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In the guidance and control of the first-stage recovery of rocket, the carrier pose measurement is very important. Inertial navigation, satellite navigation, LiDAR are usually used to measure the pose in engineering, while there is no precedent for visual measurement. Visual measurement has the advantages of no cumulative error and high update rate, and has the potential to be applied to rocket recovery. In this paper, the dynamics model of rocket recovery is analyzed and trajectory simulation is carried out, and the Falcon9 rocket is taken as the simulation object and the optimal trajectory is obtained by a convex optimization method. Four cameras were installed in the first stage of the rocket, and the visual pose measurement was realized through the multi-vision sensor measurement model, image target recognition and feature picking. The calculation results show that the visual measurement technology proposed in this paper has a high position accuracy and has the prospect of engineering application.

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在火箭一子级回收的制导控制中,载体位姿测量至关重要,工程上通常使用惯性导航、卫星导航、激光雷达等方式进行位姿测量,视觉测量具有无累计误差、更新率高等优点,有应用到火箭一子级回收制导控制的潜力。本文分析了火箭一子级垂直下落段的动力学模型,建立落点参考坐标系,以最小推进剂损耗为优化目标,进行垂直下落段的轨迹仿真,以猎鹰9号一子级为仿真对象,使用凸优化方法对基于最省推进剂问题进行求解,得到一子级垂直下落段最优轨迹。仿真算例将4台相机安装于火箭一子级,通过多视觉传感器测量模型、图像目标识别、图像特征拾取实现视觉位姿测量,计算的结果表明:本文提出的视觉测量技术具有较高的位姿精度,具备工程应用的前景。

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熊文祥 1994年生,硕士,工程师。

张沐松 1988年生,学士,工程师。

冯帅 1989年生,学士,工程师。

周佳 1998年生,硕士,助理工程师。

汪守利 1981年生,硕士,研究员。

李玥 1995年生,硕士,工程师。

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熊文祥 1994年生,硕士,工程师。

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周佳 1998年生,硕士,助理工程师。

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周佳 1998年生,硕士,助理工程师。

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STK在计算机仿真中的应用[M]. 北京: 国防工业出版社, 2005., articleTitle=null, refAbstract=null)], funds=[Fund(id=1239265693376508521, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239165055959355694, awardId=U22B2089, language=CN, fundingSource=国家自然科学基金联合基金重点项目(U22B2089), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1239265683758969025, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239165055959355694, xref=null, ext=[AuthorCompanyExt(id=1239265683767357633, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239165055959355694, companyId=1239265683758969025, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=Beijing Research Institute of Telemetry, Beijing 100094, China), AuthorCompanyExt(id=1239265683779940549, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239165055959355694, companyId=1239265683758969025, language=CN, 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journalId=1238841944844054536, articleId=1239165055959355694, language=EN, label=Fig. 13, caption=Relative error bar chart, figureFileSmall=423y2+z3ouIT3cuwpaxZ0A==, figureFileBig=Zum0qr5cDpUaQlG5cwJ6PQ==, tableContent=null), ArticleFig(id=1239265692403429946, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239165055959355694, language=CN, label=图13, caption=相对误差柱状图, figureFileSmall=423y2+z3ouIT3cuwpaxZ0A==, figureFileBig=Zum0qr5cDpUaQlG5cwJ6PQ==, tableContent=null), ArticleFig(id=1239265692516676159, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239165055959355694, language=EN, label=Table 1, caption=

First-stage structure parameter

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参数名称符号参数值
最大推力 Tmax/kN845.2
比冲 Ispg/S282
结构湿重 mwet/kg38 963
结构干重 mdry/kg27 215
), ArticleFig(id=1239265692596367937, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239165055959355694, language=CN, label=表1, caption=

一子级结构参数

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参数名称符号参数值
最大推力 Tmax/kN845.2
比冲 Ispg/S282
结构湿重 mwet/kg38 963
结构干重 mdry/kg27 215
), ArticleFig(id=1239265692697031240, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239165055959355694, language=EN, label=Table 2, caption=

First-stage constraint parameter

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参数名称符号参数值
初始位置 r0/m(9 600, 600, 1 500)
初始速度 v0/(m/s)(-350 542)
末端位置 r f/m(0,0,0)
末端速度 v f/(m/s)(0,0,0)
), ArticleFig(id=1239265692772528713, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239165055959355694, language=CN, label=表2, caption=

一子级垂直段约束参数

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参数名称符号参数值
初始位置 r0/m(9 600, 600, 1 500)
初始速度 v0/(m/s)(-350 542)
末端位置 r f/m(0,0,0)
末端速度 v f/(m/s)(0,0,0)
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Position resolution accuracy

