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ITD结合参数优化MOMEDA的滚动轴承故障特征提取 被引量:1
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作者 刘沛 彭珍瑞 何泽人 《机械科学与技术》 CSCD 北大核心 2024年第6期967-974,共8页
针对固有时间尺度分解(Intrinsic time scale decomposition,ITD)方法在强背景噪声影响下难以提取轴承故障特征的问题,提出了一种ITD与参数优化的多点最优最小熵解卷积(Multipoint optimal minimum entropy deconvolution adjusted,MOME... 针对固有时间尺度分解(Intrinsic time scale decomposition,ITD)方法在强背景噪声影响下难以提取轴承故障特征的问题,提出了一种ITD与参数优化的多点最优最小熵解卷积(Multipoint optimal minimum entropy deconvolution adjusted,MOMEDA)相结合的滚动轴承故障特征提取方法。首先根据包络谱峰值因子最大原则提取包含丰富故障信息的ITD分量,其次对该分量进行MOMEDA降噪处理。对影响MOMEDA滤波效果的两个参数——故障周期T与滤波器长度L分别以多点峭度和平方包络谱的基尼指数进行优化,最后进行包络谱分析提取故障特征频率。通过仿真信号与实测信号分析表明该方法能在强噪声干扰下有效提取故障特征。 展开更多
关键词 固有时间尺度分解 多点最优最小熵解卷积 滚动轴承 包络谱峰值因子 基尼指数
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Multiverse Version of Penrose CCC Cosmology, and Enhanced Quantization Compared 被引量:1
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作者 Andrew Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 2021年第2期559-571,共13页
We reduplicate the Book “Dark Energy” by M. Li, X.-D. Li, and Y. Wang, zero-point energy calculation with an unexpected “length” added to the “width” of a graviton wavefunction just prior to the entrance of “gr... We reduplicate the Book “Dark Energy” by M. Li, X.-D. Li, and Y. Wang, zero-point energy calculation with an unexpected “length” added to the “width” of a graviton wavefunction just prior to the entrance of “gravitons” to a small region of space-time prior to a nonsingular start to the universe. We compare this to a solution which worked out using Klauder Enhanced quantization, for the same given problem. The solution of the first Cosmological Constant problem relies upon the geometry of the multiverse generalization of CCC cosmology which is explained in this paper. The second solution used involves Klauder enhanced quantization. We look at energy given by our methods and compare and contrast it with the negative energy of the Rosen model for a mini sub-universe and estimate GW frequencies. 展开更多
关键词 minimum scale factor Cosmological Constant Space-Time Bubble Bouncing Cosmologies
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We Begin with a “Trivial” Condition on Massive Gravitons, and Use That to Examine Nonsingular Starts to Inflation, for GW, with GW Strength and Possible Polarization States? 被引量:1
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作者 Andrew Walcott Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 2020年第4期692-709,共18页
Our Methodology is to construct using a “trivial” solution to massive gravitons, and a nonsingular start for expansion of the universe. Our methodology has many unintended consequences, not the least is a relationsh... Our Methodology is to construct using a “trivial” solution to massive gravitons, and a nonsingular start for expansion of the universe. Our methodology has many unintended consequences, not the least is a relationship between a small time step, t, the minimum scale factor and even the tension or property values of the initial space-time wall, and that is a consequence of a “trivial” solution taking into account “massive” gravitons. <i>I.e.</i> this solution has a mass term times the partial derivative with respect to time of an expression in brackets. The expression in brackets is the cube of a scale factor minus the square of the scale factor. Bonus that this equation is set to zero. It is deemed trivial due to the insistence of having a singular solution. If that is dropped, we have a different venue. In addition, the Friedman equation for nonsingular cosmology can have a quadratic dependence upon a density (of space-time), leading to a way to incorporate right at the surface of the initial “space-time” bubble an uncertainty principle. From there we suggest a first principle Schrodinger equation, with the caveat that time does not exist, within the space-time nonsingular bubble, but is formed right afterwards. From there we again form solutions for strength of GW signals and suggestions as to polarization states. Our quest is motivated by our last articles question, where “We conclude by stating the following question. Can extra dimensions come from a Multiverse feed into Pre-Planckian space-time? See Theorem at the end of this publication. Our answer is in the affirmative, and it has intellectual similarities to George Chapline’s work with Black hole physics”. From there we next will in future articles postulate conditions for experimental detectors for subsequent data sets to obtain falsifiable data sets. 展开更多
