Power analysis of metal couplings

- Aug 29, 2019-

The rubber metal coupling is installed between the reducer shaft and the shaft of the main power unit shaft shaft to realize the function of transmitting the torque to reduce the vibration level transmitted from the main steam turbine unit to the shaft system by connecting the outer drum and the inner drum. The rubber-metal combination device realizes the centering compensation and is an important device for reducing the vibration and noise of the ship. Based on the rubber viscoelastic theory, the influence of the tensile and compressive stress generated by the rubber component of the rubber metal coupling on the vibration damping performance of the rubber material during high-speed rotation is discussed, and the coupling is determined by the finite element based on the structural material. By changing the input speed and torque, the coupling can achieve the best damping effect under the premise of ensuring the same transmission power, which has a certain guiding significance for the engineering application of this type of coupling.

The main components of the rubber metal coupling include the outer drum inner drum driven wheel drive wheel gear coupling coupling hub rubber metal device sprocket and the like. The rubber metal ring is the main vibration damping and noise reduction component of the coupling. The rubber metal ring consists of a steel-only hub that is joined by a vulcanized high-strength rubber block. When the coupling transmits torque, the outer drum structure by the inner drum rubber metal device makes the force exerted on the rubber member not the torque received by the rubber member on the transmission coupling, but the tension and pressure. Therefore, the damping characteristics of the rubber member are mainly manifested by tensile and compressive stiffness and viscoelastic damping, rather than torsional stiffness.

The vibration and noise reduction of the viscoelastic damping material is mainly achieved by dissipating the vibration energy, and the dissipation of the energy of the unidirectional tension and compression vibration

In order to improve the vibration damping effect of the viscoelastic damping material, it is necessary to increase the dissipating energy. The Young's modulus and the loss factor of the polymer viscoelastic material vary greatly with environmental factors, especially the temperature frequency strain amplitude and the pre-compression amount change, wherein the temperature and frequency are basically maintained. It is changed, so it is considered to be calculated by multi-body dynamics theory.