返回首页
当前位置: 主页 > 直升机资料 > 机务资料 >

Sun Gear Fault Detection on an OH-58C Helicopter Transmission(24)

时间:2011-10-26 20:59来源:蓝天飞行翻译 作者:admin
曝光台 注意防骗 网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者

Group 6  80.0  173.3  266.7  360.0 
Group 7  93.3  186.7  280.0 

Table 4. OH-58C Sun Gear Mesh Groups (Degrees)
Experimental Setup

Tests were conducted on the OH-58 500HP transmission test rig located at NASA Glenn Research Center (GRC) in Cleveland, Ohio. Vibration, acoustic, and oil debris infor-mation was measured using nine accelerometers, .ve mi-crophones, and an oil debris monitor. Four of the nine ac-celerometers were used on the input and output torsional acceleration adapters to be used to measure aggregate trans-mission error. The remaining .ve accelerometers were mounted to the transmission housing at several locations.
A schematic showing the accelerometer positions is given in Figure 25:

Data from the .ve accelerometers is presented in this paper.
Figure 25 is shown with the once-per-rev sensor taken as the origin, putting the input shaft at an angle of 258o . Although not intuitive schematically, this does simplify the signal processing. Three seeded fault cases were tested. All measurement were conducted at full mast loading. The test matrix is given in Table 5
Test Matrix
Input Speed (RPM)  Output Speed (RPM)  Input Torque (in-lbs.)  Output Torque (x103)  Rated Speed  Rated Torque  Power (HP) 
6060  348  3099  5.41  100%  100%  298 
6255  359  2476  4.32  103%  80%  246 
6294  361  1717  2.99  103%  55%  171 
6208  356  803  1.4  102%  26%  79.1 

Table 5. Test Matrix
The OH-58 Helicopter Transmission

The OH-58 is a single-engine, land-based light observa-tion helicopter. It is a 2 two-stage reduction gearboxes con-sisting of a bevel stage and a planetary stage with an overall reduction of 17.44:1. The bevel stage consists of a 19-tooth spiral bevel pinion meshing with a 71-tooth gear. The bevel gear is splined to the 27-tooth sun gear which is the input to the second stage. The sun gear drives 4 35-tooth planets against a 99-tooth ring gear, which is splined to the trans-mission housing. The carrier is splined to the mast output shaft which powers the helicopter’s main rotor.
 
直升机网 www.helicopter.cn
直升机翻译 www.aviation.cn
本文链接地址:Sun Gear Fault Detection on an OH-58C Helicopter Transmission(24)

------分隔线----------------------------
  • 上一篇:没有了
  • 下一篇:没有了