scholarly journals A case study on vibration control in a boring bar using particle damping

2012 ◽  
Vol 3 (8) ◽  
Author(s):  
M Senthil kumar ◽  
KM Mohanasundaram ◽  
B Sathishkumar
Keyword(s):  
Vibration Control ◽  
Boring Bar ◽  
Particle Damping

scholarly journals Application of Self Mass Damper in multi-story concrete building

2019 ◽  
Vol 258 ◽  
pp. 05006
Author(s):  
Dina Rubiana Widarda ◽  
Maria Yvonne Hidajat
Keyword(s):  
Vibration Control ◽  
Dynamic Performance ◽  
Building Design ◽  
Dynamic Responses ◽  
Ground Acceleration ◽  
Passive Vibration Control ◽  
Mass Damper ◽  
Concrete Building ◽  
Use Efficiency

Comfort is one among several aspects in building design. Comfort of the occupant can be measured from the dynamic performance of the building during earthquake. This performance can be increased by installing vibration control to reduce dynamic responses of the building. Considering the space-use efficiency, the building is utilizing certain floors to act as mass dampers. The floors are able to move back and forth independently to counter building vibration. Utilizing an existing floor slab as a mass damper is known as passive vibration control or in particularly named self mass damper (SMD). A 14-story reinforced concrete building is modeled as a case study. The movable floor placement is varied in 3 configurations. The modeled building is excited by El Centro 1940 and Denpasar 1979 ground accelerations, independently. The study compares the dynamic responses of building without SMD and with SMD in three different placements. Placing SMD in 4 top floors (13th,12th, 11th, 10th) gives the best result in reducing building’s dynamic response compared to SMD in 4 mid-height floors (11th,10th, 8th, 7th) or separate group (13th, 12th, 6th, 5th). It is shown that the building has a tendency to response conforming 1st mode of the building. From the analysis, it can be concluded that applied SMD system gives greater reduction on building’s displacement, velocity, and acceleration in response to Denpasar ground acceleration rather than El Centro 1940.

Case study: An improvement study of damping ring applied to wheel noise and vibration control

2019 ◽  
Vol 67 (2) ◽  
pp. 127-139
Author(s):  
Zhonglong Wang ◽  
Yinghou Jiao ◽  
Zhaobo Chen
Keyword(s):  
Vibration Control ◽  
Noise And Vibration

Variable Stiffness Spring Using Tensegrity Prisms

2010 ◽  
Vol 2 (4) ◽  
Author(s):  
Mojtaba Azadi ◽  
Saeed Behzadipour ◽  
Gary Faulkner
Keyword(s):  
Mathematical Model ◽  
Vibration Control ◽  
Force Control ◽  
Variable Stiffness ◽  
Noise And Vibration ◽  
Tensegrity Structures ◽  
Tensegrity Structure ◽  
Engine Mount

A novel variable stiffness mechanism (i.e., variable spring) based on the concept of tensegrity structures is presented. Variable springs have extensive applications in noise and vibration control. The proposed method builds upon the prestress stiffness in tensegrities, which occurs along infinitesimal mechanisms and is fully controllable through force control in the members. A criterion is given to select a suitable tensegrity structure and an infinitesimal mechanism to develop a variable spring. Also, a mathematical model is developed for the stiffness components in an n-gon tensegrity prism. The variable components of the stiffness are then utilized to create a translational or rotational variable spring. In order to elaborate on the feasibility of the concept, a case study is presented on the engine mount of a vehicle. Parameters of a possible design of a variable stiffness mount are given, and the characteristics are compared with those of a conventional passive mount. This is followed by a detailed discussion on the properties of such a variable spring and the effects of various parameters.

