Passive fluxgate control of structural transformations in structural steels during thermal cycling

Self Cite

The problem of speeding up and reducing cost of road construction without sacrificing their quality can be solved by creating a complex of units of continuous operation. The aggregates, in sequence, carry out the whole complex of works aimed at road construction. The use of satellite navigation opens up broad prospects for full automation of the aggregates, so the overall goal is to create a complex of aggregates that carry out the continuous construction of roads, mainly in automatic mode. One of the devices which are part of the units of continuous operation is a bucket wheel type agitator. The use of direct-flow rotary rippers for soil development is restrained by insufficient theoretical justification of their parameters. Before analyzing the interaction of the elements of bucket wheel type agitator with the ground, it is necessary to clarify the design layout of the bucket wheel type rotor. Some design parameters of the bucket-wheel type agitator are derived from logical reasoning. Other parameters of a bucket wheel type agitator are obtained by plotting the impact of the blade on the ground in the plane and spatial simulation. The conclusion about the necessity to install a small rotor in addition to the large rotor coaxially with it has been drawn from here. The feed to the end-knife, i.e., the thickness of the layer cut by the end-knife, has been determined. Based on the adopted methodology, the geometric and operating parameters of a large bucket wheel type agitator rotor have been determined. Maximum small radius of circumferential and end knives of the big rotor is established. To excavate near the rotational axis of the bucket-wheel type agitator, a small rotor with a higher angular velocity must be installed in coaxial alignment.

Section: Resultsmentioning

confidence: 99%

Retracted Article: Design layout of the cutting unit and operating parameters of the bucket wheel type agitator

Scherbakov

Breskich²,

Spitsov³

et al. 2023

Self Cite

“…It should be noted that there was no levelling of the loading surface immediately after loading as the objective was to approximate the experiment as closely as possible to the actual transport of goods. Therefore, only a qualitative assessment of load displacement can be made from the results of load level measurement [11,12,13,14].…”

Section: Resultsmentioning

confidence: 99%

Retracted Article: Effects of bulk cargo displacements on changes in truck axle loads

Scherbakov

Пушкарев²,

Kuzmin³

et al. 2023

Self Cite

Changes in road legislation and trucking regulations have led to the need to take into account the maximum axle loads that arise during road transport. In particular, this task is relevant when transporting bulk cargo because when braking or accelerating trucks (road trains), when driving on a longitudinal gradient, or when driving on curves, there can be a displacement of part of the cargo relative to the axles of the vehicle. In article results of experimental research of displacements of loose cargo (gravel, crushed stone) at transportations and their influence on change of axle loadings of cargo vehicles are resulted. During the research the level of loose cargo in semitrailer truck-trailer before and after the experiment was measured, axle load weighing and full train weight weighing was made, in addition video recording of loose cargo displacement was made. Conducting the analysis of experimental data of axial weighing we found out that during transportation of loose cargo its redistribution inside semi-trailer takes place, and it in its turn leads to change of axle loads of road-train. The axle load variations were outside the measurement error range of 1.4 to 4.9%. A further proof of the shifting of the bulk load in the semi-trailer was the video recording of the load in transit. The analysis of the videos showed that both crushed stone and gravel shifted in the semitrailer when the vehicle was moving at high speed. As a result of this work, an experimental confirmation of the fact that the bulk cargo is shifted relative to the sides of the semi-trailer during braking and this shift leads to changes in the axle loads of trucks was obtained.

“…The sources of distortion can be various units of mechanisms and systems of the roller, as well as electrical interference to the recording equipment. From experience of previous studies [11,12,13,14,15] it was decided to use for digital signal processing a low-pass filter with boundary frequency 200 Hz in "Formula" tool of ZETLAB ANALIZ software package. In the Fig.…”

Section: Methodsmentioning

confidence: 99%

Retracted Article: Experimental studies on soil compaction using BOMAG BW 226 BVC-5 vibratory roller

Breskich

2023

Mathematical modelling is used to assess the influence of various factors on the result of soil compaction with a vibratory roller. Verification of the mathematical model is carried out by comparing it with the results of experimental studies. Expanding the list of roller models in the experimental studies allows expanding the range of conditions for verification of the mathematical model. The paper presents the results of experimental studies of soil compaction by a vibratory roller BOMAG BW 226 BVC-5. Data on the change in the value of the dynamic deformation modulus of the Evd soil were obtained in relation to the number of roller passes during the compaction of the sand-gravel mixture with a layer thickness of 0.5 m. The peculiarities are revealed, which is reasonable to consider when carrying out further experimental research. Experimental studies of the range of vertical movements of the drum, as well as vertical accelerations of the drum and its frame, were performed on a BOMAG BW 226 BVC-5 vibrating roller during compaction of the sand-gravel mixture. The compaction result after each pass was evaluated using the value of the dynamic deformation modulus Evd, measured using a ZORN ZFG 3.0 dynamic loading unit. In the experiment, the vertical movements of the vibrating roll were recorded using a BAUMER OADM 13U6480/S35A laser sensor. The accelerations of the vibrating roll and the roll frame were recorded using piezoelectric accelerometers of models AR2099-100 and AR99-100. When processing the readings of the sensors, digital signal processing technology was used - low-pass filters with the boundary frequency of 200 Hz. The research was carried out at two sites with different soil moisture conditions. The results obtained show that the oscillation range of the roll as well as the amplitude values of vertical accelerations of the roll and the frame of the roll increase slightly with increasing soil deformation modulus Evd. The results of this experiment correlate with the research conducted on roller models. The results of the experiment will help to further verify the mathematical model of the roller and to carry out experimental studies of a similar nature.