The Research of Infrared Image Generation Method Based on the OGRE

2013 ◽  
Vol 710 ◽  
pp. 623-627
Author(s):  
Cheng Po Mu ◽  
Xian Lei Zhang ◽  
Chao Han ◽  
Ji Yuan Wang
Keyword(s):  
Infrared Radiation ◽  
Geometric Model ◽  
Three Dimensional ◽  
Infrared Image ◽  
Transmission Model ◽  
Three Dimensional Model ◽  
Atmospheric Transmission ◽  
Infrared Thermal Imaging ◽  
Radiation Data ◽  
3D Geometric Model

Infrared thermal imaging technology in various fields has been widely used. This paper firstly sets up the three-dimensional targets infrared radiation models and the atmospheric transmission model, and then generates the associated radiation data; Secondly building target 3D geometric model, the radiation data is mapped to the three-dimensional model, target in the 3D space is reconstructed of the infrared radiation characteristics; Finally it is using OGRE image engine rendering technology and GPU programmable pipeline technology that generate the target infrared image. This will have important significance to the next step to construct complex infrared scene.

Profile Surface Construction and Pressure Angle Analysis of a New Type of Globoidal Indexing Cam

2010 ◽  
Vol 29-32 ◽  
pp. 1608-1614 ◽  
Author(s):  
Lei Li ◽  
Xian Ying Feng ◽  
Zi Ping Zhang ◽  
Xing Chang Han ◽  
Ya Qing Song
Keyword(s):  
Geometric Model ◽  
Three Dimensional ◽  
Surface Equation ◽  
Cam Mechanism ◽  
Pressure Angle ◽  
Three Dimensional Modeling ◽  
Meshing Equation ◽  
New Type ◽  
Three Dimensional Coordinate ◽  
3D Geometric Model

This paper presents a new type of globoidal indexing cam mechanism with steel ball. The characteristic of this mechanism has double circular arc section for cam raceway. Due to this kind of cam raceway section the mechanism can realize approximate rolling transmission. According to rotary transform tensor theory profile surface equation of globoidal cam is established. Meshing equation is built through meshing theory, and profile surface equation is determined by meshing equation. Based on profile surface equation 3D geometric model for globoidal cam is established. MATLAB software is used to calculate three-dimensional coordinate points, these coordinate points are imported into Pro/E software, and finally 3D model for globoidal cam is established by three-dimensional modeling function of Pro/E software. Pressure angle equation of globoidal cam is also established. On the condition that the other parameters remain unchanged the variation law of values of pressure angle depended on cam angle and indexing plate rotary radius is obtained respectively.

scholarly journals Constructing a Computer Model of the Human Eye Based on Tissue Slice Images

2010 ◽  
Vol 2010 ◽  
pp. 1-10 ◽  
Author(s):  
Peishan Dai ◽  
Boliang Wang ◽  
Chunbo Bao ◽  
Ying Ju
Keyword(s):  
Computer Model ◽  
Geometric Model ◽  
Three Dimensional ◽  
Tissue Slice ◽  
Central Axis ◽  
Virtual Surgery ◽  
Three Dimensional Model ◽  
Human Eye ◽  
Eye Tissues

Computer simulation of the biomechanical and biological heat transfer in ophthalmology greatly relies on having a reliable computer model of the human eye. This paper proposes a novel method on the construction of a geometric model of the human eye based on tissue slice images. Slice images were obtained from an in vitro Chinese human eye through an embryo specimen processing methods. A level set algorithm was used to extract contour points of eye tissues while a principle component analysis was used to detect the central axis of the image. The two-dimensional contour was rotated around the central axis to obtain a three-dimensional model of the human eye. Refined geometric models of the cornea, sclera, iris, lens, vitreous, and other eye tissues were then constructed with their position and ratio relationships kept intact. A preliminary study of eye tissue deformation in eye virtual surgery was simulated by a mass-spring model based on the computer models developed.

scholarly journals Research on a Measurement Method for Middle-Infrared Radiation Characteristics of Aircraft

