Mobili žemės ūkio technika neigiamai veikia dirvą dėl varančiųjų ratų didelės apkrovos, buksavimo bei vėžių susiformavimo. Šių procesų pasekmė - dirvos suslėgimas, dirvožemio struktūros ardymas bei sąlygų vandens ir vėjo erozijai susidarymas. Dėl šių priežasčių mažėja derlius ir didėja energijos sąnaudos dirvai įdirbti. Vienas iš būdų optimaliau paskirstyti apkrovą dirvai - keisti slėgį padangose atsižvelgiant į dirvos fizines mechanines savybes. Šiame tiriamajame darbe nagrinėjama oro slėgio padangose įtaka dirvos suslėgimui. Tyrimai atlikti prieš rudeninę sėją, lengvo priesmėlio lauke. Prieš atliekant tyrimus dirva buvo suarta 20 cm gyliu. Dirvos drėgnis 5 cm gylyje buvo 12 %. Tyrimais nustatytas 1,9 MPa mažesnis dirvos slėgis esant 0,5 bar slėgiui padangose lyginant su 2,5 bar slėgiu padangose. Dirvos kietis buvo mažesnis 4,8 karo, 5 cm gylyje, ties armens padu iki 4,1 karto. / Mobile agricultural machinery negatively affects soil due to large load of driving wheels, constant slippage and track formation. Consequently, problems such as soil compaction, damage of soil structure and conditions for water and wind erosion occur. For these reasons, yields decline and energy costs for soil cultivation increase. One of the ways to streamline the distribution of load on soil is to change the pressure in the tires considering on the soil physical and mechanical properties. This research work focuses on the investigation of tire pressure influence on soil compaction. Investigations were carried out before the autumn sowing on a light sandy loam field. Before the tests the soil was plowed 20 cm depth. Soil moisture at a depth of 5 cm was 12 %. The studies revealed that soil compaction of 1,9 MPa was lower at 0,5 bar pressure in the tires compared to the 2,5 bar pressure. Soil compaction was found to be 4,8 times lower in 5cm depth whereas compaction at the tractor track was 4,1 times lower.

Darbo tikslas - atliekant arimo darbus nustatyti traktoriaus buksavimo, degalų sąnaudų bei padangų temperatūros kitimo nuo jo balastavimo ir oro slėgio padangose dydžio priklausomybes. Darbe nagrinėjama balastinės masės ir oro slėgio padangose įtaka traktoriaus eksploataciniams rodikliams. Pateikiami eksperimentiniai tyrimai, kurių metu, keičiant balastinės masės ir oro slėgio padangose reikšmes, buvo matuojamos degalų sąnaudos, varančiųjų ratų buksavimas bei padangų temperatūra. / Work theses - at tillage work investigate tractor wheel skid, fuel consumption and tire temperature dependence from tractor ballast weight and tire pressure. This study investigates a ballast weight and tire pressure influence on tractor’s unit performance. Experimental studies have been performed by changing the weight of ballast and tire pressure values, fuel consumption, wheel skid and tire temperature were measured.

No description available.

A proof-of-concept indirect tire-pressure monitoring system is developed using neural net- works to identify the tire pressure of a vehicle tire. A quarter-car model was developed with Matlab and Simulink to generate simulated accelerometer output data. Simulation data are used to train and evaluate a recurrent neural network with long short-term memory blocks (RNN-LSTM) and a convolutional neural network (CNN) developed in Python with Tensorflow. Bayesian Optimization via SigOpt was used to optimize training and model parameters. The predictive accuracy and training speed of the two models with various parameters are compared. Finally, future work and improvements are discussed.

No description available.

As the introduction of semiconductor¡Bcomputer¡Bnetwork communcation¡Bmulti-media technology¡K¡Ketc. and the development and application of relevant automotive electronics, the car has becoming a high technological product instead of a traditional and machnical conveyance. Based on IC Insights, over 40% of vehicles will be equipped with automotive electronics and the automotive electronics market will reach the scale of US$192 billion in 2010. The scale of market is expected to reach the record of US$400 billion that represented over 50% of vehicles will be equiped with automotive electronics in 2015. The automotive electronics was divided to six functional field including ¡§Powertrain¡¨¡B¡¨Body¡¨¡B¡¨Chassis¡BSecurity¡¨¡B¡¨Safety¡¨ and ¡§Driver information¡¨. According to the research of IEK, ¡§Tire Pressure Monitoring System¡¨ is the most potential product in ¡§Safety¡¨ field for Taiwan manufacturers of IT industry to invest their resource. Based on Strategy Analytics, the global market of Tire Pressure Monitoring System reaches the scale of US$200 million in 2004 and the growth is expected to reach the record of US$1,279 million in 2008 and 63.6% annual compound growth. Quality Function Deployment (QFD) is a systematical tool with customer orientated concept. Adopting QFD method to product design efficiently is able to shorten development time¡Breduce cost and improve quality to satisfy customer¡¦s needs in his or her mind. This research is completed by case study of Tire Pressure Monitoring System (TPMS) which is developed by certain Taiwan company with potentials that is chosen by specialists. In this research we try to collect related information about certain company and explore customer¡¦s real-life needs by conducting questionnaire surveys. Kano¡¦s two-dimensional quality model is applied to identify customer¡¦s critical quality requirements. Quality factor¡Bsub-system/component and process are deployed by the matrix method of QFD to recognize key items for improving product design.

