Parametric Study of Influence of Assembly and Design on the Center of Gravity of Public Buses

2016 ◽  
Vol 835 ◽  
pp. 609-614
Author(s):  
Surangsee Dechjarern ◽  
Piyapat Chuchuay
Keyword(s):  
Computer Simulation ◽  
Parametric Study ◽  
Safety Issue ◽  
Center Of Gravity ◽  
Gravity Change ◽  
Air Suspension ◽  
Bus Body ◽  
Bus Safety ◽  
The Stability ◽  
Simulation Center

The bus is a vehicle for transport the passenger to the destination safely. The bus manufacturing is produced directly from the company and the bus has been modifying from the bus garage. The Bus modify into popular use in the domestic because it is cheaper. The modified bus is also a safety issue because these vehicles to the tilted test 30 degrees most of the test is not passed. The center of gravity is influenced to the stability of the bus. Which the Company or modify bus garage can not know the position of the center of gravity in advance. When the bus is used to build a center of gravity located in improper placement. Hence, the test does not pass 30 degrees tilt.Which required costs to adjustment and test again. This paper was intended to study the variables that affect the center of gravity of the bus include engine placement, adjustment pressure into air suspension before build bus body, bending chassis, characterized by mounting to the chassis frame. Studies using instruments find the center of gravity of the bus used computer simulation center of gravity nearby real bus. The variable adjustment in order to design a bus with the appropriate center of gravity. Research has found that different variables adjustment engine placement characterized by mounting to the chassis frame have an affect to bending chassis relate to the center of gravity change, Therefore, the variables to be optimized, it is possible to design a bus safety.

Efficient Dynamic Computer Simulation of Simple-Closed Spatial Linkages

1990 ◽  
Author(s):  
L. T. Wang
Keyword(s):  
Computer Simulation ◽  
Computational Algorithm ◽  
Equations Of Motion ◽  
Joint Space ◽  
Kinematic Chains ◽  
Spatial Linkages ◽  
Dynamic Computer Simulation ◽  
The Stability ◽  
Coordinate Partitioning ◽  
Generalized Coordinate

Abstract A new method of formulating the generalized equations of motion for simple-closed (single loop) spatial linkages is presented in this paper. This method is based on the generalized principle of D’Alembert and the use of the transformation Jacobian matrices. The number of the differential equations of motion is minimized by performing the method of generalized coordinate partitioning in the joint space. Based on this formulation, a computational algorithm for computer simulation the dynamic motions of the linkage is developed, this algorithm is not only numerically stable but also fully exploits the efficient recursive computational schemes developed earlier for open kinematic chains. Two numerical examples are presented to demonstrate the stability and efficiency of the algorithm.

Seismic stability analyses of reinforced tapered landfill cover systems considering seepage forces

2018 ◽  
Vol 36 (4) ◽  
pp. 361-372 ◽  
Author(s):  
Afshin Khoshand ◽  
Ali Fathi ◽  
Milad Zoghi ◽  
Hamidreza Kamalan
Keyword(s):  
Parametric Study ◽  
Limit Equilibrium ◽  
Practical Method ◽  
Seismic Stability ◽  
Design Parameters ◽  
Cover System ◽  
Landfill Cover ◽  
Cover Systems ◽  
Landfill Cover System ◽  
The Stability

One of the most common and economical methods for waste disposal is landfilling. The landfill cover system is one of the main components of landfills which prevents waste exposure to the environment by creating a barrier between the waste and the surrounding environment. The stability and integrity of the landfill cover system is a fundamental part of the design, construction, and maintenance of landfills. A reinforced tapered landfill cover system can be considered as a practical method for improving its stability; however, the simultaneous effects of seismic and seepage forces in the reinforced tapered landfill cover system have not been studied. The current paper provides a solution based on the limit equilibrium method in order to evaluate the stability of a reinforced tapered landfill cover system under seismic and seepage (both horizontal and parallel seepage force patterns) loading conditions. The proposed analytical approach is applied to different design cases through parametric study and the obtained results are compared to those derived from literature. Parametric study is performed to illustrate the sensitivity of the safety factor (FS) to the different design parameters. The obtained results reveal that parameters which describe the geometry have limited effects on the stability of the landfill cover system in comparison to the rest of the studied design parameters. Moreover, the comparisons between the derived results and available methods demonstrate good agreement between obtained findings with those reported in the literature.

