Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Torsional moment of inertia

AT = average accelerating torque over the speed interval (difference between motor and load torque) g = gravitational constant WR -- torsional moment of inertia... [Pg.274]

A quick review of system torsional response may help explain why a resilient coupling works. Figure 9-14 is a torsional single degree of freedom system with a disk having a torsional moment of inertia J connected to a massless torsional spring K. [Pg.391]

As = shear area T = torsional moment of inertia P = density ij, r local axes are parallel to Z and Y axes... [Pg.742]

The rate coefficient is evaluated using eqs. 38 and 43 above where the torsional moment of inertia is given by ... [Pg.95]

A torsional spring of stiffness K, a mass of moment of inertia / and a fluid damper with damping coefficient C are connected together as shown in Figure 3.25. The angular displacement of the free end of the spring is 0 ( ) and the angular displacement of the mass and damper is 6a t). [Pg.61]

The calculation for torque is a primary example of a single degree of freedom in a mechanical system. Figure 43.15 represents a disk with a moment of inertia, /, that is attached to a shaft of torsional stiffness, k. [Pg.682]

Geometric Examination. The polymer chemist needs to examine the various characteristics of the molecule in the molecular workspace. Bond lengths, bond angles and torsional angles can be measured for the current structure and compared to accepted values. In addition, other geometric properties can be computed like overall dimension, moments of inertia, molecular volume and surface area. [Pg.32]

As in the case of the MM2 force field, parameterization of MM3 for amines was based mainly on experimental data with occasional references to ab initio calculations, mainly to evaluate relative conformational energies and derive appropriate torsional parameters. As mentioned above, one notable difference between the two force fields is the removal of lp on sp3 nitrogens from MM3. This simplifies the treatment of vibrational spectra and allows for a realistic treatment of nitrogen inversion which could not be handled by MM2. As usual with MM3, parameterization was aimed at reproducing a variety of molecular properties such as structure, steric energy, dipole moments, moments of inertia, heat of formation and vibrational spectra. A complete list of MM3 parameters for amines is provided in Reference 6. [Pg.23]

Here cp represents the torsional coordinate, I denotes the moment of inertia, and Vf is the first coefficient of the Fourier series expansion of the isomerization potential of periodicity nn. [Pg.251]

The torsional potentials are characterized by the reciprocal moment of inertia and the potential parameters Ek and Vf. All quantities are given in electron-volts. [Pg.257]

Note 3 A damping curve is usually obtained using a torsion pendulum, involving the measurement of decrease in the axial, torsional displacement of a specimen of uniform cross-section of known shape, with the torsional displacement initiated using a torsion bar of known moment of inertia. [Pg.171]

Steric parameters include bond length, bond angle, bond torsion, conformation, topology or connection among atoms in the molecule, symmetry, moment of inertia, molecular diameter, molecular surface area, molecular volume, and molecular shape. [Pg.157]

The partition function of a molecule also contains torsional motions and the construction of such a function requires the knowledge of molecular mass, moments of inertia, and constants describing normal vibration modes. Several of these data may be acquired from infrared and Raman spectra (67SA(A)891 85JST( 126)25), but the procedure has not yet been extensively applied owing to experimental limitations. To characterize the barrier one also needs to know more than one constant, and these are often not available from... [Pg.78]

Few details of the apparatus are given in ISO 4663, it is simply stated that means shall be provided to measure frequency to 1% ( 5% in a transition region), amplitude to 1% and, for method C, the supplied energy to 2%. It is suggested that a moment of inertia of about 0.03 gm is suitable for the inertia member which may be a disc or rod. For methods B and C the torsion wire should be of such dimensions that its restoring torque is not more than 25% of the total restoring torque due to the test piece and suspension. BS 903 (equivalent to method B of ISO 4663) suggests that moments of inertia between 50 and 500 g cm are suitable and states that the tensile strain on the test piece should be between 0 and 5%. The British... [Pg.189]

For lateral force measurements, the constant of the cantilever torsion can be calculated from k=GJ/l, where G is the shear modulus and J is the polar moment of inertia ... [Pg.71]

Barriers to internal rotation of 4.4 kcal mol (corresponding to torsional vibratons of about 55 cm ) were selected in order to give the observed entropy at room temperature. The principal moments of inertia for the nonplanar model were taken as I. = 30.60... [Pg.1561]

A calibration wire whose shear modulus is known can be used to determine the moment of inertia of the pendulum assembly, so that quantitative measurements of the dynamic mechanical properties of specimens can be made. The shear modulus of the calibration wire is obtained by measuring the period of oscillation of a simple torsion pendulum consisting of an aluminum rod suspended by the wire. The moment of inertia of this system is given by... [Pg.348]

However, the torsional vibration will be very strongly affected by this increased mass. Torsional vibrations involve motions around the centre of mass and the mass of the nitrogen atom plays no role in this displacement. The moment of inertia of ND4 is twice that of NH4 and the ratio of their torsional frequencies is, therefore, 2, Eq. (5.1). Thus the perhydro ammonium ion should have its torsion at about 550 cm. The... [Pg.187]


See other pages where Torsional moment of inertia is mentioned: [Pg.164]    [Pg.740]    [Pg.44]    [Pg.89]    [Pg.164]    [Pg.740]    [Pg.44]    [Pg.89]    [Pg.119]    [Pg.292]    [Pg.33]    [Pg.407]    [Pg.377]    [Pg.378]    [Pg.40]    [Pg.56]    [Pg.206]    [Pg.157]    [Pg.403]    [Pg.172]    [Pg.405]    [Pg.371]    [Pg.138]    [Pg.114]    [Pg.40]    [Pg.41]    [Pg.249]    [Pg.832]    [Pg.231]    [Pg.656]    [Pg.348]    [Pg.36]    [Pg.371]    [Pg.377]    [Pg.739]   
See also in sourсe #XX -- [ Pg.44 ]




SEARCH



Inertia

Inertia moment

Moment of inertia

Torsional moment

© 2024 chempedia.info