Research on the Correction of the Linkage Hydraulic System of the Composite Hydraulic Gripper Used in Coal Mine Rigs

The research against the defect that the gripper of the rig using a traditional linkage hydraulic system always clips back to damage drill pipes when the rig starts to rotate is presented. The correcting solution of a kinetic pressure feedback system including a damper and an accumulator is described by establishing the transfer function of the linkage system and analysing major factors making the gripper to clip back. Taking the ZYWL-4000SY automatic rig for instance, the linkage hydraulic system after correction is compared with that of before in simulating analysis and the correcting solution is verified by both lab and field tests. The results show that the corrected gripper works well without hurting pipes and the rig operates in good and stable condition. The theoretical foundation and method are provided to design and test the linkage function of the composite hydraulic gripper of other similar rigs.

The Absolute Deviation Rank Diagnostic Approach to Gear Tooth Composite Fault

Aiming at nonlinear and nonstationary characteristics of the different degree with single fault gear tooth broken, pitting, and composite fault gear tooth broken-pitting, a method for the diagnosis of absolute deviation of gear faults is presented. The method uses ADAMS, respectively, set-up dynamics model of single fault gear tooth broken, pitting, and composite fault gear tooth broken-pitting, to obtain the result of different degree of broken teeth, pitting the single fault and compound faults in the meshing frequency, and the amplitude frequency doubling through simulating analysis. Through the comparison with the normal state to obtain the sensitive characteristic of the fault, the absolute value deviation diagnostic approach is used to identify the fault and validate it through experiments. The results show that absolute deviation rank diagnostic approach can realize the recognition of gear single faults and compound faults with different degrees and provide quick reference to determine the degree of gear fault.

A Research of Uranium Ion Exchanging Tower Stress Calculation under Earthquake Based on ANSYS

Establish the finite element calculation (solid-liquid coupling) model of uranium ion exchanging tower with ANSYS. Time-procedure analyze the pillar of uranium ion exchanging tower with seismic waves. The wave form is EI Centro seismic with M=8.0, and the time interval is 0.02 seconds, lasts 30s.It is suitable for Class 1 site soil. Simulate the stress of two important welding position of uranium ion exchanging tower under the effect of the seismic wave. Compare the simulating results with the calculating results of Anti-seismic for Petrochemical Equipment to show that model simulating is similar to that of manual. Simulating analysis has proved that the maximum stress of two welding positions of the uranium ion exchanging tower is under the ultimate strength of tower welding, so the application of uranium ion exchanging tower in seismic zone meets the requirement of anti-seismic property. And this research provides the information of main risk positions for future entity analysis.

Back Analysis of Thermal Parameters of Mass Concrete and its Application Based on Micro-Genetic Algorithm

The value of thermal parameter is very crucial in simulating analysis on temperature control for mass concrete. The inverse analysis on some practical project is done by genetic algorithm and finite element method on the basis of observational data of temperature on the site. The temperature control simulation calculation is performed based on parameters obtained from inverse analysis on this project, so that the temperature distribution is consistent basically with the practical one. With improvement of micro-genetic algorithm, the genetic algorithm becomes globally-optimal by changing the optimal reserving and re-starting strategies. The results show this method is very practical in high precision of calculation in mass concrete parametric inversion.

Mathematical Model for Tension of Textile during the Process of Supercritical Fluids Spray Dyeing

The tension, caused by the high pressure jet when it`s sprayed on the textile, has obvious effect on the strength and dyeing quality of textile during the process of supercritical fluids spray dyeing. Based on the mechanical equilibrium of infinitesimal element, at the premise of considering the elasticity of textile, the parameter equations were built by introduced the transformation parameter. The internal tension and simplified deformation curve equation of textile were obtained by the Newton method. The simulating analysis may provide a theoretical basis and guidance for the actual process of supercritical fluid spray dyeing.

Study on the Strength of Textile during the Process of Supercritical Fluids Spray Dyeing

The deformation and tension of textile between two dyeing roller during supercritical fluid spray dyeing was studied in this paper. The parameter equations were built by introduced the transformation parameter based on the mechanical equilibrium of infinitesimal element at the premise of considering the elasticity of textile. The results show that the internal stress of textile is far less than the tensile strength of the fabric, and the operating parameters of supercritical fluids spray dyeing has obvious effect on the deformation of textile. The simulating analysis may provide a theoretical basis and guidance for the actual process of supercritical fluid spray dyeing.