In this article it is studied the behaviour of a rechargeable battery, which outputs a maximum po... more In this article it is studied the behaviour of a rechargeable battery, which outputs a maximum power capacity of 17 kWh that's being used as the main source of the prototype electric tractor developed at INMA Bucharest. This tractor is equipped with 16 kW electric motor, 4 speed gearbox and 4x4 traction. The charging mode of the battery when it is supplied with different powers from the current source was studied, but also the power delivery mode when the tractor is in operation and different loads occur. The energy consumption of the battery has also been studied, from the moment when the tractor is put into operation, driving on flat asphalt or agricultural land, with or without load and also in extreme traction conditions, for ploughing or towing heavy loads.
Forestry workers are exposed to vibrations from chainsaws which usually are not taken into consid... more Forestry workers are exposed to vibrations from chainsaws which usually are not taken into consideration from the negative impact point of view on their health. However, in time, these vibrations could cause trepidation disease which will affect the worker neuro-muscular and locomotory apparatus. One mean to mitigate the vibrations impact is to measure and determine the worker’s exposure level to vibrations during worktime and to dispose the proper measures to reduce their negative impact. Within this paper will be presented experimental results obtained for vibration data recorded on a chainsaw during wood cutting in real life conditions. The equivalent vibration was measured at both front and end handles level and the biggest value was used for calculation of the human exposure level.
The stability of machines for soil preparation during the work process is influenced by a number ... more The stability of machines for soil preparation during the work process is influenced by a number of variable sizes of which the most important are the soil strength and configuration. The stability of deep soil loosening machines with fixed furrow during the work process is studied like vertical stability for the plow. Less studied in the scientific literature, is the stability of deep soil loosening machines with active furrows powered for the tractors PTO with a quadrilateral mechanism.
Flotation is a method applied very often in wastewater treatment. One way of improving the effici... more Flotation is a method applied very often in wastewater treatment. One way of improving the efficiency of wastewater treatment by flotation is increasing the quantity and stability of foam. For this purpose, in this paper was studied CuFe2O4 oxide nanomaterial for treatment of wastewater containig oil as pollutant. CuFe2O4 was prepared by coprecipitation method and their structural and morphological characterisation was done by XRD and TEM analyses. In order to evaluate their potential of application in wastewater treatment by flotation were invesigated the separation efficiency of oil from wastewater and the quantity and foam stability.
The twenty-first century represents the period of the most remarkable discoveries and transformat... more The twenty-first century represents the period of the most remarkable discoveries and transformations of the human civilization, but also the period of the most important changes regarding the evolution of the environment. At the present stage of the evolution of the society, the knowledge of the behaviour of the world economy cannot be conceived outside the environmental approach, as a system, structure and dynamics, its connections and implications on life on earth. Agriculture is an important source of emission of two greenhouse gases with a significant share in the influence of the global warming process. The key to protecting the environment from the harmful effects of widespread and unsafe farming practices is through implementing sustainable practices. Sustainable agriculture incorporates both the conservation of available resources and the use of agricultural practices aimed at protecting the environment. Given the increasing awareness of the environment and the specific kno...
Deep soil loosening machine MAS 65 is destined to work soil at depths exceeding 45 cm, thus the m... more Deep soil loosening machine MAS 65 is destined to work soil at depths exceeding 45 cm, thus the machine’s frame is subjected to loads which could affect its structural integrity. Within this paper a static structural analysis was performed on the machine’s 3D model using finite element method and strain and stress distribution maps were created. Using the Von Mises stress map there were identified several critical points which could fail during normal exploitation conditions and which should be monitored by strain gages during field tests in order to prevent structural failure.
The article presents a possibility of applying the techniques specific to the drones (UAV) in ord... more The article presents a possibility of applying the techniques specific to the drones (UAV) in order to estimate the efficiency, and optimize the windbreaks (vegetative barriers, forest curtains).In the first part the article presents a variant of determination of the dynamic and optical porosities of forest protection curtains using one or two drones simultaneously. In the second part, ascertaining some language inaccuracies, it observes that the issue of the efficiency of the forest curtains became a problem of mitigation of wind intensity. Finally, the last proposed application shows that using the drones, you can estimate the protected volumes behind the curtains, basically giving up the optical porosity. In order to achieve these applications, there is an essential condition: records of the magnitude of the wind speed and of the coordinates must not be excessively affected by the wind.
The mechanical sorting process of granular and vegetal materials is a complex technological proce... more The mechanical sorting process of granular and vegetal materials is a complex technological process influenced by a series of factors from which we remind: mechanical vibratory motion, geometrical measures of the sorting equipment and technological factors. Based on correlations between the presented elements one can establish the technological parameters of the sorting process so that to realize a quality separation.In the paper we present a method for determination of mechanical oscillations influence on the quality of the sorting process with planar sieves. The experiments performed on a dimensional sorter with planar sieves aimed at identification of an optimum working set-up in terms of frequency and amplitude of the sorter’s vibrators, for a quality separation degree.
Volume mainly contains a large number of examples of structural analysis in the hands and farm eq... more Volume mainly contains a large number of examples of structural analysis in the hands and farm equipment. Examples are organized by type of structural modeling on industrial issues and key areas of structural analysis.The book includes work experience in structural analysis over 15 years of collective development. The volume includes chapters working methods and strategy teams structural analysis, aiming to optimize their activity. This paper addresses the design and conception technicians engaged in industrial equipment in testing. Also this paper addresses and those involved in the failures of structures and expertise in optimizing structures.
