本文对428XL仪器如何实现震源源驱动的设置进行了详细阐述。针对地震采集生产过程中遇到的GPS漂移导致点位不准、仪器源数字辅助发生器箱体DPG(Digital Pilot Generator)无法启动震源数字伺服驱动箱体DSD(Digital Servo Drive)以及地震...本文对428XL仪器如何实现震源源驱动的设置进行了详细阐述。针对地震采集生产过程中遇到的GPS漂移导致点位不准、仪器源数字辅助发生器箱体DPG(Digital Pilot Generator)无法启动震源数字伺服驱动箱体DSD(Digital Servo Drive)以及地震记录系统NAS4000记录速度慢等故障进行了深入地分析并列举出解决办法,以便提高野外地震采集工作效率。展开更多
为了实现绝对光栅尺的快速解码,提高绝对光栅解码的实时性,建立了片上Nios绝对光栅编解码系统。首先,使用Verilog hdl语言编写了光栅编码采集的前端CCD和AD驱动。接着,将转换后的数据送到后端,以EP2C5T144C8为核心处理器的FPGA上的硬件...为了实现绝对光栅尺的快速解码,提高绝对光栅解码的实时性,建立了片上Nios绝对光栅编解码系统。首先,使用Verilog hdl语言编写了光栅编码采集的前端CCD和AD驱动。接着,将转换后的数据送到后端,以EP2C5T144C8为核心处理器的FPGA上的硬件加速模块,获得光栅条纹编码信息。然后,利用sopc技术,在实现Avalon数据接口ip核的基础上,搭建绝对光栅编码采集和处理平台,最后,在NIOS II IDE软件开发环境中,编写生成伪随机码绝对位置查询数据库和解码程序。实验结果表明:此编解码系统,在解码速度为2000帧/s条件下,精度为7μm,基本解决面阵做采集帧速不够的问题,并有较好的实时性,有效地降低了开发成本,为绝对光栅的开发提供了一个新的途径。展开更多
To make sure that the nodule collector can walk on the soft sediments of seafloor effectively, suspension principle of deep-ocean nodule collector is proposed. The supporting and driving mechanisms are separated to av...To make sure that the nodule collector can walk on the soft sediments of seafloor effectively, suspension principle of deep-ocean nodule collector is proposed. The supporting and driving mechanisms are separated to avoid collector sinking. The supporting mechanism is a streamlined body with large and smooth supporting area. The grounding pressure is reduced to 0.5- 1 N/cm2 to make sure that the sinkage is limited. The impellers serve as the driving mechanism to supply enough driving power. The position between the supporting mechanism and the driving mechanism can be adjusted according to the operating condition to decrease the walking resistance and to increase driving efficiency. The test results indicate that the collector can walk on the surface of the soft sediments with the limited sinkage. The traction forces were up to 800 kg and the sinkage of the impeller was under the limitation.展开更多
This paper describes design and calibration procedures of a new small-scale testing apparatus for evaluating soil-structure interaction. Two distinct modes of loadings, such as, direct shear and pullout loadings on fl...This paper describes design and calibration procedures of a new small-scale testing apparatus for evaluating soil-structure interaction. Two distinct modes of loadings, such as, direct shear and pullout loadings on flexible and rigid reinforcements are implemented by the multiple functionalities of the apparatus through the use of single loading frame, dividing mechanism, instrumentation and data acquisition systems. The design is similar to the conventional apparatus; however, it includes some key modifications to adapt additional features of reinforcements. For the pullout test, the top half of the pullout box is fixed with the bottom half of the pullout box, while for the direct shear test, the top half is allowed to slide horizontally on low friction roller bearings connected to the driving mechanism. Mechanical loadings through a steel plate are used to apply the normal load in the pullout and direct shear apparatus. A series of shear and pullout tests are performed to validate the functionality of the apparatus and to examine relationships between the reinforcements and its shear and pullout resistances.展开更多
文摘本文对428XL仪器如何实现震源源驱动的设置进行了详细阐述。针对地震采集生产过程中遇到的GPS漂移导致点位不准、仪器源数字辅助发生器箱体DPG(Digital Pilot Generator)无法启动震源数字伺服驱动箱体DSD(Digital Servo Drive)以及地震记录系统NAS4000记录速度慢等故障进行了深入地分析并列举出解决办法,以便提高野外地震采集工作效率。
文摘为了实现绝对光栅尺的快速解码,提高绝对光栅解码的实时性,建立了片上Nios绝对光栅编解码系统。首先,使用Verilog hdl语言编写了光栅编码采集的前端CCD和AD驱动。接着,将转换后的数据送到后端,以EP2C5T144C8为核心处理器的FPGA上的硬件加速模块,获得光栅条纹编码信息。然后,利用sopc技术,在实现Avalon数据接口ip核的基础上,搭建绝对光栅编码采集和处理平台,最后,在NIOS II IDE软件开发环境中,编写生成伪随机码绝对位置查询数据库和解码程序。实验结果表明:此编解码系统,在解码速度为2000帧/s条件下,精度为7μm,基本解决面阵做采集帧速不够的问题,并有较好的实时性,有效地降低了开发成本,为绝对光栅的开发提供了一个新的途径。
基金Project(2012AA091201) supported by the National High Technology Research and Development Program of China
文摘To make sure that the nodule collector can walk on the soft sediments of seafloor effectively, suspension principle of deep-ocean nodule collector is proposed. The supporting and driving mechanisms are separated to avoid collector sinking. The supporting mechanism is a streamlined body with large and smooth supporting area. The grounding pressure is reduced to 0.5- 1 N/cm2 to make sure that the sinkage is limited. The impellers serve as the driving mechanism to supply enough driving power. The position between the supporting mechanism and the driving mechanism can be adjusted according to the operating condition to decrease the walking resistance and to increase driving efficiency. The test results indicate that the collector can walk on the surface of the soft sediments with the limited sinkage. The traction forces were up to 800 kg and the sinkage of the impeller was under the limitation.
文摘This paper describes design and calibration procedures of a new small-scale testing apparatus for evaluating soil-structure interaction. Two distinct modes of loadings, such as, direct shear and pullout loadings on flexible and rigid reinforcements are implemented by the multiple functionalities of the apparatus through the use of single loading frame, dividing mechanism, instrumentation and data acquisition systems. The design is similar to the conventional apparatus; however, it includes some key modifications to adapt additional features of reinforcements. For the pullout test, the top half of the pullout box is fixed with the bottom half of the pullout box, while for the direct shear test, the top half is allowed to slide horizontally on low friction roller bearings connected to the driving mechanism. Mechanical loadings through a steel plate are used to apply the normal load in the pullout and direct shear apparatus. A series of shear and pullout tests are performed to validate the functionality of the apparatus and to examine relationships between the reinforcements and its shear and pullout resistances.
