Gear system dynamics is a complex multi-coupling dynamics system, which strictly follows the system input-carrier analysis-response output dynamic control response analysis system module. Dynamic excitation (system input 🙂 can be divided into the prime motor or load action of the external excitation and gear pair, bearing geometric error and mechanical properties of the internal excitation; System model, as the main carrier of system analysis, covers system modeling methods, analysis models and influencing factors, etc., which can be used to build local or global analysis models through specific analysis objects for in-depth research on specific objects and research on specific influencing factors. Through the simulation modeling analysis of the excitation and the model, the corresponding dynamic response output is obtained, so as to obtain the influence of the study object and optimize and improve the influence parameters of the system dynamics, so that the selection of initial system parameters and system design achieve system stability and high efficiency; Finally, combined with the application of gear dynamics theory, relevant empirical formula or diagnostic identification output is carried out, such as: gear pair system dynamic load coefficient calculation, vibration and noise reduction and evaluation, system parameter state monitoring and diagnosis identification, load identification and system dynamic design and so on. Drawing of gear system dynamics macro effect the whole theoretical system of system dynamics, allows researchers to control of the overall system status, analysis, easy to find the accurate study the breakthrough point, to build an independent correlation system dynamics analysis model to realize quickly, conveniently and effectively study the response and the response system identification. In order to further elaborate the accurate influence of the relevant factors of the gear system, the framework diagram of the system analysis of a single stage gear transmission is drawn, and the influence of the geometric features and micro-scale effects on the system input excitation factors is elaborated in detail.
Single-stage gear transmission is also a complex dynamic response system, which also follows the strict response system of power input-carrier receiving-power output and feedback. The main components of gear transmission device: gear, rotating shaft, supporting bearing and packaging box. According to the dynamic transmission from the inside to the outside of the transmission path: the gear is transferred to the connected assembly transmission shaft, to the rotating transmission shaft supporting part bearing, and finally to the total supporting box, and through the box vibration caused by a series of dynamic response characteristics.
For gear pair system dynamic incentive features, in addition to external prime mover excitation load, its main not smooth incentives came mainly from the geometry of the gear pair, the micro interface role in medium and long term operation caused by unbalanced secondary factors, due to the particularity of the gear meshing function, can be divided into along the action line LOA and the meshing gear mesh OLOA. The main motivating factors along the gear LOA are tooth meshing force and tooth flapping force. The main excitation factor of OLOA along the gear is tooth friction. Keep going back, mainly due to the gear tooth surface meshing force load deformation resistance caused by the time-varying mesh stiffness and geometry design processing and manufacturing work together cause tooth profile machining error caused by the gear transmission error of gear tooth surface and cause, transmission error cause design of tooth surface meshing force appear under the ideal state of meshing position error, and lead to partial load or gear tooth surface meshing force between the phenomenon such as the stress distribution is not stable. The flapping force is mainly caused by the gear meshing fluctuation caused by the geometric machining error, the uneven toothed clearance of the assembly gear side, the load input and the velocity fluctuation, etc., which results in the alternating flapping phenomenon between the working and non-working tooth surfaces, and the gnawing or gnawing effect of the alternately meshing between single and double teeth. Along the tooth surface of gear OLOA friction effect mainly due to the tooth lubricating state (such as viscosity, temperature, etc.) between the performance of the change and processing or wear caused by the tooth surface micro geometry changes cause tooth surface roughness change caused by the friction coefficient, and due to the roller in the process of gear meshing transmission effect, makes the section in the wire mesh in rolling state, the other along the addendum and dedendum direction roller effect, and different roller mesh points of rate and the coefficient of friction were different.
The external manifestation of dynamic response mainly has two forms: the case vibration along the assembly propagation path and the noise transmission of meshing vibration air vibration. The main responses are the characteristic response of sidecand frequency noise with left and right meshing frequency distribution, the response of slapping noise with uneven acceleration and the noise of radiated noise, etc. The main manifestations are consistent with the test monitoring method (measuring the acceleration or displacement of fixed point vibration and the noise receiver).
