Turbocharger Nonlinear Response With Engine-Induced Excitations: Predictions and Test Data

2009 ◽  
Vol 132 (3) ◽  
Author(s):  
Luis San Andrés ◽  
Ash Maruyama ◽  
Kostandin Gjika ◽  
Sherry Xia
Keyword(s):  
Test Data ◽  
High Speed ◽  
Engine Speed ◽  
Behavior Modeling ◽  
Lubricant Films ◽  
Speed Range ◽  
Bearing Design ◽  
Power Outputs ◽  
Main Engine ◽  
Good Agreement

Turbochargers (TCs) aid to produce smaller and more fuel-efficient passenger vehicle engines with power outputs comparable to those of large displacement engines. This paper presents further progress on the nonlinear dynamic behavior modeling of rotor-radial bearing system by including engine-induced (TC casing) excitations. The application is concerned with a semifloating bearing design commonly used in high speed turbochargers. Predictions from the model are validated against test data collected in an engine-mounted TC unit operating at a top speed of 160 krpm (engine speed=3600 rpm). The bearing model includes noncylindrical lubricant films as in a semifloating-ring bearing with an antirotation button. The nonlinear rotor transient response model presently includes input base motions for the measured TC casing accelerations for increasing engine load conditions. Engines induce TC casing accelerations rich in multiple harmonic frequencies; amplitudes being significant at two and four times the main engine speed. Fast Fourier transfor frequency domain postprocessing of predicted nonlinear TC shaft motions reveals a subsynchronous whirl frequency content in good agreement with test data, in particular, for operation at the highest engine speeds. Predicted total shaft motion is also in good agreement with test data for all engine loads and over the operating TC shaft speed range. The comparisons validate the rotor-bearing model and will aid in reducing product development time and expenditures.

Turbocharger Nonlinear Response With Engine-Induced Excitations: Predictions and Test Data

2009 ◽  
Author(s):  
Luis San Andre´s ◽  
Ash Maruyama ◽  
Kostandin Gjika ◽  
Sherry Xia
Keyword(s):  
Test Data ◽  
High Speed ◽  
Engine Speed ◽  
Behavior Modeling ◽  
Lubricant Films ◽  
Speed Range ◽  
Bearing Design ◽  
Power Outputs ◽  
Main Engine ◽  
Good Agreement

Turbochargers (TCs) aid to produce smaller and more fuel-efficient passenger vehicle engines with power outputs comparable to those of large displacement engines. This paper presents further progress on the nonlinear dynamic behavior modeling of rotor-radial bearing system (RBS) by including engine-induced (TC casing) excitations. The application concerns to a semi-floating bearing design commonly used in high speed turbochargers. Predictions from the model are validated against test data collected in an engine-mounted TC unit operating to a top speed of 160 krpm (engine speed = 3600 rpm). The bearing model includes non-cylindrical lubricant films as in a semi-floating ring bearing with an anti-rotation button. The nonlinear rotor transient response model presently includes input base motions for the measured TC casing accelerations for increasing engine load conditions. Engines induce TC casing accelerations rich in multiple harmonic frequencies; amplitudes being significant at 2 and 4 times the main engine speed. FFT post-processing of predicted nonlinear TC shaft motions reveals a subsynchronous whirl frequency content in good agreement with test data, in particular for operation at the highest engine speeds. Predicted total shaft motion is also in good agreement with test data for all engine loads and over the operating TC shaft speed range. The comparisons validate the rotor-bearing model and will aid in reducing product development time and expenditures.

scholarly journals HSM Spindle Model Updating With Physical Phenomena Refinements

2013 ◽  
Author(s):  
David Noel ◽  
Sebastien Le Loch ◽  
Mathieu Ritou ◽  
Benoit Furet
Keyword(s):  
Dynamic Behavior ◽  
High Speed ◽  
Model Updating ◽  
Research Work ◽  
Behavior Modeling ◽  
Specific Device ◽  
Sensibility Analysis ◽  
Physical Phenomena ◽  
Good Agreement ◽  
Do So

