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RISS 인기검색어
- 검색키워드
- 저자 : Ruijun Zhang (검색결과 13 건)
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Response analysis of non-linear compound random vibration of a high-speed elevator
Ruijun Zhang,Chen Wang,Qing Zhang,Jie Liu 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.1
This study presents a non-linear constitutive equation for the rolling guide-shoes associated with a high-speed elevator system. This was done to accurately evaluate the dynamic behavior of a high-speed elevator car and analyze the action mechanism of random factors during manufacturing and installation on the dispersion of vibration acceleration. Through the combination of the Hertz contact theory and the Bouc-Wen hysteretic model, the non-linear vibration model of the elevator car system was founded. This model was equivalent to a linear system by least squares technique, and then the random parameters and the random excitation were converted by random perturbation method and pseudo excitation method. The acceleration response sensitivities of each random parameters, the means and standard deviations of transverse vibration acceleration responses at the observation point were obtained. In the case, the transverse vibration acceleration responses of the car system were calculated. The elevator car’s vibration instance was analyzed under the different degrees of variation of the random parameters and the random excitation. The results showed that the randomness of geometric parameters has the greatest influence on transverse acceleration. The variability of parameters affects the dispersion degree of the transverse vibration responses while the variability of the excitation mainly affects the amplitude of the vibration response. This study provides an effective method for the analysis of non-linear compound random vibration responses of high-speed elevator car system, and provides a reference for the vibration control design and safety assessment.
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Ruijun Zhang,Tian Qiu,Chen Chen 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.2
An electric-liquid active guide shoe is designed to aim at the problem of car horizontal vibration caused by guide unevenness excitation. Considering the imprecision of system dynamic modeling caused by the change of load during high-speed elevator operation and the nonlinear factors of active guide shoe, the Takagi-Sugeno (T-S) fuzzy reasoning method is adopted to approximate the nonlinear car system model. Further, taking the car acceleration, displacement and actuator saturation as the controlled performance indexes, an adaptive gain H∞ output feedback control strategy is proposed based on the parallel distributed compensation rule (PDC) to attenuate the horizontal vibration of the car system. To illustrate the effectiveness of the controller and its robustness to load changes, the acceleration timefrequency response of 4 m/s high-speed elevator car system under light load and heavy load was analyzed, and compared with the numerical results under H2/H∞ robust control, It is further verified that the proposed H∞ output feedback controller with adaptive gain can effectively suppress the horizontal vibration of the high-speed elevator car system.
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Liansheng Zhang,Shuang Hao,Pengcheng Zhang,Qiangxian Huang,Rongjun Cheng,Ruijun Li,Ping Wang 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.12
Piezoelectric actuators have been widely applied to precision positioning platforms. However, the positioning accuracy of piezoelectric ceramic has been significantly affected by its characteristics of hysteresis. Owing to the voltage-keeping feature of capacitive load for piezoelectric ceramic, this paper has proposed a switch-based driving in sequence method, which alternately drives each layer of PZT by using switches. Based on the driving in sequence method, the proposed method is capable of reducing the hysteresis to 1/N of the hysteresis under traditional voltage driving method, while significantly lowering the scale and cost of hardware, compared with the previous driving in sequence method. Thus, it allows for application to hundreds of layers of piezoelectric ceramic. According to experiment results, the hysteresis under different frequencies from 0.1 to 500 Hz for homemade seven-layer piezoelectric ceramic can be reduced from 12.5 to 2.1%. Furtherly, the residual hysteresis can be corrected by applying a simple quadratic-polynomial feedforward control, and the hysteresis is constrained within 0.8%, even with feedforward parameters that are not strictly calibrated. The dual-amplifier driving in sequence method proposed in this paper can significantly reduce the hysteresis in open-loop control of piezoelectric stack actuators, effectively improving the positioning and driving performance and saving cost.
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SNP Discovery from Transcriptome of Cashmere Goat Skin
Wang, Lele,Zhang, Yanjun,Zhao, Meng,Wang, Ruijun,Su, Rui,Li, Jinquan Asian Australasian Association of Animal Productio 2015 Animal Bioscience Vol.28 No.9
The goat Capra hircus is one of several economically important livestock in China. Advances in molecular genetics have led to the identification of several single nucleotide variation markers associated with genes affecting economic traits. Validation of single nucleotide variations in a whole-transcriptome sequencing is critical for understanding the information of molecular genetics. In this paper, we aim to develop a large amount of convinced single nucleotide polymorphisms (SNPs) for Cashmere goat through transcriptome sequencing. In this study, the transcriptomes of Cashmere goat skin at four stages were measured using RNA-sequencing and 90% to 92% unique-mapped-reads were obtained from total-mapped-reads. A total of 56,231 putative SNPs distributed among 10,057 genes were identified. The average minor allele frequency of total SNPs was 18%. GO and KEGG pathway analysis were conducted to analyze the genes containing SNPs. Our follow up biological validation revealed that 64% of SNPs were true SNPs. Our results show that RNA-sequencing is a fast and efficient method for identification of a large number of SNPs. This work provides significant genetic resources for further research on Cashmere goats, especially for the high density linkage map construction and genome-wide association studies.
