FSD3110 Structure Borne Sound 7.5 credits

Structure borne sound refers to noise that is originated by vibration sources and the transmission of these vibrations to an element that can radiate sound. According to the source-transmission-radiator-receiver model, and since minimizing the source of vibration is often not feasible, the most effective way to minimize structure borne sound is to minimize the transmission of vibrations. This course is about how vibrations are transmitted in structures and how the transmission can be minimized. To this end we learn about structural wave types such as longitudinal and bending wave and how to determine the energy input to these waves for several forcing conditions. Furthermore we learn about how wave are transmitted and reflected and how to model damping in beam and plate structures.

Students graduating from the course should:

• Have knowledge about the concepts and methods used to describe and analyse vibrations in both discrete and continuous systems
• Be able to derive the homogeneous wave equations and their solution for the different types of waves in structures
• Understand the concepts of mobility, impedance, energy and power and be able to derive their corresponding expressions all structural wave types
• Be able to describe the transmission of reflection of structural waves in complex junctions and derive expressions for reflection and transmission coefficients
• Understand the different discrete damping models, the concept of loss factor and the implications of damping for the vibration response of beams and plates
• Be able to derive expressions for the loss factors of plates with attached layers

Masters degree in mechanical engineering, vehicle engineering, engineering physics or equivalent. Documented knowledge of English corresponding to English B / English 6.

Structure Borne Sound, 3rd edition, Cremer, Heckl and Petersson

If the course is discontinued, students may request to be examined during the following two academic years.

• SEM1 - Seminar, 2.5 credits, grading scale: P, F
• TEN1 - Exam, 5.0 credits, grading scale: P, F

Based on recommendation from KTH’s coordinator for disabilities, the examiner will decide how to adapt an examination for students with documented disability.

The examiner may apply another examination format when re-examining individual students.

Oral exam takes place in groups.

Participation in course seminars, assignments and oral exam.

Romain Rumpler

• All members of a group are responsible for the group's work.
• In any assessment, every student shall honestly disclose any help received and sources used.
• In an oral assessment, every student shall be able to present and answer questions about the entire assignment and solution.