Advanced Materials Research Vols. 912-914

Abstract: MIMO (Multi-input Multi-output) is an abstract mathematical model used to describe the multi-antenna wireless communication system. the transmitter can use a plurality of separate antennas transmit signals simultaneously. This paper first analyzes MIMO physical model, and then the MIMO channel characteristics and capacity for analysis, analysis of MIMO antenna characteristics and finally focus on the correlation coefficient

Abstract: This paper discusses the faults of master clutch,broken weft parking,broken weft or warp no-parking,miss operation,inadequate parking and thick-film circuit,and corresponding solutions are put forward:Check clutch and replace the bearings timely when clutch has abnormal sound;Check the brake angle frequently;Pay special attention to the quality of the beam and the original yarn;Enforce vigorously the quality of the main parts; The adjustment of the sensor angle is very important;The most intuitive feel of broken weft or warp no-parking is the faults of sensor;Miss operation of loom dues to the circuit board fault or other faults,regulating improper self-locking,the peripheral circuit,starting circuit fault is in unable to conduction state,or stop circuit fault is in the power state;Inadequate parking shall check the setting position of micro switch.

Abstract: The common failures of three-phase motor are described, the specific reasons of failure are analyzed, the treatment of common failures are illustrated, the motor repair methods are summarized, the troubleshooting process is pointed out, the developing direction of common troubleshooting is put forward. For saving production resources, improving the efficiency of enterprise's safety production and economic benefit, it has important guiding significance.

Abstract: The design of single-stage PWM power amplifier with direction control signal is introduced. Proper grid drive circuit is designed to reduce vibration and enhance efficiency. Through the design of signal and power isolated circuit to enhance the capacity of anti-jamming and the security. This paper elaborates on technical difficulties met in the development of the PWM power amplifier and its solution.

Abstract: The multi-function keyboard display controller can complete lots of job, which contain direct keyboard, matrix keyboard, LED digital tube dynamic scanning. The controller including button identification, automatic continuous functions and LED digital tube display , flashing and controlling the decimal point. At the same time, the external interface of the controller using the routine UART interface, established a perfect communication protocol. So that we can realize the access keys and control the display of LED digital tube. The multi-function keyboard display controller not only can overcome the disadvantages that traditional microcontroller system take more of the I/O lines and system resource, but also can use the mainstream Field-Programmable Gate Array completes system functions.

Abstract: The analysis of the composition of cold extrusion die, extrusion die working part, backward extrusion die parts design, at the same time the plunger design, analyzed the packed dimension and tolerances of convex die and concave die manufacturing.

Abstract: In view of the machining difficult problem of hyperboloid, a new method is presented that high speed lapping hyperboloid parts using the bended lapping tool, and the principle of high speed lapping by the bending method is discussed. The mathematical model of bended lapping tool has been established using mechanics and higher mathematics, and the expression of width function of lapping tool is deduced. Analysis of the calculating example indicated that this method is possible to design the needed lapping tool. The bending experiment of lapping tool has confirmed the feasibility using this method, the biggest error of face shape was 1.0038μm, the face shape precision can satisfy the majority part request.

Abstract: Due to the capability of high strain, dielectric elastomers are promising for applications as transducers in cameras, robots, valves, pumps, energy harvesters and so on. This paper focuses on the large deformation analysis of a dielectric elastomer membrane.The membrane is initially flat and attached to a disk in the inner circle and to a rigid ring in the outer circle, then a weight is applied to the disk and the membrane deforms into an axisymmetric shape, undergoing large out-of-plane deformation. The membrane is assumed to behave elastically in accordance with the ogden law. The governing equations are derived by combining kinematics and thermodynamics and a set of ordinary differential equations (ODEs) are obtained finally. The ODEs are solved by using shooting method. The obtained results show that the deformation field in the membrane is very inhomogeneous.

Abstract: A typical parallel hybrid power system is briefly analyzed, and also its configuration is schematically depicted, on this basis some type of parallel hybrid power system is matched and analyzed in detail, with the foundation of vehicle transmission theory , calculation process given step by step, illustrated by a practical driving vehicle.

Abstract: Mechanical products is widely used in agriculture now, but lacks a kind of operating area measuring system. Therefore, a kind of Intelligent operating area measuring system, simple structure, convenient operation and reliable performance has been developed.