The Effect on the Stability of Rear Drive Vehicle with Viscous Limited Slip Differential

2014 ◽  
Vol 716-717 ◽  
pp. 730-734
Author(s):  
Li Qiang Jin ◽  
Ze Wei Wang ◽  
Dong Xu Yin
Keyword(s):  
Vertical Movement ◽  
Longitudinal Motion ◽  
Lateral Movement ◽  
Unequal Distribution ◽  
Movement Characteristics ◽  
Dynamic Simulation Model ◽  
Vehicle Dynamic Simulation ◽  
Motion Characteristics ◽  
The Stability ◽  
Dynamics Stability

This article reflects the influence on the limited slip differential (LSD) for the rear drive vehicle handling and stability through the process of stress analysis of automotive steering movement, where the vehicle dynamic simulation model including the LSD system is established, and it also has the analysis of the effects on the LSD for vehicle dynamics stability. Viscous Limited Slip Differential (VLSD) has influences on the motion characteristics of the vehicle in many aspects, including vertical movement and lateral movement that is most remarkable. It is obvious to improve the dynamic property and trafficability by it on the bad road for cars in longitudinal motion, but at the same time it also produce a great impact on the lateral movement characteristics of the automobile because of the unequal distribution of vehicle driving force.

15–16 year old female basketball, volleyball and soccer players’ vertical movement characteristics

2017 ◽  
Vol 4 (90) ◽  
pp. 68-74
Author(s):  
Darius Radžiukynas ◽  
Nelė Žilinskienė ◽  
Eglė Kemerytė - Riaubienė ◽  
Raminta Sakalauskaitė
Keyword(s):  
Vertical Movement ◽  
Soccer Players ◽  
Movement Characteristics

Numerical and Experimental Approaches to Investigate the Stability of a Motorcycle Vehicle

2006 ◽  
Author(s):  
Federico Cheli ◽  
Marco Bocciolone ◽  
Marco Pezzola ◽  
Elisabetta Leo
Keyword(s):  
Degrees Of Freedom ◽  
Structural Parameters ◽  
Experimental Tests ◽  
Roll Angle ◽  
Longitudinal Motion ◽  
Reference Trajectory ◽  
Steering Angle ◽  
Steady State Condition ◽  
The Stability ◽  
Linearized Model

The study of motorcycle’s stability is an important task for the passenger’s safety. The range of frequencies involved for the handling stability is lower than 10 Hz. A numerical model was developed to access the stability of a motorcycle vehicle in this frequency range. The stability is analysed using a linearized model around the straight steady state condition. In this condition, the vehicle’s vertical and longitudinal motion are decoupled, hence the model has only four degrees of freedom (steering angle, yaw angle, roll angle and lateral translation), while longitudinal motion is imposed. The stability was studied increasing the longitudinal speed. The input of the model can be either a driver input manoeuvre (roll angle) or a transversal component of road input able to excite the vibration modes. The driver is introduced in the model as a steering torque that allows the vehicle to follow a reference trajectory. To validate the model, experimental tests were done. To excite the vehicle modes, the driver input was not taken into account considering both the danger for the driver and the repeatability of the manoeuvre. Two different vehicle configurations were tested: vehicle 1 is a motorcycle [7] and vehicle 2 is a scooter. Through the use of the validated model, a sensitivity analysis was done changing structural (for example normal trail, steering angle, mass) and non structural parameters (for example longitudinal speed).

scholarly journals Experimental Study on 2D Motion Characteristics of Submerged Floating Tunnel in Waves

2020 ◽  
Vol 8 (2) ◽  
pp. 123 ◽  
Author(s):  
Zhiwen Yang ◽  
Jinzhao Li ◽  
Huaqing Zhang ◽  
Chunguang Yuan ◽  
Hua Yang
Keyword(s):  
Wave Height ◽  
Water Surface ◽  
Weight Ratio ◽  
Mooring Line ◽  
Natural Period ◽  
Main Challenge ◽  
Line Angle ◽  
Submerged Floating Tunnel ◽  
Motion Characteristics ◽  
The Stability

Submerged floating tunnel (SFT) is a new type of transportation infrastructure for crossing sea straits in relatively deeper water. Compared with the fixed tunnel, the main challenge in designing a SFT is the stability maintaining in a complex hydrodynamic environment, especially for the wave-induced dynamic load. In this study, a series of systematic experiments were conducted to investigate the 2D motion characteristics (i.e., heave, sway and roll) of the SFT exposed to regular waves. The movement of the SFT model is measured by the image processing method which is a noncontact measurement. The experimental observation of SFT motion during the process of wave and SFT interaction is described in detail, and the influence of several governing parameters is thoroughly analyzed, including the wave height and period, submergence depth, buoyancy to weight ratio (BWR), and the mooring line angle. The results show that the motion amplitudes of SFT increase with the wave height increasing. The effect of wave period is related to the natural period of the structure. The sway, heave and roll of the SFT submerged beneath the water surface are much smaller than that of the SFT on the water surface. With the increase of BWR, the motion of SFT decreases. The motion amplitude increases with mooring line angle increasing. Finally, empirical equations are proposed to estimate the motion characteristics of the SFT.

