3 results about "Specific energy" patented technology

The invention relates to an energy consumption modeling and multi-parameter risk identification method for complex stratum shield construction, and solves the problems that in the complex stratum shield construction, due to the high-dimensional and nonlinear coupling relation between geology and multiple parameters, the energy consumption prediction precision of an existing method is insufficient, and the energy consumption prediction accuracy is poor. The method comprises the steps that shield construction parameters and geological information are collected, geological features are extracted, and key parameters are screened. And constructing a Gaussian process regression model to predict tunneling specific energy, and optimizing a kernel function. Variable edge distribution is fitted, joint distribution is established through Copula, and an optimal model is selected. A sample is generated through Monte Carlo simulation, and a high-energy-consumption threshold value is set to recognize a high-risk working condition. And key parameter combinations are extracted to generate a probability density thermodynamic diagram, and risk early warning and operation optimization are realized. The method has the advantages that accurate prediction of shield construction energy consumption is achieved, the high-energy-consumption risk working condition is recognized from the probability level, and active early warning and operation optimization are supported.

A method for calculating mechanical specific energy of hydraulic percussion drilling based on a stress wave theory relates to the technical field of drilling engineering and comprises the following steps: acquiring working parameters of a hydraulic percussion drilling system, calculating actual speed of a hydraulic drill bit and actual stress acting on rocks during working by combining energy conversion of acting of an impactor and drilling fluid influence, and calculating the mechanical specific energy of the hydraulic percussion drilling system according to the actual speed and the actual stress. The actual stress acting on the rock is considered, a calculation model of the total specific energy consumed by the rock in unit volume is established, and the total specific energy in the whole drilling process is accurately evaluated through the calculation model and is applied to real-time optimization control of drilling parameters. According to the high-frequency hydraulic impactor drilling mechanical specific energy calculation method provided based on the stress wave theory, a drilling fluid-piston-drill bit-rock stress wave propagation model considering the drilling fluid influence is established, and the calculation precision of the MSE under the drilling fluid-related impact drilling working condition is improved; and a more reliable data basis is provided for MSE-based drilling parameter optimization, drilling tool state monitoring and lithology identification.