A strategy for developing an inclusive load case for verification of squeak and rattle noises in the car cabin Volvo Car Corporation

Format:

Book

Conference/Event

Author/Creator:

Bayani Khaknejad, Mohsen, author.

Contributor:

Blom, Rasmus

Nilsson, Jonatan

Söderberg, Rikard

Wickman, Casper

Conference Name:

Noise and Vibration Conference & Exhibition (2021-09-07 : Grand Rapids & Online, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

Squeak and rattle (S&R) are nonstationary annoying andunwanted noises in the car cabin that result in considerablewarranty costs for car manufacturers. Introduction of cars withremarkably lower background noises and the recent emphasis onelectrification and autonomous driving further stress the need forproducing squeak- and rattle-free cars. Automotive manufacturersuse several standard test tracks for physical evaluation andverification of S&R. The excitation signals collected fromthese road profiles are also employed in subsystem rig tests andcomputer simulations that are gradually replacing physical fullvehicle testing. Considering the need for shorter lead time andintroduction of optimisation loops, it is necessary to optimise theexcitation load cases for efficient S&R evaluation. In thisstudy, different road profiles used for S&R physicalverification were studied and a method was developed to truncateand select important parts of the excitation signals to merge anddevelop one representative excitation load case. The criteria forsignal truncation was based on the squeak and rattle risk andseverity metrics calculated form the vibration response at thecritical interfaces for S&R. The case study was an instrumentpanel of a passenger car and the results of computer simulation andrig test were compared with the complete vehicle test. A strategyto create the worst excitation load case by combining the truncatedparts of all excitation signals was presented and the results werevalidated by physical testing through measuring vibration signals.It was shown that it is possible to replace the S&R excitationsignals by one single representative worst load case, while S&Rrisk prediction from the system response was kept reliable. Thisresults in speeding up the physical and virtual verification ofS&R in the development process of passenger cars

Notes:

Vendor supplied data

Publisher Number:

2021-01-1088

Access Restriction:

Restricted for use by site license