Roller–rail parameters on the transverse vibration characteristics of super-high-speed elevators

2019 ◽  
Vol 43 (4) ◽  
pp. 535-543 ◽  
Author(s):  
Shunxin Cao ◽  
Ruijun Zhang ◽  
Shuohua Zhang ◽  
Shuai Qiao ◽  
Dongsheng Cong ◽  
...  
Keyword(s):  
High Speed ◽  
Relative Displacement ◽  
Guide Rail ◽  
Coupled Vibration ◽  
Vibration Acceleration ◽  
Vibration Model ◽  
Vibration Problems ◽  
Equivalent Method ◽  
Relationship Of ◽  
The Relationship

Interaction and wear between wheel and rail become increasingly serious with the increase in elevator speed and load. Uneven roller surface, eccentricity of rollers, and the looseness of rail brackets result in serious vibration problems of high-speed and super-high-speed elevators. Therefore, the forced vibration differential equation representing elevator guide rails is established based on Bernoulli–Euler theory, and the vibration equation of the elevator guide shoes and the car is constructed using the Darren Bell principle. Then, the coupled vibration model of guide rail, guide shoes, and car can be obtained using the relationship of force and relative displacement among these components. The roller–rail parameters are introduced into the established coupled vibration model using the model equivalent method. Then, the influence of roller–rail parameters on the horizontal vibration of super-high-speed elevator cars is investigated. Roller eccentricity and the vibration acceleration of the car present a linear correlation, with the amplitude of the car vibration acceleration increasing with the eccentricity of the roller. A nonlinear relationship exists between the surface roughness of the roller and the vibration acceleration of the car. Increased continuous loosening of the guide rail results in severe vibration of the car at the loose position of the support.

Aerodynamic Characteristics Analysis of High-Speed Train on Cutting under Crosswinds

2013 ◽  
Vol 300-301 ◽  
pp. 62-67
Author(s):  
Kun Ye ◽  
Ren Xian Li
Keyword(s):  
High Speed ◽  
Three Dimensional ◽  
Aerodynamic Characteristics ◽  
High Speed Train ◽  
Aerodynamic Forces ◽  
Cutting Depth ◽  
Cutting Slope ◽  
Characteristics Analysis ◽  
Relationship Of ◽  
The Relationship

Cutting is an effective device to reduce crosswind loads acting on trains. The cutting depth, width and gradient of slope are important factors for design and construction of cutting. Based on numerical analysis methods of three-dimensional viscous incompressible aerodynamics equations, aerodynamic side forces and yawing moments acting on the high-speed train, with different depths and widths of cutting，are calculated and analyzed under crosswinds，meanwhile the relationship of the gradient of cutting slope and transverse aerodynamic forces acting on trains are also studied. Simulation results show that aerodynamic side forces and yawing moments acting on the train（the first, middle and rear train）decrease with the increase of cutting depth. The relationship between transverse forces (moments) coefficients acting on the three sections and the cutting depth basically is the three cubed relation. The bigger is cutting width，the worse is running stability of train. The relationship between yawing moments coefficients acting each body of the train and the cutting width approximately is the three cubed relation. The transverse Aerodynamic forces decreased gradually with the increase of the gradient of cutting slope, the relationship between yawing moments coefficients acting each body of the train and the gradient of cutting slope basically is the four cubed relation.

Method of Calculating Chamber Earth Pressure of EPB Shield

2014 ◽  
Vol 886 ◽  
pp. 426-431 ◽  
Author(s):  
Bo Liang ◽  
Jing Cao ◽  
Hai Xing Yang ◽  
Zu De Ding ◽  
Hui Ming Zhao
Keyword(s):  
Limit Equilibrium ◽  
Earth Pressure ◽  
Relative Displacement ◽  
Shield Tunnel ◽  
Limit States ◽  
Relationship Of ◽  
The Relationship ◽  
Epb Shield ◽  
Selection Of ◽  
Construction Practice

In order to calculate earth pressure in working chamber, three calculation modes which corresponding to status of elastic balanced, active limit equilibrium and passive limit equilibrium of the soil on the excavation face was built. The relationship of relative displacement between the soil in the chamber and the soil on the excavation face of shallow EPB shield tunnel was analyzed based on Rankines earth pressure theory. The threshold of chamber earth pressure values which correspond to the limit states of subsidence and upheaval were deduced and the reasonable range of the values were obtained. Combined with a shield tunnel construction practice, the theoretical and measured values are compared. The results show that the theoretical equations are valid and can provide a theoretical approach for the selection of chamber earth pressure.

