scholarly journals Effectiveness Comparison of Supporting Surfaces in The Ball System for Vibration Isolation of High-Rise Buildings

2020 ◽  
Vol 8 (3) ◽  
pp. 5-11
Author(s):  
Ol'ga Burtseva ◽  
Svetlana Chipko ◽  
Nana Abuladze
Keyword(s):  
Mechanical System ◽  
Vibration Isolation ◽  
Dynamic Equations ◽  
High Rise ◽  
System A ◽  
Homogeneous Ball ◽  
Harmonic Perturbation ◽  
Support Surfaces

The mechanical system «a hard homogeneous ball» between the movable upper and lower supports is considered. Its dynamic equations by plane motions are obtained under the action of an external harmonic perturbation. Various cases of support surfaces are considered.

scholarly journals Basic Passive Side-Day lighting Considerations for High Rise office Building

2020 ◽  
Vol 9 (5) ◽  
pp. 78-87
Keyword(s):  
Energy Consumption ◽  
Construction Industry ◽  
Positive Impact ◽  
Building Design ◽  
High Energy ◽  
Office Building ◽  
High Rise ◽  
Design Considerations ◽  
System A ◽  
Modern Era

High rise office building design is one of the essential buildings in construction industry due to the limited space especially in the urban area. After home, a high rise office building is an important space for human in modern era. Due to the issue of high energy consumption especially inefficient artificial light strategy, side-day lighting becomes the best solution for a high rise office building design. Despite providing efficient energy consumption, side-day lighting creates a positive impact to the worker as well as the office's indoor environment. Hence, this paper aims to explore the basic passive side-day lighting considerations that educate people especially for those who are involved in the building construction industry. Beside, this paper focuses on the passive design considerations due to the various advantages that not involved especially with complex electrical and mechanical system. A systematic literature review is the main methodology for this paper to identify the basic passive side-day lighting considerations for a high rise office building design. Base on this research, it revealed that eight elements for building design considerations should be applied to provide a better day lighting impact for a high rise office building design. Considerations for non-building design aspects should also need to be applied since those aspects contribute to produce a better day lighting impact for a high rise office building design.

Estimation of the Largest Lyapunov Exponent of Discontinuous Systems Using Chaos Synchronization

1999 ◽  
Author(s):  
Andrzej Stefanski ◽  
Jerzy Wojewoda ◽  
Tomasz Kapitaniak ◽  
John Brindley
Keyword(s):  
Lyapunov Exponent ◽  
Mechanical System ◽  
Dry Friction ◽  
Chaos Synchronization ◽  
Largest Lyapunov Exponent ◽  
Discontinuous Systems ◽  
System A ◽  
The Largest Lyapunov Exponent

Abstract Properties of chaos synchronization have been used for estimation of the largest Lyapunov exponent of a discontinuous mechanical system. A method for such estimation is proposed and an example is shown, based on coupling of two identical systems with dry friction which is modelled according to the Popp-Stelter formula.

Development of V-Shaped Hybrid Mass Damper and its Application to High-Rise Buildings

1995 ◽  
Author(s):  
Masanori Imazeki ◽  
Koji Tanida ◽  
Masao Mutaguchi ◽  
Yuji Koike ◽  
Tamotsu Murata ◽  
...  
Keyword(s):  
First Year ◽  
Building Structures ◽  
Large Space ◽  
Natural Period ◽  
High Rise ◽  
High Rise Building ◽  
System A ◽  
Mass Damper ◽  
Story Building ◽  
Auxiliary Mass

Abstract A hybrid mass damper system has been developed with a view to counteracting wind- and earthquake-excited vibrations of large high-rise building structures. In order to eliminate the large space needed to accommodate a pendulum-type mass damper adapted to the long period of high-rise building, mechanism has been devised for suspending the auxiliary mass on a V-shaped rail sliding on rollers. The base angle of the V-shaped rail is varied for adjusting the natural period of the mass damper system. A suboptimal algorithm based on the minimum norm method has been adopted for designing the auxiliary mass driving system. Three units of this damper system, each equipped with auxiliary mass weighing 110 tons, have been installed on a 52-story building. Satisfactory performance conforming in all practical aspects with design has been verified from vibration test on actual building after installation. As sequel, the functioning of the system during the first year of service is also reported.