In this article it is studied the behaviour of a rechargeable battery, which outputs a maximum po... more In this article it is studied the behaviour of a rechargeable battery, which outputs a maximum power capacity of 17 kWh that's being used as the main source of the prototype electric tractor developed at INMA Bucharest. This tractor is equipped with 16 kW electric motor, 4 speed gearbox and 4x4 traction. The charging mode of the battery when it is supplied with different powers from the current source was studied, but also the power delivery mode when the tractor is in operation and different loads occur. The energy consumption of the battery has also been studied, from the moment when the tractor is put into operation, driving on flat asphalt or agricultural land, with or without load and also in extreme traction conditions, for ploughing or towing heavy loads.
Forestry workers are exposed to vibrations from chainsaws which usually are not taken into consid... more Forestry workers are exposed to vibrations from chainsaws which usually are not taken into consideration from the negative impact point of view on their health. However, in time, these vibrations could cause trepidation disease which will affect the worker neuro-muscular and locomotory apparatus. One mean to mitigate the vibrations impact is to measure and determine the worker’s exposure level to vibrations during worktime and to dispose the proper measures to reduce their negative impact. Within this paper will be presented experimental results obtained for vibration data recorded on a chainsaw during wood cutting in real life conditions. The equivalent vibration was measured at both front and end handles level and the biggest value was used for calculation of the human exposure level.
The stability of machines for soil preparation during the work process is influenced by a number ... more The stability of machines for soil preparation during the work process is influenced by a number of variable sizes of which the most important are the soil strength and configuration. The stability of deep soil loosening machines with fixed furrow during the work process is studied like vertical stability for the plow. Less studied in the scientific literature, is the stability of deep soil loosening machines with active furrows powered for the tractors PTO with a quadrilateral mechanism.
Flotation is a method applied very often in wastewater treatment. One way of improving the effici... more Flotation is a method applied very often in wastewater treatment. One way of improving the efficiency of wastewater treatment by flotation is increasing the quantity and stability of foam. For this purpose, in this paper was studied CuFe2O4 oxide nanomaterial for treatment of wastewater containig oil as pollutant. CuFe2O4 was prepared by coprecipitation method and their structural and morphological characterisation was done by XRD and TEM analyses. In order to evaluate their potential of application in wastewater treatment by flotation were invesigated the separation efficiency of oil from wastewater and the quantity and foam stability.
The twenty-first century represents the period of the most remarkable discoveries and transformat... more The twenty-first century represents the period of the most remarkable discoveries and transformations of the human civilization, but also the period of the most important changes regarding the evolution of the environment. At the present stage of the evolution of the society, the knowledge of the behaviour of the world economy cannot be conceived outside the environmental approach, as a system, structure and dynamics, its connections and implications on life on earth. Agriculture is an important source of emission of two greenhouse gases with a significant share in the influence of the global warming process. The key to protecting the environment from the harmful effects of widespread and unsafe farming practices is through implementing sustainable practices. Sustainable agriculture incorporates both the conservation of available resources and the use of agricultural practices aimed at protecting the environment. Given the increasing awareness of the environment and the specific kno...
Deep soil loosening machine MAS 65 is destined to work soil at depths exceeding 45 cm, thus the m... more Deep soil loosening machine MAS 65 is destined to work soil at depths exceeding 45 cm, thus the machine’s frame is subjected to loads which could affect its structural integrity. Within this paper a static structural analysis was performed on the machine’s 3D model using finite element method and strain and stress distribution maps were created. Using the Von Mises stress map there were identified several critical points which could fail during normal exploitation conditions and which should be monitored by strain gages during field tests in order to prevent structural failure.
The article presents a possibility of applying the techniques specific to the drones (UAV) in ord... more The article presents a possibility of applying the techniques specific to the drones (UAV) in order to estimate the efficiency, and optimize the windbreaks (vegetative barriers, forest curtains).In the first part the article presents a variant of determination of the dynamic and optical porosities of forest protection curtains using one or two drones simultaneously. In the second part, ascertaining some language inaccuracies, it observes that the issue of the efficiency of the forest curtains became a problem of mitigation of wind intensity. Finally, the last proposed application shows that using the drones, you can estimate the protected volumes behind the curtains, basically giving up the optical porosity. In order to achieve these applications, there is an essential condition: records of the magnitude of the wind speed and of the coordinates must not be excessively affected by the wind.
The mechanical sorting process of granular and vegetal materials is a complex technological proce... more The mechanical sorting process of granular and vegetal materials is a complex technological process influenced by a series of factors from which we remind: mechanical vibratory motion, geometrical measures of the sorting equipment and technological factors. Based on correlations between the presented elements one can establish the technological parameters of the sorting process so that to realize a quality separation.In the paper we present a method for determination of mechanical oscillations influence on the quality of the sorting process with planar sieves. The experiments performed on a dimensional sorter with planar sieves aimed at identification of an optimum working set-up in terms of frequency and amplitude of the sorter’s vibrators, for a quality separation degree.
Volume mainly contains a large number of examples of structural analysis in the hands and farm eq... more Volume mainly contains a large number of examples of structural analysis in the hands and farm equipment. Examples are organized by type of structural modeling on industrial issues and key areas of structural analysis.The book includes work experience in structural analysis over 15 years of collective development. The volume includes chapters working methods and strategy teams structural analysis, aiming to optimize their activity. This paper addresses the design and conception technicians engaged in industrial equipment in testing. Also this paper addresses and those involved in the failures of structures and expertise in optimizing structures.
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