Abstract
In this work, a rib design process is proposed to improve the local stiffness of gearbox housing for agricultural electric vehicles. Unlike conventional engines, electric powertrain noise includes high frequency factors and pure tones. Considering these characteristics, local stiffness was evaluated in the frequency range of interest for the prediction of dynamic behavior. The local stiffness of the gearbox housing was evaluated using the finite element (FE) model. Experimental modal analysis and FE model update were conducted to ensure the reliability of the results. Using the results of local stiffness evaluations, the stiffness weak point was identified, and the rib design location was selected through a strain analysis. The shape of the ribs was parameterized by width, length, and height, and parameter studies were used to compare the local stiffness increase rate according to the rib design pattern. According to the results, the stiffness increase rate against the same mass was distributed differently according to the rib shape, and the most efficient rib shape was selected from a manufacturing perspective.
Highlights
The development of eco-friendly vehicles through the electrification of powertrains is becoming an active area of research, and the demand for the development of such electric vehicles has been increasing in the agricultural machinery industry [1]
Theoflocal stiffness housing was numerically evaluated based on an Thisrib study aimed to improve the stiffness the gearbox of agricultural electric vehicles model to confirm the stiffness improvement according to the rib design
It reflected dynamic evaluated in the validated model to identify weakness in the stiffness, and rib design was conducted characteristics of the actual gearbox housing through the experimental modal analysis (EMA) and finite element (FE) model update process
Summary
The development of eco-friendly vehicles through the electrification of powertrains is becoming an active area of research, and the demand for the development of such electric vehicles has been increasing in the agricultural machinery industry [1]. Because the noise problem of electric vehicles is quite different from that of conventional engine driven vehicles, the existing sound design method can no longer be used [3]. The noise of electric vehicle powertrains includes high frequency factors and pure tones, and these are more annoying to the operator [4]. Because they operate at a relatively high rotation speed and low torque compared to internal combustion engines, the motors are generally manufactured by integration with a reduction gearbox
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