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点位测量值(m)距离真值(m)相对测量误差(%)
1239.25238.450.34%
2206.49205.900.29%
3174.42174.000.24%
4152.52152.800.18%
5133.75133.950.15%
6110.26110.050.19%
772.2372.300.10%
855.6755.600.13%
942.6942.500.45%
1030.6530.400.82%
), ArticleFig(id=1239265692990632535, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239165055959355694, language=CN, label=表3, caption=

位置解算精度

, figureFileSmall=null, figureFileBig=null, tableContent=
点位测量值(m)距离真值(m)相对测量误差(%)
1239.25238.450.34%
2206.49205.900.29%
3174.42174.000.24%
4152.52152.800.18%
5133.75133.950.15%
6110.26110.050.19%
772.2372.300.10%
855.6755.600.13%
942.6942.500.45%
1030.6530.400.82%
), ArticleFig(id=1239265693091295834, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239165055959355694, language=EN, label=Table 4, caption=

Attitude resolution accuracy

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距离(m)eul_xeul_yeul_zeul_n
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1001.432°1.268°1.192°2.253 7°
500.146°0.170°0.221°0.314 7°
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姿态解算精度

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火箭一子级回收的垂直下落段视觉测量技术
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熊文祥 , 张沐松 , 冯帅 , 周佳 , 汪守利 , 李玥
遥测遥控 | MEMS与传感器 2025,46(5): 151-158
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遥测遥控 | MEMS与传感器 2025, 46(5): 151-158
火箭一子级回收的垂直下落段视觉测量技术
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熊文祥, 张沐松, 冯帅, 周佳, 汪守利, 李玥
作者信息
  • 北京遥测技术研究所 北京 100094
  • 熊文祥 1994年生,硕士,工程师。

    张沐松 1988年生,学士,工程师。

    冯帅 1989年生,学士,工程师。

    周佳 1998年生,硕士,助理工程师。

    汪守利 1981年生,硕士,研究员。

    李玥 1995年生,硕士,工程师。

Visual Measurement Technique for The Vertical Fall Section of The First-Stage Recovery of Rocket
Wenxiang XIONG, Musong ZHANG, Shuai FENG, Jia ZHOU, Shouli WANG, Yue LI
Affiliations
  • Beijing Research Institute of Telemetry, Beijing 100094, China
出版时间: 2025-09-15 doi: 10.12347/j.ycyk.20250329001
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在火箭一子级回收的制导控制中,载体位姿测量至关重要,工程上通常使用惯性导航、卫星导航、激光雷达等方式进行位姿测量,视觉测量具有无累计误差、更新率高等优点,有应用到火箭一子级回收制导控制的潜力。本文分析了火箭一子级垂直下落段的动力学模型,建立落点参考坐标系,以最小推进剂损耗为优化目标,进行垂直下落段的轨迹仿真,以猎鹰9号一子级为仿真对象,使用凸优化方法对基于最省推进剂问题进行求解,得到一子级垂直下落段最优轨迹。仿真算例将4台相机安装于火箭一子级,通过多视觉传感器测量模型、图像目标识别、图像特征拾取实现视觉位姿测量,计算的结果表明:本文提出的视觉测量技术具有较高的位姿精度,具备工程应用的前景。

视觉测量  /  多视觉传感器测量  /  动力学模型  /  火箭回收  /  位资测量

In the guidance and control of the first-stage recovery of rocket, the carrier pose measurement is very important. Inertial navigation, satellite navigation, LiDAR are usually used to measure the pose in engineering, while there is no precedent for visual measurement. Visual measurement has the advantages of no cumulative error and high update rate, and has the potential to be applied to rocket recovery. In this paper, the dynamics model of rocket recovery is analyzed and trajectory simulation is carried out, and the Falcon9 rocket is taken as the simulation object and the optimal trajectory is obtained by a convex optimization method. Four cameras were installed in the first stage of the rocket, and the visual pose measurement was realized through the multi-vision sensor measurement model, image target recognition and feature picking. The calculation results show that the visual measurement technology proposed in this paper has a high position accuracy and has the prospect of engineering application.

