Abstract
Some equipment fault measurement points are difficult to determine. Thus, this study proposes a method using energy flow and transfer path to select sensitive measurement points. Firstly, based on the energy flow theory of the shell, the energy flow is taken as the physical quantity to describe the energy transfer of the structure vibration, and the energy-based transfer path analysis method is established. Secondly, the simulation model of the finite element energy flow was established by focusing on the NC turret, and the vector image of the energy flow transfer path of the NC turret shell was created. For the relationship between the vector images of the experimental and simulation energy flows, the validity of the finite element energy flow simulation results is verified. Lastly, three abnormal areas of the NC turret shell are identified by comparing and analyzing the energy flow vector images of the NC turret in the healthy and fault states, taking the poor meshing fault of the grooves as an example. By choosing nine test points in the abnormal areas and calculating the distribution rate of the transfer paths between the test points to the joint surfaces of the fluted disc, the energy flow distribution rate of the different fault positions to the test points is obtained. Calculation results enabled us to identify three measuring points that can accurately distinguish the fault location for a typical fault mode. This research combined energy flow theory and transfer path analysis method to determine the vibration fault sensitive measuring points of NC equipment. The proposed method is practical in the field of fault diagnosis and has broad application prospects.
Highlights
At present, sensor tests serve as a major method to obtain equipment vibration data
A mature theoretical research on the location of sensors has yet to be conducted. e fault-related monitoring data, which are available for equipment with complex structures and long mean time between failures, are extremely limited. is current situation substantially increases the difficulty of fault diagnosis technology research. erefore, the application of energy flow theory in transfer path analysis will provide a new idea for equipment fault diagnosis
To solve the problem that some equipment fault measurement points are difficult to determine, this paper proposed a method for selecting the sensitive measuring points of the vibration fault based on energy flow and transfer path
Summary
Sensor tests serve as a major method to obtain equipment vibration data. A reasonable vibration sensor position can extensively monitor the status of equipment and is the basis of accurate fault diagnosis. Erefore, the application of energy flow theory in transfer path analysis will provide a new idea for equipment fault diagnosis. Zhao et al [14] provided an effective method based on matrix calculus, generalized second-moment technique, and stochastic finite element theory for the vibration transfer path system to transfer reliability. Ey identified the main vibration source and main vibration transfer path using finite element energy flow theory. Some research methods on fault location have been introduced recently [18, 19], and the combination of power flow theory and transfer path analysis method is a new direction in the field of fault diagnosis and has broad application prospects. E current study presented a method based on finite element energy flow and transfer path to determine vibration fault sensitive points. The location of the sensitive detection point corresponding to the typical fault mode was determined by calculating the distribution rate of each transfer path amongst the test points
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