Utilizing the dynamics simulative software ADAMS to carry out computations on the dynamic response,driving moment and natural frequency of the robot,in view of the above the optimization was carried out on the structural parameters of the robot.
Finally,the natural frequency of the torque sensor was obtained using the impact response method. Test results show that its natural frequency is greater than 12 kHz,which meets the design requirements.
First, the stir and supple degree matrix equation of the whole structure is established through the boundary element method, then the inherent frequency and vibration property is deduced and the dynamic performance of the whole set is analysized and three schemes are compared using dynamic characteristic software that is opened up in our laboratory.
The prototype of the 6-DOF force/torque sensor on the Steward platform is modeled by PRO/E. And the static performance and dynamic performance of the sensor have been studied by using the FEM software-ANSYS. The inherent frequency is also acquired.
With the theoretical analysis, it advances the relationship between the applied voltage and displace of square PZT composite thin plates, the relationship between thickness and displace of composite thin plates, also the relationship between thickness and inherent frequency of composite thin plates, Which providing reference for further comparing and analysing the theory and experiment of MEMS devices with square silicon cup.
Seven anti-shock models with different structure for the acoustic sensor have been designed, and six of them are traditinal models, whose natural frequencies are 10 ～1 Hz, which is in the range of vibration signal scope limitation10 ～1 Hz , and can easily lead to resonance vibration.
Based on the calculation of sensitivity and basic resonant frequency of two kinds of bulk micromachining accelerometers, the structure parameters of cantilever and doublesidesupported accelerometer have been optimized by using the sensitivityfrequency product as the figure of merit of the structures.
And the high sensitivity is attained by adjusting the AC modulation frequency to the intrinsic resonant frequency of the system which consists of the magnetostrictive material and the fiber arms, and by employing a combination formed by magnetostrictive materials in different lengths to broaden the bandwidth of the resonant curve.
This study investigated the dynamic modulus of elasticity (DMOE) of wood panels of Fraxinus mandshurica, Pinus koraiensis, and Juglans mandshurica using the natural frequency measurement system of fast Fourier transform (FFT).
The natural frequency reached 1.201-kHz using finite element analysis, and the practice measurement result was 1-kHz.
Using the differentials of a stiffness matrix to design parameters, a method for calculating the sensitivity of natural frequency is presented.
Through the mode analysis of the liquid-solid coupled system, the first-order natural frequency, diaphragm vibration shape and amplitude-frequency relationship are obtained.
The natural frequency of the system was less than that of the structure on rigid foundation if the SSI is not taken into account, while its damping ratio was larger than that of the structure.
Code combining is used to exploit the multiple signal copies resulting from the inherent frequency diversity of spread spectrum.
Even though the gain due to selection in frequency selective channels is reduced compared to that in flat fading channels due to the inherent frequency diversity, the performance improvement is significant when the system is interference limited.
Each device operates at some inherent frequency, with wide variation among devices.
The windowing helps by reducing the inherent frequency broadening of each interferer caused by the finite duration of the FFT.
The forward problem is to solve the natural frequencies through a cracked structural model and the inverse problem is to quantitatively determine the crack parameters using the experimental testing frequencies.
Contour plots of normalized crack location versus normalized crack size were plotted by using the first three natural frequencies as the inputs.
The estimations of natural frequencies and damping coefficients of the platform found as a result of data processing of microacceleration measurements made during its free oscillations are obtained.
Determining the natural frequencies of fluid oscillations in complex pipelines
Below we formulate the problem of the natural frequencies of small oscillations of a liquid for the general case of an equilibrium liquid surface in a weak potential mass force field.
The simulated results show that FSS may operate in different bands and especially generate a large reduction in the resonant frequency for a fixed unit cell size through different loadings.
Because of coupling of the mechanical and magnetic effects, coupled magnetoacoustic oscillations of a wave nature develop in a certain (resonant) frequency region.
It is found that such a system possesses a rather interesting nontrivial property: under certain conditions it has a resonant frequency at which the rotation of the particles relative to the fluid is most intense.
The dependence of the resonant frequency on the tube length is investigated.
The technique involves measuring the resonant frequency and Q factor of a microwave cavity containing a poly-Si specimen, on which basis the relative permittivity εr and the dissipation factor tanδ are calculated.