Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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Q.38
A tappet valve mechanism in an IC engine comprises a rocker arm ABC that is hinged
at B as shown in the figure. The rocker is assumed rigid and it oscillates about the hinge
B. The mass moment of inertia of the rocker about B is 10-4 kgm². The rocker arm
dimensions are a = 3.5 cm and b = 2.5 cm. A pushrod pushes the rocker at location
A, when moved vertically by a cam that rotates at N rpm. The pushrod pushes the rocker
at location A, when moved vertically by a cam that rotates at N rpm. The pushrod is
assumed massless and has a stiffness of 15 N/mm. At the other end C, the rocker pushes
a valve against a spring of stiffness 10 N/mm. The valve is assumed massless and
rigid.
Hinge B
A
C
幸
Rocker
Spring
Push rod
Valve
Cylinder head
Cam
Resonance in the rocker system occurs when the cam shaft runs at a speed of.
rpm. [Round off to the nearest integer]
Transcribed Image Text:Q.38 A tappet valve mechanism in an IC engine comprises a rocker arm ABC that is hinged at B as shown in the figure. The rocker is assumed rigid and it oscillates about the hinge B. The mass moment of inertia of the rocker about B is 10-4 kgm². The rocker arm dimensions are a = 3.5 cm and b = 2.5 cm. A pushrod pushes the rocker at location A, when moved vertically by a cam that rotates at N rpm. The pushrod pushes the rocker at location A, when moved vertically by a cam that rotates at N rpm. The pushrod is assumed massless and has a stiffness of 15 N/mm. At the other end C, the rocker pushes a valve against a spring of stiffness 10 N/mm. The valve is assumed massless and rigid. Hinge B A C 幸 Rocker Spring Push rod Valve Cylinder head Cam Resonance in the rocker system occurs when the cam shaft runs at a speed of. rpm. [Round off to the nearest integer]
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