Huang Zhi-chu

Nonlinear comminution process modeling based on GA–FNN in the computational comminution system

Abstract A new concept named computational comminution is firstly proposed in this paper. Based on information technology, the structure of a computational comminution system (CCS) is built. The study on CCS is very different from the traditional ones for comminution, such as the study based on theoretic models, or the study based on experimental models. As one of the key technologies in CCS, a modeling framework for comminution processes is implemented particularly by employing GA–FNN that can model complex nonlinear processes such as the comminution process of cement by integrating artificial neural networks, fuzzy sets and genetic algorithms. Application results of this modeling method to the Horomill cement comminution process show that the modeling framework discussed in this paper is efficient.

Specific property of ultrafine particle classification

In the process of ultrafine particle classification, the separation curve, which reflects the characteristics of separating process, is frequently influenced by the characteristics of separation flow field operating parameters, etc. This paper introduces the concept of system deviation and deduces the calculating method of the separation curves. Meanwhile, it analyses the influences of classification flow field’s specific properties and some operating parameters on the separation curves. The results show that, in the process of ultrafine particle classification, the local vortex in the separation field improves the separation efficiency to a certain degree, but the accuracy will decrease; the coacervation action of particles will seriously influence the classification accuracy.

Experimental research on performances of dry-grinding fine cement for grouting

The performances of dry-grinding fine cemenT (DFC) in grouting procedure were experimentally studied. The measurement of its fineness and simulated test for injectability showed that this DFC could be used to inject rock mass with micro-fissure. In order to improve the grouting quality, the water-cement ratio and discarding time of slurry should be controlled precisely. If the water-cement ratio is over 2∶1 in slurry that is made from DFC, it is not suitable to grout. Finally, the influence of different mixing times on strength of hydrated cement made from the DFC is explained by microstructure analysis with SEM.

Sensitivities of mechanical structures to structural parameters

Abstract A method is formulated for calculating the sensitivities of natural frequencies and mode shapes directly with respect to structural parameters. The method is valid for discrete systems, and also suitable for distributed structures when combined with the finite element method. Two examples are presented to verify its usefulness.