To enhance the vibration suppression capability of bearing housings in the motor propulsion systems of the underwater vehicle, a structural optimization method based on high-damping manganese-copper (Mn-Cu) alloy was proposed as an alternative to conventional titanium alloy. To control the overall mass increase associated with the material substitution, the periodic weight-reduction holes were introduced in the sleeve region of the bearing housing, while key installation interfaces were retained. Finite element simulations were carried out to systematically investigate the effects of hole diameter and spacing on the stiffness, strength, and thermal expansion performance of the housing. The relationship between geometric parameters and mechanical behavior was clarified, and an optimized configuration with balanced performance was identified. To further verify the effectiveness of the design, vibration transmissibility tests were conducted. The results show that the Mn-Cu alloy bearing housing exhibits significantly lower vibration transmissibility than its titanium counterpart within the frequency range of 0~500 Hz, which indicates superior low-frequency vibration attenuation performance. High-damping alloys can maintain essential mechanical properties while significantly improving vibration isolation characteristics with proper structural optimization. A feasible approach and theoretical support are provided for its application in the complex power equipment.
LIU Jian-yu, LI Xin-bin, XU Ya-jun, LIU Jing.
Structural Design of a Damping Alloy Bearing Housing and Experimental Verification of the Vibration Suppression Performance[J].
Science Technology and Engineering, 2026, 26(20): 8642-8654 DOI:10.12404/j.issn.1671-1815.2600460
由于较小孔径需布置更多数量的开孔,在确保加工可行性的前提下,Φ4 mm 开孔方案刚度下降幅度较小,结构仍保持良好的整体刚性;随着孔径超过4 mm,由于材料截面积进一步削弱局部刚度导致整体变形增加,整体刚度下降显著。图5为不同孔径下的轴承座变形分布云图。从变形分布云图(图5)可以观察到,大孔径方案在套圈区域的径向刚度分布更不均匀,易在孔边缘诱发局部变形集中现象,对结构疲劳寿命产生潜在不利影响。因此,在权衡减重需求与刚度保持时,应优先选择较小孔径设计,以实现性能与质量的优化平衡。
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