Difference Between Netting Placement And Stand Frames

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Netting Placement and Stand Frames

Specifications and Use

Netting Placement
There are four 190 foot long nets connected between the two stands. There are two on the sides oriented vertically and connected to the upright supports. These two nets are connected at the bottom just above the bases of the stands and stretch four and half feet up the upright supports (figure 4). Another net runs the length of the longer of the two angled beams and is 12.5 feet in length, while another runs the length of the shorter angled beam at 10.6 feet. There is netting attached to cover to the two triangular sections at the top of both stands (figure 5). The Main Stand has netting secured to the large rectangular gap between the two upright supports. The Roll
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The stands consists of a steel alloy frame mounted on a mobile base. The frame consists of two upright beams, four inch square hollow steel beams five feet in length. These uprights are respectively mounted on two six inch square hollow beams six feet in length. A pair of these beams form the base of the stand, and each base is mounted on casters.

The two uprights are connected at their tops by a one inch square hollow crossbeam 19.5 feet in length. At the middle of the crossbeam is one inch square hollow upright beam 4.43 feet in length. At the top of this upright there is a 25 degree angle of depression cut from the right side to the left. On the left side of the crossbeam there is an identical cut. A one inch square hollow beam goes between the two slanted cuts at a length of 12.5 feet. On the right side of the crossbeam there is 20º angle of depression cut. Connecting to this cut is a 10.6 foot long one inch square hollow beam angled to the upright on top of the crossbeam. It connects to the upright 4.1 feet above the crossbeam (Appendix X: Bill of Materials). The design of the frame is so specific in order to minimize gaps between the swaths of netting, while still accommodating for the net fold up process. When folded up the nets expand in width, equal to their amplitude. The
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The dimensions of the lower rectangle of the frame were determined through performance testing and research to understand typical car dimensions (Appendix X: Performance Testing, Appendix X: Background Research Summary). There is extra buffer space built in to allow for nets to sag and to move in when hail impacts it without harming the underneath vehicles. The top half was designed to allow for the nets to compact and expand without interfering with each other, minimize gaps in the netting, and create angled nets to prevent material accumulation on the nets. The overhang on the sides allows for some net sagging and the net compaction process while minimizing gaps in the netting (figure 6).

Figure 6: Zoomed rendering of frame overhang to minimize gaps in the netting.

Wheels

Figure 7: The final design casters are air ride tires to allow for easy roll out.

Specifications and Use
There are a total of eight wheels per device - four on the Main Stand and four on the Roll Out Stand. Each wheel has a diameter of six inches, and is omnidirectional. The wheels are steel plate casters with air ride tires (Figure 7).

Rationale
There are four wheels for stability - one on each corner of the base on each stand. The size and material of both the wheels and casters is to accommodate the considerable weight of the structure they will be supporting.

Cable Crank

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