Iranian Scientists Use Ultrasound Waves to Inspect Non-Permanent Joints of Structures

‘Inspecting the loosening of non-permanent joints in structures by stimulating the base by using ultrasonic waves’ is the title of the research project of Aqil Yousefi Kama, a professor of the Advanced Systems and Technologies Center of the University of Tehran which was completed with the support of the National Science Foundation of Iran.

Many aviation, civil, and transportation industries use the joints of aluminum sheets to construct sensitive structures. Considering the satellite and electronic industries, loosening of joints has a negative impact on the performance of structures.

“The proposed method in this research is that the desired structure consists of two aluminum sheets and these two sheets are connected to each other using screws, and after the desired boundary conditions are provided, they are placed on the shaker until receiving a certain rate of stimulation,” said Yousefi Kama.

“A piezoelectric transducer is placed on both plates so that during operation, by stimulating one of these transducers, sheet waves are created inside the structure and the wave propagated and passed through the connection is received by the piezoelectric in the second plate,” he added.

This work is done for a large number of shaker excitation frequencies and torque available on the connection, so that a suitable number of data can be collected and after processing them and using a suitable neural network, the state of the connection can be detected,”Yousefi Kama said.

In a relevant development last December, the young specialists of a startup team in Iran had also succeeded in indigenizing a smart platform for the management of big construction projects.

“The idea of designing a smart system for managing construction projects was formed in 2017. This platform is the result of university projects that I decided to indigenize in the country,” Amin Borzouiyan, the head of the startup team, told ANA.

“Smart project management systems, which are called ‘BIM’ or (Building Information Modeling) in the world, did not exist in Iran in such a broad way. In fact, this system includes all stages of construction and control of a construction project (design, construction and operation). A construction engineer needs a supervisor to manage all the details from the beginning to the end. These details include supervision of workers, purchase of materials, drawings and a summary of step-by-step coordination with the client,” he added.

Noting that the platform has been designed for large construction projects with an area of 5,000 meters and it is not useful for general users and the product is mostly ‘B2B’ or (Business to Business), Borzouiyan said, “Our slogan for the platform is ‘Any device, Any Where’, and the user can use this system for his/her project without having any special device and only by connecting to the internet.”

“By using the platform, the user, who is actually the employer of the construction project, fully understands the progress of the work through the data that each person responsible for the project registers in the system. For instance, where did the materials come from and by whom? Or at what stage of work are other parts of the project,” he added.

4155/v