Shaft Instabilities in Two-Stage Gear Systems

2013 ◽  
Vol 275-277 ◽  
pp. 930-935
Author(s):  
Zhe Rao ◽  
Chun Yan Zhou
Keyword(s):  
Multiple Scale ◽  
Gear System ◽  
Dynamic Equations ◽  
Time Varying ◽  
Kutta Method ◽  
Two Stage ◽  
Scale Method ◽  
System A ◽  
Runge Kutta Method ◽  
Intermediate Shaft

The present paper is focused on the torsional instabilities of the intermediate shaft in a two stage gear system. A theoretical model is established taking account in the torsional flexibility of the intermediate shaft and the meshing time-varying stiffness of the gears. Multiple scale method is applied to analysis the instability areas of the gear system for which the generalized modal coordinate is adopted. The result is certificated by numerical integrals of the dynamic equations by Runge-Kutta Method.

Dynamic Analysis of Multi-Supported Nonlinear Vibration Isolation System Mounted on Flexible Foundation

2013 ◽  
Vol 419 ◽  
pp. 223-227 ◽  
Author(s):  
Rui Huo ◽  
Hui Yu ◽  
Yan Feng Guan
Keyword(s):  
Numerical Solution ◽  
Nonlinear Vibration ◽  
Power Flow ◽  
Vibration Isolation ◽  
Engineering Application ◽  
System Dynamic ◽  
Dynamic Equations ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Flexible Foundation

In view of its prototype in engineering application, a theoretical model of multi-supported nonlinear vibration isolation system installed on flexible foundation is studied, including derivation of system dynamic equations and analysis of system dynamic characteristics. For effectiveness evaluation of nonlinear vibration isolation systems, a generalized time-averaged power is proposed as an extension of classical theory of vibratory power flow, and a numerical solution method of time-averaged power is probed accompanying with the numerical solution of nonlinear dynamic equations. In a further concrete calculation example, an air spring vibration isolation system of a small UAV engine is numerically simulated based on Runge-Kutta method, and dynamic behavior and power flow transmission characteristics influenced by system parameters are investigated.

scholarly journals Assessment of vibration isolation in «Flexible connector–pipeline–vibration isolators Pendants» mechanical system

2020 ◽  
pp. 9-14
Author(s):  
Yu. A. Burian ◽  
◽  
A. V. Zubarev ◽  
S. N. Polyakov ◽  
◽  
...  
Keyword(s):  
Mechanical System ◽  
Vibration Isolation ◽  
Mechanical Resistance ◽  
Vibration Source ◽  
Vibration Isolators ◽  
Vibration Load ◽  
System Parameters ◽  
Radiated Power ◽  
Pipeline Vibration ◽  
Pumping Units

When designing pipeline systems, the question of reducing the vibration load transmitted from vibroactive elements (pumping units, compressors, etc.) through the pipelines to the base almost always arises. In this case, as a rule, when laying pipes, one end is connected to a vibration source through flexible elements (bellows, elastic compensators, pipes). The pipeline is installed on hangers with vibration dampers. The paper considers the issues of calculating the mechanical resistance of flexible connectors, pipelines and vibration isolators of suspensions, as well as analytical dependences and the results of numerical calculation of the forces transmitted to the base and the radiated power depending on the frequency. The graphic materials show the frequency characteristics of the forces on the base and vibration power, depending on the considered mechanical system parameters

Modeling and Imaging Mechanical Chaos

2005 ◽  
Author(s):  
Mike Bailley
Keyword(s):  
Mechanical System ◽  
Chaotic System ◽  
Chaotic Systems ◽  
Initial Conditions ◽  
Complex Nature ◽  
Dynamics Modeling ◽  
System A

The word “chaotic system” [Peitgen92] describes a system whose outputs are very sensitive to its initial conditions. Because of their inherent complex nature, chaotic systems are difficult to visualize and understand. This paper describes the visualization of a mechanical chaotic system — a magnetic pendulum. The program uses dynamics modeling and imaging, so that a user can experiment with different configurations and then visualize how that configuration responds to all input conditions. The result shows interesting patterns and insights into the mechanical system itself. This same technique would be applicable to visualizing many other chaotic systems.

