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Application Of Multibody Dynamic Method (Mbd) And Mechanical Principle To The Cylinder Torque Calculation

Gwo-Chung Tsai, Email:gctsai@niu Tw

2017
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Journal of Multidisciplinary Engineering Science and Technology (JMEST)
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unpublished

In this report, the multibody dynamic method and the mechanical principle is used to calculate the cylinder torque when it is working. The experimental equipment is also set up to measure the torque with different angle of working cylinder. The results obtained from the mechanical principle completely matched with that of multibody dynamic method. But the results obtained from the experimental test and the mechanical principle had a constant deviation values. Therefore, the analytical equation
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... ased on the mechanical principle will add a correct factor to revise the friction effect not considered in the analytical developments. The results can match with each other between the experimental data and that of the analytical method with a correct factor. Keywords-Cylinder Torque, Multibody Dynamic Method, Mechanical Principle, Correct Factor 1. Research Background In this paper, the cylinder torque at different pressures arising from different working angles is studied. In order to design a better cylinder, the central axis at different distances or different air pressure can be applied to derive a basic theory. It is also calculated by the multibody dynamic finite element software and tested by the experiment to verify the results of theoretical analysis. In experimental design, the torque is measured for only 0 degrees, 45 degrees, and 90 degrees that are found in these three angles to do a better measure, because the rest of the angle is difficultly fixed to get the data. In order to observe the torque curve for the cylinder operation, the mechanical principles and computer-aided engineering software (CAE) [1-5] are used to do analyses for all angles 2. Cylinder geometric shape Cylinder geometric shape is drawn by using a CAD program shown in Figure 1 which basically is complicated. Therefore the actual model will be simplified, only the major parts connected to the main part affect the results of the analysis shown in Figure 2. Cylinder diameter is 250mm, the vertical distance between the cylinder center to a rocker arm is 95mm, slider skew angle of the original design is 15 degrees, but the actual skew angle found is only 14.1 degrees, and skew angle will continuously change due to the cylinder process. The length, width and height of the slider are, respectively, 42mm, 30mm, and 17.5mm. The cylinder system is made of carbon steel. The friction is not included in the analytical formula and MBD analysis that may have a deviation from the experimental tests. In the multibody dynamic finite element analysis, all the structural components in the model are assumed to be the rigid body [2, 3] that matched with the mechanical analysis assumption.

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