Signal Integrity Analysis of High-Speed Signal Connector USB3.0

2013 ◽  
Vol 760-762 ◽  
pp. 320-324
Author(s):  
Shi Lei Zhou ◽  
Ya Lin Guan ◽  
Xin Kun Tang
Keyword(s):  
Transmission Lines ◽  
High Speed ◽  
Signal Integrity ◽  
Signal Transmission ◽  
Simulation Software ◽  
Key Factor ◽  
Transmission Quality ◽  
Integrity Analysis ◽  
Relationship Of ◽  
The Relationship

High-speed signal connector has become a key factor of the signal transmission quality in telecommunications and data communications system. Signal integrity of connector is an inevitable problem. This paper based on the theory of differential transmission lines and Multimode S-Parameters, analyzed the USB3.0 connector signal integrity. And use 3D simulation software CST to build model and analyze the relationship of signal integrity and connectors geometry.

scholarly journals FORMING IDEAL 30 METER RUNNING TECHNIQUE IN 12-YEAR-OLD SCHOOLCHILDREN

2020 ◽  
Vol 20 (2) ◽  
pp. 108-115
Author(s):  
R Gimazov ◽  
G Bulatova
Keyword(s):  
High Speed ◽  
Structural Phase ◽  
Video Recording ◽  
Biomechanical Analysis ◽  
Second Stage ◽  
Group A ◽  
Relationship Of ◽  
The Relationship ◽  
Experimental Group ◽  
Parametric And Nonparametric Statistics

Aim. The article aims to achieve the accuracy of space-time characteristics of a running step in 11–12-year-old schoolchildren. Materials and methods. The article provides a comparative analysis of the results of training and improving the running step in the control and experimental groups. For an objective instrumental assessment of the second stage of training, a structural phase biomechanical analysis of movements based on data from high-speed digital video recording with a frequency of 240 frames per second was used. Changes in the technique of the running step in schoolchildren were analyzed in the take-off phase (when the supporting leg pushed away from the surface of the treadmill), in the float phase and in the amortization phase. Methods of parametric and nonparametric statistics were used. Results. In schoolchildren from the experi­mental group, a statistically significant positive increase in the coefficients of the relationship of the angular characteristics of the running step with the model indicators of the American sprinter Ryan Bailey was achieved, which objectively reflects a significant increase in 30 meter running speed. Conclusion. Taking into account the natural rules of nervous system mechanisms made it possible to objectively increase the efficiency of running technique in the experimental group.

Development of a Multi-Ball-Cantilever AFM for Measuring Resist Surface

2006 ◽  
Vol 18 (6) ◽  
pp. 698-704 ◽  
Author(s):  
Shujie Liu ◽  
◽  
Shuichi Nagasawa ◽  
Satoru Takahashi ◽  
Kiyoshi Takamasu
Keyword(s):  
High Speed ◽  
Surface Deformation ◽  
Surface Profile ◽  
Displacement Curve ◽  
The Finite Element Method ◽  
Measuring Surface ◽  
Surface Profiles ◽  
Relationship Of ◽  
The Relationship ◽  
Force Displacement

Semiconductor processing must be fast and highly accurate when measuring the surface profile of soft thin films such as photoresists. We propose doing so using a multi-ball-cantilever AFM, which covers a wide area at high speed. Each cantilever has a ball stylus with a diameter that does not plastically deform measured surfaces. We studied resist profiles and the influence of the AFM stylus on the resist surface. To verify our proposal’s feasibility, we simulated the relationship of the indenter shape, size, and load and resist surface deformation using the finite element method (FEM). We discuss the influence of the AFM stylus based on the force-displacement curve. Experiments using the multi-ball-cantilever AFM confirmed its feasibility for measuring surface profiles highly accurately.

The Research Progress of Melanin

2011 ◽  
Vol 204-210 ◽  
pp. 2057-2060
Author(s):  
Jian Ming Wang ◽  
Ai Hua Ao ◽  
Chang Sheng Qiao ◽  
Yu Zhong ◽  
Yuan Yuan Zhang
Keyword(s):  
High Speed ◽  
High Performance ◽  
Analytical Techniques ◽  
Research Progress ◽  
Countercurrent Chromatography ◽  
New Techniques ◽  
Wide Range ◽  
High Performance Capillary Electrophoresis ◽  
Relationship Of ◽  
The Relationship

The sources of melanin and the sorts of melanin are introduced. New techniques for extraction and analysis of natural melanin were introduced. New analytical techniques are high performance liquid chromatography, high-speed countercurrent chromatography, high performance capillary electrophoresis and chromatography-mass spectrometry. The relationship of polyketide melanogenesis molecular biology to that of nonmelanin-producing pathways in a wide range of fungi and other organisms is discussed. The applications of melanin are introduced.