Visual measurement  /  Multi-vision sensor measurement model  /  Dynamical model  /  Recovery of rocket  /  Visual pose measurement
熊文祥, 张沐松, 冯帅, 周佳, 汪守利, 李玥. 火箭一子级回收的垂直下落段视觉测量技术. 遥测遥控, 2025 , 46 (5) : 151 -158 . DOI: 10.12347/j.ycyk.20250329001
Wenxiang XIONG, Musong ZHANG, Shuai FENG, Jia ZHOU, Shouli WANG, Yue LI. Visual Measurement Technique for The Vertical Fall Section of The First-Stage Recovery of Rocket[J]. Journal of Telemetry, Tracking and Command, 2025 , 46 (5) : 151 -158 . DOI: 10.12347/j.ycyk.20250329001
传统的一次性运载火箭发射成本高昂、发射周期长,无法满足人类探索开发太空的需求。可重复使用运载器通过回收和重复使用火箭一子级等关键部件,显著降低发射成本的同时能够大大缩短发射周期,是新一代航天运载系统的重要发展方向。其中垂直起降方案凭借其基于传统火箭架构,技术改进幅度小,对着陆场地需求低、复用成本较低等特点成为近年来航天领域的研究热点。目前Blue Origin和Space-X两家商业航天公司都已采用垂直回收方式实现了运载火箭—子级回收。
运载火箭一子级回收的返回任务通常由调姿段、减速转弯段、滑行段、动力减速段、气动减速段和垂直下降段六部分组成[1],垂直下落段作为飞行末段,对位姿精度的要求较高。文献[2]通过建立垂直软着陆火箭的动力学模型、使用蒙特卡罗仿真、建立非线性姿态控制模型,对垂直起降火箭末段定点着陆的制导方法进行了研究,但文中所用四项式制导方法对火箭垂直着陆时的横向初始位置、速度的要求较为苛刻,没有完全利用火箭的机动性。文献[3]针对火箭高空再入定点回收,基于凸优化方法提出一种考虑气动力和推力控制的多阶段轨迹优化方法,经过少量的逐次凸化迭代,可快速收敛到最优解。文献[4]研究了基于垂直着陆段“惯性+多模式无线电+微波测距测速”的组合导航体系。文献[5]分析表明“高精度绝对+相对组合导航方案”是运载火箭一子级垂直返回海上定点平台导航问题的最佳途径。文献[6]提出RTK(Real-Time Kinematic,实时动态定位技术)组合定位系统、微波雷达高度计修正光纤捷联惯导累计误差的多源信息融合方法,并进行了半实物吊装试验,工程应用性较强。文献[7]介绍了可重复使用飞行器的技术发展并对火箭自主返场的导航系统方法进行了研究。文献[8]采用红外图像和可见光图像协同的方式,提出一种基于机器视觉的无人机自主着陆算法。文献[9]提出一种双目视觉惯导SLAM(Simultaneous Localization and Mapping,同步定位与地图构建)技术,误差低于3%。文献[10]提出基于CNN(Convolutional Neural Network)-LSTM(Long Short Term Memory)神经网络的前视成像算法,有效提高了成像分辨率。文献[11-12]研究了基于直接法中的伪谱法和采样反馈技术提出了滚动时域在线轨迹优化制导法。文献[13-14]将多变量伪谱差值方法与子空间选择算法相结合,提出基于离线最优轨迹数据库在线生成近似最优参考轨迹的方法。文献[15]对基于单目视觉的火箭回收高度测量技术进行了研究,针对回收过程中的烟雾场景提升了去雾算法对不同雾环境的适应性,针对靶点特性提出了一种适用于靶点特征提取的算法,并设计实验验证了算法的可行性与可靠性,在工程应用中具有参考意义。工程上通常使用惯性导航、卫星导航、激光雷达等方式进行位姿测量,相较于上述方式视觉测量具有无累计误差、更新率高等优点,有应用到火箭回收的潜力。
本文分析了火箭一子级垂直下落段的动力学模型,进行垂直下落段的轨迹仿真,以4台相机安装于火箭一子级建立多视觉传感器测量模型,进行视觉位姿测量,计算的结果表明:本文提出的视觉测量技术具有较高的位姿精度,具备工程应用的前景,为火箭一子级回收的垂直下落段位姿测量与导航提供一种有效的方法。
动力垂直下降段工作时间较短,忽略地球曲率和地形,建立落点参考坐标系,rx垂直于落点当地水平面,ryrz在落点当地面内,与rx构成笛卡尔坐标系,ry方向根据回收任务进行选择。落点参考坐标系示意见图1,忽略气动力,着陆段的动力学方程为[16]
式中,r(t)为位置矢量;v(t)为速度矢量;m(t)为一子级火箭质量;g(t)为引力加速度矢量;T(t)为火箭的推力矢量;Ispg为发动机比冲。
