The Proceedings of the Dynamics & Design Conference, 2003
High・ speed diese 置 engines for motor vehicles and constmction machineries are required sound red... more High・ speed diese 置 engines for motor vehicles and constmction machineries are required sound reduction and good sound quality aleng with high performance and clean exhaust gas emission ． In order to produce the good engine so し md ， it is important that engineers estimate the engine sound and evaluate it in the ear 且 y design phase ， This paper presents a theoretical approach to estimate the time history of engine sound and an evaluation approach ofengine sound qua 疑ty using wavelet transfbmm．
Transactions of the Japan Society of Mechanical Engineers Series C, 2010
This paper presents the theoretical method to pred孟 ct the prQpagation of struct ロ re − b〔，rne sG... more This paper presents the theoretical method to pred孟 ct the prQpagation of struct ロ re − b〔，rne sGund of fiuid − Jeaded structure by using Statistical Energy Analysis (SEA) ． The effects of fiuid on sound transmission are considered as the change of mode llulnber and the increase of internal bss factof of 且uid − loaded elements in the speci 且 ed frequency range of SEA model ． The complex ・ valued added rnass ｛ s use 〔艮to describe the fiuid loaded effect and 丗 e sound pressure propagation to the adlacent plate in the nuid is eva ］ ua 亡 ed as the change of transmission coef 丑cient at L and X ． ・ type junct ｛ on consistirlg of fiuid − 10aded plates ． These analyticul procedures are applied to deterlnine the vibration energy transmission 呈 n the plate struc ヒ ure con 仁 aining the water tank The calculated results agrees well with the Incasured one and the avai 置 ability of this method is confirmed ． Key 四 〇 lylS ： Sound and Acoustic ， Vibrati 〔 〕n Coupled with Fluid Motion ， Noise Control ， Structure Borne S〔川 nd ， SEA
This paper presents the theoretical procedure to predict the vibratory response and radiated nois... more This paper presents the theoretical procedure to predict the vibratory response and radiated noise of the engine block coupled with the rotating crankshaft and gear train shafts which drives the fuel injection pump and valve system. The exciting forces acting on the engine block and shaft system are combustion pressure, inertia forces of the moving parts, piston slap forces, fuel injection pressure and valve driving force and torque. Theoretical procedures consist of the following four steps; (1) Dynamic characteristics of the engine block and shafts are determined separately by Finite Element Method or experimental modal analysis, (2) Normal mode expansion technique is employed to derive the equation of motion of the total system in which rotating shafts with gear train are combined to the engine block by the oil film and contact stiffness, (3) The time histories of the vibratory response of the engine block and rotating shafts are calculated by the numerical integration technique, (4) Engine noise radiated from the engine block surface is evaluated using the Boundary Element Method. This method is applied to estimate the effect of the backlash of the gear train on the engine block vibration and radiated noise.
This paper presents the analytical method to evaluate the impact force and engine noise induced b... more This paper presents the analytical method to evaluate the impact force and engine noise induced by piston slap considering the detailed piston profile and dynamic characteristics of the piston. This method was applied to examine the effect of the piston profile and piston pin offset on the piston slap impact force and its induced engine noise. Present numerical method showed that increasing the upper clearance of the piston skirt enlarged the higher frequency components of the piston impact force and engine noise and this was verified by the experimental results. The analysis revealed that piston movement at the vicinity of the combustion top dead center was governed by the friction moment around the piston pin and the additional piston pin offset moment induced by combustion pressure could cancel this friction moment and reduce the piston impact force if the piston pin was offset to the major thrust side. This analytical results was confirmed by the measured results of actual diesel engine.
The Proceedings of the Dynamics & Design Conference, 2003
High・ speed diese 置 engines for motor vehicles and constmction machineries are required sound red... more High・ speed diese 置 engines for motor vehicles and constmction machineries are required sound reduction and good sound quality aleng with high performance and clean exhaust gas emission ． In order to produce the good engine so し md ， it is important that engineers estimate the engine sound and evaluate it in the ear 且 y design phase ， This paper presents a theoretical approach to estimate the time history of engine sound and an evaluation approach ofengine sound qua 疑ty using wavelet transfbmm．
Transactions of the Japan Society of Mechanical Engineers Series C, 2010
This paper presents the theoretical method to pred孟 ct the prQpagation of struct ロ re − b〔，rne sG... more This paper presents the theoretical method to pred孟 ct the prQpagation of struct ロ re − b〔，rne sGund of fiuid − Jeaded structure by using Statistical Energy Analysis (SEA) ． The effects of fiuid on sound transmission are considered as the change of mode llulnber and the increase of internal bss factof of 且uid − loaded elements in the speci 且 ed frequency range of SEA model ． The complex ・ valued added rnass ｛ s use 〔艮to describe the fiuid loaded effect and 丗 e sound pressure propagation to the adlacent plate in the nuid is eva ］ ua 亡 ed as the change of transmission coef 丑cient at L and X ． ・ type junct ｛ on consistirlg of fiuid − 10aded plates ． These analyticul procedures are applied to deterlnine the vibration energy transmission 呈 n the plate struc ヒ ure con 仁 aining the water tank The calculated results agrees well with the Incasured one and the avai 置 ability of this method is confirmed ． Key 四 〇 lylS ： Sound and Acoustic ， Vibrati 〔 〕n Coupled with Fluid Motion ， Noise Control ， Structure Borne S〔川 nd ， SEA
This paper presents the theoretical procedure to predict the vibratory response and radiated nois... more This paper presents the theoretical procedure to predict the vibratory response and radiated noise of the engine block coupled with the rotating crankshaft and gear train shafts which drives the fuel injection pump and valve system. The exciting forces acting on the engine block and shaft system are combustion pressure, inertia forces of the moving parts, piston slap forces, fuel injection pressure and valve driving force and torque. Theoretical procedures consist of the following four steps; (1) Dynamic characteristics of the engine block and shafts are determined separately by Finite Element Method or experimental modal analysis, (2) Normal mode expansion technique is employed to derive the equation of motion of the total system in which rotating shafts with gear train are combined to the engine block by the oil film and contact stiffness, (3) The time histories of the vibratory response of the engine block and rotating shafts are calculated by the numerical integration technique, (4) Engine noise radiated from the engine block surface is evaluated using the Boundary Element Method. This method is applied to estimate the effect of the backlash of the gear train on the engine block vibration and radiated noise.
This paper presents the analytical method to evaluate the impact force and engine noise induced b... more This paper presents the analytical method to evaluate the impact force and engine noise induced by piston slap considering the detailed piston profile and dynamic characteristics of the piston. This method was applied to examine the effect of the piston profile and piston pin offset on the piston slap impact force and its induced engine noise. Present numerical method showed that increasing the upper clearance of the piston skirt enlarged the higher frequency components of the piston impact force and engine noise and this was verified by the experimental results. The analysis revealed that piston movement at the vicinity of the combustion top dead center was governed by the friction moment around the piston pin and the additional piston pin offset moment induced by combustion pressure could cancel this friction moment and reduce the piston impact force if the piston pin was offset to the major thrust side. This analytical results was confirmed by the measured results of actual diesel engine.
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