关键词 minimum scale factor Cosmological Constant Space-Time Bubble Penrose Singularity
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A Solution of the Cosmological Constant and DE Using Breakup of Primordial Black Holes, via a Criteria Brought up by Dr. Freeze of Austin, Texas, Which Initiates DE as Linked to Inflation 被引量:2
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作者 Andrew Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 2021年第3期952-964,共13页
We reduplicate the Book “Dark Energy” by M. Li, X-D. Li, and Y. Wang, given zero-point energy calculation with an unexpected “length” added to the “width” of a graviton wave just prior to specifying the creation... We reduplicate the Book “Dark Energy” by M. Li, X-D. Li, and Y. Wang, given zero-point energy calculation with an unexpected “length” added to the “width” of a graviton wave just prior to specifying the creation of “gravitons”, while using Karen Freeze’s criteria as to the breakup of primordial black holes to give radiation era contributions to GW generation. The GW generation will be when there is sufficient early universe density so as to break apart Relic Black holes of the order of Planck mass (10<sup>15</sup> grams) which is about when the mass of relic black holes is created, 10<sup>-27</sup> or so seconds after expansion starts. Needles to state a key result will be in the initial potential V calculated, in terms of other input variables. 展开更多
关键词 minimum scale factor Cosmological Constant DE Arrow of Time
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Using Lorentz Violation for Early Universe GW Generation Due to Black Hole Destruction in the Early Universe as by Freeze 被引量:2
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作者 Andrew Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 2021年第3期993-1004,共12页
We are using information from a paper deriving a Lorentz-violating energy-momentum relation entailing an exact momentum cut of as stated by G. Salesi. Salesi in his work allegedly defines Pre Planckian physics, wherea... We are using information from a paper deriving a Lorentz-violating energy-momentum relation entailing an exact momentum cut of as stated by G. Salesi. Salesi in his work allegedly defines Pre Planckian physics, whereas we restrict our given application to GW generation and DE formation in the first 10<sup>-39</sup> s to 10<sup>-33</sup> s or so seconds in the early universe. This procedure is enacted due to an earlier work whereas referees exhibited puzzlement as to the physical mechanism for release of Gravitons in the very early universe. The calculation is meant to be complementary to work done in the Book “Dark Energy” by M. Li, X-D. Li, and Y. Wang, and also a calculation for Black hole destruction as outlined by Karen Freeze, <i>et al</i>. The GW generation will be when there is sufficient early universe density so as to break apart Relic Black holes but we claim that this destruction is directly linked to a Lorentz violating energy-momentum G. Salesi derived, which we adopt, with a mass m added in the G. Salesi energy momentum results proportional to a tiny graviton mass, times the number of gravitons in the first 10<sup>-43</sup> seconds. 展开更多
关键词 minimum scale factor Cosmological Constant DE
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基于自适应的单形采样UKF组合导航算法 被引量:4
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作者 黄平 孙婷婷 仝彦龙 《系统工程与电子技术》 EI CSCD 北大核心 2018年第7期1567-1572,共6页
