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Tuesday, July 14, 2020 | History

3 edition of Component response to random vibratory motion of the carrier vehicle found in the catalog.

Component response to random vibratory motion of the carrier vehicle

Component response to random vibratory motion of the carrier vehicle

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  • 34 Currently reading

Published by National Aeronautics and Space Administration, George C. Marshall Space Flight Center, For sale by the National Technical Information Service in [Marshall Space Flight Center, Ala.], [Springfield, Va .
Written in English

    Subjects:
  • Structural design.

  • Edition Notes

    StatementBy L. P. Tuell.
    SeriesNASA TM -- 100309., NASA technical memorandum -- 100309.
    ContributionsGeorge C. Marshall Space Flight Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15295072M

    FIG. 3 is a perspective view of the vehicle sound and vibration simulator of FIG. 1 with an exemplary infant carrier received therein. FIG. 4 is a block diagram illustrating the functional relationship of the components of an exemplary embodiment of an acoustic system constructed for use with the vehicle sound and vibration simulator of FIG. 1. Con tents Preface xi CHAPTER1 INTRODUCTION Primary Objective 1 Elements of a Vibratory System 2 Examples of Vibratory Motions 5 Simple Harmonic Motion Vectorial Representation of Harmonic Motions 11 Units 16 Summary 19 Problems 20 CHAPTER 2 SYSTEMS WITH ONE DEGREE OF FREEDOM-THEORY Introduction 23 Degrees of Freedom 25 Equation of Motion .

    Special equipment drivers often suffered from vibration which threatened their physical and mental health. In order to study the riding comfort of a special equipment cab, a hammering experiment has been carried out on it by acceleration sensors. According to the test results, the natural frequency has been calculated which was compared with the result analysis by the finite element method. This course also provides insight into: the structure and function of each component; vehicle integration; and related noise, vibration and harshness issues. You will be equipped to evaluate the space requirements, mounting needs, clearances required, and effect on vehicle response for each component.

    Vibration Challenges in the Design of NASA’s Ares Launch Vehicles Abstract This paper focuses on the vibration challenges inherent in the design of NASA’s Ares launch vehicles. A brief overview of the launch system architecture is provided to establish the context for the discussion. Methods to harvest energy that is wasted during road vehicle operation have been studied in recent years. Mechanical vibrations from vertical motion induced by road bumps dissipate a large amount of energy. A linear electric generation system is presented to harvest this energy. The system uses mechanical resonance to maximize the efficiency of harvesting.


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Component response to random vibratory motion of the carrier vehicle Download PDF EPUB FB2

Vibration can be due to the inherent motion of the vehicle, such as manoeuvring, due to in-vehicle sources such as motors, or due to the surface on which the vehicle is travelling. In most cases, the focus of vehicle ergonomics is on the driver, but in many cases, vehicles will contain multiple people, all of whom are exposed to by: 1.

vehicles for calculation of ground vibration was presented and four degree of freedom half car model established. Response spectrum of ground vibration was found and experimental work has done (Hunt ).

Random road surface roughness is described by its power spectrum, and the dynamic response of vehicles to the road roughness isFile Size: KB. Vibration response investigation and vibration testing. In order to check the test object’s function and examine the influence of resonances throughout the frequency range, a vibration response will have to be investigated.

For all types of tests the resonances are found by sine sweep or random broadband noise (white noise).Cited by: 2. The vibration response spectrum is particularly suited for random vibration inputs. Pure sinusoidal vibration, on the other hand, can be dealt with using time domain methods.

The vibration response spectrum has many uses. The purpose of this tutorial is to present this function and give an example of a typical application.

EQUATION OF MOTION. The improvement of a vehicle body structure under the constraint of noise, vibration and harshness (NVH) behavior is investigated by using design of experiments (DOE) method. While designing this component, it should be ensured that it with stand the random vibration loads for the life cycle of the vehicle.

The chassis was modelled in solid works and analyzed in. Calculate loads on a component by component basis. This was the method ultimately used for the random loads calculation in the Fastrac program.

Because this approach is well-known, it was not evaluated in this test program. The goal of random vibration analysis is to determine how the statistical characteristics of the motion of a randomly.