The modeling of High Speed Machining (HSM) spindles is a complex task due to the numerous physical phenomena involved in the dynamic behavior. Modeling is still rarely used in the industry, although sophisticated research work has been achieved. The boundary conditions of rotor models, which correspond to the ball bearings, are crucial and difficult to define. Indeed, they affect the dynamic behavior of the rotor in a non-linear and sometimes in an unpredictable way. The aim of the paper is to determine a relevant spindle model, i.e. the adequate level of complexity. To do so, a dynamic bearing model is introduced and the axial model of a spindle is established in relation to the preloaded bearing arrangement. Then, the operating stiffness of the spindle has been obtained experimentally with a new specific device that applies axial load and measures the resulting displacement, whatever the spindle speed. The model updating with the experimental data combined to sensibility analysis have led to the model refinement with additional physical phenomena, in order to account for non-linearities observed experimentally. The parameters of the model are also identified experimentally. As a result, a relevant spindle model is obtained and validated by the good agreement between simulations and experiments.

scholarly journals PENGGUNAAN DAYA MESIN PENGGERAK KAPAL PUKAT CINCIN KM. MAESTRO

2013 ◽  
Vol 9 (2) ◽  
pp. 50
Author(s):  
Revols DCh Pamikiran
Keyword(s):  
High Speed ◽  
Engine Speed ◽  
Equation Model ◽  
North Sulawesi ◽  
Effectiveness And Efficiency ◽  
Main Engine ◽  
The Relationship ◽  
Propulsion Power ◽  
Ship Speed ◽  
Horse Power

Salah satu faktor yang mempengaruhi efektivitas dan efisiensi adalah penggunaan tenaga mesin (HP) dalam kegiatan penangkapan ikan. Tujuan dari penelitian ini adalah untuk mengetahui hubungan antara mesin utama (HP) dan kecepatan kapal (v), mengestimasi kekuatan pendorong berdasarkan ukuran dan kecepatan kapal, serta menentukan kategori berdasarkan kecepatan kapal.  Penelitian terhadap kapal motor (KM) Maestro purse seine di Desa Kema III, Kabupaten Minahasa Utara, Sulawesi Utara memperlihatkan bahwa hubungan antara tenaga mesin (HP) dan kecepatan kapal (knot) mengikuti model persamaan matematis sebagai berikut: v (knot) = 13,05-6322 * exp (-0,000117 * (HP) ^ 1.715). dan (2). Hasil estimasi di lapangan menunjukkan bahwa kecepatan kapal (knot) berdasarkan jumlah putaran mesin (rpm) dan tenaga mesin (HP) yang mengkategorikan kapal kecepatan tinggi. Kata kunci: mesin, horse power, kecepatan, kapal pukat cincin.   One of the factors that influence the effectiveness and efficiency of fishing activities is the use of power of the engine (HP) in fishing activities. The purpose of this study was to determine the relationship between the main engine (HP) and speed of the vessel (v), and to estimate of propulsion power based on size and speed of the ship, as well as to identify the category based on her speed. The study on the Maestro purse seiner in Kema III village, North Minahasa regency, North Sulawesi, showed that the elationship between the power engine (HP) and speed of the ship (knots) followed a mathematical equation model: v (knots) = 13.05-6322 * exp (-0.000117 * (HP) ^ 1,715), and (2). The estimation in the field showed that ship speed (knots), based on the amount of the engine speed (rpm) and power engine (HP), could be categorized as high speed. Keywords: engine, horse power (HP), speed, purse-seiner.

scholarly journals Experimental Analysis to find the optimum Specific Fuel Consumption for Driver’s Intimation

