Internal bolts subject to vibration, fluctuatingload, impact load or dynamic load shall be protected against loosening. Double nuts, unti-loose washers, tack welding, etc. shall be used.
The thesis designs a frequency-power automatical control unit based on PLC, enabling generators to run reliably even if in the event of heavy loadfluctuating.
本文设计了一种基于PLC控制的自动调频调载装置，可使发电机组在大负荷波动的情况下也能可靠地运行；
3
The matrix of power spectral density function of fluctuating wind load is established first.