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Vibration Analysis and Control - New Trends and Developments

Vibration Analysis and Control - New Trends and Developments

Kỹ thuật lập trình

... fixed setting x the frequency response function (FRF) H Av relating y A to v , and the FRF TBA relating y B to y A (i.e the transmissibility) were measured Fig 20a shows H Av for different settings ... against the exact theory governing the actual (continuous) ATVA structures of Fig 16 for σ = and two given settings x = 0.25 , 0.5 For each setting of x the corresponding values of ωa and R were ... associated to exogenous harmonic vibrations affecting a mechanical vibrating system (Beltran et al., 2004) To that, consider the input-output differential equation (16), where only displacement measurements...
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NEW TRENDS AND DEVELOPMENTS IN BIOMETRICS pot

NEW TRENDS AND DEVELOPMENTS IN BIOMETRICS pot

Kĩ thuật Viễn thông

... Mel scale functions should be equal at the Nyquist frequency and Equation 24 is the result of minimizing the absolute values of the partial derivatives of E in Equation 23 with respect to c and ... [18] The resulting c and k which would satisfy Equations 24 and 25 are computed by Fan, et al [18] to be c = 6375 and k = 50000 Therefore, the exponential scale function is given by Equation 26 ... estimating the reliable regions of the spectrogram of speech and then using these reliable portions to perform speech recognition They this by estimating the noise spectrum and the SNR and by creating...
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Vibration Analysis and Control New Trends and Developments Part 15 pptx

Vibration Analysis and Control New Trends and Developments Part 15 pptx

Kĩ thuật Viễn thông

... salivation for or continuous days with the same time schedule (Fig 1D) We also investigated the adaptation periods during continuous use of vibrotactile stimulation for or continuous days in the ... 3A, 3B, 3C and 3D) showed non-adaptation to continuous stimulation, because they showed parallel or over-increasing curves, indicating that continuous usage of this apparatus should not be a ... believe that their interpretation does not adequately explain this situation We suggest that vibrating stimuli may promote parasympathetic effects by inhibiting the sympathetic effects elicited by...
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Vibration Analysis and Control New Trends and Developments Part 1 pot

Vibration Analysis and Control New Trends and Developments Part 1 pot

Kĩ thuật Viễn thông

... natural frequency with its base (point of attachment) blocked The TVA can be used in two distinct ways, resulting in different optimal tuning criteria and design requirements (von Flotow et al., 1994): ... technical challenge is to design an adaptive device with such attributes This chapter continues with a quantitative illustration of the basic design principles of both variants of the TVA It will ... (mistuning) can occur due to a change in the excitation frequency (e.g a change in operating speed of rotating machinery) It is evident from Fig that even a slight mistuning will drastically degrade...
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Vibration Analysis and Control New Trends and Developments Part 2 potx

Vibration Analysis and Control New Trends and Developments Part 2 potx

Kĩ thuật Viễn thông

... fixed setting x the frequency response function (FRF) H Av relating y A to v , and the FRF TBA relating y B to y A (i.e the transmissibility) were measured Fig 20a shows H Av for different settings ... against the exact theory governing the actual (continuous) ATVA structures of Fig 16 for σ = and two given settings x = 0.25 , 0.5 For each setting of x the corresponding values of ωa and R were ... 13, 18), the variations of ωa and R with ATVA setting x for various fixed values of σ are investigated for both types of ATVA in Fig 16 The resulting characteristics are depicted in Fig 18 With...
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Vibration Analysis and Control New Trends and Developments Part 3 potx

Vibration Analysis and Control New Trends and Developments Part 3 potx

Kĩ thuật Viễn thông

... Developments where Hθ (ω ) and H h (ω ) are transfer functions in the frequency domain Substituting equation (6) into equation (5) leads to ⎡ −(1 + λ )ω + 2ζ sωθ iω + ωθ ⎢ −αλω / R ⎢ ⎣ −αλω / R 2 −λω / R ... uncoupled lateral mode From the equation (18) and (19), the constant a is determined by Ky 0.02 × 2ms a= ms (20) Ky Combining the Equation (2) and (15), the equation of motion for torsionally ... algebraic identifier for the amplitude F0 of the harmonic vibrations acting on the mechanical system, the input-output differential equation (23) is expressed in notation of operational calculus as...
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Vibration Analysis and Control New Trends and Developments Part 4 pdf