Researching and Calculating the Effect of the Slides and the Nozzles’ Structural Positions of "Rice Sorting Machine”

2015 ◽  
Vol 656-657 ◽  
pp. 712-718
Author(s):  
Thanh Son Le ◽  
Thien Binh Nguyen ◽  
Thanh Nam Nguyen ◽  
Huy Bich Nguyen ◽  
Huynh Lam Phan
Keyword(s):  
High Speed ◽  
Ccd Camera ◽  
Relative Distance ◽  
Control Module ◽  
Identification Process ◽  
Standard Work ◽  
Sorting Machine ◽  
Main Factors ◽  
Relationship Of ◽  
The Relationship

Rice Color Sorter plays an important role in the postharvest rice processing assembly. The quality and price of rice export will be increased by using this machine for classifying finished-rice. This paper presents the designing, the slide–adjustment structure and the position of nozzles for a rice color sorter machine. Slides, nozzles and materials-catching slide are main factors in classifying-component of Rice Color Sorter. The relative positions of these factors will decide the accuracy and response-ability of identification process using the high speed CCD camera. Moreover, the relationship of parameters decides the relative distance between devices in classifying-component of Rice Color Sorter with a standard-work mode. It also gives suitable-adjustment-structures for Rice Color Sorter responding the best image-identifying-control module of CCD camera.

High-Speed Slicing of SiC Ingot by High-Speed Multi Wire Saw

2014 ◽  
Vol 778-780 ◽  
pp. 771-775 ◽  
Author(s):  
Hiroto Maeda ◽  
Ryuichi Takanabe ◽  
Atsunori Takeda ◽  
Syogo Matsuda ◽  
Tomohisa Kato
Keyword(s):  
Single Crystal ◽  
High Speed ◽  
Low Cost ◽  
Scale Up ◽  
Wire Saw ◽  
High Efficient ◽  
Diamond Wire Sawing ◽  
Relationship Of ◽  
Sic Wafer ◽  
The Relationship

Development of high efficient and high accuracy slice processing technology is required for realizing the high quality and low cost large SiC wafer. Our target of high speed slicing is slicing a 6 inch SiC single crystal ingot in about 9 hours. This slicing speed is about 10 times higher than the loose abrasive slurry sawing and about 4 times higher than the current technology of diamond wire sawing. The slicing speed and the slicing accuracy are in the relationship of trade-off. Therefore, in this research, we have studied the high speed slicing technique of 3 inch and 4 inch SiC single crystal ingot aiming at reduction of sliced wafers SORI. Moreover, we have extracted subjects to scale-up for the high speed slicing of the 6 inch SiC single crystal ingot.

Relationship of Fractal Structure and Compactibility of Coarse Grain Soil in High Speed Railway Subgrade

2013 ◽  
Vol 438-439 ◽  
pp. 1108-1111 ◽  
Author(s):  
Ya Bing Huang ◽  
Yan Jun Li ◽  
Tan Jiao
Keyword(s):  
High Speed ◽  
Fractal Theory ◽  
Fractal Dimensions ◽  
Coarse Grained ◽  
Dry Density ◽  
Maximum Dry Density ◽  
High Speed Railway ◽  
Compaction Characteristics ◽  
Relationship Of ◽  
The Relationship

As an important factor that affects the compaction characteristics of the coarse grained fillers in the high speed railway subgrade, the grain composition is characterized by the application of the fractal theory. Several types of the coarse grained fillers were selected for testing and the results indicated that the relationship actually exists between the compaction characteristics and the fractal dimensions. The variation law of the maximum dry density fluctuating with the quality fractal dimension was analyzed and the results were supposed to estimate the compaction characteristics of the coarse grained fillers.

The automatic selection of molecular crystal structures by combining stereochemical criteria and high-speed computing

1962 ◽  
Vol 267 (1331) ◽  
pp. 566-589 ◽  
Keyword(s):  
Crystal Structures ◽  
Molecular Crystal ◽  
High Speed ◽  
Molecular Crystals ◽  
Diamagnetic Anisotropy ◽  
Initial Stage ◽  
Trial Structure ◽  
Relationship Of ◽  
The Relationship ◽  
Selection Of

The increasing use of digital computers in the final stages of the analysis of the structures of molecular crystals now means that the selection of a trial structure for automatic refinement has become the most time-consuming phase of such analyses. This paper shows that in certain types of problem this initial stage can also be carried out on computers, by making use of stereochemical information available at the outset. Examples of the successful application of such methods are given, and ways of increasing their power and flexibility when very fast computers become available are described. The relationship of such geometrical calculations to problems in crystal physics is also indicated, and it is shown that in appropriate cases measurements of, for example, diamagnetic anisotropy can be combined with geometrical results to provide an exceptionally rapid selection of possible molecular orientations.

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