From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 1397/CH3/EX3.1/3_1.sce |  7 +++++++
 1397/CH3/EX3.2/3_2.sce | 31 +++++++++++++++++++++++++++++++
 1397/CH3/EX3.3/3_3.sce |  8 ++++++++
 1397/CH3/EX3.4/3_4.sce | 11 +++++++++++
 1397/CH3/EX3.5/3_5.sce | 13 +++++++++++++
 5 files changed, 70 insertions(+)
 create mode 100755 1397/CH3/EX3.1/3_1.sce
 create mode 100755 1397/CH3/EX3.2/3_2.sce
 create mode 100755 1397/CH3/EX3.3/3_3.sce
 create mode 100755 1397/CH3/EX3.4/3_4.sce
 create mode 100755 1397/CH3/EX3.5/3_5.sce

(limited to '1397/CH3')

diff --git a/1397/CH3/EX3.1/3_1.sce b/1397/CH3/EX3.1/3_1.sce
new file mode 100755
index 000000000..610a1398f
--- /dev/null
+++ b/1397/CH3/EX3.1/3_1.sce
@@ -0,0 +1,7 @@
+//clc();
+clear;
+//To determine the total absorption in the hall
+V=7500;              //Volume of cinema hall in m^3
+T=1.5;               //Reverberation time in seconds
+A=(0.165*V)/T;
+printf("total absorption in hall is %f O.W.U or Sabine",A);
diff --git a/1397/CH3/EX3.2/3_2.sce b/1397/CH3/EX3.2/3_2.sce
new file mode 100755
index 000000000..70f56a1de
--- /dev/null
+++ b/1397/CH3/EX3.2/3_2.sce
@@ -0,0 +1,31 @@
+//clc();
+clear;
+//To determine reverberation time of hall
+V=1500;              //Volume of hall in m^3
+S=120;               //Seating capacity
+S1=112;              //Area of plastered wall in m^2
+C1=0.03;             //Coefficient of absorption of plastered wall in O.W.U
+S2=130;              //Area of wooden floor in m^2
+C2=0.06;             //Coefficient of absorption of wooden floor in O.W.U
+S3=20;               //Area of wooden door in m^2
+C3=0.06;             //Coefficient of absorption of wooden door in O.W.U
+S4=170;              //Area of plastered ceiling in m^2
+C4=0.04;             //Coefficient of absorption of plastered ceiling in O.W.U
+S5=100;              //Area of cushioned chairs in m^2
+C5=1.0;              //Coefficient of absorption of cushioned chairs in O.W.U
+S6=120;              //Area of audience in m^2
+C6=4.7;              //Coefficient of absorption of audience in O.W.U
+A1=S1*C1;            //Absorption due to plastered wall
+A2=S2*C2;            //Absorption due to wooden floor
+A3=S3*C3;            //Absorption due to wooden door
+A4=S4*C4;            //Absorption due to plastered ceiling
+A5=S5*C5;            //Absorption due to cushioned chairs
+A6=S6*C6;            //Absorption due to 120 persons
+A=A1+A2+A3+A4+A5;
+T1=(0.165*V)/A;
+printf("Reverberation time when hall is empty is %f sec",T1);
+T2=(0.165*V)/(A6+A);
+printf("Reverberation time when hall is with full capacity of audience is %f sec",T2);
+A7=100*C6;          //Absorption due to 100 persons
+T3=(0.165*V)/(A7+A);
+printf("Reverberation time when hall is with audience occupying only cushioned seats is %f sec",T3);
diff --git a/1397/CH3/EX3.3/3_3.sce b/1397/CH3/EX3.3/3_3.sce
new file mode 100755
index 000000000..27afaebda
--- /dev/null
+++ b/1397/CH3/EX3.3/3_3.sce
@@ -0,0 +1,8 @@
+//clc();
+clear;
+//To determine average absorbing power of surfaces
+V=120000;        //Volume of hall in m^3
+T=1.5;           //Reverberation time in sec
+S=25000;         //Total sound absorbing surface in m^2
+a=(0.165*V)/(T*S);
+printf("average absorbing power of surface is %f O.W.U or sabine",a);
diff --git a/1397/CH3/EX3.4/3_4.sce b/1397/CH3/EX3.4/3_4.sce
new file mode 100755
index 000000000..3bed18cfc
--- /dev/null
+++ b/1397/CH3/EX3.4/3_4.sce
@@ -0,0 +1,11 @@
+//clc();
+clear;
+//To determine the effect on reverberation time
+V=2265;         //volume of hall in m^3
+A=92.9;         //Total absorption in m^2
+T1=(0.165*V)/A;
+//when one audien fill the hall then total absorption will be 2*A
+T2=(0.165*V)/(2*A);
+printf("T1=%f sec",T1);
+printf("when one audien fill the hall then total absorption is %f sec",T2);
+printf("thus reverberation time is reduced to one-half of its initial value");
diff --git a/1397/CH3/EX3.5/3_5.sce b/1397/CH3/EX3.5/3_5.sce
new file mode 100755
index 000000000..1cba6e8a9
--- /dev/null
+++ b/1397/CH3/EX3.5/3_5.sce
@@ -0,0 +1,13 @@
+//clc();
+clear;
+//To determine reverberation time of the hall
+V=1000;            //volume of hall in m^3
+A1=400;            //area of wall in m^2
+A2=100;            //area of floor in m^2
+A3=100;            //area of ceiling in m^2
+N=0.02;            //number of cushion chairs of wall 
+a1=0.01;           //absorption coefficient of ceiling
+a2=0.05;           //absorption coefficient of floor
+a3=1.0;            //absorption coefficient of each cushion chair
+T=(0.165*V)/((A1*N)+(A2*a1)+(A2*a2)+(A3*a3))
+printf("reverberation time of the hall is %f sec",T);
-- 
cgit