Machines ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 44
Author(s):  
Xuan Deng ◽  
Yueming Wang ◽  
Guicheng Han ◽  
Tianru Xue
Keyword(s):  
Surface Temperature ◽  
Infrared Radiation ◽  
Infrared Camera ◽  
Temperature Inversion ◽  
Flying Height ◽  
Civil Aviation ◽  
Transmission Model ◽  
Atmospheric Transmission ◽  
Observation Distance ◽  
Radiation Characteristics

Aiming at the problem wherein temperature inversion accuracy is unstable due to the major differences in atmospheric transmittance under various observation paths, a method for measuring radiation characteristics of an aircraft engine’s hot parts and skin using a cooled middle-wave infrared camera is proposed. Based on the analysis of the aircraft’s infrared radiation characteristics, the atmospheric transmission model of any observation path was revised, the absolute radiation correction model was established, and the temperature inversion equation was calculated. Then, we used the quasi-Newton method to calculate the skin temperature and discussed uncertainty sources. After the theoretical study, an outfield test was carried out. A middle-wave infrared camera with a wavelength of 3.7–4.8 μm was applied to the actual experimental observation of the turbofan civil aviation aircraft. The ground observation distance was 15 km, and the flying height was 3 km. When implementing temperature inversion with the method presented in this paper, the surface temperature of the aircraft engine hot parts was 381 K, the correction uncertainty was ±10 K, the surface temperature of the skin was 296 K, and the correction uncertainty was ±6 K. As the experiment showed, the method in this paper can effectively implement infrared target temperature inversion and provide a reference for the quantification of infrared data.

scholarly journals The Computational Fluid Dynamics Study of Orientation Effects of Oar Blade

2013 ◽  
Vol 29 (1) ◽  
pp. 23-32 ◽  
Author(s):  
Alexandra Laurent ◽  
Annie Rouard ◽  
Vishveshwar R. Mantha ◽  
Daniel A. Marinho ◽  
Antonio J. Silva ◽  
...  
Keyword(s):  
Flow Direction ◽  
Geometric Model ◽  
Pressure Coefficient ◽  
Angular Position ◽  
Three Dimensional ◽  
Rear Side ◽  
Flow Conditions ◽  
Numerical Resolution ◽  
The Difference ◽  
3D Geometric Model

The distribution of pressure coefficient formed when the fluid contacts with the kayak oar blade is not been studied extensively. The CFD technique was employed to calculate pressure coefficient distribution on the front and rear faces of oar blade resulting from the numerical resolution equations of the flow around the oar blade in the steady flow conditions (4 m/s) for three angular orientations of the oar (45°, 90°, 135°) with main flow. A three-dimensional (3D) geometric model of oar blade was modeled and the kappa-epsilon turbulence model was applied to compute the flow around the oar. The main results reported that, under steady state flow conditions, the drag coefficient (Cd= 2.01 for 4 m/s) at 90° orientation has the similar evolution for the different oar blade orientation to the direction of the flow. This is valid when the orientation of the blade is perpendicular to the direction of the flow. Results indicated that the angle of oar strongly influenced the Cdwith maximum values for 90° angle of the oar. Moreover, the distribution of the pressure is different for the internal and external edges depending upon oar angle. Finally, the difference of negative pressure coefficient Cpin the rear side and the positive Cpin the front side, contributes toward propulsive force. The results indicate that CFD can be considered an interesting new approach for pressure coefficient calculation on kayak oar blade. The CFD approach could be a useful tool to evaluate the effects of different blade designs on the oar forces and consequently on the boat propulsion contributing toward the design improvement in future oar models. The dependence of variation of pressure coefficient on the angular position of oar with respect to flow direction gives valuable dynamic information, which can be used during training for kayak competition.

