Q3 A Propeller Is Found To Be Unbalanced And The Unbalanced Effect Can Be Assumed As Equivalent To 2 Masses In Planes A 1 (24.44 KiB) Viewed 29 times
Q3 A Propeller Is Found To Be Unbalanced And The Unbalanced Effect Can Be Assumed As Equivalent To 2 Masses In Planes A 2 (21.35 KiB) Viewed 29 times
Q3. A propeller is found to be unbalanced and the unbalanced effect can be assumed as equivalent to 2 masses in planes A and B,4 m apart. If this propeller is to be completely balanced by adding 2 masses to two planes C and D as shown in Figure Q1. Some data of masses (m), radii (r) and angles (θ) of these planes A,C,D and B are shown in the Table 1 below.
(a) Complete table 1 of this Question Paper for all x, mr and mrx values. (8 marks) (b) By drawing mrx diagram, find the mass (kg) and angular position (θ) in plane D. (Suggested scale : 1 cm=20 kg−mm−m ) (12 marks) (c) By drawing mr diagram, find the mass (kg) and angular position (θ) in plane C. ( Suggested scale : 1 cm=20 kg−mm ) (12 marks) (d) Determine the unbalanced force of this propeller at 1000rpm if both masses C and D are taken away. (8 marks)
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