The experimental study on gear transmission system can repeat the same test condition several times, thus helping researchers to find some new phenomena. The test results can be used to verify the correctness of the gear dynamic model, and then carry out model modification for the established dynamic model.Domestic and foreign scholars have carried out many years of experimental research on fixed-shaft gear drive system and planetary gear drive system.
For fixed-shaft gear drive system, a single-stage gear drive test rig was built, and the trend of dynamic transmission error with speed was tested. The tooth detachment and amplitude jump of the system were observed under small damping.
Similar test rigs are used to test the dynamic stresses of gears and to calculate the dynamic factors of gears. The jump characteristics of amplitude-frequency response are observed with large damping.Vibration frequency of the box is tested with acceleration sensor, then acceleration in torsion direction and strain of tooth root under different conditions are tested with tooth shape error taken into account, jumping phenomenon of acceleration signal of gear is also found.
The transmission error of gears is tested with an optical encoder at low speed and quasi-static conditions.Two unidirectional acceleration sensors were used to test the dynamic transmission errors of the gears at higher speeds.Four unidirectional acceleration sensors are installed on each gear, and the mean square root values of corresponding amplitudes of the first three order rodent frequency of dynamic transmission error under different conditions are analyzed. Complex non-linear vibration forms, such as jump phenomenon, double-cycle motion, complex long-cycle motion and chaos motion, are found.
Subsequently, the effects of overlap and profile modification on the dynamic characteristics of spur and helical gears were studied with the same device.Some scholars have used test methods to study the dynamic load of gears.The influence of rotational speed on gear load in non-resonance region and the impact load of gear meshing are analyzed by means of test.The stress of tooth root of several low coincidence gears under different modification parameters is analyzed by test method.
The influence of four different tooth shapes on the dynamic characteristics of gears is analyzed in the non-resonance region.For helical gears under quasi-static conditions, the approximate relation between static transmission error and dynamic factor is analyzed by experimental method.Recently, the relationship between dynamic transmission error and dynamic factor of modified and unmodified gears has been analyzed by test method. Dynamic transmission error is also measured by two unidirectional acceleration sensors and strain gauges are installed at the root position.The strains of the tooth roots were tested at low and high speeds, respectively, to obtain the dynamic factors of the gears.