Gotowa bibliografia na temat „Chopper bicycle”

Pengujian impak standar pada helmet sepeda diperlukan untuk mengetahui respon tegangan pada helmet akibat efek rambatan gelombang regangan dengan laju rambatan gelombang yang tinggi. Tujuan dari penelitian ini adalah untuk mengetahui berapa besar energi yang dapat diserap oleh helmet sepeda bila diberi beban impak. Penelitian dilakukan terhadap helmet sepeda type BMX dengan formasi saluran udara (wind channel) tertentu yang terbuat dari material polymeric foam diperkuat serbuk tandan kosong kelapa sawit (TKKS) mesh40. Struktur geometri helmet uji terdiri dari lapisan luar (shell) terbuat dari material matrix resin unsaturated Polyester BQTN-157EX dan penguat serat glass chopped strand mat 300. Lapisan dalam (liner) adalah material polymeric foam menggunakan matrix resin unsaturated Polyester BQTN-157EX, penguat serbuk TKKS mesh40, Blowing AgentPolyurethane dan katalis Methyl Ethyl Keton Peroksida (MEKPO). Nilai dari sifat mekanik polymeric foam adalah tegangan tarik (σt) 1,17 MPa, tegangan tekan (σc) 0,51 MPa, tegangan bending (σb) 3,94 MPa, modulus elastisitas (E) 37,97 Mpa dan density (ρ) 193 (kg/m3). Metode impak yang dilakukan adalah jatuh bebas standar Consumer Product Safety Commision (CPSC). Helmet sepeda yang diuji adalah hasil dari desain standar Bicycle Helmet Safety Institute (BHSI) yang mempunyai dimensi panjang 264 mm, lebar 184 mm, dan tinggi 154 mm dengan lingkar kepala 580 mm. Massa test rig pada alat uji yang digunakan sebesar 5 kg dan massa helmet sepeda hasil cetakan bervariasi 328 s/d 451gr. Pengujian impak jatuh bebas dilakukan pada 18 sampel helmet ketebalan 10 mm dan 20 mm pada ketinggian 1,5 m dengan menggunakan flat anvil. Hasil uji impak pada parameter Gaya impak terbesar (Fi ), Energi Impak terbesar (Ei), Impuls (I), Tegangan Impak terbesar (σi) adalah 241,55 N, 283,77 J, 6,28 Ns, 2,02 MPa untuk tebal 10 mm dan 226,80 N, 360,23 J, 6,80 Ns, 1,90 MPa untuk tebal 20 mm. Standard impact testing on bicycle helmets is needed to determine the response on the helmet voltage due to the effect of strain wave propagation with a high a rate of wave propagation. The purpose of this reseach is to find out how much energy can be absorbed by the bicycle helmet if it is given an impact load. The reseach was conducted on BMX type bicycle helmet with a certain wind channels formation made of polymeric foam material strengthened by the powder of oil palm empty bunches (TKKS) mesh40. The geometry structure of the tested helmet consists of a shell made by the material of unsaturated Polyester BQTN-157EX resin and the fiber strengthener of glass chopped strand mat 300. The inner layer (liner) is a polymeric foam material using unsaturated Polyester BQTN-157EX resin matrix, TKKS powder strengthener Mesh40, Blowing Agent Polyurethane and catalyst Methyl Ethyl Ketone Peroxide (MEKPO). The characterizatons of the polymeric foam mechanical are tensile stress (σt) 1.17 MPa, compression stress (σc) 0.51 MPa, bending stress (σb) 3.94 MPa, elastic modulus (E) 37.97 Mpa and density (ρ ) 193 (kg / m3). The impact method was using the standard free fall of the Consumer Product Safety Commission (CPSC). The bicycle helmet tested is the result of the standard Bicycle Helmet Safety Institute (BHSI) design that has dimensions of 264 mm in length, 184 mm in width, and 154 mm in height with a head circumference of 580 mm. The mass of the test rig on the test equipment used was 5 kg and the helmet mass of the printed bicycle varied from 328 to 451gr. The free fall impact test was carried out on 18 helmet samples thickness of 10 mm and 20 mm at an altitude of 1.5 m using anvil flat. The impact test results in the parameters of the largest impact force (Fi), the largest impact energy (Ei), Impuls (I), the largest impact voltage (σi) are 241.55 N, 283.77 J, 6.28 Ns, 2.02 MPa for 10 mm and 226.80 N thickness, 360.23 J, 6.80 Ns, 1.90 MPa for 20 mm thickness.

This article presents two similar design cases and a discussion of how like values resulted in dissimilar design moves. Both cases were gamified learning activities for graduate students in instructional design. Both interventions employed rapid prototyping and were delivered synchronously in an at-a-distance setting. This article compares the two designs, the two designs’ similar development narratives, and the two designs’ divergent features. We give special attention to the common values the designers brought to the act of designing. Contrasting crucial features in similar designs allowed us, as designers, to appreciate divergent design moves. A discussion of the two cases explains how designers arrived at different design decisions through similar rationale. The authors were both designers and instructors of the implementations; each presents their case in relation to the other. Our combined cases explore how designers might compare salient features of similar instructional interventions and appreciate design moves that one chose not to make.

It's 1901 and a guy named Harley has an idea. Put an engine on a bicycle. What? Outside his door, carts are still pulled by horses and autos are a rare sight, for goodness' sake. It's 1908 and a Harley-Davidson motorcycle sets a record by getting 188 miles to a gallon of gas. It's 1909 and the company introduces something new to its line: a V-Twin cylinder engine. Fast forward to the twenty-first century, and the technical innovation hasn't stopped. But there's a lot more than just choppers in the mix. Examples: The Harley-Davidson racing team adds a seventeen-year-old girl to the roster. 250,000 people help celebrate Harley's 100th anniversary in Milwaukee, Wisconsin. And a museum devoted to the company's products opens up. Clearly, this is a company unlike any other. How did Harley do it? How did it go from making motorcycles to creating a Harley experience that puts hundreds of thousands of people aged sixteen to one hundred on the road traveling to events each year where they can meet company officials and other Harley riders? That's what this book is all about. Honda may match Harley-Davidson for quality and perhaps innovation, but no one has matched the company for its ability to create 'buzz marketing' and turn casual riders into unofficial sales people. Harley-Davidson, it turns out, isn't just in the motorcycle business. As its mission statement points out, it's in the business of fulfilling dreams. As author Missy Scott shows, Harley-Davidson is a rare company in other ways: Its loyal workforce, for one thing, is guided by principles like trust and respect for the individual. For another, the company has made a superb effort to keep jobs in the U.S., when it would be far cheaper and easier to use offshore labor. Teetering on the brink of bankruptcy in the early 1980s, Harley has roared back to capture the hearts of riders the world over, including the million-plus members of the Harley Owners Group (members are known, naturally, as HOGs). This book: -Explains the importance of the company and the essential disruptions that changed business forever. -Details Harley's origins and history. -Presents biographies of the founders and the historical context in which they launched the company. -Explains Harley's strategies and innovations. -Assesses Harley's impact on society, technology, processes, and work methods. -Details financial results over the years. -Predicts Harley's future prospects and successes. In addition, Scott offers special features that include a look at the colorful people associated with Harley, interesting trivia, a Harley-Davidson time line, a focus on products, a look at how the company treats its workers, what its detractors have to say, and where the company is headed. Harley-Davidson—a company that changed, and is changing, the world.