在SINS/GPS组合导航系统中,传统的无迹卡尔曼滤波(unscented Kalman filter,UKF)采用对称采样无迹变换(unscented transform,UT),计算量大,而且采样点到中心点的距离会随着状态维数的增加而增大,产生采样的非局部效应。针对以上问题,利... 在SINS/GPS组合导航系统中,传统的无迹卡尔曼滤波(unscented Kalman filter,UKF)采用对称采样无迹变换(unscented transform,UT),计算量大,而且采样点到中心点的距离会随着状态维数的增加而增大,产生采样的非局部效应。针对以上问题,利用最小偏度单形采样策略降低UKF计算量以提高系统的实时性,采用比例UT变换来解决采样过程中的非局部效应,通过自适应调整比例因子来提高UKF的估计精度。由此引入了一种改进的UKF算法——自适应比例无迹卡尔曼滤波(adaptive scaled unscented Kalman filter,ASUKF)用于SINS/GPS组合导航系统中。仿真结果表明,这种方法计算量小且精度较高。 展开更多
关键词 无迹卡尔曼滤波 比例因子 自适应 单形采样 最小偏度
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Penrose Suggestion as to Pre Planck Era-Black Holes Showing Up in Present Universe Data Sets Discussed, with a Possible Candidate as to GW Radiation Which May Provide Initial CMBR Data 被引量:1
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作者 Andrew Walcott Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 2021年第4期1264-1277,共14页
What we are doing is three-fold. First, we examine the gist of the Penrose suggestion as to signals from a prior universe showing up in the CMBR. <i>i.e. </i>, this shows up as data in the CMBR. Second, we... What we are doing is three-fold. First, we examine the gist of the Penrose suggestion as to signals from a prior universe showing up in the CMBR. <i>i.e. </i>, this shows up as data in the CMBR. Second, we give a suggestion as to how super massive black holes could be broken up s of a prior Universe cycle by pre big bang conditions, with say millions of pre-Planck black holes coming up out of a breakup of prior universe black holes. Three, we utilize a discussion as to Bose Einstein Condensates set as Gravitons as to composing the early universe black holes. The BEC formulation gives a number N of gravitons, linked to entropy, per black hole, which could lead to contributions to the alleged CMBR perturbations, which were identified by Penrose <i>et al</i>. 展开更多
关键词 minimum scale factor Cosmological Constant Space-Time Bubble Penrose Singularity Prior Universe Black Holes
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Using Kiefer Density Matrix for Time Flow Analysis and How This Links to a Proof of Production of Planck Mass BHs during Inflation and Their Resulting Breakup, Leading to a DE Candidate 被引量:1
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作者 Andrew Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 2021年第3期1005-1018,共14页
We are using the book “Towards Quantum Gravity” with an article by Claus Kiefer as to a quantum gravity interpretation of the density matrix in the early universe. The density matrix we are using is a one loop appro... We are using the book “Towards Quantum Gravity” with an article by Claus Kiefer as to a quantum gravity interpretation of the density matrix in the early universe. The density matrix we are using is a one loop approximation, with inflaton value and potential terms, like V (phi) using the Padmanabhan values one can expect if the scale factor is a ~a (Initial) times t <sup>^</sup> gamma. In doing so, we identify two time steps and presume a very small initial time step candidates initial time values which are from a polynomial for time values. A gravity wave analysis concludes our article with inflaton decay, which is finally linked to BHs. And then finally we show using work done by Hawking, <i>et al</i>. how this may give us Planck Sized Black Holes, in the onset of Inflation, with resulting consequences so outlined. A vastly simplified proof of BH masses of Planck mass is presented which ties in directly with issues of the mass of the inflaton initially generated by the 2<sup>nd</sup> derivative of the effective potential V (phi) at a time t ~4 times Planck time. And we include at the close questions as to DE, and data sets which may give credence to speculation as to different time flow rates at the start and then the conclusion later on, of expansion of our universe. The DE would be created by the breakup of the black holes due to a mechanism brought up by Dr. Freeze in 2012, and we also are using the future works section 8 to define the contours of our DE model which builds upon quite directly the sequence of material from pages 1 to 9 which are cited as to making connection between early universe conditions and the ideas of primordial DE models. 展开更多
