基于三轴分析与功能模型融合的问题识别研究及应用

针对TRIZ割裂静态的使用因果与功能模型等分析工具导致无法高效准确识别解决工程问题的现状,在TRIZ分析理论的基础上,通过对三轴分析与功能模型的创新融合,形成新的TRIZ分析流程,新流程加强分析工具间的相互作用,及时准确的对问题再定义,锁定问题关键因子,实现对工程核心问题的识别,并用纯电动矿用车能量反馈不足的工程实例分析创新流程的合理性与可实施性,创新流程旨在帮助工程技术人员识别隐藏在问题背后的根原因,找到宏观微观层面的核心关键问题,达到准确定义问题核心与本质的目的。

基于“三轴图”分析法的我国海洋产业结构演进及优化分析

海洋产业结构的优化调整对海洋经济的发展至关重要。运用"三轴图"分析法和GRA分析法分别分析我国海洋产业结构的演进过程以及我国海洋产业中的主导产业。结果表明:我国海洋产业结构已经实现了三二一的产业结构模式,但渔业等传统产业仍旧占据着主导地位,而高新技术产业的比重十分低。最后针对分析结果,给出相应的对策建议。

同一平面的三轴运动分析

一种承印台对位调整方式的新颖机构,实现同一平面的三轴运动。

TRIZ理论在提高十二烷基糖苷过滤效率中的应用

利用TRIZ理论的分析和解题工具,对十二烷基葡糖苷过滤效率低的问题进行组件功能组件分析、三轴分析、因果分析、资源分析、技术矛盾分析,使用裁剪、分离以及创新原理等工具对问题进行求解,提出了一系列改进的方案,不断创新,最终得出一个最佳的改进方案,可以有效提高过滤效率,降低设备成本。

浙江舟山群岛新区海洋产业结构演进研究——兼论海洋产业结构演替的特殊规律性

海洋产业结构演进不同于传统陆地产业结构演进路径,它存在着特殊规律性。舟山群岛新区是我国第一个以海洋经济为主题的国家级新区,海洋经济特性明显。本文采用三轴图分析方法,对1990-2012年舟山群岛新区三次产业结构进行深入分析,分四个阶段探讨了其海洋产业结构演进过程。在此基础上,对海洋产业结构演替的特殊规律性进行归纳和总结。

基于TRIZ理论低成本解决钢丝拉拔磨损

TRIZ是解决创造性问题的理论和方法,目前已经在国际获得大规模应用。李克强总理提出"大众创业,万众创新"政策以来,TRIZ成为国内关注的热点。本文通过使用TRIZ功能模型、三轴分析、技术矛盾和技术进化法则等工具,探讨了TRIZ方法在钢丝拉拔过程磨损问题中的应用,并从低成本的角度解决问题。

港口经济产业结构的动态演化特征——基于浙江舟山港企业微观数据的实证研究

在“调结构、转方式”的新常态经济背景和“海洋强国”“海上丝绸之路”的重要举措下,港口经济经历了优化结构、减速增效的调整发展时期,同时这些举措的实施为港口经济带来了发展契机。在现有的国民经济产业研究中,港口经济尚未有统一的定义,港口经济活动不仅包括运输,还包括诸如仓储、装卸、金融、租赁等散布于其他产业的活动,是一个由多部门、多产业构成的综合、复杂的运行系统。因此,探究港口经济的产业结构特征,有助于掌握港口经济的发展状况,厘清港口经济的运行机制,优化港口经济发展的政策设计,实现港口经济的长效发展。文章根据2011—2020年浙江舟山港微观企业数据,依据港口业务的特征对港口经济产业进行界定与分类,并应用“三轴图”法和灰色关联分析法从重心位置和灰色关联度两个角度探究港口经济产业结构的演化特征与动态路径。

Accurate estimation of soil shear strength parameters

The cost and safety of geotechnical engineering are highly depending on the accuracy of soil shear strength parameters.There are three methods often used to estimate soil shear strength parameters,i.e.,moment method,3-sigma rule and linear regression method.In this study,the accuracy of these three methods is compared.Traditional linear regression method(LRM)can only offer the mean of shear strength parameters.Some engineers misuse the standard error of shear strength indexes as the standard deviations.Such misuse may highly underestimate the uncertainty and induce high risk to the geotechnical design.A modified LRM is proposed to determine both the mean and variance of shear strength parameters.The moment method,three-sigma rule and LRM are used to analyze the tri-axial test data in Xiaolangdi Hydraulic Project and three numerical shear strength tests.The results demonstrate that:1)The modified LRM can offer the most accurate estimation to shear strength parameters;2)A dimensionless formula is much preferred in LRM rather than a dimensional formula.The stress ratio formula is much better than stress relation in the shear strength parameter analysis.The proposed method is applicable to shear strength parameter analysis for tri-axial test data,direct shear test and the un-drained shear strength test of stratified clay.

Strain rate effects on sand and its quantitative analysis

Strain rate effects on the stress-strain behavior of sand were investigated by performing special plane strain and triaxial compression tests on saturated and air-dried sand specimens. In these tests, the loading strain rate was changed many times by a factor of up to 1 000 during otherwise monotonous loading at a constant axial strain rate. Test results show that the stress jump upon a stepwise change in the strain rate decays with an increase in the irreversible strain when monotonous loading continues at the changed strain rate and the amount of stress jump is essentially proportional to the instantaneous stress. Based on the amount of these stress jumps, a parameter fl called the rate-sensitivity coefficient is introduced to represent the quantity of the observed viscous properties of sand, which equals 0.021 3 and 0.024 2 respectively for Hostun and Toyoura sands. Further analyses on the results indicate that the effect of the presence of pore water is deemed to be negligible with sand and the fl value is rather independent of loading method, wet condition and confining pressure.

