桥式起重机毕业设计外文翻译.doc

毕业设计(论文)外文翻译
专业名称机械设计制造及其自动化
班级学号 09031307
学生姓名陈善君
指导教师于斐
填表日期 2013 年 01 月 12 日
英文原文:
Fatigue life prediction of the metalwork of a travelling gantry
crane
. Kopnov
64,Eknteriuburg 620107,Russian
Received 3 April 1998;accepted 29 September 1998
Abstract
Intrinsic fatigue curves are applied to a fatigue life prediction problem of the metalwork of a traveling gantry crane. A crane, used in the forest industry, was studied in working conditions at a log yard, an strain measurements were made. For the calculations of the number of loading cycles, the rain flow cycle counting technique is used. The operations of a sample of such cranes were observed for a year for the average number of operation cycles to be obtained. The fatigue failure analysis has shown that failures some elements are systematic in nature and cannot be explained by random Elsevier Science Ltd. All rights reserved.
Key words: Cranes; Fatigue assessment; Strain gauging
1. Introduction
Fatigue failures of elements of the metalwork of traveling gantry cranes LT62B are observed frequently in operation. Failures as fatigue cracks initiate and propagate in welded joints of the crane bridge and supports in three-four years. Such cranes are used in the forest industry at log yards for transferring full-length and sawn logs to road trains, having a load-fitting capacity of 32 tons. More than 1000 cranes of this type work at the enterprises of the Russian forest industry. The problem was stated to find the weakest elements limiting the cranes' fives, predict their fatigue behavior, and give mendations to the manufacturers for enhancing the fives of the cranes.
2. Analysis of the crane operation
For the analysis, a traveling gantry crane LT62B installed at log yard in the Yekaterinburg region was chosen. The crane serves two saw mills, creates a log store, and transfers logs to or out of road trains. A road passes along the log store. The saw mills are installed so that