Calculation Method for Rocking Die Motion Track in Cold Orbital Forging

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Xinghui Han ◽  
Xinchang Zhang ◽  
Lin Hua
Keyword(s):  
Experimental Study ◽  
Case Studies ◽  
Analytical Model ◽  
Calculation Method ◽  
Universal Motion ◽  
Orbital Forging ◽  
Geometry And Kinematics

In cold orbital forging, the rocking die performs complex motions on the components and the intervention between them cannot emerge, otherwise the components cannot be shaped successfully. Calculating the rocking die motion track is essential to determining whether there is intervention between the rocking die and components. Thus, this study aims to comprehensively investigate the rocking die motion track in cold orbital forging. For this purpose, an analytical model for calculating the rocking die motion track is first established. Then a universal motion track equation that can denote any geometry and kinematics relationships between the rocking die and components is obtained using this analytical model. To verify the validity of this motion track equation, an experimental study is conducted. The result shows that the calculated rocking die motion track is consistent with the experimental one. According to this valid motion track equation, the characteristics of the rocking die motion track are revealed. Finally, to apply the calculated rocking die motion track for analyzing the intervention between the rocking die and components, two case studies are examined.

Framing referendum campaigns in the media: towards a frame-building model

2018 ◽  
pp. 130-147
Author(s):  
Marina Dekavalla
Keyword(s):  
Case Studies ◽  
Analytical Model ◽  
Media Framing ◽  
The Other ◽  
Political Event ◽  
Building Model ◽  
Frame Building ◽  
The Media ◽  
Media Systems

Chapter 7 proposes an explorative frame-building model for referendum campaigns to help explain how the media cover referendums in particular media systems. It compares insights from the previous chapters with those from other framing studies in different contexts and discusses the extent to which certain frames may be expected to emerge in the coverage of referendum campaigns in general, as a broader category of political event. Comparisons are drawn to research focusing on the 1980 Quebec independence referendum, the 2000 Euro referendum in Denmark and the 2008 Swiss direct-democratic consultation on immigration, which are the other case studies where media framing studies have been carried out. The chapter identifies connections between the similarities these cases share and the characteristics of the media systems where they are located. These similarities form the basis of the original analytical model proposed here.

scholarly journals Theoretical and Experimental Study of Heterodyne Phase-Sensitive Dispersion Spectroscopy with an Injection-Current-Modulated Quantum Cascade Laser

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6176
Author(s):  
Zhen Wang ◽  
Kin-Pang Cheong ◽  
Mingsheng Li ◽  
Qiang Wang ◽  
Wei Ren
Keyword(s):  
Experimental Study ◽  
Analytical Model ◽  
Quantum Cascade Laser ◽  
Near Infrared ◽  
Optical Modulator ◽  
Line Center ◽  
Mid Infrared ◽  
Quantum Cascade ◽  
Electro Optical Modulator ◽  
Phase Sensitive

We report the theoretical and experimental study of calibration-free heterodyne phase-sensitive dispersion spectroscopy (HPSDS) in the mid-infrared using a direct current modulated mid-infrared quantum cascade laser (QCL). The modulation of QCL current at several hundred MHz or higher generates the synchronous frequency and intensity modulation of the QCL emission. An analytical model of the phase of the beat note signal in HPSDS is derived by considering the absorption and dispersion processes and incorporating the QCL modulation parameters. In the experiment, a 4.5 μm QCL modulated at 350 MHz was used to measure N2O at 200 Torr in a 10 cm gas cell. The N2O concentrations inferred from the analytical model were compared with the nominal values to show good agreement over the concentration range of 189−805 ppm with a standard deviation <3%. When the QCL wavelength was locked at the line-center of the molecular transition, it was of interest to find that the theoretical model was simplified to that used for near-infrared HPSDS with an electro-optical modulator for laser modulation.

Modeling and electromechanical performance analysis of frequency-variable piezoelectric stack transducers

2020 ◽  
Vol 31 (6) ◽  
pp. 897-910
Author(s):  
Jianjun Wang ◽  
Shuyuan Cai ◽  
Lei Qin ◽  
Donghuan Liu ◽  
Peijun Wei ◽  
...  
Keyword(s):  
Experimental Study ◽  
Performance Analysis ◽  
Analytical Solution ◽  
Resonance Frequency ◽  
Analytical Model ◽  
Dynamic Characteristics ◽  
Active Element ◽  
Underwater Sound ◽  
Layer Number ◽  
Electromechanical Performance

An exact analytical model of frequency-variable piezoelectric stack transducers is proposed, and their dynamic characteristics are studied in this article. Based on the linear piezoelasticity theory, the dynamic analytical solution is first derived, and then its correctness is validated by comparing it with the results of a special example in the previous literature and the ones of the experimental study. The effects of the tuning resistance and the layer number of the active element on the dynamic characteristics are discussed. Numerical results show that tuning the resistance and the layer number of the active element can enable the multi-frequency characteristics of the piezoelectric stack transducers. A proper layer number of the active element can minimize the short-circuited resonance frequency and the open-circuited anti-resonance frequency. These findings provide guidelines to design and optimize the piezoelectric stack transducers, which have promising potential in developing the multi-frequency Langevin transducers for some underwater sound and ultrasonic applications, such as ultrasonic cleaning, ultrasonic chemistry, and sonar radiators.

