Influence of Motorcycle Noise on Gear Transmission
The study of motorcycle's acoustic signal shows that gears noise take a great proportion on the whole acoustic of motorcycle.So how to control the noiseof gears is very helpful for reducing the whole motor's acoustic.This paper discusses the engine matching with transmission system in reason,primary transmission and gear geometry design parameter the mend of tooth body(tooth form tooth direction) how to influence the acoustic of motorcycle.The study shows that the gear transmission System's matching with engine in reason can notable improve the efficiency of motorcycle.In the meaning time the exactly choosing the primary transmission gear geometry design parameter and the mend of primary transmission gear's tooth body can effectively reduce the acoustic of motorcycle.This paper has engineering practice sense.
This paper describes a measurement technique suitable for characterizing nonlinear microwave devices operating under multi-frequency excitation. A dual six-port network analyzer configured for simultaneous load-pull and source-pull measurement allows the characterization of nonlinear devices under multi-tone excitation, for use as mixers and broadband power amplifiers. The performance of a particular circuit can be optimize as a function of source and load impedances, at each input and output signal frequencies. Measurement results for the MESFET NE 76184, resistive mixer (2.9 to 7.1 GHz) show that a higher performance can be obtained by choosing independently the appropriate termination for input and output frequencies. The experimental results are also useful for the device modelling purposes. >