tailieunhanh - Electronic Navigation Systems 3E Episode 11

Tham khảo tài liệu 'electronic navigation systems 3e episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | The ship s master compass 289 A sensitive spirit level graduated to represent 2 min of arc is mounted on the north side of the rotor case. This unit indicates the tilt of the sensitive element. A damping weight is attached to the west side of the rotor case in order that oscillation of the gyro axis can be damped and thus enable the compass to point north. The rotor case is suspended along the vertical axis inside the vertical ring frame by means of the suspension wire 7 . This is a bunch of six thin stainless steel wires that are made to be absolutely free from torsion. Their function is to support the weight of the gyro and thus remove the load from the support bearings 2 . Tilt stabilization liquid ballistic To enable the compass to develop a north-seeking action two ballistic pots 3 are mounted to the north and south sides of the vertical ring. Each pot possesses two reservoirs containing the high density liquid Daifloil . Each north south pair of pots is connected by top and bottom pipes providing a total liquid air sealed system that operates to create the effect of top heaviness. Because the vertical ring and the rotor case are coupled to each other the ring follows the tilt of the gyro spin axis. Liquid in the ballistic system when tilted will generate a torque which is proportional to the angle of the tilt. The torque thus produced causes a precession in azimuth and starts the northseeking action of the compass. Azimuth stabilization phantom ring assembly Gyro freedom of the north south axis is enabled by the phantom ring and gearing. This ring is a vertical circle which supports the north south sides of the horizontal ring on the spin axis by means of high precision ball bearings. A small oil damper 6 is mounted on the south side of the sensitive element to provide gyro stabilization during the ship s pitching and rolling. The compass card is mounted on the top of the upper phantom ring stem shaft and the lower stem shaft is connected to the .