Frequency analysis of non-uniform bolted beams

Purohit, B (2015) Frequency analysis of non-uniform bolted beams. Masters thesis, Indian Institute of Technology Hyderabad.

ME13M1005.pdf - Submitted Version

Download (11MB) | Preview


Modal analysis of non-uniform bolted structures are of critical significance in modeling many complex mechanical structures such as airplanes, missiles, ships, etc. The study of vibration is of foremost importance when it comes to mechanical and aerospace applications. The vibration measurement is a powerful but a sophisticated tool for designing mechanical structures. It helps to unravel critical system dynamics and hence designing the model in a better way. The use of joints is important for a mechanical structure as due to its compatibility and access. A seamless mechanical structure of large dimensions is difficult to be made hence the use of joints is required. There are vast literatures available related with the analytical as well as numerical modeling of bolted joint. The bolted joints are classified on the basis of frictional force, extension of joint, loading, etc. There exist different models like Iwan model, Bou-Wen model, etc for modeling of bolted joint. For our case we take the bolted joint as a torsional spring with no damping effect. The use of torsional spring is inspired by the mechanics of the studied structure. The torsional spring takes care of the moment that is transferred at the joint and as there is no axial force acting at the joint the need of linear spring is not required. However, most of the analytical model discuss about the modeling of first mode of uniform structures with bolted joint. In this thesis, we present the modeling of single as well as bolted non-uniform beams using approximate mode shapes for higher modes. To develop the model, we first studied a simply supported beam using approximate mode shape method. The study is done for obtaining higher modes of single non-uniform beams and then the work is extended for bolted beams with three sections. The results are verified using numerical study. We present the study for second and third vibrational modes as compared to previous works for first mode.

[error in script]
IITH Creators:
IITH CreatorsORCiD
Item Type: Thesis (Masters)
Uncontrolled Keywords: Frequency Analysis, Non-Uniform, Bolted Structures, TD340
Subjects: Others > Mechanics
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Library Staff
Date Deposited: 24 Jun 2015 11:39
Last Modified: 14 May 2019 10:38
Publisher URL:
Related URLs:

Actions (login required)

View Item View Item
Statistics for RAIITH ePrint 1596 Statistics for this ePrint Item