Advanced Materials Research Vols. 986-987

Abstract: This article presents some research of welding methods according to battery pack working requirements of new energy automotive, for meeting the battery pack processing of new energy automotive in theory , single-sided duplex parallel resistance mass spot welding process is proposed.

Abstract: Put the finite element analysis of line tower coupling modeling to the collapse of a 110 kV line straight-line tower, study the effect of strong wind on transmission tower and wire. The results show that under the action of strong wind, the material specification selected by the part of the rods on the type of tower is lower, cross section is smaller, the principal material of tower will be instable and flexional under the compression, resulting in tower collapsed.

Abstract: To reduce the interference on communication equipments caused by transient electromagnetic field of switching operation, the shields of cables are connected to grounding grid on both sides in the substations grounding designs. However, when the substation is stroke by lightning or shorted, the huge potential difference called diverting potential difference between the cable core and the shield is generated, which can easily destroy insulation of cables, even producing electrical tree or dielectric breakdown in insulation material. Moreover, the large current flowing through the shield of cables will cause personnel accidents and equipment damages. In this paper, the electric model of cables is established using grounding grid simulation software—CEDGS. The way diverting potential difference changes influenced by grounding grids, soil and other parameters is analyzed. Measures to reduce diverting potential difference are proposed for providing a theoretical basis of construction in practice.

Abstract: In this paper, based on the modal analysis combined with power transformer product structure, using the empirical formula calculation method and finite element simulation analysis software calculates the natural vibration frequency of power transformer core, respectively, while making the VB language as a tool to develop the calculation software of natural vibration frequency of power transformer, provides a strong support for product tenders, design and optimization.

Abstract: As a kind of pollution-free and sustainable energy, solar energy has received people’s favor increasingly. Integration of solar power and architecture has become one of the important ways that people use solar energy. In this paper, numerical analysis of four frame-shear wall structure models on which PV panels are installed or not installed is conducted by ANSYS. The results show that integration of solar power and architecture meets the requirements of technical specification for concrete structures of tall building. But PV panels installed on the building surface will increase story displacement and produce stress and strain redistribution, which have negative effects on structural safety. This study provides a reference for the structure design of integration of solar power and architecture.

Abstract: Short circuit electromagnetic forces are one of the most important factors in design and operation of buses. 2D infinite element models are set up with ANSOFT for isolated phase buses, simulating with transient method and calculating short circuit electromagnetic force taking eddy effect and proximity effect into account. The result reveals that the maximum electromagnetic force under short circuit condition is a periodic function of current phase angle.

Abstract: The progression of power transformer core is usually determined by the core diameter and the width and thickness of the silicon-steel sheet is determined by the graphing method. Therefore, coil section can’t be fully utilized. To analyze the manufacturing characteristics of power transformer core columns from the performance and material savings and the nonlinear integer regression programming model is established. Taking the circumscribed circle diameter is 800mm, progression equal to 17 as an example. The optimized design of column section is solved by using the MATLAB. The results show that the optimized design can increase the cross-section fill factor by 3.8% and the diameter of the core columns larger, the optimization results better.

Abstract: In the traditional excavator, the slewing braking energy cannot be recovered and eventually became heat. As the hybrid technology was introduced into the hydraulic excavator, it makes energy recovery possible. In this article, a new energy recovery method based on hybrid, using an electric motor instead of a hydraulic motor to drive the swing mechanism. When braking, the electric motor will enter the generator mode and the energy will be recovered and stored in super-capacitors. This method has been proved to have high energy recovery efficiency.

Abstract: Under the pressure of fossil energy shortage, rational exploitation of ocean wave energy is propitious to establish an environmentally friendly society. This paper presents the results of a practical research done in a test tank, on the hydrodynamic performance of a wave energy converter with swing arms and floaters designed purposely. Fixed on a trailer, the converter was composed of two floaters, two swing arms, mechanical transmission devices and generators. The method of this research was to measure the floater’s acceleration and the output voltages of the generator under the movement of waves, analysis the influence of wave height and period on floaters’ movement, then compute the wave energy conversion efficiency. At last, the research findings show that the converter performed well with heaving motion performance and high energy conversion efficiency.

Abstract: HVDC converter station noise problem is getting attention by the relevant departments. The noise of converter stations is mainly generates by the converter transformers, smoothing reactor, AC and DC filter and valve outer cooling fan equipment, on this basis, the converter station noise control must be integrated into a variety of factors. In this paper, the noise source control, noise propagation route control and protection noise receptor were studied and explored.