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CPG Human Motion Phase Recognition Algorithm for a Hip Exoskeleton with VSA Actuator
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作者 Jiaxuan Li Feng Jiang +6 位作者 Longhai Zhang Xun Wang Jinnan Duan Baichun Wei Xiulai Wang Ningling Ma Yutao Zhang 《Journal of Signal and Information Processing》 2024年第2期19-59,共41页
Due to the dynamic stiffness characteristics of human joints, it is easy to cause impact and disturbance on normal movements during exoskeleton assistance. This not only brings strict requirements for exoskeleton cont... Due to the dynamic stiffness characteristics of human joints, it is easy to cause impact and disturbance on normal movements during exoskeleton assistance. This not only brings strict requirements for exoskeleton control design, but also makes it difficult to improve assistive level. The Variable Stiffness Actuator (VSA), as a physical variable stiffness mechanism, has the characteristics of dynamic stiffness adjustment and high stiffness control bandwidth, which is in line with the stiffness matching experiment. However, there are still few works exploring the assistive human stiffness matching experiment based on VSA. Therefore, this paper designs a hip exoskeleton based on VSA actuator and studies CPG human motion phase recognition algorithm. Firstly, this paper puts forward the requirements of variable stiffness experimental design and the output torque and variable stiffness dynamic response standards based on human lower limb motion parameters. Plate springs are used as elastic elements to establish the mechanical principle of variable stiffness, and a small variable stiffness actuator is designed based on the plate spring. Then the corresponding theoretical dynamic model is established and analyzed. Starting from the CPG phase recognition algorithm, this paper uses perturbation theory to expand the first-order CPG unit, obtains the phase convergence equation and verifies the phase convergence when using hip joint angle as the input signal with the same frequency, and then expands the second-order CPG unit under the premise of circular limit cycle and analyzes the frequency convergence criterion. Afterwards, this paper extracts the plate spring modal from Abaqus and generates the neutral file of the flexible body model to import into Adams, and conducts torque-stiffness one-way loading and reciprocating loading experiments on the variable stiffness mechanism. After that, Simulink is used to verify the validity of the criterion. Finally, based on the above criterions, the signal mean value is removed using feedback structure to complete the phase recognition algorithm for the human hip joint angle signal, and the convergence is verified using actual human walking data on flat ground. 展开更多
关键词 Variable Stiffness Actuator Plate Spring CPG Algorithm Convergence Criterion Human motion phase Recognition Simulink and Adams Co-Simulation
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Gravitation and the Unified Nature of All Kinds of Motion in Non-Empty Space (Part 1)
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作者 Yuri N. Ivanov Anton V. Pinchuk 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2024年第4期1918-1932,共15页
The presented work examines the mechanism and conditions of self-motion in bodies as systems of interacting elements. It is shown how the oscillation parameters of these elements determine the mode of motion of the sy... The presented work examines the mechanism and conditions of self-motion in bodies as systems of interacting elements. It is shown how the oscillation parameters of these elements determine the mode of motion of the system (body). In this case, the motion is considered as a consequence of symmetry breaking of forces in the systems themselves, and not as a reaction of individual elements to external influences. It is shown that such a violation takes place both in the gravitational field and when the system moves by inertia. Examples of the influence of changes in phase (φ) and frequency (f) parameters of the system elements on the velocity mode of its motion in space are considered. The identity of the causes of self-motion is revealed both in the case of gravitation and inertial motion. 展开更多
