37results about How to "Increase test cost" patented technology

The invention discloses a method for solving the modal damping of a shaft system of a 1,000MW large steam turbo generator set based on an excitation injection stimulated torsional oscillation test. The method comprises the following steps of: exciting a special modal torsional oscillation signal domega from the shaft system by applying a precise modal frequency pumping signal; performing frequency spectrum analysis on the domega and performing time domain analysis on amplitude to acquire precise modal frequency; analyzing variation trend data of the excited domega signal amplitude in a time domain; performing logarithm least square fitting on the variation trend data of the domega signal amplitude in the time domain to solve a total damping level D under the test condition; setting up a systemic nonlinear simulation model by taking PSCAD as a platform; setting mechanical damping as 0 and recognizing the damping of a corresponding work condition, namely electrical damping De; and calculating the mechanical damping of the corresponding work condition, namely Dm=D-De. The method can be used for recognizing the damping level condition of the 1,000MW steam turbo generator set under various work conditions, particularly the mechanical damping of the set.

The present invention relates to a porous medium equivalent simplified model construction method for numerical simulation of tight reservoirs. It is based on the idea of ​​reducing the pore space of reservoirs through the synergistic effect of rock mineral particle compaction and cementation, and establishes a three-dimensional accumulation of dense porous medium sandstone particles. Simplify the geometric shape model; firstly, establish the tangent micro-elements of the sandstone particles with equal diameters; use the Rayleigh distribution function to characterize the sandstone particle size distribution, and establish the shape of large sphere accumulation combined with small sphere filling with the particle size obeying the Rayleigh distribution. The diameter and longitudinal random staggered arrangement constitutes a three-dimensional sphere packing model; the synergy coefficient is introduced to characterize the compaction of dense porous media and the influence of cement cementation on the pore shape; combined with the lattice Boltzmann simulation method to fit the synergy coefficient, the compactness Construction of 3D simplified geometric model of reservoir pore structure. The invention can reflect the differential characterization and alternate distribution of the geological origin of tight reservoirs and pore throats, and realize the porosity and seepage capacity.

The invention discloses a car door installation tool for simulating a car side impact test, which comprises an upper frame, an upper hinged seat, a cross rocker, a lower hinged seat and a lower frame. Mounting plates are installed at the upper and lower ends of the upper frame. A guide rod is installed, one end of the guide rod is installed with a welding block, one end of the guide rod is provided with a boss, the other end is provided with a thread, and a nut is installed on the thread, the guide rod passes through the cross rocker, the cross rocker and the upper hinge seat connection, the guide rod can slide up and down in the cross rocker, and the cross rocker can rotate around the upper hinge seat; the welding block is provided with a through hole, and a shaft is installed in the through hole, and the shaft is installed on the mounting block. At the same time, it is connected with the lower frame, the lower frame rotates around the axis, and the lower end of the lower frame is hinged with the lower hinge seat at the same time. The test trolley of the invention improves the simulation effect of the automobile side impact test, can accurately simulate the impact conditions of different parts of the dummy during the side impact, and reduces the test cost.

The invention discloses a method for performing a thermal compression test with a thermal simulation testing machine, which mainly solves the technical problem in the prior art that the deformation rate cannot be precisely controlled when the thermal compression test is performed with a general unit of the Gleeble 3500 thermal simulation testing machine. A kind of method that the present invention provides carries out thermal compression test with thermal simulation testing machine, comprises, 1) configuration Gleeble3500 thermal simulation testing machine equipment condition; 2) measure acceleration time t; The time t required to compress the minimum acceleration distance s of the hammer head under constant pressure and speed 1 and sample compression deformation time t 2 ; 4) Install the sample on the thermal simulation testing machine; 5) Carry out the compression deformation test in sequence; 6) Analyze the process data collected by the test. The method of the invention utilizes the general unit of the thermal simulation testing machine to realize the precise simulation of the technical parameters of thermal compression deformation.

The invention discloses a radiometer for performance in-situ test of a thermal control coat, which consists of a heat testing cavity, a test piece plate, heat detectors, a test piece plate strut, a heat testing cavity strut, a heat insulation cavity and a data acquisition base, wherein the heat insulation cavity is a test part of the radiometer and is supported by the heat testing cavity strut and placed inside the heat insulation cavity; the surface of the test piece plate is coated with the thermal control coat to be tested, and the test piece plate is supported by the test piece plate strut and placed inside the heat testing cavity; the heat detectors are film heat detectors and placed below the test piece plate and at the bottom of the heat testing cavity respectively; the heat insulation cavity is used for blocking thermal disturbance of spatial irradiation inside the heat insulation cavity; and a signal acquisition board card is placed in the data acquisition base. After the thermal control coat receives the irradiation of a simulated spatial environment, the change of temperature is detected by the heat detector, the change of thermal flux of the coat is obtained according to the change of the temperature, and the change of coat performance is calculated by using the change of the thermal flux. The radiometer has the advantages of simple structure, small time constant and high test precision, and can well realize the performance in-situ test of the thermal control coat in the simulated spatial environment.

The invention discloses a pillar impact tool and a test trolley for simulating a side impact test of a car, comprising a side door frame, a rocker hinge seat, a door frame fixed hinge seat, a cylindrical seat and a pillar impact installation base, and the cylindrical seat is installed on On the post strike installation base, there are side door frames on both sides of the post strike installation base. The side door frame is hinged with the door frame fixed hinge seat. The door frame fixed hinge seat is installed on the post strike installation base. Rod, the slide bar passes through the cross rocker, and the cross rocker is hinged on the hinged seat of the rocker. A pillar impact tooling and a test trolley for simulating a side impact test of a car according to the present invention can simulate the deformation of the car door under the working condition of an automobile side pole impact to the greatest extent, and cooperate with the test platform to standardize the test data of the real vehicle side pole impact , which greatly reduces the cost of the real vehicle test, and the structure is ingenious, the installation is convenient, and the test efficiency is improved.

The invention discloses a unified imaging method for a synthetic aperture radar (SAR) in four modes aiming at the strip SAR, bunching SAR, sliding bunching SAR and TOPS SAR. The problem that the prior art is limited by the modes of the SAR is mainly solved. The method comprises the implementation processes of (1) receiving echo data of the original SAR of a platform, and performing range Fourier transform on an echo signal; (2) performing fractional order Fourier transform twice on the echo signal, and performing direction scaling processing; (3) performing range migration correction on the echo signal, and compensating a phase curve into a straight line through a hyperbolic curve; and (4) performing the fractional order Fourier transform twice, realizing focusing imaging, and removing the residual phase. The SAR imaging in the four modes can be finished through simple parameter setting, different scene and resolution requirements can be met, and the imaging method is wide in application range and can be applied to the fields of ground mapping, target identification and the like.