scholarly journals Multi-Monostatic Interferometric Radar with Radar Link for Bridge Monitoring

Electronics ◽  
2021 ◽  
Vol 10 (22) ◽  
pp. 2777
Author(s):  
Lapo Miccinesi ◽  
Massimiliano Pieraccini ◽  
Alessandra Beni ◽  
Ovidiu Andries ◽  
Tommaso Consumi
Keyword(s):  
Opposite Direction ◽  
Displacement Component ◽  
Mimo Radar ◽  
Dynamic Monitoring ◽  
Engineering Practice ◽  
Radio Link ◽  
Large Structure ◽  
Bridge Monitoring

In recent years, interferometric radars have been extensively used as sensors for static and dynamic monitoring of bridges. Generally speaking, a radar can only detect the displacement component along its view direction. As the movement of a real bridge or a large structure can be rather complex, this limitation can be a significant drawback in engineering practice. In order toovercome this limitation, in this article, a multi-monostatic interferometric radar with radio link is proposed. This radar is able to detect a second component of displacement using a transponder. The transponder is connected to the radar through a radio link. The radio link allows the installation of the transponder far away from the radar, and even in the opposite direction. The equipment is based on a MIMO radar, two transceivers for the radio link, and a transponder. The transceivers and the transponder are essentially two antennas and an amplifier system. The equipment is experimentally tested in controlled scenarios and in the case study of Indiano Bridge, Florence, Italy.

scholarly journals Multi-Monostatic Interferometric Radar for Bridge Monitoring

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 247
Author(s):  
Lapo Miccinesi ◽  
Alessandra Beni ◽  
Massimiliano Pieraccini
Keyword(s):  
Displacement Vector ◽  
Multiple Input Multiple Output ◽  
Simultaneous Detection ◽  
Dynamic Monitoring ◽  
Engineering Practice ◽  
Bridge Monitoring ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Bridge Crossing ◽  
Pair Of Antennae

In recent years, interferometric radar has been extensively used as a sensor for static and dynamic monitoring of bridges. Generally speaking, a radar can only detect displacement components along the view direction. As the movement of a real bridge or of a large structure can be rather complex, this limitation can be a significant drawback in engineering practice. In order to overcome this limitation, in this article, a multi-monostatic radar for retrieving the displacement vector is proposed. It is basically a multiple input, multiple output (MIMO) interferometric radar, equipped with a transponder that consists of a pair of antennae, with relative amplifiers, connected to the radar with a radiofrequency (RF) cable. This arrangement allows for the simultaneous detection of two independent displacement components. The radar was successfully tested both in a controlled environment and in the field on a real bridge crossing the Arno river in Florence, Italy.

scholarly journals Monitoring and Analysis of Dynamic Characteristics of Super High-rise Buildings using GB-RAR: A Case Study of the WGC under Construction, China

2020 ◽  
Vol 10 (3) ◽  
pp. 808 ◽  
Author(s):  
Lv Zhou ◽  
Jiming Guo ◽  
Xuelin Wen ◽  
Jun Ma ◽  
Fei Yang ◽  
...  
Keyword(s):  
Wavelet Analysis ◽  
Dynamic Characteristics ◽  
Horizontal Displacement ◽  
Dynamic Monitoring ◽  
High Rise ◽  
The North ◽  
Study Results ◽  
Under Construction ◽  
East West

Accurate dynamic characteristics of super high-rise buildings serve as a guide in their construction and operation. Ground-based real aperture radar (GB-RAR) techniques have been applied in monitoring and analyzing the dynamic characteristics of different buildings, but only few studies have utilized them to derive the dynamic characteristics of super high-rise buildings, especially those higher than 400 m and under construction. In this study, we proposed a set of technical methods for monitoring and analyzing the dynamic characteristics of super high-rise buildings based on GB-RAR and wavelet analysis. A case study was conducted on the monitoring and analysis of the dynamic characteristics of the Wuhan Greenland Center (WGC) under construction (5–7 July 2017) with a 636 m design height. Displacement time series was accurately derived through GB-RAR and wavelet analysis, and the accuracy reached the submillimeter level. The maximum horizontal displacement amplitudes at the top of the building in the north–south and east–west directions were 18.84 and 15.94 mm, respectively. The roof displacement trajectory of the WGC was clearly identified. A certain negative correlation between the temperature and displacement changes at the roof of the building was identified. Study results demonstrate that the proposed method is effective for the dynamic monitoring and analysis of super high-rise buildings with noninvasive and nondestructive characteristics.

