scholarly journals Influence of a Vibration Isolation System on Planar Dynamics of a Motorcycle

2020 ◽  
Vol 25 (1) ◽  
pp. 96-103
Author(s):  
Sudhir Kaul
Keyword(s):  
Simple Model ◽  
Design Process ◽  
Dynamic Characteristics ◽  
Vibration Isolation ◽  
Ride Comfort ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Natural Modes ◽  
The Impact ◽  
Unsprung Mass

This paper examines a model to investigate the impact of a vibration isolation system on the planar (in-plane) dynamics of a motorcycle. While it is not very common, a vibration isolation system is used in some motorcycles to mitigate vibrations resulting from the shaking forces of the engine. For such layouts, the powertrain is assembled to the frame through the vibration isolation system that typically consists of two to four isolators. It is critical to comprehend the influence of the isolation system on the overall dynamic characteristics of the motorcycle due to the coupled dynamics of the rear suspension, the isolation system, and the rear unsprung mass. The influence of a vibration isolation system on the in-plane dynamics is analysed by using a relatively simple model that has been developed in this study. This model has been used to evaluate the influence of the isolation system on natural modes, transmissibility, and ride comfort. Results indicate that the use of a vibration isolation system couples the rear unsprung hop to the pitch motion of the powertrain with a slight increase in the corresponding natural frequency. Results indicate that the use of a vibration isolation system directly affects handling of the motorcycle. Furthermore, results indicate that the pitch of the sprung mass and the hop of the rear unsprung mass are particularly influenced by the vibration isolation system. The model presented in this paper could be useful in the early stages of the design process to compare the rigidly mounted powertrain to different layouts of the vibration isolation system.

A Vibration Study of a Hydraulically-Actuated Legged Machine

2010 ◽  
Author(s):  
Emanuele Guglielmino ◽  
Ferdinando Cannella ◽  
Claudio Semini ◽  
Darwin G. Caldwell ◽  
Nestor Eduardo Nava Rodri´guez ◽  
...  
Keyword(s):  
Vibration Isolation ◽  
Legged Robot ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Hydraulically Actuated ◽  
Modes Of Vibration ◽  
Pros And Cons ◽  
Heavy Loads ◽  
Multi Body ◽  
The Impact

This paper presents a study on the impact of the vibration on a hydraulically-actuated legged robot designed for outdoor operations. The choice of using hydraulic actuation in lieu of electric actuation as is common in robotics has been driven by the need to cope with heavy loads and respond swiftly to external inputs and disturbances. However in such machines hydraulically-induced vibration (fluid borne noise and structure borne noise) is a major issue. Volumetric pumpmotor assembly is a primary cause of vibration. These are transmitted to the robotic structure, which has been designed as light as possible to minimise the robot’s total weight and power consumption and make it more agile. Initially a multi-body analysis of the robot was carried out to select an appropriate vibration isolation system. Subsequently a numerical and experimental modal analysis was carried out on the structure. The latter was carried with modal hammer tests and pump running tests. This has allowed identifying the main modes of vibration of the structure. The pros and cons of this approach are described and areas of improvements identified.

STUDY OF THE VIBRATION ISOLATION SYSTEM OF MARINE POWER PLANTS WITH A 5AL 25/30 DIESEL DRIVE

Akustika ◽  
2021 ◽  
pp. 112
Author(s):  
Minas Minasyan ◽  
Armen Minasyan ◽  
Kyaw Thet Naing
Keyword(s):  
Experimental Study ◽  
Diesel Engine ◽  
Power Plants ◽  
Vibration Isolation ◽  
Field Studies ◽  
Absorption System ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Vibration Isolators ◽  
The Impact

The article is devoted to the study of the support and side stop vibration isolation system of two marine power plants DGA- 500 with a 5AL 25/30 drive diesel engine, in which a hypothesis is put forward about the imperfection of the shock absorption system. The purpose of the research is to substantiate the imperfection of the support and side stop vibration isolation system of marine power plants with a 5 AL 25/30 drive diesel engine. The confirmation of this hypothesis and the achievement of this goal is justified on the basis of presentation of the results of field studies on the project’s courts B437/11 and the personal presence during the preparation of DGA-500 to repair at the shipyard. For the use of unbalanced engines as a drive for ship power plants, the authors, on the basis of a full-scale experimental study and analysis of known works, recommend initially assessing the possibility and purpose of depreciation of the unit according to the Katz unbalance criterion [1]. The objective of fixing the unit with diesel 5AL 25/30 on the criterion of imbalance Katz is soundproof, and the calculation of depreciation should be based on the impact of side stop vibration isolators. A significant improvement is recommended to the support 36-40 and side stop 41-52 vibration isolation system, elastic pipe fittings 8, support frame 2 and turbocharger bracket 4 (Fig. 1).

scholarly journals Planar Dynamics of a Motorcycle: Influence of Vibration Isolation System Nonlinearity

