內(nèi)容講義課件成果nvh

1、EXCITE Piston & Rings活塞動力學(xué)與敲擊噪聲3D Piston Slap NVHAVL-AST NVH Workshop22 May, ShanghaiAVL-AST NVH Seminar, 22, 23 May, ShanghaiPage 1Thrust SidePiston Forces 34 deg FTDCPiston DeformationAVL EXCITE PR主要功能 活塞和受力分析活塞缸套敲擊分析摩擦損失活塞環(huán)環(huán)間受力分析密封和竄氣機(jī)油消耗Page 2AVL-AST NVH Seminar, 22, 23 May, Shanghai活塞動力學(xué) Pi

2、ston Dynamics 發(fā)動 整機(jī) 活塞 缸套 活塞 活塞 活塞 等活塞敲擊的主要影響因素機(jī)強(qiáng)化程度：最大爆壓、最高轉(zhuǎn)速等：沖程、連桿長度、缸套長度等型線（考慮冷機(jī)和熱機(jī)狀態(tài)） 變形質(zhì)量、質(zhì)心，活塞徑向剛度等結(jié)構(gòu)參數(shù)缸套間隙銷孔偏移AVL-AST NVH Seminar, 22, 23 May, ShanghaiPage 3EXCITE PR 建模與前后處理界面 Easy-to-Use GUIModular SystemFlexible General Post- Processor (Animation)AVL-AST NVH Seminar, 22, 23 May, ShanghaiP

3、age 4EXCITE PR 計(jì)算數(shù)據(jù)流Liner Profile Piston Profile 型面Piston Slap 活塞動力學(xué)Piston Stiffness 剛度Piston and Liner Forces (NVH)Contact ProblemImpact Energy 敲擊動能DynamicContact Pressure 接觸壓力Engine Data 發(fā)動機(jī)數(shù)據(jù)Piston Friction 活塞缸套摩擦Speed, Load,Combustion Pressure (gas force eccentricity)Lateral MotionTilting Motion

4、Piston Ring DynamicsGeneral Ring Data 環(huán)數(shù)據(jù)活塞環(huán)組動力學(xué)Surfacesat Ring and Groove 幾何表面Gas DynamicBlow By 竄氣量Ring DynamicRing Friction 環(huán)組摩擦Oil Film ThicknessHydrodynamicInterring PressureRing Axial MotionLube Oil Data 滑油數(shù)據(jù)Lube Oil ConsumptionViscosity 粘度潤滑油消耗Gas Constant, DiffusionCoefficient, Partial Press

5、ure滑油氣態(tài)熱力學(xué)參數(shù)Oil Throw - OffEvaporationCombustion Gas Temp.Heat Transmission Coeff.Oil Scraat ToplandSwirl of the ChargeReverse Oil BlowAVL-AST NVH 缸Sem內(nèi)in熱ar,力22,學(xué)23數(shù)Ma據(jù)y, ShanghaiPage 5Temp. at Piston, Rings and Liner溫度分布活塞動力學(xué)Piston Dynamics活塞和受力分析接觸區(qū)網(wǎng)格分辨率Grid Resolutionof contacting Areas節(jié)點(diǎn)數(shù)據(jù)Node

6、fileAij Bij.stiffnessAVL-AST NVH Seminar, 22, 23 May, ShanghaiPage 62) 活塞徑向剛度3D內(nèi)插Interpolation1) 定義輪廓3)3D內(nèi)插Interpolation活塞冷熱態(tài)型面Piston and Liner Profile FE Calculation of Piston andLiner thermal Deformation Empirical MethodTemperature from Measurement orestimatedEvaluation according:AVL-AST

7、 NVH Seminar, 22, 23 May, ShanghaiPage 7Dri = ai DTia.thermal exp ansion coefficient活塞體剛度試驗(yàn)Piston Stiffness - 3D Approach Required Piston Deformation DataN * N . Medium LoadN * N . High Load2 * N * N FE CalculationMbetween Clam Measurement with small ClamClawAVPage 86N17ClamClawL-AST NVH Seminar, 22

8、, 23 May, Shanghai活塞體剛度有限元計(jì)算Piston Stiffness from FE static analysisLoading§ all N nodes loaded separately withconstant force in radial directionStatic Force(e.g. F=1000N)§ define load sets (for each force on each node create a single load set = N loadsets)AVL-AST NVH Seminar, 22, 23 May,

