Modification on working resistance of sand bulldozingbased on numerical and empirical method(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年6期
- Page:
- 118-126
- Research Field:
- 汽车与机械工程
- Publishing date:
Info
- Title:
- Modification on working resistance of sand bulldozingbased on numerical and empirical method
- Author(s):
- HE Yutian1; LYE Pengmin2; LIU Chunchao3; GUO Longlong1; WU Wen2
- (1. School of Mechanical Engineering, Xian Shiyou University, Xian 710065, Shaanxi, China; 2. Key Laboratory of〖JP〗Road Construction & Equipment of MOE, Changan University, Xian 710064, Shaanxi, China;3. Shantui Construction Machinery Co., Ltd., Jining 272073, Shandong, China)
- Keywords:
- mechanical engineering; working resistance; flat blade; soil bulldozing; sand; modification
- PACS:
- -
- DOI:
- -
- Abstract:
- Based on geometric approximation of the heaped soil profile in front of the flat blade and calculation model simplification of shear strength between the heaped soil and ground, the theory 〖CM（156mm〗calculation model of working resistance without influence of adhesive force was established.〖CM）〗 Twenty groups of soil bulldozing experiment for flat blades under 5 rake angles and 4 operating depths were completed in selfdesigned test equipment filled with sand soil. The working resistances of the bulldozing experiments calculated by the theory calculation model which were regard as theoretical values, and the average working resistances during bulldozing stabilization stage of each experiment which were regard as measured values. The comparisons between the theoretical values and the measured values were carried out. In order to obtain more reliable the theoretical prediction results, the theoretical values were modified by numerical method and empirical method. The calculation methods of numerical correction coefficient and empirical correction coefficient were given, and two correction coefficients are function of the rake angle α and the operating depth d. The results show that there is a certain errors between the theoretical values and the measured values when the operating depths less than 90 mm, but the theoretical values are greater than the measured values, therefore, the theoretical prediction results are relatively conservative. The errors between the theoretical values and the measured values are small at different rake angle when the operating depth is 120 mm, and the theoretical values fluctuated around the measured values. There are significant errors between theoretical values and measured values when working condition under the operating depth is 150 mm and rake angle less than 80 degree, at this time, the theoretical values are less than the measured values, and the theoretical prediction results are unreliable. The numerical modification results are closer to measured value, but the numerical modification values should be calculated by the measured values. However, the empirical modification results are more conservative and the calculation method is relatively simple. Therefore, it is able to use different modified model to calculate working resistance according to practical requirements during engineering design. 1 tab, 10 figs, 25 refs.
Last Update: 2020-12-17