Bolt looseness detection

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August undefined, 2024

WebNov 9, 2024 · The delayed fracture of high-strength bolts occurs frequently in the bolt connections of long-span steel bridges. This phenomenon can threaten the safety of structures and even lead to serious accidents in certain cases. However, the manual inspection commonly used in engineering to detect the fractured bolts is time-consuming … WebDOI: 10.1002/cpe.7713 Corpus ID: 257989363; Bolt looseness detection based on Canny edge detection algorithm @article{2024BoltLD, title={Bolt looseness detection based on Canny edge detection algorithm}, author={}, journal={Concurrency and Computation: Practice and Experience}, year={2024} }

An Image-Based Algorithm for the Automatic Detection of Loosened Bolts

WebMar 21, 2024 · This paper proposes a novel bolt looseness detection method based on audio recognition and deep learning. Firstly, a percussion experiment was designed to collect audio signals of bolts at ... WebAug 31, 2024 · A shear horizontal (SH) guided wave-based bolt looseness detection method, excited by a magnetostrictive patch transducer (MPT), is presented in this … if p 6 q 7 and r 8 the value of

Percussion-based bolt looseness monitoring using intrinsic …

WebJul 15, 2024 · In chapter 2, the feasibility of bolt looseness detection based on EMI was analyzed through theoretical deduction. In chapter 3 and chapter 4, finite element model that couples the electrostatic field and the mechanical field was established, and the relationship between excitation frequency and detection range was explored, which was also ... WebBolted joints are among the most common building blocks used across different types of structures, and are often the key components that sew all other structur WebJan 1, 2024 · Overall, this research demonstrates that the AE technique is valid to characterize friction and collision between asperities on the bolted interface, thus providing a new direction for multi-bolt looseness detection, and the proposed shapelet-enhanced AE method has substantial potential in the field of structural health monitoring (SHM). ifp6570 viewsonic

A comprehensive review of loosening detection methods …

A Review on the Bolted Flange Looseness Detection Method

WebDec 15, 2024 · Recently, for bolt looseness detection, percussion-based methods have attracted more attention due to their advantages of eliminating contact sensors. The core issue of percussion-based methods is audio signal processing to characterize different bolt preloads, while current percussion-based methods all depend on machine … WebFeb 28, 2024 · Generally, PZT-based bolt looseness detection depends on two working principles, namely stress wave sensing and electromechanical impedance (EMI) approach. The stress wave sensing method fully utilizes the piezoelectric effects of PZT and further variations of wave propagation to distinguish looseness conditions [32], [33], [34], [35]. ifp7532-2Web21 rows · Apr 1, 2024 · The development trend of bolt looseness detection technology is prospected. Abstract. Loosening of ... is student loan forgiveness a scam

"WebApr 1, 2024 · The bolt-loosening detection method using vision-based technique is summarized and a new gray gradient enhancement method is proposed to improve the stability of the nut edge detection and bolt ... " - Bolt looseness detection

Bolt looseness detection

WebDec 1, 2024 · Compared to the current audio signal processing method in percussion-based methods for bolt looseness detection, the proposed 1D-MALSTM networks combine the features extraction and classification into one framework, thus achieving looseness detection directly from raw percussion-induced sound signals. Particularly, it … WebSimilar guided wave SHM methods based on the wave energy dissipation (WED) concept were proposed by Montoya [13], Wang et al. [14] and Kedra and Rucka [15, 16] for bolt loosening detection. In ...

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WebFeb 18, 2024 · Bolt loosening is a critical factor that triggers collapse of wind turbine tower structures, and a fast and accurate bolt loosening detection is of significant importance. This paper proposes a two-stage detection framework, which combines the traditional manual torque method commonly used in engineering with the deep learning model to … WebJul 27, 2024 · The robotic arm automatically moves the PZT sensors to touch on the flange for bolt looseness detection. The flange is recognized by the cameras using YOLO convolutional neural networks with 944 image samples and located with a feature-based method and bounding boxes. The 3-dimension (3D) world coordinates from the stereo …

WebApr 16, 2024 · Looseness detection of bolted connections has been an attractive topic in multiple fields including aerospace and mechanical engineering, since loose-induced … WebApr 4, 2024 · Aiming at current serious problems that the bolt looseness can cause heavy damages and the manual bolt looseness detection is ineffective, this study presents a bolt looseness detection method based on Canny edge detector. First, HSV (hue, saturation, value) color space is used to extract the area of mark bar. Then, after expanding, eroding …

WebMar 25, 2024 · Then, a bolt looseness identification method based on ASR and coherence resonance (CR) is proposed. A quality factor index is defined, which is used to identify stochastic resonance (SR) and CR for bolt looseness identification. ... An Assembly Tightness Detection Method for Bolt-Jointed Rotor With Wavelet Energy Entropy,” WebApr 29, 2024 · Bolted connections are widely used in timber structures. Bolt looseness is one of the most important factors leading to structural failure. At present, most of the detection methods for bolt looseness do not achieve a good balance between cost and accuracy. In this paper, the detection method of small angle of bolt loosening in a …

WebSep 23, 2024 · Bolt looseness causes a reduction in its load-bearing capacity and eventually leads to the failure of a bolted joint. This paper presents an automated image-based algorithm combining the Faster R-CNN model with image processing for the quick detection of loosened bolts in a structural connection.

WebApr 13, 2024 · If the detection does not meet the detection standard for A-grade nuts, the detection system will identify that the nuts are not A-grade nuts. Currently, the precision-grade nut, also known as an A-class nut, is only defined in the international standard DIN 934, with three specifications: a length across flats of 13 mm, a thickness of 6.5 mm ... ifp750WebJul 8, 2024 · However, the bolt self-loosening caused by vibration or other issues (e.g., improper installation and chemical corrosion) may induce severe accidents. Therefore, in this paper, the author proposes a new strategy based on the acoustic emission (AE) technique to detect bolt looseness. To the best of the author’s knowledge, this research … ifp 7550WebMar 1, 2024 · Looseness detection in bolt-connected joints is vital in ensuring safety and keeping the service stability of structures. Thus, various structural health monitoring methods have been introduced for bolt looseness detection by many researchers. However, most of them studied a single bolt, which may not be readily applicable to … if p 6 r 360 then rWebJan 19, 2024 · Aiming at the problem of bolt looseness at the bottom of the train, a double-sided detection method of bolt looseness is proposed. Based on the top and the side … ifp7532WebOct 29, 2024 · When bolt looseness happens, the joint interface between bolt and nut suffers from nonlinear vibration caused by tangential relative slip and axial separation collision. ... [17] Shao J, Wang T, Yin H, Yang D and Li Y 2016 Bolt looseness detection based on piezoelectric impedance frequency shift Appl. Sci. 6 298. Go to reference in … is student loan forgiveness application openWebNov 10, 2024 · The quality of bolted connections is important for modular steel construction. This paper presents an automated looseness detection of bolted joints using faster region-convolutional neural networks (Faster R-CNN) with grid mask augmentation. Faster R-CNN has an ability to accurately detect an object and identify the object class. Our application … ifp 7550-3WebOct 15, 2016 · In this paper, a piezoelectric impedance frequency shift method is developed to estimate the bolt preload for the detection of bolt looseness in engineering structures. An experimental device that allows … is student loan forgiveness considered income