2019 ◽  
Vol 8 (2) ◽  
pp. 452-456
Keyword(s):  
Fuel Consumption ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Engine Speed ◽  
Light Emitting Diode ◽  
Specific Fuel Consumption ◽  
Fuel Price ◽  
Light Emitting ◽  
Speed Range ◽  
Range Indicator

The crude oil based fuel price is constantly increasing in India, So it is compulsory to utilize the fuel properly by the user. As most of the driver tends to press the gas pedal unnecessarily, the fuel used at that particular condition is excess than the requirement. This experiment focuses on improving the fuel economy by warning the driver to drive their vehicles in optimum Specific Fuel Consumption (SFC) range using electronic SFC Speed Range Indicator. In variable speed Internal Combustion Engines there will be an optimum SFC range for a particular load and Engine Speed. Our system will monitor the Engine speed and load continuously and also compare the values with best SFC speed range graph and depends on these values the three Light Emitting Diode (LED) on Specific Fuel Consumption Speed Range Indicator(SFCSRI) will glow accordingly to mention the driver about the optimum, low or high speed. This helps the driver to drive their vehicles on optimum SFC range

Piston Friction Force of a Small High Speed Gasoline Engine

1988 ◽  
Vol 110 (1) ◽  
pp. 112-118 ◽  
Author(s):  
M. Takiguchi ◽  
K. Machida ◽  
S. Furuhama
Keyword(s):  
Friction Force ◽  
High Speed ◽  
Engine Speed ◽  
Gasoline Engine ◽  
Measuring Instruments ◽  
Friction Forces ◽  
Engine Speed Range ◽  
Speed Range ◽  
High Engine Speed

This paper clarified piston friction forces and conditions of lubrication in the high engine speed range through the improvement of piston friction measuring instruments. Measurements of piston friction forces of the two-ring package have been also done. It is found that the effect of the two-ring package on the reduction of friction forces is greater than expected by means of the oil starvation phenomenon.

Modeling of Tread Block Contact Mechanics Using Linear Viscoelastic Theory3

2008 ◽  
Vol 36 (3) ◽  
pp. 211-226 ◽  
Author(s):  
F. Liu ◽  
M. P. F. Sutcliffe ◽  
W. R. Graham
Keyword(s):  
High Speed ◽  
Slip Rate ◽  
Material Model ◽  
Contact Forces ◽  
Block Modeling ◽  
Rate Dependent ◽  
Linear Viscoelastic Material ◽  
Linear Viscoelastic ◽  
The Impact ◽  
Good Agreement

Abstract In an effort to understand the dynamic hub forces on road vehicles, an advanced free-rolling tire-model is being developed in which the tread blocks and tire belt are modeled separately. This paper presents the interim results for the tread block modeling. The finite element code ABAQUS/Explicit is used to predict the contact forces on the tread blocks based on a linear viscoelastic material model. Special attention is paid to investigating the forces on the tread blocks during the impact and release motions. A pressure and slip-rate-dependent frictional law is applied in the analysis. A simplified numerical model is also proposed where the tread blocks are discretized into linear viscoelastic spring elements. The results from both models are validated via experiments in a high-speed rolling test rig and found to be in good agreement.

Joint High Speed Sealift (JHSS) Segmented Model Test Data Analysis and Validation of Numerical Simulations

2012 ◽  
Author(s):  
Dominic Piro ◽  
Kyle A. Brucker ◽  
Thomas T. O'Shea ◽  
Donald Wyatt ◽  
Douglas Dommermuth ◽  
...  
Keyword(s):  
Data Analysis ◽  
Numerical Simulations ◽  
Test Data ◽  
Model Test ◽  
High Speed ◽  
Segmented Model

Dynamic model for high-speed rotors based on their experimental characterization

2017 ◽  
Vol 2 (4) ◽  
pp. 25
Author(s):  
L. A. Montoya ◽  
E. E. Rodríguez ◽  
H. J. Zúñiga ◽  
I. Mejía
Keyword(s):  
Dynamic Model ◽  
High Speed ◽  
Natural Frequencies ◽  
Mode Shapes ◽  
Experimental Characterization ◽  
Rotating Systems ◽  
Computing Performance ◽  
The Impact ◽  
Stiffness Distribution ◽  
Good Agreement