A spatial analysis of lateral and vertical fluxes of water associated with a perched watertable in a duplex soil

Soil Research ◽  
2000 ◽  
Vol 38 (4) ◽  
pp. 879 ◽  
Author(s):  
J. Eastham ◽  
P. J. Gregory ◽  
D. R. Williamson
Keyword(s):  
Spatial Analysis ◽  
Water Movement ◽  
Soil Surface ◽  
Vertical Movement ◽  
Climatic Conditions ◽  
Clay Layer ◽  
Lateral Movement ◽  
Vertical Fluxes ◽  
Heavy Clay ◽  
Experimental Plots

Rates of lateral and vertical movement of water were investigated when severe waterlogging occurred as a result of a perched watertable over a clay subsoil in a duplex soil on a low (1.6%) slope in Western Australia. The severity of waterlogging and both the lateral and vertical fluxes of water at the 1.4 ha site were very spatially variable. Lateral water movement occurred in response to topographical gradients in the soil surface and the depth of the clay layer. As a result of this lateral redistribution of water, the depth of the watertable was greater in some areas, causing higher rates of vertical water loss (1.6–1.7 mm/day) compared with the rest of the site (1.2–1.5 mm/day). Net gains or losses in water in experimental plots at the site due to lateral flow were 1–2 orders of magnitude smaller than vertical losses. Net lateral losses were less than 0.3 mm/day, but vertical losses ranged from 1.2 to 1.7 mm/day. We conclude that vertical drainage beneath crops growing on a duplex soil with a heavy clay subsoil can be significant when a head of water develops under climatic conditions conducive to waterlogging. In contrast, net lateral movement was generally small because of the low slope at the site (gradient of 0.016), and is likely to be insignificant at this site and other sites with duplex soils on similarly low slopes.

An Analysis of the Static and Dynamic Stability of an Hypersonic Transport Aircraft Longitudinal Motion Flying at Hypersonic Speeds and Various Heights

2012 ◽  
Author(s):  
D. Mclean ◽  
Z.A. Zaludin ◽  
P.R. Arora
Keyword(s):  
Mathematical Model ◽  
Dynamic Stability ◽  
Static Stability ◽  
Longitudinal Motion ◽  
Transport Aircraft ◽  
Static And Dynamic Stability ◽  
Hypersonic Speeds ◽  
Scramjet Engine ◽  
The Stability ◽  
Engine Condition

Suatu kajian tentang kestabilan statik dan dinamik pesawat pengangkutan hipersonik hipotesis telah dilakukan dengan menggunakan model matematik untuk pergerakan membujur semasa penerbangan di keadaan penerbangan yang berlainan. Hasil daripada analisis kestabilan menunjukkan bahawa pesawat tersebut akan menjadi lebih tidak stabil apabila penerbangan di nombor Mach dan ketinggian yang lebih tinggi daripada keadaan penerbangan nominal. Juga disertakan di sini keadaan enjin scramjet apabila pesawat ini terbang pada kelajuan hipersonik dan ketinggian yang berlainan. Kata kunci: dinamik pesawat; kestabilan dinamik; kestabilan statik; enjin scramjet A study of the static and dynamic stability of an hypothetical hypersonic transport aircraft was conducted based on a mathematical model of the longitudinal motion of the aircraft flying at a number of different flight conditions. The result from the stability analysis has shown that the aircraft becomes even less stable at higher Mach numbers and heights than the nominal flight condition. Also discussed here is the scramjet engine condition when the aircraft was simulated to be flying at hypersonic speeds and different heights. Key words: aircraft dynamics; dynamic stability; static stability; scramjet engine

Stability Analysis of Two-Point Mooring System in Surge Oscillation

2010 ◽  
Vol 5 (2) ◽  
Author(s):  
A. K. Banik ◽  
T. K. Datta
Keyword(s):  
Harmonic Wave ◽  
Period Doubling ◽  
Mooring System ◽  
Restoring Force ◽  
Incremental Harmonic Balance ◽  
Cubic Polynomial ◽  
Motion Characteristics ◽  
The Stability ◽  
Continuation Technique ◽  
Amplitude Versus