Protection of Bearing Structures of Buildings Against the Influence of Vibration Generated by Railway Transport

2020 ◽  
pp. 40-46
Author(s):  
V.A. Smirnov ◽  
◽  
Keyword(s):  
Vibration Isolation ◽  
Rail Transport ◽  
Design Stage ◽  
Vibration Level ◽  
Railway Transport ◽  
Railway Network ◽  
High Rise ◽  
Acoustic Comfort ◽  
Vibration Impact ◽  
Pass Through

Currently, the railway network is widely developed, many of which pass through settlements and cities; in some proximity to buildings, including high-rise buildings. The movement of trains on the track causes a certain level of vibrations that are transmitted through the ground to nearby buildings, and cause vibrations of various structures. In this regard, when designing railway tracks or constructing buildings in some proximity to railways, it is necessary to assess the possible vibration impact of rail transport on structures at the design stage and, if necessary, provide measures to protect buildings from negative vibration effects. However, to date, there has not been a standardized method for determining the vibration level at the design stage. The method of predicting the vibration impact of railway transport presented in the article will make it possible to estimate the degree of vibration impact of railway transport on buildings and structures at the design stage, and, if necessary, develop design solutions for vibration isolation that protect buildings and structures from negative vibration effects and create acoustic comfort conditions in the premises.

A NOVEL METHOD TO SIMULATE FORCE-CHEST DISPLACEMENT RELATIONSHIP DURING CARDIOPULMONARY RESUSCITATION

2011 ◽  
Vol 23 (06) ◽  
pp. 519-526
Author(s):  
Xinwu Xie ◽  
Gaofeng Wei ◽  
Rui Liu ◽  
Qiuming Sun ◽  
Aijuan Ni ◽  
...  
Keyword(s):  
Cardiopulmonary Resuscitation ◽  
Mechanical System ◽  
Piecewise Linear ◽  
Variable Stiffness ◽  
Simulation Method ◽  
Piecewise Linear Function ◽  
Hysteresis Curve ◽  
System A ◽  
Novel Method ◽  
The Relationship

Survival from cardiac arrest is dependent on timely cardiopulmonary resuscitation (CPR). Experimental and modeling work had shown that the relationship between compression force and sternal displacement had a tendency of hysteresis curve, which in manikins was rather lineal. A novel method was introduced to improve the mechanical characteristics of the manikins using a variable-stiffness springs group-damper structure, in which the spring's group and the damper simulate the elastic and damping of human chest respectively. To do the simulation, the model of the human chest's mechanical during CPR based on Gruben's pre-result was modified and the elastic part was fitted by piecewise linear function to get the springs' stiffness. The variable-stiffness springs group system was designed accordingly to simulate the human chest' stiffness during CPR, and a damper was designed to simulate the damping of chest. The damper and the variable-stiffness springs group were paralleling combined, forming a mechanical system. A sample system was realized and the test results showed that there were nonlinear elasticity and adequate viscosity in this system, whose coefficients were adjacent to Gruben's 'typical' human. According to the method, the mechanical system could be changed to accurately simulate different models, and its stiffness could be easily adjusted by varying the interval between the nest springs' top. The simulation method could be used directly in manikin, whose mechanical character would be improved and then more adequate training would be provided.

Wrist Rehabilitation Device Using Pneumatic Parallel Manipulator Based on EMG Signal

2011 ◽  
Vol 5 (4) ◽  
pp. 472-477 ◽  
Author(s):  
Masahiro Takaiwa ◽  
◽  
Toshiro Noritsugu ◽  
Norimichi Ito ◽  
Daisuke Sasaki
Keyword(s):  
Mechanical System ◽  
Frequency Analysis ◽  
Parallel Manipulator ◽  
Joint Angle ◽  
Wrist Joint ◽  
Training Method ◽  
Wrist Motion ◽  
Muscle Strengthening ◽  
System A ◽  
Emg Signal

In this study, we focus on a rehabilitation motion of human wrist joint and aim at supporting these rehabilitation training by introducing a mechanical system. A pneumatic parallel manipulator is introduced since it can drive enough D.O.F to correspond to a wrist motion and has inherent compliance characteristics resulted from air compressibility. We propose a new training method for a muscle strengthening training based on ElectroMyoGraphy (EMG), where a payload is set between joint angle and the muscle we want to train directly. In addition, we propose a method to detect muscle fatigue based on a frequency analysis of EMG. The effectiveness of the proposed method is confirmed through some experiments.

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