CAJ | 학술논문

车用球轴承涡轮增压器气流激振力包括密封流体激振力和叶顶间隙气流激振力。针对某型号车用球轴承涡轮增压器，分别应用Black模型和Alford模型，计算得到密封流体激振力和叶顶间隙气流激振力。将计算结果代入模型进行仿真计算，得到密封流体激振力和叶顶间隙气流激振力对增压器转子系统临界转速、稳定性、不平衡响应的影响规律。分别与临界转速实验结果、与未添加叶顶间隙气流激振力模型计算结果、未添加密封流体激振力和叶顶间隙气流激振力的计算结果进行对比分析，结果表明：密封流体激振力增加系统阻尼，降低球轴承涡轮增压器转子系统的振幅，提升系统的稳定性；气流激振增加系统交叉刚度，降低系统稳态响应振幅。
차용구축승와륜증압기기류격진력포괄밀봉류체격진력화협정간극기류격진력。침대모형호차용구축승와륜증압기，분별응용Black모형화Alford모형，계산득도밀봉류체격진력화협정간극기류격진력。장계산결과대입모형진행방진계산，득도밀봉류체격진력화협정간극기류격진력대증압기전자계통림계전속、은정성、불평형향응적영향규률。분별여림계전속실험결과、여미첨가협정간극기류격진력모형계산결과、미첨가밀봉류체격진력화협정간극기류격진력적계산결과진행대비분석，결과표명：밀봉류체격진력증가계통조니，강저구축승와륜증압기전자계통적진폭，제승계통적은정성；기류격진증가계통교차강도，강저계통은태향응진폭。
The gas excitation force of a vehicular turbocharger rotor-ball bearing system consists of sealing fluid excitation force and tip clearance gas excitation one.Here,sealing fluid excitation force and tip clearance gas excitation one of a certain vehicular turbocharger were calculated with Black model and Alford model.The dynamic model of the turbocharger rotor-ball bearing system was simulated with the above calculation results so that the influence of sealing fluid excitation force and tip clearance gas excitation one on critical speed,stability and unbalanced response of the rotor system could be caculated.Furthermore,the simulation results were compared with those of the critical speed tests of the system, the model without tip clearance gas excitation force solely and the model without both sealing fluid excitation force and tip clearance gas excitation one.The study results showed that the sealing fluid excitation force increase the system damping decreases the amplitude of the system responses and improves the stability of the turbocharger rotor-ball bearing system;gas excitation increases the cross-coupled stiffness of the system and decreases the amplitude of the steady response of the system.