Vibration Analysis and Control New Trends and Developments Part 4 pdf

Kĩ thuật Viễn thông

... obtain this angle, the argument equation of the closed-loop characteristic equation is used That is, any point s1 of a specific trajectory verifies the following equation nz ∑ ∠(s i =1 np ( ) + ... different earthquake records The displacement time history curves of the top story are shown from Fig to Fig and acceleration time history curves in Fig 17 to Fig 19 for El Centro earthquake It can ... Qian’an earthquake records are selected to input to the structure as excitations, which represent different site conditions The structural response without liquid dampers subjected to earthquake in...
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Vibration Analysis and Control New Trends and Developments Part 5 pot

Vibration Analysis and Control New Trends and Developments Part 5 pot

Kĩ thuật Viễn thông

... equal to , is the vertical stiffness of the tire, and , and are the vertical displacements of sprung mass, unsprung mass and road excitation respectively The state space equation of proposed quarter ... robustness is enhanced in case that initial condition of reaching phase is located in quadrant or quadrant Hence, shifting algorithm, which can change the intercept as a function of , is adopted and ... manufactured After evaluating the field-dependent damping characteristics of the MR damper, a quarter vehicle suspension system was then constructed and its governing equations of motion were...
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Vibration Analysis and Control New Trends and Developments Part 6 potx

Vibration Analysis and Control New Trends and Developments Part 6 potx

Kĩ thuật Viễn thông

... network is developed Training and validating of the network models are achieved by using data generated from the numerical simulation of the nonlinear differential equations proposed for MR damper The ... damping torque, the gravitational forces torque and the spring torque acting on the lower rocking lever, respectively and their equations are: M 21 = − k2ω2 M 22 = −G2 R2 cos (α ) (2) Ms = r2 sFs ... al., 2008); (Isermann & Munchhof, 2011); (Martins et al., 2006); (Tahboub, 2005); (Chen & Huang, 2005) and references therein In addition, some interesting semiactive vibration control schemes,...
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Vibration Analysis and Control New Trends and Developments Part 7 docx

Vibration Analysis and Control New Trends and Developments Part 7 docx

Kĩ thuật Viễn thông

... automatic control tasks based on high speed FPGA/DSP boards with high computational performance operating at high sampling rates The proposed observer could be implemented via embedded software applications ... without many problems Simulation results Some numerical simulations were performed on a nonlinear quarter-vehicle suspension system characterized by the following set of realistic parameters (Tahboub, ... flatness based controller and a robust observer Therefore, a perturbed input-output differential equation describing the dynamics of the flat output is obtained for design purposes of the control...
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Vibration Analysis and Control New Trends and Developments Part 8 potx

Vibration Analysis and Control New Trends and Developments Part 8 potx

Kĩ thuật Viễn thông

... and the weighting matrix used in the semi-active control are simultaneously optimized so that the control performance on vibration suppression for various recorded and artificial earthquake disturbances ... Iyer CSIR/Structural Engineering Research Centre India Introduction Earthquakes are highly destructive natural phenomena resulting in the massive deterioration of civil infrastructure, which becomes ... cycles establishes the behavior which is suitable for seismic applications It is interesting to find that from the quasi-static behavior of the material an optimum value of pre strain, which is material...
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Vibration Analysis and Control New Trends and Developments Part 9 ppt

Vibration Analysis and Control New Trends and Developments Part 9 ppt

Kĩ thuật Viễn thông

... differential can be eliminated Hence equation (2) and (3) can be used for predicting the behaviour after many cycles by appropriately changing the values of ‘n’ and the starting stress value which follows ... Substituting Eq (20) in eqs (23) and (24) and eliminating FC , it follows that + X U = ( HUC + HUD PDC )( H KC + H KD PDC ) X K (25) Therefore, one has now, instead of Eq (4), another one relating ... model can represent the behavior of the energy dissipating system (Fig.19a) If re centering device is utilized the hysterisis should be adequately represented using mathematical models 194 Vibration...
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Vibration Analysis and Control New Trends and Developments Part 10 pot

Vibration Analysis and Control New Trends and Developments Part 10 pot

Kĩ thuật Viễn thông

... depend on the operating condition, described by a specific wind and rotor speed A controller designed for a turbine at one operating point may give poor results at other operating conditions In ... interesting first to have a look at the response without any control at all Then, after implementing the controller, is it easier to see how good the controller works in the disturbance accommodating ... task Now, by setting both the LQR and the wind disturbance gain equal to zero, perturbations in rotor speed (i.e deviation from the operation point) shown in Figure when simulating for 50 seconds...
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Vibration Analysis and Control New Trends and Developments Part 11 pdf

