Development and evaluation of vibration isolators for reducing hand transmitted vibration of walking and riding type power tillers

Sam, Bini; Kathirvel, K.

doi:10.1016/j.biosystemseng.2009.04.012

Cited by 20 publications

(10 citation statements)

References 5 publications

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“…And, the more disturbances from the irregularities of the agricultural backgrounds, the worse the smoothness of running of the multi-axle block-modular agricultural tractor. The smoothness of the movement depends, to a great deal, on the traction and dynamic indicators, the productivity and agrotechnical qualities of the operation performed, as well as the durability and economical efficiency of the aggregate [9,10]. The unsatisfactory smoothness of movement of multi-axle modular agricultural tractors reduces the efficiency of their use in agriculture.…”

Section: Introductionmentioning

confidence: 99%

Simulation of elastic-dissipative connection of multi-axle block-modular agricultural tractor modules

Bulgakov

Kuvachov

Ivanovs

et al. 2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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Creation of a tractor according to a modular scheme, by combining the power and the technological modules into a single multi-axle power unit can essentially improve its traction and coupling properties. Research in possibilities how to increase smooth running of a multi-axle block-modular tractor by damping its vertical oscillations due to throttling of the hydraulic system of the rear suspension mechanism of the power module is an urgent task. Synthesis of the connection parameters of the modules of a multi-axle block-modular agricultural tractor was effected by simulating the conditions of its operation on a PC. The model of functioning of a hydraulic suspension mechanism of the power module of a multi-axle block-modular agricultural tractor with a sudden narrowing of the main hydraulic line of the main hydraulic cylinder, as a throttling system, was represented by a combination of elastic and dissipative elements. Creation of a dynamic system with viscoelastic damping by throttling the hydraulic system of the suspension mechanism of the power module allows damping the oscillations of block-modular units in the vertical plane in a wider frequency band (0… 16 s -1 ). In addition, dispersion of the mutual vertical oscillations of the power and the technological modules during the agricultural operations is reduced by more than 3 times, and the allowed vibration load of the operator is ensured.

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Section: Introductionmentioning

confidence: 99%

Simulation of elastic-dissipative connection of multi-axle block-modular agricultural tractor modules

Bulgakov

Kuvachov

Ivanovs

et al. 2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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show abstract

“…A positive by-effect of the technological module is vibration damping of the block-modular aggregate, created by inertia of its weight and the resistance force of the agricultural implement. Investigation of the smooth running of mobile power facilities, transport and machine-and-tractor aggregates, in order to improve their dynamic characteristics, are given in the works by many scientists [6][7][8][9][10][11][12]. In particular, they have proved that the vertical vibrations of agricultural aggregates lead to a change in the dynamic radius of the tractor wheels, and with it, its adhesion weight.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations in vertical vibration damping of agricultural aggregate of block-modular type

Bulgakov

Kuvachov

Ivanovs

et al. 2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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Under conditions of real operation of block-modular aggregates continuous oscillations of external disturbances lead to a decrease in their technical and operational indicators and an increase in specific fuel consumption per unit of the work performed. Evaluation of the performance indicators of a block-modular agricultural aggregate, based on the MTZ-82 serial tractor with a technological module was carried out on the basis of laboratory-field research on ploughing cereal stubble. These investigations were performed by means of a strain gauge measuring complex that recorded signals on a PC, using an analogue-to-digital converter. The results obtained were processed in the Matlab program. Creation of a rational elastic-damping connection between the tractor and the technological module allows obtaining the desired amplitude-frequency and correlation-spectral characteristics of vertical oscillations of a modular agricultural aggregate, reducing the dispersion of the torque oscillations on the tractor power take-off shaft by 10 times. An elastic-damping connection between the tractor and the technological module with a drag coefficient of 1.65 kN•s•m -1 on ploughing has made it possible to reduce by 3-4 times the dispersion of vertical vibrations of the block-modular aggregate, to increase its performance by 6%.

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“…Dewangan et al pointed that the vibration energy absorption (VEA) may provide a better indication of vibration-induced injuries than would a measure of the handle vibration spectrum [12] . Sam and Kathirvel developed a new type of vibration isolators for engine, handle bar and handle were developed to increase the safe exposure level of operators [13] . Kalra et al [14] explored a low-cost system for measurement of coupling forces imposed by the hand on a handle under static and dynamic conditions, and its feasibility for applications to hand-held power tools.…”

Section: Introductionmentioning

confidence: 99%

Analysis and evaluation of vibration characteristics of a new type of electric mini-tiller based on vibration test

Niu¹,

Chen²,

Zhao³

et al. 2019

International Journal of Agricultural and Biological Engineering

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Now the internal combustion engine mini-tiller has become the main and indispensable agricultural machinery in vast hilly and mountainous areas of Southwest China. However, its intense vibration may pose a big threat to operators. As a countermeasure to the tiller vibration, a new type of electric mini-tiller powered with a group of lithium battery and a brushless DC motor was developed. The vibration signals at the handle of the tiller were tested under 6 conditions as follows: the tiller was under states of static and working in the field, at slow, medium and rapid speed, respectively. The signals were processed by means of the time domain eigenvalue analysis and the frequency spectrum analysis. The results show that with the electric motor rated speed increased from 95 to 140 r/min under static conditions, the RMS values increased 122.54%, and with the forward speed increased from 0.30 to 0.80 m/s under working conditions, the RMS values increased 201.78%. When the tiller was working, the first order vibration frequencies were 25.99 Hz, 26.99 Hz and 28.99 Hz at slow, medium and rapid speed respectively, all not within 37.50-65.00 Hz, the sensitive range of human hands to the vibration frequency. In addition, according to the results of hand transmitted vibration analysis, it can be found that compared with operating the internal combustion engine mini-tiller under the same working condition, the onset of vibration-induced white finger can be delayed for 3.70 years to 10.20 years by operation of the new electric tiller.

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Development and evaluation of vibration isolators for reducing hand transmitted vibration of walking and riding type power tillers

Cited by 20 publications

References 5 publications

Simulation of elastic-dissipative connection of multi-axle block-modular agricultural tractor modules

Simulation of elastic-dissipative connection of multi-axle block-modular agricultural tractor modules

Experimental investigations in vertical vibration damping of agricultural aggregate of block-modular type

Analysis and evaluation of vibration characteristics of a new type of electric mini-tiller based on vibration test

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