vibration responses of different positions of the derrick steel structure; utilizing a band-pass filtering method to extract the low-order vibration signals of different positions of the derrick steel structure, carrying out EMD (Empirical Mode Decomposition) decomposition on the low-order vibration signals to select main IMF components, and adopting a central difference method to calculate the IMF instantaneous energy curvature; and taking the IMF instantaneous energy curvature difference value obtained before and after the derrick steel structure is damaged as a damage sensitive index so as to realize the identification and the analysis of derrick steel structure damage positions and degrees. By use of the method, only the low-order vibration information of the derrick steel structure needs to be used for realizing damage position identification, identification accuracy is high, and the problem that the damage can not be accurately identified since large complex steel structure high-order vibration information is difficult in obtaining is solved.

The invention provides a radiation source generation system based on pulse periodical phase modulation. The radiation source generation system can be applied to research about the transient dynamic process. The radiation source generation system based on pulse periodical phase modulation comprises a nanosecond pulse laser, a 2*2 optical switch, an adjustable time delayer, a broadband phase modulator, a gain compensation amplifier, a preamplifier, a main amplifier, a pulse compressor, an ultra-short laser pulse sequence, a pulse electron beam and an X-ray source pulse sequence. A repetitive pulse shaping narrow band nanosecond pulse generated by the nanosecond pulse laser enters an annular cavity formed by the adjustable time delayer, the broadband phase modulator and the gain compensation amplifier through the 2*2 optical switch, circulates for multiple times in the cavity and then is output as a periodical linear chirp pulse sequence; the periodical linear chirp pulse sequence is amplified in the preamplifier and the main amplifier and then is compressed by the pulse compressor to generate the ultra-short laser pulse sequence, and the ultra-short laser pulse sequence interacts with the synchronous pulse electron beam to generate the X-ray source pulse sequence.