6 results about "Multiple failure" patented technology

This invention relates to a method for early warning of the resilience margin of mountain roads during rainstorms and floods based on multiple failure mechanisms. The method includes: acquiring multi-source monitoring data in real time; preprocessing the data to obtain an extended state vector at the current moment; establishing resilience critical boundaries for different failure mechanisms based on pre-generated labels, forming a multi-failure mechanism resilience critical boundary model library; mapping the extended state vector to the multi-failure mechanism resilience critical boundary model library, calculating the resilience margin of each mechanism component, and obtaining the comprehensive resilience margin and the current candidate dominant failure mechanism based on the resilience margins of each mechanism component; determining the current warning level and the final dominant failure mechanism based on the resilience margins of the mechanism components and the comprehensive resilience margin, combined with set warning conditions; and outputting warning information and linkage control commands corresponding to the current warning level and the final dominant failure mechanism. Compared with existing technologies, this invention has advantages such as strong interpretability, high lead time, good stability, and strong linkage targeting.

The invention discloses an intelligent inspection method for hoisting equipment based on multiple failure modes, and relates to the technical field of health management of the hoisting equipment, and the method comprises the steps: carding the whole life cycle typical damage and failure modes of a port crane structure, mechanism and electric control system, and constructing a typical failure / failure mode library; and based on the typical failure / fault mode library, analyzing a fault causal chain, and constructing a multi-level failure / fault tree model covering the structure and the transmission and electric control system. Cooperative monitoring of a multi-system coupling damage mode is achieved by constructing a multi-level failure / fault tree model covering a structure, a transmission system and an electric control system, traditional routing inspection is only aimed at a single system and cross-system faults prone to missing detection, and then relevance of mechanical abrasion, hydraulic leakage and electrical faults is synchronously tracked through fault causal chain analysis, so that the fault detection accuracy is improved. Electric-mechanical-hydraulic full-chain diagnosis is formed, and the positioning precision of complex faults is remarkably improved.

The monitoring device includes: an operation record acquisition unit that acquires operation records for multiple failure cases; a threshold setting unit that sets a threshold; a loss rate acquisition unit that acquires a loss rate representing the degree of wear and tear on the device corresponding to operating time; a failure rate cumulative frequency acquisition unit that acquires the shift of the failure rate cumulative frequency for the multiple failure cases relative to the loss rate; an evaluation index calculation unit that calculates an evaluation index as a value obtained by integrating the failure rate cumulative frequency with the loss rate; and a notification unit that notifies the user that maintenance is required when the loss rate, derived from the relationship between the load rate or load change rate of the monitored device and the threshold, reaches a given management value determined based on the shift of the failure rate cumulative frequency for the failure cases, wherein the threshold setting unit sets the threshold such that the evaluation index is minimized.

The present application belongs to the technical field of finite element analysis, and proposes a hammer pin articulated rotor probability life prediction method based on multiple failure modes: firstly, the hammer pin articulated rotor in the forage rubbing crusher is respectively subjected to deterministic fatigue life prediction, deterministic wear life prediction and deterministic vibration fatigue life prediction; secondly, the hammer pin articulated rotor is subjected to uncertainty analysis based on the deterministic fatigue life prediction result, the deterministic wear life prediction result and the deterministic vibration fatigue life prediction result of the hammer pin articulated rotor; then, the hammer pin articulated rotor is subjected to probability fatigue life prediction, probability wear life prediction and probability vibration fatigue prediction based on the uncertainty analysis result of the hammer pin articulated rotor. The present application can accurately predict the life of the forage rubbing crusher and similar machines.

The invention relates to a creep-corrosion-hydrodynamic fatigue coupled deformation calculation and life evaluation method and device for a prestressed beam bridge, and a storage medium. The method comprises the following steps: establishing a beam bridge hydrodynamic simulation model containing a time-varying creep constitutive structure and prestressed tendons; parameters such as concrete creep, prestress relaxation, prestressed tendon corrosion depth and hydrodynamic fatigue cracking depth are updated year by year, the failure area of prestressed tendons is determined based on a corrosion and fatigue competition criterion, and the interface bonding performance is calculated. Then hydrodynamic force and long-term effect coupling simulation is carried out, mid-span deflection, relative displacement of piers and prestress amplitude are extracted, and then the corrosion-hydrodynamic force fatigue life of the prestressed tendons is evaluated. And iteratively calculating until the mid-span deflection, the service life or the fatigue life reaches a critical value, and outputting a deformation time-history curve. Compared with the prior art, the method has the advantages that the hydrodynamic accumulated displacement fatigue effect and the multi-factor coupling effect are considered, the minimum service duration is determined through multiple failure modes, and the actual situation can be comprehensively represented.