VERIFICATION OF A MODAL TRANSMISSION MODEL TO PREDICT NVH PARAMETERS

Abstract

Manufacturers and buyers of modern vehicles are paying increasing attention to
vibroacoustic performance as the main indicator of comfort. Noise and vibration are undesirable
phenomena and lead to energy losses and a decline in service life, and their reduction is achieved
by using modern methods for optimizing NVH parameters of transmissions. An integral part of
the implementation of this methodology and, at the same time, the goal of the proposed work
is to create a verified modal model of a promising automatic transmission (AT). This modal
model of automatic transmission should adequately describe its vibroacoustic behavior during
operation.
The paper presents the results of the calculated and experimental modal analysis, both of individual parts of AT and assembly of AT. During the experimental study, the LMS Scadas Mobile SCM05 hardware-software complex with Simcenter Testlab software in the Impact Testing
software application was used. The experimental study results were processed in the Simcenter
Testlab Modal Analysis software using the PolyMAX method. The analytical study was carried
out using the Simcenter 3D software product with the Real Engenvalues solver and the subsequent transformation of the obtained results for verification. Verification was carried out by assessing the degree of convergence of modal characteristics using a modal assurance criterion
(MAC). The novelty of the research lies in the development of a verified modal model of a promising AT, which allows optimization of NVH parameters at the early stages of design.
In accordance with the purpose of the work, a verified modal model of a promising AT was
created. As a result of the computational and experimental studies, modal characteristics of individual structural elements and AT were obtained. The results of the study made it possible to
clarify a set of methods and approaches for carrying out studies of modal characteristics, which
can later be used in the design of transport vehicles.