. Os resultados mostram que a suspensão do tipo trapezoidal teve melhor desempenho em baixas frequências de excitação (ω < 0,2 Hz), enquanto a suspensão do tipo pêndulo simples teve melhor desempenho nas demais condições das pistas normalizadas.PALAVRAS-CHAVE: suspensão passiva de barra, suspensão trapezoidal, suspensão pendular simples.
COMPARISON BETWEEN TWO TYPES OF PASSIVE BOOM SUSPENSION UNDER SIMULATED CONDITIONS OF TRACK TESTABSTRACT: In this paper we conducted several analysis of the simulated dynamic behavior of two passive suspension types of the trailed sprayer booms. The suspension analysis was conducted under conditions of a bump track test ISO 5008, with two levels of speed (5 km h -1 and 15 km h -1 ) and two track profiles proposed in these standards (bumpy and smooth). It was used the simulations software MATLAB ® , SIMULINK ® and Visual Nastran ® . The results obtained showed that suspensions of trapezoidal type have good performance at low frequencies input (ω < 0,2 Hz) while suspensions of simple pendulum type have good performance in others conditions.
A new form to carry out stochastic identification of structures in operational conditions using a non recursive method, the statistic analysis and the wavelet transform, is presented. The statistic analysis contributed to select the best system order and to automation of computational procedures. In general the identification of low frequencies is a difficult task. The wavelet transform is an essential tool for compression of data making possible the complete identification including low frequencies. In addition it improves the computational efficiency. The study of four degrees of freedom simulated system is presented and the results are compared with the analytical modal parameters.
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