Bolt Pre-tightening Force Attenuation Prediction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods lack an accurate and reliable way to predict the attenuation of pre-tightening force in bolt connections, especially under harsh environmental conditions, due to the complexity of influence factors and limited detection means.
Innovation Solution
An apparatus and method that includes a pre-tightening force coefficient measuring device with a clamping assembly, detecting assembly, tightening assembly, and time length measuring assembly, along with a vibration test device, to measure and predict the attenuation of pre-tightening force using support vector regression models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bench vibration test is used to detect pre-tightening force through pressure sensor, then detection accuracy is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent replaces the mechanical pressure sensor detection system with an ultrasonic detection system. The ultrasonic detector measures the time length of ultrasonic wave propagation through the bolt, which correlates with the pre-tightening force. This substitution eliminates the need for complex mechanical pressure sensors while achieving accurate detection of pre-tightening force attenuation during vibration tests.
Solution Approach 2:
The patent changes the detection parameter from direct mechanical force measurement to ultrasonic time length measurement. By measuring the propagation time of ultrasonic waves through the bolt, the system indirectly detects pre-tightening force with higher accuracy and simpler equipment. The ultrasonic wave speed in the bolt material changes with applied force, providing a reliable proxy measurement.
2Measurement precision
If multiple influence factors are considered in pre-tightening force attenuation prediction, then prediction accuracy is improved, but model complexity increases
Solution Approach 1:
The patent segments the complex prediction problem into distinct components: vibration frequency, amplitude, duration, and multiple bolt influence factors (material, diameter, length, pre-tightening force). Each factor is analyzed separately using support vector regression models, allowing systematic handling of complexity while maintaining high prediction accuracy for pre-tightening force attenuation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides accurate and reliable prediction of pre-tightening force attenuation, ensuring the reliability of bolt connections and aiding in anti-loosening design and maintenance cycles.
Implementation Method 1
an ultrasonic probe corresponding to the piezoelectric ceramic sheet; wherein the ultrasonic probe is in driving connection with the driving mechanism to drive the ultrasonic probe to move linearly so as to contact and leave the piezoelectric ceramic sheet
Data Source
AI summary
The present disclosure provides an apparatus and a method for predicting attenuation of a pre-tightening force of a bolt, which relate to the field of prediction on the pre-tightening force of a bolt. The apparatus for predicting attenuation of a pre-tightening force of a bolt includes a pre-tightening force coefficient measuring device, including a clamping assembly, a pre-tightening force detecting assembly, a tightening assembly and a time length measuring assembly. The clamping assembly is configured to fix a bolt to be detected; the pre-tightening force detecting assembly is configured to measure the pre-tightening force to the bolt; the tightening assembly is configured to apply the pre-tightening force to the bolt; the time length measuring assembly is configured to measure a time length of each sampling in the process of tightening the bolt.