cae在汽車nvh方面的應(yīng)用-資料下載頁
2025-05-13 06:33本頁面
【正文】 iffness Engine as rigid elements with springs for mounts ? Analysis Load path analysis to quantify paths Mode shape analysis to identify contributing modes ? Subsystem Design Remendations Identify Important Load Paths ? Response due to vertical engine mount forces is the largest ? Right Hand engine mount vertical and F/A forces produce the highest response ? RH and FR mount forces produce ~75% of response ? Reduce RH mount force and sensitivity of steering column response to vertical input at right mount All Engine Mounts RH Mt Fx+Fz FR Mt Fx + RH Mt Fx + Fz Steering Column Vertical Response due to Engine Mounts Identify Contributing Modes ? Minimum response between 1st bending and steering column vertical bending mode ? Response is minimized by reducing body bending frequency and increasing steering column vertical bending mode ? After idle speed is set, tune steering column frequency to minimize response Optimum Idle Speed Steering Column Response Body Bending Mode All Modes Steering Column Bending Idle Shake Solution Approach ? Vehicle Level Performance Metrics Steering wheel vertical and lateral acceleration Compare response to target levels ? Model FE model of total vehicle Suspension model consists of rigid elements and springs for bushing stiffness Engine as rigid elements with springs for mounts ? Analysis Load path analysis to quantify paths Mode shape analysis to identify contributing modes ? Subsystem Design Remendations Steering Column Idle Shake Baseline Design Mod 1 Target Design Mod 2 ? Design Mod 1Reduce mount stiffness at FR and RH Mounts. ? Peak response is reduced by 50% at 750 RPM and 20% at 900 RPM by reducing engine mount stiffness ? Design Mod 2Increase stiffness of the steering column in addition to the reduction in engine mount stiffness ? Steering column idle shake meets target at 750860 RPM for DM 2 Idle Shake Design Guidelines ? Optimum idle speed is between body bending and steering column bending modes ? Idle RPM should be at least 120 RPM (2 Hz) from fundamental modes ? Identify engine mounts that cause large response and minimize mount stiffness at these mounts Optimum Idle Speed Steering Column Response Body Bending Mode All Modes Steering Column Bending Baseline Design Mod 1 Target Design Mod 2
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