A 3-inch diameter shaft rotates at 750 rev/min in a 3-inch-long full journal bearing. The lubricant sump has a steady-state temperature of 100°F. Analyze the assembly assuming average clearance and a H8/f8 clearance fit. The maximum lubricant temperature must not exceed200°F. Determine the following: a. If SAE Grade 40 lubricant is used, find the maximum radial load that the journal can carry

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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**Journal Bearing Analysis Under Different Lubrication Conditions**

A 3-inch diameter shaft rotates at 750 rev/min in a 3-inch-long full journal bearing. The lubricant sump has a steady-state temperature of 100°F. Analyze the assembly assuming average clearance and a H8/f8 clearance fit. The maximum lubricant temperature must not exceed 200°F. Determine the following:

**a. SAE Grade 40 Lubricant Analysis:**
- **Objective:** Find the maximum radial load the journal can carry and still operate under thick-film lubrication conditions, i.e., the minimum film thickness: \( h0 ≥ 6.3 \times 10^{-4} \) inches.
- **Requirements:**
  - Maximum radial load.
  - Corresponding total lubricant volumetric flow rate.
  - Power loss.

**b. SAE Grade 50 Lubricant Analysis:**
- **Objective:** Find the maximum radial load the journal can carry and still operate under thick-film lubrication conditions.
- **Requirements:**
  - Maximum radial load.
  - Corresponding maximum oil-film pressure.
  - Angular location of maximum pressure.

Please proceed with the necessary calculations considering the provided rotational speed, clearance fit, and lubricant properties corresponding to the mentioned grades (SAE Grade 40 and SAE Grade 50). The analysis should ensure the operational criteria and constraints are met, particularly regarding temperatures and lubrication film thickness.
Transcribed Image Text:**Journal Bearing Analysis Under Different Lubrication Conditions** A 3-inch diameter shaft rotates at 750 rev/min in a 3-inch-long full journal bearing. The lubricant sump has a steady-state temperature of 100°F. Analyze the assembly assuming average clearance and a H8/f8 clearance fit. The maximum lubricant temperature must not exceed 200°F. Determine the following: **a. SAE Grade 40 Lubricant Analysis:** - **Objective:** Find the maximum radial load the journal can carry and still operate under thick-film lubrication conditions, i.e., the minimum film thickness: \( h0 ≥ 6.3 \times 10^{-4} \) inches. - **Requirements:** - Maximum radial load. - Corresponding total lubricant volumetric flow rate. - Power loss. **b. SAE Grade 50 Lubricant Analysis:** - **Objective:** Find the maximum radial load the journal can carry and still operate under thick-film lubrication conditions. - **Requirements:** - Maximum radial load. - Corresponding maximum oil-film pressure. - Angular location of maximum pressure. Please proceed with the necessary calculations considering the provided rotational speed, clearance fit, and lubricant properties corresponding to the mentioned grades (SAE Grade 40 and SAE Grade 50). The analysis should ensure the operational criteria and constraints are met, particularly regarding temperatures and lubrication film thickness.
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