Noise Reduction of Trains Using the Operational Transfer Path Analysis – Demonstration of the Method and Evaluation by Case Study

Sievi, Alex; Martner, Otto; Lutzenberger, Stefan

doi:10.1007/978-4-431-53927-8_54

Cited by 8 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Transfer path analysis (TPA) is widely used in various engineering fields, such as to improve noise, vibration and harshness (NVH) problems in automotive engineering by identifying sources and calculating the contribution of each source. 35,36 For ships or submarines, TPA studies were triggered by the need to reduce the transmission of engine vibrations in order to make them stealthy. Most of the publications are focused on isolation of ship diesel engines or gas turbines by means of absorbers and decoupling mechanisms 37,38 to minimize the transmission through the interfaces.…”

Section: Transfer Path Analysis Of the Propeller Excitation Forcementioning

confidence: 99%

Coupled vibration characteristics of a submarine propeller-shaft-hull system at low frequency

Chen

2019

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

The coupled longitudinal and transverse vibration characteristics of a submarine propeller-shaft-hull system at low frequency are studied in this paper. Two substructures, which are the propeller-shaft subsystem and the submarine hull, are first modelled using the finite element method. The two substructures are then connected through bearings, which are simplified as longitudinal and lateral springs and dampers. The modes, the natural frequencies and the coupled vibration characteristics of the two substructures and their synthesized system are simulated. An experiment studying the dynamic characteristics of a large-scale submarine test-rig is proceeded and compared with the numerical results, showing great consistency. Finally, transfer path analysis of the low frequency excitation forces using power flow method is discussed.

show abstract

Section: Transfer Path Analysis Of the Propeller Excitation Forcementioning

confidence: 99%

Coupled vibration characteristics of a submarine propeller-shaft-hull system at low frequency

Chen

2019

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

show abstract

“…Hardy and Jones [21] studied the British Railways and identified the sources of internal noise which the structure-borne noise from the bogie was a major contributor to the low frequency. Sievi et al [22,23] applied the OTPA method in the field of rail transit to analyze the cause of excess noise in the passenger room above the trailer bogie without traction motor and investigated several train tpyes to find out that the higher the maximum vehicle speed, the higher was the importance of structure-borne noise. Ström [24] studied the OTPA method as a reliable way to identify the noise source contribution via simulation, and applied it to the highspeed train at speed of 120 km/h below the frequency of 500 Hz, which results showed that the airborne noise contributes more in the high frequency bands, while the yaw dampers and traction rods contributed more in the structure-borne noise.…”

Section: Introductionmentioning

confidence: 99%

An investigation into high-speed train interior noise with operational transfer path analysis method

Zhu

Deng

et al. 2021

Rail. Eng. Science

View full text Add to dashboard Cite

Passengers' demands for riding comfort have been getting higher and higher as the high-speed railway develops. Scientific methods to analyze the interior noise of the high-speed train are needed and the operational transfer path analysis (OTPA) method provides a theoretical basis and guidance for the noise control of the train and overcomes the shortcomings of the traditional method, which has high test efficiency and can be carried out during the working state of the targeted machine. The OTPA model is established from the aspects of "path reference point-target point" and "sound source reference point-target point". As for the mechanism of the noise transmission path, an assumption is made that the direct sound propagation is ignored, and the symmetric sound source and the symmetric path are merged. Using the operational test data and the OTPA method, combined with the results of spherical array sound source identification, the path contribution and sound source contribution of the interior noise are analyzed, respectively, from aspects of the total value and spectrum. The results show that the OTPA conforms to the calculation results of the spherical array sound source identification. At low speed, the contribution of the floor path and the contribution of the bogie sources are dominant. When the speed is greater than 300 km/h, the contribution of the roof path is dominant. Moreover, for the carriage with a pantograph, the lifted pantograph is an obvious source. The noise from the exterior sources of the train transfer into the interior mainly through the form of structural excitation, and the contribution of air excitation is non-significant. Certain analyses of train parts provide guides for the interior noise control.

show abstract

“…Transfer path analysis methods mainly include experimental approaches 6,7 and time-domain identification simulation. 8,9 Among them, experimental approaches can directly yield the transfer function through the hammer test.…”

Section: Introductionmentioning

confidence: 99%

Kalman filter identification method for micro-vibration transfer paths of satellites

Shen

Yang

Sheng

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

Micro-vibrations on-board a satellite have degrading effects on the performance of certain payloads like observation cameras. The major sources of vibrations include momentum wheels, solar array drives, other rotary mechanical equipment, etc. These vibrations result in loss of the pointing precision and image quality of the payload through intricate transfer paths. To improve the accuracy of a satellite system with many vibration sources and complex transfer paths, it is necessary to determine the main transfer path of vibration. In this study, a path identification method is proposed and applied to the transfer system from the momentum wheel to the camera mount. First, the observer/Kalman filter identification (OKID) algorithm is used to acquire the state-space equation of each path subsystem. Then, the subsystem order is obtained based on the slope of the singular entropy increment. In the next phase, combined with the measured disturbance force of the momentum wheel, the displacement response of the target point is predicted. Finally, the dominant transfer path of vibration is achieved by calculating the vibration contribution of each path to the response point. The results indicate that the dominant transfer path is the axial path of the horizontal momentum wheel, which contributes to the vibration of the camera mount at most. Effective vibration reduction measures should be taken to this path to suppress the vibration signal. In comparing the identified displacement response with the finite element response of the camera mount under different noise conditions, the correlation coefficients are >0.85, which proves the accuracy and anti-noise capability of the identification method.

show abstract

Noise Reduction of Trains Using the Operational Transfer Path Analysis – Demonstration of the Method and Evaluation by Case Study

Cited by 8 publications

References 1 publication

Coupled vibration characteristics of a submarine propeller-shaft-hull system at low frequency

Coupled vibration characteristics of a submarine propeller-shaft-hull system at low frequency

An investigation into high-speed train interior noise with operational transfer path analysis method

Kalman filter identification method for micro-vibration transfer paths of satellites

Contact Info

Product

Resources

About