Abstract: In this paper, an adaptive and controlled oil bidirectional separation filter system is designed to realize the adaptive switching of the corresponding filter module according to the results of cutting fluid type, and complete the filtration process of different types of machine tools under the conversion of dual-module filter module. Read More

Abstract: This paper presents a comprehensive review of the current state and development trends in the research on centrifugal pump noise. It first analyzes the primary sources of noise in centrifugal pumps, including mechanical noise, fluid-induced noise, and structural noise. Subsequently, it discusses in detail the main research methods employed in this field, covering experimental measurement techniques, numerical simulation approaches, and theoretical analysis methods. Finally, the paper provides a prospective outlook on future research directions, highlighting emerging trends such as interdisciplinary research, intelligent monitoring and control technologies, the application of novel materials and structural designs, as well as green design and sustainable development. This review aims to offer valuable insights and references for the continued advancement of research in centrifugal pump noise. Read More

Abstract: Industrial robots are the most representative equipment in the field of intelligent manufacturing. The fault problem of industrial robots is prominent, which seriously affects the safe production and economic benefits of enterprises. For these reasons, the fault diagnosis and fault-tolerant technology of industrial robots gradually become the focus of research. This paper first summarizes all kinds of common faults of industrial robots, and then gives an overview of the fault diagnosis methods of industrial robots from three aspects, summarizes the fault-tolerant technology. Finally, looks forward to the future development trend of fault diagnosis and fault--tolerant technology of industrial robots, points out that the integration of mixed fault diagnosis methods and fault-tolerant technology of industrial robots will be the development trend in the future. Read More

Abstract: Among the common vehicle-mounted radars, vehicle-mounted millimeter-wave radar is an important component of vehicle-mounted sensors. The core of the vehicle-mounted millimeter-wave radar system is its signal processing module. Signal processing algorithms based on digital signal processing technology have extremely important and far-reaching significance for the research and development of vehicle-mounted millimeter-wave radar. This paper analyzes the overall structure and basic working principle of the vehicle-mounted millimeter-wave radar system, designs a signal processing algorithm structure scheme of "Beat - Beamforming - Fourier spectrum analysis -MTD", and studies three key algorithms involved in FMCW radar signal processing: CFAR detection, MTD technology, and MTD velocity pairing method. Read More

Abstract: Aiming at the problem that most of the traditional medical endoscopic ultrasound signal transmission systems adopt single-pulse excitation signals, resulting in a relatively small ultrasonic transmission power and affecting the imaging quality of the system, a medical endoscopic ultrasound signal transmission system based on coded excitation technology was studied. The advantages of the encoded excitation signal over the traditional pulse excitation signal were analyzed. Four common encoded signals and their characteristics were comprehensively evaluated, and it was determined to use the Barker code as the system encoded signal. The signal transmission system was constructed by using MD1210 and TC6320. The experimental results show that this signal transmission system can effectively output the encoded excitation signal and transmit it to the ultrasonic transducer. Read More

Abstract: This paper focuses on the special operating conditions of shielded motors in liquid environments, using a 7kW aviation pump shielded motor as a case study. A systematic analysis of its multi-physics coupling characteristics is conducted to reveal the effects of the interaction between different physical fields on the motor. First, by combining practical operating conditions, the inherent frequencies and vibration modes of the rotor system of the immersion liquid shielded motor are compared under different conditions. Then, based on the fluid field, a fluid-structure coupling analysis is performed to solve for the prestressed modal frequencies. The results show that multi-physics coupling analysis of the rotor system provides a more accurate representation of the motor's operational characteristics compared to conventional analyses and should not be overlooked. This provides a reference for the design and optimization of such motors. Read More

Abstract: Advancements in drilling technology and the increasing demand for complex drilling fluids have revealed the limitations of conventional solid control systems, driving the need for innovation. This paper proposes a cylindrical vibrating screen with coupled rotation and vibration, which improves solid-liquid screening efficiency and large particle agglomeration compared to traditional planar screens. The efficiency of a vibrating screen depends on factors such as frequency, rotational speed, amplitude, and inclination angle, making optimization of these parameters critical for enhancing industrial production efficiency. Using the Discrete Element Method (DEM), this study simulates wet and dry particle screening on a cylindrical vibrating screen. It evaluates particle screening efficiency, collision frequency, and particle distribution across 30 different vibration parameter combinations. The analysis identifies the optimal settings for frequency, amplitude, speed, and inclination angle under various conditions. The optimal combination was found to be an amplitude of 4 mm, frequency of 15 Hz, rotational speed of 10 rpm, and a screen inclination angle of 0°. Screening efficiency is higher when particles exhibit an arithmetic distribution on the screen. This study provides valuable insights for the efficient operation and optimal design of cylindrical vibrating screens. Read More