关键词 GRAVITATION SELF-motion phase Frequency Time Rate Standing Wave Potential Well Standing Wave Node MOMENTUM Quantity of motion
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Motion of a Nonrelativistic Quantum Particle in Non-commutative Phase Space
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作者 FATEME Hoseini 马凯 HASSAN Hassanabadi 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第10期5-8,共4页
The equation governing the motion of a quantum particle is considered in nonrelativistic non-commutative phase space. For this aim, we first study new Poisson brackets in non-commutative phase space and obtain the mod... The equation governing the motion of a quantum particle is considered in nonrelativistic non-commutative phase space. For this aim, we first study new Poisson brackets in non-commutative phase space and obtain the modified equations of motion. Next, using novel transformations, we solve the equation of motion and report the exact analytical solutions. 展开更多
关键词 motion of a Nonrelativistic Quantum Particle in Non-commutative phase Space NCS
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A Hydrodynamic Model Including Phase Transition and the Thermal Motion Induced Transverse Momentum Distributions in p-p Collisions at LHC Energies
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作者 Zhijin Jiang Dongfang Xu Yu Zhang 《Journal of High Energy Physics, Gravitation and Cosmology》 2018年第1期20-30,共11页
It is widely believed that the matter created in p-p collisions exhibits a similar collective behavior as that formed in heavy ion collisions. In this paper, by taking into account the effects of thermal motion, the t... It is widely believed that the matter created in p-p collisions exhibits a similar collective behavior as that formed in heavy ion collisions. In this paper, by taking into account the effects of thermal motion, the transverse momentum distributions of identified charged particles are discussed in the scope of the hydrodynamic model including phase transition. The theoretical model gives a good description to the data collected in p-p collisions at LHC energies for the transverse momentum up to about . 展开更多
关键词 Thermal motion RELATIVISTIC Hydrodynamics phase Transition Transverse MOMENTUM Distribution
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A stochastic model of the Fourier phase of strong ground motion
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作者 廖振鹏 金星 《Acta Seismologica Sinica(English Edition)》 CSCD 1995年第3期435-446,共12页
The notion of equivalent dispersion of strong seismic waves is further illuminated and a frequency-dependentstochastic model of the Fourier phase of strong earthquake ground motion is presented for use in statistical ... The notion of equivalent dispersion of strong seismic waves is further illuminated and a frequency-dependentstochastic model of the Fourier phase of strong earthquake ground motion is presented for use in statistical estimates of the Fourier phase. The non-stationary features of design ground motions synthesized using the phasemodel in combination with the empirical attenuation model of amplitude spectra of strong ground motion are ableto be consistent with those of observed records in the sense of statistics. 展开更多
关键词 phase analysis stocbastic model strong ground motion equivalent dispersion
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High-Precision Wideband Phase-Derived Velocity Measurement for Micro-Motion Extraction