A novel composite vibration control method using double-decked floating raft isolation system and particle damper

2017 ◽  
Vol 24 (19) ◽  
pp. 4407-4418 ◽  
Author(s):  
Xiaofei Lei ◽  
Chengjun Wu ◽  
Hengliang Wu
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Structural Characteristics ◽  
Resonance Method ◽  
Simulation Technique ◽  
Impedance Method ◽  
Isolation System ◽  
Floating Raft ◽  
Particle Damping ◽  
Particle Dampers

This paper presents a composite vibration control method that uses a double-decked floating raft isolation system and particle dampers to control the severe vibration of a heavy compressor set. In view of the structural characteristics of the compressor set, a mechanical impedance method is employed to investigate the acceleration transfer ratios of the double-decked floating raft isolation system, and to design three isolating schemes. Numerical results indicate that the particle damping technology does not disturb the isolating performance of the double-decked floating raft isolation system while reducing only its acceleration amplitude. To improve the damping performance of particle dampers, an anti-resonance method and a co-simulation technique are used to optimize the installation location of the particle dampers, as the damping effect is related to the vibrating velocity at the damper’s position. Furthermore, two types of particle damper—cylindrical and cuboid—are designed, based on conclusions drawn from experiments using the anti-resonance method. The damping effectiveness of the particle damper scheme is also examined using the co-simulation technique; results indicate that the proposed installation scheme can effectively suppress the vibration of the compressor rack. In addition, the presented schemes using the composite vibration control method are verified and compared in on-site experiments, and results demonstrate that the third isolating scheme presented, combined with particle damping technology, is best in controlling vibration of the compressor set.

scholarly journals Investigating the Cutting Force Monitoring System in the Boring Process

2021 ◽  
Author(s):  
Qiang Liu ◽  
Dayong Gao ◽  
Ruhong Jia ◽  
Qiang Zhou ◽  
Zhengyan Bai
Keyword(s):  
Cutting Force ◽  
Monitoring System ◽  
Piezoelectric Effect ◽  
Main Idea ◽  
Boring Bar ◽  
Dynamic Cutting Force ◽  
Voltage Signal ◽  
Force Monitoring ◽  
Closed Environment

Abstract Due to the closed environment during deep hole boring, it is impossible to observe the working state of the boring bar. Studies show that monitoring the cutting force is the most direct and effective way to reflect the processing status. In this regard, a cutting force monitoring system is designed in the present study for the boring process. The main idea of the designed monitoring system is the piezoelectric effect of the strain gauge. When the tool tip is subjected to the cutting force, the sensor deforms and the strain sensor generates a voltage signal. Accordingly, the cutting force can be obtained by establishing the correlation between the voltage and the applied cutting force. The force of the boring bar and the output of the sensor were analyzed, and an experimental platform for monitoring the boring force was built. This method is applied in a case study and the obtained results demonstrate that the developed cutting force monitoring system has good compatibility, high precision and good dynamic characteristics. It is found that that the measurement error of the designed system in the boring process is less than 9.18%, which meets the accuracy requirements of measurements in the dynamic cutting force under machining conditions.

Alternative to traditional systems of vibration control of rotating machinery

2005 ◽  
Vol 219 (1) ◽  
pp. 27-42
Author(s):  
R. D. Ambrosini ◽  
R. O. Curadelli ◽  
R. F. Danesi
Keyword(s):  
Dynamic Analysis ◽  
Vibration Control ◽  
Control Systems ◽  
Numerical Study ◽  
Rotating Machinery ◽  
Acceleration Response ◽  
Support Structure ◽  
Vibration Absorption ◽  
Alternative Systems

The main objective of this paper is the comparison between the efficiency of vibration control systems of rotating machinery, in order to present alternatives for the cases in which it is not possible or convenient to use traditional systems. Moreover, the formulation of the theoretical dynamic load that should be used in the dynamic analysis is discussed. An experimental and numerical study is presented considering as an alternative system of vibration absorption the incorporation of masses on the support structure. Masses of 5, 10, and 15 per cent of the total mass of the vibrating machinery are included in the analysis. A set of tests about a case study on the spring (traditional) and built-in masses (alternative) systems is presented. Moreover, a linear dynamic analysis of the models with a finite element code was carried out. The behaviour of the built-in masses system is very good, reducing the acceleration response on the support structure to levels comparable to traditional systems.

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