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螺杆泵采油在我国已广泛应用,但尚属初试,为了掌握它的性能,螺杆泵工况综合参数诊断系统应运而生,它是一种多参数测试系统,它能测试螺杆泵蝇的油压,套压、电流、电压、扭矩和转速,然后利用测量的参数对螺杆泵抽油井的工况进行综合分析判断,得到了油田技术人员好评。 相似文献
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设计了实现了一种基于MSP430F2002的数字式单相正弦波变频电源,文中对其软硬件设计、器件参数计算以及设计、测试过程进行了详细的描述.该变频电源的供电电源为36V蓄电池,由MSP430F2002完成了SPWM信号产生、电压幅度和频率调制的功能,经单相逆变电路和LC滤波电路得到电压幅度在0V到30V、频率在1Hz到70Hz之间可调、最大负载电流为1A的正弦交流输出信号,可满足过套管电阻率测井仪器的现场需求,测试结果表明使用MSP430F单片机是实现低功耗、低成本、高可靠性仪器设计的最佳选择. 相似文献
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Distribution characteristic of scattering field for an ellipsoidal target irradiated by an electromagnetic wave from an arbitrary direction
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It is of great importance for engineering applications to obtain the expression of scattering field for an ellipsoidal target irradiated by an electromagnetic wave from an arbitrary direction. Literature relevant to this problem is seldom found. In this paper, the scattering field for an ellipsoidal target is presented by utilizing the scale transformation of electromagnetic field and the rotation of coordinate system, with an electromagnetic wave projecting on the target from an arbitrary direction. The obtained result is in good agreement with the solution available from the literature if we consider the scale factors to be unity. Taking a conducting ellipsoidal target for sample, we perform the partial simulations of the ellipsoidal model and a plant leaf model by choosing different scale factors. The obtained results show that the distribution characteristic of scattering field is sensitively affected by the polarization of the incident wave and varies not much with the incident wave angle but changes with the observation point. At some points the scattering energy arrives at its maximum. 相似文献
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基于DSP和直接数字频率合成(DDS)原理,利用ADSP21992芯片作为主控模块的核心,采用AD9834型DDS器件设计了一个三维感应测井信号发生器,该信号源的研制对于三维感应线圈系结构、参数、响应原理、三维感应信号采集技术、信号合成处理方法等研究有重要意义。 相似文献