The third chapter makes an elaborate comparison on the phonetic characteristics of Dongfeng Hakka and Elihua, and then aims to compare Dongfeng Hakka and Elihua with Meixian Hakka,Yizhang Hakka, Xiangnan dialect,southwest mandarin and Xiang groups in order to discuss the language contact influence of the phonological systems.

Calculation of Interface Width and Contact Stress of Spinning Top Roller and Roller;

The calculation of contact stress of rock bit floating ring journal bearing under disalignment;

Numerical simulated analysis of the contact stress on the sealing rubber of the packer;

This paper focuses on the contacting stress between the plunger and the seal ring,and analyzes the effect of the seal ring structure parameters on the contacting stress.

On the basis of theoretical study on the high speed cylindrical roller bearing a finite element analysis was carried out on the common steel bearings and the ceramics bearings, and the influence of rotary speed on the contacting stress and the equivalent stress.

According to the calculation on the contacting stress and the linear speed of the gear in the hoist of the 16t-30m portal crane,the N460 heavy duty industrial gear oil was selected instead of the recommended lube oil in instruction book.