Experimental study of sloshing noise in a partially filled rectangular tank under periodic excitation

2018 ◽  
Vol 233 (11) ◽  
pp. 2891-2902
Author(s):  
Siva Teja Golla ◽  
K Mayur ◽  
B Venkatesham ◽  
R Banerjee
Keyword(s):  
Experimental Study ◽  
Dynamic Response ◽  
High Speed ◽  
Resonance Condition ◽  
Fluid Motion ◽  
Noise Generation ◽  
Periodic Excitation ◽  
Rectangular Tank ◽  
Generation Mechanisms ◽  
Fill Level

Liquid sloshing is becoming a major source of noise in hybrid and high-end luxury cars, especially during acceleration/deceleration driving conditions. This is due to the reduction in noise from other sources, namely, engine, transmission system, road–tyre interaction and so on. Sloshing noise is highly dependent on fluid motion in the containers. Based on the fluid motion in the containers, sloshing is classified into different regimes. The present experimental study discusses the noise generation mechanisms for various sloshing regimes. It is done by emulating different sloshing regimes in a partially filled rectangular tank by imposing longitudinal periodic excitation. The effect of fill level on noise generation phenomenon in each regime is analysed, individually, using dynamic response parameters and high-speed camera images. In this study, the measured dynamic response parameters are pressure, force, acceleration and sound pressure levels as a function of time. The fundamental reasons for the cause of sloshing noise in partially filled rectangular tanks are identified in terms of fluid motion and its interaction with the surrounding objects. The excitations upto the sloshing resonance condition cause hydraulic jumps along the tank walls leading to hit noise. Excitations beyond the sloshing natural frequency cause the predominant interaction of surface waves with surrounding fluid leading to splash noise.

Lärmuntersuchung an PKD-Planfräsern im Leerlauf/Noise on fast rotating face milling cutter in tool running idle

2021 ◽  
Vol 111 (05) ◽  
pp. 349-354
Author(s):  
Alexander Dobrinski ◽  
Thomas Stehle ◽  
Hans-Christian Möhring
Keyword(s):  
High Speed ◽  
Face Milling ◽  
Noise Generation ◽  
German Research Foundation ◽  
High Speed Cutting ◽  
Sound Exposure ◽  
Machine Operators ◽  
Generation Mechanisms ◽  
The University ◽  
Fast Rotating

Die Lärmentstehungsproblematik bei der HSC (High Speed Cutting)-Fräsbearbeitung von Leichtbaumaterialien wie Aluminiumlegierungen und Kunststoffen ist aufgrund der hohen auf Maschinenbediener wirkenden Schallexpositionswerten sehr aktuell. Am Institut für Werkzeugmaschinen (IfW) der Universität Stuttgart wurden Untersuchungen zur Ermittlung der Lärmentstehungsmechanismen im Leerlauf sowie der daraus folgenden Ableitung von Lärmminderungsmaßnahmen an schnell rotierenden Planfräswerkzeugen im Rahmen des von der Deutschen Forschungsgemeinschaft (DFG) geförderten Forschungsprojektes STE 1563/28-1 durchgeführt.   The problem of noise generation during HSC milling of lightweight materials such as aluminium alloys and plastics is highly relevant due to the high levels of sound exposure affecting machine operators. The Institute for Machine Tools at the University of Stuttgart conducted investigations to determine the noise generation mechanisms during tool idling and to derive noise reduction measures on fast rotating face milling tools as part of the research project STE 1563/28-1 funded by the German Research Foundation (DFG).

The Effect of Strain Rate on the Material Characteristics of Nickel-Based Superalloy Inconel 718

2007 ◽  
Vol 340-341 ◽  
pp. 283-288 ◽  
Author(s):  
Jung Han Song ◽  
Hoon Huh
Keyword(s):  
Dynamic Response ◽  
High Strain Rate ◽  
Strain Rate ◽  
Turbine Blade ◽  
Inconel 718 ◽  
High Speed ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Experimental Results ◽  
Stress Wave Propagation

The dynamic response of the turbine blade materials is indispensable for analysis of erosions of turbine blades as a result of impulsive loading associated with gas flow. This paper is concerned with the dynamic material properties of the Inconel 718 alloy which is widely used in the high speed turbine blade. The dynamic response at the corresponding level of the strain rate should be acquired with an adequate experimental technique and apparatus due to the inertia effect and the stress wave propagation. In this paper, the dynamic response of the Inconel 718 at the intermediate strain rate ranged from 1/s to 400/s is obtained from the high speed tensile test and that at the high strain rate above 1000/s is obtained from the split Hopkinson pressure bar test. The effects of the strain rate on the dynamic flow stress, the strain rate sensitivity and the failure elongation are evaluated with the experimental results. Experimental results from both the quasi-static and the high strain rate up to 3000/s are interpolated in order to construct the constitutive relation that should be applied to simulate the dynamic behavior of the turbine blade made of the Inconel 718.

Experimental study on laminated glass responses of high-speed trains subject to windblown sand particles loading

2021 ◽  
Vol 300 ◽  
pp. 124332
Author(s):  
Gongxun Deng ◽  
Wen Ma ◽  
Yong Peng ◽  
Shiming Wang ◽  
Song Yao ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Laminated Glass ◽  
Windblown Sand ◽  
High Speed Trains ◽  
Sand Particles

Experimental study on the dynamic response of a water ballast type floating breakwater

2021 ◽  
Vol 233 ◽  
pp. 109012
Author(s):  
Zhiwen Yang ◽  
Xinran Ji ◽  
Mingxiao Xie ◽  
Jinzhao Li ◽  
Huaqing Zhang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Dynamic Response ◽  
Floating Breakwater

Running safety evaluation of a 350 km/h high-speed freight train negotiating a curve based on the arbitrary Lagrangian-Eulerian method

2021 ◽  
pp. 095440972098628
Author(s):  
Gongxun Deng ◽  
Yong Peng ◽  
Chunguang Yan ◽  
Boge Wen
Keyword(s):  
High Speed ◽  
Safety Evaluation ◽  
Interaction Model ◽  
Arbitrary Lagrangian Eulerian ◽  
Railway Transportation ◽  
Freight Train ◽  
Fluid Structure ◽  
Running Safety ◽  
Study Results ◽  
Fill Level

To adapt to the rapid growth of the logistics market and further improve the competitiveness of railway transportation, the high-speed freight train with a design speed of 350 km/h is being developed in China. The safety of the train under great axle load of 17 t and dynamic load is unknown. This paper is aimed to study the running safety of the high-speed freight train coupled with various cargo loading conditions negotiating a sharp curve at high velocity. A numerical model integrated a fluid-structure coupled container model and the nonlinear high-speed freight train was set up by the software of LS-DYNA. The fluid-structure interaction model between the container and fluid cargo was established using the Arbitrary Lagrangian-Eulerian (ALE) method. Two influencing parameters, including the cargo state in the container and the fill level, were selected. The study results showed that the wheelset unloading ratio and overturning coefficient could be significantly affected by the liquid sloshing, while the influence of sloshing on the risk of derailment was slight. In general, increasing the cargo filling rate would contribute to vehicle operation safety. In conclusion, this study would provide theoretical help for the running safety of the newly designed high-speed freight train.

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