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NVH benefit of the Frunk

Autoneum Management AG-Federico Di Marco, Flavio Pezzani, Andreas Daving, Luca Mazzarella
  • Technical Paper
  • 2019-01-1456
To be published on 2019-06-05 by SAE International in United States
Due to the increasing number of battery electric vehicles (BEVs), the engineering fields regarding driving comfort and NVH issues are becoming more and more challenging: many new factors affect the development of BEVs NVH package. The noise sources related to the powertrain are different from the traditional ones of internal combustion engines, for instance due to the presence of tonal components, strong harmonics and potential whining noise. To satisfy NVH specifications and the need for lightweight solutions to increase driving range, it is important to mask as much as possible the noise coming from the engine bay with materials both lightweight and acoustically performing. Moreover, for electric vehicles new interesting solutions are possible with the introduction of new components, that do not find room under the hood of ICE or hybrid vehicles. These components, if properly designed, could lead to non-negligible NVH benefits. The present paper reports the NVH effects of one of these new components, the frunk, a small compartment inside the engine bay, functionally similar to the trunk. In this paper, the design-by-simulation…

Fast broadband curved Insertion Loss simulation of an inner dash insulator using a cylindrical Transfer Matrix Method spectral approach

Interac-Gerard Borello
Treves-Arnaud Duval, Mickael Goret
  • Technical Paper
  • 2019-01-1583
To be published on 2019-06-05 by SAE International in United States
Middle and high frequency vibro-acoustic simulation of complex shape insulators requires using 3D poroelastic finite elements either for the whole part (up to 2500 Hz maximum) or through singly curved pre-computed Insertion Losses (up to 5000 Hz maximum) to be introduced in large SEA or energy-based models. Indeed, a dependence of the Insertion Loss slopes of noise treatments following the curvature is observed both experimentally and numerically. Beyond frequency range limitations, poroelastic finite elements computations take too much time of typically a few hours each, following all curvatures and thickness 3D maps. A cylindrical Transfer Matrix Method spectral approach allows computing the singly curved Insertion Losses up to 10 kHz in a few minutes only. This is a huge simplification for the SEA modeling effort enabling easier and more precise fully trimmed vehicle middle and high frequency vibro-acoustic simulations. A dash insulator Insertion Loss numerical validation case will be presented comparing all methods with one another.

Simulation Analysis of a Dual-purpose Intelligent Mobile Platform for Highway and Railway

University of Science & Development-Wenming Zhang SUN
  • Technical Paper
  • 2019-01-1499
To be published on 2019-06-05 by SAE International in United States
Railways play a huge role in China's transportation industry. In order to ensure intelligence, advanced technology, and high efficiency in functions such as railway inspection, rescue, and transportation, a dual-purpose intelligent mobile platform for both roads and railways was developed. Due to the height limitation of this platform, resilient wheels and rubber dampers with short stroke are used as the suspension system for the rail chassis. Based on this special suspension form, the dynamic model of the whole platform is derived, and the simulation model of the whole platform is established in SIMPACK software. The effects of resilient wheels’ axial stiffness, radial stiffness and vertical stiffness, lateral stiffness of rubber dampers on the vertical and lateral smoothness of the platform were studied. It is found that the increase of the radial stiffness of the resilient wheels will deteriorate the vertical smoothness and lateral smoothness of the platform. The increase in the axial stiffness of the resilient wheels will deteriorate the vertical smoothness of the platform and the lateral smoothness will be improved. The increase of…

Structural Vibration and Acoustic Analysis of a 3-Phase AC Induction Motor

Peyman Poozesh
Kettering Univ-Allan Taylor, Javad Baqersad
  • Technical Paper
  • 2019-01-1458
To be published on 2019-06-05 by SAE International in United States
This paper is aimed at studying the NVH and acoustic performance of a 3-phase AC induction motor in order to find a way to reduce the magnetic component of noise from an electric motor in an electric vehicle (EV). The method suggested here is to reduce the magnetic component of sound from the motor by making modifications to the end bracket of the motor housing. EVs are being considered the future of mobility mainly owing to the fact that they are environment-friendly. With a lot of companies already investing heavily in this technology, electric drives are set to become extremely popular in the years to come. The heart of an EV is its motor. Modern electric vehicles are quiet and with the lack of an IC engine to mask most sounds from other components, the sound from the electric motor and other auxiliary parts become more prominent. This paper lays down a process to analyze the sound radiated from the electric motor in three broad steps. First, to model the motor in an electromagnetic platform,…

New acoustic material for vehicle applications and measurement techniques to determine absorption coefficient for small size test samples

Mikromasch Eesti Ltd-Anna Kozmenkova
Tallinn University of Technology-Jüri Lavrentjev, Hans Rämmal
  • Technical Paper
  • 2019-01-1585
To be published on 2019-06-05 by SAE International in United States
A new sound absorbing material for vehicle applications is presented and acoustic properties are investigated in this paper. The material is made of natural leather collagen and inhibits unique characteristics of genuine leather. Production technology uses the residues of leather industry, is ecofriendly and allows fabrication of the parts of any shape. The price is competitive to synthetic polymers. Absorption coefficient is one of the most commonly used parameters to characterize acoustic properties of materials. There are two main techniques to experimentally determine the absorption coefficient: the impedance tube transfer function method and reverberant room method. In the second case the absorption coefficient is determined at random incident sound field while in the impedance tube only direct incident field is considered. The main advantage of the first method however is the small size of samples. Therefore the impedance tube method was preferred in this investigation, since in the developing process of new material only small samples were available. The standard reverberation room method is limited to minimum size of samples of 10m2. In the paper…

