Question
Download Solution PDFA rotor has a mass of 12 kg and is mounted midway on a horizontal shaft which is supported at the ends by two bearings (assumed as simply supported). The bearings are 1 m apart. What will be the critical (whirling) speed of the shaft? [EI = 4 kN - m2, g = 10 m/s2]
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
For a simply supported shaft with a rotor (concentrated mass) at the center, the critical (whirling) speed is determined using the relation:
Where,
Static deflection at center of simply supported shaft due to point load is given by:
Calculation:
Given:
Mass of rotor,
Span of shaft,
Substitute in deflection formula:
Now, critical speed:
Last updated on Jul 8, 2025
-> The BHEL Cut Off 2025 has been uploaded on July 8, 2025 at the official website
-> BHEL Engineer Trainee result has been released on July 8.
-> BHEL Engineer Trainee answer key 2025 has been released at the official website.
-> The BHEL Engineer Trainee Admit Card 2025 has been released on the official website.
->The BHEL Engineer Trainee Exam 2025 will be conducted on April 11th, 12th and 13th, 2025
-> BHEL Engineer Trainee 2025 Notification has been released on the official website.
-> A total of 150 Vacancies have been announced for various disciplines of Engineering like Mechanical, Electrical, Civil, etc.
-> Interested and eligible candidates can apply from 1st February 2025 to 28th February 2025.
-> The authorities has also released the BHEL Engineer Trainee Pattern
-> The BHEL Engineer Trainee Selection Process is divided into two stages namely Written Test and Interview.
-> The selected candidates for the Engineer Trainee post will get a salary range between Rs. 60,000 - Rs. 1,80,000.