This paper proposes an eco-design method to suggest improvements over an existing diaphragm forming process (DFP). In the proposed method, a systematic procedure is developed to provide eco-design guidance to engineers, and it includes four steps. In Step 1, design functions are analysed through functional diagrams to provide the information of sub-functions and functional flows. In Step 2, the eco-design requirements are captured via quality functional deployment (QFD) and then translated to design functions via functional analysis (FA). Then, the design functions are prioritized according to the eco-design requirements in considerations. In Step 3, the prioritized design functions are used to generate possible design concepts through the morphological chart. In Step 4, the generated concepts are assessed based on the energy use and process time of DFP. The utility of the proposed method is to adapt quality tools for continual improvements in the context of eco-design. An existing DFP is used for this work to demonstrate and validate the method’s applicability. The result of this research shows that the integration of QFD and FA can systematically guide the generation of new eco-design concepts for DFP with less dependence of design intuitions. 相似文献
Micro and multiscale sheet metal forming processes represent new and attractive solutions to many manufacturing problems. However, evaluating the strains in these products is a difficult endeavor. Larger organizations are utilizing commercially available microscale digital image correlation systems to measure the strains in microscale parts or on macroscale parts with critical microscale features. The cost of these strain measurement systems is preventing smaller research and development organizations from entering this challenging area or they are forgoing the ability to determine strains. The present paper describes the development of a method for creating microscale grids and measuring strains on microscale parts or microscale locations on larger parts. The method developed was able to measure true strains up to 0.618 for square grids that are 127 μm measured from center-to-center. Microscale strains resulting from sheet bulge hydroforming experiments using 11 mm, 5 mm, and 1 mm diameter dies were evaluated and material properties of the sheet metal were estimated based upon the strains measured in conjunction with FEA simulations and compared to analytical solutions and microscale tension tests. The material properties determined using the strains and FEM approach were consistent with the other methods. 相似文献
13C CP-MAS NMR spectroscopy is a technique that has proved to be useful in studying soil organic matter (SOM). Nevertheless, NMR spectra exhibit a weak signal and have very low resolution due to: the low natural abundance of 13C (1.1 % of C) in SOM, the generally low SOM content of soils, and the presence of paramagnetic impurities. This paper studies the effects of soil chemical pre-treatments on 13CP-MAS NMR spectra quality and spectra representativity i.e. soil C mass balance.
After chemical pre-treatment to increase total organic carbon (TOC) content and C/Fe ratio, eight soils characterized by different levels of organic carbon content and C/Fe ratios were studied using 13CP-MAS NMR. Moreover, where chemical treatments were not applicable due to high carbon losses, the number of 13CP-MAS NMR scans was increased in order to obtain satisfactory spectra.
Results show that chemical pre-treatment of soils with C/Fe > 1 caused high C losses. Bulk soils were therefore studied by increasing the number of 13CP-MAS NMR scans. Acceptable spectra were obtained from 8K scans (1K = 1024 transient). On the other hand, even when a large number of scan (32K) are used, soil with C/Fe < 1 cannot be studied. As these soils are characterized by low C losses after HCl treatments (range of 2.9–25.4%), a pre-treatment of at least 1.39 mol l−1 HCl removes excess Fe and at the same time increases C/Fe ratio resulting in 32K scans providing good spectra. 相似文献