Features of Mathematical Modeling in Problems of Determining the Engine Power by the Parameters of the Exhaust Gas Turbocharger

Odessa National Maritime University-Andrii Golovan
  • Technical Paper
  • 2019-01-1497
To be published on 2019-06-05 by SAE International in United States
The features of modeling the working process of a turbocharged marine engine in order to reveal the relationship between the engine power and the operation modes of a gas turbocharger are discussed in the article. Based on the results of modeling, a model was obtained for the dependence of the power of the internal combustion engine on the parameters of the exhaust gas turbocharger operation. As a basic parameter of the gas turbocharger operation, the rotor speed was chosen. The scavenging air temperature is selected as an additional parameter. The article shows the results of experimental studies to determine the performance of a gas turbocharger at various modes of operation of a marine internal combustion engine. The article describes the structure of a diagnostic system that allows recording the operating modes of a gas turbocharger in a non-contact method. The use of experimental data in the verification of simulation results has made it possible to reduce the error in determining the power of an internal combustion engine by 5-10%. The described method for estimating the…

CAE Methods for Predicting Radiated Noise From Large Diameter Single-Piece Aluminum Propeller Shafts With Liner Treatments

General Motors-Rajith R. Jayaratne, Yu Liu, Mark Gehringer, Jeff Rayce, Wallace Hill
  • Technical Paper
  • 2019-01-1560
To be published on 2019-06-05 by SAE International in United States
In recent truck applications, single-piece large-diameter propshafts, in lieu of two-piece propshafts, have become more prevalent to reduce cost and mass. These large-diameter props, however, amplify driveline radiated noise. The challenge presented is to optimize prop shaft modal tuning to achieve acceptable radiated noise levels. This paper will cover the development of a two-step CAE method to predict modal characteristics and airborne noise sensitivities of large-diameter single piece aluminum propshafts fitted with different liner treatments. The first step is the use of a traditional CAE software to calculate prop surface response. The second step is a boundary element simulation to calculate prop surface radiating noise under the excitation obtained from the first step. Finally, test data, acceleration and acoustic, in both subsystem and vehicle levels are presented to assess the accuracy of the CAE method. The new CAE method can dramatically benefit driveline N&V integration, such as prop liner selection or prop modes tuning to reduce the driveline noise.

Blocked force determination on an engine cover

Univ of Kentucky-David Herrin
Univ. of Kentucky-Keyu Chen
  • Technical Paper
  • 2019-01-1525
To be published on 2019-06-05 by SAE International in United States
Blocked force determination is an alternative to the more customary method of using transfer path analysis to determine inverse forces. The primary advantage of the approach is that the source does not need to be detached from the machine. Results are valid so long as the source and machine are intact and the blocked forces are determined at the interface between the source and machine. In this research, an engine cover considered as receiver is bolted on a plastic source plate and electrical shaker is used to excite the plastic plate. Blocked forces are calculated on the bolts between engine cover and plastic plate and virtual blocked forces are also calculated on a virtual interface on engine cover. The accuracy of calculated blocked forces is assessed by comparing the predicted and simulated responses at selected receiver points which were not used for the inverse force analysis.

Fault Feature Extraction of Elliptically Shaped Bearing Raceway

South China University of Technology-Yingying Guo, Xuezhi Zhao
  • Technical Paper
  • 2019-01-1564
To be published on 2019-06-05 by SAE International in United States
The elliptically shaped bearing (ESB) with a rigid, elliptical inner race and a flexible, thin-walled outer race is the most easily damaged core component of harmonic drive. The ESB rotates under cycle load of alternating stress due to its special elliptic structure. Hence, the impact noise produced by alternating between long axis and short axis is apt to conceal the fault features of ESB such as fatigue spalling and pitting. In order to diagnose the fault on raceway surface of ESB, a new method of CMWT-FH based on Continuous Morlet Wavelet Transform (CMWT) and FFT-based Hilbert (FH) spectrum analysis is proposed to extract the fault feature. First, the formulas of fault feature frequency is deduced based on the geometry and kinematic characteristic of ESB; then the CMWT method is employed to decompose the fault signal of ESB; finally, the FH spectrum analysis is performed to extract the fault feature frequency of ESB from the decomposition signal with the largest kurtosis value in the first several layers. Compared with the conventional FH method, the proposed CMWT-FH…

Broadband Membrane-type Acoustic Metamaterial Structures with Polymorphic Anti-resonance Modes

Gissing Tech. Co., Ltd.-Qianqian Zhang, Xiujie Tian, Wei Huang, Keda Zhu
Xi’an Jiaotong University-Guojian Zhou, Jiu Hui Wu
  • Technical Paper
  • 2019-01-1574
To be published on 2019-06-05 by SAE International in United States
The researches indicate that rational design of membrane-type acoustic metamaterial (MAM) can make it have a high sound transmission loss (STL) at the anti-resonant frequency. Based on the principle of local resonance of acoustic metamaterials, this paper studied the coupling interactions between sound field and vibration modes, and designed four lightweight MAM structural units with different distributed harmonic oscillators, and then the anti-resonant behaviors of different units within the low frequency were gradually analyzed. The regulation mechanism of continuous polymorphic anti-resonance modes on broadening STL bandwidth was further revealed, and the STL characteristics have been verified within the low-frequency range by numerical simulation and experiments. The results show that the design of a single cross-shaped resonator can increase the diversity of anti-resonance modes and eliminate the node-circular-type resonance mode, then ensure the wider STL bandwidth. Furthermore, four metal platelets set symmetrically between the swing arms based on the unit above increase the local anti-resonance modes of the new unit, which greatly expand the STL bandwidth by shifting its upper limit to the right. In addition,…