9、ShanghaiPage 9活塞敲擊噪聲Piston Slap Induced NoiseAVL-AST NVH Seminar, 22, 23 May, ShanghaiPage 10FL 1LinerFL 2Fp4FL 3PistonFp3FL 4Fp2FL 5Width of Load Parabola (lw)FL 6Fp1載荷拋物線Load ParabolaFL i . Liner Side Forces缸套側(cè)受力Fpi. Piston Side Forces活塞側(cè)受力( calculated with GLIDE )活塞敲擊噪聲Piston Slap Induced Noise缸套

10、所受激勵力Excitation Forces at Cylinder LinerFTDCBDCSTDCBDCFTDCBDC STDC BDC(2 Liter Gasoline Engine汽油機(jī)).推力側(cè) Thrust Side反推力側(cè). 活塞銷中心氣缸方向運(yùn)動Axial Piston Motion ofPiston Pin Centre.缸套有限元節(jié)點(diǎn)Liner FE-Nodes-9090270450630-9090270450630Crank Angle (deg)Crank Angle (deg)AVL-AST NVH Seminar, 22, 23 May, ShanghaiPage

11、11Force (kN)0.03.0Thrust SidePiston Slap Induced NoiseAVL-AST NVH Seminar, 22, 23 May, ShanghaiPage 12Air borne noise (SYSNOISE)FE-ProgramData recovery to the Entire (unreduced) FE-StructurePostprocessing2D: Fringe Plots with Velocity Levels, Bearing Forces, Orbital Paths, etc.3D + Animation, Acoust

12、ic Post-proc.ASCII TablesDynamic Components at reduced DoFNonlinear Forced Vibration Analysis of all Moving Structure Parts including Nonlinear JointsLOAD Preprocessing ASCII TablesGeometry, Table of DoF, Reduced Structural MatricesExternal LoadsGas Force, Piston Impact, Forces, Output Torque, FIEDr

13、iveLoadsFE-ProgramFE-Ms (Block, Crankshaft, Conrod, Gear Box) Static and Dynamic Reduction活塞敲擊載荷施加EXCITE PU模型上 Gas Forces(Measured or Calculated with BOOST) Valve Train Forces(Calculated with AVL EXCITE Drive) Piston Impact Forces(Calculated with AVL EXCITE Piston & Rings) Output Torque(Measured

14、 or Calculated) Fuel Injection System, etc.AVL-AST NVH Seminar, 22, 23 May, ShanghaiPage 13Moment (Nm)Force (kN)Force (kN)-3 -202Pressure (bar)100125150-15 -808 1530204060Cyl. #1Cyl. #2Cyl. #3Cyl. #4Camshaft Bearing #1 - YCamshaft Bearing #1 - ZThrust SideForces over Cylinder Liner Height0123Engine

15、Cycle (-)thrust Side4 Cylinder Diesel Engine 5000 rpm, Full LoadIntegral Velocity Levels 8th Octave (2 kHz)dBGas Force + Piston Slap+ Valve Train ForcesGas ForceAVL-AST NVH Seminar, 22, 23 May, ShanghaiPage 14不同激勵源的影響 Acoustic Analysis活塞敲擊噪聲EXCITE PR-PU 計(jì)算缸套振動加速度級頻率加速度曲柄轉(zhuǎn)角AVL-AST NVH Seminar, 22, 23

16、 May, ShanghaiPage 15活塞敲擊噪聲的不同參數(shù)影響活塞敲擊Piston Slap Excitation活塞質(zhì)心、活塞缸套間隙、活塞銷孔偏移等不同參數(shù)的影響Variation of differentdesign parameters for noise optimization沖擊能量AVL-AST NVH Seminar, 22, 23 May, ShanghaiPage 16不同型線的影響AVL-AST NVH Seminar, 22, 23 May, ShanghaiPage 17活塞銷偏心量的影響AVL-AST NVH Seminar, 22, 23 May, Sha

17、nghaiPage 18活塞銷偏置的效果Effect on Piston Pin Offset to Thrust SideAVL-AST NVH Seminar, 22, 23 May, ShanghaiPage 19Kinetic Energy (Nm)Tilting around Pin (deg)Pin Displacement (mm)0.080.060.040.020-0.02-0.04-0.06-0.08-900901802703604505406300-0.1-0.2-0.3-900901802703604505406300.060.040.020-90090

18、180270360450540630Crank Angle (deg)no Offset0.5mm Offset1mm Offset活塞敲擊噪聲活塞運(yùn)動結(jié)果：活塞/缸套接觸力AVL-AST NVH Seminar, 22, 23 May, ShanghaiPage 20引燃噴射的影響Effect of Pilot InjectionPassenger Car Diesel Engine, 2000 rpm / 2 barAVL-AST NVH Seminar, 22, 23 May, ShanghaiATSTSCombustion Pressure (bar)ATSPin Displacement (mm)TSKinetic Energy (Nm)