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Comparison of the hysteresis loops occurring under the condition of cyclic loading dual leaf spring within the time: t = 0, 100, and 340 min.

Comparison of the hysteresis loops occurring under the condition of cyclic loading dual leaf spring within the time: t = 0, 100, and 340 min.

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Article
Full-text available
The article deals with investigations of a prototype single and double multi-leaf spring composed of a four-leaf main spring and a double-leaf supporting spring subjected to the cyclic loads. A methodology of a measurement conducted during experimental tests and a set of research instruments used in the stand research allow evaluation of the effect...

Contexts in source publication

Context 1
... and analytical approaches A real characteristic of the suspension (the single or dual multi-leaf spring) with a hysteresis loop provides the basis for determining the value of the dissipative energy (e.g. Figures 6 and 9) for different values of the load parameters. ...
Context 2
... One course (one vibration period) within the range of full deflection of the suspension is chosen for the analysis. With a discrete set of experiment and FE results for P = F(f) functions (Figures 6 and 9), the values of the following variables were calculated. ...
Context 3
... energy of loading and dissipative energy were determined by means of numerical integration of the area under the line of the force-displacement chart, P = F(f) (Figure 6). Excel software was used to prepare the charts. ...
Context 4
... of the hysteresis loops which occurred under the condition of cyclic loading the dual leaf spring within the time: t = 0, 100, and 340 min are shown in Figure 6. The dynamical parameters of the dual spring are determined based on the methodology described in section ''Experimental and analytical approach.'' ...
Context 5
... dynamical parameters of the dual spring are determined based on the methodology described in section ''Experimental and analytical approach.'' Load energy and dissipative energy during cyclic loading the leaf spring according to loops recorded during the experiment periods represented in Figure 6 are compared in Table 3. Table 3 includes information on the share of dissipative energy during the cyclic load in the charts of the loop recorded in the maximum duration of the considered test. A diagram of the specific damping capacity changes as a function of the research time and approximations of the measurement results is presented in Figure 7. ...
Context 6
... Values of the dissipative energy are determined on the basis of hysteresis loops ( Figure 6) for the load conditions given in Table 3. 7. Based on the experimental results (Table 3), it is found that the value of energy dissipation increases with an increasing time of exposure to cyclic loading. 8. ...
Context 7
... The specific damping capacity C ( Figure 6) increases with respect to the beginning of the experiment (t = 0 min) by approximately 14% (t = 100 min) followed by 37% (t = 340 min). For the estimated time of an impact of the cyclic loading (t = 600 min, Figure 5), its value increased to 67%. 9. ...

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Citations

... The car weighs approximately 12 tons, and is equipped with a seven leaf (prototype) spring with mapped leaf geometry, together with the interaction mechanism of the leaf surfaces. Analysing the working conditions of the multi-leaf spring, it can be clearly observed that they change continuously during its operation [16]. Initially, there is usually a layer of graphite grease between the leaf springs, which is gradually removed during its lifecycle, as the leaf's work together. ...
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This article presents a simulation study of the suspension system in a vehicle that weighs approximately 12 tons (class N2). The authors have tested the influence of experimentally determined values of friction coefficients on the energy dissipated in the multi-leaf spring. The study was carried out using finite element analysis with LS-DYNA software. A nonlinear vibration model of the complete spring was developed, including the variable friction forces between the leafs. The model takes into account the sprung and unsprung mass of the chassis. Numerical tests were carried out using three different coefficients of friction (determined experimentally) for a selected speed of the car. Random realizations of the road micro-profile (type A, B, C) recommended by ISO 8608 were used. The results of the tests were presented in the form of acceleration curves in the vertical direction, comparative plots of daily vibration exposure A(8) and vibration transmission coefficient (T), and the distributions of RMS acceleration in frequency of one-third octave bands. This data was used to assess the quality of the vibration isolation system between the front suspension of the vehicle and the driver’s seat.
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The article presents the results of semi-elliptic spring stiffness testing. The tests were carried out on a spring mounted in two different methods. One was clamped with U-bolts (similarly as in trucks) and in the case of the other, leaves were fastened together with a central screw. Next, numerical models of both springs were made and the obtained results were compared. An analysis of the results received from the developed calculation model was performed. The relevant conclusions from the studies have been drawn.