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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…

Modeling and Validation for the Hysteretic Behavior of an Automatic Belt Tensioner

BYD Auto Industry Company Limited-Pu Xu
South China Univ of Technology-Xuezhi Zhao
  • Technical Paper
  • 2019-01-1546
To be published on 2019-06-05 by SAE International in United States
An automatic tensioner used in an engine front end accessory drive system (EFEADS) is taken as a study example in this paper. The output torque of the tensioner, which consists of the spring torque caused by a torsional spring, the damping torque caused by damping parts, and the frictional torques caused by a bushing and a rotational arm of tensioner, is analyzed by a mathematic analysis method and a finite element method. And the calculation and simulation are validated by a torque measurement versus angular displacement of a tensioner arm. The output torques of the tensioner under a loading and an unloading process are described by a bilinear hysteretic model, and are written as a function with a damping ratio. The rule of the action for the damping parts is investigated based on the simulation and a durability test of the tensioner. A finite element method for the tensioner without damping part is established. Then the radial deformation for the torsional spring under an unconstrained state is analyzed. The analysis results have a good correlation…

Model Verification of CAE with NVH-test Acting on Downsized Car Engines

Automotive Powertrain CAE NVH-Urban Rönnqvist
NVH-testing Powertrain-Janos Ribarits
  • Technical Paper
  • 2019-01-1550
To be published on 2019-06-05 by SAE International in United States
Today’s trend of downsized internal combustion engine development for cars is characterized with; high torque, low engine speed, low weight, high degree of cyclic irregularity, low excitation frequency due to fewer cylinders active e.g. 4-cylinder or less. Torque output 100 Nm at low engine speed 1000 rpm has become normal. This implies in respect of vibrations that it is important to control engine suspension rigid body modes e.g. roll yaw and pith ones. The rigid body modes frequencies should be low so they cannot be reached and induced by the low exciting harmonics of cylinder pressure and mass forces for low engine speeds or idling. Crucial is the rigid body modes in relation to the excitation forces. It is also important to control the overall flexible vibration modes. Our purpose is to describe the method to optimize the powertrain suspension, beginning with modeling/simulation and ending with verifying the vibration level on a real running engine i.e. a Volvo Cars in-line 4-cylinder VEA diesel engine in a test rig/cell. As a method a mathematical CAE model…

Design & Validation of Low-Cost Sound Intensity Probe

Michigan Technological University-Karan Gundre, Andrew Barnard
  • Technical Paper
  • 2019-01-1462
To be published on 2019-06-05 by SAE International in United States
Sound intensity measurement techniques, that used a two-microphone setup, were first developed in the late 1970s. Back then, the focus was on improving precision during testing or post-processing because the equipment available was inherently inaccurate. However, with the advent of modern, sophisticated equipment, the focus has shifted to the apparatus. Availability of phase-matched microphones has made post-test correction obsolete as the microphones eliminate a majority of the errors before the data is even collected. This accuracy, however, comes at a price, as phase-matched microphones are highly priced. This paper discusses employing the method of improving post-processing precision, using inexpensive, current equipment. The phase error of the system is corrected using a simple calibration technique and a handheld phase calibrator that is similar to the one used for amplitude calibration of microphones. The intensity probe is manufactured using rapid prototyping and the executable software that goes with the probe is designed in NI LabVIEW. The entire setup uses inexpensive parts to lower the cost and modern software to compensate for the errors due to these parts.…

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…

Developing a Custom Data Acquisition Software Package for a Self-contained Acoustic Testing Facility

Kolano and Saha Engineers Inc-Sagar Patil, Pranab Saha
Kolano and Saha Engineers Inc.-Richard Kolano
  • Technical Paper
  • 2019-01-1501
To be published on 2019-06-05 by SAE International in United States
This paper provides an overview of custom software developed for the sound generation, control and data acquisition of a self-contained acoustic testing facility system used for conducting random incidence sound absorption tests and sound transmission loss tests on small samples in accordance with SAE J2883 and J1400 standards, respectively. The paper discusses the thoughts behind developing user friendly algorithms and graphical user interfaces (GUI) for sound generation, control, data acquisition, and signal processing to obtain good data and precautions should there be any anomalies in the data.

Optimal Pressure Relief Groove Geometry for Improved NVH Performance of Variable Displacement Oil Pumps

Ford Motor Company-Abdelkrim Zouani, vidya Marri
  • Technical Paper
  • 2019-01-1548
To be published on 2019-06-05 by SAE International in United States
Variable Displacement Oil Pump (VDOP) is becoming the design of choice for engine friction reduction and fuel economy improvement. Unfortunately, this pump creates excessive pressure ripples, at the outlet port during oil pump shaft rotation, causing oscillating forces within the lubrication system and leading to the generation of objectionable tonal noises and vibrations. In order to minimize the level of noise, different vanes spacing and porting geometries are used. This paper presents an optimization method to identify the best geometry of the oil pressure relief groove. The method integrates adaptive meshing, 3D CFD simulation, Matlab routine and Genetic Algorithm based optimization. The genetic algorithm is used to create the required design space in order to perform a multi-objective optimization using a large number of parameterized groove geometries. Results of this optimization method are discussed and a design guideline for the oil pressure relief groove is disclosed.

A Non-Contact Technique for Vibration Measurement of Automotive Structures

Kettering University-Vanshaj Srivastava, Javad Baqersad
  • Technical Paper
  • 2019-01-1503
To be published on 2019-06-05 by SAE International in United States
The automotive and aerospace industries are increasingly using the light-weight material to improve the vehicle performance. However, using light-weight material can increase the airborne and structure-borne noise. A special attention needs to be paid in designing the structures and measuring their dynamics. Conventionally, the structure is excited using an impulse hammer or a mechanical shaker and the response is measured using uniaxial or multi-axial accelerometers to obtain the dynamics of the structure. However, using contact-based transducers can mass load the structure and provide data at a few discrete points. Hence, obtaining the true dynamics of the structure conventionally can be challenging. Thus, researchers and test engineers seek for non-contact measurement techniques that do not induce mass loading effects and provide full field response. In last decade, stereo-photogrammetry and three-dimensional digital image correlation have received special attention in collecting operating data for structural analysis. These non-contact optical techniques provide a wealth of distributed data over the entire structure. However, the stereo camera system is limited by its field of view of the cameras and can only…

Psychoacoustic Order Tonality Calculation

HEAD acoustics GmbH-Julian Becker, Roland Sottek
  • Technical Paper
  • 2019-01-1466
To be published on 2019-06-05 by SAE International in United States
Quantifying tonalities in technical sounds according to human perception is a task of growing importance. The psychoacoustic tonality method, published in the 15th edition of the ECMA-74 standard, is a new method that is capable of calculating the perceived tonality of a signal. Other methods, such as Prominence Ratio or Tone-to-Noise Ratio do not consider several essential psychoacoustic effects. The psychoacoustic tonality is based on a model of human hearing and thus is able to model human perception better than other methods. The algorithm described in ECMA-74 calculates tonality over time and frequency. In practice, tonalities often originate from rotating components, for example, parts of an electric motor. In these cases, quantification of the tonality of orders is often more interesting than the tonality over frequency. In this paper, an extension of the psychoacoustic tonality according to ECMA-74 is presented. With this extension, it is possible to calculate the order tonalities by using the rotational speed characteristics of the measured signal in order to control the parameters of the auditory filter bank. Two of the…