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作者 Yuan Jiang Huayu Fan +1 位作者 Quanhua Liu Xinliang Chen 《Journal of Beijing Institute of Technology》 EI CAS 2017年第1期106-114,共9页
A phase-derived velocity measurement method is proposed in a wideband coherent system,based on a precise echo model considering the inner pulse Doppler effect caused by fast moving targets.The Cramer-Rao low band of v... A phase-derived velocity measurement method is proposed in a wideband coherent system,based on a precise echo model considering the inner pulse Doppler effect caused by fast moving targets.The Cramer-Rao low band of velocity measurement precision is deduced,demonstrating the high precision of the proposed method.Simulations and out-field experiments further validate the effectiveness of the proposed method in high-precision measurement and micro-motion extraction for targets with weak reflection intensity.Compared with the long-time integration approaches for velocity measurement,the phase-derived method is easy to implement and meets the requirement for high data rate,which makes it suitable for micro-motion feature extraction in wideband systems. 展开更多
关键词 phase-derived velocity measurement micro-motion extraction wideband coherent sys-tem high-precision measurement
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基于介电泳的液滴动力学行为研究
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作者 郭星 张宝生 +6 位作者 陈家庆 曲柏宇 安申法 栾智勇 董建宇 石熠 高一鸣 《化学工程》 CAS CSCD 北大核心 2024年第7期64-69,共6页
为探究非均匀电场下液滴受介电泳作用的运动及变形,采用COMSOL Multipysics TM软件,研究波纹板-平板电极结构下液滴的运动与变形规律,讨论平板-平板电极与波纹板-平板电极的液滴动力学差异,分析电场参数、工质参数对单个液滴运动速度及... 为探究非均匀电场下液滴受介电泳作用的运动及变形,采用COMSOL Multipysics TM软件,研究波纹板-平板电极结构下液滴的运动与变形规律,讨论平板-平板电极与波纹板-平板电极的液滴动力学差异,分析电场参数、工质参数对单个液滴运动速度及变形的影响。结果表明:随着时间增加,较平板-平板电极结构,波纹板-平板电极结构中液滴速度与变形差异逐渐增大;随着电压幅值增加,电场梯度的增大导致液滴速度增加,最高增至3.03 mm/s,同时电场力的增加导致液滴变形加剧;交流矩形波对液滴运动速度及变形的影响强于交流正弦波、交流三角波、交流锯齿波;随着油相黏度减小,液滴所受阻力减小,其运动速度及变形增大,0.2 Pa·s时液滴的最大变形量可以达到3.73;当液滴位置逐渐靠近波谷位置,其所受电场强度及电场力逐渐增加,导致液滴运动速度及形变量增加。相关结论可为原油脱水与油静电净化领域提供理论基础。 展开更多
关键词 液滴 电场 相场 运动速度 变形度
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硬质颗粒参数对列车增黏撒砂喷射行为的影响
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作者 岳子恒 张沭玥 +4 位作者 叶浩 丁昊昊 郭俊 王文健 刘启跃 《中国机械工程》 EI CAS CSCD 北大核心 2024年第11期2054-2062,共9页
为研究颗粒参数对列车增黏撒砂喷射行为的影响,利用可视化检测技术开展不同颗粒粒径、形状和密度下喷射行为试验,分析各因素对喷射速度、扩散角度的影响权重,探究不同颗粒在撒砂装置内部运动特征及影响机理。研究结果表明:随着颗粒粒径... 为研究颗粒参数对列车增黏撒砂喷射行为的影响,利用可视化检测技术开展不同颗粒粒径、形状和密度下喷射行为试验,分析各因素对喷射速度、扩散角度的影响权重,探究不同颗粒在撒砂装置内部运动特征及影响机理。研究结果表明:随着颗粒粒径、密度的增大,颗粒喷射速度和扩散角度均逐渐减小,不规则颗粒的扩散角度普遍大于近圆形颗粒的扩散角度;喷射速度显著影响因素权重(从大至小)为:粒径、密度;扩散角度显著影响因素权重(从大至小)为:形状、粒径;颗粒粒径和密度与所受气固耦合力成正比,与初始时刻颗粒加速度成反比,不规则颗粒的碰撞次数高于近圆形颗粒的碰撞次数;根据耦合力和动能的变化规律将颗粒运动特征分为加速和稳定两个阶段,初始时刻颗粒加速决定颗粒在稳定阶段所获动能大小。 展开更多
关键词 增黏硬质颗粒 喷射速度 扩散角度 气固两相流仿真 颗粒运动特征
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多目视觉系统在电芯自动上料设备中的应用 被引量:2
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作者 王行洲 秦立宇 +4 位作者 陈亮宏 尹东海 王浩 陈春来 陈亮 《机械研究与应用》 2024年第1期150-152,156,共4页
通过对多目视觉系统的研究与验证,探讨了电芯自动上料设备中多目视觉系统的配置要求、部署方案、现实意义,解决了工业机器人在抓取过程中存在的定位不准确的问题,极大适应了电池电芯出厂包装中电芯分布零散、分布层次较多的实际状况,解... 通过对多目视觉系统的研究与验证,探讨了电芯自动上料设备中多目视觉系统的配置要求、部署方案、现实意义,解决了工业机器人在抓取过程中存在的定位不准确的问题,极大适应了电池电芯出厂包装中电芯分布零散、分布层次较多的实际状况,解决了现有行业生产过程中存在的设备抓取效率低、定位准确度差、实际生产过程稳定性差等问题,大大提高了生产效率。 展开更多
关键词 多目视觉系统 极性检测 距离检测 旋转相位 机器人随动
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基于虚拟功角功率控制的VSG增强功率解耦策略
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作者 杜建鹏 赵晋斌 +2 位作者 曾志伟 毛玲 屈克庆 《中国电机工程学报》 EI CSCD 北大核心 2024年第22期8808-8818,I0010,共12页
虚拟同步机可提升“双高”电力系统惯性,但其存在的固有功率强耦合会产生功率稳态误差,严重限制变流器功率传输能力,甚至导致系统失稳。为此,该文详细分析VSG功率耦合机理,指出线路阻感比R/X与功角θ是影响功率耦合两大因素,并评估其引... 虚拟同步机可提升“双高”电力系统惯性,但其存在的固有功率强耦合会产生功率稳态误差,严重限制变流器功率传输能力,甚至导致系统失稳。为此,该文详细分析VSG功率耦合机理,指出线路阻感比R/X与功角θ是影响功率耦合两大因素,并评估其引起的功率耦合对稳定性影响。然后在虚拟电感控制基础上考虑R/X和θ,提出一种基于虚拟功角的功率控制策略,使用理论公式计算虚拟功角值改进功率环控制,增强了大范围功角情况下功率解耦效果,抑制了无功功率波动,并用幅相运动方程判据评估该系统稳定性。最后,通过理论分析和实验结果验证所提解耦控制策略的有效性。 展开更多
关键词 虚拟同步机 功率解耦 幅相运动方程 虚拟电感 虚拟功角
