all journal bearing has a shaft diameter=1.25in and suppports a load of 1200lbf. the bushing is...

all journal bearing has a shaft diameter=1.25in and suppports a load of 1200lbf. the bushing is 1.25-in long and has a bore diameter=1.25in. shfat speed=1500 rev/min. average film temperature=115.4^oF and SAE grade 30 lubricant is used. average clearance =0.001125 in. Find

a) magnitud and location of min oil-film thickness

b) total lubricant volumetric flow rate

c) max oil-folm pressure and its angular location

d) power loss

Expert Solution

samet mamat answered 2 years ago

For a marine diesel engine application, a fluid-film journal bearing has a shaft diameter of 32...

For a marine diesel engine application, a fluid-film journal bearing has a shaft diameter of 32 mm and the length of the bearing is 24 mm. The bearing uses SAE grade 20 oil as lubricant and operates under a radial load. The inlet and outlet temperatures of oil are 50oC and 110oC respectively. It is assumed that because of the shearing action there is a uniformly distributed energy release in the lubricant that heats the lubricant film. During run-in operation,...

A journal and bearing are to be designed for a shaft that turns at 250 rpm....

A journal and bearing are to be designed for a shaft that turns at 250 rpm. Suppose ISO VG100 (SAE Engine 30) is to be used as lubricant and the bearing length is to be equal to 1.2 times the diameter. If the no-load power loss is not to exceed 2.5 x 10-4 horsepower and the diametral clearance is 0.0045 times the diameter, estimate the maximum diameter that can be used for the journal, and the allowable temperature limit.

A horizontal shaft of 75mm diameter projects from a bearing and, in addition to the torque...

A horizontal shaft of 75mm diameter projects from a bearing and, in addition to the torque transmitted, the shaft carries a vertical load of 8 kN at 300 mm from the bearing. If the safe stress for the material, as determined in a simple tension test, is 135 MN/m2 find the safe torque to which the shaft may be subjected using as a criterion (a) The maximum shearing, stress, (b) The maximum strain energy per unit volume. Poisson’s ratio ?...

A shaft inside the sleeve of a journal bearing is being rotated at 1500 rpm. The...

A shaft inside the sleeve of a journal bearing is being rotated at 1500 rpm. The shaft is 6.00 cm in diameter and is rotating in a bearing sleeve that is 6.02 cm in diameter and 40 cm long. The clearance is filled with oil having properties of ?=0.003 m2 /s and SG=0.88. a. Find the torque required to rotate the shaft. b. Find the power required to rotate the shaft. (Answer: 44.1 kW) c. Discussion: How do the torque...

A .05 wide journal bearing supporting the loads on a 1 inch shaft just meets the...

A .05 wide journal bearing supporting the loads on a 1 inch shaft just meets the Trumpler’s design criteria for a FACTOR OF SAFTY OF 2.05. The bearing satisfies all the other Trumpler’s design criteria by much larger margin. Your colleague suggests that increasing the bushing width to 0.75 inches would be an adequate design and you would not need to conduct another journal bearing analysis because the greater width would result in a bearing which satisfy all of Trumpler’s...

The existing record shows machine bearing has a mean diameter of 0.6 inches. Bearing diameter is...

The existing record shows machine bearing has a mean diameter of 0.6 inches. Bearing diameter is known to be normally distributed with standard deviation σ = 0.1 inches. (Additional note: If the mean diameter of bearings is larger or smaller than 0.6 inches, then the process is out of control and must be adjusted.) A random sample of 60 bearings are selected, and the average diameter of the bearing from this sample is 0.55 inches. Use α=0.02 to test the...

The J-shaped member shown in the figure is supported by a cable DE and a single journal bearing with a square shaft at...

The J-shaped member shown in the figure is supported by a cable DE and a single journal bearing with a square shaft at A. Determine the reaction forces A_y and A_z at support A required to keep the system in equilibrium. The cylinder has a weight W_B = 5.30 lb, and F = 1.20 lb is a vertical force applied to the member at C. The dimensions of the member are w = 1.50 ft, l = 6.00 ft, and...

The J-shaped member shown in the figure is supported by a cable DE and a single journal bearing with a square shaft a...

The J-shaped member shown in the figure is supported by a cable DE and a single journal bearing with a square shaft at A. Determine the reaction forces Ay and Az at support A required to keep the system in equilibrium. The cylinder has a weight WB = 5.80 lb, and F = 1.30 lb is a vertical force applied to the member at C. The dimensions of the member are w = 1.50 ft, l = 6.00 ft, and...

The propeller shaft of a large ship has an outside diameter of 350 mm and inside...

The propeller shaft of a large ship has an outside diameter of 350 mm and inside diameter 250mm. the shaft is rated for a maximum of shear stress 62 MPa. 1) if the shaft is runnning at 500 rpm what is the maximum power that can be transmitted without exceeding allowable stress. 2) if the rotational speed of the shaft is doubled but the power requirements unchanged what happens to the shear stress in the shaft? calculate valures.

A shaft cycles such that each bearing undergoes the radial loads of 30% of the time...

A shaft cycles such that each bearing undergoes the radial loads of 30% of the time at 20kN, 50% of the time at 25kN, and 20% of the time at 30kN. If the design life of a bearing is to be at least 5e6 revolutions, select the smallest 03 series cylindrical roller bearing that will accomplish this.

Question