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Yu Gu,Ruijun Zhang,Wenyu Wu,Bin Guo,Ping Wang,Huaxin Ma 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.11
O-doping has proved to be one of the most promising approaches to further enhance the supercapacitive performance of carbon materials. However, it is presently not clear how the type of doped-O species affects the capacitive performance. In this paper, an attempt has been made to probe into the possible correlation between the type of doped-O species and the corresponding capacitive performance. Three O species (C=O, C–O and O–C=O) have been introduced onto TiC-derived carbon (TiC–CDC) by using a facile room-temperature oxidation strategy with three typical oxidizing agents (H2O2, HNO3 and (NH4)-2S2O8), respectively. The results have shown that as the content of the C=O species increases, both the specific capacitance and the capacitance retention for the oxidized TiC–CDC samples become higher, showing a positively correlative performance. This work suggests that optimizing the type of doped-O species will be great potential for obtaining the optimal electrochemical performances for the O-doped carbon materials.
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SNP Discovery from Transcriptome of Cashmere Goat Skin
Lele Wang,Yanjun Zhang,Meng Zhao,Ruijun Wang,Rui Su,Jinquan Li 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.9
The goat Capra hircus is one of several economically important livestock in China. Advances in molecular genetics have led to the identification of several single nucleotide variation markers associated with genes affecting economic traits. Validation of single nucleotide variations in a whole-transcriptome sequencing is critical for understanding the information of molecular genetics. In this paper, we aim to develop a large amount of convinced single nucleotide polymorphisms (SNPs) for Cashmere goat through transcriptome sequencing. In this study, the transcriptomes of Cashmere goat skin at four stages were measured using RNA-sequencing and 90% to 92% unique-mapped-reads were obtained from total-mapped-reads. A total of 56,231 putative SNPs distributed among 10,057 genes were identified. The average minor allele frequency of total SNPs was 18%. GO and KEGG pathway analysis were conducted to analyze the genes containing SNPs. Our follow up biological validation revealed that 64% of SNPs were true SNPs. Our results show that RNA-sequencing is a fast and efficient method for identification of a large number of SNPs. This work provides significant genetic resources for further research on Cashmere goats, especially for the high density linkage map construction and genome-wide association studies.
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Dong, Shikui,Long, Ruijun,Zhang, Degang,Hu, Zizhi,Pu, Xiaopeng Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.1
Wheat straw was treated with microwave for 4 min and 8 min at a power of 750 W and frequency of 2,450 MHz. Chemical compositions of untreated, 4 min treated and 8 min treated straws were analyzed and in sacco degradabilities of all these straws in yak rumens were measured. Microwave treatment didn't significantly (p>0.05) affect the chemical composition of the straw. In sacco dry matter (DM) degradability of the straw after 18 h incubation in rumen was significantly (p<0.01) improved by microwave treatment. In sacco crude protein (CP) degradability of the straw was not (p>0.05) affected by microwave treatment. In sacco organic matter (OM) degradability of the straw was increased (p<0.01) by around 20% for both the 4 min and 8 min microwave treatment, that of acid detergent fibre (ADF) was increased (p<0.01) by 61.6% and 62.8%, and that of ash free ADF was enhanced by 72.1% and 69.6% for the 4 min and 8 min microwave treatment respectively. No significant difference was observed between the 4 min and 8 min microwave treatment on the degradability of DM, OM, CP, ADF and ash-free ADF of the straw.
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High Precision and Low Force Resonant Probe Based on Quartz Tuning Fork
Qiangxian Huang,Wenqian Wang,Guangpu Wang,Rongjun Cheng,Liansheng Zhang,Hongli Li,Ruijun Li 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.11
To realize the high-precision three-dimensional (3D) measurement of micro-precision devices, a 3D resonant trigger probe based on quartz tuning fork for micro/nano coordinate measuring machine (CMM) is proposed. The probe is composed of a quartz tuning fork, a tapered optical fiber stylus and a microsphere. It vibrates in resonance state and makes contact with the measured surface in the Z direction in tapping mode, while in the X and Y directions, it operates in friction mode. The 3D nano-positioning of the probe is achieved by the changes in resonance parameter caused by the interatomic force between the microsphere and the surface of the measured sample. In this study, the diameter of the probe microsphere can be as low as 80 μm, and the length of the probe stylus is approximately 5 mm. The trigger resolution of the probe in the X, Y and Z directions are 0.44, 0.41 and 0.34 nm, respectively. The probing forces in the X, Y and Z directions are 2.25, 1.81 and 4.24 μN, respectively. Experimental results verify that the proposed probe has the advantages of small size, sub-nano resolution and very low probing force. This probe can be used as the trigger probe of micro/nano CMM, which can be triggered by interatomic force.
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