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介绍了NAL200系列水准仪的特点、水准仪工作原理以及补偿器检验和校正的方法,并详细给出了水准仪基本指标的校正方法,如圆水泡的调整、i角误差的校正、补偿精度的校正、补偿器交叉误差的校正等,为用户在进行测量过程中保证仪器的精度提供参考。 相似文献
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An adaptive output feedback controller based on neural network feedback-feedforward compensator (NNFFC) which drives a surface ship at high speed to track a desired trajectory is designed. The tracking problem of the surface ship at low speed has been widely investigated. However, the coupling interactions among the forces from each degree of freedom (DOF) have not been considered in general. Furthermore, the influence of the hydrodynamic damping is also simplified into a linear form or neglected. On the contrary, coupling interactions and the nonlinear characteristics of the hydrodynamic damping can never be neglected in high speed maneuvering situation. For these reasons, the influence of the nonlinear hydrodynamic damping on the tracking precision is considered in this paper. Since the hydrodynamic coefficients of the surface ship at high speed are very difficult to be accurately estimated as a prior, it will be compensated by NNFFC as an unknown part of the tracking dynamics system. The stability analysis will be given by the Lyapunov theory. It indicates that the proposed control scheme can guarantee that all the signals in the closed-loop system are uniformly ultimately bounded (UUB), and numerical simulations can illustrate the excellent tracking performance of the surface ship at high speed under the proposed control scheme. 相似文献
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胡伟标 《CT理论与应用研究》1996,5(1):32-34
本文叙述了ＣＴＸ线质量控制，对控制部件光束限位器、准值器、以及射线校正器等工作原理进行了系统的分析，并对各故障部件的控制进行改进讨论。 相似文献
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介绍了DSZ2型水准仪补偿器检验和校正的方法,为用户在进行测量过程中保证仪器的精度提供参考。 相似文献
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分析了精密补偿器水准仪磁致误差的成因，介绍了研制的一套磁致误差检测设备以及完整的检测方法。通过大量的检测数据与数理统计，表明４测回的标准差为０．００８″。该设备已为全国一等水准网复测，地震形变测量和精密工程测量等检测磁致误差１００多台次。 相似文献
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In the present paper, the application of the sliding mode control (SMC) scheme is discussed in a systematic manner for controlling the vibration of tall buildings with an Active Tuned Mass Damper (ATMD) installed at the top floor. It is shown that the application of the SMC theory for buildings with ATMD may lead to large responses in the building due to the interaction effect from the ATMD caused by the comparatively large response of the ATMD. Based on the theory of compensators, a method is proposed which eliminates the interaction effect from the ATMD to the building and thus prevents large response in the building. The results are demonstrated through simple numerical examples of building–ATMD system subjected to initial condition loading as well as two different types of external excitations. © 1997 by John Wiley & Sons, Ltd. 相似文献
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介绍了苏一光RTS600系列全站仪指标校正和常见故障判断及维修方法,为用户在仪器出现问题时能够正确地进行故障处理提供参考。 相似文献
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CHC Trailing suction hopper dredgers (TSHD) have been widely used in dredging industry. In order to simulate the dredging
process accurately, a mathematical model for a swell compensator used in TSHD is proposed, and a friendly simulation model
based on the Automated Dynamic Analysis of Mechanical Systems (ADAMS) is built to test and validate the mathematical model
for the swell compensator. The factors influencing the dynamic behavior of the TSHD suction pipe system, such as the motion
of the vessel in an unquiet situation with different water current velocities, seabed profiles, seabed soil hardness and the
forces acting on the suction pipe system, have been taken into consideration. The simulation results show that they fit in
with the operating practice qualitatively. 相似文献
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In this paper, a novel model reference adaptive controller with anti-windup compensator (MRAC_AW) is proposed for an autonomous underwater vehicle (AUV). Input saturations and parametric uncertainties are among the practical problems in the control of autonomous vehicles. Hence, utilizing a proper adaptive controller with the ability to handle actuator saturations is of a particular value. The proposed technique of this paper incorporates the well-posed model reference adaptive control with integral state feedback and a modern anti-windup scheme to present an appropriate performance in practical conditions of an AUV. Stability of the proposed method is analyzed by Lyapunov theory. Then, the proposed controller is implemented in the hardware in the loop simulation of AUV. For this purpose, the introduced method is implemented in an onboard computer to be checked in a real-time dynamic simulation environment. Obtained results in the presence of real hardware of system, actuators, computational delays and real-time execution verify the effectiveness of proposed scheme. 相似文献