关键词 minimum scale factor Cosmological Constant Plank Mass BH DE
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Looking at Quantization of a Wave Function, from Weber (1961), to Signals from Wavefunctions at the Mouth of a Wormhole 被引量:1
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作者 Andrew Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 2021年第3期1037-1048,共12页
We utilize how Weber in 1961 initiated the process of quantization of early universe fields to the problem of what may be emitted at the mouth of a wormhole. While the wormhole models are well developed, there is as o... We utilize how Weber in 1961 initiated the process of quantization of early universe fields to the problem of what may be emitted at the mouth of a wormhole. While the wormhole models are well developed, there is as of yet no consensus as to how, say GW or other signals from a wormhole mouth could be quantized or made to be in adherence to a procedure Weber cribbed from Feynman, in 1961. In addition, we utilize an approximation for the Hubble parameter parameterized from Temperature using Sarkar’s H ~ Temperature relations, as given in the text. Finally, after doing this, we go to the Energy as E also ~ Temperature, and from there use E (energy) as ~ signal frequency. This gives us an idea of how to estimate frequency generated at the mouth of a wormhole. 展开更多
关键词 minimum scale factor Cosmological Constant Space-Time Bubble Bouncing Cosmologies
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多尺度边缘检测中尺度因子的选择
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作者 姬光荣 王宁 +1 位作者 屈新岳 陈霞 《青岛海洋大学学报(自然科学版)》 CSCD 1998年第2期317-322,共6页
基于二种典型边缘的尺度空间边缘检测结果,分析实际计算过程中数字信号的最小分辨率对尺度因子进化的约束,导出了尺度因子对给定边缘和最小分辨率的关系不等式。该结果从实际计算的角度解释了尺度定理的产生原因,同时为多尺度边缘检... 基于二种典型边缘的尺度空间边缘检测结果,分析实际计算过程中数字信号的最小分辨率对尺度因子进化的约束,导出了尺度因子对给定边缘和最小分辨率的关系不等式。该结果从实际计算的角度解释了尺度定理的产生原因,同时为多尺度边缘检测中尺度因子进化步长的选择提供了依据。 展开更多
关键词 尺度因子 最小分辨率 多尺度边缘检测 尺度定理
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附有相对权比的总体最小二乘平差 被引量:27
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作者 王乐洋 许才军 《武汉大学学报(信息科学版)》 EI CSCD 北大核心 2011年第8期887-890,共4页
推导了加权情况下附有相对权比的总体最小二乘平差方法,提出了确定相对权比的验前单位权方差法和目标函数最小化法。模拟算例表明,当观测值和系数矩阵的验前单位权方差已知且比较准确时,验前单位权方差法得到的结果与参数真值的差值范... 推导了加权情况下附有相对权比的总体最小二乘平差方法,提出了确定相对权比的验前单位权方差法和目标函数最小化法。模拟算例表明,当观测值和系数矩阵的验前单位权方差已知且比较准确时,验前单位权方差法得到的结果与参数真值的差值范数最小;目标函数最小化法的目标函数估值最小,与参数真值的差别比验前单位权方差法的结果稍大。 展开更多
关键词 标度总体最小二乘 相对权比 验前单位权方差法 目标函数最小化法 平差
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Quantization Conditions, for a Wormhole Wave Function Revisited, as to How a Wormhole Throat Could Generate GW and Gravitons: Simple Version of Negative Energy Form Wormhole Obtained from First Principles, and Comparison with Tokamak GW/Gravitons Done
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作者 Andrew Walcott Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2023年第1期124-133,共10页
We revisit how we utilized how Weber in 1961 initiated the process of quantization of early universe fields to the issue of what was for a wormhole mouth. While the wormhole models are well understood, there is not su... We revisit how we utilized how Weber in 1961 initiated the process of quantization of early universe fields to the issue of what was for a wormhole mouth. While the wormhole models are well understood, there is not such a consensus as to how the mouth of a wormhole could generate signals. We try to develop a model for doing so and then revisit it, the Wormhole while considering a Tokamak model we used in a different publication as a way of generating GW, and Gravitons. 展开更多
关键词 minimum scale factor Cosmological Constant Space-Time Bubble Bouncing Cosmologies TOKAMAKS
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Does the Penrose Suggestion as to Black Holes from a Prior Universe Showing Up in Today’s Universe Have Credibility? Examined from a Singular, and Nonsingular Beginning of Cosmological Expansion
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作者 Andrew Walcott Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 2021年第1期149-171,共23页
