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Combining multi-field information fusion theory with the ammunition feeding system, a multi-level information fusion method for fault detection and prediction is proposed in this paper. Firstly, it is studied that the occurrence and development mechanism of damage and failure of complicated ammunition feed system under rapid impact. The wear damage and stop shooting faults are diagnosed by measuring...
Gears are used in different industries from machine and equipments manufacturing to automotive industry, from energy industry such as steam and hydraulic turbines, wind turbines to aeronautics such as helicopter and aero plane industries. There is an increasing demand for gears which work at high speeds and carry high loads, so there is more need for gear research and development activities on gear...
The second-throat adjustment sheet is a key part for accurately and quickly adjusting Mach number of test section, so it is greatly significant to research the multi-condition dynamic behavior of the second-throat adjustment sheet for the high-accuracy Mach number adjustment of test section. The experimental research method is adopted to research the dynamic behavior of the second-throat adjustment...
The desirable vibration performance of the second throat centrebody of transonic wind tunnel is one of the key technologies that realize high-precision and rapid regulation of the Mach number in the wind tunnel test section. The vibration of the open centrebody of the second throat in the transonic wind tunnel is strong. The numerical simulation and test methods are adopted to conduct a study on dynamic...
The objective of the study is to determine an optimal flap damping configuration and flapping hinge location to achieve minimum hub and fuselage vibration levels simultaneously. An aeroelastic analysis of two soft in-plane two-bladed rotor is performed in conjunction with optimal control. A multi-objective bat algorithm (MOBA) approach was used to obtain the optimal design point. Under constraint...
In this research, the vibration of a rotating functionally graded carbon nanotube reinforced composite (FG-CNTRC) blade is studied and an active controller scheme is applied to damp these vibrations. The composite blade has been reinforce by single walled carbon nanotubes. The material properties of the FG-CNTRC blade are assumed to be graded in the thickness direction of the beam. These properties...
This paper presents a dimensionless characteristic indicator for automatic bearing fault diagnosis based on ensemble empirical mode decomposition (EEMD). Firstly, the bearing vibration components called the Intrinsic Mode Functions (IMFs) are obtained by EEMD. Secondly, all IMFs are selected to reconstruct a new signal according to the rule of the kurtosis greater than 3. Then the new signal is processed...
In order to reduce the initial disturbance and improve the stability of air defense missile, the missile launching equations of motion are derived and simplified using the method of modal substitution. Based on these equations, the coupled rigid-flexible dynamic modeling is built in the ADAMS software to analyze the dynamic behavior and stability of missile launching process. The results indicate...
An audiovisual feedback is used on touch screens in portable electronic devices. When these devices are used in noisy and distracting environments, suitable available feedback methods is severely inadequate and the availability of the device severely reduced. For these reasons, touch screen technology has become a popular recently. These panels used in many sectors such as watches, cars, mobile devices,...
Audiovisual feedback generally is used on touch screens on portable electronic devices, which are frequently used in daily life. Tactile feedback is one of the issues that have recently gained importance in this technology. Tactile feedback occurs by stimulating the nerves at the fingertip by moving the touch screen. In this study, we have determined the vibration characteristics of touchscreens made...
In this paper, the nonlinear dynamic behavior of the pre-twisted blades based on the Timoshenko beam theory has been investigated. The main purpose of the present work is to study the nonlinear dynamic response of uniform, rotating, cantilever pre-twisted blades. To this end, firstly, the coupled nonlinear equations of motion considering diverse parameters such as the hub radius, rotating velocity...
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