scholarly journals Simulation Analysis and Experimental Verification of the Locking Torque of the Microgravity Platform of the Chinese Space Station

2020 ◽  
Vol 11 (1) ◽  
pp. 102
Author(s):  
Guangming Liu ◽  
Haitao Luo ◽  
Changshuai Yu ◽  
Haochen Wang ◽  
Lilu Meng
Keyword(s):  
Experimental Verification ◽  
Simulation Analysis ◽  
Structural Characteristics ◽  
Space Station ◽  
Vibration Test ◽  
Rocket Launch ◽  
Scientific Experiment ◽  
Safety And Reliability ◽  
Driving Torque ◽  
The Relationship

The Microgravity Platform (MP) of the Chinese Space Station is locked and released by Lock-or-Release (L/R) mechanism on both sides. In order to ensure the safety and reliability of the MP under the vibration environment during the rocket launch, the L/R mechanism must output the appropriate locking torque value. Based on the structural characteristics of the Scientific Experiment Cabinet (SEC), this paper proposes a method of evaluating locking torque by combining theory with experiment, and the relationship between locking force and locking torque of L/R mechanism is proved that the locking force on both sides can reach 2000 N at 25 Nm driving torque. Finally, it is verified by vibration test that the locking torque obtained by this method can effectively guarantee the safety and reliability of the MP under vibration environment.

The Constant Power Control of Hydraulic Grinding Saw

2006 ◽  
Vol 304-305 ◽  
pp. 465-468
Author(s):  
Jin Chun Song ◽  
J.W. Chen ◽  
Zhi Wei Zhang
Keyword(s):  
Simulation Analysis ◽  
Servo System ◽  
Metallurgical Industry ◽  
Grinding Wheel ◽  
Constant Power ◽  
Hydraulic Servo ◽  
Feeding Speed ◽  
Hydraulic Servo System ◽  
Driving Torque ◽  
The Relationship

Hydraulic grinding saw is a kind of important equipment broadly used in billet precise cutting in metallurgical industry. In order to improve productivity significantly, control feeding speed reasonably, at the same time to compensate the variation of driving torque caused by the change of contacting area between grinding wheel and slab, thus to obtain the optimized match between the feed of the grinding wheel and the driving motor, the application of hydraulic servo system in the control of the feeding speed of grinding wheel is discussed in this thesis. This article introduces the principle of hydraulic grinding saw, brings out the project of constant power PID control based on the relationship between driving torque and motor current. The transfer function of the hydraulic servo system, the optimized PID controller is also worked out. According to the result of simulation analysis, the controlling factors can be well obtained.

Simulation Analysis of Output Characteristic of the Inductive Displacement Transducer

2012 ◽  
Vol 571 ◽  
pp. 600-603
Author(s):  
Ruo Feng Song ◽  
Li Ming Song ◽  
Qian Ming Yang
Keyword(s):  
Simulation Analysis ◽  
Structural Characteristics ◽  
Displacement Transducer ◽  
Output Characteristic ◽  
Displacement Sensor ◽  
Temperature Drift ◽  
Linear Extent ◽  
Working Principle ◽  
Displacement Transducers ◽  
The Relationship

Aiming at the structure and electromagnetic induction characteristics of inductive displacement transducers, it is inevitable to appear the problem between nonlinearity output and temperature drift, by which it’s testing accuracy is affected, on the basis of analysis of structural characteristics and working principle of the inductive displacement sensor, mathematical model of the relationship between input and output has been constructed, which can be simulated and analyzed by MATLAB software. The results indicate that the inductive displacement transducer has an proximately linear extent ( ) and the linearity errors are influenced by the coils number and the semidiameter;In the case of relatively constant of other parameters, when the coil of radius and the number of coil turns are fixed ,there will be the core displacement x and , the sensor output characteristic has an favorable linearity under the circumstances of changing the coil radius and the number of turns in proper sequence; When ,the output property of the sensor appears worse linearity.

scholarly journals Fractal Nature of Advanced Ni-Based Superalloys Solidified on Board the International Space Station

2021 ◽  
Vol 13 (9) ◽  
pp. 1724
Author(s):  
Vojislav Mitić ◽  
Cristina Serpa ◽  
Ivana Ilić ◽  
Markus Mohr ◽  
Hans-Jörg Fecht
Keyword(s):  
International Space Station ◽  
Fractal Analysis ◽  
Power Plants ◽  
Materials Science ◽  
Structural Characteristics ◽  
Turbine Blades ◽  
Space Station ◽  
Casting Process ◽  
Cross Sectional ◽  
International Space

