海洋工程平台齿轮箱齿轮本体温度场仿真

为齿轮强度提高、轮齿修形及优化设计提供理论支持,研究不同转速和扭矩工况下齿轮本体温度场的变化。以海洋工程升降平台齿轮箱单元高速传动轴齿轮副为研究对象,基于热学理论计算齿轮啮合面的热流密度和不同表面的对流换热系数,利用大型有限元软件Ansys将计算出来的热流密度和对流换热系数作为边界条件加载到Ansys中,对齿轮进行稳态热分析,并分析不同转速和不同扭矩齿轮在正常工况下的稳态温度场。仿真结果表明：在正常稳态工况下,主动轮与从动轮的稳态温度场分布情况相似,最高温度分布在齿轮啮合面中间区域,往周围温度逐渐降低,但主动轮的最高温度高于从动轮;主动轮和从动轮的最高温度随着转速或扭矩的逐渐增大而升高,且对应的最低温度也升高;但主动轮和从动轮单齿本体温度场分布趋势不会随着齿轮转速或扭矩的改变而改变;从温度变化来看,在不同的扭矩和转速下,齿面温度变化的斜率均较为平稳,没有出现突变情况,温度集中于齿面,并且向齿轮轴心扩散,但在距离齿根圆2.5倍模数的区域,齿轮温度梯度变化的影响较小。

Simulation of Temperature Field of Gear Body in Marine Engineering Platform Gearbox

In order to provide the theoretical support for the gear strength improvement, tooth modification and design optimization, the change of temperature field of gear body under different speeds and torques conditions are analyzed. Taken the high-speed transmission shaft gear pairs of marine engineering lifting platform gear box unit as the object, based on the thermal theory, the heat flow density and convective heat transfer coefficient of different gear meshing surfaces are calculated. The large finite element software Ansys is used, the calculation results of the heat flow density and convective heat transfer coefficient are loaded into the Ansys as the boundary conditions, the steady-state thermal analysis is carried out on the gear, and the gears with different rotation speeds and torques under the normal conditions of steady temperature field are analyzed. The simulation results show that: under the normal steady-state conditions, the steady-state temperature field distribution of the driving wheel and slave wheel is similar, the highest temperature is distributed in the middle of the gear meshing surface, and the temperature gradually decreases towards the surrounding area; but the highest temperature of the driving wheel is higher than that of the slave wheel; the highest temperature of the driving wheel and slave wheel increases with the increase of the rotation speed or torque, and the corresponding lowest temperature also increases; the temperature distribution trend of the single tooth body of the driving wheel and slave wheel does not change with the change of rotation speed or torque; as the change of the gear temperature, under different torques and rotation speeds, the slope of the tooth surface temperature change is relatively stable, and there is no abrupt change; the temperature is concentrated on the tooth surface and diffused towards the gear axis, but the influence of temperature gradient change of the gear is small in the region 2.5 modulus away from the tooth root circle.