The introduction of the use of Tire Pressure Control Systems (TPCS) to improve the productivity of the Canadian trucking industry is gaining momentum. The imposition of seasonal load restrictions (SLR) on the thaw-weakened secondary roads interrupts the transportation of raw materials to processing facilities For the forestry industry in particular, this has very significant impacts on productivity and costs. FPInnovations-Feric Division (Feric) has investigated the potential for TPCS-equipped trucks to travel with full, legal loading during the SLR period without accelerating road wear and tear. The TPCS monitors and adjusts the inflation pressure of the trucks’ tires while driving and allows the operator to optimize the inflations for changes in loading, travel speed, or road quality encountered in the trip. This thesis describes an investigation to determine whether TPCS can be used to mitigate traffic generated damage to secondary roads and also reduce the need to implement load restrictions. The project involves a partnership with the Ontario Ministry of Transportation Ontario (MTO), Forest Engineering Research Institute of Canada (FERIC), Ontario Ministry of Natural Resources (MNR) and the Centre for Pavement and Transportation Technology (CPATT) located at the University of Waterloo. The thesis will describe the methodology, design, and instrumentation of the two test sites which are located in Dryden, Ontario and Chapleau, Ontario. In addition, repeated Portable Falling Weight Deflectometer (PFWD) testing is being carried out at these sites and the initial results of this examination and associated impacts of the environment and traffic on the road will be presented. This study also involves looking into the reliability of using the portable FWD, offering a lower cost alternative instead of the trailer mounted FWD to monitor pavement strength for the identification the SLR period. The use of innovative sensors and data collection techniques are proving to be very informative and are advancing pavement engineering knowledge. Moreover, the thesis is aimed at exploring the possibilities of achieving the current objectives of the government DOTs such as TPCS potential for addressing the timber industry in crisis, reduced road maintenance budgets, and global warming increasing road damage.

The introduction of the use of Tire Pressure Control Systems (TPCS) to improve the productivity of the Canadian trucking industry is gaining momentum. The imposition of seasonal load restrictions (SLR) on the thaw-weakened secondary roads interrupts the transportation of raw materials to processing facilities For the forestry industry in particular, this has very significant impacts on productivity and costs. FPInnovations-Feric Division (Feric) has investigated the potential for TPCS-equipped trucks to travel with full, legal loading during the SLR period without accelerating road wear and tear. The TPCS monitors and adjusts the inflation pressure of the trucks’ tires while driving and allows the operator to optimize the inflations for changes in loading, travel speed, or road quality encountered in the trip. This thesis describes an investigation to determine whether TPCS can be used to mitigate traffic generated damage to secondary roads and also reduce the need to implement load restrictions. The project involves a partnership with the Ontario Ministry of Transportation Ontario (MTO), Forest Engineering Research Institute of Canada (FERIC), Ontario Ministry of Natural Resources (MNR) and the Centre for Pavement and Transportation Technology (CPATT) located at the University of Waterloo. The thesis will describe the methodology, design, and instrumentation of the two test sites which are located in Dryden, Ontario and Chapleau, Ontario. In addition, repeated Portable Falling Weight Deflectometer (PFWD) testing is being carried out at these sites and the initial results of this examination and associated impacts of the environment and traffic on the road will be presented. This study also involves looking into the reliability of using the portable FWD, offering a lower cost alternative instead of the trailer mounted FWD to monitor pavement strength for the identification the SLR period. The use of innovative sensors and data collection techniques are proving to be very informative and are advancing pavement engineering knowledge. Moreover, the thesis is aimed at exploring the possibilities of achieving the current objectives of the government DOTs such as TPCS potential for addressing the timber industry in crisis, reduced road maintenance budgets, and global warming increasing road damage.