acoustic vibration and inertia detectors

... assumed as (0)f 0, (0)f 0 • = = and using the Runge-Kutta method In the free and linear vibration case, Eq (24) becomes: and the fundamental frequencies of natural vibration of the ES-FGM can be ... industries, and other engineering structures Therefore, many investigations have been carried out on the dynamic and vibration response of FGM plates Woo et al [1] investigated the nonlinear free vibration ... [3] studied the free vibration and stability of FGM plates according to a 2D high order deformation theory Allahverdizadeh et al [4] studied the nonlinear free and forced vibration analysis of

Ngày tải lên: 11/12/2017, 21:27

... strains, and stresses of plates Let  be the domain in R2 occupied by the mid-plane of the plate and u0, v0, and w0 and ˇ D ˇx, ˇy/T denote the displacement components in the x, y, and ´ directions and ... (12) where E1 and E2 are the Young modulus in the 1 and 2 directions, respectively; G12, G23, andG13 are the shear modulus in the 1–2, 2–3, and 3–1 planes, respectively; and 12 and 21 arePoisson ... functions and NNA., / and qAD ŒuA vA wA ˇxA ˇyA T are the rational basic functions and the degrees of freedom of uhassociated with control point A,respectively The membrane bending, shear strains, and

Ngày tải lên: 16/12/2017, 11:18

... domain Free vibrations andforced vibrations may have to be analyzed This chapter provides the basics of the time-domainrepresentation and analysis of mechanical vibrations Free and natural vibrations ... anundamped oscillator and a damped oscillator Associated terminology, which is useful in vibration analysis, isdefined 1.1 Introduction Vibrations can be analyzed both in the time domain and in the frequency ... Elements Mass (inertia) and spring are the two basic energy storage elements in mechanical systems The concept of state variables may be introduced as well through these elements 1.2.1.1 Inertia (m)

Ngày tải lên: 05/05/2018, 09:32

... time-domainrepresentation and analysis has an equivalent frequency-domain representation and analysis, at leastfor linear dynamic systems For this reason, and also because of the periodic nature of typical vibrationsignals, ... mobility functions, and transmissibilityfunctions These are described in the present section and in the subsequent section, and their use isillustrated.Through variables (force) and across variables ... input, and the amplification factor and the phase-lead angle inthe corresponding response are determined at steady state The frequency of excitation is variedcontinuously for a sine sweep and in

Ngày tải lên: 05/05/2018, 09:32

... the shaft axis, and k1; k2; and k3as the torsional stiffness in the connecting shafts Furthermore, the motion coordinates y1and y2are rotations and the external excitations f1ðtÞ and f2ðtÞ are ... M and K, in general To understand this further, we may observe thatv2 i ¼ Ki=Miand consequently we are unable to pick both Kiand Miarbitrarily In particular, for the M-normal case Ki¼v2 i and ... excitation of their preferred motionsuch as modal vibrations and resonances By modal analysis, it is possible to establish the extent andlocation of severe vibrations in a system For this reason, it

Ngày tải lên: 05/05/2018, 09:32

... separation of time and space The orthogonality property of mode shapes is established Boundaryconditions are derived Free vibration and forced vibration are analyzed 4.1 Introduction Often in vibration ... x0: ›uðx0; tÞ 4.4.2 Torsional Vibration of Noncircular Shafts Unlike the longitudinal and transverse vibrations of rods and beams, when considering the torsionalvibration of shafts, the equation ... buildings, and space stations; the ride quality and structural integrity analysis of buses,trains, ships, aircraft and spacecraft; the dynamics and control of rockets, missiles, machine tools androbots;

Ngày tải lên: 05/05/2018, 09:33

... Response to Multiple Random Forces † Impulse-Response Approach † Modal Analysis Approach5.6 Continuous System Random Vibration 5-29Transverse Vibration of Beams † Random Transverse Vibration Summary ... z and v n are deterministic and, therefore, so is the governing equation of motion. If z and v n are either random variables or processes then the governing equation is random The case of random ... given by stationary random process FðtÞ and the outputdisplacement by random process XðtÞ: Note that it is customary to use upper case letters XðtÞ to representrandom processes, and lower case letters