We examine if there are grounds to entertain the Penrose suggestion as to black holes from a prior cycle of creation appearing in the present cosmos. There are two cases to consider. One a singular start to the Univer... We examine if there are grounds to entertain the Penrose suggestion as to black holes from a prior cycle of creation appearing in the present cosmos. There are two cases to consider. One a singular start to the Universe or as Karen Freeze and others have modeled a non-singular start. The two cases are different and touch upon the limits of validity of the Penrose singularity theorem. We will first of all state the two cases, singular and nonsingular, and then afterwards, briefly allude to the Penrose singularity theorem. The plausibility of the singular cosmological expansion start point w case analysis of Black holes from a prior universe will be discussed first Afterwards, a synopsis of the Penrose singularity theorem. After that, the Nonsingular case of a starting point of the expansion of the Universe will be entertained and described. Since the nonsingular start to the expansion of the Universe is not so well known, a considerable amount of space will be spent upon what I view as mathematical constructions allowing for its analysis. About the only way to ascertain these cases will be by GW astronomy, hence the details of GW production from the early Universe will be covered in excruciating detail. The methodology for that section is simple. Use a construction for a minimal time-step, then from there get emergent space-time conditions for a bridge from a nonsingular start to the universe, to potential Quantum gravity conditions. Our Methodology is to construct using a “trivial” solution to massive gravitons, and a nonsingular start for expansion of the universe. Our methodology has many unintended consequences, not the least is a relationship between a small timestep, which is called <i>t</i>, and then the minimum scale factor and even the tension or property values of the initial space-time wall, all of which are a consequence of a “trivial” solution taking into account “massive” gravitons. From there we next will in future articles postulate conditions for experimental detectors for subsequent data sets to obtain falsifiable data sets. Finally upon doing this, the outlines of the way to ascertain data sets as to either falsify or confirm the Penrose suggestion will be the final concluding part of the manuscript. 展开更多
关键词 minimum scale factor Cosmological Constant Space-Time Bubble Penrose Singularity Prior Universe Black Holes
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How the Narlikar Argument of Quantum Gravity Can Be Combined with the Cosmological Constant We Calculated to Obtain Quantum Gravity Effects for Plank Length Values, as Opposed to 2 Times Planck Length Values
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作者 Andrew Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 2021年第2期445-451,共7页
We take the results where we reduplicate the Book “Dark Energy” by M. Li, X-D. Li, and Y. Wang, zero-point energy calculation, as folded in with the Klauder methodology, as given in a prior publication. From there w... We take the results where we reduplicate the Book “Dark Energy” by M. Li, X-D. Li, and Y. Wang, zero-point energy calculation, as folded in with the Klauder methodology, as given in a prior publication. From there we first access the Rosen solution to a mini universe energy to ascertain an energy value of t, the pre-inflationary near singularity, then access what would be needed as to inject information into our universe. We then close with an argument by Narilkar as to a quantum bound on the Einstein-Hilbert action integral, so as to obtain quantum Gravity. Narlikar omits the cosmological constant. We keep it in, for our overall conclusion about the cosmological constant and its relevance to Quantum gravity. 展开更多
关键词 minimum scale factor Cosmological Constant Space-Time Bubble Bouncing Cosmologies
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Calculating the Cosmological Constant, and a Minimal Time Step, for Our Present Universe. In Fidelity to the Topics Spoken as a Presenter in the Zeldovich 4 Conference, September 11, 2020
