thumb thumb

A Novel Vibration Control System Applying Annularly ...

Multiple Launch Rocket System (MLRS) has been widely used in recent years; vibration control in launching process is an effective way to improve its dispersion characteristics. In this paper, a novel vibration control system applying Annularly Arranged Thrusters (AAT) for MLRS in launching process is introduced and the prototype of the proposed system is built.

thumb thumb

Structural Vibration Analysis of Electronic Equipment for ...

The impulse between the launch vehicle and the atmosphere can generate a lot of noise and vibration during the process of launching a satellite, hi this situation, random vibrations can cause the ...

thumb thumb

Modeling and Dynamic Analysis of Spherical Roller Bearing ...

Since spherical roller bearings can carry high load in both axial and radial direction, they are increasingly used in industrial machineries and it is becoming important to understand the dynamic behavior of SRBs, especially when they are affected by internal imperfections. This paper introduces a dynamic model for an SRB that includes an inner and outer race surface defect.

thumb thumb

Vibration fatigue dynamic stress simulation under non ...

Second, in dynamic stress simulation, vibration fatigue needs to consider the modal parameters of the structure and the influence of structural dynamic characteristics on deformation,, but traditional fatigue simulation mainly considers structural stiffness, that is, Hooke's law principle. But, S-N curves and cumulative damage approach are ...

thumb thumb

Small-Bore Connections (SBC) Assessment | Vibration ...

Piping vibration and fatigue can account for up to 20% of hydrocarbon releases; and a large portion of those are due to failure of small-bore connections per Energy Institute, 2008, Guidelines for the avoidance of vibration-induced fatigue failure, (AVIFF).Hydrocarbon emissions can lead to fire, explosions, injuries, property and environmental damage, and penalties.

thumb thumb

Impulse excitation technique - Wikipedia

The impulse excitation technique (IET) is a non-destructive material characterization technique to determine the elastic properties and internal friction of a material of interest. It measures the resonant frequencies in order to calculate the Young's modulus, shear modulus, Poisson's ratio and internal friction of predefined shapes like rectangular bars, cylindrical rods and disc shaped samples.

thumb thumb

(PDF) Analysis of the Vibration Characteristics of a ...

Analysis of the Vibration Characteristics of a Boring Bar with a Variable Stiffness Dynamic Vibration Absorber Article (PDF Available) in Shock and Vibration 2019(9):1-13 · August 2019 with 109 Reads

thumb thumb

Effect of vibration assistance on chatter stability in ...

Oct 01, 2019· The remaining of this paper is organized as follows: the model of the vibration-assisted milling process in predicting the process dynamics and chatter stability are presented in Section 2. The effects of vibration assistance on instantaneous uncut chip thickness, time delay and chatter stability are simulated and analyzed in Section 3 .

thumb thumb

Shock & Vibration using ANSYS Mechanical

dynamic loads. Helps in calculating solution controls (time steps, etc.) for other dynamic analyses. Recommendation: ecause a structure's vibration characteristics determine how it responds to any type of dynamic load, it is generally recommended to perform a modal analysis first before trying any other dynamic analysis.

thumb thumb

Study on Supporting Structure Performance of Deep Soft ...

Through the simulation analysis of the dynamic effect of wharf construction on the supporting structure, including the hammering vibration load of steel pipe piles and the impact of sand load, the following conclusions are drawn: (1) After the excavation of the wharf, the maximum acceleration of the supporting structure caused by the vibration ...

thumb thumb

Balance, Vibration, and Vibration Analysis

Vibration Vibration analysis is a cost-effective and useful diagnostic tool to ensure smooth running fans. Smaller units may not be vibration tested after assembly because the vibratory energy is much lower and has little impact on the installation or the life of the fan. Vibration is defined as "the alternating mechanical motion of an

thumb thumb

Dynamic analysis of the longitudinal vibration on bottom ...

D YNAMIC ANALYSIS OF THE LONGITUDINAL VIBRATION ON BOTTOM DRILLING TOOLS. C HUNXU Y ANG, R UI H E W ANG, L AIJU H AN, Q ILONG X UE 254 JOURNAL OF V IBROENGINEERING.M ARCH 2020, V OLUME 22, ISSUE 2 2. Mechanical model of longitud inal vibration for BDTs 2.1. Selection and assumptions of the mechanical model There are more than 5 types of longitudinal free vibration …

thumb thumb

Vibration - Wikipedia

Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point.The word comes from Latin vibrationem ("shaking, brandishing"). The oscillations may be periodic, such as the motion of a pendulum—or random, such as the movement of a tire on a gravel road.. Vibration can be desirable: for example, the motion of a tuning fork, the reed in a woodwind instrument or ...

thumb thumb

Dynamics and Vibrations: Notes: Forced Vibrations

5.4 Forced vibration of damped, single degree of freedom, linear spring mass systems. Finally, we solve the most important vibration problems of all. In engineering practice, we are almost invariably interested in predicting the response of a structure or mechanical system to external forcing.

thumb thumb

The multidirectional vibration and coupling dynamics of ...

Jul 08, 2020· For improving the accuracy of wellbore trajectory prediction in complex wellbore structures, especially in the kick-off section, a longitudinal, torsional and radial coupled drill string dynamics model is proposed. At the same time, the coupling dynamics model is solved based on the energy method, and the torque, weight on bit (WOB), the longitudinal displacement and velocity, the torsional ...

thumb thumb

Experimental analysis of dynamic characteristics for ...