Service Elicitation Method Using Applied Qualitative Research Procedures

2011 ◽  
pp. 1-17 ◽  
Author(s):  
Ville Alkkiomäki ◽  
Kari Smolander
Keyword(s):  
Qualitative Research ◽  
Research Method ◽  
Systems Development ◽  
Engineering Practice ◽  
Use Case ◽  
Elicitation Method ◽  
Grounded Theory Research ◽  
Service Oriented ◽  
Theory Research

This chapter introduces QSE, the Qualitative Service Elicitation method. It applies qualitative research procedures in service elicitation. Service engineering practice lacks lightweight methods to identify service candidates in projects with tight schedules. QSE provides a systematic method to analyze requirement material in service-oriented systems development with a feasible effort. QSE uses the procedures of the grounded theory research method to elicit service candidates from business process descriptions and business use case descriptions. The chapter describes the method with examples and a case study.

scholarly journals From Academia to Start-up: A Case Study with Implications for Engineering Education

2014 ◽  
Vol 4 (1) ◽  
pp. 24
Author(s):  
Bill Williams ◽  
José Figueiredo
Keyword(s):  
Knowledge Production ◽  
Critical Analysis ◽  
Qualitative Data ◽  
Engineering Students ◽  
Role Play ◽  
Engineering Practice ◽  
Start Up ◽  
Mode 2

This study uses the characterization of contrasting modes of knowledge production to follow the activity of a group of engineers who migrated from an academic environment to a successful start-up firm. Qualitative data from interviews of two key members of the team were used to characterize their activities in the two settings. The authors relate the engineering practice described in the interviews to the Gibbons Mode 1 and Mode 2 knowledge production phases and note the importance of a phase change in the transition between the two modes. The resultant case-study contributes material for use in role-play activity with engineering students to help develop interdisciplinary skills. The study also presents a critical analysis to evaluate the merits of the Mode 1 and Mode 2 framework for analysis of engineering practice at the level of the firm.

scholarly journals Contact-Induced Change in an Oceanic Language: The Paluai – Tok Pisin Case

2017 ◽  
Vol 10 (1) ◽  
pp. 76-97 ◽  
Author(s):  
Dineke Schokkin
Keyword(s):  
Papua New Guinea ◽  
Opposite Direction ◽  
Language Contact ◽  
Semantic Category ◽  
Processes Of Change ◽  
Functional Elements ◽  
Semantic Categories ◽  
Creole Languages ◽  
Substrate Influence

Many studies have focused on substrate influence on the creole languages of Melanesia – Tok Pisin, Solomons Pijin and Bislama. The same cannot be said with regard to influence in the opposite direction: contact-induced change occurring in local vernaculars due to pressure from the creole. This paper presents a case study of several instances of structural borrowing and semantic category change in Paluai, an Oceanic language spoken in Papua New Guinea. It is shown that a number of functional elements originating from Tok Pisin are now firmly embedded in Paluai grammar: two verbs, gat and inap, and a conjunction, taim. Moreover, semantic categories are undergoing change and possibly attrition due to many-to-one correspondences. This suggests that it is important to view language contact situations as dynamic and involving two-way processes of change.

scholarly journals Application of Basis Functions for Hull Form Surface Modification

2021 ◽  
Vol 9 (9) ◽  
pp. 1005
Author(s):  
Baiwei Feng ◽  
Chengsheng Zhan ◽  
Zuyuan Liu ◽  
Xide Cheng ◽  
Haichao Chang
Keyword(s):  
Surface Modification ◽  
Resistance Coefficient ◽  
Original Model ◽  
Basis Functions ◽  
Engineering Practice ◽  
Total Resistance ◽  
Hull Form ◽  
Modification Method ◽  
Selection Of

Basis functions are key in constructing interpolation equations in hull surface modification based on radial basis functions (RBF) interpolation. However, few have studied the selection of basis functions in depth. By comparing several typical basis functions through a theoretical analysis and two-dimensional modification examples, the Wendland ψ3,1 (W) function is selected. The advantages of hull form surface modification based on W function interpolation are further validated through a case study. Finally, the modification method is used to optimize a trimaran model. An optimal hull form with fair lines is obtained, and its wave-making resistance coefficient and total resistance are reduced by 8.3% and 3.8%, respectively, compared to those of the original model. These findings not only further illustrate that the W function is relatively suitable for hull form surface modification, but also validate the feasibility and value of the RBF interpolation-based surface modification method in engineering practice.

scholarly journals A business case for risk-informed bridge monitoring using the value of information

2021 ◽  
Author(s):  
Manu Sasidharan ◽  
Ajith Kumar Parlikad ◽  
Jennifer Schooling
Keyword(s):  
Value Of Information ◽  
Business Case ◽  
Illustrative Case ◽  
Maintenance Strategies ◽  
Bridge Monitoring ◽  
Monitoring Strategies ◽  
Business Cases ◽  
Illustrative Case Study ◽  
The Uk

<p>While the benefits of monitoring bridges are fairly understood, securing the resources necessary for their development and installation is often difficult. The premise of the article is that infrastructure owners will take action to provide those resources when they can see value accruing to them; therefore narratives around value generation and business cases are required to motivate and support that action. This paper explores the application of the value of information methodology to the challenge of developing a business case for bridge monitoring using an illustrative case study on a simulacrum of a road bridge in the UK. To this end, this paper presents a systematic approach for setting risk-informed bridge monitoring strategies while considering the reliability and accuracy of data capture offered by different monitoring techniques and the gains to be made downstream if it contributes to setting timely maintenance strategies.</p>

An Interferometric MIMO Radar for Bridge Monitoring

2019 ◽  
Vol 16 (9) ◽  
pp. 1383-1387 ◽  
Author(s):  
Massimiliano Pieraccini ◽  
Lapo Miccinesi
Keyword(s):  
Mimo Radar ◽  
Bridge Monitoring
Sign in / Sign up

Export Citation Format

Share Document