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提升液压挖掘机的散热能力与降低噪声之间相互矛盾、相互制约,是产品设计阶段的重点和难点。为了更高效地匹配散热系统,并尽可能地节能降噪,通过分析某小型液压挖掘机的噪声频谱,准确识别主噪声源,结合计算流体力学分析,对整车散热腔风道进行优化,最终在满足热平衡需求的前提下,使整机机外辐射噪声降低5.0 dB(A),冷却风扇转速降低400 r/min,冷却风扇能耗降低40.9%。
To enhance the hydraulic excavator cooling capacity and reduce the noise between the contradictions and mutual constraints, the product design phase of the focus and difficulty. In order to match the heat dissipation system more efficiently and save energy and noise as much as possible, the noise spectrum of a small hydraulic excavator is analyzed to identify the main noise source accurately. Combining computational fluid dynamics analysis, Under the premise of meeting the heat balance requirement, the whole machine radiation noise is reduced by 5.0 dB (A), the cooling fan speed is reduced by 400 r / min, and the cooling fan energy consumption is reduced by 40.9%.