Construction of a Portable Test Rig to Perform Experimental Modal Analysis on Mobile Agricultural Machinery

Kennes, Patrik; Anthonis, Jan; Clijmans, Luc; Ramón, Herman

doi:10.1006/jsvi.1999.2412

Cited by 15 publications

(6 citation statements)

References 14 publications

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“…From experimental practice, it is known that the vibrations in the transverse direction are much smaller than those in the other two directions: longitudinal and vertical [61][62][63], and, thus, the acceleration measurements were performed on three channels as follows:…”

Section: Tests Under Operating Conditionsmentioning

confidence: 99%

Simulation of Sowing Precision in Laboratory Conditions

et al. 2021

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In agrotechnical practice, it was found that between qualitative indices, which express the sowing precision achieved by precision planters determined in the laboratory, and those determined under operating conditions, that there are certain differences, which are sometimes quite significant. The decrease in the value of the quality indices was manifested by the increase of the number of mistakes, either of the number of double planting holes (with at least two seeds), or of the number of missing planting holes. Both cases are unfavorable for the agricultural producer, generating production losses. This paper discusses the influence of the degree of soil grinding on sowing precision in operating conditions, by determining the spectrum of the vibrations induced in the mechanical structure of row units of a precision planter in contact with the soil of three different plots for three working speeds: 4, 6, and 8 km·h−1. Later, the vibrations were simulated under laboratory conditions, on the stand, by means of rubber hemispheres (with diameters between 30 and 100 mm, corresponding to soil fractions resulting from the determination of the degree of soil grinding) mounted on rubber bands, which actuated the seed meters, for testing under an accelerated regime, outside of the optimal agricultural periods (out of season: beginning mid-May until the end of March), in order to obtain the accuracy of the precision planters. It was found that the sowing precision determined in stationary conditions on the stand, and on a plot with an appropriate degree of seedbed preparation, decreased between 2.92% (at 4 km·h−1) and 6.67% (at 8 km·h−1). The main objective of the tests was to reduce labor costs, which was necessary for the staff involved for determining the qualitative indices of work in real field operating conditions, eliminating fuel consumption, while reducing the duration of testing dependent on meteorological factors (season, temperatures, and precipitation, etc.).

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Section: Tests Under Operating Conditionsmentioning

confidence: 99%

Simulation of Sowing Precision in Laboratory Conditions

et al. 2021

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“…Provided that the body-in-white is discretized into an ndegree-of-freedom linear system without constraint, the system dynamics can be formulated by (1) where M, C and K are n×n real constant matrices of mass, damping coefficient and stiffness of the system, respectively; x(t) and f(t) are n×1 vectors of system displacement and forcing function, respectively.…”

Section: A the Basic Theorymentioning

confidence: 99%

“…Structure dynamics analysis, such as modal analysis, computational or experimental [1]- [2], is broadly used in structure vibration active control [3], armored vehicle dynamics analysis [4]- [5], vehicle-structure interaction [6], and so on. However, there is an increasing trend to apply such analysis in automotive NVH (Noise, Vibration and Harshness) reduction in recent years.…”

Section: Introductionmentioning

confidence: 99%

Structure Dynamics Analysis for Use in Noise Reduction of an Automotive Body-In-White

Wang

Luo

Guo

et al. 2009

2009 International Conference on Information Engineering and Computer Science

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Structure dynamics of the car body-in-white fundamentally determines the interior noise level. Thus, modal analysis and response analysis should be carefully conducted in the noise and vibration reduction. In this study, eleven modes of a car body-in-white below the frequency of 200Hz are tested and identified, and the frequency responses at several key points are analyzed. The first-order modal frequency of 34Hz demonstrates that the NVH design of the car body-in-white is basically content. However, the regions around the engine mounting points and the trunk deck have a 15.5Hz local torsional mode; Frequency response function at the engine mounting point 22 has a 23.5Hz resonant frequency; Additionally, because there exist two resonant frequencies at 18Hz and 24Hz, respectively, within the normal excitation frequency range, remarkable vibration might be readily transmitted from the steering fixing point to the driver and induce noise. Therefore, to reduce the interior noise effectively, local stiffness around the engine mounting point 22, the trunk deck and the steering shaft fixing point 33 should be improved, and pertinent structure should be carefully refined.

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“…Many researchers have studied the relating problems. For example, Humar and Soucy [2], Kennes et al [3], Stanbridge and Ewins [4], Yang and Sadler [5], Alampalli [6], Kwon and Lee [7], Wang [8], Ceballos et al [9], Hollkamp and Gordon [10] and Hermans and Auweraer [11] have investigated the dynamic characteristics of jet engine blades, rotating machinery, civil engineering structures, etc., by means of modal testing technique. From the existing literature, it is found that the reliability of the adopted mathematical model must be validated before the dynamic analyses are performed.…”

Section: Introductionmentioning

confidence: 98%

Finite element analysis and vibration testing of a three-dimensional crane structure

Wu¹

2006

Measurement

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Construction of a Portable Test Rig to Perform Experimental Modal Analysis on Mobile Agricultural Machinery

Cited by 15 publications

References 14 publications

Simulation of Sowing Precision in Laboratory Conditions

Simulation of Sowing Precision in Laboratory Conditions

Structure Dynamics Analysis for Use in Noise Reduction of an Automotive Body-In-White

Finite element analysis and vibration testing of a three-dimensional crane structure

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