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基于CFD-DPM的离心泵内颗粒性质对泵性能与磨损的影响 被引量:1
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作者 陈正甦 衡亚光 +3 位作者 熊平 江启峰 罗西棚 申坤 《西华大学学报(自然科学版)》 2024年第1期87-96,102,共11页
为揭示离心泵在输送固液两相流时颗粒密度和粒径对泵性能和磨损的影响,采用Realizable k-ε湍流模型(液相)和DPM离散相模型,对模型泵内固液两相流动进行定常数值模拟,研究固液两相流场中颗粒的运动轨迹以及磨损规律。结果表明:随着颗粒... 为揭示离心泵在输送固液两相流时颗粒密度和粒径对泵性能和磨损的影响,采用Realizable k-ε湍流模型(液相)和DPM离散相模型,对模型泵内固液两相流动进行定常数值模拟,研究固液两相流场中颗粒的运动轨迹以及磨损规律。结果表明:随着颗粒密度和粒径的增大,模型泵的扬程和效率均下降;密度、粒径越大的颗粒,其运动轨迹越易偏向叶片工作面;随着颗粒密度的增加,叶片工作面以及蜗壳内的磨损程度加剧,但是叶片背面的磨损减轻,颗粒相应地在叶片工作面和蜗壳外壁边缘聚集;随着颗粒粒径的增大,蜗壳整体磨损程度加重,其中蜗壳的隔舌区域、Ⅱ区域和Ⅵ区域磨损程度最严重;叶片整体磨损程度逐渐降低,且叶片工作面磨损程度大于叶片背面。 展开更多
关键词 离心泵 固液两相流 磨损 数值模拟 运动轨迹
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Phase-Division-Based Dynamic Optimization of Linkages for Drawing Servo Presses 被引量:4
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作者 Zhi-Gang Zhang Li-Ping Wang Yan-Ke Cao 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2017年第6期1426-1437,共12页
Existing linkage-optimization methods are designed for mechanical presses; few can be directly used for servo presses, so development of the servo press is limited. Based on the complementarity of linkage opti- mizati... Existing linkage-optimization methods are designed for mechanical presses; few can be directly used for servo presses, so development of the servo press is limited. Based on the complementarity of linkage opti- mization and motion planning, a phase-division-based linkage-optimization model for a drawing servo press is established. Considering the motion-planning principles of a drawing servo press, and taking account of work rating and efficiency, the constraints of the optimization model are constructed. Linkage is optimized in two modes: use of either constant eccentric speed or constant slide speed in the work segments. The performances of optimized link- ages are compared with those of a mature linkage SL4- 2000A, which is optimized by a traditional method. The results show that the work rating of a drawing servo press equipped with linkages optimized by this new method improved and the root-mean-square torque of the servo motors is reduced by more than 10%. This research pro- vides a promising method for designing energy-saving drawing servo presses with high work ratings. 展开更多
关键词 Drawing servo press Linkage optimization phase-division motion planning
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The relation between the response spectrum and the phase diference spectrum 被引量:1
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作者 赵凤新 胡聿贤 《Acta Seismologica Sinica(English Edition)》 CSCD 1996年第3期13-18,共6页
The relation between the phase difference spectrum and the response spectrum is studied in this paper. It is found that the phase difference spectrum influences the response spectrum through affecting the response ... The relation between the phase difference spectrum and the response spectrum is studied in this paper. It is found that the phase difference spectrum influences the response spectrum through affecting the response motion′s envelope function shape of a single degree of freedom system. Decreasing the variance of phase difference spectrum causes the increasing of response spectrum when its mean value curve keeps the same, otherwise the situation is opposite. As the increase of the tangent of the mean value curve, the response spectrum decreases, otherwise it increases. The damping plays an important role while the phase difference spectrum influences the response spectrum. The effect of the phase difference spectrum on the absolute acceleration response spectrum becomes more and more obvious with the increase of the damping. On the other hand, the increase of damping weakens the effect of the phase difference spectrum on the amplification factor spectrum. 展开更多
关键词 ground motion response spectrum phase difference spectrum.
