DESCRIPTION : The apparatus consists of a plain steel shaft encased in a bearing and directly driven by a small electric motor. The bearing is freely supported on the shaft and sealed at the motor end.
The motor speed is precisely controlled and adjusted by specially designed control unit and can be run in both the directions.
The bearing contains twelve equispaced pressure lappings around its circumference and four additional ones along its topside and on a vertical radial plane. All are connected by light and flexible plastic tubes to the rear manometer panel so that pressure head of aoil at all sixteen points can be clearly observed at all times.
Oil is supplied to a low pressure region at both ends of the bearings by an adjustable resevoir fitted at the side of the rear panel.
The bearings can be loaded by attaching various weights to the arms supported beneath it.
A label is conveniently provided at the front of the apparatus. SPECIFICATIONS : Journal Bearing -- 70mm dia (Nominal) 75mm dia.
Weights -- 4 adjustable weights.
Recommended oil -- SAE 10
Motor -- D.C. shunt wound Speed range 500-3000 m rev/min
in both the directions
Control Unit -- Special design.
Manometer Panel -- 18 tubes mounted on a wooden back board FEATURES : ? Pressure profiles along and around the bearing continuously monitored on large manometer panel.
? Theoretical pressure profile (Sommerfeld Analysis) an be carried out and compared with practical results.
? Wide range of speeds and loads possible
? Ideal for group studies and demonstrations.
? A. C. single phase F.H.P. motor is used with a speed control unit.
? Manometer height of 2-3m, provided for specialised low clearance bearing studies (according to order) RANGE OF EXPERIMENTS : 1) Simple Demonstrations
Observation of the pressure profile at the various conditions of load and speed
2) Expermintal Investigation :
After noting the pressure profile for any chosen conditions the following analysis may be conducted.
a) Plotting the cartesian and polar pressure curves.
b) Plotting the theoretical Sommerfeld curves
- K sin(2 + ncos)
P ? Po = ------------------------
( 1 + ncos)2 SERVICE REQUIRED : A.C. Single phase 230V 50Hz. Electrical supply. INSTRUCTION MANUAL : A Technical Manual accompanies the apparatus. The details the equipment and test procedure. |