Materials science is highly significant in space program investigation, energy production and others. Therefore, designing, improving and predicting advanced material properties is a crucial necessity. The high temperature creep and corrosion resistance of Ni-based superalloys makes them important materials for turbine blades in aircraft engines and land-based power plants. The investment casting process of turbine blades is costly and time consuming, which makes process simulations a necessity. These simulations require fundamental models for the microstructure formation. In this paper, we present advanced analytical techniques in describing the microstructures obtained experimentally and analyzed on different sample’s cross-sectional images. The samples have been processed on board the International Space Station using the MSL-EML device based on electromagnetic levitation principles. We applied several aspects of fractal analysis and obtained important results regarding fractals and Hausdorff dimensions related to the surface and structural characteristics of CMSX-10 samples. Using scanning electron microscopy (SEM), Zeiss LEO 1550, we analyzed the microstructure of samples solidified in space and successfully performed the fractal reconstruction of the sample’s morphology. We extended the fractal analysis on the microscopic images based on samples solidified on earth and established new frontiers on the advanced structures prediction.

Influence Parameters Analysis of Forming Quality and System Dynamics Simulation of Vertical Steel Bar Benting

2013 ◽  
Vol 483 ◽  
pp. 280-284
Author(s):  
Xi Jian Zheng ◽  
Xin Zhuo Wang ◽  
Jin Meng Zhang ◽  
Yu Fei Zhu
Keyword(s):  
Simulation Analysis ◽  
Reference Value ◽  
Dynamics Simulation ◽  
Forming Quality ◽  
Steel Bar ◽  
New Process ◽  
Cutting Length ◽  
Bending Radius ◽  
The Relationship

The vertical steel bar bending forming is a kind of new process of bending method. The bending speed, bending radius and clamping length H which is the parameters of vertical steel bar bending machine , is directly affect the quality of bending forming parts. This paper calculated the length of reinforcement before being incised and the springback angle of bending steel bar which obtained the reasonable cutting length and bending Angle; Then based on rigid-flexible virtual prototype technology to build the dynamics model of vertical steel bar bending system. Through simulation analysis ,it obtained the relationship between bending speed, bending radius , clamping length H and forming quality of bending steel bar. In this paper, the analysis method have reference value to the design of similar steel bar bending machines.

scholarly journals РАСПРЕДЕЛЁННАЯ ОБРАЗНОСТЬ: ИМАГИНАТИВНЫЕ ПРАКТИКИ СОВРЕМЕННОЙ КУЛЬТУРЫ

2020 ◽  
Author(s):  
Ilya Inishev
Keyword(s):  
Structural Characteristics ◽  
Point Of View ◽  
Main Theme ◽  
Contemporary Culture ◽  
Normative Claim ◽  
Political Implications ◽  
Core Feature ◽  
And Control ◽  
The Relationship ◽  
Regime Characteristic

В статье идёт речь о формах образного, которые во всё возрастающей степени становятся характерными для современной культуры. Центральная характеристика этих форм – распределённость в пространстве и времени, их способность сопровождать нас практически повсеместно, не будучи привязанными к каким-либо организационным формам. Распределённые разновидности образного противопоставляются «традиционным», нераспределённым образам, «репрезентирующим» некоторое идентифицируемое содержание. Одна из базовых черт нераспределенного образного – заключённое в нём нормативное притязание, затрагивающее не только способы его интерпретации, но и телесные практики воспринимающего «субъекта», релевантные для его восприятия. В отличие от репрессивного характера нераспределённого образа, являющегося его структурной характеристикой, связанной с характерным для него режимом восприятия, распределённая образность базируется не на редукции и контроле телесности воспринимающего, но – напротив – на интенсификации (и в этом смысле эмансипации) его эмоционально-телесного самоприсутствия. В диахронической перспективе отношение между нераспределённой и распределённой образностью опосредовано сложной социально-исторической и материально-технологической динамикой развитого и позднего модерна. Реконструкция этой динамики позволяет выстроить генетическую связь (континуальность) между нераспределённой и распределённой образностью. В синхронической перспективе распределённая и нераспределенная разновидности образности генерируют несовместимые типы опыта с взаимоисключающими структурными характеристиками и социально-политическими импликациями (дискретность).Main theme of the article are the types of imagery becoming increasingly characteristic of contemporary culture. The core feature of these types is their being distributed across time and space, their ability to accompany us virtually everywhere, without being tied to any organizational form. Distributed imagery opposes “traditional”, non-distributed images “representing” some identifiable subject-matter. One of the essential traits of non-distributed imagery is its normative claim addressing not only the ways of its interpretation but also bodily practices of the perceiving subject, relevant for experiencing images of this kind. In contrast to the inherent oppressiveness of non-distributed image connected to a perceptual regime characteristic of it, the distributed imagery draws not on reduction and control of body of the perceiving subject but – on the contrary – on intensifying (and in this sense, on emancipating) its bodily emotional self-presence. From a diachronic point of view, the relationship between distributed and non-distributed imageries is mediated by quite a complicated socio-historical and material-technological dynamic of the developed and late modernity. Reconstruction of this dynamic enables us to identify the genetic interrelation (continuity) between non-distributed and distributed imagery. From a synchronic point of view, distributed and non-distributed imagery forms generate incompatible experience types with mutually exclusive structural characteristics and social-political implications (discontinuity).

