Abstract We developed a hammering sound inspecting system using AE sensor with objectivity and recordability and confirmed that it is possible to grasp the state of concrete (internal cavity and surface peeling) from the vibration analysis result obtained , And confirmed the usefulness of concrete health diagnosis using this system. ...
英字タイトル:
Development of nondestructive inspection system for soundness diagnosis of concrete structure

In the future social infrastructure diagnosis for concrete structures such as bridges, tunnels and buildings, it is expected that the digital hammering inspection, which is objective, quantitative, and recordable to the conventional hammering inspection, will play a significant role. However, since there are a wide variety of defects due to poor construction and age-related deteriorations in the concrete structures, they have not been quantitatively identified enough by the digital hammering inspection in t...
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A study on internal structure diagnosis of concrete structures incorporated with digital hammering inspection, AI and simulation technologies (1) Direct problem analysis using AI

One of the most common inspection methods for concrete structures is hammering inspection. While this method makes it possible to quickly inspect a vast number of inspection targets, it has the problem of lacking objectivity of judgment results and recordability. In this study, we aimed to develop a technology to quantitatively diagnose the internal structure of concrete structures by digital hammering inspection. The approach of the research was to build an AI trained by CNN with a database that relates th...
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A study on internal structure diagnosis of concrete structures incorporated with digital hammering inspection, AI and simulation technologies (2) Inverse problem analysis using AI

In this paper, we discuss the results of application of “Integrated system of digital hammering inspection and digital visual inspection” to the detectability of flacking, cracks and backside cavities of the tunnel lining as well as flacking and backside cavities of concrete paving in a national highway tunnel....
英字タイトル:
Development of diagnostic technology for concrete structures using digital hammering inspection

Non-destructive testing technique was developed for embedded plates using phased-array ultrasonic testing (PAUT). The bending angle of their studs was quantitatively estimated by using the sector scan of PAUT, which is usually difficult by using conventional UT. In addition, this technique is capable of visualizing the weld shape of the stud by using the linear scan of PAUT. Mockup tests were carried out in order to verify the effectiveness of the technique....
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Development of Testing Technique on Embedded Plates Using Phased-Array Ultrasonic Testing

We have developed a simple diagnosis method using an AE (Acoustic Emission) sensor applicable to chemical anchors in nuclear power plants. With purpose of its application to the field, waveform database to identify improper installation or ageing was constructed. We also confirmed applicability of the diagnosis method to other types of anchor (e.g. anchor bolts, mechanical anchors). Details of development chronology are described in this paper. . ...
英字タイトル:
Developing a simplified diagnosis method for anchor bolts

We have developed a simplified diagnosis method of hammering inspection using AE (Acoustic Emission) sensor applicable to chemical anchors in nuclear power plants. The database was created to identify improper installation and aging of the anchors. We have also confirmed its applicability to other types of anchor (e.g. anchor bolts, mechanical anchors). The details of development process are described in this paper....
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Developing a simplified diagnosis method for anchor bolts (2)

The recent situation of nuclear power generation gradually requires not only the economic viewpoint but also even greater efforts in accurate evaluations on safety and availability issues. Accordingly, assessments on the integrity of structural components are critical both now and in the future. Structural materials which suffer from age-related degradations especially should have methods to evaluate degradations due to changes in material properties. It is clear that conventionally used extrapolations of...
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Integration of modeling, database and inspection technique for the prediction of the material behavior under irradiation

Abstract As an attempt to apply AI in the field of maintenance, we have been studying "forward analysis", "inverse analysis" and "future prediction". As for the “forward analysis”, as a theoretical verification of the digital hammering inspection results using the AE sensor, the natural frequency obtained in the hammering inspection is confirmed by “time history response analysis”. Because there is a combination of the shape, material properties to be inspected, measuring position of natural frequency, etc....
英字タイトル:
Attempts of forward analysis, reverse analysis and future prediction using AI in the field of maintenance

Non-destructive evaluation technique was developed to identify the integrity of embedded hardware using digital hammering inspection with AE (Acoustic Emission) sensor. The inspection can diagnose the fixed state of the embedded hardware in terms of its natural frequency and vibration duration. Mockup tests were conducted to investigate the relationship between the change in vibration duration and the fixed state under various loads including external tensile loads and thermal loads when welding supports on...
英字タイトル:
Improvement of the efficiency of hammering inspection using AE sensor for embedded hardware 2