Abstract

The acceleration of propulsion may decrease the blades gravity decreases. This acceleration increases from 8m/s2 to 220m/s2 when the blade gravity increase from 370kg to 570kg at conditions of the blades radius 37mˎrotational speed 3,300r/m & helicopter 30tons. On the other side, with increasing inclinations from 4º to 13º it may increase too. The adjacent acceleration with these inclinations will attain near 2m/s2 and 10m/s2 at the same two conditions. The flitting speed may be proportional to increasing time when it increase from 310km/s to 350m/s with decreasing number of blades from 8 to 6. With increasing the inclinations it will increase at the angle f=4º.

Keywords: Acceleration of propulsion; Flitting speed; Helicopter; Multiple blades; Time; Six to eight blades; Heavy helicopter; Angle f=4º.

Introduction

In helicopter design the multiple blades has become prevail currently so the acceleration of propulsion will get important from six to eight blades for heavy loads. The multiple blades helicopter may transport ate more people and freight to destination rapidly and securely. Its role gets more important on current. Not only in industry but also in military it can play an important role on executing tasks like attacking and defending enemy. Therefore it may be made more quantities to satisfy the demand. The design department will get important for heavy helicopter. The properties will become significant like acceleration of propulsion because of they are key technological parameters that may influence the flight property. As for the parameters the acceleration of propulsion has dominated on main position. In this paper the detailed acceleration with time has been computed and discussed in order to know its properties distribution with all kinds of respects. They include in the blade radius helicopter gravityˎ blades gravity & blades revolutions. According to these parameters the modelling can be built for analyzing their roles respectively. To satisfy the heavy load function we adopt from six to eight blades to promote its freight capacity. At the same time, the analysis may be proceeded according to its properties. Overall, this paper shows that the acceleration of propulsion is computed in terms of theoretical dynamics to use in this research. It is supposed that from six to eight blades it exists in. For finding the intrinsic relationship between parameters the dynamics has been established and charted so as to get convenient to analyses them. To promote the property of heavy helicopter from six to eight blades of helicopter through establishing corresponded models for estimating their respective functions is our destination [1-29].

Modelling and Equation

The modelling and simulation between the acceleration and a part of speed of propulsion and time is established and the results is investigated as below with different parameters from six to eight blades in heavy helicopter at the angle f =4º. Three conditions of inclinationq, blade radius Rˎ helicopter gravity M and rotational speed n etc. as corresponding parameters to compute for helicopter’s blade and total helicopter. It gains twelve groups of values to estimate these properties. In this paper all the relational parameters have been calculated on the helicopter and blades. It is tried out that finding intrinsic relationships between them happens in helicopter flight in order to simulate the situations and change conditions. The acceleration and a part of acceleration and time has been searched in here according to different inclination q,  blades gravity m & blade radius R etc. in helicopter while the accelerationˎ gravity and time is in research of the rotational speed of blades and radius of helicopter blades with various inclinations and parameters like blades and helicopter gravity. The main task has grasped the propulsion of acceleration and a part of speed with the time. The other parameters like blade inclination qˎ helicopter gravity Mˎ blade radius R & rotational speed n are used to proceed as well. Meantime, the number of blades has chosen 6~8 to model for analysing the properties in this paper to optimize these parameters in design and innovative teams. The detail modelling process has been known to the previous paper. The detail discussions are shown as below.

  • R=37m; n=3,300r/m; m1=370kg; M=30tons; number=6
  1. R=37m; n=3,300r/m; m1=570kg; M=30tons; number=6
  2. R=17m; n=3,300r/m; m1=270kg; M=30tons; number=7
  3. R=27m; n=3,300r/m; m1=370kg; M=30tons; number=6
  4. R=17m; n=1,400r/m; m1=170kg; M=20tons; number=6
  5. R=17m; n=1,400r/m; m1=220kg; M=20tons; number=7
  6. R=17m; n=3,300r/m; m1=170kg; M=30tons; number=8
  7. R=17m; n=3,300r/m; m1=270kg; M=30tons; number=8
  8. R=17m; n=1,400r/m; m1=270kg; M=30tons; number=7
  9. R=17m; n=2,400r/m; m1=270kg; M=30tons; number=7
  10. R=17m; n=2,400r/m; m1=270kg; M=30tons; number=8
  11. R=20m; n=2,400r/m; m1=270kg; M=30tons; number=8

Figure 1: The relationship of acceleration of propulsion and time with various angle q= 4º, 7º, 10º &13º with defined angle f=4º, rotation speed n=1,400r/m~3,300r/m and radius R=17m~37m in blade of number of six ~eight blades helicopter (helicopter gravity 20tons~30tons &blade 170kg~570kg).

