Papers by Keyword: Gyroscope

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Authors: Qiang Fu, Wei Ping Chen, Ying Kai Zhao, Liang Yin, Xiao Wei Liu
Abstract: In this paper, a 4th-order sigma-delta modulator applied in gyroscope is presented. This modulator adopts the 2-1-1 Multi stage noise shaping structure. The bandwidth of signal is 100 KHz, the over sample rate is 64, and sample frequency is 12.8MHz. By the MATLAB Simulink modeling and simulation, when the input signal is 100 KHz, the SNDR of the MASH ADC is 121.8dB, and the effective number of bit is 19.93 in ideal situation. After considering non-ideal factors, the SNDR is 111.6dB, the effective number of bit of ADC is 18.28. Compared with the ideal situation, the noise floor of PSD has increased 40dB. It explains that non-ideal factors have a significant effect on the performance of the sigma-delta ADC. The 4th-order MASH sigma-delta modulator has been implemented under 0.5 um CMOS process and simulated under Cadence. The final simulation results show that SNDR is 112.4 dB and effective number of bits (ENOB) is 18.6.
1077
Authors: Daniel Gapiński, Konrad Stefański
Abstract: The dissertation presents the method of controlling the designed scanning and tracking head (optical target seeker) [ which is used for detecting and tracking air targets emitting their own radiation, e.g. infrared radiation. The control algorithm consists in using the phase trajectories of control deviations. Digital simulations of the proposed solution have been conducted. The results of those simulations have been presented in a graphical form.
145
Authors: Bastian Scheurich, Michael Gentner, Michael Frey, Frank Gauterin
Abstract: A new approach substitutes the damper of a passenger car by a cardanic gimbaled flywheel mass. The constructive design leads to a rotary damper in which the vertical movement of the wheel carrier leads to revolution of the rotational axis of the flywheel. In this arrangement, the occurring precession moments are used to control damping moments and to store vibration energy. Different damper characteristics are achieved by different velocities of the inner ring. From almost zero torque output to high torque output, this damper has a huge spread. In this paper a control concept for a LQR is presented. The objective of the control is an adequate motion of the gyroscope to a desired damping characteristic of a passenger car.
178
Authors: Xian Wei Wang, Jun Hai Jiang
Abstract: In this paper a low-cost Micro-Electro-Mechanical System (MEMS) inertial measurement unit is designed, a 3-axis accelerometer and 3-axis gyroscope simulated 6 degrees of freedom orientation sensing through sensor fusion. By analyzing a simple complimentary filter and a more complex Kalman filter, the outputs of each sensor were combined and took advantage of the benefits of both sensors to improved results. The experimental results demonstrate that the output signal can be corrected suitability by means of the proposed method.
42
Authors: Kean Lee Kang, Jin Xie, Ming Lin Julius Tsai
Abstract: This paper presents a new design of vibratory four degree-of-freedom (DOF) gyroscope, which is inherently robust to keep stable sensitivity under changes of environmental temperature and pressure. The frequency response of the gyroscope has two resonant peaks close to each other, and the operating range is in the flat region between the two peaks. Simulation results show that the sensing amplitude increases by only 1.6% when the temperature rises from 25°C to 75 °C, and drops by only 6% when the pressure increases from 0.1 to 1 Torr.
199
Authors: Tong Yue Gao, Chun Tao Shen, Zhen Bang Gong, Jin Jun Rao, Jun Luo
Abstract: For some disabled people can’t use hand to control the mouse, this paper designs a novel head-controlled mouse. Using accelerometers and gyroscopes as the sensitive element of the system measure the head rotation angle. The mouse is controlled as for the relationship between the head rotation angle and the mouse move distance. For mouse click operation, this article designed a software to achieve. Considering the MEMS sensor noise affect the mouse control accuracy, using the unscented Kalman filter (UKF) to fusion the data of accelerometers and gyroscopes to obtain the optimal angle estimation. Compared with only using an accelerometer or gyroscope sensor, the method proposed in this paper for angle measurement can have high accuracy and stability, thereby improving the mouse control precision and maneuverability.
95
Authors: Hai Lin Tang, Xian Xue Liu, Hao Zhou
Abstract: A z-axis decoupled micromachined gyroscope with dual frames is designed, fabricated and tested. The robust structure considering fabrication errors is obtained by the use of optimal robustness of design and process compensation. The gyroscope is packaged in vacuum, and test results show that quality factor of driving and sensing modes are 2000 and 800, respectively. In the range of 0~2400 deg/sec, sensitivity and linearity of the fabricated gyroscope are 1 deg/sec and 0.3%, respectively.
169
Authors: Jan Šklíba, Jan Škoda
Abstract: The fundamental condition of the sufficient vibration-isolation is that all natural frequencies of a system are placed outside the interval of exciting frequencies. By the application of a gyroscopic stabilizer depend some natural frequencies on the gyroscope impulse moment. There is described how to reach the fundamental condition by the help of sufficient magnitude of gyroscopes impulse moment.
116
Authors: Li Jun Song, Zhong Xing Duan, Deng Feng Chen, Sheng Jun Xu, Ji Wu Sun
Abstract: ADS8364 is a sixteen-bit parallel output that is sampling and conversion at the same time by six channels. It is a kind of high-precision chip sampling in power. ADS8364 is introduced which combined with practical application of DSP on the attitude and heading reference. ADS8364 which can carry out data collection of six channels is used in the attitude and heading reference for data collection of MEMS sensor of inertial. The data are transmitting to DSP which could complete processing of data and estimate of attitude. By analyzing the results of examination, the precision of MEMS gyroscope’s data which are collected by ADS8364 synchronously could satisfy the request of the attitude and heading reference.
2789
Authors: Yu Liu, Xue Cheng Xu, Qiong Liu, Ting Hong Ji
Abstract: MEMS inertial sensors using underground azimuth measurement, with small size, high accuracy, low cost and good stability, the control and drive system is very important. This paper presents the autonomous underground azimuth measurement drive system based on MEMS gyroscope. Using MEMS gyroscope as a measuring element, driven by a brushless DC motor, using a combination of photoelectric encoder, according to the underground azimuth measurement principle, this paper proposed a autonomous measurement method, discussing the design principles of the program, the components of the system, and the communication problems between the gyroscope and other part. Overcoming the high cost of traditional logging tool and the complex control problem, experimental results verify that the system is able to achieve underground azimuth measurement purposes. Error in 1.5°or less, with outstanding engineering applications.
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