• 2022-07-29
    矩形闸门高[tex=2.714x1.0]gyBHUsuj6RzckBHLYLVYWFFFor7eLtSvNuHmBgkklf8=[/tex], 宽 [tex=2.714x1.0]BvPq/EBHQkvra0tZYcU3q9xbB2ef+mn+IAIuMMSFpOg=[/tex], 上游水深[tex=4.071x1.214]TKFD1pmJRxmImxfmVNqAjEOP6KqmcVyxQlbATgPFL3Xq1yyA0ICrlZ7H4Nklo43k[/tex], 下游水深[tex=3.857x1.214]AFuNscC5HD0IY9HCnMxfqgArEtQ6Y5WR3v87IG7Z/xs=[/tex], 试求: (1)作用在闸门上的静水总压力;(2) 压力中心的位置。[img=398x304]17ae0c7d1819e02.png[/img]
  • 解:(1)图解法。压强分布如图所示:[img=347x291]17ae0c825e3e0f4.png[/img][tex=17.143x7.357]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[/tex]合力作用位置:在闸门的几何中心,即距地面[tex=5.0x2.786]bq0NW+kvXJK/sNlirSWikAzpY0PPHecDmgpwJiSbawxM0AXrzf6FPeKELUMMqWUJSghKpj40zSaXdFwNAQ/Q8w==[/tex]处(2)解析法。[tex=27.643x1.357]o2BNvq5zeXruD83knO1BNPy1wLBZFGpDQrItqsH9QTWLw5u2OisBICLMvssCBXeZSxfixlqFwu9eM+N0tp7eQ3ksp7E++NRvJ9FoeGTrhaviQ0Ojloq4h18NSoYzHlj1qkapsuvl6RCSIiJ0cxoBDg==[/tex][tex=25.643x10.071]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[/tex]合力: [tex=9.929x1.357]9orp2/roV+HoR3fxeccnVOFFfsKp565v8siK6dRRaoMu8m3qREEwuLVqj1jnrw45Q370O+WT02DBsgRIxrLqHg==[/tex]合力作用位置(对闸门与渠底接触点取矩)[tex=13.643x1.357]H703GkVzlkwVHgnFhYLdVadF5+cvwg8GmkHAsnw6AG25h3T2c/CidYz8HK83jCFRAJiMxX4k05RetW8YA32f9MbjMYl/LjmPw3zOepUvYatgMXwtHv3fzy898dpE5UTBHHXTBqVEjmG9Jfk6gwEptHgd5jzykqAuGetX4Qd8WYdIt3F3F9YsGc1sGibiCcLiqNyyevKGWD1xLTrPAb5t0NHcGsi4LkrPN41zT4ePE9Q=[/tex][tex=21.071x7.071]ifE9NWj3X6IpRVSt3T5ITgG/Pqh0gdIC2nVWW6LBnHmZqiVCrpyaHZm5OOQUvh0uqurk6iK73t7EF4/X+1BpRqgFyXSktGbGKbOL5kyUjNDP9877balwxDPihYxsBzvwIF8BSg+Puf2dImgjzqyWijRD33RwcaxEb+3Ue+xydgvCJCqhOOExeDVtlpjuObTTzJY4s6Q+jGyutVDxW4fqhVaoBCtbCv4fEkpDbF6UEP8N00TxNHhXE1cjdV6jUpPMse60WEcEuyR1RNdnCPSNTqsnwchg1pA3+JRM4CbHmQCIubfQhrw7MZzrcJKcMfMcCVZ7Nop6SZlikxMyItIBuAs47w6Y/hBYy3lQsd3ChzFEdq7Ipr6pxSbstP2Qkylv3eoliUvMKoE8+Tf3QOX7iIWTM2JspemGkdlPUIhXKt73gWysnQk3crOpyGjYGBfW[/tex]答: (1) 作用在闸门上的静水总压力 [tex=4.357x1.214]XkXiTwutwglwKlnmflErqtunVNkSHIljvAIGBJItGzA=[/tex] (2) 压力中心的位置在闸门的几何中心, 即距地面 [tex=5.0x2.786]bq0NW+kvXJK/sNlirSWikAzpY0PPHecDmgpwJiSbawxM0AXrzf6FPeKELUMMqWUJSghKpj40zSaXdFwNAQ/Q8w==[/tex]处.

    内容

    • 0

      采用基2时间抽取FFT算法流图计算8点序列的DFT,第一级的数据顺序为 A: x[0],x[2],x[4],x[6],x[1],x[3],x[5],x[7] B: x[0],x[1],x[2],x[3],x[4],x[5],x[6],x[7] C: x[0],x[4],x[2],x[6],x[1],x[5],x[3],x[7] D: x[0],x[2],x[1],x[3],x[4],x[6],x[5],x[7]

    • 1

      采用基2频率抽取FFT算法计算点序列的DFT,以下()流图是对的。 A: x[0],x[1],x[2],x[3],x[4],x[5],x[6],x[7] B: x[0],x[2],x[4],x[6],x[1],x[3],x[5],x[7] C: x[0],x[2],x[1],x[3],x[4],x[6],x[5],x[7] D: x[0],x[4],x[2],x[6],x[1],x[5],x[3],x[7]

    • 2

      下列哪条语句是正确的( ) A: A=[1 2;3 4];B=[3;7];A.*B; B: A=cell(2,3);A(1,2)=[4;5]; C: A=[2 3 5 7;9 4 6 1;7 3 2 5];B=[1 7;0 5];A(2:end,2:2:end) D: x=-5:5;y=-5:5;z=x.*x-y.*y;surf(x,y,z);

    • 3

      【计算题】5 ×8= 6×4= 7×7= 9×5= 2×3= 9 ×2= 8×9= 7×8= 5×5= 4×3= 5+8= 6 ×6= 3×7= 4×8= 9×3= 1 ×2= 9×9= 6×8= 8×0= 4×7=

    • 4

      下面是图的拓扑排序的是?(多选)[img=340x240]1802faef6ebcc2a.png[/img] A: 2 8 0 7 1 3 5 6 4 9 10 11 12 B: 2 8 7 0 6 9 11 12 10 1 3 5 4 C: 8 2 7 3 0 6 1 5 4 9 10 11 12 D: 8 2 7 0 6 9 10 11 12 1 3 5 4