New Methodology for the Determination of the Vertical Center of Gravity of In-Service Semisubmersibles: Proposal and Numerical Assessment

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Ivan N. Porciuncula ◽  
Claudio A. Rodríguez ◽  
Paulo T. T. Esperança
Keyword(s):  
Accurate Determination ◽  
Center Of Gravity ◽  
Practical Implementation ◽  
Numerical Assessment ◽  
Neutral Equilibrium ◽  
Inclination Angles ◽  
Numerical Tools ◽  
The Stability ◽  
Metacentric Height

Along its lifetime, an offshore unit is subjected to several equipment interventions. These modifications may include large conversions in loco that usually are not adequately documented. Hence, the accurate determination of the platform's center of gravity (KG) is not possible. For vessels with low metacentric height (GM), such as semisubmersibles, Classification Societies penalize the platform's KG, inhibiting the installation of new equipment until an accurate measurement of KG is provided, i.e., until an updated inclining test is performed. For an operating semisubmersible, the execution of this type of test is not an alternative because it implies in removing the vessel from its in-service location to sheltered waters. Relatively recently, some methods have been proposed for the estimation of KG for in-service vessels. However, as all of the methods depend on accurate measurements of inclination angles and, eventually, on numerical tools for the simulation of vessel dynamics onboard, they are not straightforward for practical implementation. The objective of the paper is to present a practical methodology for the experimental determination of KG, without the need of accurate measurements of inclinations and/or complex numerical simulations, but based on actual operations that can be performed onboard. Indeed, the proposed methodology relies on the search, identification, and execution of a neutral equilibrium condition where, for instance, KG = KM. The method is exemplified using actual data of a typical semisubmersible. The paper also numerically explores and discusses the stability of the platform under various conditions with unstable initial GM, as well as the effect of mooring and risers.

scholarly journals Analysis of conditions and criteria for shock pulse reproducibility on mechatronic test stands

2021 ◽  
pp. 41-45
Author(s):  
A. K. Vasiliev ◽  
◽  
V. A. Dyachenko ◽  
Keyword(s):  
Product Development ◽  
Impact Testing ◽  
Shock Pulse ◽  
Repeated Impact ◽  
Functional Parameters ◽  
Air Suspension ◽  
The Stability

Repeated impact testing is an important part of any product development. The tests are carried out on stands of repeated blows. In order to expand the range of functional parameters of mechatronic stands of multiple blows, the following are proposed: criteria for choosing the parameters of an air suspension, a method for predicting changes in the stiffness of a shaper during stand operation, and a method for assessing the effect of the reproducibility of controlled parameters on the stability of a shock pulse. In contrast to the known works, the proposed criteria and methods take into account the requirements for the reproducibility of the shock impulse

Analysis of effect of center of gravity change towards type M1 vehicle stability

2021 ◽  
Author(s):  
Maulana Triananda ◽  
Danardono A. Sumarsono ◽  
Fuad Zainuri ◽  
Fadhil Aditya Falah ◽  
Faris Arrafi ◽  
...  
Keyword(s):  
Center Of Gravity ◽  
Gravity Change ◽  
Vehicle Stability

scholarly journals Stability and Convergence Analysis of Direct Adaptive Inverse Control

Complexity ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Muhammad Shafiq ◽  
Muhammad A. Shafiq ◽  
Hassan A. Yousef
Keyword(s):  
Computer Simulation ◽  
Convergence Analysis ◽  
Indirect Method ◽  
Stability And Convergence ◽  
Adaptive Inverse Control ◽  
Inverse Control ◽  
Simulation Results ◽  
The Stability ◽  
Feed Forward Controller ◽  
Physical Plants

In adaptive inverse control (AIC), adaptive inverse of the plant is used as a feed-forward controller. Majority of AIC schemes estimate controller parameters using the indirect method. Direct adaptive inverse control (DAIC) alleviates the adhocism in adaptive loop. In this paper, we discuss the stability and convergence of DAIC algorithm. The computer simulation results are presented to demonstrate the performance of the DAIC. Laboratory scale experimental results are included in the paper to study the efficiency of DAIC for physical plants.

Influence of the Ballast Tanks Loading on the Allowable VCG in Damage Case

2006 ◽  
Author(s):  
Guilherme Rueda ◽  
Bruno Madella ◽  
Kazuo Nishimoto ◽  
Fabio Matsumoto
Keyword(s):  
Gulf Of Mexico ◽  
Loading Condition ◽  
Center Of Gravity ◽  
Offshore Platforms ◽  
Single Variable ◽  
Ridge Area ◽  
Ballast Tanks ◽  
Study Case ◽  
The Stability

The aim of this paper is the study of the Allowable VCG in monocolumn offshore platforms. As study case the MonoBR — an innovative conceptual unit developed by a partnership of PETROBRAS/CENPES and University of Sa˜o Paulo — was analyzed. The studies were carried out during the design of MonoBR for the Walker Ridge area, Gulf of Mexico. The effect on the stability of the unit caused by a damaged tank depends on its loading condition, since there is lost of both, buoyancy and mass, modifying unit’s displacement and center of gravity. In other words, depending of the tank loading, the amount of water that enters or leaves the unit in a damage case may vary widely. In this paper is presented the methodology adopted in the study of influence of the ballast tanks loading in the Allowable VCG curve in MonoBR, introducing this other variable beyond the draft, the usual single variable in AVCG curves. At the end are presented the main results for the study case, whose AVCG can vary by 50% for the same draft depending of the tank loading.

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