Ngày tải lên: 05/05/2018, 09:33

... simplemathematical model requires an in-depth understanding of vibration principles and techniques,extensive experience in vibration modeling, and ingenuity in using vibration software tools.Furthermore, it ... characteristics of the vibration problem Therefore, they constitute an important part of vibrationtheory and vibration engineering When vibration engineers specify design requirements in terms ofvibration, ... Equation 7.34 and letting F ¼ 0; one can obtain When conducting vibration modeling, modelers need to understand how idealization andsimplification will affect the resulting natural frequencies and the

Ngày tải lên: 05/05/2018, 09:33

... diand djand converting the cross-product to the matrix form, we get Jj€aj2 RT pjðKpðxiþ RpiaiÞ 2 Kpðxjþ RpjajÞÞ ¼ Mj ð8:40ÞExpanding this, we get mj€xj2 Kpxi2 KpRpiaiþ Kpxjþ KpRpjaj¼ Fj ð8:45Þand ... six degrees offreedom and all six natural frequencies will be calculated Since stiffness parameters are on the Oxy plane, no coupling will occur between (x and b) and(y anda) Similarly, the vertical ... frequencies,decoupling of modes, and response to shock represent a large proportion of vibration design problems,there are other and more complex design specifications For example, minimizing vibration at a point

Ngày tải lên: 05/05/2018, 09:33

... Concentrated Mass/Inertia Element A concentrated mass/inertia element represents a structural mass and moment of inertia concentrated atone point and has six DoF: three translational and three rotational ... stiffnessand damping characteristics between two points in the structure * A concentrated mass/inertia element represents a structural mass and inertia at a point andhas six DoF: three translational and ... happens if the inertia terms of the mass/inertia element are assigned as zero This can be avoided by always assigning an arbitrary and small value to the rotary inertia terms 9.1.2.2 Spring and Damper

Ngày tải lên: 05/05/2018, 09:33

... Topics of Signal Analysis 10-26 Bandwidth † Transmission Level of a Band-Pass Filter † Effective Noise Bandwidth † Half-Power (or 3 dB) Bandwidth † Fourier Analysis Bandwidth † Resolution in Digital ... interpretation,experimental modeling and modal analysis, diagnostic techniques, signal/image processing and patternrecognition, acoustics and speech research, signal detection, telecommunications, and dynamic testingfor ... sinusoidal) components of periods T and T=2 andamplitudes a1and a2as shown in Figure 10.3 The cyclic frequency (cycles/sec, or hertz, or Hz) of the twocomponents are f1¼ 1=T and f2¼ 2=T: Note that in order

Ngày tải lên: 05/05/2018, 09:33

... However, this chapter has the restricted objective of, on onehand, discussing concepts closely related to vibration analysis, and on the other hand, citing sources thatcan be readily available to a potential ... characterization are examined Section 11.8provides an overview and concluding remarks on the applicability and usefulness of the wavelet analysis invibration theory To enhance the usefulness of this chapter, ... decomposition and reconstruction algorithms ensure computational efficiency, and rivalclassical spectral analysis algorithms such as the fast Fourier transform (FFT) The field of vibrationanalysis

Ngày tải lên: 05/05/2018, 09:33

... 1981; Cox, 1983; Hughes and Belytschko, 1983; Irvine, 1986; 2.01.51.00.50.0 Trang 15Dokainish and Subbaraj, 1989; Colvin and Morris, 1990; Hale and Adhami, 1991; Mercer and Lincoln,1991; Seipel, ... ð12:14Þwhere my and sy are, respectively, the mean and the standard deviation of the yj values: The number of standard deviations, a; is given in Table 12.4 for different values of ri; P0; andp0:SRSEnv ... related tohandling and possible free fall drop and impact onto a floor A method to characterize the shock fragility of thepackaged product, using the “damage boundary curve” (DBC), and to choose

