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Problem 1 (20 pts) The blade of a turbine rotates at a speed of 7,500 rpm. Assuming that the blad...
Select the most suitable material from the table that can be used to manufacture jet turbine...
Select the most suitable material from the table that can be
used to manufacture jet turbine blades under the following
conditions:
a. The jet turbine rotates at a velocity of 30,000 rpm.
b. The Turbine disc is 52.5 cm, the cross sectional area is 15
cm2, and the length is 10cm.
Material Allowable stress GPa 3.8 6.1 6.1 6.5 6.1 Densi Ductility Cost gim cc Adamantina Chromanit Duracon Stumatalo Framion 8.3 8.9 9.0 35% 5% 3390 35% 33% 4,000 2,000...
Problem 4: A rotary lawnmower blade rotates at 3500 rev/min. The steel blade has a uniform cross section in thick 8 by 1 in wide, and has a 2-in-diameter hole in the center as shown in the figure. Es...
Problem 4: A rotary lawnmower blade rotates at 3500 rev/min. The steel blade has a uniform cross section in thick 8 by 1 in wide, and has a 2-in-diameter hole in the center as shown in the figure. Estimate the nominal 4 tensile stress at the central section due to rotation. 20 in L in 40 in Problem 4
Problem 4: A rotary lawnmower blade rotates at 3500 rev/min. The steel blade has a uniform cross section in thick 8...
1. Consider a bar under tension. The bar has length L, rectangular cross-section of sides b...
1. Consider a bar under tension. The bar has length L, rectangular cross-section of sides b and h, Young's modulus E, density p, and applied tensile force P. a) If all parameters are fixed except for h, find the value of h that minimizes the mass of the bar under stress, elongation, and stiffness constraints. Assume safety factors oo, Os, and Ok and failure values o*, 8*, and k* b) Also find the minimum mass of the bar m under...
3. Power transmission is an important engineering application and relies on the integrity of the shaft designs. Assume a solid, circular steel shaft with a uniform diameter d 50 mm and a total le...
3. Power transmission is an important engineering application and relies on the integrity of the shaft designs. Assume a solid, circular steel shaft with a uniform diameter d 50 mm and a total length I3 m. At its midpoint, a belt passes over a pulley and delivers 50 kW power to the shaft. This power is used to drive two machines at either end of the shaft. Machine 1 consumes P1 20 kW and machine 2 uses P230 KW. The...
PROBLEM: A simply supported beam is subjected to a harmonic load F(t)-Fo sin ณ at mid-span as a result of the operation of a mechanical system that rotates at a constant speed n rev/min. The beam is...
PROBLEM: A simply supported beam is subjected to a harmonic load F(t)-Fo sin ณ at mid-span as a result of the operation of a mechanical system that rotates at a constant speed n rev/min. The beam is made from steel with an elasticity modulus E 29x103 ksi and specific weight 490 lb/ft3. The beam has a cross-sectional area A = 1.59 in, a moment of inertia 1 = 3.85 in, and an approximate viscous damping factor 0.05. The length between...
1. A cross- flow, horizontal shaft, paddle-wheel flocculation basin is to be designed for a flow...
1. A cross- flow, horizontal shaft, paddle-wheel flocculation basin is to be designed for a flow of 20.000 m ld a mean velocity gradient of 33.33 s (at 10 C), and a detention time of 45 min. The GT value should be from 50,000 to 100,000. Tapered flocculation is to be provided, and three compartments of equal depth in series are to be used, as shown in Figure 1. The G values determined from laboratory tests for the three compartments...
Select the most suitable material from the table that can be
used to manufacture jet turbine blades under the following
conditions:
a. The jet turbine rotates at a velocity of 30,000 rpm.
b. The Turbine disc is 52.5 cm, the cross sectional area is 15
cm2, and the length is 10cm.
Material Allowable stress GPa 3.8 6.1 6.1 6.5 6.1 Densi Ductility Cost gim cc Adamantina Chromanit Duracon Stumatalo Framion 8.3 8.9 9.0 35% 5% 3390 35% 33% 4,000 2,000...
Problem 4: A rotary lawnmower blade rotates at 3500 rev/min. The steel blade has a uniform cross section in thick 8 by 1 in wide, and has a 2-in-diameter hole in the center as shown in the figure. Estimate the nominal 4 tensile stress at the central section due to rotation. 20 in L in 40 in Problem 4
Problem 4: A rotary lawnmower blade rotates at 3500 rev/min. The steel blade has a uniform cross section in thick 8...
1. Consider a bar under tension. The bar has length L, rectangular cross-section of sides b and h, Young's modulus E, density p, and applied tensile force P. a) If all parameters are fixed except for h, find the value of h that minimizes the mass of the bar under stress, elongation, and stiffness constraints. Assume safety factors oo, Os, and Ok and failure values o*, 8*, and k* b) Also find the minimum mass of the bar m under...
3. Power transmission is an important engineering application and relies on the integrity of the shaft designs. Assume a solid, circular steel shaft with a uniform diameter d 50 mm and a total length I3 m. At its midpoint, a belt passes over a pulley and delivers 50 kW power to the shaft. This power is used to drive two machines at either end of the shaft. Machine 1 consumes P1 20 kW and machine 2 uses P230 KW. The...
PROBLEM: A simply supported beam is subjected to a harmonic load F(t)-Fo sin ณ at mid-span as a result of the operation of a mechanical system that rotates at a constant speed n rev/min. The beam is made from steel with an elasticity modulus E 29x103 ksi and specific weight 490 lb/ft3. The beam has a cross-sectional area A = 1.59 in, a moment of inertia 1 = 3.85 in, and an approximate viscous damping factor 0.05. The length between...
1. A cross- flow, horizontal shaft, paddle-wheel flocculation basin is to be designed for a flow of 20.000 m ld a mean velocity gradient of 33.33 s (at 10 C), and a detention time of 45 min. The GT value should be from 50,000 to 100,000. Tapered flocculation is to be provided, and three compartments of equal depth in series are to be used, as shown in Figure 1. The G values determined from laboratory tests for the three compartments...
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