摘要：This paper presents a novel design method of force rebalance control for the sense mode of micromachined vibratory *** theoretical deductions are performed to identify a precise linear model of the open loop system of the sense mode,which is crucial for the PI controller *** frequency responses obtained by experimental tests agree well with those calculated with the theoretical model,indicating the accuracy of the theoretical *** results demonstrate that the bandwidth of the closed loop is extended to 94.8 Hz from 2.3 Hz in the open loop and the quadrature signal is suppressed by about 64 dBV in the closed loop *** overshoot and stable time in the step response of the closed loop system are measured to be about 15% and 35 ms,*** mode-splitting gyroscope with the closed loop controlled sense mode achieves a scale factor of 41.0 mV/deg/s with nonlinearity of 0.09% and asymmetry of 1%,and a bias instability of 4.0 °/h with angle random walk of 0.171 deg/h1/2.

摘要：This paper proposes a novel robust design method for the sense mode of a MEMS vibratory gyroscope based on fuzzy reliability and Taguchi design. The principles of fuzzy reliability and Taguchi design are both introduced and described in detail. Experimental results demonstrate that the signal to noise ratio of the robust design scheme is better than those of the other experimental *** the full temperature range from -40 to 80°C, the temperature sensitivities of phase margin, gain margin, sensitivity margin,the maximum amplitude of open loop system, bandwidth of closed loop system, and the performance function of the robust design system are all smaller than those of the original design system. Meanwhile, the temperature sensitivity of the bandwidth of the robust design system is improved to 126 from 1075 ppm/°C. Moreover, the bias drift over the full temperature range of the robust design system is improved to 61°/h from 179°/h.

摘要：儿童骑共享单车发生伤亡的,共享单车企业不存在合同责任,是否承担侵权责任,取决于其是否承担安全保障义务。民法典侵权责任编第1198条限定了责任主体范围,导致学界对此条款是否构成安全保障义务的一般条款存在争议。在对第1198条定性未达一致的情况下,儿童骑共享单车发生伤亡的,可以通过法律解释,将共享单车企业纳入此条“经营者”的范围。具体是否应当承担责任,应根据儿童开锁情形进行判断。儿童使用工具强行开锁或者父母开锁后交儿童骑行发生伤亡的,共享单车企业不承担责任。因单车锁具设计有缺陷、车锁损坏未及时维修、前人骑后未关锁等原因使得儿童轻易开锁骑行发生伤亡的,应当认定共享单车企业违反安全保障义务,其不作为与儿童伤亡结果具有因果关系,且对损害结果能够预见而未为避免,存在过错,由其依据民法典第1198条第1款承担损害赔偿责任,但因儿童一方有过失得减轻责任。在存在第三人侵权(交通事故)的情况下,第三人的介入不中断共享单车企业的不作为与儿童损害之间的因果关系,共享单车企业应当在未尽到安全保障义务的范围内承担相应的赔偿责任。

摘要：液态燃料钍基熔盐实验堆滞留盘管是熔盐堆尾气处理系统的重要核安全级设备,为尾气中短寿命核素衰变提供封闭环境,同时去除衰变热,降低其后碘吸附床和活性炭吸附床的温度。本文介绍了业主提供的2 MWt液态燃料钍基熔盐实验堆滞留盘管原设计方案中存在的问题及结构优化后的新设计方案。优化后的滞留盘管设计方案具有散热性好、泄漏点少(焊缝少)、容易施焊、便于检测监控维修、用材少等优点,具有较好的可靠性和经济性。

摘要：根据速度350 km/h双层动车组动车的平断面特点,分析了其对噪声传播和控制的影响,提出下层客室地板、牵引变流器间为降噪设计重点区域,同时上层地板需开展撞击声隔声优化设计,以避免上层人员走动对下层乘客舒适性的影响。针对这些降噪需求,从车体型材声学断面优化、阻尼结构、变流器间吸隔声设计、上层地板减振等方面进行了降噪设计和整车噪声仿真,实现了预期控制目标。

摘要：高加速极限试验可快速暴露MEMS陀螺的缺陷和薄弱环节,针对复合环境应力试验的陀螺失效品,开展了详细的失效定位和机理分析,推导了引线的振动响应特性和固有模态,并提出了引线的抗振设计方法。仿真和实验结果表明,引线固有频率的理论推导模型比较精确,通过缩短引线长度可有效提高引线的固有频率和降低振动应力,从而增强其抗振能力。优化设计后陀螺可耐受频率为0~10 kHz、总均方根为30 gn的加速度随机振动。

摘要：以拥有燃氢汽车家庭的光伏-氢燃料电池热电联产系统为研究对象,基于TRNSY软件建立系统动态仿真模型,以海口地区三口之家的电力、热水、氢需求为例,通过分析系统不同组件配置运行的可靠性及经济性对系统配置方案进行优化设计。基于该系统方案,分析系统典型周以及典型年运行特性。结果表明:光伏组件数量从90块增至150块,系统供电、供氢可靠性分别可提升2.33%、26.93%,用电成本最低为0.74元/kWh,但能源利用率下降34.13%;配置105块光伏组件和8个储氢罐时,可满足电力和热水需求,供应氢气需求的86.42%,用电成本为0.77元/kWh,能源利用率为95.75%;系统在冬季由于辐照度低导致约20.24%的氢气无法被供应;氢燃料电池夏季供热占比高于80%,其全年供电、供热占比分别为19.82%和57.65%。

摘要：为了深入掌握微机械陀螺的冲击响应特性,本文进行了详细的理论推导和MATLAB仿真分析,并进行了测试验证。冲击试验结果表明,理论分析和试验结果基本一致,考虑最坏情况可知,当脉宽对应的冲击频率与陀螺固有频率越接近,并且陀螺品质因子和冲击加速度幅值越大时,则冲击带来的影响就越大,梁越容易发生断裂失效。因此要使MEMS陀螺具有较强的抗冲击能力,必须综合优化设计陀螺的真空度和固有频率。

摘要：This paper experimentally studies the effects of the conductivity of a silicon wafer and the gap height between silicon structures and glass substrate on the footing effect for silicon on glass （SOG） structures in the deep reactive ion etching （DRIE） process. Experiments with gap heights of 5,20, and 50μm were carried out for performance comparison of the footing effect. Also,two kinds of silicon wafers with resistivity of 2-4 and 0.01-0. 0312Ω· cm were used for the exploration. The results show that structures with resistivity of 0.01 - 0. 0312Ω· cm have better topography than those with resistivity of 2-4Ω· cm; and structures with 50μm-high gaps between silicon structures and glass substrate suffer some- what less of a footing effect than those with 20μm-high gaps,and much less than those with Stem-high gaps. Our theoretical analysis indicates that either the higher conductivity of the silicon wafer or a larger gap height between silicon structures and glass substrate can suppress footing effects. The results can contribute to the choice of silicon type and optimum design for many microsensors.

摘要：A new silicon beam resonator design for a novel gas sensor based on simultaneous conductivity and mass change measurement is investigated. High selectivity and sensitivity in gas detection can be obtained by measuring the charge-to-mass ratio of gas molecules. Structures of silicon beam resonators are designed, simulated, and optimized. This gas sensor is fabricated using sacrificial layer microelectronmechanical system technology, and the resonant frequency of the microbeam is measured.