2020 ◽  
Vol 25 (4) ◽  
pp. 597-608
Author(s):  
Sudhir Kaul
Keyword(s):  
Vibration Isolation ◽  
Ride Comfort ◽  
Spatial Dynamics ◽  
Linearization Method ◽  
Statistical Linearization ◽  
Coupled Dynamics ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Nonlinear Design ◽  
System Nonlinearity

This paper investigates the influence of the nonlinearities of a vibration isolation system on the planar dynamics of a motorcycle. The use of a nonlinear isolation system is often necessitated by design and packaging constraints. Although the use of a vibration isolation system is uncommon in motorcycles, it is used in some cases to enhance ride comfort by mitigating vibrations transmitted to the rider due to shaking forces. In such cases, the handling of the motorcycle can be influenced due to the coupled dynamics of the rear unsprung mass and the swing arm. In this paper, a stochastic analysis has been performed by using the statistical linearization method to specifically examine nonlinearities associated with the vibration isolation system. An eight degree-of-freedom planar model has been developed, and each isolator is represented by a modified multi-axial Kelvin-Voigt model. It has been observed that the model developed in this study can capture the coupled dynamics between the rear suspension and the vibration isolation system. Results indicate that the nonlinear design of the vibration isolation system can be useful in enhancing ride comfort in the lower frequency range without an adverse impact on handling. Furthermore, it has been observed that the parameters associated with the nonlinear vibration isolation system can be tuned to enhance ride comfort while meeting the design requirements of spatial dynamics.

Study on Ambulance Stretcher Vibration Isolation System

2012 ◽  
Vol 226-228 ◽  
pp. 324-327 ◽  
Author(s):  
Gong Yu Pan ◽  
Ying Zhang
Keyword(s):  
High Speed ◽  
Vibration Isolation ◽  
Ride Comfort ◽  
Angular Acceleration ◽  
Mathematic Model ◽  
Vertical Acceleration ◽  
Active System ◽  
Linear Quadratic ◽  
Isolation System ◽  
Vibration Isolation System

The ride comfort is one of the most important performances of the ambulance. In order to avoid patients' illness or injury to deteriorate during the transportation, the ambulance is required to hold smooth motion and high speed. Therefore, it is necessary to develop stretcher vibration isolation system to improve ambulance ride comfort. In this paper, a mathematic model of six degree freedom ambulance-stretcher-occupant system is established. Based on the theory of linear quadratic optimal control, the linear quadratic regulator (LQR) controller of active ambulance stretcher is designed. The simulation results indicate that the active system equipped with the optimal controller has better vibration reduction perfomance on vertical acceleration and pitch angular acceleration of the ambulance stretcher.

scholarly journals A Synthesis Model for Forcing Action Arrangement in the System of Reducing Dynamic Loads of a Mobile Machine

2015 ◽  
Vol 20 (2) ◽  
pp. 437-443 ◽  
Author(s):  
H. Kaźmierczak ◽  
T. Pawłowski ◽  
K. Zembrowski
Keyword(s):  
Analytical Model ◽  
Dynamic Characteristics ◽  
Vibration Isolation ◽  
Dynamic Loads ◽  
Dynamic Susceptibility ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Supporting Structure ◽  
System Vibration ◽  
Mobile Machine

Abstract An idea is presented for a method to lower excessive dynamic loads in the system of supporting structure, mechanical-hydraulic forcing system, vibration isolation system, protective unit. The dynamic characteristics of the system are determined by the method of dynamic susceptibility. An analytical model of the system was built (mobile machine to carry out protective treatments; project WDN-POIG.01.03.01-00-164/09).

scholarly journals Dynamic research on a low-frequency vibration isolation system of quasi-zero stiffness

2019 ◽  
Vol 38 (2) ◽  
pp. 684-691
Author(s):  
M Jurevicius ◽  
V Vekteris ◽  
G Viselga ◽  
V Turla ◽  
A Kilikevicius ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Vibration Isolation ◽  
Acoustic Noise ◽  
Low Frequency ◽  
Experimental Tests ◽  
Theoretical Research ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Low Frequency Vibration ◽  
Conditioning Equipment

The paper describes an establishment of dynamic characteristics of the newly created passive mechanical system for isolation of low-frequency (0.7 Hz–50 Hz) vibrations. The many metrological means are sensitive to mechanical vibrations and acoustic noise of low frequency. Such may appear both outside and inside a building, i.e. may be caused by wind, heating, aeration, air conditioning equipment, moving vehicles and other. In the paper, description of the theoretical and experimental tests is provided. The obtained dynamic characteristics (transmissibilities) of the passive mechanical low-frequency vibration isolation system show that such a system is able to isolate vibrations effectively in the frequency range of 0.7 Hz–50 Hz. The results of the experimental tests support the results of the theoretical research.

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