The United States Navy sponsored Truss Damping Program is a research study in the area of submarine noise reduction. The research explores the feasibility of effectively attenuating noise associated with vibration of rotating machinery by means of a truss support structure. Such a structure occupies the entire machinery space by supporting all internal equipment. This thesis explores the dynami...

A laboratory-based experiment procedure of reception plate method for structure-borne sound source characterisation is reported in this paper. The method uses the assumption that the input power from the source installed on the plate is equal to the power dissipated by the plate. In this experiment, rectangular plates having high and low mobility relative to that of the source were used as the ...

This paper will describe how experimental modal testing can be used for designing and determining the effectiveness of add-on damping systems for small structures or substructures. These add-on damping systems, also known as surface damping treatments. have been in use for over 30 years as a means of reducing the response of a structure subjected to vibratory loads. By adding damping to the str...

In order to detect knock in spark plug engines generally structure–borne sound signals measured by acceleration sensors mounted on the engine housing are used. At test bed engines additional pressure sensors measuring the pressure inside the combustion chamber deliver a reference signal to adjust the parameters of knock detection based on the sound signal. We show by experimental results that t...

Structure borne noise induced by vibrating systems is considered as a major contribution to the generated inside vehicles and can be assessed using Transfer Path Analysis (TPA) methods. Their theoretical formulation requires mobility of either system, receiving structure or assembly two components according all Degrees Freedom (DoFs). However, rotational in-plane DoFs cannot measured easily the...

Abstract Vibration and noise aspects play a relevant role in the lifetime comfort of urban areas their residents. Among different sources, one coming from rail transit system will central concern following years due to its sustainability. Ground-borne vibration assessment as well techniques mitigate them become key elements environmental impact global enlargement planned for railway industry. T...

This article presents a new subspace-based technique for reducing the noise of signals in time-series. In the proposed approach, the signal is initially represented as a data matrix. Then using Singular Value Decomposition (SVD), noisy data matrix is divided into signal subspace and noise subspace. In this subspace division, each derivative of the singular values with respect to rank order is u...