Numerical Simulation of Instantaneous Wave-Free Ratio of Stenosed Coronary Artery

2019 ◽  
Vol 16 (03) ◽  
pp. 1842009 ◽  
Author(s):  
Wenxin Wang ◽  
Boyan Mao ◽  
Bao Li ◽  
Xi Zhao ◽  
Chensi Xu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Coronary Artery ◽  
Functional Performance ◽  
Geometric Model ◽  
False Positive Rate ◽  
Three Dimensional ◽  
Cost Benefit ◽  
Simulation Method ◽  
Patient Specific ◽  
Three Dimensional Model

Instantaneous wave-free ratio (iFR), an invasive index of coronary artery tree, can evaluate the functional performance of vascular stenosis without pharmacological vasodilators. The noninvasive assessment of diameter stenosis (DS) obtained from coronary computed tomography angiography (CTA) has high false positive rate in contrast to iFR. The aim of this study was to develop a numerical simulation method that predicts the iFR and noninvasively assess the myocardial ischemia. Based on the CTA images, a patient-specific three-dimensional model of the aorta and coronary arteries were reconstructed. A stenosis was created in the left anterior descending artery (LAD) by reducing the DS of geometric model (40%, 50%, 60%, 75% and 90%). The patient-specific LPM boundary condition were set up to compute iFRct value during the wave-free period at the resting condition. The computed pressure and flow of coronary artery were realistic as compared to literature data. In contrast to invasive iFR, the iFRct can make a cost-benefit balance in terms of clinical cost and patient’s health.

3D FEM Simulation of Multipass ECAP Ti-50.8%Ni at Various Temperatures

2014 ◽  
Vol 1004-1005 ◽  
pp. 1204-1210 ◽  
Author(s):  
Mohamed Osman ◽  
Dian Tao Zhang ◽  
Yun Xiang Tong ◽  
Yu Feng Zheng ◽  
Li Li
Keyword(s):  
Geometric Model ◽  
Three Dimensional ◽  
Fem Simulation ◽  
3D Fem ◽  
Remarkable Effect ◽  
Fine Grained ◽  
Angular Pressing ◽  
3D Geometric Model ◽  
3D Software ◽  
Deformation Homogeneity

Equal channel angular pressing (ECAP) is widely studied for its potential to produce ultra-fine grained (UFG) structure in TiNi shape memory alloys (SMA). In the present work, the effect of multipass ECAP parameters on the deformation behavior and strain distribution was investigated, at various deformation temperatures through different planes in the ECAPed billet. Three-dimensional (3D) geometric model with corner angle 120◦was designed by finite element method (FEM) software for ECAPing Ti-50.8%Ni by route Bcin DEFORM-3D software. Two methods were used to quantify deformation homogeneity through various planes in the processed billet, including strain standard deviation (SSD) and inhomogenity index (Ci). The simulation results demonstrate that by increasing ECAP passes, the cumulative average strain can increase and obtain UFG structure, but heterogeneity still exist across planes. In addition, temperature has a remarkable effect on homogeneity distribution .As well as Ciexhibits good results for multipass ECAP at various deformation temperature compared to SSD value.

Infrared Image Simulation of Ground Maneuver Target and Scene Based on OGRE

2014 ◽  
Vol 716-717 ◽  
pp. 932-935
Author(s):  
Cheng Po Mu ◽  
Ming Song Peng ◽  
Qing Xian Dong ◽  
Xiang Gao ◽  
Rui Heng Zhang
Keyword(s):  
Experimental Data ◽  
Infrared Radiation ◽  
Infrared Image ◽  
Image Simulation ◽  
Radiation Characteristics ◽  
Radiation Model ◽  
Scene Simulation ◽  
Radiation Data ◽  
Modeling Software ◽  
Specific Experiment

Infrared scene simulation has extensive application value in military and civil fields. According to the specific experiment environment, this paper simulation of an infrared scene and according to the experimental data produced infrared texture library. First of all, through the 3Dmax modeling software to establish the target infrared radiation model, and calculate the relevant radiation data of it. Then analyze the radiation characteristics of the relevant materials, the establishment of infrared texture library for each material. And finally, use OGRE engine image rendering technology and GPU programmable pipeline technique to simulate a complex infrared scene close to the real.

