High-Order Hybrid Finite Element Technology for Simulation of Large-Scale Array Antennas Embedded in Inhomogeneous Media

2004 ◽  
Author(s):  
Jianming Jin
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
Inhomogeneous Media ◽  
High Order ◽  
Hybrid Finite Element ◽  
Array Antennas ◽  
Finite Element Technology

Static Stiffness Optimization of Large Ram Based on Equivalent Elastic Modulus

2014 ◽  
Vol 621 ◽  
pp. 9-18 ◽  
Author(s):  
Feng He Wu ◽  
Xiao Peng Xu ◽  
Jun Wang ◽  
Jun Wei Fan
Keyword(s):  
Finite Element ◽  
Elastic Modulus ◽  
Large Scale ◽  
Optimization Procedure ◽  
Element Model ◽  
Heavy Duty ◽  
Static Stiffness ◽  
Stiffness Optimization ◽  
Finite Element Technology ◽  
Bending Load

The finite element model of heavy-duty machine tool’s ram components has a large number of elements, many contact pairs for assembly and a large-scale optimization calculation, which make the optimization difficult to conduct. To solve this problem, a static stiffness optimization method of the large component based on the equivalent elastic modulus is put forward. The proposed method is applied to super-heavy-duty CNC floor-type milling and boring machine of TK6932 as a case study. Based on the principle of the equivalent stiffness, the ram assembly with complex constraints and contacts is equivalent to a ram part without other components, the calculation method of the equivalent elastic modulus is analyzed and the equivalent elastic modulus formula of the ram under the bending load is derived. Taking the four box-walls’ thickness and the three stiffened-plates’ thickness of the ram as the optimization variables, the minimal volume under static loading as the target and the maximal displacement and stress as the constraints, the optimized mathematical model of the ram’s equivalent static stiffness is established. The results of the optimization are rounded according to the sensitivity analysis. Besides, the optimization effect is proved by simulation through the finite element technology. The optimization procedure and results show that the simplified method based on equivalent elastic modulus presented in the paper can control the calculation scale effectively, and ensure the process of the optimization smooth.

Application of Finite Element Software in Fatigue Analysis of the Welded Joints

2011 ◽  
Vol 337 ◽  
pp. 372-378
Author(s):  
Wen Xue Fan ◽  
Fu Rong Chen
Keyword(s):  
Finite Element ◽  
Welded Joints ◽  
Large Scale ◽  
Fatigue Analysis ◽  
Static Fatigue ◽  
Suitable Model ◽  
Finite Element Software ◽  
Welded Structure ◽  
Finite Element Technology ◽  
Vibration Fatigue

Based on the fatigue behaviors of welded structure and the distinction between static fatigue and vibration fatigue and sound fatigue, the general fatigue analysis methods of static fatigue and vibration fatigue are introduced in this paper, such as nominal stress method, structure stress method, hot stress method and power spectral density method. Especially application status and common software of finite element analysis are expounded and analyzed in fatigue analysis of the welded joint. In recent years, finite element technology is applied widely on analysis all kinds of welded joints, the main problems include two points, built suitable model and generated reasonable mesh. Nowadays, finite element software has many kinds of usage and different software has different functions. According to the stress analysis process of static fatigue and vibration fatigue, three large-scale general finite element software ANSYS, MSC.NASTRAN/PANTRAN and ABAQUS, some comparative analyses have been done in building model, partitioning mesh and applying method At last some important conclusions are given. Different finite element software has equivalent development background and reliable analysis performance. Different finite element software have different application platform. In order to get better analysis result, each other’s merits are drew from different software and matched with the application.

Complicated Super High-Rise Structural Model Conversion Technology

2014 ◽  
Vol 681 ◽  
pp. 187-194
Author(s):  
Xing Zhang ◽  
Qun Cheng
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Structural Design ◽  
Large Scale ◽  
Element Model ◽  
Simple Method ◽  
High Rise ◽  
Finite Element Technology ◽  
Design And Construction ◽  
Conversion Technology

Abstract. With the development of building science and technology, there are more and more super high-rise buildings. Meanwhile, difficulties in structural design and construction are also on the rise. As the finite element technology field develops, there are numerous types of structural design software, with different mutual functional characteristics. In order to satisfy the design and construction calculation of large-scale engineering, formats of different structural models shall be converted frequently, so as to satisfy the demand of design and construction calculation. In this paper, a simple method will be sought for converting the finite element model of SAP2000 structural design into ANSYS finite element model based on super high-rise structural design model by combining the practical engineering. After conversion, simple APDL [1] programming can be applied for realizing the conversion technology of model.

Torsional Vibration Analysis for Large-Scale Reciprocating Compressor Crankshaft

2013 ◽  
Vol 457-458 ◽  
pp. 428-432
Author(s):  
Ke Zhan ◽  
Xiao Ling Yu ◽  
Bin Yan Yu ◽  
Jia Xie
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
New Method ◽  
Reciprocating Compressor ◽  
Connecting Rod ◽  
Transient Stress ◽  
Finite Element Technology ◽  
Body Dynamics ◽  
Vibration Stress ◽  
Multi Body

This paper presents a new method which combined multi-body dynamics theory and finite element technology to calculate transient stress of the crankshaft of the large-scale reciprocating compressor. On the basis of multi-body dynamics theory, the kinematical simulation of the crankshaft, the connecting rod, the piston and other components were performed, and thus to get the vibration modal of the crankshaft. So we can judge whether the crankshafts torsional resonance will happen, as well as get the real loads on the crankshaft when it worked. Then the transient stress of the crankshaft can be calculated using finite element technology. Comparing to traditional stress calculating methods, this new method not only considers the variable inertia which caused by reciprocating masss movement, but also can calculate the integrated vibration stress of crankshaft in three directions, including torsion, lateral and axial. Therefore, this method can describe dynamic characteristics of the crankshaft more accurately and more entirely.

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