J'ai entendu parler des "bridges" En cherchant à s'équiper d'un appareil photo numérique, il est possible de voir passer ici ou là ce que l'on appelle un appareil photo bridge. The natural frequencies extracted from PSD of angle measurements are compared with the previous ones measured by the reference accelerometers. Les appareils photos compact ont trois avantages : 1. The excellent agreement is observed between the frequency values obtained by the reference accelerometers and smartphones at different measuring points, with a maximum error of 0.44%. Si un bon smartphone peut être une alternative suffisante pour partir en voyage, un bridge de qualité permet la plupart du temps d’effecteur des vidéos en 4K soit full HD. Since the sampling rate of the smartphone for displacement monitoring (30 Hz) is different with the reference one (100 Hz), the plots of comparisons in time domain are enlarged (between 4 s and 5 s) to show more details. Le module d’initiation au bridge Découvrez les règles du bridge et les notions essentielles du jeu grâce aux cours et exercices élaborés par nos experts du bridge. Again, the satisfactory agreement is observed between the frequency values obtained by the reference sensor and smartphone. Note: If the language displayed from the installation is incorrect, click Settings on the top right and select the correct language from the drop down. Both of smartphones collect the vibration data of the cable simultaneously under the artificial excitation for one minute. As the experiment object, a concrete self-anchored suspension bridge model, which is designed and constructed with 1/28 scale of Zhuanghe Construction Bridge located in Zhuanghe city of China shown in Figure 9, is selected in the Bridge Lab of Dalian University of Technology. The scale bridge model and the layout of the smartphone and sensors are shown in Figure 11. All of the four smartphones used in experiment are iPhone 6 with a three-axis Bosch BMA280 accelerometer [27], a three-axis InvenSense MPU-6500 accelerometer, and a three-axis InvenSense MPU-6500 gyroscope [28]. Livraison rapide de votre Appareil photo compact ou bridge ou … As mentioned before, the structural static and dynamic displacements can be obtained easily by recognizing the movement of not only a laser spot but also a black circle target, by means of smartphone camera. Table 2 summarizes the frequency difference and cable force identified by two methods. Prix d'achat d'un Wi-Fi Bridge … Orion-CC is a valuable tool for an actual application of Structural Health Monitoring (SHM) because the cable force measuring method by Orion-CC has many advantages over other measuring methods, such as economy, convenience, and ease of operation. Click the LG Backup tab, Ensure your phone is connected to the computer and click Back Up. Cimellaro et al. Tests results demonstrated that the measurement accuracy of smartphones mainly depends on the type of vibration, the vibration directions, and the installation manner. As can be seen from Table 2, the cable forces obtained by D-Viewer and Orion-CC are highly comparable, with significantly small error of less than 1.1%. As mentioned before, the dynamic responses of acceleration and angle in the vibration of structure can be obtained by the application Orion-CC using the smartphone-embedded accelerometer and gyroscope, and also the dynamic displacement response of the structure can be extracted by recognizing the movement of the laser spot shot on the projection plate by means of the application D-Viewer using smartphone camera. Wait for the restore process to complete. Figure 19 plots the displacement time history responses, comparisons in time domain, and the corresponding PSD obtained from smartphone 4 and the laser displacement sensor at mid span of the bridge model. LG Bridge brings all your LG devices (phones and tablets) together. The experiment results show that there is a good agreement between the reference sensor and smartphone measurements in both time and frequency domains. First, the vision-based cable force measurement method was proposed in this paper, and then the comparison test was conducted on the cable model to verify the feasibility of proposed method. When an extreme disaster occurs, the rapid damage detection of bridges will be helpful for the quick evaluation of transportation networks for the emergency response [7]. [8] proposed a new idea for mobile SHM using smartphone built-in sensors or external sensors board for the first time, carried out preliminary test to validate its feasibility and implementation, and then mentioned that mobile SHM system based on public participant under emergency condition is possible because of its features such as low cost and popularization. Ils sont pratiques 3. NEWS : Compacts & bridge… Un large choix à partir de 99€. Xuefeng Zhao, Kwang Ri, Ruicong Han, Yan Yu, Mingchu Li, Jinping Ou, "Experimental Research on Quick Structural Health Monitoring Technique for Bridges Using Smartphone", Advances in Materials Science and Engineering, vol. As shown in figures, although the vibration amplitudes and PSD peak values are different due to the differences of sampling rate, measuring position, and measuring item, it is observed that the same frequency components can be accurately obtained by the different methods from both of smartphone applications. SnapBridge vous permet d’utiliser votre smartphone ou votre tablette pour prendre des photos à distance. Comparez et achetez votre Appareil photo compact ou bridge parmi 57 références et 7 marques (Panasonic, Canon, Nikon...). Ils sont petits 2. Accédez facilement aux commandes principales de l’appareil photo via … Votre appareil photo (ou votre smartphone) n’a peut-être pas le bras assez long pour capturer vos sujets préférés, comme les oiseaux dans un nid, les avions, ou … [12] developed multiple platforms including smartphones and Internet for rapid building damage assessment after a seismic event, which collected photos of damaged houses taken by residents or volunteers in damaged area as the first