This paper concentrates on the research of plaster-bonded moulding matertal with coal mine waste as its major filler and its process. Having made a careful investigation of various factorsaffecting properties of the m...This paper concentrates on the research of plaster-bonded moulding matertal with coal mine waste as its major filler and its process. Having made a careful investigation of various factorsaffecting properties of the moulding material, the authors optimize several new formulations of thismaterial and the prarees which are inexpensive, convenient in application, precise in bokling sizoof moulds.展开更多
The present research work emphasized on identifying and optimizing various significant process parameters of high pressure die casting by using QFD-Taguchi based hybrid approach in order to yield the optimum casting d...The present research work emphasized on identifying and optimizing various significant process parameters of high pressure die casting by using QFD-Taguchi based hybrid approach in order to yield the optimum casting density of the A380alloy.Identification of critical process parameters,selection of appropriate orthogonal array,analysis of means and analysis of variance are employed to study the performance characteristic of the die casting process.The most critical process parameters identified and optimized by QFD-Taguchi based hybrid approach,such as the injection pressure,the molten metal temperature,the plunger velocity(first and second stage)and the die temperature were explored in the experimental work.The results show that injection pressure is the most significant factor among the selected parameters.The contribution of the injection pressure to the variation of mean casting density is around61.483%.Confidence interval(CI)has also been estimated as0.000718for95%consistency level to validate the predicted range of optimum casting density of aforesaid alloy.展开更多
Many spectrum correction methods have been developed, but their performance degrades significantly when they are applied to the correction of low frequency component （ LFC ）. It owns to that the model underlying the...Many spectrum correction methods have been developed, but their performance degrades significantly when they are applied to the correction of low frequency component （ LFC ）. It owns to that the model underlying the conventional approaches neglects the interference of the negative frequency in the real signal. A new approach for the correction of the LFC is proposed, which suits all kinds of symmetrical windows. It divides a signal into three sections and makes use of the first spectrum line of each section. Then this approach is modified so that it is also applicable to the correction of the high frequency component. Thus a timedelay-based all-frequency correction method is proposed. The simulation results show that this method is simple and feasible. By this method, the accurate frequency, amplitude and phase of the spectral line can be obtained whether it is close to or far from OHz.展开更多
文摘This paper concentrates on the research of plaster-bonded moulding matertal with coal mine waste as its major filler and its process. Having made a careful investigation of various factorsaffecting properties of the moulding material, the authors optimize several new formulations of thismaterial and the prarees which are inexpensive, convenient in application, precise in bokling sizoof moulds.
基金the National Institute of Technology,Manipur,Imphal for Financial Support to carry out the experimental work of Mr.K.Ch.Apparao
文摘The present research work emphasized on identifying and optimizing various significant process parameters of high pressure die casting by using QFD-Taguchi based hybrid approach in order to yield the optimum casting density of the A380alloy.Identification of critical process parameters,selection of appropriate orthogonal array,analysis of means and analysis of variance are employed to study the performance characteristic of the die casting process.The most critical process parameters identified and optimized by QFD-Taguchi based hybrid approach,such as the injection pressure,the molten metal temperature,the plunger velocity(first and second stage)and the die temperature were explored in the experimental work.The results show that injection pressure is the most significant factor among the selected parameters.The contribution of the injection pressure to the variation of mean casting density is around61.483%.Confidence interval(CI)has also been estimated as0.000718for95%consistency level to validate the predicted range of optimum casting density of aforesaid alloy.
文摘Many spectrum correction methods have been developed, but their performance degrades significantly when they are applied to the correction of low frequency component （ LFC ）. It owns to that the model underlying the conventional approaches neglects the interference of the negative frequency in the real signal. A new approach for the correction of the LFC is proposed, which suits all kinds of symmetrical windows. It divides a signal into three sections and makes use of the first spectrum line of each section. Then this approach is modified so that it is also applicable to the correction of the high frequency component. Thus a timedelay-based all-frequency correction method is proposed. The simulation results show that this method is simple and feasible. By this method, the accurate frequency, amplitude and phase of the spectral line can be obtained whether it is close to or far from OHz.