Integral shroud is an advanced technique used to improve reliability of steam turbine blades. In this paper, dynamic characteristics of vibration-impact process of steam turbine blades with integral shroud are studied. To test and verify the reliability of calculation result, a series of experiments are well performed on the platform of contracting and impacting of blades tips.

thumb thumb

Vibration Testing (br0227)

in vibration testing and a description GI tne vibration exciters and control equipment used in environmental 1estlng and in determlna,tlmll of dynamic properJies of structures. Introduction Why vibration lesting? How does an exclter work? The power amplifier The exciter control Basic exciter Instrumentation,Sine excitation Random excitation

thumb thumb

Vibration Induced Fatigue Analysis of [0n/90n]s Simply ...

Fatigue analysis of a simply supported composite plate with laminate configuration of [0 n /90 n] s under central patch impulse loading is presented using an analytical method. The method mainly consists of two steps, one, evaluation of vibration induced stresses for the given central patch impulse loading using modal analysis, and two, fatigue analysis using S–N curve approach, residual ...

thumb thumb

Dynamic analysis in a micro drilling process with ...

Hence, the vibration during drilling must be suppressed. This study is to investigate the dynamic analysis of a micro drill under ultrasonic vibration (50 kHz) excited with a piezoelectric-driven actuator experimentally and numerically by using finite element analysis.

thumb thumb

Skid Design and Dynamic Analysis | Vibration, dynamics and ...

Dynamic Skid Analysis. The study is focused on rotating or reciprocating machines. It will assess the vibration and dynamic stress amplitudes in the skid structure and components mounted on the skid to identify if modifications are required. For many packagers, Wood can also help reduce the cost of the skid (Skid Optimization Study).

thumb thumb

NPTEL :: Aerospace Engineering - NOC:Vibration and ...

Sl.No Chapter Name MP4 Download; 1: Lecture 01: Introduction: Download: 2: Lecture 02: Undamped Free Vibration: Download: 3: Lecture 03: Damped Free Vibration: Download

thumb thumb

Experimental analysis of dynamic characteristics for ...

The dynamic strain data under different gaps, different loads and different rotating speeds are surveyed through which the log decrement at each condition is obtained, and the effects of vibration ...

thumb thumb

Vibration Analysis and Signal Processing in LabVIEW - NI

Mar 14, 2019· Since acquisition of acoustic and vibration signals is critical in a variety of industries, NI has combined industry-leading 24-bit dynamic signal acquisition hardware with ready-to-run analysis in NI LabVIEW software to provide a unique solution for prototyping and deploying sound and vibration …

thumb thumb

Vibration Analysis - an overview | ScienceDirect Topics

In Practical Machinery Management for Process Plants, 1999. This chapter focuses on the vibration analysis.Machinery distress very often manifests itself in vibration or a change in vibration pattern. Vibration analysis is, therefore, a powerful diagnostic tool, and troubleshooting of major process machinery would be unthinkable without modern vibration analysis.

thumb thumb

Vibration Testing | Response Dynamics

Dynamic testing is the backbone of all of our work, it is the basis of vibration analysis and Modal Analysis Testing, and the way we show cause & effect in our Diagnostic Testing. Most everyone will tap on an object to determine what it is made of, if its broken and cracked, if its hollow or solid, if its full or half full, hard and resilient ...

thumb thumb

Dynamic response analysis of the rubber shock absorber in ...

The complex impulse environment of the artillery firing process brings very tough vibration attenuation requirement of the artillery-mounted equipment. The experiment is designed to decrease an artillery mounted instrument container's vibration. However, after being equipped with a certain rubber shock absorber, the vibration of this instrument container wasn't being controlled.

thumb thumb

Analysis of the Vibration Characteristics of a Boring Bar ...

Boring bars are widely used in deep hole machining. Due to the low stiffness of the long cantilever boring bar, vibration often occurs in the boring process. Vibration suppression can permit higher productivity and a better surface finish. To improve the performance of boring operations, a variable stiffness dynamic vibration absorber (DVA) is added inside the boring bar to reduce the vibration.

thumb thumb

Dynamic Analysis of the Forced Vibration Drilling Process ...

Jan 01, 2018· 3. Experimental characterization To highlight the dynamic behavior of the VAD, an experimental protocol was designed and built. The dynamic analysis is divided into four separate parts: static load test, frequency impact test, dynamic measurement during rotational speed on the air, and a dynamic analysis during a drilling process. 3.1.

thumb thumb

1713. Dynamic analysis in a micro drilling process with ...

1713. Dynamic analysis in a micro drilling process with ultrasonic vibration Bo-Wun Huang1, Jung-Ge Tseng2, Wu-Tsan Chen3 1, 3Department of Mechanical Engineering, Cheng Shiu University, Kaohsiung, Taiwan 2Department of Leisure and Sport Management, Cheng Shiu University, Kaohsiung, Taiwan 1Corresponding author

thumb thumb

Planetary Gearbox Vibration Signal Characteristics ...

Then, the analysis of planetary gearbox vibration can be divided into two simple parts: the fixed-shaft gearset vibration analysis and the impact of sensor's spinning motion on fixed-shaft gearset vibration signal. Unless otherwise specified, the term "relative" in this paper means the relative motion to …

thumb thumb

Vibration Problem - an overview | ScienceDirect Topics

In order to predict noise and vibration, classic low-frequency approaches are applied to establish system dynamic properties or system dynamic equations in a large number of degrees of freedom by use of finite element dynamic analysis or an experimental modal analysis method, then to calculate the system responses from excitation and the dynamic properties or equations.

thumb thumb

Dynamics and Vibrations - Notes

4.2 Linear impulse-momentum relations. 4.3 Angular impulse-momentum relations. 4.4 Summary of equations and definitions . 5. Vibrations (pdf version) 5.1 Features of vibrations and overview of issues in controlling vibrations. 5.2 Free vibration of conservative single degree of freedom systems. 5.3 Free vibration of damped single degree of ...