Papers by Author: Shi Shun Zhu

Abstract: In order to study the influence upper equipment load spectrum from upper spring mass, six freedom vibration signals on the vehicle was measured in a Chinese PG. The signals were the acceleration-time histories. Test was made under 3 loads conditions, which represent 3 types of upper spring mass. After filtering, rainflow counting, fatigue damage caused by the load spectrum was got. Result shows there were great difference in distributions between different direction load spectrums; spring upper load made small influences for the character of load spectrum at the same direction. The upper spring mass became larger, the equipment suffers more damage.

Abstract: Bending fatigue is one of the main failure modes of gears. The method of gear fatigue design was discussed in many papers. Most of them are based on GB/T3480-83.But study shows that the method current widely used only fits for the single side loaded gear. For double sides loaded gear, only a mean stress modification coefficient is concerned compared to single side loaded gear. A new formula based on fatigue theory is given to modify the mean stress in consideration of the load character of doubled sides loaded gear. The method given in the paper is an addition to the traditional gear design method.

Abstract: One of the biggest problems to predict the bending fatigue life of gear is lack of S-N data from the standard gear specimen. It is expensive and long time to spend to do the specimen tests. The bending fatigue property data from database is not enough to fulfill the engineering needs. To solve the problem, multiaxial methods are used to predict the bending fatigue life of gears and FEA method is used to analyze the stress of gear teeth root. Result shows that McDiarmid model, Findley model and Maximum shear stress model fulfill the engineering needs and McDiarmid method is the most accurate.