Nonlinear surge response behavior of a multipoint mooring system under harmonic wave excitation is analyzed to investigate various instability phenomena such as bifurcation, period-doubling, and subharmonic and chaotic responses. The nonlinearity of the system arises due to nonlinear restoring force, which is modeled as a cubic polynomial. In order to trace different branches at the bifurcation point on the response curve (amplitude versus frequency of excitation plot), an arc-length continuation technique along with the incremental harmonic balance (IHBC) method is employed. The stability of the solution is investigated by the Floquet theory using Hsu’s scheme. The period-one and subharmonic solutions obtained by the IHBC method are compared with those obtained by the numerical integration of the equation of motion. Characteristics of solutions from stable to unstable zones, chaotic motion, nT solutions, etc., are identified with the help of phase plots and Poincaré map sections.

scholarly journals Visual Dynamic Simulation Model of Unstructured Data in Social Networks

2022 ◽  
Vol 2022 ◽  
pp. 1-10
Author(s):  
Zhang Xiang
Keyword(s):  
Social Networks ◽  
Social Network ◽  
Simulation Model ◽  
Dynamic Simulation ◽  
Data Visualization ◽  
Time Correlation ◽  
Unstructured Data ◽  
Dynamic Simulation Model ◽  
Visualization Technology ◽  
The Stability

Social networks contain a large amount of unstructured data. To ensure the stability of unstructured big data, this study proposes a method for visual dynamic simulation model of unstructured data in social networks. This study uses the Hadoop platform and data visualization technology to establish a univariate linear regression model according to the time correlation between data, estimates and approximates perceptual data, and collects unstructured data of social networks. Then, the unstructured data collected from the original social network are processed, and an adaptive threshold is designed to filter out the influence of noise. The unstructured data of social network after feature analysis are processed to extract its visual features. Finally, this study carries out the Hadoop cluster design, implements data persistence by HDFS, uses MapReduce to extract data clusters for distributed computing, builds a visual dynamic simulation model of unstructured data in social network, and realizes the display of unstructured data in social network. The experimental results show that this method has a good visualization effect on unstructured data in social networks and can effectively improve the stability and efficiency of unstructured data visualization in social networks.

scholarly journals Dynamic Analysis on Nonlinear Fluid-Structure Interaction Forces of Rub-Impact Rotor System

2014 ◽  
Vol 8 (1) ◽  
pp. 480-486
Author(s):  
Yuegang Luo ◽  
Songhe Zhang ◽  
Bin Wu ◽  
Wanlei Wang
Keyword(s):  
Numerical Simulation ◽  
Coupling Model ◽  
Rotor System ◽  
Nonlinear Dynamic Model ◽  
Interaction Forces ◽  
Structure Interaction ◽  
Movement Characteristics ◽  
Set Up ◽  
The Stability ◽  
Nonlinear Fluid

Based on the coupling model of nonlinear oil-film force and nonlinear seal fluid force, a nonlinear dynamic model of rotor system with rub-impact fault is set up. The dynamic characteristics of the system were studied with numerical simulation and the effects of airflow excited force, rubbing gap and stiffness parameters on movement characteristics of the rotor were analyzed. The results indicate that the airflow excited force can significantly restrain the stability and amplitude of rubbing rotor. The less rubbing gap and larger rubbing stiffness are in favor of the stability of the system.

scholarly journals Influence Law of Interbedded Strata and Their Collapse on the Mining of Extremely Thick Coal Seam under Goaf

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Chunxu Ji ◽  
Yongkang Yang ◽  
Xingyun Guo ◽  
Tianhe Kang ◽  
Zefeng Guo
Keyword(s):  
Coal Seam ◽  
Water Inrush ◽  
Theoretical Models ◽  
Pressure Control ◽  
Future Research ◽  
Simulation Experiments ◽  
Thick Coal Seam ◽  
Movement Characteristics ◽  
Mining Pressure ◽  
The Stability

Interbedded strata and their collapse are vital to mining pressure control for extremely thick coal seam under goaf. To ensure the stability of the support and to avoid roof collapse, some traditional underground pressure theoretical models had been widely used in the control of surrounding rock and the selection of support. However, one of the challenges for extremely thick coal seam under goaf is that the abnormal disasters, such as support crushing and water inrush that were occurring frequently. To solve this problem, the movement characteristics of overburden rocks during the mining of extremely thick coal seam under the conditions of the interlayer thickness of 5 m and 40 m were studied by using the similar simulation experiments, while the numerical simulation experiments were carried out for the interval between coal seams of 15 m and 60 m, respectively. Finally, the structure and mechanical transfer mechanism of overburden in stope under different thickness interbedded strata were analyzed dynamically, and the condition of full-thickness connection between upper goaf and lower goaf and corresponding judgment criteria are obtained. These results can guide future research on the mechanical of extremely thick coal seam under goaf, which can provide a theoretical basis and engineering reference for similar projects.

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