ELGI Equipments Acoustical Engineer Interview Questions, Process, and Tips

Antifriction bearings use rolling elements to reduce friction, while journal bearings use a sliding motion.

• Antifriction bearings use rolling elements like balls or rollers to reduce friction, while journal bearings use a sliding motion between the bearing surface and the shaft.

• Antifriction bearings have lower friction and higher efficiency compared to journal bearings.

• Examples of antifriction bearings include ball bear...read more

Modal analysis of rigid body equation involves calculating natural frequencies and mode shapes.

• Modal analysis involves determining the natural frequencies and mode shapes of a system.

• The equation for modal analysis of a rigid body is typically represented as Kx = Mw^2x, where K is the stiffness matrix, M is the mass matrix, w is the angular frequency, and x is the mode shape vector.

• The modal analysis equation helps in ...read more

Mass matrix is a mathematical representation of the mass distribution of a system in structural dynamics.

• Mass matrix is used in structural dynamics to represent the mass distribution of a system.

• It is a square matrix that relates the accelerations of different points in a structure to the forces acting on those points.

• The mass matrix is typically diagonal for systems with uniform mass distribution.

• In finite element ana...read more

Eigen values for free vibration represent the natural frequencies at which a system will vibrate without any external forces.

• Eigen values are the values of natural frequencies at which a system vibrates without any external forces.

• They are obtained by solving the characteristic equation of the system.

• Each eigen value corresponds to a mode shape, which describes the pattern of vibration.

• Higher eigen values indicate high...read more

Frequency can be derived from free/forced vibrations by analyzing the period of the vibrations.

• Frequency is the reciprocal of the period of the vibration.

• For free vibrations, the natural frequency of the system can be determined by analyzing the oscillations without any external force.

• For forced vibrations, the frequency can be determined by analyzing the response of the system to an external force at different frequen...read more