Experimental study on calculation method of the radiant time factors

2015 ◽  
Vol 73 ◽  
pp. 28-35 ◽  
Author(s):  
Liugen Lv ◽  
Chen Huang ◽  
Li Li ◽  
Jianchang Chen
Keyword(s):  
Experimental Study ◽  
Calculation Method ◽  
Time Factors

scholarly journals Four types of urban austerity: Public land privatisations in French and Italian cities

Urban Studies ◽  
2019 ◽  
Vol 57 (1) ◽  
pp. 75-92 ◽  
Author(s):  
Félix Adisson ◽  
Francesca Artioli
Keyword(s):  
Case Studies ◽  
Analytical Model ◽  
Ad Hoc ◽  
Public Land ◽  
Routine Practice ◽  
Local Policy ◽  
Policy Capacity ◽  
Different Types ◽  
Local Patterns

This article contributes to current debates on urban austerity by comparing public land privatisations in French and Italian cities. These privatisations have emerged in several countries during the last two decades as a recurring austerity measure. However, current research does not explain how similar national austerity policies result in diverse urban outcomes. This article tackles this limitation by developing an analytical model of the different types of urban austerity. It uses the intergovernmental system and local policy capacity as the main variables to explain four local patterns of austerity, that is, gridlock austerity, nationally mitigated austerity, locally mitigated austerity and opportunistic austerity. Drawing on nine case studies covering two public landowners, the article shows that public land austerity policies have become routine practice based on compromises in French cities, but conflictual and based on ad hoc solutions in Italian cities.

Experimental study and analytical model of deformation of magnetostrictive films as applied to mirrors for x-ray space telescopes

2014 ◽  
Vol 53 (27) ◽  
pp. 6256 ◽  
Author(s):  
Xiaoli Wang ◽  
Peter Knapp ◽  
S. Vaynman ◽  
M. E. Graham ◽  
Jian Cao ◽  
...  
Keyword(s):  
Experimental Study ◽  
Analytical Model ◽  
Space Telescopes ◽  
X Ray

Allowable Height Difference between Adjacent Monoliths with Spherical Surface Key Groove in Transverse Joints

2013 ◽  
Vol 438-439 ◽  
pp. 624-628
Author(s):  
Dan Ni Luo ◽  
Yu Hu ◽  
Qin Bing Li
Keyword(s):  
Analytical Model ◽  
Calculation Method ◽  
Spherical Surface ◽  
Arch Dam ◽  
Volume Deformation ◽  
Height Difference ◽  
Computation Theory ◽  
Main Factors ◽  
Vertical Deformations

The calculation method of the minimum aperture of transverse joints with spherical surface key groove was introduced in this study. Based on the computation theory of allowable height difference between adjacent monoliths proposed by Bofang Zhu, the analytical model of allowable height difference of Xiluodu arch dam was established with consideration of the effect of main factors on the transverse joints deformation, including the temperature, autogenous volume deformation, self-weight and foundation. After the horizontal and vertical deformations of transverse joints was required, according to the form of spherical surface key groove, the aperture of each part of key groove and the minimum aperture were obtained at several height difference between adjacent monoliths. The allowable height difference was determined on the condition of meeting the grouting requirements of transverse joints. The result shows that the allowable height difference for Xiluodu arch dam should not be more than 30m.

scholarly journals Experimental study of the behaviour of the crosstalk of shielded or untwisted-pair cables in high frequency

2019 ◽  
Vol 16 (3) ◽  
pp. 311-324
Author(s):  
Benazza Baghdadi ◽  
Bendaoud Abdelber ◽  
Reineix Alain ◽  
Dafif Omar ◽  
Slimani Helima
Keyword(s):  
Experimental Study ◽  
Case Studies ◽  
High Frequency ◽  
Complete System ◽  
Electronic Systems ◽  
Natural Phenomena ◽  
Industrial Activity ◽  
Common Mode ◽  
Network Analyser ◽  
Electromagnetic Disturbances

Electromagnetic disturbances from natural phenomena such as lightning, or those generated from industrial activity, can cause harmful interference in onboard electronic systems. The disturbances are generally transformed into radiated and conducted disturbances, using wired connections to spread their effects in electrical and electronic systems. In order to identify the paths of propagation and coupling of these HF currents into a complete system and propose solutions to reduce EMC interference, it is necessary and important to carry out experimental case studies on the coupling between shielded as well as unarmoured cables, in order to identify the importance of differential and common-mode currents. Measurements were made using a 4-way vector network analyser giving the results of the crosstalk between victim and culprit cables as well as for module and phase.

Research on the Calculation Method of Tightening Torque on P-110S Threaded Connections

2011 ◽  
Vol 133 (5) ◽  
Author(s):  
Shou-Jun Chen ◽  
Qi An ◽  
Yi Zhang ◽  
Qiang Li
Keyword(s):  
Analytical Model ◽  
Calculation Method ◽  
Geometric Parameters ◽  
New Method ◽  
Frictional Torque ◽  
Element Analysis ◽  
Tightening Torque ◽  
Threaded Connection ◽  
Threaded Connections ◽  
Elastic Mechanics

Tightening torque is one of the main factors that could affect the connection quality in threaded connections. On the basis of elastic mechanics and thick cylinder theory, this paper established a new analytical model based on the geometric parameters of thread tooth and the calculation method of tightening torque on P-110S threaded connections was also obtained by calculating the frictional torque on each threaded surface. In this paper, the friction coefficient on the real contact thread tooth was measured by the developed experimental equipment that could be used to simulate the contact of threaded surfaces approximately. By applying the new method on P-110S threaded connection and comparing the results obtained by analytical model with the true make-up torque in application, it could be found that the analytical model and the calculation method proposed in this paper are reasonable. The new method was also validated by using the finite element analysis method to the same sample. The new method proposed in this paper is practical and convenient because it can be applied to calculate the tightening torque just with geometric parameters and thread numbers, which is easier to implement in application.

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