Papers by Keyword: Simulation Analysis

Abstract: In order to study the nonlinear vibration problems of cable with a particular constraint, the mathematical model for the object of study should be established firstly with the elastic mechanics method. In order to obtain the mathematical model of differential form, the Galerkin method is used to make the mathematical model discrete and modal truncation, so the infinite dimensional solution space of the mathematical model can be transformed into the finite dimensional one. Main factors influencing the vibration of the cable system are analyzed, and the simulation analysis about the effects of various parameters on frequency is carried out. The analysis results show that the internal resonance modes may exist, and provide a theoretical basis for improving the safety and reliability of laying cables in actual conditions.

Abstract: Typical hydraulic systems with inertia executive components like hydraulic cylinders are generally low in damping and lack of stability. Adding DPD to systems is an easy and effectual method to solve these problems. The performance of a mechanical dynamic pressure feedback DPD applied in a common hydraulic system was simulated while the influences of the structure and system parameters on DPD and the system were analyzed. Further research on characteristic optimization was carried out by adding accumulators to DPD. It shows that the DPD can practically improve the system stability and contain the pressure impact. The accumulators should be set appropriately before the damping orifices and have a certain ability to absorb pressure impact.

Abstract: Peak reflectivity is a key reflected index of FBG, and it has great effects on the FBG application characteristic in sensing and communication fields. Theoretical and simulation methods are applied to study the cross influence of multiple parameters, such as grating length, grating pitch, and refractive index modulation depth, on FBG peak reflectivity. Research results can provide system recommendations for adopting proper parameter combinations according to practical manufacturing condition and actual demands.

Abstract: This paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Baochuan reinforced concrete rectangular section beam-supported aqueduct. Researching variation law of the aqueduct’s stress and displacement in construction process and operating process. Analysis results show that, structure of Baochuan reinforced concrete rectangular section beam-supported aqueduct is reasonable, it meets the requirements for engineering.

Abstract: Overpass is the important part of urban transportation infrastructure. This paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Longhai railway separate overpass. Researching variation law of the overpass’s stress and displacement in construction process and operating process. Analysis results show that, structure of Longhai railway separate overpass is reasonable, force of overpass structure is explicit, it meets the requirements for engineering.

Abstract: Asymmetrical accumulative rolling-bond was a new method to achieve AZ31 magnesium alloy sheet. The stress behavior of AZ31 magnesium alloy sheet asymmetrical accumulative rolling-bond was studied by simulation analysis. Test results show that the deformation resistance has a significant reduction in composite rolling, compared to the simple accumulative or asymmetrical rolling alone. And asynchronous ratio of two rolls was discussed in relation to deformation resistance.

Abstract: In order to solve the process of fishing, hull has significant heave motion under the influence of marine environment, that caused towing tension instability and fishing low efficiency problems, proposed and developed based on the hydraulic cylinder and the accumulator between the energy conversion and PLC control of towing tension range controllable passive compensation device. According to its working principle, the passive compensation device of compensation system and control system was designed, using the hull heave motion as the control energy, hydraulic cylinder and accumulator combination as a compensation system, selects PLC224CPU and M235 expansion module as the control unit. Finally, the towing tension range change of compensation has carried on the simulation analysis, the simulation results show that the passive compensation device which can realize the adjustment and control of drag tension range, achieves the expected control effect.

Abstract: Based on the problem of tunnel running through bridge pile foundation, a 3d numerical model is built by the finite element software MIDAS/GTS in order to research the internal force and the displacement of the pile and soil during the Construction process. The sedimentation value of the top of the pile is bigger than others. Because the bigger thrust about the Shield machine, the horizontal displacement of the pile is increasing at first and decreasing at last from a positive into a negative. Because of the loss of the soil, the soil beside the pile collapses and causes strong friction force. The surface sedimentation value which is near the central line of the tunnel is bigger than other place. This paper is of good reference roles in the similar underground engineering in Dalian.

Abstract: Aimingto improve the shortcomings of the AMD control system, new direct drivingactive mass driver (DAMD) is developed.The mathematical models of hydraulic power mechanismand hydraulic actuator of DAMD are set up, which leads to the whole equation ofrotation speed-drive force is constructed and the rotational speed of the pump(the driving voltage of servo motor) as input and the active control force asoutput is used. From the above derivation and analysis, the state equation forcontroller structure-DAMD control system is presented. Numerical analysis iscarried out on the structure responding control of the DAMD control system structurewhich is a top designed study object under earthquake load action. Results showthat in some degree,DAMD control system can be used to substitute thetraditional AMD control system for large-span structure to realized activecontrol of structural vibration.

Abstract: Based on design dimensions for particular concaves distributed non-smooth surface, the biomimetic brake disc/pad coupling system model is established, and the wear resistant performance of biomimetic non-smooth surface brake disc/pad coupling system is simulated using finite element analysis, then compared with analysis result of smooth model. Result shows the Von Mises stress of biomimetic non-smooth sample is less than that of smooth sample, and the concaves improve the contact stress distribution in the contact area of brake disk and brake pad. Analysis results show that wear resistant performance of biomimetic non-smooth sample is better than that of smooth specimen.