One purpose for performing a random vibration analysis is to create a component test level specification. With a finite element model, a random vibration analysis can be performed to predict acceleration responses from 20 Hz to Hz.

This response is in turn used as a template to derive a test level specification. Random response analysis –Existing Bracket Random Vibration Response analysis was performed using acceleration spectrum density curve.

Response was obtained up to Hz (First mode of Bracket was Hz). Equivalent RMS Stress was used for the fatigue life calculation. Structural damping ratio of 2% has been considered for the analysis. Vibration is the movement or mechanical oscillation about an equilibrium position of a machine or component.

It can 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 expressed in metric units (m/s 2) or units of gravitational constant “g,” where 1 g = m/s 2.

The design concepts used to implement a computer simulation of a land use decision model are described. Sources delineated by a literature search are examined for the statements made ("source postulates") concerning the interactions of leaders of dominant and subdominant social groups when making land use decisions.

However, in practice an automobile is a nonlinear system because it consists of suspensions, tires and other components that have nonlinear properties. Therefore, the chaotic response may appear when the vehicle moves over a bumpy road. Since the chaotic responses is a random like motion, it could be harmful to the vehicle.

The paper tackles the theme of evaluating dynamic load increases that the vehicle transfers to the road pavement, due to the generation of vibration produced by surface irregularities. The study starts from the generation, according to the ISO Standard, of different road roughness profiles characterized by different damage levels.

In particular, the first four classes provided by ISO   Likewise, random vibration can be passed through a spectrum analyzer to reveal a continuous spectrum of frequencies. On the other hand, sinusoidal vibration is analogous to a laser beam, where the light wave is composed of a single frequency.

Statistics of a Random Vibration Sample A sample random vibration time history is shown in Figure 2. PASSENGER RESPONSE TO RANDOM VIBRATION IN TRANSPORTATION VEHICLES - LITERATURE REVIEW - A.

Healey June, RESEARCH REPORT Document is available to the public through the National Technical Information Service, Springfield, Virginia Prepared for COUNCIL FOR ADVANCED TRANSPORTATION STUDIES. vibration. Today, random vibration is thought of as the random motion of a structure excited by a random input.

The mathematical theory of random vibration is essential to the realistic modeling of structural dynamic systems. This article summarizes the work of some key contributors to the theory of random vibration from. Worn or damaged mounts can also allow the engine, transmission, or exhaust components to come in contact with the frame or body of the vehicle causing a vibration and noise.

Random vibrations are typically vibrations caused by the vehicle driving over bumps, pot holes or rough road surfaces. A type of motion in which a particle moves to and fro about a fixed point. It is quite similar to oscillations. Actually it is the same as oscillations. The only difference is that the term VIBRATION is used when oscillations are having high frequ.

RMS (Root Mean Square) 46 1 V rms 0 Magnitude 0 Hz Hz Pwr Spec 1 1 V-1 Real 0 s ms Time 1 X Hz Y mV dX ms dY mV. This paper reports on the design and fabrication of a responsive carrier component envelope (RCCE) that responds by changing shape through kinetic motion.

The design of the RCCE is based on geometry and structure of carrier surfaces populated with a kinetic structural component that responds to external stimuli. Sine-on-random is an excellent tool for simulating a moving vehicle subjected to random vibration due to road variations while the engine speed is increasing or decreasing.

For waveform replication, Data Physics has a digital vibration control system, SignalCalc Replicator, that reproduces recorded time waveforms of unlimited length on a shaker.Effect Of Vehicle Vibration On Human Body – RIT Experience Katu U.S., Desavale R.G.

and Kanai R.A. Department of Mechanical Engg. Rajarambapu Institute of Technology Sakharale Abstract: Vibration has become an important consideration in engineering. Development of industries and vehicles make the subject even more important.When the motion is repeated in equal intervals of time, it is known as periodic motion.

Simple harmonic motion is the simplest form of periodic motion. If x(t) represents the displacement of a mass in a vibratory system, the motion can be expressed by the equation x = A cos ωt = A cos 2π t τ.