Abstract:Anequivalentthin-walledcircularpipemodelisusedtoanalyzetorsionalnaturalfrequencyof U-shapedbellows.TheequivalentradiusandthetorsionalstiffnessofU-shapedbellowsaredefined.Two methodsareusedtocalculatetheequivalentradius.TorsionalstiffnessofU-shapedbellowsiscalculatedusing Chien’sintegrationformulafortorsionalstiffnes...
Based on relationship between the natural frequency and shear stiffness of specimen, a new formula for calculation shear wave velocity, VS, of the specimen are derived. The solutions of the model are simple in use and comparable to those of other models. In addition, an exact expression of ...
aThis data is normally available from the pump manufacturer and is typically used to calculate a frequency range for the corresponding wet and dry torsional natural frequencies. 这数据通常是可得到从泵浦制造商和典型地使用计算一个频率范围为对应的干湿的扭转力固有频率。 [translate] ...
and at a small angle to this direction. The forward-scattered radiation is found to consist of the incident frequency ν0and Stokes and anti-Stokes frequencies of the general formula ν0± nν1, where ν1is usually associated with just one Raman-active vibration of the scattering molecules an...
Vibration magnifier for any excitation frequency can be defined as a quotient of torsional vibration amplitude to static torsion under the same torque value. Static torsional stress value is easy to calculate on the basis of well-known strength of materials' formula. Dependence between vibration ...
13, which shows that (I) the value of the first natural frequency \(f_{N} (N = 1)\) (\(k\) is the order of the natural frequency) increases when \(x_{m}\) changes from \(x_{m} = 0\) to \(x_{m} = {l \mathord{\left/ {\vphantom {l 2}} \right. \kern-\null...
Secondly, the equivalent circuit of the transducer-cylindrical specimen system is derived and the shear modulus can be explicitly obtained using the torsional resonance frequency. The internal friction can also be obtained, which is calculated by using an approximate formula. Then, shear modulus and ...
Then, the results are seen as reference values to construct an objective function, as shown in the following formula: (7) where fi is the frequency of the RM, is the frequency of the BEM, θj is the torsion angle of the girder of the RM, and is the torsion angle of the girder ...
To achieve this, we employed the formula for the critical buckling torque in Eq. (7), which is derived under the assumption of a first-order approximation for \(R/L\), where the thin-walled cylinder is assumed to be sufficiently long (i.e., \(R/L\)< < 1). However, when ...
On the basis of the analysis of the twisting vibration of rotary sucher-rod string, a formula of calculating every harmonic vibration eigenfrequency is presented. 在对旋转抽油杆柱的扭转振动分析的基础上 ,给出了各阶扭转振动固有特性参数的计算式 。 3. The paper introduces the main noise resource...