109 Crack Generating Detection Technique of Reinforced Concrete Structure Using Three-Dimensional Measurement Based on Stereo Camera System

2012 ◽  
Vol 2012.11 (0) ◽  
pp. 45-49
Author(s):  
Michio UNEDA ◽  
Mikio TOSHIMA ◽  
Yoshihiko TSUKUDA ◽  
Shin-ichi MIYAZATO ◽  
Ken-ichi ISHIKAWA
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Three Dimensional ◽  
Detection Technique ◽  
Reinforced Concrete Structure ◽  
Camera System ◽  
Stereo Camera ◽  
Dimensional Measurement ◽  
Three Dimensional Measurement

scholarly journals Effect of Catadioptric Component Postposition on Lens Focal Length and Imaging Surface in a Mirror Binocular System

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5309
Author(s):  
Fuqiang Zhou ◽  
Yuanze Chen ◽  
Mingxuan Zhou ◽  
Xiaosong Li
Keyword(s):  
Vision System ◽  
Focal Length ◽  
Three Dimensional ◽  
Length Change ◽  
The Novel ◽  
Camera System ◽  
Dimensional Measurement ◽  
Three Dimensional Measurement ◽  
Lens Focal Length ◽  
Binocular Vision System

The binocular vision system is widely used in three-dimensional measurement, drone navigation, and many other fields. However, due to the high cost, large volume, and inconvenient operation of the two-camera system, it is difficult to meet the weight and load requirements of the UAV system. Therefore, the study of mirror binocular with single camera was carried out. Existing mirror binocular systems place the catadioptric components in front of the lens, which makes the volume of measurement system still large. In this paper, a catadioptric postposition system is designed, which places the prism behind the lens to achieve mirror binocular imaging. The influence of the post prism on the focal length and imaging surface of the optical system is analyzed. The feasibility of post-mirror binocular imaging are verified by experiments, and it is reasonable to compensate the focal length change by changing the back focal plane position. This research laid the foundation for the subsequent research on the 3D reconstruction of the novel mirror binocular system.

Three-Dimensional Measurement of Nostril Positions Based on Stereo-Camera

2013 ◽  
Vol 821-822 ◽  
pp. 1470-1474
Author(s):  
Bo Peng ◽  
Motohiro Kano ◽  
Nobuaki Nakazawa
Keyword(s):  
Skin Color ◽  
Detection System ◽  
Three Dimensional ◽  
Facial Feature ◽  
Feature Point ◽  
Feature Points ◽  
Stereo Camera ◽  
Dimensional Measurement ◽  
Depth Position ◽  
Three Dimensional Measurement

This paper describes the three dimensional measurement of facial feature points. The nostril part was picked up as a feature point. The humans face was observed by the stereo-camera in real time. The depth position of the nostril was derived by the binocular parallax between the detected positions of the two cameras. Here, a new detection method for a nostril was suggested. First of all, the binalization image obtained from the stereo-camera was changed to the connection ingredient by processing labeling. Next, the system narrowed down the candidate of the nostril as a facial feature point by checking the geometric characteristics such as size, the center of gravity every ingredient. Furthermore, the skin color around the nostril was utilized to enhance the detection system.

scholarly journals persamaan empiris waktu getar alami struktur pelat datar beton bertulang berdasarkan hasil analisis vibrasi 3 dimensi

2016 ◽  
Vol 13 (2) ◽  
pp. 116
Author(s):  
Agus Setiawan
Keyword(s):  
Reinforced Concrete ◽  
Flat Plate ◽  
Concrete Structure ◽  
Three Dimensional ◽  
Frame Structure ◽  
Fundamental Period ◽  
Reinforced Concrete Structure ◽  
Base Shear ◽  
Standard Code ◽  
Steel Frame Structure

persamaan empiris waktu getar alami struktur pelat datar beton bertulang berdasarkan hasil analisis vibrasi 3 dimensiEmpirical Formula for Fundamental Period of Flate Plate Reinforced Concrete Structure Based on 3 Dimentional Vibration AnalysisAgus SetiawanJurusan Teknik Sipil, Fakultas Teknik,Universitas Pembangunan Jaya Alamat Korespondensi : BJl. Cendrawasi, Ciputat, Sawah Baru, Tangerangan Selatan, Banten 15413Email : [email protected] of the parameters required in the calculation of seismic base shear on a structure is the fundamental period of the structure. The fundamental period of structure can be obtained through three-dimensional dynamic analysis of the structure. Indonesian Standard Code for Earthquake Resistance Building, SNI 1726-2012, given some empirical equations to calculate the fundamental period ofsome structural system. Some of the given equation can be used for concrete and steel frame structure. However, for the flat plate reinforced concrete structure, sometimes the fundamental period approached as “other structural systems”, which of course can not be shown for accuracy. This study was conducted to obtain an empirical equation that can be used to calculate the fundamental periodof a flat plate structure. The flat plate reinforced concrete structure model being analyzed is vary in total floor number, which varies from 1 to 10 floors, and the width of the building from 20 to 28 meters. From the analysis results obtained relationship between fundamental period, building width and building height in the form Ta = 0,0022(B)’”hn1,15, for the un-cracked section. And Ta = 0,0025(B)’”hn1,28, for the condition of cracked cross-section, with Tn is fundamental period, B is the width of the building plan, and hn is the height of the building.Keywords : Time Period, Flat Plate, Reinforced ConcreteAbstrakSalah satu parameter yang diperlukan dalam perhitungan gaya geser dasar seismik pada suatu struktur adalah besarnya waktu getar alami dari struktur tersebut. Nilai waktu getar alami struktur dapat diperoleh melalui hasil analisis dinamik 3 dimensi dari struktur tersebut. Namun dalam Standar Perencanaan Ketahanan Gempa SNI 1726-2012, juga diberikan beberapa persamaan empiris untuk menghitung waktu getar alami struktur. Beberapa persamaan yang diberikan dapat digunakan untuk sistem struktur rangka beton dan baja. Namun untuk sistem struktur berupa pelat datar (flat plate) beton bertulang, terkadang nilai waktu getarnya didekati sebagai “sistem struktur lainnya”, yang tentu saja tidak dapat ditunjukkan keakuratannya. Penelitian ini dilakukan dengan tujuan untuk mendapatkan persamaan empiris yang dapat digunakan untuk menghitung waktu getar alami suatu struktur pelat datar. Model yang dianalisis berupa struktur pelat datar beton bertulang, dengan jumlah lantai bervariasi dari 1 hingga 10 lantai, serta lebar bangunan dari 20 hingga 28 meter. Dari hasil analisis diperoleh hubungan waktu getar alami dengan lebar bangunan dan tinggi bangunan dalam bentuk Ta = 0,0022(B)’”hn1,15, untuk kondisi penampang utuh. Serta Ta = 0,0025(B)’”hn1,28, untuk kondisi penampang retak, dengan Tn adalah waktu getar alami, B adalah lebar denah bangunan, serta hn adalah tinggi bangunan.Kata kunci : Waktu Getar Alami, Pelat Datar, Beton Bertulang

Sign in / Sign up

Export Citation Format

Share Document