Manufacturing Process and Geometric Model of Porous Metal Fiber Sintered Felts

2012 ◽  
Vol 499 ◽  
pp. 235-240
Author(s):  
Wei Zhou ◽  
R. Song ◽  
Y. Tang ◽  
Z.P. Wan ◽  
B. Liu
Keyword(s):  
Cell Structure ◽  
Geometric Model ◽  
Three Dimensional ◽  
Porous Metal ◽  
Structure Characteristic ◽  
Test Results ◽  
Dimensional Model ◽  
Metal Fiber ◽  
Three Dimensional Model ◽  
Pore Cell

Using the designed multi-tooth tool, a novel porous metal fiber sintered felt (PMFSF) with three-dimensional reticulated structure has been produced by solid-state sintering of copper fibers. The copper fibers were fabricated using the cutting method. According to the SEM results, it was found that there were two kinds of sintering joints of surface contact and crossing fiber meshing among the fibers in the PMFSF. The coarser sintering joints will help to enhance the mechanical strength of PMFSF. Based on the structure characteristic, a three-dimensional model with the cubic pore cell structure was established to describe the structure of PMFSF. In addition, the effectiveness of geometric model was verified by the test results of specific surface area of PMFSF.

scholarly journals A SINGLE-PASS AIRBORNE INTERFEROMETRIC CALIBRATION METHOD RESEARCH FOR DEM MAPPING

2020 ◽  
Vol XLIII-B1-2020 ◽  
pp. 331-336
Author(s):  
L. J. Lu ◽  
G. M. Huang
Keyword(s):  
Geometric Model ◽  
Three Dimensional ◽  
Optimization Procedure ◽  
Real Data ◽  
Calibration Method ◽  
Baseline Length ◽  
Three Dimensional Model ◽  
Single Pass ◽  
Digital Elevation ◽  
Elevation Model

Abstract. This paper presents a novel single-pass airborne interferometric calibration method with a limited Number GCPs for InSAR digital elevation model (DEM) mapping. The proposed method is based on a rigorous three-dimensional model for a single-pass airborne InSAR system. The corrected InSAR parameters of baseline length, baseline inclination, near slant range, and Doppler centroid frequency, as well as phase offset, can be jointly solved via a unified optimization procedure in terms of the constructed three-dimensional geometric model using a limited number ground control points (GCPs). The proposed method is evaluated on real data of the CASMSAR system in X-band, the final DEMs generated by the calibration processing achieve a high accuracy level (1–3 m standard deviation), even in the presence of only 3–5 GCPs.

scholarly journals Simulation of an S-Band MILO with Adjustable Beam Dump

Plasma ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 138-155 ◽  
Author(s):  
Matthew Abide ◽  
James Dickens ◽  
Ravi P. Joshi ◽  
Andreas Neuber ◽  
John Mankowski
Keyword(s):  
Model Simulation ◽  
Geometric Model ◽  
Three Dimensional ◽  
High Repetition Rate ◽  
Marx Generator ◽  
Three Dimensional Model ◽  
Peak Voltage ◽  
Band Frequency ◽  
Simulation And Optimization ◽  
Peak Output Power

This paper details the design, simulation, and optimization of a low-impedance high repetition rate magnetically insulated transmission line oscillator (MILO) driven by a compact Marx generator. The project goals require the MILO to generate an radio frequency (RF) pulse within the S-band frequency range with a peak output power greater than 1 GW with greater than 10% efficiency. Its design is based on a set of base equation which provide critical component dimensions applied to a three-dimensional model constructed within CST studio suite used in a particle-in-cell (PIC) simulation. Additional to the geometric model, simulation of the MILO with non-ideal material properties and a lumped element modeling of the Marx generator were performed. The results of these simulations then informed changes to the model as to the optimizing performance of the device. Within the framework of the model, the final MILO design achieves the design goals with an approximate RF peak power of 4.5 GW at 2.5 GHz operating in the TM 01 mode when an input driving pulse with a peak voltage of 600 kV while providing 58 kA is applied.

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