Wyniki wyszukiwania - BazTech

1

Tire and Engine Sources Contribution to Vehicle Interior Noise and Vibration Exposure Levels

Abouel-Seoud Shawki

Archives of Acoustics

|

2019

|

Vol. 44, No. 2

201--214

EN

The main objective of the research presented in this paper is to enhance driver-passengers Comfort of a vehicle that in turn leads to better vehicle safety and stability. The focus was put on studying the interior vibration and noise contributions originated from tire-road and engine-transmission subsystems, due to their significant impact on the dynamic performance of the vehicle. The noise and vibration measurements were recorded at the driver’s head position and on the driver legs room. Furthermore, the influence of different tire types and road surface textures on the vehicle interior noise and vibration were considered. The results indicate that the widely used conventional engine mounts and tires in commercial vehicles cannot fulfill the conflicting requirements for the best isolation concerning both road surface and engine-transmission induced excitations. The values of driver’s head position sound pressure level and floor vibration acceleration broadband averages originate for engine-transmission are lower than that for tire-road interaction. Furthermore, the values of RMS, crest factor, kurtosis and IRI for the vehicle waveform were estimated for vehicle speeds, tire types and road surface textures. Moreover, the percentage contribution for both interior noise and vibration originated from tire-road interaction is higher than the one from vehicle engine-transmission system in all the vehicle speed range, tire type and road surface texture considered.

2

Adaptive tracking of road vehicle engine speed based on acceleration measurements

Krauze P.

Selected Engineering Problems

|

2012

|

nr 3

111--118

EN

The paper presents adaptive approach to a method of vehicle engine speed tracking based on acceleration measurements which are taken in the vehicle body part. Engine-induced vibrations, which are acquired using a vehicle measurement system, as strongly nonlinear can be modelled using multi-notch filter. It was stated the optimal parameter of the multi-notch filter exists; however, solution space function of the optimization problem is significantly nonlinear. For such conditions adaptive LMS algorithm, which includes multi-notch filter, tends to converge to local minimum points of the solution space. Cross-correlation estimation of multi-notch filter output and its delayed version as well as power estimation of engineinduced acceleration signal were used to tune online an adaptation constant of LMS algorithm and bandwidth parameter of multi-notch filter. Results obtained for stationary and nonstationary engine-induced vibrations justified high accuracy of the tracking algorithm.

3

Assessment of possibility to improve dust suction efficiency from multicyclone air filter of track vehicle.

Dziubak T.

Zagadnienia Eksploatacji Maszyn

|

2007

|

Vol. 42, nr 1

107-127

EN

The dust sucking-off from the deduster of multicyclone of the caterpillar vehicle two-stage filter process organisation is presented. There is shown the influence of sucking-off degree on dedusting effectiveness of inertial deduster. Experimental researches of multicyclone construction influence on uniform rate of the dust sucking-off from the individual cyclones were carried out. There was made the analysis of effectiveness improvement possibilities of dust sucking-off from the multicyclone deduster. There is shown the design of deduster modification consisting of deduster chamber segmentation on independent, isolated one from another sucking-off canals. To every canal there are allocated some individual cyclones. Heights of sucking-off on its outlet h1, h2, h3, h4 are computed under the criterion of the same air flow drag through the canals. Suitable flow computations are carried out using a computational model of dust settler worked out by the author. There was carried out a three-stage experimental evaluation of introduced constructional changes of multicyclone dust settler on values of sucking-off streams QSC from individual cyclones.

PL

Przedstawiono organizację procesu odsysania pyłu z osadnika multicyklonu filtru dwustopniowego pojazdu gąsienicowego. Pokazano wpływ stopnia odsysania na skuteczność odpylania odpylacza bezwładnościowego. Wykonano badania eksperymentalne wpływu konstrukcji multicyklonu na równomierność odsysania pyłu z pojedynczych cyklonów. Przeprowadzono analizę możliwości poprawy równomierności odsysania pyłu z odpylacza multicyklonowego. Przedstawiono projekt modyfikacji osadnika pyłu polegający na podziale komory osadnika na niezależne, odizolowane od siebie kanały odsysania. Wysokości kanałów odsysania na wylocie h1, h2, h3, h4 dobrano obliczeniowo pod względem jednakowych oporów przepływu strumienia powietrza przez kanały. Odpowiednie obliczenia przepływowe wykonano wykorzystując model obliczeniowy osadnika pyłu opracowany przez autora. Przeprowadzono trzyetapową eksperymentalną ocenę wpływu wprowadzonych zmian konstrukcyjnych osadnika pyłu multicyklonu na wartości strumieni odsysania z pojedycznych cyklonów.

4

Model osadnika pyłu multicyklonu filtru powietrza silnika pojazdu terenowego eksploatowanego w warunkach dużego zapylenia powietrza.

Dziubak T.

