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传感器布置困难限制了柴油机曲轴轴心轨迹试验测量方法的应用。为此,设计了曲轴轴承轴心轨迹的试验装置,采用实际柴油机的曲轴和轴承构成试验装置的主体,由电机带动曲轴旋转,模拟曲轴运转。在其中的一个轴承的同一个横截面上布置了两个相互垂直的电涡流位移传感器,测试曲轴与位移传感器之间的相对位置变化,并据此得出轴心轨迹图。由于实测的位移信号存在噪声,直接利用该信号得到的轴心轨迹误差很大。设计了低通数字滤波器对位移信号进行了滤波处理,得到了符合实际轴承负荷分布规律的轴心轨迹图。实测数据验证了该方法的可行性。
Difficulty in sensor placement limits the application of the diesel engine crankshaft axis locus test measurement method. To this end, the crankshaft bearing axial trajectory design test device, the actual use of the diesel engine crankshaft and bearing constitute the main test apparatus, driven by the motor crankshaft rotation, the simulation of crankshaft operation. In the same cross-section of one of the bearings, two mutually perpendicular eddy current displacement sensors are arranged to test the change of the relative position between the crankshaft and the displacement sensor. Due to the noise of the measured displacement signal, the error of the axis locus obtained by directly using the signal is very large. The low-pass digital filter is designed to filter the displacement signal, and the axis locus map which accords with the actual bearing load distribution is obtained. The measured data verify the feasibility of the method.