Ngày tải lên: 05/05/2018, 09:33

... Fluid–Structure Interaction 13-33 Added Mass and Inertial Coupling † Wave-Induced Vibration of Structure 13.5 Blast Loading and Blast Effects on Structures 13-34 Explosions and Blast Phenomenon † Explosive ... underlying earthquake engineering andseismic design In this section, seismic codes and standards are reviewed including American, British, and Europeanpractices Active and passive control systems for ... earthquakes, wind, floorvibrations, blast effects, and impact- and wave-induced vibration The effects of these loadings ondifferent engineering structures are also discussed It is standard practice to

Ngày tải lên: 05/05/2018, 09:33

... 1964;Robinson and Demorieux, 1968; Vecchio and Collins, 1981; Schlaich et al 1982; Schlaich and Schafer,1983; Vecchio and Collins, 1986; Eibl and Neuroth, 1988; Miyahara et al 1988; Kollegger and Mehlhorn,1990; ... element andslc;stc; andtltfor concrete struts Both sets of stresses ðsl;st;tltandslc; stc;tltcÞ satisfy the transformation equations In summing the concrete stresses and the steel stresses inthe l and ... (Vecchio and Collins, 1981); the rotating-angle softened trussmodel (RA-STM) (Belarbi and Hsu, 1994, 1995; Pang and Hsu 1995); the fixed-angle softened trussmodel (FA-STM) (Pang and Hsu, 1996; Hsu and

Ngày tải lên: 05/05/2018, 09:33

... shapes, and even a complete dynamic model 6 Vibration monitoring for performance evaluation 7 Control and suppression of vibration Figure 15.1 indicates a procedure typical of experimental vibration, ... follows from Equation15.2 and Equation 15.3 thatVibration Testing Applications for Products: * Design and Development * Production Screening and Quality Assessment * Utilization and Qualification for ... during the test; theircapabilities include variable-force and constant-force testing and wide-band random-input testing Thevelocity and acceleration capabilities of hydraulic shakers are moderate

Ngày tải lên: 05/05/2018, 09:33

... 23.21 Hand-held velocity pickup used for locating points of minimum and maximum motion Fig 23.22 A specialized vibration meter If you knew the velocity and the frequency of sinusoidal vibration, ... 4.98 0.498 Note, from Eqs (23.2a) and (23.2b), that fN depends on 6, and thus on both M and K (or W and K) As long as both load and stiffness change proportionately, fN does not change The peak-to-peak ... high stresses, large forces, and large motions result All remarks about free vibration, fN, and damping apply to continuous systems We can "pluck" the beam of Fig 23.6 and cause it to respond in...

Ngày tải lên: 25/10/2013, 13:15

... introductions to nonlinear vibration can be found in Virgin (2000), in Worden and Tomlinson (2001), and in the standards by Nayfeh and Mook (1978) and Nayfeh and Balachandra (1995) REFERENCES Benaroya, ... the standards by Thomson and Dahleh (1993), Rao (2004), and Meirovitch (1986) A complete summary of most vibration- related topics can be found in Braun, Ewins, and Rao (2002) and in Harris and ... introductory review of vibrations and to expand the discipline of vibration analysis and design by intertwining elementary vibration topics with the disciplines of design, control, stability, and testing...

Ngày tải lên: 08/04/2014, 11:49

... reconstructed with TLD detectors and compared with the Markus ionization chamber and a silicon diode response Fig – Spread Out Bragg Peak (SOBP) reconstructed with TLD detectors and compared with ... Physics entitled “Radiation and Particle Detectors was held in Varenna, which involved the use of detectors for the research in fundamental physics, astro-particle physics, and applied physics At ... interactions and forces among the elementary particles, the deep structure of space and time, especially regarding the intersection of quantum mechanics and cosmology, where current theories and knowledge...

Ngày tải lên: 03/05/2014, 19:06

... integrated acoustic echo and noise suppression algorithm using the combined power of acoustic echo and background noise within a soft decision framework The combined power of the acoustic echo and noise ... background noise and the echoes by acoustic coupling between a loudspeaker and a microphone of this equipment [1, 2] Thus, for hands-free mobile equipment, the serial combination of the acoustic echo ... method can suppress the acoustic echo and the noise signal with a single gain based on soft decision For this, the noise and echo spectral are separately and efficiently estimated and combined by a single...

Ngày tải lên: 20/06/2014, 20:20