According to the operating conditions of high-speed railway traction gear transmission system, different experimental conditions are designed and steady-state experiments are carried out, so as to obtain the vibration characteristics and laws of helical gear transmission system under different loads and speeds. The construction and layout of high-speed rail traction gear transmission system experimental platform are shown in Figure 1. Since the rated output speed of the drive motor is far lower than the input speed of the high-speed rail traction gearbox required for the experiment, the accompanying test gearbox is added as a speed increaser.
In order to reduce the attenuation of signal during transmission, vibration acceleration measuring points shall be arranged near the vibration source, such as the bearing seat of gearbox. The vibration acceleration measuring points are arranged at the input bearing pedestal and the output bearing pedestal on both sides, as shown in Figure 2. Each measuring point has three directions (transverse, vertical and axial), and the number of measuring points is 1X, 1y, 1z, 2x, 2Y, 2Z, 3x, 3Y and 3Z. Measuring point 1 is at the input bearing seat, and measuring point 2 and measuring point 3 are at the output bearing seat.
Two groups of experiments were carried out:
(1) No load test: remove the influence of load excitation. At this time, the influence of motor speed fluctuation can be ignored, and the vibration response signal of the system can be considered to be caused only by the internal excitation of the gear transmission system;
(2) Stable condition experiment: obtain the steady-state vibration response signals under different experimental conditions and study the dynamic characteristics of the system. The stable condition experiment can be divided into stable speed condition and stable torque condition. The high-speed railway traction gearbox is divided into forward rotation (counterclockwise is forward rotation from the direction of input shaft) and reverse rotation. The pinion shaft has a rated input speed of 4100r / min, a rated output speed of 1688r / min and a rated input torque of 1300n · M, The rated output torque is 3160n · M.