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The leg control on foot trajectory planning and contact forces is the most crucial problem for a hydraulic quadruped robot. In contrast with a non-redundant leg, the redundant one generally has larger foot workspace and more agility for leg motion control in rough terrain, however, this redundant joint obviously adds complexities and difficulties to the control system. This work aims to avoid those...
Two maximum-torque-per-ampere (MTPA) algorithms for an interior permanent magnet synchronous motor (IPMSM) drive are presented in this paper. The proposed MTPA algorithms include an improved virtual signal injection control (VSIC) and a direct-search control. Compared to the original VSIC, the improved VSIC can be more accurate. Additionally, the comparison of two MTPA algorithms is given, including...
An add-drop filter with asymmetric coupling to bus waveguides, cascaded with a notch filter, enables non-reciprocal data transmission through direction dependent resonance shift. Strong dispersion and attenuation near resonance allows one-way 10 Gbps data transmission.
We present a supermode fiber to support orbital angular momentum (OAM) multiplexing. The designed supermode fiber can guide multiple OAM modes with favorable performance of low mode coupling, low nonlinearity, and low modal dependent loss.
We investigate enhanced coupling of the pump laser as a result of power transfer to the frequency comb in a silicon nitride microring designed with an over-coupled bus-waveguide.
Wireless sensor networks have been widely studied and find applications in military as well as civil contexts. Due to limited lifetime of sensor batteries, varied approaches to extend the lifetime are intensively investigated. Recently, wireless energy charging technologies, especially the magnetic resonant coupling, have been resorted to offer sufficient energy supply for individual sensors. Seeking...
We present an ultra-compact optical diode using nonlinear second-order silicon microring resonator which is complementary metal-oxide semiconductor (CMOS) compatible. The designed optical diode features high isolation (>20 dB) and more tolerant resonance wavelength mismatch (+/−0.35 nm with <1.5 dB isolation degradation).
We investigate a nonlinear coupling effect which results from frequency comb-induced pump saturation in a silicon nitride microring cavity fabricated with both through-and drop-ports.
A polarization beam splitter with cascaded asymmetrical directional couplers is demonstrated experimentally on a silicon-on-insulator (SOI) platform. The measured extinction ratios of the fabricated PBS are about 11dB and 13dB for TE/TM polarizations.
We propose a novel fiber converting input circular polarized light to orbital angular momentum (OAM) modes. We show the generation of up to 8 OAM modes with 30-dB extinction ratio and mode purity of >96.4% using <10-mm-long fiber.
We propose a fiber coupler to generate up to ten orbital angular momentum modes, which can be generated with 20-dB extinction ratio and mode purity of >99% using a 2-mm-long fiber. The fiber design can be extended to enable all-fiber spatial mode (de)multiplexing.
There is an urgent demand for nano level tele-operating system to carry out three-dimensional high-speed micro manipulations for medical and biotechnological applications. In this paper, we designed a parallel micromechanism driven by piezo actuators (PZT) as the operating robot with 6 DOF. Also, we presented the simulation for the parallel micro-mechanism. The experimental results indicate that the...
A vehicle-mounted forward-looking ground penetrate synthetic aperture radar (VMFL-GPSAR) is newly developed in China for real-time mine detection. The VMFL-GPSAR is an impulse radar system. With a 6 meter long antenna array, the radar can output 0.15 m by 0.15 m real-time images at a velocity of 15 Km/h. This paper presents some key techniques in developing the system, including antenna dispersion...
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