1.1. Journal bearings are one of the most common types of hydrodynamic bearings. Their primary purpose is to support a rotating shaft. The bearing has a shaft diameter of 93.00 mm with a unilateral tolerance of -0.02 mm. The bushing bore has a diameter of 93.10 mm with a unilateral tolerance of 0.06 mm. The bushing is 36 mm long and supports a load of 2300 N. The journal speed is 820 rev/min. For the minimum clearance assembly, determine: a) Sommerfeld number, minimum film thickness and heat loss rate for SAE 10 at 52.5°C film temperature. b) Sommerfeld number, minimum film thickness and heat loss rate for SAE 60 at 70°C temperature.

1.1. Journal bearings are one of the most common types of hydrodynamic bearings. Their primary purpose is to support a rotating shaft. The bearing has a shaft diameter of 93.00 mm with a unilateral tolerance of -0.02 mm. The bushing bore has a diameter of 93.10 mm with a unilateral tolerance of 0.06 mm. The bushing is 36 mm long and supports a load of 2300 N. The journal speed is 820 rev/min. For the minimum clearance assembly, determine: a) Sommerfeld number, minimum film thickness and heat loss rate for SAE 10 at 52.5°C film temperature. b) Sommerfeld number, minimum film thickness and heat loss rate for SAE 60 at 70°C temperature.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

The main bearings of a one-cylinder steam engine are 152 mm diameter and 280 mm long and support a load of 4,400 kg. The bearings are well ventilated and are heavy in construction. The coefficient of friction in bearing is 0.017 and crankshaft rotates at 450 rpm. Bearing diameter clearance is 0.152 mm. a) Determine the unit loading in pounds per square inch. b) Determine the friction loss per bearing in kilowatts.
The connection between an electric motor and a work machine shaft is achieved through a flanged rigid coupling where the torque is transmitted via coupling flanges. The power and rotational speed of the electric motor are determined using the last two digits of the student numbers, according to the formulas provided below. The coupling flanges are connected with three bolts of grade 5.6 with a 40 mm pitch circle diameter. The surface pressure endurance limit for the bolts is 16 MPa. The contact length between the bolt and the coupling flange is 12 mm. The coefficient of friction on the flange surfaces is 0.14, and the operating factor for the coupling is 0.8. The working conditions and material properties of the contact element are well-known, allowing for accurate force and stress analysis. (NO=35) a) Determine the bolt to be used in the coupling from the table. b) Draw the full sectional view of the used coupling. Power (N): N = NO [kW]Speed (n): n = NOx12 + 450 [rpm]
8.. An air blower is to deliver 40,000 ft3 /min. Two U-tube gages measure suction and discharge pressures. The suction gage reads a negative 2′′ of water. The discharge gage, located 3 ft above the point to which the suction gage is attached, reads +3′′ of water. The discharge and suction ducts are of equal diameter. What size motor should be used to drive the blower if the overall efficiency is 68% (γ = 0.0750 lb/ft3 for air)? indicate free body diagram
A nut which is connected to a lead screw is moved in a horizontal plane against a force of 100kN at a speed of 4mm/sec by electric motor powered screw. The following data is given Single start square thread screw Pitch of the screw = 6mm Outlet diameter of the screw = 40mm Co-efficient of friction of the screw thread = 0.15 Efficiency of the motor = 85% Determine the power required and efficiency of the screw
The values given for a radial plain bearing are:Shaft diameter = 40 mm, bearing width = 30 mm, Pem = 6 N / mm2, Radial force = 2 KN, Ty = 45 C, oil: ISO VG 15, bearing clearance = 35 µm, dynamic viscosity for given oil and temperature = 12 m Pa. sRequired:a) What is the working cycle of the shaft?b) Find the Sommerfeld number.
A winch drum of diameter 161 mm turning at 12pm lifts a load of 7.5kN. What is the winch output power?
Mechanical design A shaft with the following data: 1- The pulley (A) is 1000 mm in diameter and weight 300N. 2- The gear (B) pitch diameter is 600mm and weight -250N. 3- The pulley is keyed to the shaft at 400mm to the left of left hand bearing. 4-the distance between bearing C and B is 1250 mm. 5- The power is 20 kW at 750 rpm. 6- Tension ratio T1 / T2-2.5 7- The shaft d.livers power to a gear placed horizontally in front, the pressure angel of gear is 20. 8- The allowable shear stress is 70N / mm, kt-2 and km- 1.5. Determine: the diameter of shaft
A conical Clutch transmits rotation from one rotating shaft to another though frictional forces on the conical face. The following data is for a conical clutchInside Diameter 25.0 mmOutside Diameter 100 mmCoefficient of Friction 0.33Axial Force 1000NIncluded angle 100 degreeRotational speed 1500rev/minuteCalculate the Torque and Power that can be transmitted without slipping using both Uniform Pressure Theory and Uniform Wear Theory
a steam engine runs at 150rpm. its turning moment diagram gave the areas in mm2 taken in order above and below the mean torque line is 500,250,270,390,190,340,270,250, the scale for turning moment is 1mm=500mnm, 1mm=5’ if the fluctuation of speed is not to exceed +or-1.5% of mean, determine a suitable diameter and cross-section of the rim of flywheel with axial dimension equal to 1.5times the radial dimension. the hoop stress is limited to 3mpa and the density of material of flywheel is 7500kg/m3.
A 3/8 inch flat leather belt is 12 inch wide and is used on a 24 inch diameter pulley rotating at 600 rpm. The specific weight of the belt is 0.035 lb/in3. The angle of contact is 1500. If the coefficient of friction is 0.3 and the allowable stress is 300 psi, how much hp can it transmit?
A solid steel shaft, whose Sy= 300 MPa and Su= 400 MPa, is used to transmit 3000 kW at 800 rpm. Determine its diameter.
How much torque can a cone clutch transmit if the angle of the conical elements is 10 degrees. The mean diameter of conical sections is 200 mm and an axial force of 600 N is applied. Consider a coefficient of friction