Parametric design optimization of e-compressor NVH using blocked forces and substructuring

Haeussler, M.; Kobus, D.C.; Rixen, Daniel J.

doi:10.1016/j.ymssp.2020.107217

Cited by 13 publications

(7 citation statements)

References 21 publications

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“…The sound pressure fluctuations radiated by the compressor increase linearly with speed, this corresponds to findings of Haeussler et al [8]. Increasing high pressure and increasing compression ratio result in a small increment of the sound radiation.…”

Section: Airborne Soundsupporting

confidence: 88%

“…Lee et al [6] and Miao et al [7] showed that the airborne sound radiation correlates with the vibrations of the compressor and that vibrational resonances of the casing can lead to a strong increase of the radiated airborne sound. In the investigations of Haeussler et al [8], sound radiation of an electric scroll compressor is proportional to the rotation speed. Yanagisawa et al [9] were able to establish a connection between the suction pressure and the sound radiation, as well as to prove the excitation of vibration resonances of the compressor shaft by high pressure pulsations.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Thermodynamic Process Parameters on the Acoustic Properties of Electric Refrigerant Scroll Compressors

Saur,

Becker

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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With the ongoing electrification of vehicles, the acoustic properties of the vehicle's interior are increasingly affected by auxiliary units. In electric vehicles, the battery and the electric motors must be cooled in addition to the passenger cell. Therefore, larger A/C compressors are needed, which increase sound radiation and vibration excitation. The compressor is the central sound source in the refrigeration circuit, on the one hand through direct airborne sound radiation, on the other hand it causes acoustic excitation of other refrigeration circuit components via pressure pulsations and vibration transmission. To characterize the acoustic properties of refrigerant scroll compressors, a test rig was developed that allows an isolated observation of the acoustic properties of refrigerant compressors in an anechoic chamber. This paper investigates the influence of thermodynamic process variables on compressor acoustics and shows that increasing speed and compression ratio lead to greater sound radiation. The sound spectra of fluid, structure and airborne noise are dominated by speed-dependent, tonal components. The findings provide insights into the physical relationship between thermodynamic and acoustic parameters and enable the identification of a low noise operating range.

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Section: Airborne Soundsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Influence of Thermodynamic Process Parameters on the Acoustic Properties of Electric Refrigerant Scroll Compressors

Saur,

Becker

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

View full text Add to dashboard Cite

show abstract

“…In the automotive industry, especially for efficiency reasons, the most widely used compressor the scroll type [2], which features reduced vibrations in the gas compression phase. The dynamic behavior of the complete system, however, depends on the positioning of the component within the car and on the chosen isolation strategy, and only recently has become an addressable issue [3], [4], [5].Typical operating conditions for this component occur at low frequencies (10÷150 Hz), where it can be modeled as a rigid body. In these conditions, the internal forces and the forces due to the displacement of the body are transferred to the vehicle's chassis through the mounting elements.…”

Section: Introductionmentioning

confidence: 99%

On the Different Contributions of Flexible Elements to the Structural Noise of Refrigeration Compressors

Ricci¹,

Bregant²,

Albertz³

2022

SAE Technical Paper Series

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Air conditioning acoustics have become of paramount importance in electric vehicles, where noise from electromechanical components is no longer masked by the presence of the internal combustion engine. In a car HVAC systems, the coolant compressor is one of the most important sources in terms of vibration and noise generation. The paper, the generated structural noise is studied in detail on a prototype installation, and the noise transmission and propagation mechanisms are analyzed and discussed. Through "in situ" measurements and virtual point transformation, the rotor unbalance forces and torque acting within the component are identified. The dynamic properties of the rubber mounts, installed between the compressor and its support, are identified thanks to matrix inversion methods. To assess the quality of the proposed procedure, the synthesized sound pressure level is compared with experimental SPL measurements in different operational conditions. The contributions to the structure borne noise of the installed hoses and mounts are evaluated, ranked and commented.

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“…A transfer path analysis (TPA) technique can be used to study the energy flow between system components, the low-frequency response, and determine the dominant components that control the system response [26]. Most of the TPA studies on vehicle systems were focused on high-frequency vibration as discussed in [27][28][29][30]. In terms of driveability, Jimbo et al [31] used an experimental TPA technique to analyse the behaviour of the vehicle during acceleration.…”

Section: Introductionmentioning

confidence: 99%

Model-based Energy Path Analysis of Tip-in Maneuvers in a 2WD Vehicle with Range-extender Electric Powertrain Architecture

Shah¹,

Jones²,

Cheng³

et al. 2021

Preprint

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Vehicle driveability is one of the important vehicle attributes in range-extender electric vehicles due to the electric motor torque characteristics at low-speed events. The process of validating and rectifying vehicle driveability attributes is typically utilised by a physical vehicle prototype that can be expensive and required several design iterations. In this paper, a model-based energy method to assess vehicle driveability is presented based on a high-fidelity 49 degree-of-freedom powertrain and vehicle systems. Multibody dynamics components were built according to their true centre of gravity relative to the vehicle datum for providing an accurate system interaction. The work covered a frequency at less than 20 Hz. The results that consisted of the component frequency domination are structured and examined to identify the low-frequency sensitivity based on different operating parameters such as a road surface coefficient. An energy path technique was also implemented on the dominant component by decoupling its compliances to study the effect on the vehicle driveability and low-frequency response. The outcomes of the research provided a good understanding of the interaction across the sub-systems levels. The powertrain rubber mounts were the dominant components that controlled the low-frequency contents (< 15.33 Hz) and can change the vehicle driveability quality.

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Parametric design optimization of e-compressor NVH using blocked forces and substructuring

Cited by 13 publications

References 21 publications

Influence of Thermodynamic Process Parameters on the Acoustic Properties of Electric Refrigerant Scroll Compressors

Influence of Thermodynamic Process Parameters on the Acoustic Properties of Electric Refrigerant Scroll Compressors

On the Different Contributions of Flexible Elements to the Structural Noise of Refrigeration Compressors

Model-based Energy Path Analysis of Tip-in Maneuvers in a 2WD Vehicle with Range-extender Electric Powertrain Architecture

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