Acceleration working condition suspension vibration isolation calculation method for eliminating pavement excitation

Abstract

The invention discloses an acceleration working condition suspension vibration isolation calculation method for eliminating road surface excitation. The method comprises the following steps that (1) arranging acceleration vibration sensors at the active end and the passive end of a suspension, adopting a GPS for monitoring the vehicle speed, adopting a CAN line for monitoring the rotating speed ofan engine, in LMS software, setting the tracking mode to be up / Down, and tracking the vehicle speed; 2) continuously testing acceleration and neutral gear flameout sliding working conditions, and collecting vibration of the active end and the passive end of the suspension; and 3) the vibration signals of the active end and the passive end of the suspension obtained by testing are mixed signals ofengine excitation and pavement excitation. According to the invention, through calculating suspension active and passive end vibration signals under an acceleration working condition and a neutral gear flameout sliding working condition: vWOT _ ES-VFD _ ES, VWOT _ BS-VFD _ BS, the active end vibration signals and the passive end vibration signals of the suspension for eliminating road surface excitation are obtained. The road surface excitation parts in the active end vibration and the passive end vibration of the suspension obtained through testing can be separated. The pure engine excitation is obtained, and therefore the suspension vibration isolation amount for eliminating the road surface excitation influence is obtained through calculation.

Description

technical field [0001] The invention relates to the field of automobile driving, in particular to a calculation method for suspension vibration isolation under acceleration conditions without road surface excitation. Background technique [0002] The existing formula for calculating the vibration isolation of the mount under acceleration conditions is 20log(VES / VBS), where VES is the vibration of the active end of the mount, and VBS is the vibration of the passive end of the mount. The existing calculation method has problems: it cannot be avoided The impact of road surface excitation on vibration isolation calculations leads to inaccurate calculated vibration isolation. The vibration isolation of the mount under acceleration conditions is the case of high engine torque output. The attenuation ability of the engine excitation when the mount is under pressure is investigated. . In the vibration of the active and passive ends of the suspension obtained from the test, in addit...

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Problems solved by technology

[0002] The existing formula for calculating the vibration isolation of the mount under acceleration conditions is 20log(VES / VBS), where VES is the vibration of the active end of the mount, and VBS is the vibration of the passive end of the mount. The existing calculation method has problems: it cannot be avoided The impact of road surface excitation on vibration isolation calculations leads to inaccurate calculated vibration isolation. The vibration isolation of the mount under acceleration conditions is the case of high engine torque output. The attenuation ability of the engine excitation when the mount is under pressure is investigated.

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