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For machinery product experienced several operating conditions, this paper proposes a framework of fuzzy reliability analysis of machinery accelerated testing. Due to the non-stationary of the vibration signals, a Gaussian mixture model (GMM) method is introduced to obtain the degradation index through calculating the overlap between current feature set and the historical baseline set. The features in four domains are extracted. Considered that the uncertainties exit in feature extraction and health assessment, a fuzzy regression model is used to describe the degradation path at each operating condition and compute fuzzy quasi time to failures (q-TTFs). Meanwhile, the relationship between q-TTFs and environmental variables are identified by a linear model, through which the fuzzy reliability analysis can be conducted with the most appropriate lifetime distribution. An industrial application is used to verify the effectiveness of the proposed framework and the results have confirmed a good consistency with the true values.

This paper proposes a novel method of fuzzy analysis for bearing accelerated degradation testing, which extracts degradation index from bearing vibration signals under different accelerated levels and obtains fuzzy failure time based on fuzzy regression model in consideration of uncertainties. Identification of accelerated model is conducted through linear mixture model. The proposed method provides a methodology to do accelerated vibration analysis for rotating machinery products. An industrial application is used to verify its effectiveness.

The frother is a mixture of alpha,alpha,4-trimethyl-3-cyclohexene-1-methanol, 1,7,7-trimethyl-bicyclo(2.2.1)heptan-2-ol and cineol with alcohol, ethers and ketones of C6-8 at a suitable ratio. An industrial-scale flotation test was carried out in a gravity-flotation plant in Gejiu, Yunnan. Flotation indexes obtained by 730A frother were better than those achieved using pine oil at the same dosage. Concentrate grade was increased by 0.51% and Cu recovery by 3.98%. Tests at a flotation plant in Yimen indicated that 730A not only improved grade and recovery but also reduced frother dosage from 53.49 g/t of pine oil to 35.28 g/t of 730A. The results show that frothers play an important role in mineral flotation., The frother is a mixture of alpha,alpha,4-trimethyl-3-cyclohexene-1-methanol, 1,7,7-trimethyl-bicyclo(2.2.1)heptan-2-ol and cineol with alcohol, ethers and ketones of C6-8 at a suitable ratio. An industrial-scale flotation test was carried out in a gravity-flotation plant in Gejiu, Yunnan. Flotation indexes obtained by 730A frother were better than those achieved using pine oil at the same dosage. Concentrate grade was increased by 0.51% and Cu recovery by 3.98%. Tests at a flotation plant in Yimen indicated that 730A not only improved grade and recovery but also reduced frother dosage from 53.49 g/t of pine oil to 35.28 g/t of 730A. The results show that frothers play an important role in mineral flotation.