Vibration Analysis and Control New Trends and Developments Part 11 pdf

Kĩ thuật Viễn thông

... of Vibrations for High Precision Laser Cutting Machine 245 isolation by simulating numerically the disturbances coming from the ground and by evaluating their transmission through all the system ... Applications, pp 117–122 Gu D.-W., Petkov P.Hr & Konstantinov, M (2005) Robust Control Design With MATLAB, Springer Ekelund, T (1997) Modeling and Linear Quadratic Optimal Control of Wind Turbines, PhD ... coil, l is the coil length The direction of the resulting force is illustrated in Figure The amount of required force for each actuator is equal to 200 N while the main parameters of the designed...
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Vibration Analysis and Control New Trends and Developments Part 12 potx

Vibration Analysis and Control New Trends and Developments Part 12 potx

Kĩ thuật Viễn thông

... = G : equipment balance quality grade, see Table 1: (ISO 1940-1, 2003) For rotors of electric motors, R.Ω was considered equal to 0.0025 m/s Substituting this value in Equation (6), it is obtained: ... force caused by unbalanced mass, acting on the axis, according to directions in the shown coordinate system, can be written as presented in Equations (1) and (2) In Equations (1) and (2), the dynamic ... of the vibrating mass on the responses of the framed structures Loads generated by mechanical equipment (rotating machinery) Knowledge about the dynamic behaviour of rotors of rotating machinery,...
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Vibration Analysis and Control New Trends and Developments Part 13 pot

Vibration Analysis and Control New Trends and Developments Part 13 pot

Kĩ thuật Viễn thông

... Iberian Latin American on Computational Methods in Engineering and MECOM 2010: IX Argentinean Congress on Computational Mechanics, CILAMCE 2010, Buenos Aires, Argentina AMCA (Argentine Association ... range with length equal to 1m (one meter) For each range of 1m it was placed a translational spring in the transversal direction of the pile section axis with a stiffness value equal to the value ... obtained using Equation (13) It is defined M as the mass matrix and K as the stiffness matrix of the system (Craig Jr., 1981; Clough & Penzien, 1995; Chopra, 2007) C = αM + β K (13) Equation (13)...
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Vibration Analysis and Control New Trends and Developments Part 14 potx

Vibration Analysis and Control New Trends and Developments Part 14 potx

Kĩ thuật Viễn thông

... was determined as the difference between resting and stimulating salivation We defined a 5-min interval as the recovery time between resting and stimulating salivation from a preliminary study First, ... challenge with continuous use of stimulation is an adaptive effect In particular, we were interested in determining whether the effect was continuous without attenuation, when patients continue using ... known as (84.54 N)2 for each channel, the weighting for the output noise V is utilized as a design parameter For the optimal regulator the weighting matrices for the states and the input variables...
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New Trends and Developments in Automotive Industry Part 1 ppt

New Trends and Developments in Automotive Industry Part 1 ppt

Kĩ thuật Viễn thông

... 2008) Two main processes are continuously active in the WSIG web application: i The process responsible for intercepting DF registrations/de-registrations and converting them into suitable WSDLs ... by adjusting the rearward flaps of the belt Figure 10 shows the setup and some flow characteristics of the moving belt ground plane at the LLF 4.3 Rotating wheels The effects of rotating wheels ... Engineering (CE) (Khalid et al., 2006) It is developed for the purpose of supporting affective design as an alternative to existing methods such as Kansei Engineering (Nagamashi, 1989) Citarasa refers...
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New Trends and Developments in Automotive Industry Part 2 docx

New Trends and Developments in Automotive Industry Part 2 docx

Kĩ thuật Viễn thông

... calculating transformation matrices for both cameras, derived from the exact set up of the camera positions, the transformation equations for each marker image can be constructed, resulting in an equation ... cylindrical lens It is also possible to reflect the laser beam on a rotating mirror The continuously rotating Automotive Testing in the German-Dutch Wind Tunnels 31 laser beam gives the same effect ... of about 10 minutes Automotive Testing in the German-Dutch Wind Tunnels 27 The test technique is providing very nice results in as well a quantitative as a qualitative way Only close to the surface...
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New Trends and Developments in Automotive Industry Part 3 pptx

New Trends and Developments in Automotive Industry Part 3 pptx

Kĩ thuật Viễn thông

... according to the purposes of collaboration and are updated continuously by creating and adding elements to improve them and to achieve continuous positive outcomes Besides, the human capital involved ... Sustainable Service Program (SSP) in the small auto body shops that holds the exciting potential of preventing, eliminating and/or reducing the environmental and occupational risks associated to this ... five stages: management support, planning, implementing, checking, and acting Stage 1: Management Support A typical recommendation when setting a program is to get management support because...
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