emergency response information. In this study, a comprehensive experiment research, including cable force test and bridge model test, was carried out to verify the feasibility of the quick bridge health monitoring technique using smartphone. The distance between smartphone and cable model is adjusted using the tripod according to the size of panel in order to ensure a whole white background. The natural frequency is identified as 4.58, 4.56, and 4.57 Hz, respectively, at three different measuring points by three reference accelerometers. Livraison rapide de votre Appareil photo compact ou bridge ou retrait en Yu et al. Un large choix à partir de 139€. First, one novel cable force measurement method is proposed, which enables the estimation of cable force based on the recognition for cable vibration using smartphone camera. Son limpide, interprètes de qualité. Based on this fact, the cable force test on the model cable is conducted in order to investigate the feasibility of a novel vision-based cable force measuring method using smartphone. A sheet of A4 white paper, on which a black circle of 25 mm in diameter is preprinted, is attached to projection plate, and then the calibration is conducted in the initial setup interface for measuring. JavaScript appears to be disabled in your browser. In general, as the position at which smartphone is mounted is relatively low compared with the length of cable, the first peak in the corresponding PSD obtained by the vibration measurement of cable is not very clear, and thus it is usually difficult to identify the natural frequency of the first vibration mode for estimating cable force by the application Orion-CC using smartphone built-in accelerometer. Android device (version 2.3) recorded acceleration data of shaking table with a sampling rate of 27 Hz under excitations of different frequencies. Although the SHM system installed on bridge provides real-time information for damage assessment after a disaster, not all bridges have been installed with the SHM system. Since the focus of this test is on the verification of feasibility of cable force measurement method using smartphone camera, the vibration data of the model cable acquired by Orion-CC and D-Viewer is analyzed using MATLAB. Sharma and Gupta [11] studied the use of smartphone in civil engineering and measured various field parameters including absolute location, distance, area, and perimeter using smartphone GPS receiver and also evaluated noise pollution using microphone of smartphone. LG Bridge brings all your LG devices (phones and tablets) together. [16] studied the utilization of accelerometers embedded in smartphone for measuring different types of vibration and validated its capability for SHM through vibration response test on a reinforced concrete pedestrian bridge. As can be seen in Figure 19(c), although the sampling rates are different, the displacement response time histories agree well with one another. [15] and Ozer et al. Bridge: Chez Canon, le SX540 HS, chez Panasonic, le Lumix DMC-FZ28 ou chez Fujifilm, le FinePix SL240-> trois bridges très bien notés (mais plus encombrants) et présentant un plus long zoom optique qu’un compact. A noticeable difference exists between the mid span and quarter span in terms of amplitude. The peak responses are obtained as 0.38 g (left), 0.64 g (mid), and 0.29 g (right) by smartphones, respectively. Forced vibrations induced on the Wilford Suspension bridge. Present SHM systems have been mainly installed on some of large-scale structures or major construction projects with great significance [6], such as long-span bridges, due to the financial problems and practical difficulties associated with instrumentation and monitoring. The test result demonstrated the feasibility and accuracy of vision-based cable force measurement using smartphone, with significantly small error of less than 1.1%. Experimental Research on Quick Structural Health Monitoring Technique for Bridges Using Smartphone, School of Civil Engineering, Dalian University of Technology, Dalian 116024, China, State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China, Research Center of Structural Smartphone Cloud Monitoring, Dalian University of Technology, Dalian 116024, China, School of Civil Engineering, Pyongyang University of Architecture, Pyongyang 1001, Democratic People’s Republic of Korea, School of Electronic Science and Technique, Dalian University of Technology, Dalian 116000, China, School of Software Technology, Dalian University of Technology, Dalian 116000, China, School of Civil Engineering, Harbin Institute of Technology, Harbin 150000, China, Advances in Materials Science and Engineering, https://itunes.apple.com/cn/app/orion-cc/id951253417?mt=8, https://itunes.apple.com/cn/app/d-viewer/id1006583231?mt=8, https://www.bosch-sensortec.com/bst/products/all_products/bma280/, http://www.invensense.com/products/motion-tracking/6-axis/mpu-6500/, 1080 p HD video recording (30 fps or 60 fps), J. 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Sharma and D. Gupta, “Smartphone as a real-time and participatory data collection tool for civil engineers,”, G. P. Cimellaro, G. Scura, C. S. Renschler, A. M. Reinhorn, and H. U. Kim, “Rapid building damage assessment system using mobile phone technology,”, R. Han, X. Zhao, Y. Yu, and J. Ou, “Design and initial validation of mobile-structural health monitoring system based on smart phone,” in, Y. Yu, X. Zhao, R. Han, and J. Ou, “Design and initial validation of external sensors board of smart phones for mobile structural health monitoring system,” in, M. Feng, Y. Fukuda, M. Mizuta, and E. Ozer, “Citizen sensors for SHM: use of accelerometer data from smartphones,”, E. Ozer, M. Q. Feng, and D. Feng, “Citizen sensors for SHM: towards a crowdsourcing platform,”, H. Tan and J. Chen, “Experiment verification of mobile phones for vibration measurement,” in, X. Zhao, H. Liu, Y. Yu et al., “Convenient displacement monitoring technique using smartphone,”, R. Han, X. Zhao, and Y. 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