Laser-induced dispersed vibration–rotation fluorescence of acetylene: Spectra oforthoandparaforms and partial trapping of vibrational energy

2002 ◽  
Vol 117 (19) ◽  
pp. 8686-8693 ◽  
Author(s):  
Markus Metsälä ◽  
Shengfu Yang ◽  
Olavi Vaittinen ◽  
Lauri Halonen
Keyword(s):  
Vibrational Energy ◽  
Vibration Rotation ◽  
Partial Trapping

A theory of frequency, intensity and band-width changes due to solvents in infra-red spectroscopy

1960 ◽  
Vol 255 (1280) ◽  
pp. 32-39 ◽  
Keyword(s):  
Harmonic Oscillator ◽  
Force Constant ◽  
Diatomic Molecule ◽  
Dimensionless Parameter ◽  
Vibrational Energy ◽  
Energy Levels ◽  
Infra Red ◽  
Vibration Rotation ◽  
Vibrational Energy Levels ◽  
Rotation Spectrum

The Hamiltonian H , leading to the vibrational energy levels of a gaseous diatomic molecule, is normally written in the form (see Buckingham 1958) H = H 0 + H a (1·1) = - hcB c d 2 /dξ 2 + hcω c 2 /4 B c {ξ 2 + A / ω c ξ 3 + B / ω c ξ 4 + ...}, (1·2) where H 0 = - hcB c d 2 /dξ 2 + hcω c 2 /4 B c ξ 2 is the harmonic oscillator Hamiltonian, and hcω c 2 /2 B c r c 2 is the force-constant; ξ = ( r — r e )/ r e is a dimensionless parameter proportional to the displacement from the equilibrium inter-nuclear distance r e ; A / ω e , B/ω e ,..., are anharmonic coefficients. The constants r e , ω e , B e , A , B , ..., can be obtained from the vibration-rotation spectrum of the gas by comparing the observed energies with those obtained by treating the anharmonic Hamiltonian H a as a small perturbation to H 0 (see Herzberg 1950).

Spectre de vibration-rotation de l’acide chlorhydrique gazeux

1965 ◽  
Vol 62 ◽  
pp. 600-603 ◽  
Author(s):  
Armand Lévy ◽  
Inga Rossi ◽  
Colette Joffrin ◽  
Nguyen Van Thanh
Keyword(s):  
Vibration Rotation

Simply supported FPEDs connected by springs for broadband energy harvesting

2020 ◽  
Vol 64 (1-4) ◽  
pp. 201-210
Author(s):  
Yoshikazu Tanaka ◽  
Satoru Odake ◽  
Jun Miyake ◽  
Hidemi Mutsuda ◽  
Atanas A. Popov ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Evaluation Method ◽  
Energy Harvester ◽  
Vibrational Energy ◽  
Functional Materials ◽  
Vibration Energy ◽  
Theoretical Evaluation ◽  
Vibration Energy Harvester ◽  
Polyvinylidene Difluoride ◽  
Simply Supported

Energy harvesting methods that use functional materials have attracted interest because they can take advantage of an abundant but underutilized energy source. Most vibration energy harvester designs operate most effectively around their resonant frequency. However, in practice, the frequency band for ambient vibrational energy is typically broad. The development of technologies for broadband energy harvesting is therefore desirable. The authors previously proposed an energy harvester, called a flexible piezoelectric device (FPED), that consists of a piezoelectric film (polyvinylidene difluoride) and a soft material, such as silicon rubber or polyethylene terephthalate. The authors also proposed a system based on FPEDs for broadband energy harvesting. The system consisted of cantilevered FPEDs, with each FPED connected via a spring. Simply supported FPEDs also have potential for broadband energy harvesting, and here, a theoretical evaluation method is proposed for such a system. Experiments are conducted to validate the derived model.

Simulation and Analysis of Two-Mass Suspension Modification Using MATLAB Programming

2019 ◽  
Vol 3 (1) ◽  
pp. 160-165
Author(s):  
Hendry D. Chahyadi
Keyword(s):  
Vibrational Energy ◽  
State Space Model ◽  
Mass System ◽  
Modeling And Analysis ◽  
The Road ◽  
Final Project ◽  
Quarter Car ◽  
Automotive Suspension ◽  
Mass Spring ◽  
Matlab Programming

The designs of automotive suspension system are aiming to avoid vibration generated by road condition interference to the driver. This final project is about a quarter car modeling with simulation modeling and analysis of Two-Mass modeling. Both existing and new modeling are being compared with additional spring in the sprung mass system. MATLAB program is developed to analyze using a state space model. The program developed here can be used for analyzing models of cars and vehicles with 2DOF. The quarter car modelling is basically a mass spring damping system with the car serving as the mass, the suspension coil as the spring, and the shock absorber as the damper. The existing modeling is well-known model for simulating vehicle suspension performance. The spring performs the role of supporting the static weight of the vehicle while the damper helps in dissipating the vibrational energy and limiting the input from the road that is transmitted to the vehicle. The performance of modified modelling by adding extra spring in the sprung mass system provides more comfort to the driver. Later on this project there will be comparison graphic which the output is resulting on the higher level of damping system efficiency that leads to the riding quality.

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