Zagadnienia Eksploatacji Maszyn

|

2002

|

Vol. 37, nr 2

155-170

PL

Przedstawiono możliwość poprawy równomierności odsysania pyłu z pojedynczych cyklonów multicyklonowego filtru powietrza polegającą na zmianie formy konstrukcyjnej osadnika pyłu. Zaproponowano sposób zapewnienia równomiernego odsysania strumieni z pojedynczych cyklonów, polegający na podziale komory osadnika multicyklonu na niezależne segmenty mające odizolowane od siebie kanały odsysania, którym przyporządkowano określoną liczbę cyklonów. Ideę podziału na segmenty i kanały odsysania przedstawiono na przykładzie multicyklonu filtru powietrza silnika czołgu T-72. Przedstawiono model fizyczny i matematyczny konstrukcji segmentu osadnika pyłu. Wykonano obliczenia wysokości kanałów odsysania. Przeprowadzono eksperymentalną weryfikację modelu osadnika pyłu.

EN

The reasons of the lowered purification efficiency for multicyclone in comparison to individual cyclone are given. The need of multicyclone air filters dust settlers construction improvement for combat vehicles is substantiated. The methods causing improvement of dust sucking-off equality from individual cyclones are described. It is proved that for tank multicyclone filter the best method is dust settler chamber dividing on independent segments and sucking-off canals. This dividing is presented for T-72 tank air filter dust settler. The settler chamber is divided on five independent segments and a segment on three separated sucking-off canals. On the upper plate of each dust settler segment, the seven rows of cyclones are mounted, three on each row. A defined number of cyclones are assigned to each canal. The first and second canals suck-off the air from the six cyclones settles in two rows. To the third canal three last rows of cyclones are assigned. A mathematical and physical models of vehicle engine multicyclone air filter dust settler is worked out. The assumptions of the model and computing algorithm are presented. The idea of the dust settler model is to choose such hight of sucking-off canals that pressure loses in each canal are identical. The numerical computations of three sucking-off canals hights are done for T-72 tank air filter dust settler segment. A segment of dust settler with sucking-off canals with hights according to computation results was built. An experimental test of proposed method for T-72 tank air filter segment was conducted. The sucking-off streams from individual cyclones for border columns and rows before and after segment dividing on sucking-off canals are appreciated. The flow researches have shown considerable but insufficient improvement of sucking-off equality from individual cyclones. So a change of assigned cyclones number to individual canals and increase of sucking-off canals number is proposed.

5

Problemy odsysania pyłu z multicyklonu filtru powietrza silnika pojazdu mechanicznego eksploatowanego w warunkach dużego zapylenia powietrza.

Dziubak T.

Zagadnienia Eksploatacji Maszyn

|

2001

|

Vol. 36, nr 1

157-178

PL

Przedstawiono organizację procesu odsysania pyłu z odpylacza bezwładnościowego powietrza wlotowego do silników spalinowych pojazdów mechanicznych. Przedstawiono wpływ stopnia ejekcyjnego odsysania odseparowanego pyłu na charakterystyki przepływowe i skuteczności odpylania powietrza w pojedynczych cyklonach. Dokonano oceny stosowanych rozwiązań konstrukcyjnych odsysających układów ejekcyjnych odpylaczy oraz ich wpływ na równomierność odsysania pyłu z pojedynczych cyklonów. Przedstawiono możliwości poprawy równomierności odsysania pyłu z multicyklonu.

EN

The dust sucking-off from the inertial deduster of the vehicle combustion engines inlet air process organisation is presented. Various ejector configurations used for dust sucking-off from the inertial dedusters dust settlers are described. On the base of from the dust settler of tank T-55A air filter multicyclone dust sucking-off system, the method of sucking-off stream extortion by exhaust gases stream flowing from the engine is described. The definition of sucking degree mo, which is the sucking intensity measure, is quoted and values range in which it is closed is given. The influence of dust sucking from dust settlers on the air in multicyclone purification efficiency increase is described and a trial of this phenomenon explaining is presented. The influence of dust sucking on purification efficiency and flow drag characteristics change for two individual cyclones: returnable with a tangent inlet which is used in caterpillar-wheel vehicle multicyclones and passing axial cyclone. For the same sucking degree mo, the values of purification efficiency for individual cyclone and multicyclone deduster consisting of several such cyclones are comparised. The multicyclone purification efficiency is substantially lower than purification efficiency for individual cyclones from which multicyclone is built. It was laid down, that the cause of lower purification efficiency for multicyclone could be various sucking stream values from individual cyclones. The appreciation of sucking systems constructional solutions of combustion engines inlet air ejection inertial dedusters is done. The dust settler construction, which is a common dust tank for several cyclones, and the way of cyclones in multicyclone distribution influence on sucking streams values from individual cyclones is presented. It is proved, that the sucked streams from the cyclones placed far from sucking pipe are about 50% lower than streams from cyclones which are directly by the pipe. The improve possibilities of dust sucking-off equality from multicyclone related mainly to change of dust settler constructional form are presented. Four proposals of dust settler modernizations aimed to achieve of equal sucking streams from individual cyclones are described.