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vibration
A matrix equation from an inverse problem of vibration theory
      
The symmetric, positive semidefinite, and positive definite real solutions of the matrix equation XA=YAD from an inverse problem of vibration theory are considered.
      
Acetone solution-casting films of poly(methylmethacrylate) were analyzed by differential scanning calorimetry and pyrolysis gas chromatography-mass spectroscopy under natural evaporation and ultrasonic vibration, respectively.
      
The continuous wavelet transform (CWT) is employed to analyze vibration signals obtained from the motor body.
      
The results of our study indicate that when nano-SiO2, using KH-550 silane as a coupling agent, was added to UF resin by discontinuous ultrasonic vibration, its properties improved effectively.
      
The results show a significant correlation between ES, transverse vibration DMOE (EF), and longitudinal vibration DMOE (EL).
      
Relationships between longitudinal and radial Picea genera sound vibration parameters
      
But in real production, radial sawn timber are cut and are also widely used as vibration component.
      
Therefore, it is very important to evaluate the vibration properties of the board in the round, especially for the sound radiation characteristic of radial sawn timber and its relationship to longitudinal sawn timber.
      
Under the high bending vibration mode, resonance frequency and other parameters of longitudinal and radial wood were tested.
      
Analysis result disclosed the relationship between longitudinal and radial wood vibration property.
      
An important conclusion of wood for musical instruments with proper anisotropy, fine toughness, and weak shear of longitudinal and radial vibration was inducted.
      
In air pressure, a kind of vibration-wheel micromachined gyroscope has achieved a noise level of 0.0073 deg s-1·Hz-1/2 over the 100-Hz bandwidth by using this digital readout technology.
      
To check the response of the rotor-bearing system under unbalance motivation, the Gauss method is used to calculate the dynamic response of the constrained vibration.
      
Meanwhile, some structure parameters that may affect the dynamic performance and forced vibration under unbalance motivation of the rotor-bearing system considering mechanical seals are analyzed in the paper.
      
De-noising of diesel vibration signal using wavelet packet and singular value decomposition
      
The vibration signals of diesel include excess noise that must be eliminated before extraction of characteristic parameters.
      
Firstly, the effects of vibration-signal de-noising among Fourier transform, wavelet decomposition and wavelet packet decomposition are compared.
      
Secondly, singular value decomposition is applied to de-noising vibration signals.
      
In this method, vibration signals are decomposed by wavelet packet, and the wavelet packet coefficient is de-noised by singular value decomposition again.
      
 

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