scholarly journals An Alternate Generalized Odd Generalized Exponential Family with Applications to Premium Data

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2064
Author(s):  
Sadaf Khan ◽  
Oluwafemi Samson Balogun ◽  
Muhammad Hussain Tahir ◽  
Waleed Almutiry ◽  
Amani Abdullah Alahmadi
Keyword(s):  
Exponential Family ◽  
Simulation Analysis ◽  
Structural Characteristics ◽  
Stochastic Ordering ◽  
Quantile Function ◽  
Risk Theory ◽  
Data Sets ◽  
Exponential Distributions ◽  
New Family ◽  
Lehmann Alternative

In this article, we use Lehmann alternative-II to extend the odd generalized exponential family. The uniqueness of this family lies in the fact that this transformation has resulted in a multitude of inverted distribution families with important applications in actuarial field. We can characterize the density of the new family as a linear combination of generalised exponential distributions, which is useful for studying some of the family’s properties. Among the structural characteristics of this family that are being identified are explicit expressions for numerous types of moments, the quantile function, stress-strength reliability, generating function, Rényi entropy, stochastic ordering, and order statistics. The maximum likelihood methodology is often used to compute the new family’s parameters. To confirm that our results are converging with reduced mean square error and biases, we perform a simulation analysis of one of the special model, namely OGE2-Fréchet. Furthermore, its application using two actuarial data sets is achieved, favoring its superiority over other competitive models, especially in risk theory.

scholarly journals Algorithm and Simulation of Association Rules of Drug Relationship Based on Network Model

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Hui Teng ◽  
Yukun Ma ◽  
Di Teng
Keyword(s):  
Decision Making ◽  
Network Model ◽  
Association Rules ◽  
Association Rule ◽  
Simulation Analysis ◽  
Pharmaceutical Research ◽  
Accurate Analysis ◽  
Systematic Analysis ◽  
Relationship Of ◽  
The Relationship

Studying drug relationships can provide deeper information for the construction and maintenance of biomedical databases and provide more important references for disease treatment and drug development. The research model has expanded from the previous focus on a certain drug to the systematic analysis of the pharmaceutical network formed between drugs. Network model is suitable for the study of the nonlinear relationship of the pharmaceutical relationship by modeling the data learning. Association rule mining is used to find the potential correlations between the various sets of massive data. Therefore, based on the network model, this research proposed an algorithm for drug interaction under improved association rules, which achieved accurate analysis and decision-making of drug relationship. Meanwhile, this research applied the established association rule algorithm to discuss the relationship between Chinese medicine and mental illness medicine and conducted the algorithm research and simulation analysis of the association relationship. The results showed the association rule algorithm based on the network model constructed was better than other association algorithms. It had reliability and superiority in decision-making in improving the drug-drug relationship. It also promoted the rational use of medicines and played a guiding role in pharmaceutical research. This provides scientific research personnel with research basis and research ideas for disease-related diagnosis.

scholarly journals BASELINE ERROR ANALYSIS AND EXPERIMENTAL VALIDATION FOR HEIGHT MEASUREMENT OF FORMATION INSAR SATELLITE

2018 ◽  
Vol XLII-3 ◽  
pp. 371-376
Author(s):  
X. Gao ◽  
T. Li ◽  
X. Zhang ◽  
X. Geng
Keyword(s):  
Stochastic Model ◽  
Error Propagation ◽  
Experimental Validation ◽  
Simulation Analysis ◽  
Srtm Dem ◽  
Height Measurement ◽  
Spatial Distribution Characteristics ◽  
Propagation Rule ◽  
The Relationship ◽  
Baseline Error

In this paper, we proposed the stochastic model of InSAR height measurement by considering the interferometric geometry of InSAR height measurement. The model directly described the relationship between baseline error and height measurement error. Then the simulation analysis in combination with TanDEM-X parameters was implemented to quantitatively evaluate the influence of baseline error to height measurement. Furthermore, the whole emulation validation of InSAR stochastic model was performed on the basis of SRTM DEM and TanDEM-X parameters. The spatial distribution characteristics and error propagation rule of InSAR height measurement were fully evaluated.

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