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2D閥控電液激振器低頻段振動(dòng)波形分析
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Low Frequency Excited Waveforms Analysis of an Electro-hydraulic Vibration Exciter Using a 2D Valve
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    摘要:

    2D閥控電液激振器是利用2D閥閥芯的勻速旋轉(zhuǎn)和軸向滑動(dòng)改變閥口面積變化波形，以產(chǎn)生頻率和幅值可獨(dú)立調(diào)節(jié)的振動(dòng)波形。在分析該激振器工作原理的基礎(chǔ)上，建立數(shù)學(xué)模型，采用分段積分的方法，推導(dǎo)出激振器輸出波形方程的解析解，最后，將實(shí)驗(yàn)得到的波形與解析波形進(jìn)行對比，根據(jù)頻譜特性分析波形的失真度。研究結(jié)果表明：在低頻段，由于主要受到彈性負(fù)載力方向變化的影響，振動(dòng)波形表現(xiàn)出上升與下降過程的不對稱，其不對稱度取決于2D閥的軸向開口大小，實(shí)驗(yàn)與解析結(jié)果一致。雖然隨著頻率的提高要考慮液壓諧振的影響，但只要閥的軸向開口小于某一臨界值，其波形失真度就不大于

    Abstract:

    9.5%。For an electro-hydraulic vibration exciter with a 2D valve, the frequency and the amplitude of the excited waveforms are separately controlled by rotary motion and sliding motion of valve core, respectively. Based on the work principle of the an electro-hydraulic vibration system, the mathematical model of an exciter was established. The equations of excited waveforms were solved by using the subsection integration method, and the real excited waveforms were obtained to validate the theoretical analysis result. The corresponding spectrum analysis and the distortion calculation were executed. The results reveal that in low frequency section, the ascent and descent slopes of excited waves demonstrated somewhat asymmetrical because of the changing direction of the elastic load. The extent of asymmetry depends on the axial opening of 2D valve. The waveform distortion is not greater than 9.5% as long as the linear opening of 2D valve is below a critical point. 

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任燕,阮健,賈文昂.2D閥控電液激振器低頻段振動(dòng)波形分析[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2010,41(9):187-193.Low Frequency Excited Waveforms Analysis of an Electro-hydraulic Vibration Exciter Using a 2D Valve[J]. Transactions of the Chinese Society for Agricultural Machinery,2010,41(9):187-193.

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