The acceleration of propulsion may decrease the rotational speedˎ blades radiusˎ blade gravity & angle f decreases as shown in Figure 1(a ~l). In details the acceleration increases from 140m/s2 to 220m/s2 when the blade gravity increase from 370kg to 570kg at the conditions as shown in Figure 1(a &b). On the other side, with increasing inclination from 4º to 13º it may increase from 50m/s2 to 220m/s2 too for example in Fgire 1(b). The adjacent acceleration with inclinations will attain near 40m/s2 and 10m/s2 according to Figure 1(a) and (c) respectively at the angle f =4º.

  • R=20m; n=2,400r/m; m1=270kg; M=30tons; number=8
  • R=17m; n=2,400r/m; m1=270kg; M=30tons; number=8
  • R=17m; n=2,400r/m; m1=270kg; M=30tons; number=7
  • R=6.7m; n=2,480r/m; m1=130kg; M=35tons; number=7

Figure 2: The relationship of flitting speed and time with various angle q= 4º, 7º, 10º &13º with defined angle f=4º, rotation speed n=2,400r/m and radius R=6.7m~20m in blade of number of six ~eight blades helicopter (helicopter gravity 30tons~35tons &blade 130kg~270kg).

Figure 1(a ~i) shows that the acceleration of propulsion becomes horizontal line with time in one blade at the parameters condition of total helicopter gravity 20tons~30tons and blade gravity 170kg~270kg at the anglef =4º. It may reach the biggest one with 220m/s2 in Figure 1(b). The value will decrease to 8m/s2 in Figure 1(e) because the rotational speed decreases to 1,400r/m regardless of the time. With increasing the inclinations the acceleration of propulsion may increase adjacently from 10m/s2 to 2m/s2 while the maximum acceleration attains from 38m/s2 to 7.3m/s2 from Figure 1(h) to Figure 1(i) respectively. On the other side, it can decrease as the total helicopter gravity increases, meantime it can increase as the blades gravity increases. In Figure 1(j &k) the acceleration of propulsion may get to decrease from 22m/s2 to 18m/s2 regardless of increasing the time with increasing number of blades from 7 to 8. In Figure 2(a~e) the flitting speed may be proportional to increasing time. When the time increases it may increase from 310m/s to 350m/s with decreasing number of blades from 8 to 6 as shown in Figure 2(a &d). With increasing the inclination the flitting speed will increase. The adjacent one may attain from 70m/s to 80m/s with increasing the inclination as the number of blades decreases from 8 to 6 in helicopter at the conditions as shown in Figure 2(a &d). The minimum flitting speed may reach 270m/s in Figure 2(b). It means that this one will be easy to be controlled and low cost to be manufactured due to its biggest blades number of 8. Figure 2(e) shows that the maximum flitting speed may become 48m/s and minimum one may become 10m/s in the end of 13s with time while the adjacent one is 10m/s at this conditions. The main reason for low flitting speed is caused by the low blades radius R=6.7m and blades gravity m=130kg. In short, the acceleration of propulsion may decrease as the blades radiusˎ rotational speedˎ helicopter gravity and blades gravity decreases except that number of blades increase. Meantime, it will decrease when the inclination decreases as well. The acceleration of propulsion has cyclosymmetry structure with the time in total. The flitting speed may increase to 350m/s with increasing its time to 14s. The flitting speed is proportional to time generally. Both acceleration and speed may increase to 220m/s2 and 358m/s according to increasing the inclination to 13º in the end of 14s respectively.

Conclusions

The acceleration of propulsion may decrease the blades gravity decreases. This acceleration increases from 8m/s2 to 220m/s2 when the blade gravity increase from 370kg to 570kg at conditions of the blades radius 37mˎrotational speed 3,300r/m & helicopter 30tons. On the other side, with increasing inclinations from 4º to 13º it may increase too. The adjacent acceleration with these inclinations will attain near 2m/s2 and 10m/s2 at the same two conditions at the angle f =4º. The flitting speed may be proportional to increasing time when it increase from 310km/s to 350m/s with decreasing number of blades from 8 to 6. With increasing the inclinations it will increase at the angle f =4º in the end of 14s.

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