Vibration and noise suppression in the structural design of the reducer requires system optimization from three aspects: source, propagation path and system integration. The core is to reduce gear meshing impact, enhance box stiffness and improve overall dynamic stability.
1. Source Control: Optimizing Gear Design and Manufacturing
The fundamental source of vibration noise is the impact and fluctuation during gear meshing. The intensity of the excitation source can be significantly reduced by:
1. Tooth shape modification: Modify the tooth tip and tooth end of the gear or adopt a drum tooth design to reduce the impact when meshing in/out and make the transmission more stable.
2. Improve manufacturing accuracy: Ensure that the tooth pitch, tooth direction and other parameters reach high precision levels (such as AGMA high quality standards), reduce the meshing gap, and achieve smooth contact.
3. Increase the degree of coincidence: Adjust the tooth pitch and pressure angle, increase the number of teeth participating in meshing at the same time, disperse the load, and reduce the stress fluctuation of a single tooth.
4. Reasonable selection of tooth side clearance: Appropriately reduce the tooth side clearance and reduce commutation impact while ensuring lubrication and thermal expansion.
2. Propagation path blocking: Optimizing box structure design
The cabinet is the main channel for vibration transmission and noise radiation. Improving its structure can effectively suppress noise leakage:
1. Add reinforcing ribs: Add reinforcing ribs at the center of the box panel or near the bearing seat to increase local stiffness and modal frequency and suppress bending vibration.
2. Apply topology optimization technology: Combine finite element analysis (FEA) and acoustic contribution analysis to accurately identify high contribution areas, optimize material layout, and achieve the best noise reduction effect without increasing weight.
3. Additional damping or mass block: Paste damping materials (such as rubber, foam plastic) or additional mass blocks at key locations to consume vibration energy and change the resonance characteristics of the system.
4. Use high-damping materials: Use high-damping cast iron or composite materials to make the shell to improve the structure"s own vibration-absorbing ability.
3. System integration and working condition adaptation optimization
In addition to static design, assembly consistency and matching of the operating environment also need to be considered:
1. Precise assembly control: Use tools such as laser alignment instruments to ensure the coaxiality of the shaft system and reasonably preload the bearings to avoid collision and friction of components due to installation deviations.
2. Use wide temperature range grease: ensure that a stable oil film can be formed under high and low temperature conditions to prevent lubrication failure from triggering a vicious cycle of "temperature rise-noise intensification".
3. AI motion control algorithm optimization: In smart devices (such as humanoid robots), the control algorithm is upgraded to achieve smooth switching of movements and reduce shaft torsional vibration caused by torque fluctuations.
