3 results about "Small sample" patented technology

The invention discloses a test method for testing a P-S-N curve of high-cycle fatigue of an aero-engine material by a small sample amount. The method comprises the steps that same probability distribution points of fatigue lives of same samples under different stress levels in respective parent distribution meet an expression of a formula (4) defined in the specification, and in the formula (4), nji is logarithmic life of the sample i under the jth stress level, mu j is a logarithmic life mean under the jth stress level, sigma j is a logarithmic life standard deviation under the jth stress level, and meanings are same when a subscript j is changed to k; the life sample points under the different stress levels have a one-to-one corresponding relationship; according to the corresponding relationship in the formula (4), the fatigue life on a stress level is equivalent to another stress level, so that sample information aggregation is realized; equivalent large samples are obtained througha small sample test; and according to equivalent large sample data, life distribution parameter statistics is performed. According to the method provided by the invention, based on a sample aggregation principle, fatigue life distribution can be obtained through a small amount of test data, and the relatively accurate P-S-N curve is obtained.

The invention discloses a multifunctional homogenizer comprising a homogenizing tube and a homogenizing rod inserted in the homogenizing tube. The wall thickness of the bottom of the homogenizing tubeis larger than the wall thickness of the side wall. The homogenizing tube comprises an anti-overflow chamber, a coarse grinding chamber and a fine grinding chamber communicating with one another andhaving shapes of large upper part and small lower part; a coarse and fine mixing positioning table is arranged between the coarse grinding chamber and the fine grinding chamber; the anti-overflow chamber is in the shape of a waist drum; the homogenizing rod comprises a rod body, a splash-proof cover and a grinding head arranged up and down; the cross-sectional area of the splash-proof cover is smaller than an opening at the top of the anti-overflow chamber and larger than the outer diameter of the grinding head; the grinding head comprises a coarse grinding section, a coarse and fine mixing transfer face and a fine grinding section corresponding to the coarse grinding cavity, the coarse and fine mixing positioning table and the fine grinding cavity respectively. According to the characteristics of samples and experimental requirements, more animal and plant tissues can be grounded roughly and mixed and grounded roughly and finely under required temperature conditions, and a small amount of micro-organisms can also be ground finely so as to quickly achieve complete homogenization effect of various samples, ideal homogenizing effect and small sample loss.