根据飞行剩余质量公式:
式中α=1/Ispg,垂直下降段最省燃料控制优化问题目标函数为:
推力约束表示为:
式中,Tmin为最小推力,Tmax为最大推力,着陆点位置约束:
式中,ϕ(t)为t时刻的俯仰角,ϕmin为最小俯仰角,质量约束可表示为:
式中,mwet为火箭含推进剂质量,mdry为无推进剂的一子级空重,终端约束表示为:
采用多组视觉传感器建立视觉模型,视觉算法流程见图2,主要包括多视觉传感器测量模型、图像目标识别、图像特征提取、视觉位姿测量。
具体步骤为采用4组视觉传感器获取目标区域特征图像,因此首先建立多视觉传感器的测量数学模型并完成相关参数标定,为后续计算提供视觉参数基础。在此基础上,可开展连续的图像采集与处理工作,依次包括图像目标识别与分割技术,在大画幅视场中精准定位目标区域位置,并分割区域特征;而后使用图像特征提取技术,获取目标区域中的几何特征数据,包括圆环特征和角点特征两种特征;最后,基于提取得到的特征完成位姿的计算。
本方案涉及对回收区域的识别以及图案的分割,因此需要研发针对下落区域的图像识别与分割技术。本方案拟研发基于深度学习的目标识别分割方法,构建单阶段的端到端目标识别分割网络,以高准确性、高实时性和灵活性实现目标的识别与分割。
本方案构建的目标检测网络架构可以分为4个部分:输入端、骨干网络、颈部和检测头,网络整体采用轻量级设计,使其适用于载体嵌入式计算环境。
目标识别与分割网络的损失函数拟采用Task-Aligned Assigner(任务分配)策略,如式(8)所示,将分类和回归所得到的结果进行加权融合来判定样本的正负,
其中,s是标注类别对应的预测分值,u是预测框和真实框的交并比,两者相乘就可以衡量对齐程度。同时,网络输出少了置信度分支,只有分类分支和回归分支,分类损失使用的是BCE(二元交叉熵)损失函数,而在回归分支中使用CIOU(完全交并比)损失和DFL(分布焦点)损失函数。
本方案采用的多视觉传感单元构成传感系统,每组视觉传感单元包括1 台可见光相机,不同视觉传感器之间可建立如式(9)所示的多视觉传感模型:
公式表示了相机图像信息与真实三维坐标的关系,其中,p1p2p3p4分别为空间点在相机坐标系的图像坐标,q为空间点在世界坐标系中的三维坐标,对于火箭一子级回收的应用场景,光学系统的世界坐标系使用落点参考坐标系,M1M2M3M4是4个相机的投影矩阵。
公式(9)描述了4组单目视觉传感单元成像模型[17],视觉测量首先对空间坐标系的转换关系进行解算,主要涉及世界坐标系、相机坐标系和图像坐标系,利用特征信息可以将位姿测量问题转换为物空间到像空间的3D-2D坐标转换问题[18]
相机坐标系是以相机光心为原点的三维坐标系,图像坐标系是以像主点为原点的二维坐标系,世界坐标系使用落点参考坐标系,特征点坐标在相机坐标系到图像坐标系的转换关系可以借助相机内参数建立:
其中,s是比例系数,p=[u v 1]T是2D投影点在图像坐标系下的齐次坐标;矩阵K为相机内参,矩阵K中(fx  fy)分别是水平和垂直方向的有效焦距,(Cx  Cy)为相机主点坐标,矩阵K可通过标定求得;L=[x y z 1]T=[q|1]T是3D参考点在世界坐标系下的齐次坐标;M=K[R|t],R、t分别为世界坐标系到相机坐标系的旋转矩阵和平移矢量,用于表示姿态及位置,因此可通过像素位置及相机内参得到空间点的位姿信息[7]
式(10)转换为:
展开为:
消去s可得:
转换为矩阵形式:
由推导可知,一对3D-2D点对提供两个方程。当点对数n≥6时,可求解出旋转矩阵和平移矩阵,即得到火箭一子级的姿态和位置参数。
对于圆形标志,根据透视投影变换原理,可以使用图像坐标系的变换求得载体位姿,采用基于Hough变换的椭圆轮廓检测算法进行标志特征读取[19]。Hough变换的思想是通过统计参数空间中每一点的穿越直线数检测出图像空间中的直线。通过遍历二维平面上的每一点,计算与边缘图上点的距离,得到每一点距离边缘的最大距离,所有点中最大距离最小的点就是椭圆中心,将数据点代入即可得到椭圆方程[20]
对于角点检测,基于Harris(检测算法)角点数学模型,核心思想是利用局部窗口在图像上进行移动,判断灰度是否发生较大的变化[21]。如果窗口内的灰度值(在梯度图上)都有较大的变化,那么这个窗口所在区域就存在角点。
仿真算例以Falcon9(猎鹰9号)发射近地圆轨道任务,一子级回收为场景。火箭气动减速段结束时刻的位置、速度、质量作为着陆段制导状态量初始条件,火箭结构参数选择Falcon9一子级参数见表1,推力上限为单台Merlin-1D发动机满推力Tmax,下限为0 N,约束参数见表2,着陆点参数设置为末端参数。