Research on identifying the dynamic error model of strapdown gyro on 3-axis turntable

The dynamic errors of gyros are the important error sources of a strapdown inertial navigation system. In order to identify the dynamic error model coefficients accurately, the static error model coefficients which lay a foundation for compensating while identifying the dynamic error model are identified in the gravity acceleration fields by using angular position function of the three-axis turntable. The angular acceleration and angular velocity are excited on the input, output and spin axis of the gyros when the outer axis and the middle axis of a three-axis turntable are in the uniform angular velocity state simultaneously, while the inner axis of the turntable is in different static angular positions. 8 groups of data are sampled when the inner axis is in 8 different angular positions. These data are the function of the middle axis positions and the inner axis positions. For these data, harmonic analysis method is applied two times versus the middle axis positions and inner axis positions respectively so that the dynamic error model coefficients are finally identified through the least square method. In the meantime the optimal angular velocity of the outer axis and the middle axis are selected by computing the determination value of the information matrix.

Local Data Analysis for Eliminating End Restraint of Triaxial Specimen

A data processing method was proposed for eliminating the end restraint in triaxial tests of soil. A digital image processing method was used to calculate the local deformations and local stresses for any region on the surface of triaxial soil specimens. The principle and implementation of this digital image processing method were introduced as well as the calculation method for local mechanical properties of soil specimens. Comparisons were made between the test results calculated by the data from both the entire specimen and local regions, and it was found that the deformations were more uniform in the middle region compared with the entire specimen. In order to quantify the nonuniform characteristic of deformation, the non-uniformity coefficients of strain were defined and calculated. Traditional and end-lubricated triaxial tests were conducted under the same condition to investigate the effects of using local region data for deformation calculation on eliminating the end restraint of specimens. After the statistical analysis of all test results, it was concluded that for the tested soil specimen with the size of 39.1 mm × 80 ram, the utilization of the middle 35 mm region of traditional specimens in data processing had a better effect on eliminating end restraint compared with end lubrication. Furthermore, the local data analysis in this paper was validated through the comparisons with the test results from other researchers.

Analytical solutions for a uniformly loaded circular plate with clamped edges

A bi-harmonic potential function was constructed in this study. Love solution was employed to obtain analytical solutions of uniformly loaded plates with two different types of clamped edges. The treatment of clamped boundary conditions was the same as that adopted by Timoshenko and Goodier (1970). The analytical solution for the first type of clamped boundary condition is identical with that obtained by Luo et al.(2004), and the solutions for both types were compared with the FEM results and the calculations of thin plate theory.

A triaxial creep model for coal containing gas and its stability analysis

Triaxial creep tests on CCG specimens were systematically performed using aself-made creep seepage experimental apparatus for determining the creep law of CCG.An improved triaxial creep model of CCG was established on the basis of a Nishiharamodel and another visco-elasto-plastic model,parameters of which were fitted on test data.Furthermore,the creep model is validated according to the result of triaxial creep experiments,and the outcome shows that the proposed triaxial creep model can properly characterizethe properties of various creep deformation phases of CCG,especially the acceleratingcreep phase.At the same time,the instability conditions of CCG were presentedbased on the discussion of the improved model's stability in terms of stability theories ofdifferential equation solution.

Finite element and experimental analysis of pinion bracket-assembly of three gorges project ship lift

The pinion bracket-assembly(PBA) is a major part of three gorges project(TGP) ship lift drive system. The static strength,fatigue strength and stress distribution of hinge pin of PBA were analyzed by ANSYS, and the structure of PBA was optimized. The results show that after the optimization, the maximum comprehensive stress is 259.59 MPa, the maximum fatigue cumulative damage of weld joints is 0.94 and the maximum vertical deformation of hinge pin is 0.14 mm. The elastic deformation, hydropneumatic spring cylinder(HSC) load response and the vibration characteristics of PBA were studied by the bearing test when PBA bore the load caused by different water level errors. The results indicate that when the water level of ship chamber ranges from 3.4 m to 3.6 m,the vertical elastic deformation of the pinion shaft is between-8.58 and 10.50 mm. When upward outage-load(1580 k N) is imposed by the test-rack, the vertical elastic deformation of the pinion shaft is 13.42 and 14.07 mm and HSC load response is 795.80-800.80 k N. In the process of imposing load on the pinion by the test-rack, the maximum vibration amplitude and acceleration of PBA internal components are 0.37° and 2.67 rad/s2, respectively; the maximum impact on the pin caused by vibration is 19.89 k N; the pinion shaft vertical displacement and HSC load response do not fluctuate. There is a great difference between the frequency of meshing force of the pinion and the rack(1.06 Hz) and first-order natural frequency of PBA(8.41 Hz), thus PBA will not resonate.From all above, PBA meets the static strength and fatigue strength requirements. The vibration of PBA internal components has no effect on the vertical displacement of the pinion shaft, HSC load response and smooth operation of PBA. There is a liner relationship in the ratio of 2:1 between the thrust imposed by the test-rack and HSC load, thus HSC can limit the load imposed on the pinion.

Stress-strain analysis of loess triaxial shear test by PFC^(3D)

In order to compensate for limitations of microscopic study on loess triaxial tests, taking the loess in Longxi area as an example, the authors established the loess triaxial test model by using PFC3D software and simulating tfiaxial shear test under the different confining pressures in 0 kPa, 50 kPa and 300 kPa. Compared with laboratory triaxial shear test, the numerical simulation test has a guiding role in loess mechanical strength analysis.