Vibration Characteristics Research Of Ship Fracturing Pumps

In the ship fracturing system,the fracturing pumps are installed on the deck.The deck can be damaged easily by periodical loads of pumps.This dissertation aims at figuring out the vibration characteristics of ship fracturing pumps and proposing the corresponding solution of vibration control.First of all,the ship fracturing system is divided modularly based on the ocean fracturing technological process.And the supercharging devices are selected through the parameter matching calculation process.Then,through the modal analysis of the selected fracturing pump-SQP 2500,the 1st to the 12 th natural frequency were obtained that they are at the range of 60~300Hz,which are far away from the pump’s stimulation frequency.In the meantime,the dynamic analysis is implemented on the fracturing pumps,and the pump’s maximum stimulation output is assured at its second gear by the simulation and its corresponding Fourier transform.In the second place,the skid-mounted ship fracturing pump device’s rigid-flexible coupling-dynamic model is established,the connection type between the skid-mounted ship fracturing pump device and the deck is discussed and analyzed under the pump’s second gear.The analysis result shows that the deck structure will be under insufficient intensity when the four-nodes fixation is applied,the deck will produce plastic strain and thermal strain when the eight-nodes fixation is applied,the stimulation loads on the deck will be attenuated by almost 40 percent and the structural intensity is satisfied when the flexible connection is applied by the GERB KSR-11-FS1300 vibration isolator.In the third place,the element model of the deck is established,and the layout of the skidmounted fracturing pump device on the deck is analyzed.There are two initial layout schemes with the overall consideration about the dimensions of the deck and the skid-mounted fracturing pump device,the space utilization of the ship fracturing system.Through the transient response analysis of the deck under both layout,the deck’s response is smaller when the skid-mounted fracturing pump device is under longitudinal arrangement.Simultaneously,the fracturing deck layout planning is carried out with consideration of dimensions and mass of other modules to be arranged.At last,the fatigue reliability analysis is implemented on the supporting beam which is on the one side of the fracturing system by the S-N static fatigue design method.The result shows that the position where the risk of fatigue failure occurs is maximal will be located at circular hole which is close to the engine.And the location accords with the real location in the operation site.What’s more,the corresponding improvement measure is proposed based on the fatigue analysis results,which will provide a reference for the structural design of the supporting beam in the ship fracturing system.