This paper presents a continuum design sensitivity analysis (DSA) and optimization of high frequency radiation problems using the Energy Finite Element Method (EFEM) and Energy Boundary Element Method (EBEM). The noise radiated from the vibrating structure at a high frequency range is obtained through a sequential procedure. The structural EFEM calculates structural energy distribution, which i...

A novel enriched finite element method (EFEM) was employed to analyze the transient wave propagation problems. In present method, traditional approximation by employing appropriate interpolation covers. We mathematically and numerically showed that EFEM possessed important monotonic convergence property with decrease of used time steps for problems when unconditional stable Newmark integration ...

A design sensitivity analysis of high frequency structuralacoustic problem is formulated and presented. The Energy Finite Element Method (EFEM) is used to predict the structuralacoustic responses in high frequency range, where the coupling between the structural and acoustic domain are modeled by using radiation efficiency. The continuum design sensitivity formulation is derived from the govern...

The traditional finite element method (FEM) could only provide acceptable numerical solutions for the Helmholtz equation in relatively small wave number range due to dispersion errors. For large numbers, corresponding FE are never adequately reliable. With aim enhance performance of FEM tackling equation, this work an extrinsic enriched (EFEM) is proposed reduce inherent errors standard solutio...

Digital tomosynthesis (DTS) provides slice images of an object using conventional radiographic methods with high in-plane resolution. The objective of this study was to explore the potential of DTS for describing microstructural, stiffness and stress distribution properties of vertebral cancellous bone. Forty vertebrae (T6, T8, T11, and L3) from 10 cadavers (63-90 years) were scanned using micr...

Elastodynamic problems are investigated in this work by employing the enriched finite element method (EFEM) with various enrichment functions. By performing dispersion analysis, it is confirmed that for elastodynamic amount of numerical dispersion, which closely related to error from space domain discretization, can be suppressed a very low level when quadric polynomial bases employed construct...

Estimates of regional greenhouse gas emissions from agricultural systems are needed to evaluate possible mitigation strategies with respect to environmental effectiveness and economic feasibility. Therefore, in this study, we used the GIS-coupled economic-ecosystem model EFEM–DNDC to assess disaggregated regional greenhouse gas (GHG) emissions from typical livestock and crop production systems ...

Cloud occlusion phenomena are widespread in optical remote sensing (RS) images, leading to information loss and image degradation causing difficulties subsequent applications such as land surface classification, object detection, change monitoring. Therefore, thin cloud removal is a key preprocessing procedure for RS has great practical value. Recent deep learning-based methods have achieved ex...

This paper investigates the accuracy and convergence properties of augmented finite element method (AFEM). The AFEM is here used to model strong discontinuities independently underlying mesh. One noticeable advantage over other partition unity methods that it does not introduce additional global unknowns represent cracks. Numerical 2D experiments illustrate performance draw comparisons with del...

customer is the axis of organizations' activities and the mission of all modern organizations is based on the customer. quality as a concern and concept of management is defined in relation to customer satisfaction. regarding the common purpose of customer knowledge management and quality function development technique, this research is to evaluate automobile industry emphasizing the types of c...