codeproject vb.net barcode generator Typical values of the unit load are given in Table 19.8. in Software

Creator EAN-13 Supplement 5 in Software Typical values of the unit load are given in Table 19.8.

Typical values of the unit load are given in Table 19.8.
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TABLE 19.8 Range of Unit Loads for Various Applications
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4. The Sommerfeld number S is a dimensionless parameter that characterizes bearing performance; large S (say, greater than 0.15) indicates a lightly loaded bearing operating at a small eccentricity. The Sommerfeld number may be calculated from S= UL R W C
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5. The attitude angle is the angular distance between the load line and the line of centers (Fig. 19.1). It locates the minimum film thickness as measured from the load line. Because WR = W cos and WT = W sin , = tan 1 WT WR
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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JOURNAL BEARINGS 19.18
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BEARINGS AND LUBRICATION
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19.5.2 Bearing Friction Relations Four parameters are involved with the frictional behavior of a journal bearing: 1. The shear stress , acting on either the shaft or the bearing surface, consists of two terms; one is due to motion of the shaft (pure shear), and the other is due to the circumferential pressure distribution (pressure-induced shear): = h p U 2R h
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The plus sign corresponds to the shear stress on the journal surface; the minus sign, to the shear stress on the bearing surface. 2. The frictional force acting on the journal Fj is found by integrating the pure shear stress over the entire surface of the journal and the pressure-induced shear stress up to the trailing edge of the film. This yields Fj = 2 R WT C ( UL) + 1 2 C 2 R
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3. The friction coefficient f is the ratio of the journal frictional force to the bearing load: f= Fj W
The friction variable is the product (R/C)(f ) and so may be written 2 2 R sin (f ) = (S) + 1 2 C 2 4. The power that must be supplied to the journal to overcome friction is called the frictional horsepower loss HP, and it may be computed from HP = C1Fj U = C2 f WRN where C1 and C2 depend on the system of units. For Fj in pounds (lb) and U in inches per second (in/s), C1 = 1 6600 for W (lb), R (in), and N in revolutions per second (r/s), C2 = 2 C1 = 9.51998 10 4. The relevant geometry for the execution of these tasks is depicted in Fig. 19.5.
19.5.3 Lubricant Flow Relations Lubricant flow rates are needed to estimate the capacity of the lubricant supply system and to determine the cooling requirements of the bearing. This involves evaluation of the lubricant flow within the clearance space, the lubricant flow that leaks out the sides of the bearing, and the lubricant flow that is supplied to the bearing.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
JOURNAL BEARINGS 19.19
JOURNAL BEARINGS
In general, volume flow rate per unit length is composed of a term due to surface motion (shear flow) and another due to the pressure (pressure-induced flow). Journal bearing circumferential and axial flows per unit length are q = h3 p Uh 12 R 2 qz = h3 p 12 z (19.9) The total flow rates may be found by integrating Eq. (19.9) across the bearing length for the circumferential flow rate FIGURE 19.5 Film thickness geometry and around the bearing circumference for the axial flow rate. Assuming that lubricant is supplied in the unloaded portion of the bearing (Fig.19.6), we see that the rate at which lubricant leaks out of the active portion of the film is Qsa = Q1 Q2 (19.10)
where Q1 = flow into the leading edge of the film and Q2 = flow out of the trailing edge. When the input flow rate equals the leakage flow rate, Q1 is called the classical rate. For given values of W, U, and , the classical rate is the largest flow that can be carried into the active film by shaft rotation. However, in practice, Qi , the input flow rate, may be greater (the flooded condition) or less (the starved condition) than the appropriate value to achieve the classical rate. For flooded conditions, side flow will also occur in the unloaded portion of the bearing, and we may write
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