一子级回收垂直下落段的飞行轨迹见图3。火箭的初始位置为(9 600, 600, 1 500)m,末端位置为(0,0,0)m,飞行横向机动远小于高度,整体飞行轨迹较为平滑。一子级垂直下落段的位置图见图4,飞行高度方向x方向的变化率最大,尤其是在距离地面较高的下落段前25 s,y方向的位置变化接近线性,能降低控制系统的复杂性。
一子级垂直下落段的速度曲线见图5,平行于当地水平面的y方向和z方向速度较小,其中y方向速度相对y轴速度为负值,z方向速度由正转负再降为0,x方向速度则是先减小,再增加,经过不断变化,最终降为0,这是因为在回收时速度根据引力和推力的不断变化逐步调整为0。
一子级垂直下落段的高度曲线见图6,质量变化见图7。从整个曲线趋势来看,高度变化与质量变化非常接近,说明主要推进剂损耗用在降低速度上,方向和姿态调整使用的推进剂比例较低。在着陆瞬间仅有垂直方向加速度ax,符合垂直回收的力学要求,飞行末端速度降为0,达到回收软着陆的最终目的。终点时刻的一子级质量接近结构空重,推进剂利用率较高。
火箭一子级垂直下落段发动机推力曲线见图8,发动机推力满足幅值约束,推力形式为典型的Bang-Bang控制,符合推力最优控制的规律[22],由此获得以最小推进剂损耗为优化目标的垂直返回段轨迹。
火箭一子级仿真模型如图9所示,获得飞行轨迹后,将光学传感器安置于火箭一子级,进行光学测量。光学相机按照YPR(姿态角)方式相对火箭本体坐标系进行旋转[24],设置四个相机沿火箭外壁轴向等角度布置,轴向位置位于一子级级间段下侧。相机共4个,其中相机1的视场范围与时间的关系如图10所示。
火箭安装的可见光相机通过对合作信标进行识别和特征点拾取,从而进行位姿解算。合作信标采用三个圆环,内嵌十字形图案,通过图案与背景的高对比度成像,信标特征点拾取见图11
用缩比的模型进行视觉位姿解算,使用高精度激光测距仪进行10个点位的等效距离测量。使用相机记录测量的图案,用位姿算法进行求解。测量的数据值见图12~图13,解算精度见表3,可以看出,在选取的10个点位中,整体的相对测量误差在距离72.30 m处最小,当距离增加时,由于图像清晰度降低,成像质量下降,会影响测量精度,随着距离减小,由于定焦距离原因,也会出现测量精度降低。当前的相机硬件设置和软件算法对50~150 m能获得较好的精度。
姿态计算的基准点使用高精度全站仪标记,使用图像进行位姿解算进行对比[24]。其中 eul_代表某轴欧拉角;xyz分别代表各轴;n代表三轴2范数
姿态解算数据见表4,可以看出,对于同一个位置,三个欧拉角的误差差异不大,对于三个位置,距离越近,则仿真算例的姿态精度越高,对于垂直下落段三维导航辅助具有工程应用价值。
本文通过分析火箭一子级回收的基本力学关系,建立火箭位置约束、质量约束、推力约束等的优化模型,结合凸优化方法,进行轨迹仿真。在一子级回收中引入光学测量方法,采用多视觉传感器模型,按照目标识别、图像特征提取、进行视觉位姿计算,从而实现火箭一子级回收的垂直下落段仿真。通过仿真计算,火箭满足各项约束条件,终端速度、位置精度较高。使用视觉位姿算法计算10组数据,最高精度可以达到0.10%,在火箭降落的距地50~150 m具有较好的使用效果。
  • 国家自然科学基金联合基金重点项目(U22B2089)
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doi: 10.12347/j.ycyk.20250329001
  • 接收时间:2025-03-29
  • 首发时间:2026-03-13
  • 出版时间:2025-09-15
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  • 收稿日期:2025-03-29
  • 修回日期:2025-05-17
基金
国家自然科学基金联合基金重点项目(U22B2089)
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    北京遥测技术研究所 北京 100094
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2种不同金属材料的力学参数

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种数
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占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
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Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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