NVH Analysis of Powertrain Start/Stop Transient Phenomenon by using Wavelet Analysis and Time Domain Transfer Path Analysis

2015 ◽  
Author(s):  
Manchi Venkateswara Rao ◽  
S Nataraja Moorthy ◽  
Prasath Raghavendran
Keyword(s):  
Wavelet Analysis ◽  
Path Analysis ◽  
Time Domain ◽  
Transient Phenomenon ◽  
Transfer Path ◽  
Transfer Path Analysis ◽  
Domain Transfer

Time-domain Transfer Path Analysis for Transient Phenomena Applied to Tip-in/Tip-out (Shock & amp; Jerk)

2012 ◽  
Author(s):  
Hirotaka Shiozaki ◽  
Theo Geluk ◽  
Frank Daenen ◽  
Yoshihisa Iwanaga ◽  
Joris Van Herbruggen
Keyword(s):  
Path Analysis ◽  
Time Domain ◽  
Transient Phenomena ◽  
Transfer Path ◽  
Transfer Path Analysis ◽  
Domain Transfer

Time-domain transfer path analysis of multiple moving noise sources

2011 ◽  
Vol 59 (5) ◽  
pp. 541 ◽  
Author(s):  
Sifa Zheng ◽  
Peng Hao ◽  
Xiaomin Lian ◽  
Keqiang Li
Keyword(s):  
Path Analysis ◽  
Time Domain ◽  
Noise Sources ◽  
Transfer Path ◽  
Transfer Path Analysis ◽  
Domain Transfer

scholarly journals Time-Domain Substructure Transient Vibration Transfer Path Analysis Based on Time-Varying Frequency Response Functions under Operational Excitations

2019 ◽  
Vol 2019 ◽  
pp. 1-16
Author(s):  
Rong He ◽  
Hong Zhou
Keyword(s):  
Path Analysis ◽  
Frequency Response ◽  
Time Domain ◽  
Time Varying ◽  
Response Functions ◽  
Transient Vibration ◽  
Transfer Path ◽  
Time Varying Systems ◽  
Transfer Path Analysis ◽  
The Time Domain

The time-domain substructure inverse matrix method has become a popular method to detect and diagnose problems regarding vehicle noise, vibration, and harshness, especially for those impulse excitations caused by roads. However, owning to its reliance on frequency response functions (FRFs), the approach is effective only for time-invariable linear or weak nonlinear systems. This limitation prevents this method from being applied to a typical vehicle suspension substructure, which shows different nonlinear characteristics under different wheel transient loads. In this study, operational excitation was considered as a key factor and applied to calculate dynamic time-varying FRFs to perform accurate time-domain transient vibration transfer path analysis (TPA). The core idea of this novel method is to divide whole coupled substructural relationships into two parts: one involved time-invariable components; normal FRFs could be obtained through tests directly. The other involved numerical computations of the time-domain operational loads matrix and FRFs matrix in static conditions. This method focused on determining dynamic FRFs affected by operational loads, especially the severe transient ones; these loads are difficult to be considered in other classical TPA approaches, such as operational path analysis with exogenous inputs (OPAX) and operational transfer path analysis (OTPA). Experimental results showed that this new approach could overcome the limitations of the traditional time-domain substructure TPA in terms of its strict requirements within time-invariable systems. This is because in the new method, time-varying FRFs were calculated and used, which could make the FRFs at the system level directly adapt to time-varying systems from time to time. In summary, the modified method extends TPA objects studied in time-invariable systems to time-varying systems and, thus, makes a methodology and application innovation compared to traditional the time-domain substructure TPA.

OS0802 Transfer Path Analysis in Time Domain for Input Location Varying Machine

2016 ◽  
Vol 2016.22 (0) ◽  
pp. _OS0802-1_-_OS0802-2_
Author(s):  
Daisuke IWADATE ◽  
Nobuyuki OKUBO ◽  
Takeshi TOI ◽  
kEISUKE SUZUKI ◽  
Seiko SAI
Keyword(s):  
Path Analysis ◽  
Time Domain ◽  
Transfer Path ◽  
Input Location ◽  
Transfer Path Analysis

Vibration Transfer Path Analysis of Double-Layer Box for Marine Reducer

2021 ◽  
Author(s):  
Miaomiao Li ◽  
Qinwen Liu ◽  
Guanghao Dai ◽  
Weifang Chen ◽  
Rupeng Zhu
Keyword(s):  
Path Analysis ◽  
Double Layer ◽  
Transfer Path ◽  
Transfer Path Analysis

scholarly journals Identification of relevant acoustic transfer paths for WT drivetrains with an operational transfer path analysis

2021 ◽  
Author(s):  
W. Schünemann ◽  
R. Schelenz ◽  
G. Jacobs ◽  
W. Vocaet
Keyword(s):  
Path Analysis ◽  
Wind Turbine ◽  
Frequency Response ◽  
Mechanical System ◽  
Reference Point ◽  
Response Functions ◽  
Frequency Response Functions ◽  
Transfer Path ◽  
Transfer Path Analysis ◽  
Turbine Model

AbstractThe aim of a transfer path analysis (TPA) is to view the transmission of vibrations in a mechanical system from the point of excitation over interface points to a reference point. For that matter, the Frequency Response Functions (FRF) of a system or the Transmissibility Matrix is determined and examined in conjunction with the interface forces at the transfer path. This paper will cover the application of an operational TPA for a wind turbine model. In doing so the path contribution of relevant transfer paths are made visible and can be optimized individually.

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