Have you ever heard of the curse of the bun? It is a peculiar and fascinating tale that dates back to ancient times. Legend has it that a small village was once plagued by a terrible curse that caused the townspeople to be forever hungry. No matter how much they ate, they would always feel famished, as if their stomachs were bottomless pits. In their desperation, the villagers sought the help of a wise old woman who was known for her magical abilities. She listened to their plight and decided to cast a spell to rid them of their curse. After performing a complex ritual, she created a special bun infused with her powerful magic.
After performing a complex ritual, she created a special bun infused with her powerful magic. The villagers were instructed to eat the bun together, believing that it would break the curse. As they took their first bite, a wave of relief washed over them.
RUNE - Reusable and Non-Explosive Actuator for Hold Down and Release Mechanisms
The project aims to develop, build and test a fully-reusable non-explosive actuator for hold-down and release mechanism, with a preload capacity of 10 kN. The Engineering Model has been built with representative materials and processes, and tested in representative conditions, corresponding to TRL5.
The project focused both on the release actuator and preload assembly, providing a generic actuator design that can be implemented for different platforms and applications.
The scope of activities for the RUNE mechanism is performed under a joint EM/QM approach. The mechanism is developed as a qualification model (QM) up to CDR, while the production, assembly and testing are carried on an engineering model (EM).
ChallengesFour critical parameters for the development of the mechanism are identified:
Reliability, self-generated release shock, reusability and release time (repeatability and simultaneity). These parameters guide the development of RUNE. From the start of the project, three features are identified as highly desirable: ultra-low self-generated shock and reusability.
Also of concern during the development process was the need to avoid any pre-existing intellectual property rights. A large number of existing patents in the field has been analysed in order to steer the development process away from previously patented concepts, and ensure patentability of the present concept. This adds additional constraints on the design space to an ambitious fast-acting ultra-low-shock reusable design.
BenefitsRUNE is a fast-acting, fully re-usable, ultra-low shock HDRM, enabling a discrete point separation.
Self-generated release shock
HDRM are characterized with respect to their self-generated Shock Response Spectrum (SRS) peak: RUNE releases Ultra-Low Shock ( during its operation.
Re-usability & Resettability
Assembly, Integration and test (AIT) procedures require multiple HDRM releases, and are greatly simplified when re-usable HDRM are employed. The re-usability of an HDRM is thus a key feature with respect to its implementation in space systems. RUNE is fully reusable (i.e., resettable); Furthermore, its operation requires access from only one side of the mechanism (the HDPA bolt side, the same side used to torque the HDPA bolt).
Release Time (Repeatability & Simultaneity)
Time-critical releases and multi point simultaneous releases require reliable and repeatable releases, with minimal scattering (dispersion) of individual release times, even for HDRMs at different temperature. RUNE is a fast-acting mechanism with low actuation time scatter.
FeaturesRUNE releases Ultra-Low Shock during its operation:
- The Shock Response Spectrum (SRS) peaks are below 50g for axial, horizontal and vertical directions, during a 10 kN preload release.
RUNE is easy to use:
- The mechanism is fully reusable (i.e., resettable). The mechanism reset operation is performed by one operator in less than a minute.
RUNE is a fast-acting mechanism with low actuation time scatter:
- The initiation time is between 10 ms and 60 ms (depending on initiation current and the extremes of the operational temperature range: +85 ºC / -50 ºC)
- The total actuation time is between 55 ms and 180 ms (depending on initiation current and the extremes of the operational temperature range: +85 ºC / -50 ºC)
- At ambient conditions the mechanism’s total actuation time is on average 105 ms, with a maximum measured scatter of 17 ms.
RUNE uses standard pyrotechnic electric signals (26V-40V, 4.1A 30ms pulse nominal). Its dimensions are approximately 42mm diameter per 40mm height, and it weighs 208g.
System ArchitectureThe RUNE mechanism is a discrete point separation device of generic type, i.e. independent from any specific application. Its design is scalable in order to widen as much as possible the range of potential applications and preloads.
RUNE’s functionality is provided by five basic elements:
Force
Magnitude
Elements
Description
Initiator
Converts electrical energy from the release actuation pulse into mechanical energy usable by the latch elements.
Latch
Maintains the HDRA in the secured configuration; up to reception of the release actuation signal by the Initiator.
Force
Reduction
Effective force reduction elements are crucial for reliable synchronous ultra-low shock HDRA designs. These provide the necessary leverage and load-uncoupling, between the high forces present at the hold-down preload assembly (HDPA) and the coupling elements, down to the low-energy initiator at the latch.