Rotating systems components such as rotors, have dynamic characteristics that are of great importance to understand because they may cause failure of turbomachinery. Therefore, it is required to study a dynamic model to predict some vibration characteristics, in this case, the natural frequencies and mode shapes (both of free vibration) of a centrifugal compressor shaft. The peculiarity of the dynamic model proposed is that using frequency and displacements values obtained experimentally, it is possible to calculate the mass and stiffness distribution of the shaft, and then use these values to estimate the theoretical modal parameters. The natural frequencies and mode shapes of the shaft were obtained with experimental modal analysis by using the impact test. The results predicted by the model are in good agreement with the experimental test. The model is also flexible with other geometries and has a great time and computing performance, which can be evaluated with respect to other commercial software in the future.

scholarly journals High-enthalpy hypersonic flows

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Joseph J. S. Shang ◽  
Hong Yan
Keyword(s):  
Hypersonic Flow ◽  
High Speed ◽  
Quantum Physics ◽  
Nonequilibrium Thermodynamic ◽  
Strong Shock ◽  
Hypersonic Flows ◽  
Electrically Conducting ◽  
High Enthalpy ◽  
Speed Range ◽  
Flow Theories

Abstract Nearly all illuminating classic hypersonic flow theories address aerodynamic phenomena as a perfect gas in the high-speed range and at the upper limit of continuum gas domain. The hypersonic flow is quantitatively defined by the Mach number independent principle, which is derived from the asymptotes of the Rankine-Hugoniot relationship. However, most hypersonic flows encounter strong shock-wave compressions resulting in a high enthalpy gas environment that always associates with nonequilibrium thermodynamic and quantum chemical-physics phenomena. Under this circumstance, the theoretic linkage between the microscopic particle dynamics and macroscopic thermodynamics properties of gas is lost. When the air mixture is ionized to become an electrically conducting medium, the governing physics now ventures into the regimes of quantum physics and electromagnetics. Therefore, the hypersonic flows are no longer a pure aerodynamics subject but a multidisciplinary science. In order to better understand the realistic hypersonic flows, all pertaining disciplines such as the nonequilibrium chemical kinetics, quantum physics, radiative heat transfer, and electromagnetics need to bring forth.

Effect of Pressure on Bubble Growth Within Liquid Droplets at the Superheat Limit

1982 ◽  
Vol 104 (4) ◽  
pp. 750-757 ◽  
Author(s):  
C. T. Avedisian
Keyword(s):  
Vapor Bubble ◽  
Bubble Growth ◽  
High Speed ◽  
Ambient Pressure ◽  
Organic Liquid ◽  
Liquid Droplets ◽  
Growth Data ◽  
Two Phase ◽  
Photographic Evidence ◽  
Good Agreement

A study of high-pressure bubble growth within liquid droplets heated to their limits of superheat is reported. Droplets of an organic liquid (n-octane) were heated in an immiscible nonvolatile field liquid (glycerine) until they began to boil. High-speed cine photography was used for recording the qualitative aspects of boiling intensity and for obtaining some basic bubble growth data which have not been previously reported. The intensity of droplet boiling was found to be strongly dependent on ambient pressure. At atmospheric pressure the droplets boiled in a comparatively violent manner. At higher pressures photographic evidence revealed a two-phase droplet configuration consisting of an expanding vapor bubble beneath which was suspended a pool of the vaporizing liquid. A qualitative theory for growth of the two-phase droplet was based on assuming that heat for vaporizing the volatile liquid was transferred across a thin thermal boundary layer surrounding the vapor bubble. Measured droplet radii were found to be in relatively good agreement with predicted radii.

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