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作者 Andrew Walcott Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 2021年第2期403-415,共13页
The following is a rendition of what was presented by the author, September 11, 2020 in the DE section of that conference. The topics, while not original, are in strict fidelity with the topics the author was allowed ... The following is a rendition of what was presented by the author, September 11, 2020 in the DE section of that conference. The topics, while not original, are in strict fidelity with the topics the author was allowed to present in ICRANET Zeldovich 4, 2020. We present a history of the evolution of the cosmological constant “issue” starting with its introduction by Einstein for a static universe, which did not work out because his static universe solution to the Ricci Scalar problem, and GR was and is UNSTABLE. Another model of the cosmological constant has a radius of the Universe specified which is proportional to one over the square root of the cosmological constant, whereas our idea is to use the matching of two spacetime first integrals, for isolating a nonperturbative cosmological constant solution right at the surface of the start of expansion of the universe, <i>i.e.</i> a phenomenological solution to the cosmological constant involves scaling of a radius of the PRESENT universe. Our presented idea is to instead solve the Cosmological constant at the surface of the initial space-time bubble, using the initially derived time step, delta t, as input for the Cosmological constant. As it is, the Zeldovich 4 Section I was in was for Dark Energy, so in solving the initial value of the Cosmological constant, I am giving backing to one of the models of DE as to why the Universe reaccelerates one billion years ago. We conclude as to a reference to a multiverse generalization of Penrose Cyclic Conformal Cosmology as input into the initial nonsingular space-time bubble. 展开更多
关键词 minimum scale factor Cosmological Constant Space-Time Bubble CCC Cosmology (Penrose)
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A Solution of the Cosmological Constant and DE and Arrow of Time, Using Model of a Nonsingular Universe from Rosen from Volume (56) Ettore Majorana International Science Series, Physics, 1991
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作者 Andrew Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 2021年第3期925-935,共11页
We reduplicate the Book “Dark Energy” by M. Li, X-D. Li, and Y. Wang, given zero-point energy calculation with an unexpected “length” added to the “width” of a graviton wave just prior to specifying the creation... We reduplicate the Book “Dark Energy” by M. Li, X-D. Li, and Y. Wang, given zero-point energy calculation with an unexpected “length” added to the “width” of a graviton wave just prior to specifying the creation of “gravitons”, using the Rosen and Israelit model of a nonsingular universe. In doing so we are in addition to obtaining a wavelength 10<sup>30</sup> times greater than Planck’s length so we can calculate DE, may be able to with the help of the Rosen and Israelit model have a first approximation as to the arrow of time, and a universe with massive gravity. We have left the particulars of the nonsingular starting point undefined but state that the Rosen and Israelit model postulates initial temperatures of 10<sup>-180</sup> Kelvin and also a value of about Planck temperature, at 10<sup>-3</sup> centimeters radii value which may satisfy initial conditions asked by t’Hooft for describing an arrow of time. A key assumption is that the DE is formed at 10<sup>-3</sup> cm, after an expansion of 10<sup>30</sup> times in radii, from the Planck length radius nonsingular starting point. The given starting point for DE in this set of assumptions is where there is a change in the cosmic acceleration, to a zero value, according to Rosen and Israel, with time <i>t</i> = 1.31 times 10<sup>-42</sup> seconds. That may be where we may specify a potential magnitude, <i>V</i>, which has ties into inflaton physics. The particulars of the model from Rosen and Israelit allow a solution to be found, without discussion of where that nonsingular starting point came from, a point the author found in need of drastic remedies and fixes. 展开更多