Preload
Relief
Mechanical elements that reduce the HDPA preload immediately before releasing the HDPA bolt member. This feature is not effective in all existing HDRA, but RUNE includes it in its design in order to reduce the self-generated shock during release.
Coupling
Mechanical elements that interface and secure the HDPA bolt, or an adaptor on the HDPA.
The force reduction elements form the backbone of RUNE, and are based in Euler (capstan) friction provided by a cable which wraps around a cylindrical body while constraining the coupling elements. In conjunction with the used coupling elements, this provides the required load uncoupling and provides a very effective preload relief function.
The high force reduction achieved enables the use of low mass and volume SMA initiator, while maintaining the electrical requirements of existing pyro lines (current, voltage and pulse times).
PlanAll the planned milestones of the project are completed: Preliminary design review (PDR), detailed design review (DDR), test readiness review (TRR) and the post-test review (PTR).
The scope of activities for the RUNE mechanism is performed under a joint EM/QM approach. The mechanism is developed as a qualification model (QM) up to DDR, while the production, assembly and testing are carried on an engineering model (EM).
As part of the activity’s initially planned tasks, an implementation plan is defined, laying forth the future activities required for the completion of:
- Successful qualification testing of a QM.
- Development up to a commercially available product and the delivery of a FM
A QM/EM RUNE mechanism has been designed, manufactured and tested in representative conditions. The mechanism is developed as a qualification model (QM) up to DDR, and the production, assembly and testing are carried on an engineering model (EM).
The mechanism was designed, produced and assembled, and performed successfully in all the planned tests.
Tiwaz is the rune of success when things are right and just. the arrow points to the strong focus that’s needed to reach your success. Concentrate positive energy in one direction.
Their hunger vanished, and they felt satisfied for the first time in ages. The curse had been lifted, or so they thought. However, the old woman had warned them that the magic of the bun would come at a price. They would be forever bound to it, unable to eat anything else for the rest of their lives. At first, this did not seem like a big sacrifice considering the alternative of constant hunger. But as time went on, the villagers began to realize the true curse of the bun. They soon grew tired of the limited diet, craving the variety of flavors they had once enjoyed. They missed the pleasures of tasting different foods and exploring new culinary experiences. The bun became a monotonous and unsatisfying staple of their lives. Attempts were made to break the curse, but nothing worked. The villagers were stuck in an endless cycle of eating the bun and longing for more. They became known as the cursed ones, a title that followed them throughout the years. Today, the curse of the bun serves as a cautionary tale about the consequences of seeking quick and easy solutions to our problems. It reminds us to be careful what we wish for and to consider the long-term effects of our actions. The villagers in the tale learned the hard way that sometimes the price of a seemingly magical solution can be too high to bear. So next time you find yourself in a difficult situation, remember the curse of the bun. Take a moment to reflect on the possible consequences of your choices and make sure that the solution you seek is truly worth the sacrifice..
Reviews for "The Haunted Hairstyle: Unmasking the Curse of the Bun"
1. John - 2 stars - I was really disappointed with "Curse of the bun". The plot was weak and confusing, and the acting felt forced and unnatural. It seemed like the filmmakers were trying too hard to be funny, but it fell flat. I found myself constantly checking my watch, waiting for the movie to be over. Overall, I would not recommend this film.
2. Sarah - 1 star - "Curse of the bun" was a complete waste of time. The storyline was unoriginal and predictable, and the characters were one-dimensional and uninteresting. The humor was juvenile and not at all funny. On top of that, the special effects were poorly done and looked cheap. I regret spending my money on this film and would advise others to avoid it.
3. Chris - 2 stars - I had high hopes for "Curse of the bun", but it ended up being a letdown. The plot had potential, but the execution was messy and confusing. The dialogue was cringe-worthy, and the acting was subpar. I found it difficult to connect with any of the characters, and the supposed scares fell flat. Overall, this film lacked the thrills and entertainment I was expecting.
4. Emily - 2.5 stars - "Curse of the bun" had its moments, but overall, it was a forgettable film. The story had potential, but it was dragged out and lacked originality. The characters were clichéd, and the acting was mediocre. The comedy felt forced and failed to elicit any laughs. The movie had its fair share of jump scares, but they were predictable and didn't leave a lasting impact. While it wasn't the worst film I've seen, I wouldn't recommend it to others.