Calculation method of locking torque based on elastic thin shell theory for hydraulic locking sleeve

Abstract

The hydraulic locking sleeve is a key component of precision instruments such as five-axis machine tools, giant astronomical telescope, and satellite antenna. This is subjected to the action of pressure load causing large elastic deformation and locking the rotational freedom of feed shaft at any angle. The maximum locking torque is an important parameter for designing the hydraulic locking sleeve. First, the hydraulic locking sleeve is simplified as elastic thin cylindrical shell structure. Neglecting the bending and twisting effects, the calculation equations describing the deformation and stress state between the hydraulic locking sleeve and rotary shaft are derived by applying the theory of elastic thin shell. Then, taking into account that one end of the hydraulic lock sleeve is fixed to the shaft sleeve seat by the end face flange; the calculating formula of the maximum locking torque of the hydraulic locking sleeve is obtained by modifying the deformation equation based on moment model. Finally, a test platform of hydraulic locking sleeve is designed, which can measure the maximum locking torque of the hydraulic locking sleeve. The error between the calculation result of locking torque theoretical calculation model and the experimental measured value is \15%. As a result, the causes of the error are analyzed, and the effects of the shaft sleeve length, wall thickness, and radius on the maximum locking torque are calculated.

Design and Optimization of a Novel Electronic Mechanical Brake Actuator Based on Cam

“…However, compared to the screw mechanism, the disadvantage of the cam mechanism is that it cannot continuously generate movement, so a separate clearance adjustment device [29] is needed to achieve clearance adjustment. In addition, the factors of friction and efficiency were less considered in the above design and analysis process, while in fact, they play an important role in the transmission process.…”

“…The layout structure of the EMB based on a negative radius cam mechanism is shown in Figure 2. Figure 2a is the assembly appearance, and the detailed implementation cases can be found in our patent application [28,29]. Figure 2b is the schematic diagram of the core cam mechanism.…”

“…We have submitted two Chinese patents for this new type of EMB [28,29] Finally, analyze AOB jmax , and ∠AOB j max = ∠AOB j−1 − ∆θ.…”

Accuracy analysis of satellite antenna panel expansion based on BP neural network

“…In the real space environment, the expansion accuracy of the antenna panel is also affected by many factors. For example, the locking error of the hinge is caused by the manufacture and assembly, which has a particularly prominent impact on the expansion accuracy 8–11 . Meanwhile, it is well understood that the error of the pole brace mechanism has a relatively small impact on the expansion accuracy.…”

“…For example, the locking error of the hinge is caused by the manufacture and assembly, which has a particularly prominent impact on the expansion accuracy. [8][9][10][11] Meanwhile, it is well understood that the error of the pole brace mechanism has a relatively small impact on the expansion accuracy. Therefore, this paper mainly analyzes the effect of the hinge locking error on the expansion accuracy of the satellite antenna panel.…”