Papers by Keyword: Temperature Measurement

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Authors: Peter Demmel, Martin Hirsch, Roland Golle, Hartmut Hoffmann
Abstract: Blanking is one of the most widely used manufacturing technologies in sheet metalprocessing, because nearly each sheet must be trimmed out of a semi-finished part or has to beblanked after a forming process to get the precast part in the manufacturing chain. In general, a highquantity of blanked parts should be manufactured without reworking the tool. Therefore a capableprocess is indispensable to avoid inadequate part quality or premature failure of the tool because ofwear. The blanking process is affected by tool parameters, the press and the material properties ofthe blanked part.However, another important factor is the occurring temperature in the shearing zone of the sheetmetal due to the dissipation of nearly 95% of the plastic work during blanking and, in addition,frictional heating. This temperature impacts the blanking process features such as tool-wear andresulting cut edge quality. It has been presumed to be negligible by a lot of authors yet. In contrastsome publications with experimental and analytical research assume that the temperature reachesvalues up to 1000°C. Therefore, this report outlines a thermoelectric method to measure theresulting temperature distribution during the blanking process on the cutting edge of the blankingpunch. The feasibility of the investigated measurement concept is shown on a concrete example.
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Authors: Ming Yun Li, Yu Ning Zhong, Jia Bao Cheng
Abstract: According to GB /T 4271-2007 in regard to the temperature control requirements, we have designed a set of closed loop temperature control system, it uses two levels of temperature control, and it uses LabVIEW PID kit and an external controllable silicon module for secondary heating fine-tuning, the whole system ensures that the solar heat collector inlet temperature stability at the setting value ± 0.1 °C.
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Authors: Yu Zhong Li
Abstract: Temperature measurement methods always including contact method and non-contact method, generally speaking, non-contact method used for detecting remote measuring objects temperature, in especially as to particular occasions such as factory workshop. This paper provides a system based FPGA(field programmable gate array)for accurate measure and analysis long distance objects temperature. The system could be used in process of industrial produce fabrication.
111
Authors: Li Hong Su, Yu Jie Sun, Jiao Qiang Zhang, Sheng Ru Qiao, Yan Ling Ai, Liang Zhang, Yan Li Wang
Abstract: The subsidence rate of nanometer particles in liquid is determined by their Brownian movement, liquid drag force and gravity. The paper utilized the relation between temperature and the Brownian movement that the Einstein’s Brownian motion equation reveals. One new method for temperature measurement is proposed which based on the subsidence rate of nanometer particles. The Einstein’s classical theory can connect with contemporary nanometer technology, it have new application.
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Authors: Xiao Qiong Zuo, Jian Ping Jia, Juan Lei
Abstract: This paper proposes a temperature measuring method of low cost and stable precision based on platinum resistance. RC discharge circuit is composed of platinum resistor and fixed capacitor,the discharge time of fixed capacitance in the circuit is used for calculating the platinum resistance temperature resistance. The experimental results show that this is a simple and low cost method .
143
Authors: Z.J. Liu, Yan Ming Quan, Liang Liang
Abstract: The transferring of electronic signal from rotating work piece or cutter presents a challenge problem. In this paper, a wireless communication method is proposed to transmit signal from rotating bodies. The corresponding device including the signal input & transmission module and the signal receiving and processing module was fabricated. The working principle of the wireless system is introduced, and a series of experiment is set up to calibrate the system accuracy and to measure the cutting temperature of the rotating work piece. The experimental results show that the wireless system has a satisfactory reliability and temperature measurement accuracy.
475
Authors: Peter Starke, Hao Ran Wu, Christian Boller
Abstract: The comprehensive characterization of the change in metallic materials’ microstructure due to an applied load is of prime importance for the understanding of basic fatigue mechanisms or more general damage evolution processes. If those mechanisms and processes are to be understood to a much greater extent, advanced fatigue life calculation methods being far away from linear damage accumulation models, have to be realized providing more than “classic fatigue data” only. Among others the PHYBAL (physically based fatigue life calculation) method including current enhancements and a thereon-based development named SteBLife (step-bar fatigue life approach) have been developed over the last 10 years. These methods allow the efforts in experimentation to be reduced by more than 90 % and therefore offer the possibility to take further fatigue relevant parameters into account. This therefore allows a variety of S,N-curves dependent on those fatigue relevant parameters to be generated with those methods easily establishing a multidimensional dataset. To just name a few examples of those parameters such as the influence of temperature, loading conditions, geometry as well as thermal and mechanical ageing processes on the fatigue behavior can now be calculated in accordance to a process being straightforward leading to an important step with regard to improving the efficiency of assessing structural components. Consequently, safety factors can be defined more in accordance to structural needs, being of highest interest with respect to the increasing number of ageing infrastructure such as highways, bridges or others. A lot of this ageing infrastructure has a strong need to be managed with respect to its structural integrity and the engineering community therefore tries the residual life of this infrastructure to be determined as appropriate as possible. In that context non-destructive testing parameters are increasingly considered to characterize a metallic material’s microstructure allowing more precise information to be obtained regarding the actual damage condition and the integrity of a component. The paper will address the high capability of non-destructive testing techniques for the evaluation of damage evolution processes also with respect to mechanism based fatigue as well as residual life calculations according to PHYBAL and SteBLife.
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Authors: Edward Rakosi, Carmen Ema Panaite, Carmen Bujoreanu, Sorinel Gicu Talif
Abstract: Internal combustion engines are typically equipped with an exhaust muffler to suppress the acoustic pulse generated by the combustion process. The paper presents the procedure and the experimental setup for some functional parameters determination as the noise level, the pressure drop and the temperatures through investigating three different manufacturing solutions for mufflers. An algorithm and a dedicated method have been proposed in order to emphasize more direct the mufflers influence on the engines performances. The procedure equally includes particular cycles of the engine and it is highlighted the relation between the engine operating conditions and the functional parameters of the automotive mufflers.
213
Authors: Yuan Yuan Ji, Wen Hai Xu, De Bin Ma, Ying Li
Abstract: Mid-wavelength infrared imager is widely used in the fields of security and detection with its unique band imaging characteristics, and it needs related studies of radiance calibration as to be used accurately and effectively. With the linear property of the infrared imager, which is the relationship between the input radiance and the output gray of the imager, the pupil radiance can be measured. Moreover, the surface temperature of the target in the image can be acquired combined with the surface characteristics. However, there is every possibility that the temperatures of the target change so much along with the day that it cannot be measured with just one linear field of the imager. This paper proposed an altering integral time method to measure temperature, which adapts to large temperature variations.
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