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MOTION COMPENSATION USING SUBSTRIP PGA 被引量:1
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作者 Zhang Lei Liu Yabo Yang Liang 《Journal of Electronics(China)》 2014年第4期317-324,共8页
MOtion COmpensation(MOCO) is an essential step in high resolution airborne Synthetic Aperture Radar(SAR) imaging. Generally, a reference altitude level is assumed and external Digital Elevation Model(DEM) is required ... MOtion COmpensation(MOCO) is an essential step in high resolution airborne Synthetic Aperture Radar(SAR) imaging. Generally, a reference altitude level is assumed and external Digital Elevation Model(DEM) is required for the scene topography heavily varied. To overcome the shortcoming, we propose a MOCO method based on Phase Gradient Autofocus(PGA) which can obtain well focused images without DEM. In the implementation, we first compensate the normal range-invariant term. Then the data are divided into strips in range-compressed domain and PGA is applied to each substrip to extract the phase errors. Finally, the phase error surface is obtained using interpolation and then compensated. Real airborne SAR data of a UAV-SAR system experiments and comparisons demonstrate the validity and effectiveness of the proposed algorithm. The results show that our algorithm is effective. 展开更多
关键词 Synthetic Aperture Radar (SAR) motion COmpensation (MOCO) phase Gradient Autofocus (PGA)CLC number:TN957.52
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A NEW CRITERION FOR OCCURRENCE OF STICK-SLIP MOTION IN DRIVE MECHANISM 被引量:2
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作者 丁文镜 樊世超 陆明万 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2000年第3期273-281,共9页
This paper, using Karnopp's model of friction force and phase plane method, studies the stick-slip motion of the flexible drive mechanism. It is explained that a sudden drop of friction force is the essential sour... This paper, using Karnopp's model of friction force and phase plane method, studies the stick-slip motion of the flexible drive mechanism. It is explained that a sudden drop of friction force is the essential source of stick-slip motion when the sliding is impending. A new criterion for occurrence of stick-slip motion is established. The stick-slip region and the stable region in a parameter plane are separated by a critical parameter curve. Moreover, for the stick-slip motion of the flexible drive mechanism without viscous damping, a parameter expression is obtained. The results may be used in design of the flexible drive mechanism. 展开更多
关键词 FRICTION phase plane stick-slip motion parameter criterion
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Averaging Analysis of Self-Excited Motion of a Quasi-Axisymmetrical Gyrostat
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作者 薛纭 陈立群 《Journal of Shanghai University(English Edition)》 CAS 2002年第2期125-129,共5页
The averaging analysis was carried out to study the motion of a quasi axisymmetrical gyrostat under a small magnitude self excited control torque. The common approach to investigating the problem of rigid body rot... The averaging analysis was carried out to study the motion of a quasi axisymmetrical gyrostat under a small magnitude self excited control torque. The common approach to investigating the problem of rigid body rotation under the action of a small torque known in the body frame was described. Using this approach, the problem (Grammel's problem for the case of small torque) that is maintaining the angular velocity of a quasi axisymmetrical gyrostat using a control torque quadratic in the angular velocity was solved. 展开更多
关键词 GYROSTAT self excited motion averaging method phase trajectories.
