experimental investigation in acceleration of vehicles

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ENGINEERING FOR RURAL DEVELOPMENT Jelgava, 27.-28.05.2010.rpmj zj xvj yFig. 1. APM curve while driving at a speed of 60 km·h -1Figure 1 shows the monitor window during the experiment on gravel road at speed v = 60 km·h -1 .From the acceleration curves of the data selection, the curves are designed in Figure 2. A separateincreased vertical acceleration curve can be seen on Figure 3.1412Acceleration m•s -2108642X axleY axleZ axle0-20 10 20 30 40 50 60 70 80 90 100MeasurmentFig. 2. Value of acceleration driven at a speed of 60 km·h -1The car body frequency at 60 km·h -1 on the bottom of travel:1 1n sv 60= = = 1.05 [Hz] (2)T 0.95The average vertical acceleration in this mode was 0.82 m·s -2 , the maximum vertical accelerationat 2.57 m·s -2 ; as Table 1 shows this treatment results in human motion discomfort. The oscillationperiod T was calculated between the major peaks in the measurement range. Each subsequentmeasurement is recorded on each of 0.05 s. In-between the 1 st and 2 nd highest peak there were 19measurements.To analyse the mutual acceleration values demonstratively in different driving regimes Figure 4was developed where the average acceleration values in the researched motion regimes aresummarized. With increasing of the motion speed on gravel roads the vertical acceleration has atendency to decrease at 70-80 km·h -1 , that could be related to coincidence of the body oscillationfrequency with the suspension oscillation frequency or resonance.152
ENGINEERING FOR RURAL DEVELOPMENT Jelgava, 27.-28.05.2010.13Acceleration, m·s -212111098Z axle70 10 20 30 40 50 60 70 80 90 100Measurement1.20Fig. 3. Vertical acceleration values-2Acceleration, m·s1.000.800.600.400.670.41 0.420.680.820.480.490.970.200.0020 30 40 50 60 70 80 90-1Speed, km·hFig. 4. Vertical acceleration changes in various driving modesConclusions1. Automotive suspension systems may be suitable for different motion modes, and the roadconditions and influences, mainly the car running smooth, handling and acceleration in thetransverse direction.2. The developed experimental methodology was approved and recommended for use in furtherresearch. In the next stages of the research the operation journal is to be replaced by synchronizedweb-cameras.3. Increasing the movement velocity on the bottom of the road surface, the vertical acceleration hasa tendency to decline at 70 to 80 60 km·h -1 , which could be related to coincidence of the body selfoscillation frequency with the suspension oscillation frequency, or resonance.4. Determining the frequency of various modes of technical regimes, it can be determined by whatoptimal rate people should be transported to feel comfortable in the particular vehicle.References1. Wong J.Y. Theory of Ground Vehicles. 3 rd ed. John Willey & Sons, INC, 2001. 528 p.2. Berjoza D. Automobiļu teorija (Automobile theory). Jelgava: LLU, 2008. 200 p. (In Latvian).3. Pommers J., Liberts G. Automobiļa teorija (Automobile theory). Rīga: Zvaigzne, 1985. 240 p. (InLatvian).153
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