关键词 minimum scale factor Cosmological Constant Space-Time Bubble DE Arrow of Time
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Looking at Quantization Conditions, for a Wormhole Wavefunction, While Considering Differences between Magnetic Black Holes, Versus Standard Black Holes as Generating Signals from a Wormhole Mouth
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作者 Andrew Beckwith 《Journal of High Energy Physics, Gravitation and Cosmology》 2022年第1期67-84,共18页
We utilize how Weber in 1961 initiated the process of quantization of early universe fields to the problem of what may be emitted at the mouth of a wormhole. While the wormhole models are well developed, there is as o... We utilize how Weber in 1961 initiated the process of quantization of early universe fields to the problem of what may be emitted at the mouth of a wormhole. While the wormhole models are well developed, there is as of yet no consensus as to how, say GW or other signals from a wormhole mouth could be quantized or made to be in adherence to a procedure Weber cribbed from Feynman, in 1961. In addition, we utilize an approximation for the Hubble parameter parameterized from Temperature using Sarkar’s H ~ Temperature relations, as given in the text. We review what could be a game changer, <i>i.e.</i> magnetic black holes as brought up by Maldacena, in early 2021, at the mouth of the wormhole, and compare this with more standard black holes, at the mouth of a wormhole, while considering also the Bierman battery effect of an accreditation disk moving charges around a black hole as yet another way to have signals generated. The Maldacena article has good order of estimate approximations as to the strength of a magnetic monopole which we can use, and we also will go back to the signal processing effects which may be engendered by the Weber quantization of a wormhole to complete our model. 展开更多
关键词 minimum scale factor Cosmological Constant Space-Time Bubble Bouncing Cosmologies
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“强馈入弱开机”下电网安全运行关键技术研究 被引量:3
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作者 崔勇 冯煜尧 +1 位作者 杨增辉 王伟 《上海节能》 2015年第6期302-306,共5页
针对上海都市电网"强馈入弱开机"新常态,研究考虑多安全稳定因素的电网最小开机方式安排流程与评估方法,通过电力平衡、输电限额、降压容量、电压稳定、调峰平衡等综合性分析,量化评估上海电网最小开机方案下电网安全稳定裕度... 针对上海都市电网"强馈入弱开机"新常态,研究考虑多安全稳定因素的电网最小开机方式安排流程与评估方法,通过电力平衡、输电限额、降压容量、电压稳定、调峰平衡等综合性分析,量化评估上海电网最小开机方案下电网安全稳定裕度,在确保上海电网安全稳定运行的基础上,最大程度消纳西南水电清洁能源。 展开更多
关键词 强馈入弱开机 多安全稳定因素 最小开机方式安排 量化评估
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利用张量投票的机载LiDAR点云道路骨架线提取 被引量:6
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作者 秦和娟 管海燕 李迪龙 《计算机工程与应用》 CSCD 北大核心 2020年第18期193-201,共9页
针对机载LiDAR数据中道路骨架线检测存在的噪声干扰问题,结合道路多层特征显著性,提出了一种基于道路最大宽度快速确定最小尺度因子的张量投票道路骨架线提取方法。将预处理后三维道路点云转化成二维强度图像,最小尺度因子参与图像球张... 针对机载LiDAR数据中道路骨架线检测存在的噪声干扰问题,结合道路多层特征显著性,提出了一种基于道路最大宽度快速确定最小尺度因子的张量投票道路骨架线提取方法。将预处理后三维道路点云转化成二维强度图像,最小尺度因子参与图像球张量投票,利用极性特征分割道路边缘点;为了进一步增强道路线状特征,利用新的最小尺度因子再次进行球张量投票和棒张量投票,填补道路空洞,顺滑道路边界;细化处理获取道路骨架线。与数学形态学方法相比,该方法在噪声背景的道路数据中提取的道路线精度更高。 展开更多
关键词 张量投票 机载LiDAR点云 道路骨架线 最小尺度因子 多层特征显著性
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粗粒料级配缩尺中相似比例对密度影响的试验研究 被引量:1
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作者 万其微 刘斌云 +3 位作者 张延亿 温彦锋 邓刚 赵梦阳 《水利水电技术》 北大核心 2020年第6期157-163,共7页
针对粗粒料密度研究中变量复杂问题,为探究不同相似比例n值对试验材料密度变化的影响规律,以红石岩堰塞坝料的两条代表性级配为研究对象,在相同的试验条件和参数标准下,分别研究不同变量指标对密度的影响。结果显示:最大干密度和最小干... 针对粗粒料密度研究中变量复杂问题,为探究不同相似比例n值对试验材料密度变化的影响规律,以红石岩堰塞坝料的两条代表性级配为研究对象,在相同的试验条件和参数标准下,分别研究不同变量指标对密度的影响。结果显示:最大干密度和最小干密度均随相似比例n值的增加呈先增加后减小的变化趋势;同时,由于相似比例n值的不同引起了其它级配特征值的变化,材料P5含量在小于30%范围内变化时对最大干密度的影响较为明显,随P5含量的增大呈增大趋势;Cu/Cc对密度的影响与P5相似,下凹型级配中最大干密度和最小干密度随中值粒径d50增大呈先增大后减小,总体趋于减小的变化规律。结果表明:相似比例n值会影响材料之间粗细颗粒的填充关系,对下凹型级配曲线密度产生明显影响,对平均级配曲线影响较小,室内试验时需选择适宜的相似比例。 展开更多
关键词 粗粒料 级配缩尺 相似比例 最大干密度 最小干密度 试验 影响因素
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