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基于太赫兹雷达的声致海面微动信号检测 被引量:2
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作者 邓彬 李韬 +3 位作者 汤斌 易俊 王宏强 杨琪 《雷达学报(中英文)》 EI CSCD 北大核心 2023年第4期817-831,共15页
水下声信号传播到水面时,由于水和空气的声阻抗差,会激发水表面横向微幅波,其振动信号包含了声源的相关信息。雷达通过目标回波间的相位差来检测目标的微小位移,因此可以利用雷达检测水面微小位移变化获取水面振动信号,进而反演水下声... 水下声信号传播到水面时,由于水和空气的声阻抗差,会激发水表面横向微幅波,其振动信号包含了声源的相关信息。雷达通过目标回波间的相位差来检测目标的微小位移,因此可以利用雷达检测水面微小位移变化获取水面振动信号,进而反演水下声源信息。该文首先分析了水下声传播的衰减特性及水面振动的物理模型,然后基于雷达回波模型对声致水面振动检测进行理论分析,提出了小波-卡尔曼滤波信号检测方法,最后在大型综合消声水池和黄海水域开展了基于太赫兹雷达的声致水面微动信号检测实验。实验结果表明所用太赫兹雷达能够检测声致水面的细微振动,所提算法能有效滤除水面干扰和雷达相位噪声并提取振动信号。实验首次在二级海况下检测到了亚微米级的振动信号,为水-空跨介质信息传输与水下航行器探测提供了依据。 展开更多
关键词 太赫兹雷达 声致水面 微动信号提取 相位测距 小波-卡尔曼滤波
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ON EQUATION OF DISCRETE SOLID PARTICLES' MOTION IN ARBITRARY FLOW FIELD AND ITS PROPERTIES 被引量:2
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作者 黄社华 李炜 程良骏 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2000年第3期297-310,共14页
The forces on rigid particles moving in relation to fluid having been studied and the equation of modifications of their expressions under different flow conditions discussed, a general form of equation for discrete p... The forces on rigid particles moving in relation to fluid having been studied and the equation of modifications of their expressions under different flow conditions discussed, a general form of equation for discrete particles' motion in arbitrary flow field is obtained. The mathematical features of the linear form of the equation are clarified and analytical solution of the linearized equation is gotten by means of Laplace transform. According to above theoretical results, the effects of particles' properties on its motion in several typical flow field are studied, with some meaningful conclusions being reached. 展开更多
关键词 solid liquid two phase flow discrete particles' motion equation discrete solid particles Laplace transform
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三效蒸发结晶系统管道设计和弯头防冲蚀研究
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作者 陈杰 张永祥 《炼油技术与工程》 CAS 2024年第10期52-56,共5页
在湿法烟气脱硫工艺蒸发结晶单元,管道内介质流动以液固两相流体为主,设备布置及管道设计不合理易造成固体颗粒析出沉积,对管道、弯头等存在一定的冲蚀磨损。从工程实际出发,系统梳理了某装置蒸发结晶系统主设备的平立面布置、管道设计... 在湿法烟气脱硫工艺蒸发结晶单元,管道内介质流动以液固两相流体为主,设备布置及管道设计不合理易造成固体颗粒析出沉积,对管道、弯头等存在一定的冲蚀磨损。从工程实际出发,系统梳理了某装置蒸发结晶系统主设备的平立面布置、管道设计,并采用流体流动模型(CFD),对影响装置长周期运行的不同曲率半径的弯头冲蚀情况进行模拟分析验证,研究管道内的流体速度场分布、压强分布、粒子运动轨迹和冲蚀速率分布图,证明使用3D、6D等曲率半径弯头,能有效减少流体中固体粒子对管道的冲蚀磨损,保证装置的长周期运行。 展开更多
关键词 三效蒸发结晶 管道设计 弯头防冲蚀 液固两相流 速度场 压力场 粒子运动轨迹 冲蚀速率
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A Novel Method with Martingale Theory for Phase Noise Analysis in Coherent Optical Communication
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作者 Chengle Sui Qiangmin Wang +1 位作者 Shilin Xiao Pingqing Li 《Optics and Photonics Journal》 2013年第2期171-174,共4页
Phase noise has a great influence on the performance of coherent optical communication. In this paper, martingale theory is introduced to analyze the phase noise effect for the first time as far as we know. Through Fu... Phase noise has a great influence on the performance of coherent optical communication. In this paper, martingale theory is introduced to analyze the phase noise effect for the first time as far as we know. Through Fubini’s Theory and martingale representation theory, we proved that , which denotes the phase noise effect, is a predictable martingale. Then Ito’s formula for solution to stochastic differential equation is utilized for the analysis of phase noise effect. Using our method, a nonrecursive formula for the moments of phase noise is derived and signal-noise-ratio (SNR) degradation in coherent optical OFDM due to phase noise is calculated with our method. 展开更多
关键词 MARTINGALE BROWNIAN motion Ito Itegral DERIVATION of MOMENTS phase Noise
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